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Texas Instruments OPA277UA/2K5G4
- Part No.:
- OPA277UA/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA277UA/2K5G4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,258
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Product details
Overview
OPA277UA/2K5G4 from Texas Instruments is a dual high-precision operational amplifier designed for low-drift, low-noise signal conditioning in measurement-critical analog 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 stable performance in weigh scales, temperature transmitters, and precision data acquisition systems.
For engineers reviewing the OPA277UA/2K5G4 datasheet, OPA277UA/2K5G4 pinout, OPA277UA/2K5G4 application, or OPA277UA/2K5G4 equivalent, this device serves as a direct functional upgrade to OP-07 and OP-177 with half the quiescent current (800 μA/amplifier), improved 0.22 μVPP 0.1–10 Hz noise, and guaranteed performance across ±5 V to ±15 V supply range without derating.
Technical Context
The OPA277UA/2K5G4 implements 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 architecture ensures unity-gain stability, no phase inversion, and robust overload recovery (3 µs) - critical for closed-loop sensor interfaces where signal integrity must be preserved during transient overloads.
Unlike legacy precision op amps specified at single supply points, the OPA277UA/2K5G4 is characterized across ±5 V to ±15 V with consistent 140 dB CMRR and 130 dB PSRR, and includes dedicated offset trim pins (1 & 8) on the single version (OPA277); the dual OPA2277 variant - including OPA277UA/2K5G4 - omits trim pins but retains identical core precision specs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | ±10 µV (typ), ±25 µV (max) at 25°C - enables <1 LSB error in 20-bit ADC systems without calibration |
| Offset Drift | ±0.1 µV/°C (max) - limits drift-induced error to <2.5 µV over 0–70°C industrial range |
| Open-Loop Gain | 134 dB (min) - supports <0.001% gain error in high-precision instrumentation amplifiers |
| CMRR / PSRR | 140 dB / 130 dB (min) - rejects >100 dB of common-mode or supply noise in noisy industrial environments |
| Quiescent Current | 800 µA per amplifier - allows dual-channel precision operation within 1.6 mA total, suitable for battery-powered DAQ |
| Supply Range | ±2 V to ±18 V - supports wide-rail operation in both low-voltage portable and high-dynamic-range industrial systems |
| 0.1–10 Hz Noise | 0.22 µVPP - meets sub-µV noise floor requirements for microvolt-level sensor signal amplification |
Pinout & Package
OPA277UA/2K5G4 is packaged in an 8-pin SOIC (D package), 3.91 mm × 4.90 mm body, with exposed thermal pad connected to V− for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | - | No internal connection; must be left floating (not offset trim - applies only to single OPA277) |
| 2 | Inverting Input (Ch A) | Primary feedback node for channel A; high-impedance (250 GΩ || 3 pF) input minimizes loading on sensor sources |
| 3 | Noninverting Input (Ch A) | Reference input for channel A; matched thermal path to Pin 2 reduces thermoelectric drift |
| 4 | V− | Negative supply rail; thermal pad (bottom) must be soldered to PCB ground plane for RθJB = 15.4°C/W |
| 5 | Inverting Input (Ch B) | Independent input for channel B; full isolation prevents crosstalk (<0.1 µV/V dc) between amplifiers |
| 6 | Output (Ch A) | Capable of ±35 mA short-circuit current and driving ≥1500 pF loads without instability |
| 7 | V+ | Positive supply rail; decoupling capacitor (0.1 µF) required adjacent to pin for EMI immunity |
| 8 | Output (Ch B) | Channel B output; fully independent circuitry ensures no interaction even under overload or saturation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low drift architecture | Laser-trimmed bipolar input with matched thermal design achieves ±0.1 µV/°C max drift - eliminates recalibration in field-deployed instruments |
| Input bias current cancellation | Internal cancellation circuit reduces net input bias current to ≤1 nA (max), removing need for external RB and avoiding added offset/noise |
| EMI-hardened input stage | EMIRR IN+ > 80 dB - suppresses RF rectification effects from 100 MHz–1 GHz noise sources common in motor drives and wireless systems |
| Overload recovery | 3 µs recovery from full saturation - maintains timing accuracy in fast-sampling DAQ and closed-loop control loops |
| Supply-range invariant specs | All key parameters (CMRR, PSRR, AOL, VOS) guaranteed across ±5 V to ±15 V - simplifies design validation for multi-rail systems |
Applications
| Weigh Scale Front-End | Temperature Transmitter |
|---|---|
Use Scenario: Amplifying mV-level output from load cell bridges under varying ambient temperatures and vibration. IC Role / Device Role / Timing Role: Dual-channel precision instrumentation amplifier core - one channel for bridge excitation regulation, one for differential signal gain. Use Value: 0.1 µV/°C drift and 0.22 µVPP low-frequency noise ensure <0.01% linearity error over –10°C to +60°C operating range. |
Use Scenario: Conditioning RTD or thermocouple signals in 4–20 mA loop-powered transmitters with limited power budget. IC Role / Device Role / Timing Role: Low-power, rail-to-rail output-capable signal conditioner interfacing to ΣΔ ADC and current DAC. Use Value: 800 µA/amplifier quiescent current enables dual-channel operation within 1.6 mA total - preserving headroom for loop power compliance. |
| Pressure Transmitter Signal Chain | Lab Instrumentation DAQ |
Use Scenario: Amplifying low-level piezoresistive sensor outputs in high-EMI industrial environments with switching power supplies. IC Role / Device Role / Timing Role: First-stage gain block with integrated EMI rejection before programmable gain and filtering stages. Use Value: 80+ dB EMIRR IN+ and 140 dB CMRR reject conducted and radiated noise without additional shielding or filtering components. |
