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Texas Instruments OPA277UAE4
- Part No.:
- OPA277UAE4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA277UAE4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,371
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Product details
Overview
OPA277UAE4 from Texas Instruments is a single-channel, high-precision operational amplifier designed for low-drift, low-noise signal conditioning in measurement front-ends. 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-coupled amplification in weigh scales and precision analog input modules.
For engineers reviewing the OPA277UAE4 datasheet, OPA277UAE4 pinout, OPA277UAE4 application, or OPA277UAE4 equivalent, this page provides verified specifications, SOIC-8 package details, trim-capable pin configuration, real-world thermal metrics, and validated alternatives for industrial instrumentation and battery-powered DAQ systems.
Technical Context
The OPA277UAE4 uses a laser-trimmed bipolar input stage with internal bias current cancellation, eliminating need for external compensation resistors. Its offset trim pins (1 and 8) support fine calibration without introducing additional drift - a feature absent in dual/quad variants.
It achieves unity-gain stability while maintaining 0.8 V/µs slew rate and 1 MHz gain-bandwidth product, with guaranteed performance across ±5 V to ±15 V supply range - not just at a single test voltage - and specified over –40°C to +85°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | ±10 µV (max at 25°C); enables <1 LSB error in 20-bit ADC systems without trimming |
| Drift | ±0.1 µV/°C (max); ensures <1 µV total drift over 50°C temperature span |
| Open-Loop Gain | 134 dB (min); supports >100 ppm closed-loop accuracy in high-gain configurations |
| CMRR / PSRR | 140 dB / 130 dB (min); rejects >100,000:1 common-mode and supply noise |
| Quiescent Current | 800 µA/amplifier (typ); allows dual-supply operation in battery-powered instruments for >1 year |
| Supply Range | ±2 V to ±18 V; supports wide-rail industrial sensors and legacy ±15 V systems |
| Input Noise | 0.22 µVPP (0.1–10 Hz); critical for sub-µV-level thermocouple and strain gauge amplification |
Pinout & Package
OPA277UAE4 is packaged 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 applicable here).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim | Connects to one end of 20-kΩ potentiometer for manual nulling; leave floating if unused |
| 2 | –In | Inverting input; high-impedance node requiring symmetrical layout and guarding |
| 3 | +In | Noninverting input; matched thermal mass required vs Pin 2 to minimize thermoelectric drift |
| 4 | V– | Negative supply rail; must be decoupled with 0.1 µF capacitor close to pin |
| 5 | NC | No internal connection; electrically isolated; may be left unconnected or grounded |
| 6 | Output | Capacitive load stable up to 1500 pF; drives 2 kΩ loads to within 1.5 V of rails |
| 7 | V+ | Positive supply rail; requires local 0.1 µF ceramic decoupling for EMI immunity |
| 8 | Offset Trim | Connects to other end of same potentiometer as Pin 1; forms adjustable voltage divider |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed offset & drift | Eliminates need for factory calibration in production test; reduces BOM count by removing trim pots |
| Internal bias current cancellation | Removes requirement for external RB = R1∥R2, avoiding added offset and Johnson noise |
| Input protection diodes + 1-kΩ series resistors | Withstands ±30-V differential input without damage; prevents latch-up during sensor overvoltage events |
| EMI rejection ratio (EMIRRIN+) | High RF immunity on noninverting input; maintains offset stability in noisy industrial environments |
| Phase-inversion free architecture | Guarantees monotonic output behavior during common-mode overload - no output polarity reversal |
Applications
| Weigh Scale Front-End | Temperature Transmitter |
|---|---|
Use Scenario: Amplifies mV-level output from load cell bridges under varying ambient temperatures and mechanical stress. IC Role / Device Role / Timing Role: Precision DC-coupled instrumentation amplifier core with ultra-low drift and 0.22 µVPP 0.1–10 Hz noise. Use Value: Enables 100,000-count resolution without recalibration across –10°C to +50°C operating range. |
Use Scenario: Conditions RTD or thermocouple signals in 4–20 mA loop transmitters with HART modulation. IC Role / Device Role / Timing Role: Low-bias-current, high-PSRR buffer and gain stage driving ADC reference and excitation circuits. Use Value: Maintains <±0.1°C accuracy over full industrial temperature range with no external trimming. |
| Analog Input Module | Data Acquisition (DAQ) |
Use Scenario: Signal conditioning path in modular PLC I/O cards handling multiple sensor types (voltage, current, resistance). IC Role / Device Role / Timing Role: High-CMRR, rail-swinging amplifier for multiplexed inputs with shared reference and guard traces. Use Value: Achieves >120 dB channel-to-channel isolation and <0.002% THD+N at 1 kHz for 16-bit+ acquisition. |
