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Texas Instruments OPA277AIDRMR
- Part No.:
- OPA277AIDRMR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
OPA277AIDRMR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8VSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,834
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Product details
Overview
OPA277AIDRMR 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 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 analog input modules.
For engineers reviewing the OPA277AIDRMR datasheet, OPA277AIDRMR pinout, OPA277AIDRMR application, or OPA277AIDRMR equivalent, this page provides verified pin functions, real-world thermal metrics for the DRM (VSON-8) package, confirmed replacement guidance for OP-07/OP-177 legacy designs, and application-specific design meaning for noise, CMRR, and output swing parameters.
Technical Context
The OPA277AIDRMR implements a laser-trimmed bipolar input stage with internal bias current cancellation, eliminating need for external compensation resistors. Its input protection includes 1-kΩ series resistors and diode clamps, supporting ±30-V differential input tolerance without damage.
It is unity-gain stable and immune to phase inversion, with guaranteed performance across ±5 V to ±15 V supply range - not just at a single test voltage. Key specifications like CMRR (140 dB), PSRR (130 dB), and 0.22 µVPP 0.1–10 Hz noise are validated over –40°C to +85°C ambient temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset voltage | ±10 µV typ / ±20 µV max at 25°C - enables sub-16-bit accuracy without trimming in precision sensor front-ends |
| Drift | ±0.1 µV/°C max - ensures < ±1 µV total drift over 85°C industrial temperature range |
| Open-loop gain | 134 dB min - supports >120 dB closed-loop gain stability for high-resolution instrumentation amplifiers |
| CMRR | 140 dB min - rejects >100 dB of common-mode interference in bridge-sensor applications |
| Quiescent current | 800 µA per amplifier - allows dual-channel precision operation within 1.6 mA total, suitable for battery-backed DAQ |
| Supply range | ±2 V to ±18 V - interoperates with legacy ±15 V industrial rails and modern ±5 V low-power systems |
| 0.1–10 Hz noise | 0.22 µVPP - meets <0.5 µVPP requirement for 24-bit weigh scale reference stages |
Pinout & Package
The OPA277AIDRMR is housed in an 8-pin DRM (VSON) package measuring 4.00 mm × 4.00 mm with exposed thermal pad on bottom, connected to V– for optimal thermal dissipation (RθJA = 40.7°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Offset Trim) | Trim input | Connects to external potentiometer for fine offset nulling; leave floating if unused - only available on single OPA277, not dual OPA2277 |
| 2 (–In A) | Inverting input | Differential input node for channel A; protected by 1-kΩ resistor and clamp diodes |
| 3 (+In A) | Noninverting input | Differential input node for channel A; matched thermal path critical for low drift |
| 4 (V–) | Negative supply | Lowest potential rail; thermal pad must be soldered to PCB ground plane for RθJB = 16.7°C/W |
| 5 (NC) | No connection | Internally unconnected; may be left floating or tied to V– for mechanical stability |
| 6 (Out A) | Output | Capable of ±1.5 V swing into 2 kΩ load at ±15 V supplies; drives up to 1500 pF directly |
| 7 (V+) | Positive supply | Highest potential rail; requires local 0.1-µF ceramic decoupling adjacent to pin |
| 8 (Offset Trim) | Trim input | Second trim terminal for potentiometer center-wiper; forms balanced nulling network with Pin 1 |
Key Features
| Feature | Design Value |
|---|---|
| Input bias current cancellation | Eliminates need for external RB compensation resistor - avoids added offset error and Johnson noise |
| EMI rejection ratio (EMIRRIN+) | High immunity to RF rectification at noninverting input - preserves DC accuracy in noisy factory environments |
| Overvoltage input protection | ±30-V differential tolerance via integrated 1-kΩ resistors and clamps - prevents latch-up during sensor cable ESD events |
| Thermal drift optimization | Laser-trimmed topology with matched input metallization - minimizes thermoelectric EMF between +In/–In traces |
| Unity-gain stability | Guaranteed stable at G = 1 with no external compensation - simplifies design of buffer and integrator circuits |
Applications
| Analog Input Module | Weigh Scale |
|---|---|
Use Scenario: Signal conditioning of 4–20 mA or 0–10 V industrial process signals with galvanic isolation and anti-alias filtering. IC Role / Device Role / Timing Role: Dual-channel precision op amp providing programmable gain, offset correction, and low-noise buffering before ADC sampling. Use Value: 0.22 µVPP 0.1–10 Hz noise and 140 dB CMRR enable 16-bit effective resolution despite field wiring noise. | Use Scenario: Amplification and filtering of mV-level outputs from strain-gauge load cells in platform or hopper scales. IC Role / Device Role / Timing Role: Instrumentation-grade front-end amplifier with external offset trim capability for zero calibration. Use Value: ±0.1 µV/°C drift ensures < ±1 µV zero-point shift over full operating temperature range - eliminates recalibration. |
| Temperature Transmitter | Pressure Transmitter |
