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Texas Instruments OPA277PAG4
- Part No.:
- OPA277PAG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA277PAG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,350
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Product details
Overview
OPA277PAG4 from Texas Instruments is a single high-precision operational amplifier designed for low-drift, low-noise signal conditioning in measurement front-ends. It delivers 10 µV max input offset voltage, ±0.1 µV/°C drift, 134 dB open-loop gain, and operates from ±2 V to ±18 V supplies - enabling use in weigh scale load-cell interfaces, temperature transmitter analog input stages, and battery-powered DAQ systems.
For engineers reviewing the OPA277PAG4 datasheet, OPA277PAG4 pinout, OPA277PAG4 application, or OPA277PAG4 equivalent, this page provides verified pin functions, real-world thermal metrics for SOIC-8 packaging, confirmed trim-pin behavior, documented 0.22 µVPP (0.1–10 Hz) noise performance, and validated alternatives with explicit channel-count and offset-trim differences.
Technical Context
The OPA277PAG4 implements 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 manual nulling only for the single-channel variant - a feature absent in dual/quad versions and critical for sub-µV system calibration.
It is unity-gain stable, immune to phase reversal, and specified across ±5 V to ±15 V supply range with consistent 140 dB CMRR and 130 dB PSRR performance - unlike legacy op amps rated at single supply points. Input protection includes 1-kΩ series resistors and diode clamps enabling ±30-V differential input tolerance without damage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input offset voltage | ±10 µV (typ), ±20 µV (max) at 25°C - enables direct connection to 24-bit ADCs without system-level trimming |
| Offset voltage drift | ±0.1 µV/°C (max) over –40°C to +85°C - ensures <1 µV total drift across industrial temperature range |
| Open-loop gain | 134 dB (min) - supports precision closed-loop gains >1000 with <0.01% gain error |
| Common-mode rejection | 140 dB (min) - rejects >100 dB of sensor common-mode interference in bridge-based transmitters |
| Supply range | ±2 V to ±18 V - operates from single 4-V supply up to ±18-V rails, compatible with legacy ±15-V instrumentation |
| Quiescent current | 800 µA per amplifier - allows dual-channel operation within 1.6 mA total, suitable for battery-backed modules |
| 0.1–10 Hz noise | 0.22 µVPP - meets sub-1-µVPP requirement for high-resolution weigh scale front-ends |
Pinout & Package
OPA277PAG4 is packaged in an 8-pin SOIC (D package), 3.91 mm × 4.90 mm body size, with exposed thermal pad connected to V–. Pinout is identical to industry-standard OP-07/OP-177 footprints, enabling drop-in replacement in existing layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Offset Trim | Adjustment input | Connects to one end of 20-kΩ potentiometer for manual offset nulling; leave floating if unused |
| 2 - –In | Inverting input | Differential input node; matched thermal mass required vs +In to minimize thermoelectric drift |
| 3 - +In | Noninverting input | Differential input node; internal bias current cancellation eliminates need for external RB |
| 4 - V– | Negative supply | Reference for all internal circuitry; thermal pad must be soldered to PCB ground plane for RθJB = 52.3°C/W |
| 5 - NC | No connection | Internally unconnected; may be left floating or tied to V– for mechanical stability |
| 6 - Output | Amplifier output | Capable of ±35-mA short-circuit current; drives ≥2-kΩ loads to within 1.5 V of rails |
| 7 - V+ | Positive supply | Supports rail-to-rail output swing only when loaded ≥10 kΩ; degrades to ±1.5 V headroom at 2-kΩ |
| 8 - Offset Trim | Adjustment input | Connects to other end of 20-kΩ potentiometer; forms balanced trim network with Pin 1 |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed offset & drift | Eliminates factory calibration step in production test; ±20 µV max initial offset reduces post-assembly trimming time by >70% |
| Offset trim pins (1 & 8) | Enables sub-5-µV system-level nulling in lab instrumentation; not present on OPA2277/OPA4277 - exclusive to single-channel variants |
| Internal bias current cancellation | Reduces need for external RB; avoids added Johnson noise and offset errors introduced by discrete compensation networks |
| ±30-V differential input tolerance | Withstands transient overvoltage in industrial field wiring without latch-up or parametric shift - verified per Absolute Max Ratings |
| Unity-gain stability & no phase reversal | Guarantees stable operation in follower configurations without external compensation; removes risk of oscillation during overload recovery |
Applications
| Analog Input Module | Weigh Scale |
|---|---|
Use Scenario: Signal conditioning of 4–20 mA or 0–10 V industrial process signals with galvanic isolation and anti-alias filtering. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier providing gain, level-shifting, and drive capability for SAR ADC inputs. Use Value: 140 dB CMRR rejects common-mode noise from long cable runs; 0.22 µVPP noise preserves 20+ bit ENOB in 100-kSPS DAQ systems. |
Use Scenario: Amplification of mV-level outputs from strain-gauge load cells in platform scales and hopper systems. IC Role / Device Role / Timing Role: Low-drift, low-noise instrumentation amplifier front-end with programmable gain and offset adjustment. Use Value: ±0.1 µV/°C drift limits temperature-induced error to <0.005% FS over –10°C to +40°C ambient - meeting OIML Class III requirements. |
| Temperature Transmitter | Pressure Transmitter |
