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Texas Instruments OPA4191IRUMT
- Part No.:
- OPA4191IRUMT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
OPA4191IRUMT.pdf
- Description:
- IC CMOS 4 CIRCUIT 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:211
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Product details
Overview
OPA4191IRUMT from Texas Instruments is a quad-channel, 36-V, precision CMOS operational amplifier with rail-to-rail input/output, ±5 µV max offset voltage, ±0.1 µV/°C drift, and 140 dB CMRR - deployed in high-accuracy analog input modules and data acquisition systems requiring low bias current (±5 pA) and stable performance across –40°C to +125°C.
For engineers reviewing the OPA4191IRUMT datasheet, OPA4191IRUMT pinout, OPA4191IRUMT application, or OPA4191IRUMT equivalent, this page delivers verified specifications, WQFN-16 package details, real-world use cases in pressure transmitters and SMUs, and validated alternative options for industrial signal conditioning designs.
Technical Context
The OPA4191IRUMT implements a precision e-trim™ CMOS architecture optimized for high-voltage industrial sensing, supporting ±2.25 V to ±18 V (or 4.5 V to 36 V) dual/single supply operation. Its differential input voltage range extends to the supply rails, enabling robust interfacing with bridge sensors and thermocouples without external level-shifting.
It delivers 2.5-MHz gain-bandwidth, 5 V/µs slew rate, and 1 nF capacitive load drive capability - critical for stable closed-loop operation in multiplexed DAQ front-ends where channel crosstalk must remain below –130 dB at 100 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±2.25 V to ±18 V (4.5 V to 36 V) - supports wide industrial input ranges and single-supply battery-powered instrumentation |
| Input Offset Voltage | ±5 µV (max) - enables sub-0.001% accuracy in 16-bit+ measurement systems without calibration |
| Offset Drift | ±0.1 µV/°C (typ) - ensures <1 µV total drift over 85°C ambient span, critical for unattended field deployments |
| CMRR | 140 dB (min) - rejects common-mode noise from motor drives or long sensor cables in noisy factory environments |
| Input Bias Current | ±5 pA (max) - preserves signal integrity when amplifying high-impedance sources like piezoresistive pressure sensors |
| GBW & Slew Rate | 2.5 MHz / 5 V/µs - supports 100-kSPS sampling with ≤0.01% settling error in anti-aliasing filter stages |
| Quiescent Current | 140 µA per amplifier - allows four-channel precision amplification within 600 µA total, ideal for low-power remote nodes |
Pinout & Package
OPA4191IRUMT is housed in a 16-pin WQFN package (4.00 mm × 4.00 mm) with exposed thermal pad, optimized for thermal performance (RθJA = 33.0°C/W) and PCB space efficiency in compact industrial modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 8, 12 | Inverting Input (A–D) | Four independent negative inputs; each accepts rail-to-rail common-mode voltage up to supply rails |
| 2, 4, 9, 11 | Noninverting Input (A–D) | Four independent positive inputs; EMI-filtered for robustness in electrically noisy environments |
| 3, 6, 7, 14 | Output (A–D) | Four buffered outputs capable of ±65 mA drive and 1 nF capacitive load stability |
| 10 | V– | Negative supply terminal; supports operation down to –18 V or ground in single-supply configurations |
| 3 | V+ | Positive supply terminal; accepts up to +18 V or +36 V in single-supply mode |
| 13, 16 | NC | No internal connection; must be left floating or tied to ground per layout guidelines |
| Thermal Pad | Case Ground / Heat Path | Exposed copper pad requires solder connection to PCB thermal plane for reliable 125°C operation |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Enables full-scale signal utilization across entire supply range - eliminates headroom loss in 3.3 V or 24 V systems |
| e-trim™ DC precision | Factory-trimmed offset and drift eliminate need for system-level calibration in production test flow |
| High capacitive load drive (1 nF) | Stable operation into anti-aliasing filters or long traces without external compensation components |
| Differential input voltage to rail | Accepts input signals beyond supply rails by 0.1 V - simplifies interface with overvoltage-prone sensors |
| EMI/RFI filtered inputs | Integrated filtering suppresses >1 GHz RF interference from switch-mode power supplies and wireless comms |
Applications
| Analog Input Module | Mixed I/O Module (AI/AO/DI/DO) |
|---|---|
Use Scenario: 16-channel isolated analog input card for PLC backplanes handling 4–20 mA, ±10 V, and thermocouple inputs. IC Role / Device Role / Timing Role: Precision front-end amplifier for each channel, providing gain, filtering, and rail-to-rail buffering before ADC sampling. Use Value: ±5 µV offset and 140 dB CMRR ensure <0.005% total error across temperature, meeting IEC 61000-6-2 immunity requirements. | Use Scenario: Modular industrial I/O base supporting simultaneous analog input, analog output, digital input, and digital output on one PCB. IC Role / Device Role / Timing Role: Quad op-amp provides independent signal conditioning for AI channels while sharing V+ and V– rails with other subsystems. Use Value: 140 µA per amplifier enables full quad operation under 600 µA, preserving headroom for DAC drivers and isolators in tight power budgets. |
| Data Acquisition System | Pressure Transmitter |