Use Scenario: Linearization and cold-junction compensation of thermocouple outputs in 4–20 mA loop-powered transmitters. IC Role / Device Role / Timing Role: Low-drift, low-power dual op amp implementing polynomial correction and current-loop drive circuitry. Use Value: 800 µA per amplifier enables full functionality within 3.5 mA loop budget while maintaining <1 µV offset drift. | Use Scenario: Conditioning of millivolt outputs from piezoresistive pressure sensors in HVAC or process control systems. IC Role / Device Role / Timing Role: High-PSRR (130 dB) dual amplifier rejecting supply ripple in battery- or loop-powered configurations. Use Value: 130 dB PSRR ensures <10 nV/V supply-induced error - critical for stable 0.1% FS accuracy under varying line conditions. |
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 | Zero-drift auto-zero architecture; 0.005 µV/°C drift vs OPA277AIDRMR's ±0.1 µV/°C; higher 5.6 MHz GBW | Superior long-term stability for metrology; less suitable for high-slew, wide-bandwidth sensor interfaces | Choose OPA2189IDR when drift-critical calibration intervals exceed 1 year; retain OPA277AIDRMR for proven bipolar-linearity in bridge amplifiers |
| AD8629ARZ | CMOS input; 1 pA bias current vs 1 nA; lower 1.5 µV offset but higher 0.25 µV/°C drift | Better for ultra-high-Z pH or photodiode sensors; inferior CMRR (130 dB) and PSRR (120 dB) | Choose AD8629ARZ for femtoampere-level input leakage; retain OPA277AIDRMR where 140 dB CMRR and 130 dB PSRR are mandatory |
Compared with OPA2189IDR and AD8629ARZ, the OPA277AIDRMR offers the best balance of ultra-low drift, high CMRR/PSRR, and bipolar-input linearity - making it preferred for industrial bridge and RTD signal chains where parameter correlation matters more than absolute minimum drift.
Availability
OPA277AIDRMR is available at Aetrix Electronics and suitable for analog input modules, weigh scales, and temperature transmitters requiring stable component supply across extended product lifecycles and industrial temperature ranges.
Supply support for OPA277AIDRMR 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 amp design and manufacturing.
The OPAx277 product line was engineered specifically for high-stability DC signal conditioning in industrial process control, test equipment, and sensor interface applications - replacing legacy OP-07/OP-177 with improved noise, speed, and quiescent power.
FAQ
What is the maximum supply voltage for OPA277AIDRMR?
The OPA277AIDRMR 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 specs - including offset, CMRR, and PSRR - are fully guaranteed per datasheet Section 6.3.
Does OPA277AIDRMR have offset trim pins?
No - OPA277AIDRMR is the dual version (OPA2277) in DRM package and does not include offset trim pins. Only the single-channel OPA277 (e.g., OPA277UA, OPA277PA) provides trim pins (1 and 8). The OPA277AIDRMR uses laser trimming for initial offset calibration and achieves ±10 µV typical without external adjustment.
What is the thermal pad connection requirement for OPA277AIDRMR?
The exposed thermal pad on the bottom of the OPA277AIDRMR's DRM (VSON-8) package must be soldered to a PCB copper pour connected to the V– (negative supply) net. This connection reduces junction-to-board thermal resistance to 16.7°C/W (Section 6.4), preventing thermal runaway during continuous 800 µA per amplifier operation at elevated ambient temperatures.
Can OPA277AIDRMR drive capacitive loads?
Yes - OPA277AIDRMR is stable driving up to 1500 pF capacitive load at unity gain, as verified in Figure 6-19 and 6-22 of the datasheet. For loads >1500 pF, add a small series resistor (e.g., 10–50 Ω) between output and capacitor to maintain phase margin and prevent peaking or oscillation.
How does OPA277AIDRMR compare to OP-07 in terms of performance?
OPA277AIDRMR replaces OP-07 with superior specs: 10 µV max offset (vs OP-07's 25 µV), ±0.1 µV/°C drift (vs ±0.6 µV/°C), 134 dB open-loop gain (vs 126 dB), and 800 µA quiescent current (vs 1.2 mA). It also adds ±30-V input protection and eliminates phase inversion - making it a drop-in upgrade for most OP-07 designs using SOIC-8 footprints.
OPA277AIDRMR 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)
OPA277AIDRMR FAQ
1.How can I place an order for OPA277AIDRMR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA277AIDRMR 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 OPA277AIDRMR reliable?
The price and inventory of OPA277AIDRMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA277AIDRMR is usually 5 days.
3.What payment methods are accepted for OPA277AIDRMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA277AIDRMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA277AIDRMR?
OPA277AIDRMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA277AIDRMR 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 OPA277AIDRMR?
For technical support, including OPA277AIDRMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA277AIDRMR requirements.
6.How does Aetrix verify that OPA277AIDRMR is sourced from the original manufacturer or authorized distributors?
All OPA277AIDRMR 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 OPA277AIDRMR meets industry standards.
7.What is the process for return or replacement of OPA277AIDRMR?
All OPA277AIDRMR units undergo pre-shipment inspection (PSI). If there is an issue with OPA277AIDRMR, 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 OPA277AIDRMR part is unused and in its original packaging.
Return procedure for OPA277AIDRMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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