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Texas Instruments OPA277PA
- Part No.:
- OPA277PA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA277PA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:306
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Product details
Overview
OPA277PA from Texas Instruments is a single 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, and 134 dB open-loop gain, operating from ±2 V to ±18 V supplies. It serves as a direct replacement for OP-07/OP-177 in analog input modules, weigh scales, and temperature transmitters.
For engineers reviewing the OPA277PA datasheet, OPA277PA pinout, OPA277PA application, or OPA277PA equivalent, key selection criteria include ultra-low drift performance over –40°C to +85°C, external offset trim capability, dual-supply operation with rail-to-rail output swing limitations, and compatibility with high-impedance sensor interfaces requiring <1 nA bias current.
Technical Context
The OPA277PA uses a laser-trimmed bipolar input stage with internal bias current cancellation, eliminating need for external compensation resistors. Its architecture supports unity-gain stability and avoids phase inversion under overload-critical for precision integrators and sensor front-ends.
It features dedicated offset trim pins (1 and 8) enabling manual nulling of residual input offset, while maintaining 140 dB CMRR and 130 dB PSRR across ±5 V to ±15 V supply range. Input protection includes 1-kΩ series resistors and diode clamps rated for ±30-V differential input without damage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | ±20 µV max at 25°C; ensures <0.01% error in 2-V full-scale 16-bit DAQ systems without trimming |
| Drift | ±0.1 µV/°C max; contributes <1.5 µV error over 15°C ambient shift in lab instrumentation |
| Open-Loop Gain | 134 dB min; enables <1 ppm closed-loop gain error with 1000× amplification |
| CMRR / PSRR | 140 dB / 130 dB min; rejects >100 V common-mode noise and >30 V supply ripple at DC |
| Quiescent Current | 800 µA per amplifier; allows dual-supply operation in battery-powered field transmitters for >1-year runtime |
| Supply Range | ±2 V to ±18 V; supports legacy ±15-V industrial rails and modern ±5-V low-power systems |
| Input Bias Current | ±1 nA max; enables use with >1 GΩ source impedances (e.g., piezoresistive pressure sensors) |
Pinout & Package
OPA277PA is available in 8-pin PDIP (P) package, 3.91 mm × 4.90 mm body size, with through-hole mounting and industry-standard pin spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim | Adjusts input offset voltage via external potentiometer; leave floating if unused |
| 2 | –In | Inverting input; accepts differential signals up to (V–)+2 V and (V+)-2 V |
| 3 | +In | Noninverting input; matched thermal path to Pin 2 for drift minimization |
| 4 | V– | Negative supply rail; connects to lowest system voltage (e.g., –15 V or ground in single-supply) |
| 5 | NC | No internal connection; must remain unconnected and unstubbed |
| 6 | Output | Amplified output; drives loads ≥2 kΩ with ±1.5 V headroom from rails |
| 7 | V+ | Positive supply rail; connects to highest system voltage (e.g., +15 V) |
| 8 | Offset Trim | Second terminal for external trim circuit; forms voltage divider with Pin 1 |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low drift | ±0.1 µV/°C max ensures stable calibration over temperature cycling in weigh scale load cells |
| External offset trim | Pins 1 and 8 support <±5 µV post-assembly nulling for metrology-grade applications |
| Input bias current cancellation | Eliminates need for external Rcomp, reducing board area and avoiding added noise/offset in high-Z sensor paths |
| Overvoltage protected inputs | Withstands ±30-V differential input without damage-critical for field-connected analog inputs |
| Unity-gain stable | Operates reliably in follower configurations without external compensation, simplifying DAQ front-end design |
Applications
| Analog Input Module | Weigh Scale |
|---|---|
Use Scenario: Signal conditioning of 4–20 mA or 0–10 V industrial process signals with 16-bit ADC interfacing. IC Role / Device Role / Timing Role: Precision buffer and gain stage before sigma-delta ADC, rejecting common-mode noise on long cables. Use Value: 140 dB CMRR suppresses >100 V of induced noise on factory floor wiring, preserving 16-bit ENOB. | Use Scenario: Amplification of mV-level outputs from strain gauge bridges in platform or tank weighing systems. IC Role / Device Role / Timing Role: Low-drift instrumentation amplifier front-end with programmable gain and offset correction. Use Value: ±0.1 µV/°C drift limits zero-point drift to <10 µV over 50°C ambient range-equivalent to <0.02% FS error. |
| Temperature Transmitter | Pressure Transmitter |
Use Scenario: Linearization and cold-junction compensation for thermocouple outputs in HVAC or process control. IC Role / Device Role / Timing Role: Precision voltage reference buffer and RTD excitation current source amplifier. Use Value: 10 µV offset enables <0.1°C resolution in Type K thermocouple systems with 100× gain. | Use Scenario: Conditioning of millivolt outputs from piezoresistive or capacitive pressure sensors in industrial manifolds. IC Role / Device Role / Timing Role: High-input-impedance amplifier for bridge-based sensors with minimal loading error. Use Value: ±1 nA bias current prevents >1 mV error when interfacing with 1 GΩ sensor sources at 25°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA277UA | Same core specs but SOIC-8 package; no PDIP option; slightly higher offset drift (±0.15 µV/°C max) | Suitable for surface-mount production; less suitable for prototyping or through-hole test fixtures | Select OPA277UA only when PCB layout requires SOIC footprint and thermal performance permits |
| OPA2277PA | Dual-channel version in same PDIP-8 package; shared supply pins; channel separation >120 dB at DC | Reduces component count in multi-channel DAQ systems but increases crosstalk risk in mixed-signal designs | Choose OPA2277PA when two matched amplifiers are needed and inter-channel isolation >100 dB is acceptable |
Compared with OPA277UA and OPA2277PA, the OPA277PA offers unique through-hole manufacturability, guaranteed ±0.1 µV/°C drift, and dedicated trim pins-making it optimal for calibration-critical bench instruments and repair-friendly field modules.
