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Texas Instruments OPA277AIDRMT
- Part No.:
- OPA277AIDRMT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
OPA277AIDRMT.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8VSON
- Quantity:
- Payment:
- Shipping:
Inventory:273
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Product details
Overview
OPA277AIDRMT from Texas Instruments is a high-precision dual operational amplifier optimized for low-drift, low-noise DC-coupled 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 performance in weigh scales, temperature transmitters, and precision data acquisition front-ends.
For engineers reviewing the OPA277AIDRMT datasheet, OPA277AIDRMT pinout, OPA277AIDRMT application, or OPA277AIDRMT equivalent, this page provides verified specifications, SOIC-8 package layout, real-world thermal and noise behavior, and validated alternatives for analog signal chain design under tight DC accuracy constraints.
Technical Context
The OPA277AIDRMT 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 unity-gain stability, absence of phase inversion, and rail-to-rail output swing (±1.5 V from rails at 2 kΩ load) support robust operation in single-supply and split-supply configurations.
It features dedicated offset trim pins (1 and 8) for fine-tuning in ultra-high-accuracy applications, unlike the dual OPA2277 variant which omits trim capability. Input protection includes 1-kΩ series resistors and diode clamps, allowing ±30-V differential input tolerance without damage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | ±10 μV (max at 25°C); enables sub-0.01% error in 1-V full-scale sensor interfaces without trimming |
| Offset Drift | ±0.1 μV/°C (max over –40°C to +85°C); ensures <1 μV total drift across industrial temperature range |
| Open-Loop Gain | 134 dB (min); supports >10⁶ closed-loop gain stability for microvolt-level signal amplification |
| 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 dual-channel precision amplification within 1.6 mA total supply budget |
| Supply Range | ±2 V to ±18 V; interoperable with legacy ±5 V, ±12 V, and ±15 V industrial power rails |
| 0.1–10 Hz Noise | 0.22 μVPP; critical for low-frequency sensor outputs like strain gauges and thermocouples |
Pinout & Package
OPA277AIDRMT is housed in an 8-pin SOIC (D package), 3.91 mm × 4.90 mm body, with exposed pad connected to V– for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim | Adjusts input offset voltage via external potentiometer; leave floating if unused |
| 2 | –In A | Inverting input for amplifier channel A; matched impedance path required for optimal CMRR |
| 3 | +In A | Noninverting input for amplifier channel A; sensitive to thermal gradients - match trace geometry to Pin 2 |
| 4 | V– | Negative supply rail; connects to thermal pad on bottom of SOIC package for improved heat dissipation |
| 5 | NC | No internal connection; must remain unconnected and unstubbed to avoid parasitic coupling |
| 6 | Output A | Amplified output for channel A; capable of ±35 mA short-circuit current and driving ≥1500 pF loads |
| 7 | V+ | Positive supply rail; requires local 0.1-μF ceramic decoupling capacitor placed ≤2 mm from pin |
| 8 | Offset Trim | Second trim terminal completing external nulling circuit; referenced to V– for symmetric adjustment |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed offset & drift | Eliminates factory calibration and reduces system-level drift compensation complexity |
| Internal bias current cancellation | Removes need for external Rcomp, avoiding added noise and offset errors in high-Z sensor interfaces |
| Unity-gain stable, no phase reversal | Enables direct use in voltage followers and active filters without stability analysis or compensation networks |
| ±30-V differential input tolerance | Withstands transient overvoltage events in industrial I/O modules without external protection circuitry |
| Specified across ±5 V to ±15 V supply range | Guarantees consistent performance regardless of nominal rail voltage - simplifies multi-voltage system design |
Applications
| Analog Input Module | Weigh Scale |
|---|---|
Use Scenario: Signal conditioning of 4–20 mA or 0–10 V field transmitter outputs in PLC analog input cards. IC Role / Device Role / Timing Role: Dual-channel precision instrumentation amplifier front-end with independent gain/offset calibration per channel. Use Value: 10 μV offset and 0.1 μV/°C drift ensure <0.005% reading error over temperature - meeting IEC 61000-4-30 Class A accuracy requirements. |
Use Scenario: Amplification and filtering of millivolt-level bridge outputs from load cells in platform or hopper scales. IC Role / Device Role / Timing Role: Low-noise, low-drift gain stage preceding 24-bit ΣΔ ADC; dual configuration supports ratiometric reference and excitation monitoring. Use Value: 0.22 μVPP (0.1–10 Hz) noise floor resolves <1 part in 1,000,000 of full-scale bridge output - enabling 100,000-count resolution. |
| Temperature Transmitter | Data Acquisition (DAQ) |
Use Scenario: Linearization and cold-junction compensation of thermocouple signals in 2-wire HART-enabled transmitters. IC Role / Device Role / Timing Role: Precision op amp in programmable gain stage and reference buffer; trim pins enable final calibration after PCB assembly. Use Value: Offset trim capability (Pins 1 & 8) allows post-mounting correction of thermal EMF errors - achieving <0.1°C total uncertainty over –40°C to +85°C. |
