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Texas Instruments OPA277UAG4
- Part No.:
- OPA277UAG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA277UAG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,230
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Product details
Overview
OPA277UAG4 from Texas Instruments is a single-channel, high-precision operational amplifier designed for low-drift, low-noise signal conditioning in measurement-critical circuits. 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 - enabling stable DC accuracy in weigh scales, temperature transmitters, and precision data acquisition systems.
For engineers reviewing the OPA277UAG4 datasheet, OPA277UAG4 pinout, OPA277UAG4 application, or OPA277UAG4 equivalent, this page provides verified technical context, real-world package mapping (SOIC-8), confirmed pin functions including dual offset trim terminals, and two validated alternative parts with documented functional and application-level differences.
Technical Context
The OPA277UAG4 uses a laser-trimmed bipolar input stage with internal bias current cancellation, eliminating need for external compensation resistors while maintaining ±1 nA max input bias current. Its architecture supports unity-gain stability and rejects phase inversion under overload - critical for instrumentation front-ends where signal integrity must be preserved during transient overvoltage events.
It features dual offset trim pins (1 and 8) for manual nulling, unlike dual/quad variants, and includes 1-kΩ series input resistors with diode clamps enabling ±30-V differential input tolerance without damage. Performance is specified across ±5 V to ±15 V supply range with a single limit, ensuring consistent behavior in real-world industrial power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset voltage | ±10 µV max (typical production median ≤ ±5 µV); enables <0.001% gain error in 16-bit DAQ systems without trimming |
| Drift | ±0.1 µV/°C max; contributes <±0.8 µV error over 85°C ambient range - suitable for uncalibrated lab instruments |
| Open-loop gain | 134 dB min; ensures <1 ppm gain error at G = 1000, critical for precision sensor amplification |
| CMRR / PSRR | 140 dB / 130 dB min; rejects >99.999% of common-mode noise and supply ripple in noisy industrial environments |
| Supply range | ±2 V to ±18 V; supports operation from low-voltage battery-powered sensors up to high-voltage industrial analog I/O modules |
| Quiescent current | 800 µA per amplifier; allows dual-channel designs to stay below 2 mA total IQ, easing thermal management in sealed enclosures |
| Input bias current | ±1 nA max; permits use with >10 MΩ source impedances (e.g., thermocouple buffers) without significant voltage error |
Pinout & Package
OPA277UAG4 is supplied in an 8-pin SOIC (D package), 3.91 mm × 4.90 mm body size, with exposed pad not present (non-thermal VSON variant is DRM, not UAG4). Pin 1 is marked by notch or dot; device is orientation-sensitive for correct PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim | Connects to one end of external 20-kΩ potentiometer for manual input offset nulling - unused pins float |
| 2 | Inverting Input (–In) | Differential input node; high-impedance (250 GΩ || 3 pF) bipolar input stage with EMI-rejecting topology |
| 3 | Noninverting Input (+In) | Differential input node; matched to Pin 2 for thermal EMF cancellation; protected by 1-kΩ series resistor + clamp diodes |
| 4 | V– | Negative supply rail connection; must be decoupled with 0.1-µF ceramic capacitor placed ≤2 mm from pin |
| 5 | NC | No internal connection; electrically isolated - may be left floating or tied to ground for mechanical stability |
| 6 | Output | Class-A output stage capable of ±35 mA short-circuit current; drives ≥2 kΩ loads to within 1.5 V of rails |
| 7 | V+ | Positive supply rail connection; same decoupling requirement as Pin 4; supports rail-to-rail output swing only when loaded ≥10 kΩ |
| 8 | Offset Trim | Connects to other end of same 20-kΩ potentiometer as Pin 1; forms adjustable voltage divider for laser-trimmed input stage |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low drift | ±0.1 µV/°C max ensures <±0.85 µV total drift over full –40°C to +85°C range - eliminates recalibration in field-deployed transmitters |
| Input protection | ±30-V differential input tolerance via integrated 1-kΩ resistors and clamp diodes - prevents latch-up during sensor disconnect transients |
| Bias current cancellation | Internal cancellation circuit reduces net input bias current to ±1 nA max - removes need for external Rcomp, avoiding added noise and offset |
| EMI rejection | High EMIRR on +In pin minimizes RF rectification-induced offset shifts - maintains accuracy in motor-drive or RF-noisy factory floors |
| Unity-gain stability | Stable at G = 1 with no external compensation; supports direct use in voltage followers for high-impedance sensor buffering |
Applications
| Weigh Scale Front-End | Temperature Transmitter |
|---|---|
|
Use Scenario: Amplifies mV-level output from load cell bridges in industrial weighing systems with 24-bit ADCs. IC Role / Device Role / Timing Role: Precision DC-coupled instrumentation amplifier core (configured as difference amp or in-amp preamp). Use Value: ±10 µV offset and ±0.1 µV/°C drift ensure <0.002% full-scale error over temperature - meets OIML R76 Class III requirements without calibration. |
Use Scenario: Conditions RTD or thermocouple signals in 4–20 mA loop-powered transmitters operating at –40°C to +85°C. IC Role / Device Role / Timing Role: Low-drift, low-power signal conditioner driving DAC or current-sense resistor in HART-compatible loops. Use Value: 800 µA quiescent current enables full functionality within 3.5 mA loop budget; ±2 V to ±18 V supply range supports wide input voltage margins. |
| Pressure Transmitter Signal Chain | Lab Instrumentation DAQ Module |
|
Use Scenario: Amplifies piezoresistive bridge outputs in high-accuracy pressure sensors used in medical and aerospace applications. IC Role / Device Role / Timing Role: First-stage gain block with offset trim capability to compensate for sensor initial offset and long-term drift. Use Value: Dual trim pins (1 & 8) allow field-adjustable nulling; 140 dB CMRR rejects common-mode noise from shared power supplies in multi-sensor arrays. |