Availability
OPA277PA is available at Aetrix Electronics and suitable for analog input modules, weigh scales, and temperature transmitters requiring stable component supply across extended product lifecycles.
Supply support for OPA277PA 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 signal chain components.
The OPAx277 product line targets high-accuracy measurement systems-including industrial process control, test equipment, and scientific instrumentation-where offset stability and noise performance define system resolution.
FAQ
What is the maximum supply voltage for OPA277PA?
The OPA277PA supports dual-supply operation 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 condition is ≤±15 V for guaranteed specification compliance across temperature. Exceeding ±18 V risks permanent damage per Absolute Maximum Ratings table.
Does OPA277PA require external bias current compensation resistors?
No, the OPA277PA incorporates internal bias current cancellation, making external Rcomp unnecessary. Adding such a resistor would increase noise and potentially degrade offset performance. This design eliminates a common source of error in high-impedance sensor interfaces-confirmed in Section 7.3.4 of the official datasheet for OPA277PA.
Can OPA277PA drive capacitive loads?
Yes, the OPA277PA can drive moderate capacitive loads up to 1500 pF while maintaining stability, as verified in Figure 6-19 of the OPA277PA datasheet. For loads >1000 pF, consider adding a small series resistor (e.g., 10–50 Ω) between output and capacitor to isolate reactive feedback and prevent peaking or oscillation.
What is the purpose of Pins 1 and 8 on OPA277PA?
Pins 1 and 8 are dedicated offset trim terminals for the OPA277PA. They allow external adjustment of input offset voltage using a 20-kΩ potentiometer (per Figure 7-1), enabling sub-5 µV nulling in metrology-grade applications. These pins are inactive unless connected-leaving them floating maintains factory-trimmed performance.
How does OPA277PA compare to OP-177 in practical use?
The OPA277PA replaces OP-177 with measurable improvements: half the quiescent current (800 µA vs 1.6 mA), twice the slew rate (0.8 V/µs vs 0.4 V/µs), wider output swing (±1.5 V headroom vs ±2 V), and lower 0.1–10 Hz noise (0.22 µVPP vs 0.35 µVPP). All specifications are guaranteed over –40°C to +85°C, unlike OP-177's limited temperature coverage-making OPA277PA more robust in field-deployed systems.
OPA277PA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA277PA FAQ
1.How can I place an order for OPA277PA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA277PA 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 OPA277PA reliable?
The price and inventory of OPA277PA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA277PA is usually 5 days.
3.What payment methods are accepted for OPA277PA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA277PA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA277PA?
OPA277PA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA277PA 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 OPA277PA?
For technical support, including OPA277PA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA277PA requirements.
6.How does Aetrix verify that OPA277PA is sourced from the original manufacturer or authorized distributors?
All OPA277PA 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 OPA277PA meets industry standards.
7.What is the process for return or replacement of OPA277PA?
All OPA277PA units undergo pre-shipment inspection (PSI). If there is an issue with OPA277PA, 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 OPA277PA part is unused and in its original packaging.
Return procedure for OPA277PA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA277PA Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
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LM358ADR
Texas Instruments
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LM2904DGKR
Texas Instruments
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LM324DR
Texas Instruments
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
Microchip Technology
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LM324PWR
Texas Instruments
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LM2902PWR
Texas Instruments
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LM2902DR
Texas Instruments
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LM358P
Texas Instruments
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