OPA2277UA: Technical Guide to Texas Instruments' Precision Operational Amplifier

Introduction

Are you designing precision instrumentation, high-accuracy sensor interfaces, or critical analog signal conditioning circuits requiring ultra-low offset voltage and drift? The OPA2277UA represents Texas Instruments' proven solution for applications demanding exceptional DC precision, delivering industry-leading offset performance in a dual operational amplifier configuration optimized for precision measurement and instrumentation systems.

The OPA2277UA is a dual precision operational amplifier manufactured by Texas Instruments, a global leader in analog and mixed-signal semiconductors. This device features ultra-low offset voltage (10 μV typical), near-zero offset drift (0.1 μV/°C typical), and low noise performance in a space-efficient dual-amplifier package. Designed for applications where DC accuracy is paramount, it excels in precision instrumentation amplifiers, high-resolution data acquisition systems, strain gauge interfaces, thermocouple amplifiers, and critical sensor conditioning circuits requiring long-term stability and accuracy.

According to industry analysis, precision analog design continues to drive innovation in industrial automation, medical instrumentation, and scientific equipment where measurement accuracy directly impacts system performance and regulatory compliance. The OPA2277UA addresses these demands by providing laboratory-grade precision in production-ready integrated circuits, enabling engineers to achieve professional measurement accuracy without custom discrete designs or expensive chopper-stabilized amplifiers.

In this comprehensive technical guide, you'll discover the OPA2277UA's architecture, complete electrical specifications, performance analysis, proven application circuits, PCB design best practices, and competitive positioning to support informed component selection for precision analog designs requiring exceptional DC accuracy and long-term stability.

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OPA2277UA Technical Overview

The OPA2277UA is a dual precision operational amplifier that combines ultra-low offset voltage with excellent drift characteristics in a standard 8-pin SOIC package, providing exceptional DC accuracy for critical measurement applications.

Core Specifications Summary

Parameter	Specification	Significance
Configuration	Dual op-amp	Two amplifiers per package
Offset Voltage	10 μV typ, 25 μV max	Ultra-low DC error
Offset Drift	0.1 μV/°C typ	Excellent temperature stability
Input Bias Current	0.2 nA typ	Minimal input loading
Voltage Noise	0.35 μVp-p (0.1-10 Hz)	Low 1/f noise
CMRR	120 dB typ	Excellent common-mode rejection
Gain Bandwidth	1 MHz	Adequate for precision DC/low-frequency
Supply Voltage	±2.5V to ±18V	Flexible power options
Package	SOIC-8	Standard surface-mount

Key Performance Advantages

Ultra-Low Offset Voltage:

• 10 μV typical (25 μV maximum)
• Enables high-accuracy measurements without trimming
• Critical for sensor interfaces and instrumentation

Exceptional Offset Drift:

• 0.1 μV/°C typical (0.2 μV/°C maximum)
• Maintains accuracy over temperature
• Reduces system calibration requirements

Low Input Bias Current:

• 0.2 nA typical (low temperature)
• Minimal error with high-impedance sources
• Ideal for sensor interfaces (thermocouples, RTDs)

Part Number Decoder

Understanding Texas Instruments nomenclature:

OPA2277UA breakdown:

• OPA = Operational amplifier
• 2 = Dual amplifier (two per package)
• 277 = Specific model series
• U = Package type (SOIC-8)
• A = Grade designation

Related Variants:

• OPA277 = Single amplifier version
• OPA2277P = DIP-8 package
• OPA2277UA/2K5 = Tape-and-reel packaging

Target Applications

The OPA2277UA excels in precision measurement applications:

Instrumentation:

• Precision instrumentation amplifiers
• Bridge amplifiers (Wheatstone, strain gauge)
• High-resolution data acquisition
• Test and measurement equipment

Sensor Interfaces:

• Thermocouple amplifiers
• RTD (Resistance Temperature Detector) interfaces
• Pressure sensor conditioning
• Load cell amplifiers

Industrial:

• Process control systems
• Factory automation sensors
• Precision current-to-voltage converters
• Reference voltage buffers

Medical:

• Biomedical instrumentation
• Patient monitoring equipment
• Laboratory analyzers
• Diagnostic equipment

Scientific:

• Laboratory instruments
• Precision measurement systems
• Chromatography equipment
• Spectroscopy systems

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Precision Op-Amp Architecture

Understanding precision op-amp architecture reveals how the OPA2277UA achieves its exceptional DC performance through advanced design techniques.

