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Texas Instruments OPA2277UG4
- Part No.:
- OPA2277UG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2277UG4.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,691
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Product details
Overview
OPA2277UG4 from Texas Instruments is a dual-channel, high-precision operational amplifier designed for low-drift, low-noise signal conditioning in precision 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 battery-powered instrumentation and industrial sensor interfaces.
For engineers reviewing the OPA2277UG4 datasheet, OPA2277UG4 pinout, OPA2277UG4 application, or OPA2277UG4 equivalent, key selection considerations include its dual-channel independence (no crosstalk), 0.1–10 Hz noise of 0.22 µVPP, ±1 nA max input bias current, and compatibility with transducer, bridge, and strain gage amplifier topologies requiring sub-µV-level DC accuracy.
Technical Context
The OPA2277UG4 employs a laser-trimmed bipolar input stage with internal bias current cancellation, achieving ultralow drift without external trimming in most applications. Its unity-gain stability, absence of phase inversion, and rail-to-rail output swing (within 1.5 V of rails at ±15 V) support direct interfacing with ADCs and precision integrators.
Unlike legacy OP-177 derivatives, the OPA2277UG4 maintains specified performance across ±5 V to ±15 V supply range - not just at nominal voltage - and guarantees 140 dB CMRR and 130 dB PSRR over –40°C to +85°C, making it suitable for noisy industrial environments where supply and common-mode rejection are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | ±10 µV max - enables DC-coupled amplification of µV-level sensor signals without nulling circuitry |
| Offset Drift | ±0.1 µV/°C max - ensures <1 µV total drift over 85°C temperature span, critical for unattended measurement systems |
| Open-Loop Gain | 134 dB min - provides >5 million V/V loop gain, supporting 16-bit+ resolution in closed-loop configurations |
| CMRR / PSRR | 140 dB / 130 dB min - rejects >100 million-fold common-mode or supply noise, essential in single-supply-derived bipolar systems |
| 0.1–10 Hz Noise | 0.22 µVPP - supports high-resolution DC measurements in weigh scales, thermopile, and RTD interfaces |
| Supply Range | ±2 V to ±18 V - allows operation from low-power ±3 V rails up to industrial ±15 V, with full spec compliance from ±5 V |
| Quiescent Current | 800 µA per amplifier - enables dual-channel precision amplification in battery-powered handheld test equipment |
Pinout & Package
OPA2277UG4 is housed in an 8-pin SOIC (D) package (3.91 mm × 4.90 mm), with exposed thermal pad connected to V− for improved thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Out A | Output channel A | Low-impedance buffered output; capable of ±35 mA short-circuit current and driving ≥2 kΩ loads |
| 2 - –In A | Inverting input channel A | Differential input node with 250 GΩ || 3 pF common-mode impedance; protected by 1-kΩ series resistors |
| 3 - +In A | Noninverting input channel A | Differential input node matched to Pin 2; thermally balanced layout required to preserve <0.1 µV/°C drift |
| 4 - V− | Negative supply rail | Reference for both amplifiers; thermal pad must be soldered to PCB ground plane or V− plane |
| 5 - +In B | Noninverting input channel B | Independent input for second amplifier; no electrical or thermal coupling to channel A inputs |
| 6 - –In B | Inverting input channel B | Fully isolated input path; enables true dual-channel operation with <0.1 µV/V channel separation |
| 7 - Out B | Output channel B | Electrically and thermally isolated output; supports independent gain/feedback networks per channel |
| 8 - V+ | Positive supply rail | High-side supply connection; decoupling capacitor (0.1 µF) required within 5 mm of this pin |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow offset drift | ±0.1 µV/°C max ensures long-term calibration stability in environmental monitoring systems |
| Unity-gain stable | No external compensation needed - simplifies design of gain-of-1 buffers for ADC drivers and reference buffers |
| No phase inversion | Eliminates output polarity reversal during input overdrive - prevents latch-up in closed-loop control loops |
| Independent dual channels | Zero crosstalk between channels enables simultaneous differential sensing (e.g., two half-bridges) |
| Input protection | ±30 V differential input tolerance with internal 1-kΩ series resistors and diode clamps - protects against ESD and transient overvoltage |
Applications
| Transducer Amplifier | Bridge Amplifier |
|---|---|
Use Scenario: Amplifying low-level mV outputs from pressure, flow, or load-cell transducers in factory automation systems. IC Role / Device Role / Timing Role: Primary DC-coupled gain stage with sub-µV offset and drift, directly interfacing transducer to 24-bit sigma-delta ADC. Use Value: Enables 0.005% full-scale accuracy over temperature without recalibration, reducing field service costs. | Use Scenario: Signal conditioning for Wheatstone bridge sensors in precision weighing and structural health monitoring. IC Role / Device Role / Timing Role: Instrumentation-grade difference amplifier with matched input impedances and 140 dB CMRR. Use Value: Rejects bridge excitation ripple and common-mode noise, delivering 20-bit effective resolution in noisy plant-floor environments. |
| Temperature Measurement | Strain Gage Amplifier |
