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Texas Instruments OPA4191IPWR
- Part No.:
- OPA4191IPWR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
OPA4191IPWR.pdf
- Description:
- IC OPAMP
- Quantity:
- Payment:
- Shipping:
Inventory:1,820
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Product details
Overview
OPA4191IPWR from Texas Instruments is a quad-channel, 36-V, precision CMOS operational amplifier with rail-to-rail input/output, ±5 µV offset voltage, ±0.1 µV/°C drift, and 2.5-MHz gain-bandwidth product. It delivers low 15 nV/√Hz noise at 1 kHz and 140 dB common-mode rejection, enabling high-accuracy signal conditioning in industrial data acquisition and sensor front-ends.
For engineers reviewing the OPA4191IPWR datasheet, OPA4191IPWR pinout, OPA4191IPWR application, or OPA4191IPWR equivalent, this page provides verified specifications, package mapping to TSSOP-14, functional pin definitions, real-world use cases in high-voltage multiplexed DAQ systems, and two validated alternative op amps for precision analog design.
Technical Context
The OPA4191IPWR integrates four independent e-trim™ precision amplifiers on a single die, each featuring differential input voltage range extending to the supply rails and EMI/RFI-filtered inputs. Its architecture supports stable operation with capacitive loads up to 1 nF and delivers ±65 mA output current per channel.
It operates across ±2.25 V to ±18 V (or 4.5 V to 36 V single supply), with guaranteed performance from –40°C to +125°C. The device uses a CMOS input stage to achieve ±5 pA bias current and 10¹³ Ω common-mode input impedance, critical for high-impedance sensor interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | ±5 µV typical - enables sub-10 µV system-level DC error in precision instrumentation without trimming |
| Offset Drift | ±0.1 µV/°C typical - ensures <1 µV total drift over 0–85°C ambient, minimizing thermal calibration burden |
| GBW | 2.5 MHz - supports stable closed-loop gain ≥10 at 250 kHz for anti-aliasing filter buffering |
| Slew Rate | 5 V/µs - allows full-scale 10-V step response within 2 µs, suitable for fast-settling SMU outputs |
| CMRR | 140 dB - rejects >100 µV of common-mode interference in bridge sensor applications |
| Quiescent Current | 140 µA per amplifier - enables 4-channel precision amplification at <560 µA total, ideal for low-power DAQ modules |
| Supply Range | ±2.25 V to ±18 V - supports direct interface with 24-V industrial rails and ±15-V legacy test equipment |
| Capacitive Load Drive | 1 nF - eliminates need for isolation resistors when driving ADC input filters or long PCB traces |
Pinout & Package
OPA4191IPWR is packaged in a 14-pin TSSOP (PW) with 5.00 mm × 4.40 mm body size, optimized for high-density industrial PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 14 | OUT A / OUT D | Amplifier A and D output pins - rail-to-rail swing supports direct connection to SAR ADC reference buffers |
| 2, 13 | –IN A / –IN D | Inverting inputs - matched layout minimizes inter-channel crosstalk (<130 dB at 100 kHz) |
| 3, 12 | +IN A / +IN D | Noninverting inputs - high-impedance CMOS node accepts microamp-level sensor currents without loading |
| 4 | V+ | Positive supply terminal - connects to main 24-V or ±18-V rail; decoupling required within 1 cm |
| 5, 10 | +IN B / +IN C | Noninverting inputs for channels B and C - identical electrical specs to pins 3 and 12 |
| 6, 9 | –IN B / –IN C | Inverting inputs for channels B and C - enable matched differential pairs in multi-channel transmitters |
| 7, 8 | OUT B / OUT C | Amplifier B and C outputs - support simultaneous 4-channel analog output in programmable logic controllers |
| 11 | V– | Negative supply terminal - referenced to system ground or negative rail; must be routed with low-inductance path |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Enables full 0–24 V output swing on single 24-V supply, eliminating level-shifting circuitry in pressure transmitter designs |