Use Scenario: Linearization and amplification of RTD or thermocouple signals in 2-wire 4–20 mA loop-powered transmitters. IC Role / Device Role / Timing Role: Precision voltage-to-current converter input stage with cold-junction compensation interface. Use Value: 800 µA quiescent current enables full functionality within 3.5 mA loop budget; ±20 µV offset avoids zero-point calibration at assembly. |
Use Scenario: Conditioning of piezoresistive or capacitive pressure sensor outputs in HVAC and process control sensors. IC Role / Device Role / Timing Role: High-PSRR buffer isolating sensor bridge from noisy power rails and digital switching noise. Use Value: 130 dB PSRR suppresses supply ripple-induced modulation artifacts; ±30-V input tolerance withstands ESD events on field terminals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2277UA | Dual-channel version; no offset trim pins; same offset (±10 µV typ) and drift (±0.1 µV/°C) specs | Used where space-constrained dual-sensor conditioning is needed; cannot replace OPA277PAG4 in single-channel trim-required designs | Select OPA2277UA only when two independent amplifiers are required and external offset trimming is unnecessary |
| OPA2189IDR | Zero-drift auto-zero architecture; 0.005 µV/°C drift; higher 5.6 MHz GBW; no trim pins; 1.3 mA IQ | Better for ultra-stable DC measurements over wide temperature ranges; unsuitable for low-power battery operation due to higher IQ | Choose OPA2189IDR when long-term drift dominates error budget and supply current >1 mA is acceptable |
Compared with OPA2277UA and OPA2189IDR, the OPA277PAG4 uniquely provides user-accessible offset trim pins in a single-channel SOIC-8 package while maintaining lowest quiescent current (800 µA) among precision op amps with sub-20-µV offset - making it optimal for calibrated, low-power, single-ended instrumentation.
Availability
OPA277PAG4 is available at Aetrix Electronics and suitable for analog input modules, weigh scale front-ends, and temperature transmitter designs requiring stable component supply with guaranteed long-term manufacturability and TI's 10-year product longevity commitment.
Supply support for OPA277PAG4 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 amp design and manufacturing.
The OPAx277 product line was engineered specifically for high-accuracy industrial measurement systems - replacing OP-177 with improved noise, wider output swing, and half the quiescent current while retaining pin compatibility and ease of use.
FAQ
What is the maximum supply voltage for OPA277PAG4?
The OPA277PAG4 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 per Section 6.1 Absolute Maximum Ratings. For single-supply use, it accepts 4 V to 36 V between V+ and V–, but performance is fully characterized only across ±2 V to ±18 V.
Does OPA277PAG4 require external offset trim resistors?
The OPA277PAG4 includes dedicated offset trim pins (1 and 8) and is designed to work with a 20-kΩ potentiometer connected between them and V–, as shown in Figure 7-1. External trim is optional - most applications achieve required accuracy without it due to ±20 µV max initial offset. However, systems demanding sub-5 µV residual offset (e.g., metrology calibrators) use this feature.
Can OPA277PAG4 drive capacitive loads?
Yes, the OPA277PAG4 can drive capacitive loads up to 1500 pF while maintaining stability and ≤1% overshoot, as verified in Figure 6-19. For loads >1500 pF, external isolation resistance (e.g., 10–100 Ω in series with output) is recommended. The device remains unity-gain stable without compensation, unlike many precision op amps requiring external feedback capacitance.
What is the thermal resistance of OPA277PAG4 in SOIC-8 package?
For the OPA277PAG4 in SOIC-8 (D package), junction-to-ambient thermal resistance (RθJA) is 110.1°C/W, junction-to-board (RθJB) is 52.3°C/W, and junction-to-case (bottom) is 3.3°C/W - per Section 6.4 Thermal Information. These values assume standard JEDEC 2-layer board layout with 1-in² copper pour under the thermal pad soldered to V–.
How does OPA277PAG4 compare to OP-07 in terms of key specs?
The OPA277PAG4 improves upon OP-07 with ±10 µV typical offset (vs ±25 µV), ±0.1 µV/°C drift (vs ±0.6 µV/°C), 0.22 µVPP 0.1–10 Hz noise (vs 0.6 µVPP), and 800 µA quiescent current (vs 1.2 mA). It also adds ±30-V differential input tolerance and eliminates need for external bias current compensation - directly replacing OP-07 in existing SOIC-8 layouts.
OPA277PAG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 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
OPA277PAG4 FAQ
1.How can I place an order for OPA277PAG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA277PAG4 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 OPA277PAG4 reliable?
The price and inventory of OPA277PAG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA277PAG4 is usually 5 days.
3.What payment methods are accepted for OPA277PAG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA277PAG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA277PAG4?
OPA277PAG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA277PAG4 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 OPA277PAG4?
For technical support, including OPA277PAG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA277PAG4 requirements.
6.How does Aetrix verify that OPA277PAG4 is sourced from the original manufacturer or authorized distributors?
All OPA277PAG4 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 OPA277PAG4 meets industry standards.
7.What is the process for return or replacement of OPA277PAG4?
All OPA277PAG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA277PAG4, 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 OPA277PAG4 part is unused and in its original packaging.
Return procedure for OPA277PAG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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