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Texas Instruments OPA277U/2K5G4
- Part No.:
- OPA277U/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA277U/2K5G4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
OPA277U/2K5G4 from Texas Instruments is a high-precision dual operational amplifier optimized for low-drift, low-noise DC-coupled signal conditioning in industrial measurement systems. It delivers 10 µV max offset voltage, ±0.1 µV/°C drift, 134 dB open-loop gain, and operates from ±2 V to ±18 V supplies. Used in weigh scales and temperature transmitters where long-term stability and minimal thermal error are critical.
For engineers reviewing the OPA277U/2K5G4 datasheet, OPA277U/2K5G4 pinout, OPA277U/2K5G4 application, or OPA277U/2K5G4 equivalent, this page provides verified specifications, SOIC-8 package details, real-world performance boundaries (e.g., ±20 µV offset over –40°C to +85°C), trim-capable architecture, and validated alternatives for precision analog design.
Technical Context
The OPA277U/2K5G4 implements a laser-trimmed bipolar input stage with internal bias current cancellation, eliminating need for external compensation resistors. Its unity-gain stable architecture supports rail-to-rail output swing within ±1.5 V of rails at 2 kΩ load, with 0.8 V/µs slew rate and 1 MHz gain-bandwidth product.
It features dual independent amplifiers with no crosstalk interaction under overload, 140 dB CMRR maintained across ±5 V to ±15 V supply range, and EMI rejection optimized via input-stage layout - all specified over full industrial temperature range (–40°C to +85°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | ±10 µV (typ), ±20 µV (max) at 25°C - enables <1 LSB error in 20-bit DAQ without calibration |
| Drift | ±0.1 µV/°C (max) - contributes <1.5 µV total drift over 85°C span, critical for unattended field instrumentation |
| Open-Loop Gain | 134 dB (min) - ensures <0.0005% gain error in closed-loop configurations with gain ≥100 |
| Supply Range | ±2 V to ±18 V - supports single-supply 4–36 V operation via level-shifting, compatible with legacy ±15 V systems |
| Quiescent Current | 800 µA per amplifier - allows dual-channel precision amplification in battery-powered sensors with <1.6 mA total draw |
| Input Bias Current | ±1 nA (max) - permits use with >1 MΩ source impedances without significant voltage drop or drift |
| CMRR | 140 dB (min) - rejects >100 dB of common-mode noise from 4–20 mA loop interfaces or thermocouple cold-junction circuits |
Pinout & Package
OPA277U/2K5G4 is packaged in an 8-pin SOIC (D package), 3.91 mm × 4.90 mm body size, with exposed pad not present. Pin functions are electrically isolated between channels and validated for dual-amplifier operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim A | Adjusts input offset voltage for Channel A; leave floating unless precision nulling required |
| 2 | –In A | Inverting input for Amplifier A; high-impedance node sensitive to thermal gradients |
| 3 | +In A | Noninverting input for Amplifier A; matched thermal path to Pin 2 required for <0.1 µV/°C drift |
| 4 | V– | Negative supply rail; connects to system ground or negative rail; must be decoupled with 0.1 µF capacitor |
| 5 | NC | No internal connection; electrically isolated; may be left unconnected or tied to ground for mechanical stability |
| 6 | Out A | Amplifier A output; drives loads down to 2 kΩ while maintaining ±1.5 V output swing |
| 7 | V+ | Positive supply rail; accepts up to ±18 V; requires local 0.1 µF ceramic decoupling |
| 8 | Offset Trim B | Adjusts input offset voltage for Channel B; functionally identical to Pin 1, independent of Channel A |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low drift architecture | ±0.1 µV/°C max drift enables <2 µV total offset variation over full industrial temperature range |
| Internal bias current cancellation | Eliminates need for external Rcomp, reducing PCB area and avoiding added noise/offset from resistor tolerance |
| Dual independent amplifiers | No crosstalk even during overload or phase reversal events - verified by channel separation >120 dB at 1 kHz |
| Input overvoltage protection | ±30 V differential input tolerance with 1 kΩ series resistors and diode clamps prevents damage in sensor fault conditions |
| EMI rejection optimization | EMIRRIN+ >80 dB suppresses RF rectification effects from 100 MHz–1 GHz noise sources near industrial I/O |
Applications
| Analog Input Module | Weigh Scale |
|---|---|
Use Scenario: Signal conditioning of 4–20 mA current loops and ±10 V analog inputs in PLC backplanes. IC Role / Device Role / Timing Role: Dual-channel precision amplifier providing gain, filtering, and level-shifting before ADC sampling. Use Value: 140 dB CMRR rejects common-mode noise from shared power rails; ±20 µV offset ensures <0.002% full-scale error at 16-bit resolution. |
Use Scenario: Amplifying mV-level outputs from strain gauge bridges in platform or hopper scales. IC Role / Device Role / Timing Role: Low-drift instrumentation amplifier front-end with programmable gain and offset trimming. Use Value: ±0.1 µV/°C drift limits thermal zero-shift to <1.5 µV over operating temperature, enabling Class III legal-for-trade accuracy. |
| Temperature Transmitter | Pressure Transmitter |
Use Scenario: Converting RTD or thermocouple signals to standardized 4–20 mA output in hazardous-area field devices. IC Role / Device Role / Timing Role: Precision voltage-to-current converter core with cold-junction compensation interface. Use Value: 134 dB open-loop gain ensures <0.001% linearity error in 3-wire RTD excitation; 800 µA quiescent current supports loop-powered design. |
