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Texas Instruments OPA4277UAG4
- Part No.:
- OPA4277UAG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4277UAG4.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,458
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Product details
Overview
OPA4277UAG4 from Texas Instruments is a quad high-precision operational amplifier designed for low-drift, low-noise signal conditioning in industrial measurement systems. 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 stable DC-coupled amplification in weigh scales and temperature transmitters.
For engineers reviewing the OPA4277UAG4 datasheet, OPA4277UAG4 pinout, OPA4277UAG4 application, or OPA4277UAG4 equivalent, this page provides verified specifications, SOIC-14 package layout, real-world performance boundaries (e.g., ±1.5 V output swing at 2 kΩ load), and two validated alternative parts with documented functional trade-offs.
Technical Context
The OPA4277UAG4 uses laser-trimmed bipolar input stage architecture to achieve ultra-low offset and drift while maintaining unity-gain stability and freedom from phase inversion. Its input protection includes 1-kΩ series resistors and diode clamps, allowing ±30-V differential input tolerance without damage.
All four amplifiers are fully independent - no crosstalk between channels - and feature internally compensated input bias current cancellation, eliminating need for external bias-current compensation resistors. Performance is specified across ±5 V to ±15 V supply range with single limit, supporting real-world dual-supply instrumentation designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input offset voltage | ±10 µV max (TA = 25°C); enables <1 LSB error in 20-bit DAQ systems without trimming |
| Offset drift | ±0.1 µV/°C max (–40°C to +85°C); ensures <1 µV total drift over 50°C ambient change |
| Open-loop gain | 134 dB min; supports >100 dB closed-loop accuracy in precision gain stages |
| CMRR / PSRR | 140 dB / 130 dB min; rejects power supply ripple and common-mode interference in noisy plant environments |
| Quiescent current | 800 µA per amplifier; allows quad-channel precision amplification within 3.2 mA total supply budget |
| Output swing | (V–) + 1.5 V to (V+) – 1.5 V @ 2 kΩ; delivers full ±13.5 V swing on ±15 V rails for maximum dynamic range |
| Gain-bandwidth | 1 MHz; sufficient for anti-aliasing filters and sensor signal bandwidths up to 100 kHz |
Pinout & Package
OPA4277UAG4 is supplied in a 14-pin SOIC (D package) with 3.91 mm × 8.65 mm body size and standard pin 1 indicator. Thermal performance: RθJA = 86.5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Out A | Amplifier A output; drives feedback network or next-stage input with 40 Ω open-loop impedance |
| 2 | –In A | Inverting input A; accepts feedback signal or inverted sensor input with 250 GΩ || 3 pF common-mode impedance |
| 3 | +In A | Noninverting input A; high-impedance reference/sensor node; thermally matched layout critical for drift minimization |
| 4 | V+ | Positive supply rail; must be decoupled with 0.1 µF ceramic capacitor placed ≤2 mm from pin |
| 5 | +In B | Noninverting input B; electrically isolated from channel A; no shared internal nodes |
| 6 | –In B | Inverting input B; identical specs to –In A; independent bias current cancellation circuitry |
| 7 | Out B | Amplifier B output; fully independent; supports simultaneous multi-channel acquisition |
| 8 | Out C | Amplifier C output; same drive capability and settling time (16 µs to 0.01%) as Out A/B |
| 9 | –In C | Inverting input C; matches channel A/B electrical behavior; no interaction under overload |
| 10 | +In C | Noninverting input C; thermal symmetry with +In A/B required for sub-µV drift performance |
| 11 | V– | Negative supply rail; return path for all four amplifiers; connect decoupling cap close to pin |
| 12 | +In D | Noninverting input D; fourth independent channel; supports 4-channel analog front-end integration |
| 13 | –In D | Inverting input D; protected by same 1-kΩ series resistor + diode clamp as other inputs |
| 14 | Out D | Amplifier D output; capable of ±35 mA short-circuit current; maintains linearity to ±13.5 V swing |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed input stage | Eliminates need for external offset trim in >95% of applications; ±20 µV max initial offset |
| Independent quad architecture | Zero crosstalk between channels; channel separation >120 dB up to 100 kHz |
| EMI rejection ratio (EMIRR) | High immunity to RF rectification at +In pins; prevents offset shifts from 100 MHz–1 GHz noise sources |
| Input protection | ±30-V differential input tolerance with no latch-up or parametric shift; safe for field-connected sensors |
| Bias current cancellation | Residual IB ≤ ±1 nA; removes need for external RB = R1||R2, reducing board area and noise contribution |
Applications
| Analog Input Module | Weigh Scale |
|---|---|
Use Scenario: 16- to 24-bit analog input module acquiring signals from multiple RTDs, strain gauges, and 4–20 mA loops in PLC backplanes. IC Role / Device Role / Timing Role: Quad OPA4277UAG4 performs simultaneous low-drift, low-noise instrumentation amplification and filtering for each channel before ADC sampling. Use Value: Enables 0.001% full-scale accuracy over –25°C to +70°C ambient without recalibration, leveraging ±0.1 µV/°C drift and 140 dB CMRR. |
Use Scenario: Platform scale electronics measuring load cell mV/V outputs with 10,000+ division resolution. IC Role / Device Role / Timing Role: OPA4277UAG4 serves as first-stage difference amplifier and reference buffer in bridge-sensing front end. Use Value: Ultra-low 10 µV offset ensures zero-point stability; 0.22 µVPP (0.1–10 Hz) noise preserves resolution below 1 µV step size. |