Offset Voltage Sources and Reduction

Offset Voltage Origins:

In standard op-amps, offset voltage arises from:

• Input stage mismatch: Differential pair transistor variations
• Load mismatch: Unbalanced current mirror loading
• Packaging stress: Die attach and molding compound stress

OPA2277UA Offset Reduction Techniques:

┌──────────────────────────────────────────────┐
│    OPA2277UA Offset Reduction Architecture   │
├──────────────────────────────────────────────┤
│                                               │
│  ┌────────────────────────────────────────┐  │
│  │   Laser-Trimmed Input Stage            │  │
│  │   - Precision matching                 │  │
│  │   - Active trimming during mfg         │  │
│  │   → Achieves 10 μV typical offset      │  │
│  └────────────┬───────────────────────────┘  │
│               │                               │
│  ┌────────────▼───────────────────────────┐  │
│  │   Temperature Compensation             │  │
│  │   - Matched transistor pairs           │  │
│  │   - Thermal balancing                  │  │
│  │   → 0.1 μV/°C drift performance        │  │
│  └────────────┬───────────────────────────┘  │
│               │                               │
│  ┌────────────▼───────────────────────────┐  │
│  │   Low-Stress Packaging                 │  │
│  │   - Stress-relief die attach           │  │
│  │   - Controlled molding                 │  │
│  │   → Long-term offset stability         │  │
│  └────────────────────────────────────────┘  │
│                                               │
└──────────────────────────────────────────────┘

Laser Trimming:

• Factory trimming of on-chip resistors
• Nulls initial offset to 10 μV typical
• Permanent adjustment (not affected by temperature cycling)

Input Stage Design

Bipolar Input Transistors:

• PNP input pair for low input bias current
• Matched geometry for minimal offset
• Large emitter area for low noise

Benefits of Bipolar Design:

• Lower voltage noise than JFET (important for low-impedance sources)
• Lower offset than CMOS
• Stable over temperature

Internal Compensation

Frequency Compensation:

• Internally compensated for unity-gain stability
• 1 MHz gain-bandwidth product
• 45° phase margin (typical)

Trade-off:

• Lower bandwidth than general-purpose op-amps
• Optimized for DC and low-frequency precision
• Adequate for sensor interfaces (typically <10 kHz)

Common-Mode and Power Supply Rejection

CMRR (Common-Mode Rejection Ratio):

• 120 dB typical at DC
• Excellent rejection of common-mode noise
• Critical for instrumentation applications

PSRR (Power Supply Rejection Ratio):

• 120 dB typical at DC
• Minimizes power supply noise impact
• Enables use with less-regulated supplies

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Complete Technical Specifications

Let's examine the detailed specifications defining the OPA2277UA's performance and operational parameters.

DC Electrical Specifications

Parameter	Conditions	Typical	Maximum	Units
Offset Voltage (VOS)	TA = 25°C	10	25	μV
Offset Drift (ΔVOS/ΔT)	Full temperature	0.1	0.2	μV/°C
Input Bias Current (IB)	TA = 25°C	0.2	2	nA
Input Offset Current (IOS)	TA = 25°C	0.1	1	nA
Open-Loop Gain (AOL)	VO = ±10V, RL = 2kΩ	120	110	dB
CMRR	VCM = ±10V	120	110	dB
PSRR	VS = ±2.5V to ±18V	120	110	dB

Key Specification Analysis:

Offset Voltage:

• 10 μV typical = 0.00001V error
• For 0-10V signal: 0.0001% error (1 ppm)
• Industry-leading for integrated op-amps

Offset Drift:

• 0.1 μV/°C × 50°C range = 5 μV total drift
• Maintains sub-10 μV accuracy over temperature
• Critical for outdoor/industrial applications

AC Specifications

Parameter	Conditions	Typical	Units
Gain Bandwidth (GBW)	G = 1	1	MHz
Slew Rate	VO = ±10V	0.8	V/μs
Settling Time	To 0.01%, 10V step	15	μs
Voltage Noise (0.1-10 Hz)	-	0.35	μVp-p
Voltage Noise Density	f = 10 Hz	18	nV/√Hz
Current Noise Density	f = 10 Hz	0.2	pA/√Hz

AC Performance Notes:

Gain Bandwidth:

• 1 MHz suitable for DC to ~10 kHz signals
• Not for high-speed applications
• Optimized for precision, not speed

Noise Performance:

• 0.35 μVp-p (0.1-10 Hz): Excellent low-frequency noise
• 18 nV/√Hz @ 10 Hz: Low 1/f noise corner
• Suitable for precision measurements

Input/Output Specifications

Parameter	Conditions	Typical	Units
Input Voltage Range	Linear operation	(VS-) - 1.5V to (VS+) - 2.5V	V
Common-Mode Range	CMRR > 100 dB	(VS-) to (VS+) - 2V	V
Output Swing	RL = 2kΩ	(VS-) + 0.5V to (VS+) - 0.5V	V
Output Current	Short circuit	±25	mA

Operating Range:

• Supply voltage: ±2.5V to ±18V (flexible)
• Single supply: 5V to 36V (when configured for single supply)
• Input common-mode: Rail-to-rail minus ~2V headroom

Power Supply Specifications

Parameter	Conditions	Typical	Maximum	Units
Supply Voltage	Dual supply	±2.5 to ±18	-	V
Supply Current (per amplifier)	Quiescent, no load	1.8	2.5	mA
Power Dissipation	TA = 25°C	-	500	mW

Power Consumption:

• 3.6 mA typical for dual amplifier (1.8 mA × 2)
• Low power: Suitable for battery-powered applications
• 65 mW @ ±18V typical quiescent power

Temperature Specifications

Parameter	Value	Units
Operating Temperature	-40 to +125	°C
Storage Temperature	-65 to +150	°C
Thermal Resistance (θJA)	150	°C/W

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Performance Characteristics

How does the OPA2277UA perform in real-world precision applications? Let's examine key performance aspects and design considerations.

Offset Voltage Performance

Statistical Distribution:

For a typical production lot:

• Mean offset: ~10 μV
• Standard deviation: ~5 μV
• 99% within: ±20 μV
• Maximum spec: 25 μV (guaranteed)

Temperature Performance:

Offset Voltage vs Temperature:

μV
30 |                    ┌─────────  Max spec (25 μV initial)
   |               ┌────┤
25 |          ┌────┘    │
   |      ┌───┘         │         Slope = 0.2 μV/°C max
20 |  ┌───┘             │
   |┌─┘                 │
15 |│                   └─────────  Typical drift
   |│    Slope = 0.1 μV/°C typ
10 |└────────────────────────────  Initial offset (typical)
   |
 5 |
   |
 0 |─────┬─────┬─────┬─────┬─────
   -40  -20    0    25   50   85  125  °C

Key Insight: Even with maximum drift (0.2 μV/°C), total offset over -40°C to +125°C = 25 μV + (165°C × 0.2 μV/°C) = 58 μV maximum

Noise Performance

Voltage Noise:

Frequency Range	Noise Level	Impact
0.1-10 Hz	0.35 μVp-p	Low 1/f noise (flicker)
10 Hz	18 nV/√Hz	Noise density
1 kHz	12 nV/√Hz	Broadband noise

Total Noise Calculation:

For a 1 kHz bandwidth measurement:

Noise_RMS = √(Bandwidth) × Noise_density
          = √(1000 Hz) × 12 nV/√Hz
          = 380 nV RMS
          ≈ 1.1 μVp-p (3σ)

Noise Comparison:

