My Inquiry
My Account
Texas Instruments OPA2991IDSGR
- Part No.:
- OPA2991IDSGR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
OPA2991IDSGR.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,940
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
OPA2991IDSGR from Texas Instruments is a dual-channel, 40-V rail-to-rail input/output operational amplifier with ±125 µV max offset voltage, ±0.3 µV/°C drift, and 10.8 nV/√Hz noise at 1 kHz-designed for precision signal conditioning in high-voltage industrial sensor interfaces and ADC driver stages.
For engineers reviewing the OPA2991IDSGR datasheet, OPA2991IDSGR pinout, OPA2991IDSGR application, or OPA2991IDSGR equivalent, this page delivers verified specifications, SOIC-8 package details, dual-channel shutdown control, rail-to-rail CMVR to supply rails, and real-world use cases in multiplexed data acquisition and current sensing.
Technical Context
The OPA2991IDSGR implements a dual-channel, fully differential input architecture supporting common-mode voltages from (V–) – 0.1 V to (V+) + 0.1 V and differential inputs up to supply rails-enabling direct connection to MUX outputs without level-shifting. Its 4.5-MHz gain-bandwidth product and 21 V/µs slew rate support fast settling in SAR ADC reference buffers and programmable gain stages.
Each channel integrates independent shutdown control (SHDN1/SHDN2), delivering 30 µA quiescent current per amplifier in shutdown mode while maintaining high output impedance (320 MΩ || 2 pF) and robust EMI/RFI filtering on all pins-critical for noisy PLC and motor-control environments operating from –40°C to 125°C.
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 3.3 V/5 V systems and high-voltage industrial rails up to ±20 V. |
| Input Offset Voltage | ±125 µV (max): enables sub-0.1% error in 12-bit+ precision current sensing and bridge amplifier applications. |
| Offset Drift | ±0.3 µV/°C: ensures stable DC accuracy over full –40°C to 125°C temperature range without recalibration. |
| Input Voltage Noise | 10.8 nV/√Hz at 1 kHz: preserves SNR in low-level audio preamplifiers and thermocouple signal chains. |
| Gain-Bandwidth Product | 4.5 MHz: allows stable unity-gain operation with 20 pF load and supports 10-bit+ ADC sampling at ≥1 MSPS. |
| Slew Rate | 21 V/µs: delivers <2.5 µs 0.01% settling for 10 V step-suitable for fast-settling reference buffers in SAR ADCs. |
| Capacitive Load Drive | 1 nF: drives long traces or ADC input capacitance directly without external isolation resistor. |
| Common-Mode Rejection | 130 dB (typ): rejects power-supply ripple and ground bounce in high-side current sensing configurations. |
Pinout & Package
OPA2991IDSGR is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.90 mm with standard gull-wing leads and surface-mount compatibility. Thermal performance is characterized with RθJA = 130.7°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Output of channel A; rail-to-rail swing supports full-scale ADC input drive without clipping. |
| 2 | IN1– | Inverting input, channel A; accepts differential signals up to supply rails-MUX-friendly for multiplexed sensor arrays. |
| 3 | IN1+ | Noninverting input, channel A; high Z (6 TΩ || 1 pF) minimizes loading on high-impedance sources like piezoelectric sensors. |
| 4 | V– | Negative supply terminal; thermal pad (if present in DSG variant) must be connected to V– for optimal thermal performance. |
| 5 | IN2+ | Noninverting input, channel B; independently configurable for dual-sensor conditioning or differential pair amplification. |
| 6 | IN2– | Inverting input, channel B; supports open-loop comparator operation when used with hysteresis network. |
| 7 | OUT B | Output of channel B; capable of ±75 mA short-circuit current-drives heavy loads or multiple downstream stages. |
| 8 | V+ | Positive supply terminal; EMI/RFI filters suppress noise coupling in industrial 24 V systems. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full dynamic range utilization across 2.7–40 V supplies-no external level shifters needed for 0–VREF ADC interfacing. |
| Dual independent shutdown | SHDN1/SHDN2 pins reduce total system quiescent current by >90% when one channel is idle-critical for battery-powered DAQ modules. |
| MUX-friendly inputs | Inputs tolerate differential voltages up to supply rails and operate linearly with common-mode inputs beyond rails-eliminates clamping diodes in multiplexed front-ends. |
| High capacitive load drive (1 nF) | Stable operation into ADC input capacitance or long PCB traces without external compensation-reduces BOM count and layout complexity. |
| Robust EMIRR performance | Integrated EMI/RFI filters on V+ and input pins suppress 800 MHz–2.5 GHz RF interference-meets IEC 61000-4-3 Class B immunity requirements. |
| Wide temperature range | Specified from –40°C to 125°C with guaranteed offset drift ≤±0.3 µV/°C-supports under-hood automotive and factory-floor industrial deployment. |
Applications
| High-Side Current Sensing | Multiplexed Data Acquisition |
|---|---|
|
Use Scenario: Monitoring motor phase currents in 24 V industrial drives using shunt resistors placed between load and supply rail. IC Role / Device Role / Timing Role: Dual-channel OPA2991IDSGR configures one amplifier as high-side current sense amplifier (INA) and second as reference buffer for ADC. Use Value: Rail-to-rail input allows direct sensing at VSUPPLY; ±125 µV offset ensures <0.5% gain error at 100 mV shunt drop; 130 dB CMRR rejects bus noise. |
Use Scenario: Signal conditioning for 8-channel thermistor array in environmental monitoring system with analog multiplexer (e.g., MUX509). IC Role / Device Role / Timing Role: OPA2991IDSGR channels condition two parallel sensor paths per cycle-reducing acquisition time vs. single-channel solution. Use Value: MUX-friendly inputs accept full-rail differential swings; 4.5 MHz GBW settles within 2.5 µs for 1 MSPS sampling; shutdown saves 530 µA per idle channel. |
| SAR ADC Reference Buffer | Low-Power Audio Preamplifier |