Use Scenario: Linearizing and amplifying thermocouple or RTD signals in medical diagnostic equipment. IC Role / Device Role / Timing Role: Cold-junction compensation amplifier and programmable gain stage with ultra-low 1/f noise. Use Value: Achieves ±0.1°C accuracy over –40°C to +85°C using only passive components, eliminating digital correction firmware. | Use Scenario: High-gain amplification of microstrain signals from bonded foil or semiconductor strain gages in aerospace test rigs. IC Role / Device Role / Timing Role: Low-drift, low-noise front-end with 0.22 µVPP 0.1–10 Hz noise and 134 dB AOL for feedback stability. Use Value: Resolves sub-100-nε mechanical strain without averaging, accelerating fatigue testing throughput by 3×. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2188AIDR | Zero-drift auto-zero architecture; 0.003 µV/°C drift vs OPA2277UG4's ±0.1 µV/°C; higher 1/f noise (0.1 µVPP) but lower broadband noise (5.6 nV/√Hz) | Better for DC-critical apps with wide temperature swings; less suitable for low-frequency AC signals due to auto-zero switching artifacts | Select OPA2188AIDR when drift dominates error budget; choose OPA2277UG4 for pure low-noise analog signal chains with minimal digital interference |
| AD8628ARZ | Chopper-stabilized; 0.5 µV max offset, 0.002 µV/°C drift; higher quiescent current (1.2 mA) and limited supply range (±2.5 V to ±18 V) | Superior long-term stability but introduces 50 kHz switching noise; requires additional filtering in sensitive audio or sensor paths | Prefer AD8628ARZ for ultra-long-term calibration hold; retain OPA2277UG4 where clean spectral content below 100 kHz is mandatory |
Compared with OPA2188AIDR and AD8628ARZ, the OPA2277UG4 offers the optimal balance of ultralow 1/f noise, zero switching artifacts, and proven bipolar-linearity - making it preferred for metrology-grade DC amplification where spectral purity and monotonicity outweigh absolute drift minimization.
Availability
OPA2277UG4 is available at Aetrix Electronics and suitable for transducer amplification, bridge sensing, temperature measurement, and strain gage applications requiring stable component supply across industrial, medical, and test equipment lifecycles.
Supply support for OPA2277UG4 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 leadership in precision op-amps and data converters.
The OPA2277UG4 belongs to TI's OPAx277 precision op-amp family, engineered specifically for high-accuracy DC signal conditioning in industrial process control, scientific instrumentation, and calibration-grade test equipment.
FAQ
What is the maximum operating supply voltage for OPA2277UG4?
The OPA2277UG4 supports a total supply voltage range of ±2 V to ±18 V (36 V total), with guaranteed specifications over ±5 V to ±15 V. Absolute maximum rating is ±18 V - exceeding this risks permanent damage. Operation at ±18 V is permissible but requires verification of thermal dissipation and output swing limits per the datasheet's thermal metrics (RθJA = 107.4°C/W for SOIC).
Does OPA2277UG4 require external offset trim in typical applications?
No - the OPA2277UG4 is laser-trimmed to ±10 µV max input offset voltage and ±0.1 µV/°C drift, eliminating the need for external trimming in most precision applications. Pins 1 and 8 provide offset adjust capability only for special cases (e.g., system-level nulling); using them for op-amp-only nulling may introduce additional thermal drift and is discouraged unless validated per Figure 24 in the SBOS079B datasheet.
Can OPA2277UG4 drive capacitive loads without oscillation?
Yes - the OPA2277UG4 is unity-gain stable and can safely drive ≥1500 pF capacitive loads without external isolation resistance, as verified in Figure 19 of SBOS079B. For loads >1500 pF or in high-EMI environments, adding a 10–50 Ω series resistor at the output improves phase margin. The device's open-loop output impedance remains low (<40 Ω at 1 MHz), supporting robust driving of ADC input capacitors and coaxial cables.
How does OPA2277UG4 handle input overvoltage conditions?
The OPA2277UG4 features integrated 1-kΩ series input resistors and diode clamps on both inputs, allowing it to withstand ±30 V differential input voltage without damage. During overvoltage, clamping diodes conduct, which may temporarily affect slewing in unity-gain followers - but the amplifier recovers fully without latch-up or parameter shift. This protection eliminates need for external Schottky diodes in most industrial sensor interfaces.
Is OPA2277UG4 pin-compatible with older OP-177-based designs?
No - while the OPA2277UG4 replaces the OP-177 functionally and improves noise, speed, and quiescent current, its 8-pin SOIC pinout differs: OPA2277UG4 uses pins 1/7 for outputs (Out A/Out B), whereas OP-177 (dual version) uses pins 1/7 for offset trim. Direct replacement requires PCB layout revision. However, OPA2277UG4's identical electrical specs and enhanced performance make it a drop-in functional upgrade when board redesign is feasible.
OPA2277UG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
OPA2277UG4 FAQ
1.How can I place an order for OPA2277UG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2277UG4 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 OPA2277UG4 reliable?
The price and inventory of OPA2277UG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2277UG4 is usually 5 days.
3.What payment methods are accepted for OPA2277UG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2277UG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2277UG4?
OPA2277UG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2277UG4 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 OPA2277UG4?
For technical support, including OPA2277UG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2277UG4 requirements.
6.How does Aetrix verify that OPA2277UG4 is sourced from the original manufacturer or authorized distributors?
All OPA2277UG4 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 OPA2277UG4 meets industry standards.
7.What is the process for return or replacement of OPA2277UG4?
All OPA2277UG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2277UG4, 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 OPA2277UG4 part is unused and in its original packaging.
Return procedure for OPA2277UG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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