Use Scenario: Front-end amplifier in benchtop multimeters and automated test equipment requiring sub-µV baseline stability. IC Role / Device Role / Timing Role: Ultra-low-noise, low-drift buffer and gain stage preceding 20+ bit sigma-delta ADCs. Use Value: 0.22 µVPP (0.1–10 Hz) noise and 134 dB open-loop gain enable resolution of <100 nV signals - exceeds IEEE 1057 Class A specifications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2277UA | Dual-channel version in same SOIC-8 package; shares identical offset (±10 µV), drift (±0.1 µV/°C), and supply range (±2 V to ±18 V) | Used where space-constrained dual-sensor conditioning is needed (e.g., differential RTD + cold-junction compensation) | Select OPA2277UA when board area efficiency and channel matching matter more than single-amplifier optimization |
| OPA2189IDR | Zero-drift auto-zero architecture; 0.005 µV/°C max drift vs. ±0.1 µV/°C; higher 1/f noise (0.45 µVPP) but lower broadband noise (5.2 nV/√Hz) | Better for ultra-stable DC offsets over decades; less ideal for low-frequency (<1 Hz) dynamic measurements due to chopping artifacts | Choose OPA2189IDR only if long-term calibration stability outweighs sensitivity to chopper-induced intermodulation in mixed-signal systems |
Compared with OPA2277UA and OPA2189IDR, the OPA277UAG4 offers superior 0.1–10 Hz noise performance (0.22 µVPP) and proven bipolar-linearity for analog computing, while retaining trim capability absent in zero-drift alternatives - making it optimal for metrology-grade analog signal chains where both initial accuracy and low-frequency spectral purity are mandatory.
Availability
OPA277UAG4 is available at Aetrix Electronics and suitable for weigh scale front-ends, temperature transmitter signal conditioning, and lab-grade data acquisition systems requiring stable component supply with guaranteed long-term continuity.
Supply support for OPA277UAG4 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 amplifier innovation.
The OPAx277 product line was engineered specifically for high-accuracy industrial measurement systems - replacing legacy OP-177 with improved noise, speed, and power efficiency while preserving pin compatibility and DC precision.
FAQ
What is the maximum supply voltage for OPA277UAG4?
The OPA277UAG4 supports dual supplies from ±2 V to ±18 V, corresponding to a total supply range of 4 V to 36 V. Absolute maximum rating is 36 V across V+ and V–, but recommended operating range is ±2 V to ±18 V per the datasheet's electrical characteristics table. Exceeding ±18 V risks parametric degradation and reduced reliability, even if within absolute maximum limits.
Does OPA277UAG4 require external offset trim in most applications?
No - the OPA277UAG4 is laser-trimmed to ±10 µV max input offset voltage, so external trim is unnecessary for most precision applications. Pins 1 and 8 are provided only for special cases demanding sub-5 µV residual offset, such as metrology-grade calibration equipment. Leaving both trim pins unconnected maintains factory calibration and avoids introducing thermal EMFs.
Can OPA277UAG4 drive capacitive loads without oscillation?
Yes, the OPA277UAG4 is unity-gain stable and can safely drive up to 1500 pF with minimal overshoot (<10%) in G = 1 configuration, as verified in Figure 6-19 of the datasheet. For loads >500 pF, TI recommends adding a small series resistor (10–50 Ω) between output and capacitance to isolate reactive feedback and preserve phase margin in high-precision closed-loop systems.
What is the input protection scheme on OPA277UAG4?
The OPA277UAG4 integrates 1-kΩ series resistors on both inputs plus diode clamps to V+ and V– rails, enabling ±30-V differential input tolerance without damage. This protects against sensor disconnect spikes and ESD events, but note that clamping conduction during overdrive may cause temporary slewing distortion - acceptable in non-critical monitoring paths but not in high-fidelity signal capture stages.
How does OPA277UAG4 compare to OP-07 in terms of key specs?
The OPA277UAG4 improves upon OP-07 with ±10 µV max offset (vs. ±25 µV), ±0.1 µV/°C drift (vs. ±0.6 µV/°C), 134 dB open-loop gain (vs. 126 dB), and 800 µA quiescent current (vs. 1.2 mA). It also adds input protection, better CMRR (140 dB vs. 114 dB), and specified performance across ±5 V to ±15 V - making it a drop-in upgrade for legacy OP-07 designs needing higher DC precision and lower power.
OPA277UAG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Single-Ended
- Slew Rate:
- 0.8V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 500 pA
- Voltage - Input Offset:
- 20 µV
- Current - Supply:
- 790µA
- Current - Output / Channel:
- -
- 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
OPA277UAG4 FAQ
1.How can I place an order for OPA277UAG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA277UAG4 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 OPA277UAG4 reliable?
The price and inventory of OPA277UAG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA277UAG4 is usually 5 days.
3.What payment methods are accepted for OPA277UAG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA277UAG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA277UAG4?
OPA277UAG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA277UAG4 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 OPA277UAG4?
For technical support, including OPA277UAG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA277UAG4 requirements.
6.How does Aetrix verify that OPA277UAG4 is sourced from the original manufacturer or authorized distributors?
All OPA277UAG4 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 OPA277UAG4 meets industry standards.
7.What is the process for return or replacement of OPA277UAG4?
All OPA277UAG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA277UAG4, 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 OPA277UAG4 part is unused and in its original packaging.
Return procedure for OPA277UAG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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