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Texas Instruments OPA277AIDRMTG4
- Part No.:
- OPA277AIDRMTG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
OPA277AIDRMTG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8VSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,144
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Product details
Overview
OPA277AIDRMTG4 from Texas Instruments is a single high-precision 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 and analog input modules where long-term accuracy is critical.
For engineers reviewing the OPA277AIDRMTG4 datasheet, OPA277AIDRMTG4 pinout, OPA277AIDRMTG4 application, or OPA277AIDRMTG4 equivalent, this page provides verified specifications, SOIC-8 package mapping, trim-capable pin functions, real-world thermal data, and two validated alternative options for precision op amp selection in temperature transmitters and battery test equipment.
Technical Context
The OPA277AIDRMTG4 uses a laser-trimmed bipolar input stage with internal bias current cancellation, eliminating need for external compensation resistors. Its dual offset trim pins (1 and 8) support manual nulling of residual offset without introducing additional drift - a feature absent in dual/quad variants.
It achieves unity-gain stability while maintaining 1 MHz GBW and 0.8 V/µs slew rate across ±2 V to ±18 V supply range, with performance specified over –40°C to +85°C using a single limit across ±5 V to ±15 V - unlike most op amps rated only at one voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input offset voltage | ±10 µV max (typical production distribution centered near 0 µV; enables <0.001% gain error in 10 V full-scale systems) |
| Offset drift | ±0.1 µV/°C max (ensures <1 µV total drift over 85°C ambient range; critical for uncalibrated field instrumentation) |
| Open-loop gain | 134 dB min (supports >10⁶ closed-loop gain stability; maintains accuracy in high-precision integrators) |
| CMRR / PSRR | 140 dB / 130 dB min (rejects >10⁷× common-mode or supply noise; essential in noisy PLC analog inputs) |
| Quiescent current | 800 µA per amplifier (halves power vs OP-177; allows dual-supply operation in battery-powered DAQ nodes) |
| Supply range | ±2 V to ±18 V (single-specification coverage from ±5 V to ±15 V; simplifies design reuse across 10 V–30 V systems) |
| 0.1–10 Hz noise | 0.22 µVPP (meets sub-1 µVPP requirement for 24-bit ADC front-ends in pressure transmitters) |
Pinout & Package
OPA277AIDRMTG4 is supplied in an 8-pin SOIC (D package), 3.91 mm × 4.90 mm body size, with exposed pad not present (non-thermal VSON variant is DRM; this is D). Pin 1 is marked with a dot or bevelled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim | Input for external potentiometer to null amplifier's inherent offset; leave floating if unused |
| 2 | –In | Inverting input; high-impedance node requiring matched thermal layout to avoid thermoelectric errors |
| 3 | +In | Noninverting input; internally compensated for bias current; no external resistor needed |
| 4 | V– | Negative supply rail; connects to system ground or negative rail; must be decoupled locally |
| 5 | NC | No internal connection; electrically isolated; may be left unconnected or tied to V– for mechanical stability |
| 6 | Output | Class-A output stage capable of ±35 mA short-circuit current; drives 2 kΩ load to within 1.5 V of rails |
| 7 | V+ | Positive supply rail; requires local 0.1 µF ceramic decoupling; supports up to ±18 V |
| 8 | Offset Trim | Second trim terminal completing external potentiometer circuit; referenced to V– in standard configuration |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed offset & drift | Eliminates factory calibration in most systems; ±10 µV / ±0.1 µV/°C spec holds over full temperature range |
| Internal bias current cancellation | Removes need for external Rcomp; avoids added offset/noise from resistor mismatch in high-Z sensor interfaces |
| Unity-gain stable, phase-inversion free | Enables direct use in follower, integrator, and transimpedance configurations without stability analysis or compensation |
| ±30 V differential input protection | Withstands transient overvoltage on sensor lines (e.g., RTD lead faults) without latch-up or parametric shift |
| EMI rejection ratio (EMIRR IN+) | Quantified RF immunity on noninverting input; prevents rectified offset shifts in industrial EMI environments |
Applications
| Weight Scale Signal Conditioning | Analog Input Module |
|---|---|
Use Scenario: Amplifying mV-level outputs from strain gauge bridges in platform scales with 10,000:1 resolution. IC Role / Device Role / Timing Role: Precision DC-coupled difference amplifier with programmable gain and offset trimming capability. Use Value: Ultra-low drift ensures <10 ppm/°C zero-point drift; 0.22 µVPP 0.1–10 Hz noise preserves 22-bit effective resolution. | Use Scenario: Front-end signal conditioning for 16-channel 24-bit isolated analog input cards in PLCs. IC Role / Device Role / Timing Role: Single-supply or dual-supply precision buffer and level-shifter driving SAR ADC reference buffers. Use Value: 140 dB CMRR rejects ground loop noise across distributed I/O; ±18 V supply headroom accommodates wide sensor ranges. |
| Temperature Transmitter | Battery Test System |
Use Scenario: Linearizing and amplifying RTD or thermocouple signals in 4–20 mA HART-enabled field transmitters. IC Role / Device Role / Timing Role: Low-power, high-stability instrumentation amplifier driver with cold-junction compensation interface. Use Value: 800 µA quiescent current enables loop-powered operation; ±0.1 µV/°C drift meets Class A transmitter accuracy standards. | Use Scenario: High-accuracy voltage/current sensing during charge/discharge cycling of Li-ion cells in production testers. IC Role / Device Role / Timing Role: Precision current-sense amplifier input stage and reference buffer for 100 ppm accuracy requirements. Use Value: 134 dB open-loop gain ensures <0.002% gain error over temperature; 1 MHz GBW supports fast settling in automated test sequences. |
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-channel version; identical offset (±10 µV), drift (±0.1 µV/°C), and noise specs; shares same SOIC-8 package footprint | Used where space-constrained dual-sensor conditioning is required (e.g., differential RTD + cold-junction); no change to PCB layout needed | Select OPA2277AIDR when dual amplification is needed without increasing board area or thermal coupling between channels |
| OPA2189IDR | Zero-drift auto-zero architecture; 0.005 µV/°C max drift; higher 1.3 MHz GBW; 1.3 µA IQ; no trim pins | Better for ultra-stable DC gain blocks in lab instruments; unsuitable where external offset trimming is mandatory per safety certification | Choose OPA2189IDR for sub-ppm/°C drift-critical applications; avoid if legacy trim circuitry or OP-177 form-factor compatibility is required |
Compared with OPA2277AIDR, the OPA277AIDRMTG4 saves board space in single-amplifier roles and retains manual trim capability; versus OPA2189IDR, it trades zero-drift performance for proven bipolar stability, lower EMI susceptibility, and direct OP-177 replacement qualification.