• OPA2277UA: 0.35 μVp-p (0.1-10 Hz) — Excellent
• General-purpose op-amp: 2-5 μVp-p — Moderate
• Chopper amp: 0.05-0.1 μVp-p — Superior (but slower)

Gain and Frequency Response

Open-Loop Gain:

Frequency	Gain	Phase
DC	120 dB (1,000,000×)	0°
10 Hz	120 dB	-5°
100 Hz	120 dB	-30°
1 kHz	100 dB	-60°
10 kHz	80 dB	-80°
100 kHz	60 dB	-85°
1 MHz	0 dB	-90°

Unity-Gain Bandwidth:

• 1 MHz (gain = 1)
• Phase margin: 45° typical
• Stable at unity gain

Common-Mode Rejection

CMRR vs Frequency:

CMRR Performance:

dB
120 |████████████████████─────────
    |                     ───────
110 |                            ───────
    |                                   ────
100 |                                       ────
    |                                           ───
 90 |                                              ──
    |─────┬──────┬──────┬──────┬──────┬──────┬────
     DC   10Hz  100Hz  1kHz  10kHz 100kHz  1MHz

Key Points:

• 120 dB @ DC: Rejects 1,000,000:1 common-mode signal
• 90 dB @ 1 kHz: Still excellent rejection at audio frequencies
• Critical for instrumentation amplifiers

Power Supply Rejection

PSRR Performance:

• 120 dB @ DC: Supply noise attenuated 1,000,000:1
• 80 dB @ 10 kHz: Still good rejection at higher frequencies

Practical Impact:

• 1V supply ripple → 1 μV output error (worst case)
• Enables use of simpler linear regulators
• Reduces need for ultra-low-noise supplies

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Application Circuits and Design Examples

Let's examine proven application circuits demonstrating the OPA2277UA in typical precision measurement scenarios.

1. Precision Instrumentation Amplifier

Three-Op-Amp Instrumentation Amplifier:

Classic 3-Op-Amp In-Amp Configuration:

         R1        R1
    ────╱╲╲╲────╱╲╲╲────
    │            │      │
    │   ┌────────┴──┐   │
Vin+│───┤+          │   │
    │   │  OPA2277  ├───┤
    └───┤-  (A1)    │   │
        └───────────┘   │
                        │    R3
                        ├───╱╲╲╲───┐
         R2             │           │
        ╱╲╲╲            │   ┌───────┴──┐
    ────────────────────┼───┤-         │
    │                   │   │  OPA277  ├──── Vout
    │   ┌───────────┐   └───┤+ (A3)    │
Vin-│───┤+          │       └──────────┘
    │   │  OPA2277  ├───────┘
    └───┤-  (A2)    │        R4
        └───────────┘       ╱╲╲╲
         R1        R1        GND
    ────╱╲╲╲────╱╲╲╲────

Gain = (1 + 2R1/R2) × (R4/R3)
CMRR = Limited by R3/R4 matching

Design Values:

• R1 = 10 kΩ (matched 0.1%)
• R2 = 1 kΩ (gain adjust)
• R3 = R4 = 10 kΩ (matched 0.01%)
• Gain: 20× (adjustable via R2)
• CMRR: >100 dB (with matched resistors)

Performance:

• Input offset: <20 μV (with matched op-amps)
• Drift: <0.3 μV/°C
• Bandwidth: ~50 kHz (at gain = 20)

2. Thermocouple Amplifier

Cold-Junction-Compensated Thermocouple Amplifier:

Thermocouple Interface:

                      R1 10kΩ
                     ╱╲╲╲
    ┌────────────────┤
    │                │
    │   ┌────────────┴─────┐
TC+ │───┤+ OPA2277         │
    │   │                  ├──── Vout
TC- │───┤- (Non-inverting) │
    │   └──────────────────┘
    │            R2 1kΩ
    └───────────╱╲╲╲──────GND
    
Cold Junction      (Gain ≈ 11)
Compensation:
LM35 temp sensor → ADC for software correction

Specifications:

