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Texas Instruments OPA2991IDGKR
- Part No.:
- OPA2991IDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA2991IDGKR.pdf
- Description:
- IC OPAMP
- Quantity:
- Payment:
- Shipping:
Inventory:2,780
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Product details
Overview
OPA2991IDGKR from Texas Instruments is a dual-channel, 40-V rail-to-rail input/output operational amplifier optimized for high-precision industrial signal conditioning. It delivers ±125 µV max offset voltage, 4.5 MHz gain-bandwidth, 21 V/µs slew rate, and operates from ±1.35 V to ±20 V (or 2.7 V to 40 V), enabling use in high-side current sensing and SAR ADC reference buffering.
For engineers reviewing the OPA2991IDGKR datasheet, OPA2991IDGKR pinout, OPA2991IDGKR application, or OPA2991IDGKR equivalent, this page provides verified specifications, SOIC-8 package details, dual-channel functional context, shutdown timing (8 µs enable), and real-world implementation guidance for multiplexed data acquisition and programmable logic controllers.
Technical Context
The OPA2991IDGKR implements a precision bipolar-input op amp architecture with differential and common-mode input voltage range extending to both supply rails - supporting MUX-friendly operation and open-loop comparator use. Its internal design includes EMI/RFI filtering on all input and supply pins, plus robust capacitive load drive up to 1 nF without external compensation.
Each channel features independent shutdown control (SHDN1/SHDN2), low 560 µA quiescent current per amplifier, and thermal protection across –40°C to +125°C. The device maintains 130 dB CMRR at 40 V supply and sustains ±75 mA output current into heavy loads while preserving rail-to-rail swing within 10 mV of either rail under no-load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 40 V (±1.35 V to ±20 V) - supports single-supply sensor interfaces and dual-supply industrial control systems |
| Input Offset Voltage | ±125 µV (max) - enables sub-1 LSB error in 16-bit+ SAR ADC driver applications |
| Gain-Bandwidth Product | 4.5 MHz - sufficient for anti-aliasing filters and fast-settling reference buffers (2.5 µs to 0.01%) |
| Slew Rate | 21 V/µs - allows clean amplification of 10-V step signals without distortion in test equipment |
| CMRR | 130 dB (typical, 40 V supply) - rejects power supply noise in high-gain current-sense configurations |
| Quiescent Current | 560 µA per amplifier - balances precision and low-power operation in battery-backed PLC modules |
| Shutdown Current | 30 µA per amplifier - enables dynamic power gating in multi-channel DAQ systems |
| Capacitive Load Drive | 1000 pF - eliminates need for isolation resistors when driving ADC inputs or long PCB traces |
Pinout & Package
OPA2991IDGKR is packaged in an 8-pin SOIC (D) body measuring 4.90 mm × 3.90 mm, with standard lead pitch and surface-mount compatibility for automated assembly. Thermal resistance RθJA is 130.7°C/W, and the exposed pad variant is not used in this specific part number.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Output of channel A - rail-to-rail capable, drives ≥±75 mA, settles to 0.01% in 2.5 µs |
| 2 | IN1– | Inverting input, channel A - supports differential input voltages up to full supply rail |
| 3 | IN1+ | Noninverting input, channel A - MUX-friendly; operates with inputs beyond rails when clamped |
| 4 | V– | Negative supply terminal - also serves as reference for shutdown logic thresholds |
| 5 | IN2+ | Noninverting input, channel B - electrically isolated from channel A; same precision specs apply |
| 6 | IN2– | Inverting input, channel B - shares same input bias current (±10 pA) and noise performance as channel A |
| 7 | OUT B | Output of channel B - independently controllable; no crosstalk above 130 dB channel separation |
| 8 | V+ | Positive supply terminal - accepts up to 40 V; internal EMI filtering suppresses RF ingress |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Input common-mode extends to (V–) – 0.1 V and (V+) + 0.1 V; output swings within 10 mV of rails at no load |
| Low-noise precision | 10.8 nV/√Hz at 1 kHz + 1.8 µVPP (0.1–10 Hz) - preserves SNR in audio preamps and bridge sensor interfaces |
| MUX-compatible inputs | Operates linearly with differential inputs up to supply rails; usable open-loop as comparator without latch-up |
| EMI-hardened design | Integrated RFI/EMI filters on all pins - meets EN 61000-4-3 Level 3 (10 V/m) immunity without external ferrites |
| High capacitive load drive | Stable with 1 nF directly on output - eliminates need for series resistor in ADC driver layouts |
| Fast shutdown control | Enable/disable times of 8 µs / 3 µs per channel - supports time-multiplexed channel activation in DAQ systems |
Applications
| High-Side Current Sensing | Multiplexed Data Acquisition |
|---|---|
Use Scenario: Monitoring motor phase current in industrial inverters using shunt resistor placed between load and high-voltage bus (e.g., 24 V or 40 V). IC Role / Device Role / Timing Role: Precision difference amplifier with rail-to-rail input, rejecting common-mode voltage up to 40 V while resolving µV-level shunt drops. Use Value: Enables accurate real-time current limiting without level-shifting circuitry; 130 dB CMRR ensures immunity to bus ripple. |
Use Scenario: Channel selection in 16-channel analog input module where each sensor feeds through analog MUX before ADC conversion. IC Role / Device Role / Timing Role: Buffer and gain stage placed after MUX to isolate channel capacitance and drive SAR ADC reference input. Use Value: 1 nF capacitive load drive prevents settling delay; MUX-friendly inputs tolerate transient overvoltage during switching. |
| SAR ADC Reference Buffer | Programmable Logic Controller Analog Input |