Use Scenario: High-resolution portable DAQ unit with multiplexed 24-bit sigma-delta ADC and programmable gain. IC Role / Device Role / Timing Role: Buffer and drive anti-aliasing filter for each multiplexed channel; maintains low crosstalk (<–130 dB @ 100 kHz). Use Value: 2.5-MHz GBW and 5 V/µs slew rate achieve 0.01% settling in <1 µs, enabling 1 MSPS effective throughput with oversampling. | Use Scenario: Two-wire 4–20 mA smart pressure transmitter with HART modulation and onboard diagnostics. IC Role / Device Role / Timing Role: Amplifies mV-level bridge output, conditions for ADC, and drives loop current with precision reference buffering. Use Value: ±5 pA input bias prevents zero-shift in high-Z Wheatstone bridges; rail-to-rail output ensures full 4–20 mA compliance range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4182IPWR | Lower offset drift (±0.02 µV/°C), higher quiescent current (490 µA), same WQFN-16 package | Better for ultra-stable lab instruments; less suitable for battery-powered field units due to 3.5× higher IQ | Select when drift-critical metrology outweighs power constraints |
| AD8628ARUZ-REEL | Chopper-stabilized (0.05 µV offset), lower bandwidth (2.5 MHz), SOIC-14 only - no WQFN option | Superior DC accuracy but higher 1/f noise; unsuitable for AC-coupled sensor interfaces above 10 Hz | Select when microvolt-level offset dominates over noise and bandwidth needs |
Compared with OPA4191IRUMT, OPA4182IPWR trades higher power for lower drift in metrology-grade systems, while AD8628ARUZ-REEL offers chopper-based zero-drift but sacrifices AC performance and package flexibility - making OPA4191IRUMT optimal for balanced industrial DAQ where precision, speed, and power coexist.
Availability
OPA4191IRUMT is available at Aetrix Electronics and suitable for analog input modules, pressure transmitters, and data acquisition systems requiring stable component supply, extended temperature support (–40°C to +125°C), and long-term industrial lifecycle assurance.
Supply support for OPA4191IRUMT 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The OPAx191 family was engineered for high-voltage precision signal conditioning in harsh industrial environments - emphasizing rail-to-rail operation, low drift, and robust EMI immunity in compact packages.
FAQ
What is the maximum capacitive load the OPA4191IRUMT can drive stably?
The OPA4191IRUMT is specified to drive up to 1 nF capacitive load while maintaining stability without external compensation. This capability is confirmed in the datasheet's Typical Characteristics section (Figure 6-32/6-33) and enables direct connection to anti-aliasing filters or long PCB traces in DAQ front-ends. Performance holds across –40°C to +125°C and all supported supply voltages.
Does the OPA4191IRUMT support single-supply operation?
Yes, the OPA4191IRUMT supports true single-supply operation from 4.5 V to 36 V. Its rail-to-rail input and output stages allow common-mode and output voltage swings within 15 mV of either rail (at RL = 10 kΩ), making it suitable for 3.3 V, 5 V, 12 V, and 24 V systems without level-shifting circuitry.
What is the thermal resistance (RθJA) of the OPA4191IRUMT in its WQFN-16 package?
The OPA4191IRUMT in the RUM (WQFN-16) package has a junction-to-ambient thermal resistance (RθJA) of 33.0°C/W, as specified in Section 6.6 of the datasheet. This value assumes standard JEDEC 2-layer board conditions and benefits significantly from proper thermal pad soldering to an internal copper plane.
How does the OPA4191IRUMT handle input overvoltage conditions?
The OPA4191IRUMT features a differential input voltage range extending to the supply rails (V– – 0.1 V to V+ + 0.1 V), allowing safe operation with inputs exceeding the supply by up to 0.1 V. This protects against transient overvoltage from inductive sensors or cable discharge events without requiring external clamping diodes.
Is the OPA4191IRUMT pin-compatible with other members of the OPAx191 family?
No - the OPA4191IRUMT (WQFN-16) is not pin-compatible with the SOIC-14 or TSSOP-14 variants of OPA4191. Pin counts, layouts, and terminal assignments differ: RUM uses 16 pins with exposed thermal pad and NC placements distinct from 14-pin packages. Migration requires PCB redesign and layout validation per Section 5 of the datasheet.
OPA4191IRUMT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 7.5V/µs
- Gain Bandwidth Product:
- 2.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 5 pA
- Voltage - Input Offset:
- 5 µV
- Current - Supply:
- 140µA (x4 Channels)
- Current - Output / Channel:
- 65 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WQFN (4x4)
OPA4191IRUMT FAQ
1.How can I place an order for OPA4191IRUMT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4191IRUMT 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 OPA4191IRUMT reliable?
The price and inventory of OPA4191IRUMT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4191IRUMT is usually 5 days.
3.What payment methods are accepted for OPA4191IRUMT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4191IRUMT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4191IRUMT?
OPA4191IRUMT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4191IRUMT 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 OPA4191IRUMT?
For technical support, including OPA4191IRUMT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4191IRUMT requirements.
6.How does Aetrix verify that OPA4191IRUMT is sourced from the original manufacturer or authorized distributors?
All OPA4191IRUMT 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 OPA4191IRUMT meets industry standards.
7.What is the process for return or replacement of OPA4191IRUMT?
All OPA4191IRUMT units undergo pre-shipment inspection (PSI). If there is an issue with OPA4191IRUMT, 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 OPA4191IRUMT part is unused and in its original packaging.
Return procedure for OPA4191IRUMT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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