• Type K thermocouple: 41 μV/°C sensitivity
• Gain: 11× (460 μV/°C at output)
• Resolution: 0.025°C (with 10 μV offset)
• Accuracy: ±1°C over -40°C to +125°C

Why OPA2277UA:

• Low offset critical for small thermocouple voltages
• Low drift maintains accuracy over temperature
• Low noise for stable readings

3. Bridge Amplifier (Strain Gauge)

Wheatstone Bridge with Differential Amplifier:

Strain Gauge Bridge Interface:

        +Vexc (5V)
          │
    ┌─────┼─────┐
    │     │     │
   R1    R2   R3,R4
  (Ref) (Ref) (Gauges)
    │     │     │
    │     │     │
    └──┬──┴──┬──┘
       │     │
       │     │      R5 100kΩ
       │     └─────╱╲╲╲────┐
       │                   │
       │     ┌─────────────┴──┐
       └─────┤+ OPA2277       │
             │                ├──── Vout
         ────┤- (Differential)│
             └────────────────┘
                    R6 1kΩ
                   ╱╲╲╲
                   GND

Gain = R5/R6 = 100
Bridge output: ~2 mV/V excitation
After amplification: 1V for full-scale strain

Performance:

• Bridge sensitivity: 2 mV/V typical
• Gain: 100× (adjustable)
• Resolution: ~1 microstrain (με)
• Offset error: <25 μV / 100 = 0.25 μV input-referred

4. High-Impedance Voltage Follower

Unity-Gain Buffer for High-Z Sources:

High-Impedance Buffer:

              ┌──────────────┐
Source ───────┤+ OPA2277     │
(High Z)      │              ├──── Vout
          ┌───┤- (Unity gain)│    (Low Z)
          │   └──────────────┘
          │            │
          └────────────┘
          
Input Bias: 0.2 nA → 0.2 mV error across 1 MΩ source

Applications:

• pH electrode buffers (>100 MΩ source)
• Photodiode amplifiers
• High-impedance sensors
• Reference voltage buffering

Advantage:

• 0.2 nA input bias → minimal loading
• 10 μV offset → accurate buffering
• Low drift → long-term stability

5. Precision Current-to-Voltage Converter

Transimpedance Amplifier:

I-to-V Converter (Transimpedance):

              Rf (1MΩ - 10MΩ)
         ┌────╱╲╲╲╲╲──────┐
         │                │
         │   ┌────────────┴──┐
Iin ─────┼───┤- OPA2277      │
         │   │               ├──── Vout = -Iin × Rf
        GND──┤+ (Inverting)  │
             └───────────────┘

For Rf = 1MΩ:
1 μA input → 1V output
1 nA input → 1 mV output

Performance:

• Input current range: 1 pA to 10 μA
• Offset current: 0.1 nA → 100 μV error (Rf = 1MΩ)
• Bandwidth: Limited by Rf and Cf (add feedback cap)

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PCB Design and Implementation Guidelines

How do you design PCB layouts and circuits to fully realize the OPA2277UA's precision performance? Let's examine best practices.

PCB Layout Guidelines

Critical Layout Principles:

OPA2277UA PCB Layout (Top View):

    [Power Supply Bypass]
        C1(0.1μF)
           │
    ┌──────┴──────┐
    │  VCC+  OUT1 │────→ Output 1
IN1+│───────────  │
IN1-│  OPA2277UA  │
    │  (8-pin)    │
IN2+│─────────    │
IN2-│    OUT2 GND │────→ Output 2
    └──────┬──────┘
           │
        C2(0.1μF)
     [Power Supply Bypass]

Key Layout Rules:
1. Guard rings around input pins
2. Minimize input trace length
3. Keep power traces wide and short
4. Ground plane under IC (avoid splits)

Guard Ring Technique:

Cross-Section View:

                  Guard Ring
                  (Grounded)
                      │
    ┌─────────────────┼─────────────────┐
    │  Top Layer      │                 │
    │  ────────   ────┼────   ──────── │
    │  IN+  IN-      │GND│    Signal   │
    ├─────────────────┴─────────────────┤
    │  Ground Plane (solid)             │
    └───────────────────────────────────┘