Availability
OPA277AIDRMTG4 is available at Aetrix Electronics and suitable for weigh scale electronics, analog input modules, and temperature transmitter designs requiring stable component supply with guaranteed long-term manufacturability and TI's 10-year product longevity commitment.
Supply support for OPA277AIDRMTG4 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The OPAx277 series was designed specifically to replace the OP-177 in high-accuracy, low-drift industrial measurement systems - emphasizing DC precision, thermal stability, and ease of use in harsh environments without external compensation.
FAQ
What is the maximum supply voltage rating for OPA277AIDRMTG4?
The OPA277AIDRMTG4 supports dual supplies from ±2 V to ±18 V, with absolute maximum supply voltage (VS) rated at 36 V. Operation beyond ±18 V is not recommended, as key parameters like output swing and PSRR are only characterized up to ±18 V. The device remains functional but may exhibit degraded performance outside its recommended operating conditions.
Does OPA277AIDRMTG4 require external bias current compensation resistors?
No, OPA277AIDRMTG4 does not require external bias current compensation resistors. Its input stage incorporates internal bias current cancellation, resulting in ≤1 nA max input bias current. Adding an external Rcomp would degrade offset voltage and increase noise - contrary to typical op amp practice. This simplifies PCB layout for high-impedance sensor interfaces like pH electrodes or piezoresistive sensors.
Can OPA277AIDRMTG4 drive capacitive loads without oscillation?
Yes, OPA277AIDRMTG4 is unity-gain stable and can safely drive ≥1500 pF capacitive loads without external isolation resistors, as confirmed by Figure 6-19 in the datasheet. For loads >1500 pF or in high-precision integrator applications, adding a small series resistor (e.g., 10–50 Ω) between output and capacitor improves phase margin without affecting DC accuracy.
Is the OPA277AIDRMTG4 pin-compatible with OP-177?
Yes, OPA277AIDRMTG4 is a direct pin-compatible and functionally enhanced replacement for OP-177 in SOIC-8 packages. Both share identical pinout (including offset trim pins 1 and 8), supply range, and output drive capability. OPA277AIDRMTG4 improves upon OP-177 with half the quiescent current, twice the bandwidth, lower noise, and tighter drift specification - requiring no PCB changes.
What is the purpose of the NC pin (Pin 5) on OPA277AIDRMTG4?
Pin 5 on OPA277AIDRMTG4 is a no-connect (NC) terminal with no internal connection. It may be left floating, tied to V– for mechanical reinforcement, or used as a keep-out zone for routing. TI confirms this pin has no electrical function and does not affect device operation whether connected or unconnected - making it safe for automated assembly and reflow processes.
OPA277AIDRMTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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)
OPA277AIDRMTG4 FAQ
1.How can I place an order for OPA277AIDRMTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA277AIDRMTG4 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 OPA277AIDRMTG4 reliable?
The price and inventory of OPA277AIDRMTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA277AIDRMTG4 is usually 5 days.
3.What payment methods are accepted for OPA277AIDRMTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA277AIDRMTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA277AIDRMTG4?
OPA277AIDRMTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA277AIDRMTG4 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 OPA277AIDRMTG4?
For technical support, including OPA277AIDRMTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA277AIDRMTG4 requirements.
6.How does Aetrix verify that OPA277AIDRMTG4 is sourced from the original manufacturer or authorized distributors?
All OPA277AIDRMTG4 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 OPA277AIDRMTG4 meets industry standards.
7.What is the process for return or replacement of OPA277AIDRMTG4?
All OPA277AIDRMTG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA277AIDRMTG4, 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 OPA277AIDRMTG4 part is unused and in its original packaging.
Return procedure for OPA277AIDRMTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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