| Temperature Transmitter | Data Acquisition (DAQ) |
Use Scenario: HART-enabled 4–20 mA temperature transmitter converting thermocouple or RTD signals in hazardous-area field devices. IC Role / Device Role / Timing Role: OPA4277UAG4 conditions thermocouple cold-junction compensation and linearizes RTD Wheatstone bridge outputs. Use Value: Wide ±2 V to ±18 V supply range supports loop-powered operation; 130 dB PSRR rejects supply ripple from 24 V DC bus. |
Use Scenario: Portable battery-powered DAQ system capturing slow-varying sensor data (pressure, humidity, gas concentration) at 10 SPS with 22-bit ENOB. IC Role / Device Role / Timing Role: Quad OPA4277UAG4 provides programmable-gain, anti-aliasing, and reference buffering across four simultaneous channels. Use Value: 800 µA per amplifier enables 3.2 mA total quiescent draw; 1 MHz GBW supports 100 kHz anti-alias filter design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4188AIDR | Zero-drift auto-zero topology; 0.005 µV/°C drift vs. OPA4277UAG4's ±0.1 µV/°C; higher 1/f noise (0.3 µVPP) | Better long-term stability in calibration-critical lab instruments; less suitable for wideband sensor excitation | Select OPA4188AIDR when drift dominates error budget over decades; retain OPA4277UAG4 for lower noise in 0.1–10 Hz band |
| AD8629ARZ | CMOS input; 1 pA max IB vs. 1 nA for OPA4277UAG4; lower PSRR (114 dB) and CMRR (120 dB) | Superior for ultra-high-impedance pH or ion-selective electrodes; weaker rejection of supply/ground noise in industrial settings | Choose AD8629ARZ for femtoampere-level source impedances; prefer OPA4277UAG4 for 4–20 mA loop interfaces requiring robust PSRR |
Compared with OPA4188AIDR and AD8629ARZ, the OPA4277UAG4 offers optimal balance of ultra-low drift, low 0.1–10 Hz noise, high PSRR/CMRR, and proven reliability in industrial temperature ranges - making it the preferred choice for factory-floor analog front ends where supply noise and thermal gradients dominate.
Availability
OPA4277UAG4 is available at Aetrix Electronics and suitable for analog input modules, weigh scales, and temperature transmitters requiring stable component supply across extended product lifecycles and industrial temperature ranges.
Supply support for OPA4277UAG4 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The OPAx277 product line was engineered specifically for high-accuracy DC-coupled measurement systems - replacing OP-177 with improved noise, wider output swing, and half the quiescent current while maintaining laser-trimmed precision.
FAQ
What is the maximum supply voltage for OPA4277UAG4?
The OPA4277UAG4 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, where all key parameters - including offset voltage, CMRR, and PSRR - are guaranteed with single limit specification.
Does OPA4277UAG4 require external offset trim?
No - the OPA4277UAG4 is laser-trimmed during manufacturing and has ±10 µV max input offset voltage at 25°C, so external trim is unnecessary in most applications. Unlike the single-channel OPA277, the quad OPA4277UAG4 does not include offset trim pins; its precision is achieved entirely through internal trimming.
What is the output voltage swing capability of OPA4277UAG4?
At 2 kΩ load, the OPA4277UAG4 delivers (V–) + 1.5 V to (V+) – 1.5 V output swing across –40°C to +85°C. On ±15 V supplies, this equals ±13.5 V swing - significantly wider than legacy OP-177 - enabling higher signal-to-noise ratio in precision sensor interfaces without rail-to-rail input/output circuitry.
Is OPA4277UAG4 unity-gain stable?
Yes - the OPA4277UAG4 is explicitly designed for unity-gain stability and exhibits no phase inversion or oscillation when configured as a voltage follower. Its internal compensation ensures stable operation with capacitive loads up to 1500 pF, as verified in Figure 6-19 of the official datasheet SBOS079C.
How does OPA4277UAG4 handle input overvoltage conditions?
The OPA4277UAG4 features 1-kΩ series input resistors and diode clamps on all inputs, allowing safe operation with ±30-V differential input voltage without damage. While conduction through clamps may affect slewing in unity-gain followers, the device remains fully functional and retains specifications after overvoltage events.
OPA4277UAG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 0.8V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 4 nA
- Voltage - Input Offset:
- 20 µV
- Current - Supply:
- -
- 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:
- 14-SOIC
OPA4277UAG4 FAQ
1.How can I place an order for OPA4277UAG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4277UAG4 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 OPA4277UAG4 reliable?
The price and inventory of OPA4277UAG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4277UAG4 is usually 5 days.
3.What payment methods are accepted for OPA4277UAG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4277UAG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4277UAG4?
OPA4277UAG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4277UAG4 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 OPA4277UAG4?
For technical support, including OPA4277UAG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4277UAG4 requirements.
6.How does Aetrix verify that OPA4277UAG4 is sourced from the original manufacturer or authorized distributors?
All OPA4277UAG4 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 OPA4277UAG4 meets industry standards.
7.What is the process for return or replacement of OPA4277UAG4?
All OPA4277UAG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA4277UAG4, 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 OPA4277UAG4 part is unused and in its original packaging.
Return procedure for OPA4277UAG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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