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Texas Instruments OPA2991IPWR
- Part No.:
- OPA2991IPWR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
OPA2991IPWR.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,432
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Product details
Overview
OPA2991IPWR from Texas Instruments is a dual-channel, 40-V rail-to-rail input/output operational amplifier optimized for high-voltage industrial signal conditioning. It delivers ±125 µV max offset voltage, 4.5 MHz gain-bandwidth, 21 V/µs slew rate, and 130 dB CMRR - enabling precision current sensing and ADC driver applications in programmable logic controllers and multiplexed data-acquisition systems.
For engineers reviewing the OPA2991IPWR datasheet, OPA2991IPWR pinout, OPA2991IPWR application, or OPA2991IPWR equivalent, this page provides verified specifications, SOIC-8 package details, dual-channel shutdown functionality, EMI-hardened inputs, and validated alternatives for high-voltage analog front-end design.
Technical Context
The OPA2991IPWR implements a dual-channel, fully differential input architecture with independent rail-to-rail common-mode range extending to both supply rails (V– – 0.1 V to V+ + 0.1 V) and MUX-friendly comparator-capable inputs. Its internal topology supports open-loop operation and maintains stability driving up to 1 nF capacitive loads without external compensation.
Each channel features independent shutdown control (SHDN1/SHDN2), low 560 µA quiescent current per amplifier, and robust EMIRR performance via integrated EMI/RFI filters on all input and supply pins - critical for noisy industrial environments operating from ±1.35 V to ±20 V or 2.7 V to 40 V supplies.
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 split-supply ±15 V systems without level-shifting. |
| Input Offset Voltage | ±125 µV (max): enables sub-0.1% error in 12-bit current-sense amplification at 40 V full-scale. |
| Gain-Bandwidth Product | 4.5 MHz: sufficient for stable unity-gain buffering of SAR ADC reference signals up to 1 MSPS sampling rates. |
| Slew Rate | 21 V/µs: ensures <2.5 µs settling to 0.01% for 10 V step inputs - critical for fast multiplexed sensor acquisition. |
| CMRR | 130 dB (typ): rejects >99.999% of common-mode noise in high-side current sensing with shunt resistors. |
| Capacitive Load Drive | 1000 pF: eliminates need for isolation resistors when driving ADC input capacitance or long PCB traces. |
| Quiescent Current | 560 µA per amplifier: allows dual-channel precision amplification in battery-backed or energy-constrained PLC modules. |
Pinout & Package
OPA2991IPWR is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.90 mm, with exposed pad optional per thermal design requirements. Pin 4 is V– (negative supply), pin 8 is V+ (positive supply), and both shutdown pins (SHDN1/SHDN2) are absent - confirming this variant is the non-shutdown version of the OPA2991 family.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output: rail-to-rail swing (≤10 mV from rail at no load) supports direct interface to SAR ADC inputs. |
| 2 | IN– A | Inverting input, channel A: accepts differential inputs up to supply rails; compatible with high-voltage multiplexer outputs. |
| 3 | IN+ A | Noninverting input, channel A: MUX-friendly input enables use as comparator or precision buffer in shared-signal paths. |
| 4 | V– | Negative supply terminal: must be connected to lowest system potential; thermal pad (if present) ties to V– per TI layout guidance. |
| 5 | IN+ B | Noninverting input, channel B: independent high-impedance node (±10 pA bias) for dual-sensor conditioning. |
| 6 | IN– B | Inverting input, channel B: matched to channel A for common-mode rejection in differential transducer interfaces. |
| 7 | OUT B | Amplifier B output: identical AC/DC specs to OUT A; supports simultaneous dual-channel acquisition without crosstalk degradation. |
| 8 | V+ | Positive supply terminal: supports up to 40 V rail, enabling direct connection to industrial 24 V bus without regulators. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Input common-mode range extends to V– – 0.1 V and V+ + 0.1 V; output swings within 5 mV of rails at no load - eliminates headroom loss in low-voltage systems. |
| Low noise density | 10.8 nV/√Hz at 1 kHz: preserves SNR in audio preamplifiers and bridge sensor interfaces where 1/f noise dominates. |
| High capacitive load drive | Stable with 1 nF load: removes need for series R-C compensation when driving ADC input capacitance or long cables. |
| MUX-friendly inputs | Differential input voltage tolerance up to supply rails allows direct connection to analog multiplexer outputs without clamping diodes. |
| EMI-hardened inputs | Integrated EMI/RFI filters suppress >80 dB of RF interference at 900 MHz - essential for factory-floor PLCs near VFDs or radio transmitters. |
Applications
| High-Side Current Sensing | Multiplexed Data Acquisition |
|---|---|
Use Scenario: Monitoring motor phase current in a 24-V industrial drive using a 1-mΩ shunt resistor. IC Role / Device Role / Timing Role: Dual-channel OPA2991IPWR buffers and amplifies differential shunt voltage while rejecting common-mode bus noise. Use Value: 130 dB CMRR ensures <10 µV error from 24 V common-mode swing; rail-to-rail output drives 16-bit SAR ADC directly. |
Use Scenario: Scanning 8 thermocouple channels via analog multiplexer into a single ADC. IC Role / Device Role / Timing Role: OPA2991IPWR acts as anti-aliasing filter and gain stage per channel pair before multiplexing. Use Value: 4.5 MHz GBW and 21 V/µs slew rate enable <2.5 µs settling after channel switching - supporting 200 kSPS aggregate throughput. |
| SAR ADC Reference Buffer | Programmable Logic Controller Analog Input |
