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Texas Instruments OPA2277U/2K5G4
- Part No.:
- OPA2277U/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2277U/2K5G4.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,446
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Product details
Overview
OPA2277U/2K5G4 from Texas Instruments is a dual-channel, high-precision operational amplifier designed for low-drift, low-noise signal conditioning in demanding 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 use in precision bridge amplifiers, strain gage interfaces, and battery-powered instrumentation.
For engineers reviewing the OPA2277U/2K5G4 datasheet, OPA2277U/2K5G4 pinout, OPA2277U/2K5G4 application, or OPA2277U/2K5G4 equivalent, key selection criteria include its ultralow 0.22 µVPP (0.1–10 Hz) noise, 140 dB CMRR, 130 dB PSRR, dual-channel independence, and SOIC-8 packaging with verified thermal performance (RθJA = 107.4 °C/W).
Technical Context
The OPA2277U/2K5G4 employs a laser-trimmed, bipolar-input architecture optimized for DC precision and low-frequency stability. Its fully differential input stage achieves ultralow offset and drift while maintaining high common-mode and power supply rejection across ±5 V to ±15 V operation - a single specification range covering most industrial and test equipment supply rails.
Unlike legacy OP-177 derivatives, it integrates internal bias current cancellation, eliminating need for external compensation resistors. Dual-channel isolation ensures <0.1 µV/V channel separation at DC, and unity-gain stability supports direct use in integrators, transducer buffers, and closed-loop sensor interfaces without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | ±10 µV max (high-grade dual) - enables sub-16-bit accuracy in 24-bit ADC front-ends without calibration |
| Offset Drift | ±0.1 µV/°C max - ensures <1 µV total drift over –40°C to +85°C operating range |
| 0.1–10 Hz Noise | 0.22 µVPP - critical for precision DC measurements like temperature or load cell outputs |
| Open-Loop Gain | 134 dB min - supports >100 ppm gain accuracy in high-precision instrumentation amplifiers |
| CMRR / PSRR | 140 dB / 130 dB min - rejects power supply ripple and common-mode interference in noisy industrial environments |
| Supply Range | ±2 V to ±18 V - compatible with both low-voltage portable systems and high-dynamic-range industrial rails |
| Quiescent Current | 800 µA per amplifier - allows dual-channel precision operation within 1.6 mA total, ideal for battery-powered meters |
Pinout & Package
OPA2277U/2K5G4 is packaged in an 8-pin SOIC (3.91 mm × 4.90 mm) with exposed thermal pad connected to V−. Pinout supports independent dual amplifiers with no shared internal nodes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Out A | Amplifier A output - drives loads up to ±35 mA; rail-to-rail swing limited by supply (V−)+1.5 V to (V+)-1.5 V |
| 2 | –In A | Inverting input A - high-impedance (250 GΩ || 3 pF), protected by 1-kΩ series resistor and diode clamps |
| 3 | +In A | Noninverting input A - matched impedance to –In A; thermally balanced layout required for <0.1 µV/°C drift |
| 4 | V− | Negative supply - connects to thermal pad; must be low-impedance ground path for stable 107.4 °C/W RθJA |
| 5 | +In B | Noninverting input B - electrically isolated from Channel A; enables dual-sensor simultaneous acquisition |
| 6 | –In B | Inverting input B - identical specs to –In A; channel separation >140 dB prevents crosstalk in multi-channel systems |
| 7 | Out B | Amplifier B output - fully independent; supports separate feedback networks without interaction |
| 8 | V+ | Positive supply - decoupling capacitor (0.1 µF) required near pin for high-PSRR operation |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed offset & drift | Eliminates need for manual nulling in production systems; maintains ±10 µV / ±0.1 µV/°C over life |
| Internal bias current cancellation | Reduces need for external Rcomp; achieves ±1 nA max input bias current without added components |
| Dual-channel independence | Guarantees <0.1 µV/V DC channel separation - essential for simultaneous multi-sensor measurement |
| Unity-gain stable & phase-inversion free | Enables direct use in voltage followers and integrators without risk of oscillation or output reversal |
| Robust input protection | Withstands ±30 V differential input; 1-kΩ series resistors + diodes prevent damage during sensor fault conditions |
Applications
| Transducer Amplification | Bridge Signal Conditioning |
|---|---|
|
Use Scenario: Amplifying mV-level outputs from pressure, force, or acceleration transducers in industrial control systems. IC Role / Device Role / Timing Role: Primary signal gain stage with DC-coupled, low-drift amplification before ADC sampling. Use Value: 10 µV offset and 0.22 µVPP (0.1–10 Hz) noise preserve microvolt-level resolution in 24-bit data acquisition. |
Use Scenario: Condition full-bridge or half-bridge outputs (e.g., load cells, torque sensors) requiring high common-mode rejection. IC Role / Device Role / Timing Role: Instrumentation-grade difference amplifier with matched dual channels for ratiometric sensing. Use Value: 140 dB CMRR and <0.1 µV/V channel separation reject supply noise and enable true differential measurement. |
| Precision Temperature Sensing | Battery-Powered Test Equipment |
|
Use Scenario: Linearizing and amplifying outputs from RTDs or thermistors in environmental monitoring systems. IC Role / Device Role / Timing Role: Low-drift, low-power front-end buffer and gain stage interfacing to precision ADCs. Use Value: ±0.1 µV/°C drift ensures <0.01°C error contribution over 85°C range; 800 µA/channel enables multi-day battery life. |
