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Texas Instruments OPA4991IDR
- Part No.:
- OPA4991IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4991IDR.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,575
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Product details
Overview
OPA4991IDR from Texas Instruments is a quad-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 10.8 nV/√Hz noise at 1 kHz - enabling accurate low-level sensor amplification and high-voltage ADC driving in programmable logic controllers and multiplexed data-acquisition systems.
For engineers reviewing the OPA4991IDR datasheet, OPA4991IDR pinout, OPA4991IDR application, or OPA4991IDR equivalent, this page provides verified specifications, SOIC-14 package details, quad-channel pin mapping, real-world use cases in high-side current sensing and SAR ADC reference buffering, and two validated alternative op amps with documented functional trade-offs.
Technical Context
The OPA4991IDR integrates four independent high-voltage amplifiers sharing common supply rails (±1.35 V to ±20 V or 2.7 V to 40 V), each featuring MUX-friendly inputs capable of differential operation up to the supply rails and open-loop comparator functionality. Its architecture supports robust EMI/RFI rejection via integrated filters on input and supply pins.
Each channel offers ±75 mA output drive, rail-to-rail output swing within 10 mV of rails (no load, 40 V), and stable operation into 1 nF capacitive loads - making it suitable for driving anti-aliasing filters, reference buffers, and high-impedance sensor interfaces without external compensation.
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/24 V and dual-supply ±15 V industrial rails |
| Input Offset Voltage | ±125 µV (max) - enables sub-1 LSB error in 16-bit SAR ADC systems with 5 V reference |
| Gain-Bandwidth Product | 4.5 MHz - sufficient for closed-loop gain ≥10 with >400 kHz small-signal bandwidth |
| Slew Rate | 21 V/µs - allows full-scale 10 V step response in ≤0.5 µs, critical for fast-settling data acquisition |
| Input Voltage Noise | 10.8 nV/√Hz @ 1 kHz - ensures <1 µV RMS noise in 100 kHz bandwidth, preserving SNR in precision sensors |
| Quiescent Current | 560 µA per amplifier - enables quad-channel operation at <2.3 mA total, ideal for power-constrained PLC modules |
| Common-Mode Rejection | 130 dB - rejects >3 mV of common-mode interference on 10 V signals, essential for noisy factory environments |
Pinout & Package
OPA4991IDR is packaged in a 14-pin SOIC (D) body measuring 8.65 mm × 3.90 mm, rated for –40°C to +125°C operation and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8, 14 | OUT1, OUT2, OUT3, OUT4 | Amplifier outputs - each drives ≥±75 mA, rail-to-rail swing, stable into 1 nF |
| 2, 5, 9, 12 | IN1–, IN2–, IN3–, IN4– | Inverting inputs - support differential input voltages up to supply rails, ±10 pA bias current |
| 3, 4, 10, 11 | IN1+, IN2+, IN3+, IN4+ | Noninverting inputs - same rail-to-rail common-mode range as inverting inputs, MUX-compatible |
| 4, 11 | V+, V– | Positive and negative supply terminals - shared across all four amplifiers; decoupling required per channel |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full dynamic range utilization with 2.7 V to 40 V supplies - no headroom loss in low-voltage sensor front-ends or high-voltage actuator interfaces |
| Low offset drift | ±0.3 µV/°C - limits offset shift to <38 µV over –40°C to +125°C, critical for uncalibrated temperature-stable measurement |
| MUX-friendly/comparator inputs | Differential inputs operate up to supply rails and tolerate open-loop use - eliminates need for external clamping in multiplexed sensor arrays |
| High capacitive load drive | Stable into 1 nF - directly drives RC anti-aliasing filters and long PCB traces without isolation resistors |
| Robust EMIRR performance | Integrated EMI/RFI filters on input and supply pins - maintains DC accuracy in presence of 900 MHz GSM bursts and switching power supply noise |
Applications
| High-Side Current Sensing | SAR ADC Reference Buffer |
|---|---|
Use Scenario: Monitoring motor phase current in industrial inverters using shunt resistor placed between power rail and load. IC Role / Device Role / Timing Role: Amplifies mV-level shunt voltage with high CMRR and rail-to-rail output to feed isolated ADC input. Use Value: ±125 µV offset ensures <0.5% full-scale error at 100 mV sense voltage; 130 dB CMRR rejects 24 V common-mode bus noise. |
Use Scenario: Buffering precision voltage reference (e.g., REF3140) for 16-bit SAR ADCs in test equipment. IC Role / Device Role / Timing Role: Low-noise, low-drift buffer isolating reference from ADC input capacitance and digital switching transients. Use Value: 10.8 nV/√Hz noise contributes <0.25 LSB RMS noise; 0.3 µV/°C drift maintains reference stability across thermal cycles. |
| Multiplexed Data-Acquisition Systems | Programmable Logic Controllers (PLCs) |
Use Scenario: Signal conditioning for 16-channel analog input module with analog multiplexer (e.g., MUX509) and anti-aliasing filters. IC Role / Device Role / Timing Role: Quad-channel amplifier providing gain, level-shifting, and filtering before ADC sampling. Use Value: Four independent channels reduce board space vs discrete solutions; 4.5 MHz GBW supports 100 kSPS sampling with 10× oversampling. |
Use Scenario: Analog I/O conditioning in DIN-rail mounted PLCs interfacing with 4–20 mA transmitters and thermocouples. IC Role / Device Role / Timing Role: Precision amplifier for current loop receiver, cold-junction compensation, and sensor linearization. Use Value: ±20 V supply range accommodates 24 V system rails; –40°C to +125°C rating ensures reliability in cabinet-mounted enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage, low-offset operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4197IPWR | Lower offset (±25 µV typ), lower noise (5.2 nV/√Hz), but only 2.2 MHz GBW and no shutdown pins | Better DC precision for ultra-low-drift applications; insufficient bandwidth for fast-settling 100 kSPS DAQ | Select when offset and noise dominate over speed; avoid when >3 MHz closed-loop bandwidth required |
| LM324BDR | Wider temp range (–40°C to +125°C), lower cost, but higher offset (±1.5 mV), lower CMRR (90 dB), no rail-to-rail output | Acceptable for non-critical 12-bit systems where cost and legacy compatibility outweigh precision needs | Select for cost-sensitive, non-precision industrial controls; not suitable for 16-bit+ measurement or high-CMRR environments |
Compared with OPA4991IDR, OPA4197IPWR trades bandwidth for superior DC accuracy and noise, while LM324BDR sacrifices precision and rail-to-rail capability for cost and legacy footprint compatibility - making OPA4991IDR the balanced choice for 16-bit industrial DAQ requiring speed, precision, and robustness.