|
Use Scenario: Driving REF input of 16-bit SAR ADC (e.g., ADS8860) with stable, low-noise voltage reference (e.g., REF3140). IC Role / Device Role / Timing Role: OPA2991IDSGR provides low-output-impedance, low-noise buffer with fast settling to meet ADC aperture uncertainty requirements. Use Value: 10.8 nV/√Hz noise contributes <0.5 LSB error; 21 V/µs slew rate achieves 0.01% settling in 2.5 µs; rail-to-rail output avoids headroom loss. |
Use Scenario: First-stage amplification for MEMS microphone or electret condenser mic in portable instrumentation with 3.3 V supply. IC Role / Device Role / Timing Role: OPA2991IDSGR operates single-supply at 3.3 V with rail-to-rail I/O, enabling full 0–3.3 V signal swing into anti-aliasing filter. Use Value: 560 µA per amplifier enables multi-channel audio front-end with <2 mA total IQ; 1.8 µVPP 0.1–10 Hz noise preserves speech intelligibility. |
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), lower noise (5.7 nV/√Hz), but narrower supply (±18 V max) and no shutdown pins. | Better DC precision for metrology; unsuitable where 40 V rail or independent channel shutdown is required. | Select OPA2182IDR only if ultra-low offset dominates over supply range and power management needs. |
| AD8638ARZ-REEL7 | Similar offset (±150 µV) and supply (±18 V), but no rail-to-rail output and no shutdown-higher 12 nV/√Hz noise. | Limited to mid-voltage (<36 V) applications; cannot drive ADCs to full scale without headroom loss. | Choose AD8638ARZ-REEL7 only if legacy footprint compatibility outweighs need for rail-to-rail output and shutdown control. |
Compared with OPA2182IDR and AD8638ARZ-REEL7, the OPA2991IDSGR uniquely combines 40-V operation, dual independent shutdown, rail-to-rail I/O, and 130 dB CMRR-making it the only option among the three qualified for high-voltage, low-power, multiplexed industrial DAQ systems.
Availability
OPA2991IDSGR is available at Aetrix Electronics and suitable for high-voltage sensor interfaces, multiplexed data acquisition systems, and precision ADC driver applications requiring stable component supply across extended temperature and voltage ranges.
Supply support for OPA2991IDSGR 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 expertise in precision op amps and industrial-grade signal chain solutions.
The OPAx991 family-including OPA2991IDSGR-is designed specifically for high-voltage, low-drift, low-noise industrial signal conditioning, targeting applications such as PLC analog I/O modules, motor current sensing, and high-accuracy data acquisition.
FAQ
What is the maximum supply voltage rating for OPA2991IDSGR?
The OPA2991IDSGR has an absolute maximum supply voltage of 42 V (V+ to V–), with recommended operation from 2.7 V to 40 V. This 40-V rating enables use in 24-V industrial systems and ±15-V test equipment without derating. Exceeding 42 V risks permanent damage per the Absolute Maximum Ratings table in the datasheet.
Does OPA2991IDSGR support true rail-to-rail input and output operation?
Yes, OPA2991IDSGR supports rail-to-rail input common-mode voltage from (V–) – 0.1 V to (V+) + 0.1 V and rail-to-rail output swing within 5–55 mV of each rail (depending on load). This allows full utilization of ADC reference voltage and eliminates level-shifting circuitry in single-supply designs.
How does the shutdown feature work on OPA2991IDSGR?
OPA2991IDSGR features two independent shutdown pins (SHDN1 and SHDN2). Driving either pin to V– + 0.2 V or lower enables its respective amplifier; driving to V– + 1.1 V or higher disables it. Shutdown reduces quiescent current to 30 µA per channel and places the output in high-impedance state (320 MΩ || 2 pF).
Can OPA2991IDSGR drive a 1-nF capacitive load stably?
Yes, OPA2991IDSGR is specified to drive up to 1000 pF capacitive load without oscillation or peaking, as confirmed in the Electrical Characteristics table. This capability eliminates the need for isolation resistors when driving SAR ADC inputs or long PCB traces-simplifying layout and preserving bandwidth.
What is the typical input offset voltage drift of OPA2991IDSGR over temperature?
The OPA2991IDSGR has a typical input offset voltage drift of ±0.3 µV/°C across –40°C to 125°C, as specified in the Electrical Characteristics table. This ultra-low drift ensures minimal calibration drift in precision current sensing and bridge amplifier applications over wide ambient temperature swings.
OPA2991IDSGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- 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 (x2 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-WSON (2x2)
OPA2991IDSGR FAQ
1.How can I place an order for OPA2991IDSGR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2991IDSGR 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 OPA2991IDSGR reliable?
The price and inventory of OPA2991IDSGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2991IDSGR is usually 5 days.
3.What payment methods are accepted for OPA2991IDSGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2991IDSGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2991IDSGR?
OPA2991IDSGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2991IDSGR 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 OPA2991IDSGR?
For technical support, including OPA2991IDSGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2991IDSGR requirements.
6.How does Aetrix verify that OPA2991IDSGR is sourced from the original manufacturer or authorized distributors?
All OPA2991IDSGR 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 OPA2991IDSGR meets industry standards.
7.What is the process for return or replacement of OPA2991IDSGR?
All OPA2991IDSGR units undergo pre-shipment inspection (PSI). If there is an issue with OPA2991IDSGR, 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 OPA2991IDSGR part is unused and in its original packaging.
Return procedure for OPA2991IDSGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA2991IDSGR Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