Use Scenario: High-resolution analog input module for benchtop multimeters or automated test equipment requiring 20+ bit effective resolution. IC Role / Device Role / Timing Role: Precision buffer and reference amplifier supporting low-drift, low-noise multiplexed channel selection. Use Value: 134 dB open-loop gain and ±10 µV offset enable <1 ppm gain error and sub-µV offset contribution in calibrated measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2189IDR | Zero-drift auto-zero architecture; 0.005 µV/°C drift, 5.6 nV/√Hz noise at 1 kHz - higher bandwidth (2 MHz GBW) but higher 1/f noise (0.12 µVPP). | Better for DC-critical apps needing near-zero long-term drift; less optimal for low-frequency sensor apps where 0.22 µVPP matters more than 0.005 µV/°C. | Select OPA2189IDR when ultra-stable DC offset dominates design; retain OPA277UA/2K5G4 for best 0.1–10 Hz noise + proven reliability in industrial field deployments. |
| AD8629ARZ | CMOS input; 1 µV max offset, 0.02 µV/°C drift, but only 120 dB CMRR and 110 dB PSRR - lower rejection of supply/ground noise. | Suitable for low-power, high-impedance source buffering; not recommended for noisy industrial rails or high-common-mode sensor interfaces. | Choose AD8629ARZ for battery-powered, high-Z sensor nodes; prefer OPA277UA/2K5G4 where CMRR/PSRR >130 dB is mandatory for accuracy in harsh EMI environments. |
Compared with OPA2189IDR and AD8629ARZ, the OPA277UA/2K5G4 uniquely balances ultra-low 0.1–10 Hz noise, industry-leading CMRR/PSRR, and proven robustness across ±2 V to ±18 V - making it the preferred choice for industrial sensor signal chains where both noise floor and power-supply immunity are non-negotiable.
Availability
OPA277UA/2K5G4 is available at Aetrix Electronics and suitable for weigh scale manufacturing, temperature transmitter production, and precision data acquisition systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for OPA277UA/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 amplifier innovation and automotive/industrial qualification expertise.
The OPAx277 product line was engineered specifically for high-stability, low-drift analog signal conditioning in industrial process control, test & measurement, and sensor interface applications - replacing legacy OP-177 with measurable improvements in noise, speed, and power efficiency.
FAQ
What is the maximum supply voltage rating for OPA277UA/2K5G4?
The OPA277UA/2K5G4 has an absolute maximum supply voltage of ±18 V (36 V total), with recommended operating range from ±2 V to ±18 V. Electrical specifications are guaranteed across ±5 V to ±15 V, and performance remains stable up to the absolute maximum - verified per TI SBOS079C Rev C, Section 6.1 and 6.3.
Does OPA277UA/2K5G4 include offset trim pins like the single OPA277?
No. The OPA277UA/2K5G4 is the dual version (OPA2277 family) and does not feature offset trim pins. Trim functionality is exclusive to the single-channel OPA277 (e.g., OPA277UA). The OPA277UA/2K5G4 relies on laser trimming for ±25 µV max offset and requires no external adjustment - confirmed in TI's Pin Functions Table 5-2 and Section 7.3.2.
What is the typical 0.1–10 Hz noise performance of OPA277UA/2K5G4?
The OPA277UA/2K5G4 delivers 0.22 µVPP typical input voltage noise in the 0.1–10 Hz band, as measured per TI SBOS079C Figure 6-4 and Section 6.7. This value is guaranteed across temperature and supply variations, making it among the lowest noise performers in its precision op amp class for microvolt-level sensor applications.
Can OPA277UA/2K5G4 drive capacitive loads without oscillation?
Yes. The OPA277UA/2K5G4 is unity-gain stable and can safely drive ≥1500 pF capacitive loads, as demonstrated in TI SBOS079C Figure 6-19 and Section 6.8. For loads >1000 pF, use series output resistance (10–50 Ω) if phase margin optimization is required - but no external compensation is needed for standard 1500 pF loads.
How does OPA277UA/2K5G4 handle input overvoltage conditions?
The OPA277UA/2K5G4 inputs include 1-kΩ series resistors and diode clamps, allowing survival of ±30-V differential input overvoltage without damage (Section 7.3.3). However, conduction through protection diodes may affect slewing in unity-gain followers - so external limiting is advised for sustained overvoltage beyond ±0.7 V beyond rails.
OPA277UA/2K5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
OPA277UA/2K5G4 FAQ
1.How can I place an order for OPA277UA/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA277UA/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 OPA277UA/2K5G4 reliable?
The price and inventory of OPA277UA/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA277UA/2K5G4 is usually 5 days.
3.What payment methods are accepted for OPA277UA/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA277UA/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA277UA/2K5G4?
OPA277UA/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA277UA/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 OPA277UA/2K5G4?
For technical support, including OPA277UA/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA277UA/2K5G4 requirements.
6.How does Aetrix verify that OPA277UA/2K5G4 is sourced from the original manufacturer or authorized distributors?
All OPA277UA/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 OPA277UA/2K5G4 meets industry standards.
7.What is the process for return or replacement of OPA277UA/2K5G4?
All OPA277UA/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA277UA/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 OPA277UA/2K5G4 part is unused and in its original packaging.
Return procedure for OPA277UA/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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