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Texas Instruments OPA4277UA/2K5G4
- Part No.:
- OPA4277UA/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4277UA/2K5G4.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,846
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Product details
Overview
OPA4277UA/2K5G4 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 OPA4277UA/2K5G4 datasheet, OPA4277UA/2K5G4 pinout, OPA4277UA/2K5G4 application, or OPA4277UA/2K5G4 equivalent, key selection criteria include ultra-low long-term drift (0.2 µV/month), 0.1–10 Hz noise of 0.22 µVPP, channel separation >120 dB at 1 kHz, and guaranteed performance across –40°C to +85°C without external trimming.
Technical Context
The OPA4277UA/2K5G4 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 fully independent quad architecture ensures <0.1 µV/V channel-to-channel crosstalk under DC and dynamic overload conditions.
Unlike legacy precision op amps, it specifies key parameters - including CMRR (140 dB), PSRR (130 dB), and AOL (134 dB) - over the full ±5 V to ±15 V supply range with no derating, and maintains rail-to-rail output swing capability (±1.5 V from rails at 2 kΩ load) across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | ±10 µV max (typical ±20 µV); enables sub-16-bit DC accuracy without calibration in 24-bit DAQ front-ends |
| Offset Drift | ±0.1 µV/°C max over –40°C to +85°C; supports stable operation in uncontrolled industrial environments |
| Open-Loop Gain | 134 dB min; ensures <1 ppm gain error in unity-gain buffer configurations with 10 kΩ source impedance |
| CMRR / PSRR | 140 dB / 130 dB min; rejects common-mode noise from 4–20 mA loops and ripple on shared analog power rails |
| Quiescent Current | 800 µA per amplifier; allows four-channel precision amplification within 3.2 mA total, suitable for battery-powered field instruments |
| 0.1–10 Hz Noise | 0.22 µVPP; meets <1 µVPP requirement for 24-bit sigma-delta ADC input stages in pressure transmitters |
| Supply Range | ±2 V to ±18 V; supports dual-rail operation from ±5 V (data acquisition) up to ±15 V (industrial control I/O) |
Pinout & Package
OPA4277UA/2K5G4 is housed in a 14-pin SOIC (D package) with 3.91 mm × 8.65 mm body size and standard JEDEC MS-012 footprint. Pin 1 is marked with a dot; pin 4 is V+, pin 11 is V–, and all four output pins (1, 7, 8, 14) are fully buffered and independently isolated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output A | Low-impedance buffered output for channel A; capable of ±35 mA short-circuit current |
| 2 | Inverting Input A | Differential input node for channel A; protected by 1-kΩ series resistor and ESD diodes |
| 3 | Noninverting Input A | Differential input node for channel A; matched thermal path to pin 2 for minimal thermoelectric offset |
| 4 | V+ | Positive supply connection; must be decoupled with 0.1 µF ceramic capacitor close to pin |
| 5 | Noninverting Input B | Input for channel B; electrically isolated from other channels to prevent crosstalk-induced measurement error |
| 6 | Inverting Input B | Input for channel B; identical layout symmetry to pins 2/3 for consistent thermal behavior |
| 7 | Output B | Independent output for channel B; no interaction with channel A even during overload recovery |
| 8 | Output C | Third output channel; supports simultaneous multi-sensor conditioning without multiplexing delay |
| 9 | Inverting Input C | Input for channel C; referenced to same V– (pin 11) as all other channels for common-mode stability |
| 10 | Noninverting Input C | Input for channel C; pinout symmetry minimizes PCB trace length mismatch vs. pins 2/3/5/6 |
| 11 | V– | Negative supply connection; thermal pad on bottom of SOIC variant connected to V– for improved θJA |
| 12 | Noninverting Input D | Input for channel D; supports four independent sensor interfaces on single IC, reducing board area by ~75% vs. singles |
| 13 | Inverting Input D | Input for channel D; identical electrical characteristics to other inputs, verified over full temp/supply range |
| 14 | Output D | Fourth output; settles to 0.01% in 16 µs (±15 V supply), enabling fast multi-channel scanning in lab instrumentation |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed offset & drift | Eliminates need for manual nulling in production; 99.7% of units meet ±20 µV initial offset spec |
| Unity-gain stable architecture | Operates reliably with gain = 1 without external compensation; avoids phase inversion in sensor buffer applications |
| Input bias current cancellation | ±1 nA max bias current without external resistor; prevents added Johnson noise and offset errors in high-Z pH or thermocouple circuits |
| Independent quad topology | Zero interaction between channels during overload or slewing; critical for simultaneous sampling in multi-channel DAQ |
| EMI rejection ratio (EMIRR) | High immunity to RF rectification at noninverting input; maintains offset stability in noisy factory environments with motor drives |
Applications
| Analog Input Module | Weigh Scale |
|---|---|
Use Scenario: Signal conditioning of 4–20 mA current loop outputs and bridge sensor mV signals in PLC analog input cards. IC Role / Device Role / Timing Role: Quad OPA4277UA/2K5G4 provides four independent, low-drift buffers and programmable-gain stages before 24-bit ADC conversion. Use Value: Enables 16-bit effective resolution over 20-year product lifetime without recalibration due to <0.1 µV/°C drift and 0.2 µV/month long-term stability. |
Use Scenario: Amplification of microvolt-level output from strain gauge load cells in platform or hopper scales. IC Role / Device Role / Timing Role: OPA4277UA/2K5G4 serves as first-stage instrumentation amplifier with matched input pairs (pins 2/3, 5/6, etc.) minimizing thermal EMF errors. Use Value: Achieves <10 ppm linearity error over 0–50°C ambient range using only its intrinsic offset stability - no cold-junction compensation required. |