Use Scenario: Portable multimeters, handheld calibrators, and field service analyzers requiring lab-grade accuracy. IC Role / Device Role / Timing Role: Core analog signal conditioner supporting autoranging, auto-zero, and low-noise measurement modes. Use Value: Wide ±2 V to ±18 V supply range accommodates both Li-ion (±3.6 V) and 9-V battery rails; 130 dB PSRR suppresses battery ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2189IDR | Lower 0.1–10 Hz noise (0.1 µVPP), higher GBW (12 MHz), but higher quiescent current (1.3 mA/amplifier) | Better for wideband precision applications (e.g., fast-settling data acquisition); less suitable for ultra-low-power designs | Choose OPA2189IDR when bandwidth >1 MHz and noise <0.15 µVPP are required; retain OPA2277U/2K5G4 for sub-1 MHz, <1.6 mA total power budgets |
| AD8629ARZ | Zero-drift architecture (0.005 µV/°C), lower offset (1 µV max), but narrower supply range (±2.5 V to ±16 V) and higher cost | Ideal for zero-drift-critical applications (e.g., medical ECG front-ends); less tolerant of supply variation than OPA2277U/2K5G4 | Choose AD8629ARZ only when drift <0.01 µV/°C is mandatory; OPA2277U/2K5G4 remains optimal for general-purpose industrial precision with proven SOIC-8 reliability |
Compared with OPA2189IDR and AD8629ARZ, the OPA2277U/2K5G4 offers the best balance of ultralow drift (±0.1 µV/°C), industry-standard SOIC-8 footprint, 800 µA/channel quiescent current, and robust ±18 V operation - making it the preferred choice for cost-sensitive, high-reliability industrial instrumentation where moderate bandwidth suffices.
Availability
OPA2277U/2K5G4 is available at Aetrix Electronics and suitable for precision transducer amplification, bridge signal conditioning, temperature measurement systems, and battery-powered test equipment requiring stable component supply across extended product lifecycles.
Supply support for OPA2277U/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 deep expertise in precision analog design and high-volume manufacturing reliability.
The OPA2277U/2K5G4 belongs to TI's OPAx277 precision op-amp family, engineered specifically to replace OP-177 in industrial, test, and measurement applications demanding ultralow drift, low noise, and guaranteed performance across wide supply and temperature ranges.
FAQ
What is the maximum supply voltage for OPA2277U/2K5G4?
The OPA2277U/2K5G4 supports an absolute maximum supply voltage of ±18 V (36 V total), with recommended operation from ±2 V to ±15 V. At ±18 V, all electrical specifications remain valid per the datasheet's Recommended Operating Conditions table, and thermal performance (RθJA = 107.4 °C/W) ensures safe operation under typical PCB layouts with standard copper pour.
Does OPA2277U/2K5G4 require external offset trim?
No - the OPA2277U/2K5G4 is laser-trimmed to deliver ±10 µV max input offset voltage and does not require external trimming for most applications. While pins 1 and 8 provide offset adjust capability (as documented in Figure 24 of SBOS079B), TI explicitly states that user adjustment is "usually not required"; external trim should only be used to null residual op-amp offset, not system-level errors.
Can OPA2277U/2K5G4 drive capacitive loads?
Yes - the OPA2277U/2K5G4 can safely drive capacitive loads up to 1500 pF without instability, as verified in Figure 19 (Small-Signal Overshoot vs Load Capacitance) and Figure 22 (Small-Signal Step Response with CL = 1500 pF). For loads >1500 pF, external isolation resistance (e.g., 10–50 Ω in series with the output) is recommended to maintain phase margin.
What is the input voltage range of OPA2277U/2K5G4?
The OPA2277U/2K5G4 features a common-mode input voltage range of (V−)+2 V to (V+)-2 V - meaning it cannot operate with inputs within 2 V of either rail. This rail-to-rail exclusion is consistent across –40°C to +85°C and enables high CMRR (140 dB) by avoiding input stage saturation. Input protection diodes clamp beyond this range, allowing ±30 V differential tolerance without damage.
How does OPA2277U/2K5G4 compare to OP-177?
The OPA2277U/2K5G4 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, lower 0.1–10 Hz noise (0.22 µVPP vs 0.35 µVPP), and guaranteed specs over ±5 V to ±15 V - whereas OP-177 is specified only at ±15 V. Both share SOIC-8 compatibility and pinout, enabling drop-in upgrades.
OPA2277U/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:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 0.8V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 500 pA
- Voltage - Input Offset:
- 10 µV
- Current - Supply:
- 790µA (x2 Channels)
- 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
OPA2277U/2K5G4 FAQ
1.How can I place an order for OPA2277U/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2277U/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 OPA2277U/2K5G4 reliable?
The price and inventory of OPA2277U/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2277U/2K5G4 is usually 5 days.
3.What payment methods are accepted for OPA2277U/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2277U/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2277U/2K5G4?
OPA2277U/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2277U/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 OPA2277U/2K5G4?
For technical support, including OPA2277U/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2277U/2K5G4 requirements.
6.How does Aetrix verify that OPA2277U/2K5G4 is sourced from the original manufacturer or authorized distributors?
All OPA2277U/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 OPA2277U/2K5G4 meets industry standards.
7.What is the process for return or replacement of OPA2277U/2K5G4?
All OPA2277U/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2277U/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 OPA2277U/2K5G4 part is unused and in its original packaging.
Return procedure for OPA2277U/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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