Purpose: Prevents leakage currents between input pins

Component Placement:

1. Input components: Place immediately adjacent to input pins
2. Feedback resistors: Keep traces short and symmetric
3. Bypass capacitors: Within 5mm of power pins
4. Output load: Can be remote (driven output)

Power Supply Design

Dual Supply Configuration:

Dual Supply with Low-Noise Regulators:

+15V ─┬─► LM317/LT1763 ─┬─► +Vs (OPA2277UA)
      │   (Low noise)   │
      │                 ├─ 10μF tantalum
      │                 └─ 0.1μF ceramic
      │
GND ──┼─────────────────┼─► GND (OPA2277UA)
      │                 
      │
-15V ─┴─► LM337/LT1964 ─┴─► -Vs (OPA2277UA)
          (Low noise)

Bypass: 10μF + 0.1μF at each supply pin

Single Supply Configuration:

For single-supply operation (5V-36V):

• Create virtual ground at Vsupply/2
• Use rail-to-rail input/output if signals near rails
• Consider that OPA2277UA needs ~2V headroom from rails

Noise Reduction Techniques

Minimizing External Noise:

Source	Mitigation	Impact
Power supply noise	Linear regulator + bypass caps	Reduce to <1 μV
Ground loops	Star grounding, single-point ground	Eliminate <10 μV offsets
Electromagnetic interference	Shielding, grounded planes	Reduce RF pickup
Thermal EMF	Isothermal design, copper traces	Reduce <0.5 μV/°C
Leakage currents	Guard rings, clean PCB	Reduce to <10 pA

Thermal EMF Reduction:

Thermocouple junctions form at dissimilar metal connections:

• Use copper PCB traces (avoid aluminum wire bonds at connectors)
• Keep input connections isothermal (same temperature)
• Use low-thermal-EMF sockets if socketing IC

Input Protection

ESD Protection Circuit:

Input Protection for Precision Op-Amp:

           D1 (BAV199)
    Vin ───┬──┤>├──┬─── +Vs
           │         │
           │ R1 1kΩ │
           ├─╱╲╲╲──┬┴─── IN+ (OPA2277UA)
           │       │
           ├──┤<├──┘
           │  D2
          GND

D1, D2: Low-leakage Schottky (e.g., BAV199)
R1: Series resistor limits fault current

Protection Considerations:

• Use low-leakage diodes (<1 nA leakage)
• Series resistor creates offset (0.2 nA × 1kΩ = 0.2 μV)
• Only use if ESD risk justifies added error

Testing and Calibration

Offset Voltage Measurement:

Offset Measurement Setup:

         ┌──────────────┐
    ┬────┤+ OPA2277     │
    │    │              ├──── Vout (measure with DMM)
    └────┤- (Unity gain)│
         └──────────────┘
         
Short inputs together, measure output
Voffset = Vout (should be <25 μV)

Drift Measurement:

• Measure offset at multiple temperatures (-40°C, 25°C, 85°C)
• Calculate: Drift = ΔVoffset / ΔT
• Should be <0.2 μV/°C maximum

---

Comparison with Alternative Op-Amps

How does the OPA2277UA compare to alternative precision operational amplifiers? Let's examine competitive options.

Precision Op-Amp Comparison

Parameter	OPA2277UA	OP07	LT1013	AD8551 (Chopper)
Offset Voltage	10 μV typ	25 μV typ	25 μV typ	1 μV max
Offset Drift	0.1 μV/°C typ	0.3 μV/°C typ	0.5 μV/°C typ	0.005 μV/°C typ
Input Bias	0.2 nA	1 nA	0.2 nA	0.01 pA
Noise (0.1-10Hz)	0.35 μVp-p	0.5 μVp-p	0.4 μVp-p	3.5 μVp-p
GBW	1 MHz	0.6 MHz	1 MHz	1.5 MHz
Config	Dual	Single	Dual	Single
Price (1K)	$$	$	$$	$$$