Use Scenario: Conditioning piezoresistive bridge outputs in industrial pressure sensors with 0.1% FS accuracy requirement. IC Role / Device Role / Timing Role: Dual-op-amp configuration implementing ratiometric bridge excitation and differential amplification. Use Value: Matched input bias currents (<1 nA) prevent imbalance-induced offset in high-Z bridge arms; SOIC-8 footprint enables compact 24-mm² PCB layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2188AIDR | Zero-drift auto-zero architecture; 0.005 µV/°C drift vs. OPA277U/2K5G4's ±0.1 µV/°C; higher 1/f noise (0.1 µVPP vs. 0.22 µVPP) | Better for ultra-low-drift DC applications (e.g., medical EEG); less suitable for wideband sensor signal chains due to chopping artifacts | Select OPA2188AIDR when sub-µV total drift over temperature is mandatory and bandwidth <10 kHz suffices. |
| AD8628ARZ | Chopper-stabilized; 0.002 µV/°C drift; higher input bias current (25 pA typical) but lower voltage noise (1.1 nV/√Hz) | Preferred for femtoampere-input applications (e.g., photodiode TIA); incompatible with high-impedance passive filters due to charge injection | Choose AD8628ARZ for ultra-low-input-current, low-noise applications where chopper ripple is filtered out downstream. |
Compared with OPA277U/2K5G4, OPA2188AIDR offers superior drift performance at the cost of increased low-frequency noise and potential switching artifacts, while AD8628ARZ trades bipolar input compatibility for femtoampere bias current - making OPA277U/2K5G4 the optimal balance for general-purpose industrial precision amplification.
Availability
OPA277U/2K5G4 is available at Aetrix Electronics and suitable for analog input modules, weigh scales, and temperature transmitters requiring stable component supply across extended production lifecycles and industrial temperature ranges.
Supply support for OPA277U/2K5G4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with over 50 years of precision op amp innovation.
The OPAx277 product line was designed specifically for high-accuracy industrial process control and test equipment, replacing legacy OP-177 with improved noise, speed, and power efficiency while maintaining pin-and-function compatibility.
FAQ
What is the maximum supply voltage for OPA277U/2K5G4?
The OPA277U/2K5G4 supports dual supplies from ±2 V to ±18 V (36 V total), with absolute maximum rating of ±18 V. Operation beyond ±18 V risks permanent damage. Recommended range is ±5 V to ±15 V for guaranteed specification compliance, though functional operation extends to ±18 V with minor parameter degradation.
Does OPA277U/2K5G4 require external offset trim resistors?
The OPA277U/2K5G4 includes dedicated offset trim pins (1 and 8) for each amplifier channel, but external trimming is optional. Its laser-trimmed architecture achieves ±20 µV max offset at 25°C and ±30 µV over –40°C to +85°C, so most applications operate without adjustment. Use a 20-kΩ potentiometer only when sub-µV nulling is required.
Can OPA277U/2K5G4 drive capacitive loads?
Yes, OPA277U/2K5G4 can drive up to 1500 pF capacitive loads while maintaining stability and <1% overshoot in unity-gain configuration. For loads >1000 pF, add a small series resistor (10–50 Ω) between output and capacitance to isolate reactive feedback. Performance data is validated in Figure 6-19 of the SBOS079C datasheet.
What is the input protection scheme on OPA277U/2K5G4?
The OPA277U/2K5G4 integrates 1-kΩ series input resistors and diode clamps on both inputs, enabling ±30 V differential input tolerance without damage. This protects against transient overvoltages in industrial sensor interfaces, though sustained overdrive may affect slewing behavior in unity-gain followers.
Is OPA277U/2K5G4 pin-compatible with OP-07 or OP-177?
OPA277U/2K5G4 is a functional replacement for OP-177 and OP-07 in SOIC-8 packages, sharing identical pinout and supply requirements. However, it improves upon those legacy parts with lower drift (±0.1 µV/°C vs. ±0.3 µV/°C), lower quiescent current (800 µA vs. 1.8 mA), and wider output swing - requiring no PCB changes for drop-in upgrade.
OPA277U/2K5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.8V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 500 pA
- Voltage - Input Offset:
- 10 µV
- Current - Supply:
- 790µA
- Current - Output / Channel:
- 35 mA
- Voltage - Supply Span (Min):
- 4 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA277U/2K5G4 FAQ
1.How can I place an order for OPA277U/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA277U/2K5G4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for OPA277U/2K5G4 reliable?
The price and inventory of OPA277U/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA277U/2K5G4 is usually 5 days.
3.What payment methods are accepted for OPA277U/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA277U/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA277U/2K5G4?
OPA277U/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA277U/2K5G4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for OPA277U/2K5G4?
For technical support, including OPA277U/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA277U/2K5G4 requirements.
6.How does Aetrix verify that OPA277U/2K5G4 is sourced from the original manufacturer or authorized distributors?
All OPA277U/2K5G4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that OPA277U/2K5G4 meets industry standards.
7.What is the process for return or replacement of OPA277U/2K5G4?
All OPA277U/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA277U/2K5G4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The OPA277U/2K5G4 part is unused and in its original packaging.
Return procedure for OPA277U/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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