Availability
OPA4991IDR is available at Aetrix Electronics and suitable for programmable logic controllers, multiplexed data-acquisition systems, and high-side current sensing applications requiring stable component supply, extended temperature operation, and long-term industrial lifecycle support.
Supply support for OPA4991IDR 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 high-reliability industrial and automotive-grade components.
The OPAx991 family was designed specifically for high-voltage, high-precision industrial signal chains - targeting applications demanding rail-to-rail operation, low drift, and robust noise immunity in harsh electromagnetic environments.
FAQ
What is the maximum supply voltage for the OPA4991IDR?
The OPA4991IDR supports a maximum supply voltage of 40 V (single-supply) or ±20 V (dual-supply), with absolute maximum ratings up to 42 V. Operation beyond 40 V risks permanent damage. The device is fully specified from 2.7 V to 40 V, enabling direct interface with 24 V industrial rails and legacy ±15 V systems without level-shifting. This wide range makes OPA4991IDR suitable for both low-power sensor nodes and high-voltage actuator control circuits.
Does the OPA4991IDR include shutdown functionality?
No, the OPA4991IDR (SOIC-14 package, part number suffix 'IDR') does not include shutdown pins. Shutdown capability is only present in the OPA4991S variants (e.g., OPA4991SIDR), which feature dedicated SHDN1–SHDN4 pins. The standard OPA4991IDR operates continuously when powered and lacks logic-controlled disable functionality. For power-gated designs, external FET switching of the supply or selection of the 'S' variant is required. Always verify the exact suffix against TI's official orderable addendum.
What is the input common-mode voltage range of the OPA4991IDR?
The OPA4991IDR supports a true rail-to-rail input common-mode range: (V–) – 0.1 V to (V+) + 0.1 V. This allows the inputs to accept signals extending slightly beyond both supply rails - critical for interfacing with multiplexed sensor outputs or comparator-like configurations. The specification holds across the full operating temperature range (–40°C to +125°C) and supply range (2.7 V to 40 V). This capability eliminates the need for external level-shifting in many industrial signal-conditioning topologies involving the OPA4991IDR.
Can the OPA4991IDR drive a 1 nF capacitive load stably?
Yes, the OPA4991IDR is explicitly characterized and guaranteed to drive up to 1 nF capacitive loads without oscillation or excessive ringing. This is achieved through internal compensation and high output current capability (±75 mA). Stable operation into 1 nF enables direct connection to anti-aliasing filters, long PCB traces, and ADC input capacitors without requiring series isolation resistors - simplifying layout and preserving signal integrity in high-resolution data-acquisition systems using the OPA4991IDR.
What is the typical quiescent current per amplifier in the OPA4991IDR?
The typical quiescent current per amplifier in the OPA4991IDR is 560 µA at 25°C, with a maximum of 685 µA across temperature and process variation. For the full quad-channel device, this translates to ~2.24 mA typical total supply current. This low power consumption enables integration into thermally constrained PLC modules and battery-backed industrial sensors while maintaining high AC performance - a key differentiator versus older quad op amps like the LM324BDR, which draws ~1.5 mA per channel.
OPA4991IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- 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:
- 14-SOIC
OPA4991IDR FAQ
1.How can I place an order for OPA4991IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4991IDR 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 OPA4991IDR reliable?
The price and inventory of OPA4991IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4991IDR is usually 5 days.
3.What payment methods are accepted for OPA4991IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4991IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4991IDR?
OPA4991IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4991IDR 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 OPA4991IDR?
For technical support, including OPA4991IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4991IDR requirements.
6.How does Aetrix verify that OPA4991IDR is sourced from the original manufacturer or authorized distributors?
All OPA4991IDR 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 OPA4991IDR meets industry standards.
7.What is the process for return or replacement of OPA4991IDR?
All OPA4991IDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA4991IDR, 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 OPA4991IDR part is unused and in its original packaging.
Return procedure for OPA4991IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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