When to Choose OPA2277UA:

• ✅ Need dual op-amp configuration
• ✅ Balance of offset, drift, and noise performance
• ✅ Moderate bandwidth requirements (DC-10 kHz)
• ✅ Cost-sensitive compared to chopper amps
• ✅ Proven design with broad adoption

When Alternatives Better:

• OP07: Single-amp applications, lower cost acceptable
• AD8551 (chopper): Absolute best DC specs needed (medical, metrology)
• OPA227: Higher bandwidth required (100 kHz+)

Texas Instruments OPA Family

Model	Config	Offset	Drift	GBW	Key Difference
OPA177	Single	25 μV	0.2 μV/°C	600 kHz	Lower cost
OPA277	Single	10 μV	0.1 μV/°C	1 MHz	Single-channel OPA2277
OPA2277UA	Dual	10 μV	0.1 μV/°C	1 MHz	Best DC precision, dual
OPA227	Single	50 μV	0.4 μV/°C	8 MHz	Higher bandwidth
OPA2277P	Dual	10 μV	0.1 μV/°C	1 MHz	DIP package variant

Package Options:

• OPA2277UA: SOIC-8 (surface mount) — Most common
• OPA2277P: DIP-8 (through-hole) — Prototyping, legacy
• OPA2277UA/2K5: Tape-and-reel — Production volumes

Cost-Performance Trade-offs

Application	Recommended Op-Amp	Rationale
High-volume production	OPA2277UA	Best precision/cost for dual config
Ultimate DC precision	AD8551 (chopper)	Worth premium for metrology
Budget-constrained	OP07 (single) or LM358	Adequate for less-critical apps
High-speed precision	OPA227, AD8065	When >5 MHz bandwidth needed
Battery-powered	OPA2333 (CMOS)	Micropower consumption

TCO (Total Cost of Ownership):

• OPA2277UA: Moderate component cost, reduces system calibration costs
• OP07: Lower component cost, may require trimming/calibration
• Chopper amp: Higher component cost, eliminates calibration needs

Conclusion

The OPA2277UA represents Texas Instruments' proven precision operational amplifier solution, delivering exceptional DC accuracy through ultra-low offset voltage (10 μV typical), outstanding offset drift (0.1 μV/°C), and low noise performance in a dual-amplifier configuration. With comprehensive features including low input bias current, high CMRR/PSRR, and flexible power supply options, this device enables precision measurement and instrumentation applications requiring laboratory-grade accuracy without complex discrete designs or expensive alternatives.

Key Advantages:

✅ Ultra-Low Offset: 10 μV typical, 25 μV maximum (industry-leading)
✅ Exceptional Drift: 0.1 μV/°C maintains accuracy over temperature
✅ Dual Configuration: Two amplifiers per package (space-efficient)
✅ Low Noise: 0.35 μVp-p (0.1-10 Hz) for stable measurements
✅ High CMRR/PSRR: 120 dB rejection of common-mode and supply noise
✅ Proven Reliability: Decades of successful field deployment

For precision instrument designers, sensor interface engineers, or analog designers requiring exceptional DC performance in critical measurement applications, the OPA2277UA delivers professional-grade accuracy at competitive economics, enabling high-precision systems without custom calibration or complex compensation.

Designing precision circuits with OPA2277UA? Visit AiChipLink.com for technical resources, application notes, and expert consultation on precision analog design and component selection.

Achieve laboratory-grade measurement accuracy—the OPA2277UA delivers proven precision for demanding instrumentation applications.

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Written by Jack Elliott from AIChipLink.

 

AIChipLink, one of the fastest-growing global independent electronic   components distributors in the world, offers millions of products from thousands of manufacturers, and many of our in-stock parts is available to ship same day.

 

We mainly source and distribute integrated circuit (IC) products of brands such as Broadcom, Microchip, Texas Instruments, Infineon, NXP, Analog Devices, Qualcomm, Intel, etc., which are widely used in communication & network, telecom, industrial control, new energy and automotive electronics. 

 

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