| Temperature Transmitter | Pressure Transmitter |
Use Scenario: Linearization and amplification of RTD or thermocouple signals in 2-wire 4–20 mA field transmitters. IC Role / Device Role / Timing Role: OPA4277UA/2K5G4 configures as constant-current source for RTD excitation and low-noise difference amplifier for ratiometric measurement. Use Value: 0.22 µVPP (0.1–10 Hz) noise floor resolves <0.01°C increments in Class A Pt100 measurements without averaging. |
Use Scenario: Conditioning of millivolt output from piezoresistive pressure sensors in HVAC and process control systems. IC Role / Device Role / Timing Role: Quad OPA4277UA/2K5G4 implements zero/span adjustment, temperature compensation, and output drive for 4–20 mA loop. Use Value: 140 dB CMRR rejects common-mode noise from shared 24 VDC power bus, ensuring ±0.05% FS accuracy in electrically noisy plants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4188AIDR | Zero-drift auto-zero architecture; 0.005 µV/°C drift vs. OPA4277UA/2K5G4's ±0.1 µV/°C; higher 1/f noise (0.35 µVPP) | Better for ultra-stable DC offsets over decades; less suitable for low-noise AC-coupled sensor front-ends | Choose OPA4188AIDR when long-term calibration stability dominates over wideband noise performance |
| AD8628ARUZ-REEL | Chopper-stabilized; 0.002 µV/°C drift; 0.5 µVPP 0.1–10 Hz noise; limited bandwidth (2.5 MHz GBW vs. 1 MHz) | Superior drift specs but introduces switching artifacts; requires careful filtering in sensitive analog paths | Prefer AD8628ARUZ-REEL only where sub-µV/decade drift is mandatory and 100 kHz signal content is absent |
Compared with OPA4188AIDR and AD8628ARUZ-REEL, the OPA4277UA/2K5G4 offers the optimal balance of ultra-low drift, low broadband noise, absence of chopper artifacts, and proven robustness in industrial 4–20 mA loop designs - making it the preferred choice for general-purpose high-precision analog input modules.
Availability
OPA4277UA/2K5G4 is available at Aetrix Electronics and suitable for analog input modules, weigh scales, and temperature transmitters requiring stable component supply with full traceability and long-lifecycle support.
Supply support for OPA4277UA/2K5G4 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 delivering analog and embedded processing solutions, with over 50 years of precision op amp innovation and manufacturing excellence.
The OPAx277 product line was engineered specifically for high-accuracy industrial measurement systems - replacing OP-177 with superior noise, speed, and quiescent current while maintaining pin compatibility and ease of use in legacy designs.
FAQ
What is the maximum operating supply voltage for OPA4277UA/2K5G4?
The OPA4277UA/2K5G4 supports dual-supply operation 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 specifications - including CMRR, PSRR, and AOL - are fully guaranteed without derating.
Does OPA4277UA/2K5G4 require external offset trim?
No - the OPA4277UA/2K5G4 does not provide external offset trim pins. Only the single-channel OPA277 includes trim pins (1 and 8). The OPA4277UA/2K5G4 is laser-trimmed at wafer level to achieve ±10 µV max input offset voltage, and user adjustment is neither supported nor necessary for typical applications.
Can OPA4277UA/2K5G4 drive capacitive loads?
Yes - the OPA4277UA/2K5G4 can safely drive up to 1500 pF without oscillation, as confirmed by small-signal step response testing (Figure 6-22). For loads >1000 pF, add a 10–50 Ω series resistor between output and capacitance to maintain phase margin and prevent peaking.
What is the thermal resistance (θJA) of OPA4277UA/2K5G4 in SOIC package?
The junction-to-ambient thermal resistance (θJA) for OPA4277UA/2K5G4 in 14-pin SOIC (D package) is 86.5°C/W, measured per JEDEC JESD51-2 with 2 oz copper, 2-layer board, and no airflow. This value assumes standard PCB layout with thermal vias under exposed pad if present - though the SOIC variant lacks an exposed thermal pad.
Is OPA4277UA/2K5G4 suitable for battery-powered applications?
Yes - with only 800 µA per amplifier (3.2 mA total for all four channels), the OPA4277UA/2K5G4 enables precision signal conditioning in portable or loop-powered devices. Its ±2 V minimum supply allows operation from two AA cells (3 V) in single-supply configurations using rail-splitter or charge-pump biasing.
OPA4277UA/2K5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
OPA4277UA/2K5G4 FAQ
1.How can I place an order for OPA4277UA/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4277UA/2K5G4 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 OPA4277UA/2K5G4 reliable?
The price and inventory of OPA4277UA/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4277UA/2K5G4 is usually 5 days.
3.What payment methods are accepted for OPA4277UA/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4277UA/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4277UA/2K5G4?
OPA4277UA/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4277UA/2K5G4 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 OPA4277UA/2K5G4?
For technical support, including OPA4277UA/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4277UA/2K5G4 requirements.
6.How does Aetrix verify that OPA4277UA/2K5G4 is sourced from the original manufacturer or authorized distributors?
All OPA4277UA/2K5G4 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 OPA4277UA/2K5G4 meets industry standards.
7.What is the process for return or replacement of OPA4277UA/2K5G4?
All OPA4277UA/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA4277UA/2K5G4, 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 OPA4277UA/2K5G4 part is unused and in its original packaging.
Return procedure for OPA4277UA/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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