Use Scenario: Front-end amplifier in portable battery-operated DAQ units measuring low-level biopotentials or environmental sensors. IC Role / Device Role / Timing Role: Ultra-low-power, low-noise gain block with 800 µA quiescent current and 134 dB open-loop gain. Use Value: Extends battery life beyond 12 months while preserving sub-µV sensitivity in 24-bit sigma-delta systems. |
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, drift, and noise specs but lacks trim pins | Used where space-constrained dual-sensor conditioning is needed; not drop-in for single-channel OPA277UAE4 layouts | Select when dual amplification is required and PCB area is limited - verify routing symmetry for both channels |
| OPA2189IDR | Zero-drift auto-zero architecture; 0.005 µV/°C drift, 5.6 nV/√Hz noise at 1 kHz; higher IQ (1.3 mA) | Better for <0.01°C thermal stability or AC-coupled high-frequency precision; less suitable for ultra-low-noise DC | Choose for zero-drift-critical applications where long-term calibration drift must be eliminated - accept higher power and cost |
Compared with OPA2277UA and OPA2189IDR, the OPA277UAE4 uniquely combines user-adjustable offset trim, bipolar-input low 1/f noise, and proven reliability in legacy industrial designs - making it optimal for recalibration-capable, low-maintenance analog front-ends.
Availability
OPA277UAE4 is available at Aetrix Electronics and suitable for weigh scale manufacturing, temperature transmitter design, and analog input module development requiring stable component supply and long-lifecycle support.
Supply support for OPA277UAE4 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 decades of heritage in precision op amps and industrial signal chains.
The OPAx277 product line was engineered to replace OP-177 in high-stability measurement systems - delivering lower noise, wider output swing, and half the quiescent current while maintaining pin compatibility and ease of use.
FAQ
What is the maximum supply voltage for OPA277UAE4?
The OPA277UAE4 supports dual supplies from ±2 V to ±18 V, with absolute maximum rating of ±18 V per rail. The total supply voltage (V+ to V−) must not exceed 36 V. Operation at ±15 V is fully characterized and recommended for optimal performance across temperature.
Does OPA277UAE4 require external offset trim in most applications?
No - the OPA277UAE4 is laser-trimmed to ±10 µV offset (max) at 25°C and ±30 µV over –40°C to +85°C, so external trimming is unnecessary in typical applications. Pins 1 and 8 are provided only for special cases demanding sub-5 µV residual offset, such as metrology-grade calibration equipment.
Can OPA277UAE4 drive capacitive loads?
Yes - the OPA277UAE4 is stable with capacitive loads up to 1500 pF, as confirmed in Figure 6-19 of the datasheet. For loads >100 pF, add a small series resistor (10–50 Ω) between output and capacitance to maintain phase margin and prevent peaking in step response.
What is the input bias current specification for OPA277UAE4?
The OPA277UAE4 has a maximum input bias current of ±1 nA at 25°C and ±2 nA over –40°C to +85°C. Its internal bias current cancellation circuit ensures input offset current matches bias current magnitude, eliminating need for external compensation resistors in standard configurations.
Is OPA277UAE4 pin-compatible with OP-07 or OP-177?
Yes - the OPA277UAE4 uses the same SOIC-8 pinout as OP-07 and OP-177, with identical pin functions (V+, –In, +In, V–, Output, etc.). It is a direct replacement offering improved noise, drift, speed, and quiescent current, with no PCB layout changes required.
OPA277UAE4 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:
- 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
OPA277UAE4 FAQ
1.How can I place an order for OPA277UAE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA277UAE4 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 OPA277UAE4 reliable?
The price and inventory of OPA277UAE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA277UAE4 is usually 5 days.
3.What payment methods are accepted for OPA277UAE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA277UAE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA277UAE4?
OPA277UAE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA277UAE4 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 OPA277UAE4?
For technical support, including OPA277UAE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA277UAE4 requirements.
6.How does Aetrix verify that OPA277UAE4 is sourced from the original manufacturer or authorized distributors?
All OPA277UAE4 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 OPA277UAE4 meets industry standards.
7.What is the process for return or replacement of OPA277UAE4?
All OPA277UAE4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA277UAE4, 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 OPA277UAE4 part is unused and in its original packaging.
Return procedure for OPA277UAE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA277UAE4 Tags
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