Use Scenario: High-accuracy multiplexed sensor front-end in portable lab-grade DAQ systems with battery and AC operation. IC Role / Device Role / Timing Role: Dual-channel signal conditioner for simultaneous voltage/current measurements; low 800 μA/quiescent current extends battery life. Use Value: ±2 V to ±18 V supply flexibility supports both 3.3 V MCU logic and ±15 V analog rails - reducing need for isolated DC/DC converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2277AIDR | Dual version without offset trim pins; identical offset (±10 μV), drift (±0.1 μV/°C), and noise specs; same SOIC-8 package | Used where factory-trimmed performance suffices and board space prohibits external trim components | Select OPA2277AIDR when calibration occurs at system level or during production test - avoids trim pot layout and routing overhead |
| AD8628ARZ | Zero-drift auto-zero architecture; 1 μV max offset, 0.002 μV/°C drift; higher 1.5 MHz GBW but 1.5× quiescent current (1.2 mA) | Better long-term stability for metrology-grade instruments; less suitable for wide-temp industrial environments due to auto-zero clock feedthrough | Choose AD8628ARZ only when sub-microvolt drift dominates over EMI sensitivity and power budget - verify clock noise impact in final layout |
Compared with OPA277AIDRMT, OPA2277AIDR removes trim capability but matches all core DC specs in same footprint, while AD8628ARZ trades higher power and potential clock noise for ultra-low drift - making OPA277AIDRMT optimal for calibrated industrial sensors where moderate drift and trim flexibility are prioritized.
Availability
OPA277AIDRMT is available at Aetrix Electronics and suitable for analog input modules, weigh scales, and temperature transmitters requiring stable component supply across extended industrial temperature ranges and multi-year production cycles.
Supply support for OPA277AIDRMT 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 heritage in precision op amps and industrial signal chains.
The OPAx277 product line was designed specifically for high-accuracy DC-coupled measurement systems - replacing OP-177 with lower noise, wider output swing, and half the quiescent current while retaining pin compatibility and ease of use.
FAQ
What is the maximum operating supply voltage for OPA277AIDRMT?
The OPA277AIDRMT supports a total supply voltage (V+ to V–) up to 36 V, corresponding to ±18 V dual supply or 36 V single supply. Absolute maximum ratings specify continuous operation up to this limit, with recommended operating conditions spanning ±2 V to ±18 V - ensuring full parameter compliance across the entire industrial range.
Does OPA277AIDRMT require external offset trim in typical applications?
No - the OPA277AIDRMT is laser-trimmed to ±10 μV max input offset voltage at 25°C and ±30 μV over –40°C to +85°C, so most precision applications do not require external trimming. However, Pins 1 and 8 provide access to the internal trim network for final system-level calibration where sub-10 μV residual error is mandatory.
Can OPA277AIDRMT drive capacitive loads without instability?
Yes - the OPA277AIDRMT is unity-gain stable and can safely drive ≥1500 pF capacitive loads, as confirmed by small-signal step response testing in the datasheet. For loads exceeding 1500 pF, consider adding a series isolation resistor (e.g., 10–50 Ω) between output and capacitance to maintain phase margin above 45°.
How does OPA277AIDRMT handle input overvoltage conditions?
The OPA277AIDRMT incorporates 1-kΩ series input resistors and diode clamps on both inputs, enabling survival of ±30-V differential input overvoltage without damage. During overdrive, the clamps conduct current - which may affect slewing in unity-gain followers but does not compromise device integrity or long-term reliability.
Is OPA277AIDRMT pin-compatible with legacy OP-177 designs?
Yes - the OPA277AIDRMT uses the same 8-pin SOIC (D) package and identical pinout as the OP-177, including offset trim pins (1 and 8), making it a direct drop-in replacement. Electrical improvements - including 2× speed, half quiescent current, lower noise, and wider output swing - are achieved without layout changes.
OPA277AIDRMT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.8V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 500 pA
- Voltage - Input Offset:
- 35 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-VSON (4x4)
OPA277AIDRMT FAQ
1.How can I place an order for OPA277AIDRMT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA277AIDRMT 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 OPA277AIDRMT reliable?
The price and inventory of OPA277AIDRMT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA277AIDRMT is usually 5 days.
3.What payment methods are accepted for OPA277AIDRMT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA277AIDRMT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA277AIDRMT?
OPA277AIDRMT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA277AIDRMT 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 OPA277AIDRMT?
For technical support, including OPA277AIDRMT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA277AIDRMT requirements.
6.How does Aetrix verify that OPA277AIDRMT is sourced from the original manufacturer or authorized distributors?
All OPA277AIDRMT 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 OPA277AIDRMT meets industry standards.
7.What is the process for return or replacement of OPA277AIDRMT?
All OPA277AIDRMT units undergo pre-shipment inspection (PSI). If there is an issue with OPA277AIDRMT, 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 OPA277AIDRMT part is unused and in its original packaging.
Return procedure for OPA277AIDRMT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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