Use Scenario: Stabilizing a 4.096-V reference for a 16-bit SAR ADC in a test equipment module. IC Role / Device Role / Timing Role: OPA2991IPWR provides low-noise, low-drift unity-gain buffering with 1.8 µVPP 0.1–10 Hz noise. Use Value: ±125 µV offset and ±0.3 µV/°C drift prevent reference drift-induced INL errors across –40°C to 125°C operating range. |
Use Scenario: Conditioning 4–20 mA loop signals and ±10 V sensor outputs in a modular PLC backplane. IC Role / Device Role / Timing Role: Dual OPA2991IPWR channels isolate and scale field signals before digitization. Use Value: 40-V supply range allows direct 24-V loop power integration; ±75 mA output current drives 600-Ω PLC input impedance. |
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 rail-to-rail output. | Better DC precision for lab-grade instrumentation; unsuitable for 24-V PLC analog inputs requiring rail-to-rail swing. | Select OPA2182IDR only when ultra-low offset dominates over supply flexibility and output swing. |
| AD8628ARZ-REEL7 | Zero-drift architecture (0.005 µV/°C drift), but limited bandwidth (2.5 MHz), lower supply (±16.5 V), and no shutdown. | Ideal for microvolt-level thermopile amplification; cannot replace OPA2991IPWR in high-speed multiplexed DAQ due to bandwidth limit. | Choose AD8628ARZ-REEL7 for ultra-stable DC-coupled sensors where speed is secondary to drift performance. |
Compared with OPA2991IPWR, OPA2182IDR trades supply range and rail-to-rail output for superior DC accuracy, while AD8628ARZ-REEL7 sacrifices bandwidth and voltage headroom to achieve near-zero drift - making OPA2991IPWR the balanced choice for industrial 40-V mixed-signal front ends.
Availability
OPA2991IPWR is available at Aetrix Electronics and suitable for high-voltage current sensing, multiplexed data acquisition, and PLC analog input modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA2991IPWR 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 signal chain solutions.
The OPAx991 product line was designed specifically for high-voltage (up to 40 V), precision analog signal conditioning in harsh industrial environments - emphasizing rail-to-rail operation, EMI resilience, and wide temperature support (–40°C to 125°C).
FAQ
What is the maximum supply voltage rating for OPA2991IPWR?
The OPA2991IPWR supports a total supply voltage (V+ to V–) of up to 40 V, with absolute maximum ratings allowing 42 V transient exposure. This enables direct operation from standard 24-V industrial rails or ±15-V lab supplies without external regulation - confirmed in Section 6.1 Absolute Maximum Ratings of the SBOS969F datasheet.
Does OPA2991IPWR include shutdown functionality?
No, OPA2991IPWR does not include shutdown pins. The "IPWR" suffix denotes the SOIC-8 package variant without SHDN pins; shutdown capability is only present in the OPA2991S variants (e.g., OPA2991SIDR with 10-pin VSSOP). This is verified in Table 5-3 (Pin Functions: OPA2991) and Device Information tables, which list no SHDN pins for SOIC-8.
What is the typical input bias current of OPA2991IPWR?
The OPA2991IPWR has a typical input bias current of ±10 pA, as specified in Section 6.7 Electrical Characteristics under "INPUT BIAS CURRENT". This ultra-low value minimizes voltage errors in high-impedance sensor interfaces such as photodiode transimpedance stages or thermocouple cold-junction compensation circuits.
Can OPA2991IPWR drive a 1-nF capacitive load stably?
Yes, the OPA2991IPWR is explicitly characterized to drive up to 1000 pF capacitive loads without oscillation or peaking, as stated in both the Features list ("High capacitive load drive: 1 nF") and Section 6.7 Electrical Characteristics ("CLOAD = 1000 pF"). This eliminates need for isolation resistors when interfacing with ADCs or long PCB traces.
What is the common-mode input voltage range for OPA2991IPWR?
The OPA2991IPWR supports a common-mode input voltage range from (V–) – 0.1 V to (V+) + 0.1 V, per Section 6.7 Electrical Characteristics. This rail-to-rail input capability allows direct connection to multiplexer outputs or sensor bridges operating near supply rails - a key differentiator from legacy op amps with limited input range.
OPA2991IPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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 (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-TSSOP
OPA2991IPWR FAQ
1.How can I place an order for OPA2991IPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2991IPWR 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 OPA2991IPWR reliable?
The price and inventory of OPA2991IPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2991IPWR is usually 5 days.
3.What payment methods are accepted for OPA2991IPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2991IPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2991IPWR?
OPA2991IPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2991IPWR 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 OPA2991IPWR?
For technical support, including OPA2991IPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2991IPWR requirements.
6.How does Aetrix verify that OPA2991IPWR is sourced from the original manufacturer or authorized distributors?
All OPA2991IPWR 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 OPA2991IPWR meets industry standards.
7.What is the process for return or replacement of OPA2991IPWR?
All OPA2991IPWR units undergo pre-shipment inspection (PSI). If there is an issue with OPA2991IPWR, 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 OPA2991IPWR part is unused and in its original packaging.
Return procedure for OPA2991IPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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