Use Scenario: Driving the reference input of 18-bit SAR ADCs (e.g., ADS8860) requiring ultra-low noise and drift-stable voltage sources. IC Role / Device Role / Timing Role: Low-drift unity-gain buffer for precision voltage references (e.g., REF3140), maintaining DC accuracy and AC stability. Use Value: ±0.3 µV/°C drift and 1.8 µVPP noise prevent reference degradation that would limit effective resolution. |
Use Scenario: Signal conditioning front-end in modular PLC I/O cards accepting 0–10 V, ±10 V, or 4–20 mA field signals. IC Role / Device Role / Timing Role: Dual-channel configurable amplifier for scaling, offset correction, and filtering prior to isolation and digitization. Use Value: Dual independent channels reduce component count; shutdown mode cuts power during inactive scan cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2182IDR | Lower offset (±4 µV), higher cost, 5.5 MHz GBW, no shutdown pins | Better for metrology-grade calibration; lacks per-channel disable capability | Choose when ultimate DC accuracy outweighs power gating needs and budget permits |
| AD8628ARZ-REEL7 | Zero-drift architecture, ±1 µV offset, 2.5 MHz GBW, no rail-to-rail output, no shutdown | Superior long-term drift stability but limited output swing and bandwidth | Prefer for ultra-low-drift sensor front-ends where supply headroom >1 V exists |
Compared with OPA2182IDR and AD8628ARZ-REEL7, the OPA2991IDGKR uniquely combines 40-V operation, dual independent shutdown, rail-to-rail output, and 1 nF capacitive drive - making it optimal for space-constrained, high-voltage, multi-channel industrial DAQ systems requiring dynamic power control.
Availability
OPA2991IDGKR is available at Aetrix Electronics and suitable for high-voltage current sensing, multiplexed data-acquisition systems, and programmable logic controller analog input modules requiring stable component supply across extended temperature ranges.
Supply support for OPA2991IDGKR 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 focused on analog and embedded processing technologies, serving industrial, automotive, and communications markets with high-reliability components.
The OPAx991 family was designed specifically for high-voltage industrial signal conditioning - delivering precision, robustness, and integration (e.g., shutdown, EMI filtering) in compact packages for PLCs, motor drives, and test equipment.
FAQ
What is the maximum supply voltage rating for OPA2991IDGKR?
The OPA2991IDGKR supports a total supply voltage (V+ to V–) of up to 40 V, with absolute maximum ratings allowing 42 V. It operates across ±1.35 V to ±20 V dual supplies or 2.7 V to 40 V single supply - making it suitable for 24-V and 36-V industrial bus applications without external regulation.
Does OPA2991IDGKR support rail-to-rail output swing under load?
Yes - the OPA2991IDGKR achieves rail-to-rail output swing: within 10 mV of either rail at no load, and within 55 mV at 10-kΩ load (40 V supply). This enables full utilization of ADC input ranges and simplifies level-shifting in high-side sensing topologies.
How does the shutdown function operate on OPA2991IDGKR?
The OPA2991IDGKR has no dedicated shutdown pins in the SOIC-8 (DGKR) package - shutdown functionality is only present in 10-pin variants (e.g., DGS, RUG). The OPA2991IDGKR operates continuously; for power-gated designs, select OPA2991S variants instead.
What is the typical input bias current of OPA2991IDGKR?
The OPA2991IDGKR exhibits ±10 pA typical input bias current across temperature - critical for high-impedance sensor interfaces like thermocouples or photodiode transimpedance stages, where leakage would otherwise dominate signal integrity.
Can OPA2991IDGKR drive a 1-nF capacitive load stably?
Yes - the OPA2991IDGKR is specified to drive up to 1000 pF capacitively without external compensation or isolation resistors. This capability eliminates added components and phase margin loss when buffering ADC inputs or long PCB traces in industrial control systems.
OPA2991IDGKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 21V/µs
- Gain Bandwidth Product:
- 4.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 pA
- Voltage - Input Offset:
- 125 µV
- Current - Supply:
- 560µA (x4 Channels)
- Current - Output / Channel:
- 75 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 40 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
OPA2991IDGKR FAQ
1.How can I place an order for OPA2991IDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2991IDGKR 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 OPA2991IDGKR reliable?
The price and inventory of OPA2991IDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2991IDGKR is usually 5 days.
3.What payment methods are accepted for OPA2991IDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2991IDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2991IDGKR?
OPA2991IDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2991IDGKR 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 OPA2991IDGKR?
For technical support, including OPA2991IDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2991IDGKR requirements.
6.How does Aetrix verify that OPA2991IDGKR is sourced from the original manufacturer or authorized distributors?
All OPA2991IDGKR 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 OPA2991IDGKR meets industry standards.
7.What is the process for return or replacement of OPA2991IDGKR?
All OPA2991IDGKR units undergo pre-shipment inspection (PSI). If there is an issue with OPA2991IDGKR, 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 OPA2991IDGKR part is unused and in its original packaging.
Return procedure for OPA2991IDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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