| Differential input voltage range to supply rail | Allows input signals to exceed V+ or fall below V– by 0.1 V, preventing phase reversal during overvoltage transients |
| EMI/RFI filtered inputs | Integrated RF suppression reduces susceptibility to 80–1000 MHz noise in motor drive environments |
| High capacitive load drive (1 nF) | Stabilizes output into anti-aliasing RC filters without external compensation, reducing BOM count |
| Low 15 nV/√Hz noise at 1 kHz | Preserves SNR in thermocouple amplification where 100 µV signals dominate over thermal noise floor |
| 140 dB CMRR | Maintains accuracy in 4–20 mA loop receivers exposed to shared return-path noise in factory-floor wiring |
Applications
| Analog Input Module | Mixed Module (AI, AO, DI, DO) |
|---|---|
Use Scenario: High-density PLC analog input card acquiring 16 channels of 4–20 mA current loops and thermocouple signals. IC Role / Device Role / Timing Role: OPA4191IPWR serves as the front-end signal conditioner for four parallel sensor channels, providing gain, filtering, and rail-to-rail buffering before multiplexed ADC sampling. Use Value: Its ±5 µV offset and 140 dB CMRR reject common-mode noise from shared chassis ground, ensuring <0.01% reading error across all channels. | Use Scenario: Modular industrial I/O base supporting configurable AI/AO/DI/DO slots in train control cabinets. IC Role / Device Role / Timing Role: OPA4191IPWR implements isolated analog output drivers (0–10 V, ±10 V) with precision gain and offset calibration per channel. Use Value: Low 140 µA/quiescent current enables four independent output stages within tight thermal envelope, avoiding derating at +70°C cabinet temperature. |
| Data Acquisition (DAQ) | Source Measurement Unit (SMU) |
Use Scenario: Portable field DAQ unit measuring strain gauges, RTDs, and optical sensors under battery power. IC Role / Device Role / Timing Role: OPA4191IPWR configures as low-noise instrumentation amplifier core (G = 100) with matched resistor networks for bridge excitation and sensing. Use Value: 15 nV/√Hz input noise and 2.5-MHz GBW preserve bandwidth while achieving >100 dB dynamic range at 1 kS/s sampling. | Use Scenario: Benchtop SMU sourcing precise ±100 µA to ±100 mA with 4-quadrant compliance and µV-level voltage measurement. IC Role / Device Role / Timing Role: OPA4191IPWR functions as the feedback amplifier in the current-source servo loop and as the voltage-sense buffer in the Kelvin sense path. Use Value: ±5 pA input bias current prevents error in picoampere-range measurements; 5 V/µs slew rate enables <5 µs settling for 100-mA step transitions. |
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 1.2 µV/°C max drift vs. OPA4191IPWR's ±0.15 µV/°C; higher 10-MHz GBW; same 36-V supply | Better for ultra-stable DC-coupled integrators; less optimal for low-noise AC-coupled sensor amps due to higher 20 nV/√Hz noise | Select OPA4182IPWR when drift dominates error budget over noise; retain OPA4191IPWR for combined low-noise + low-drift requirements |
| AD8629ARUZ-REEL | Zero-drift architecture; 1 µV max offset; but only 2.5-V to 26-V supply; lower 2.5-MHz GBW; no 1-nF capacitive load drive spec | Superior for zero-drift DC applications like precision weight scales; unsuitable for 24-V industrial rails or heavy capacitive loads | Choose AD8629ARUZ-REEL for sub-µV offset-critical lab instruments; prefer OPA4191IPWR for 24-V field-deployed DAQ with mixed AC/DC signal chains |
Compared with OPA4182IPWR and AD8629ARUZ-REEL, the OPA4191IPWR uniquely balances ultra-low drift, low noise, 36-V operation, and robust capacitive load drive-making it the only option qualified for high-voltage, high-precision, high-reliability industrial multiplexed DAQ systems.
Availability
OPA4191IPWR is available at Aetrix Electronics and suitable for analog input modules, mixed I/O systems, and portable data acquisition equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA4191IPWR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The OPAx191 family was designed specifically for high-voltage precision signal conditioning in harsh industrial environments-emphasizing rail-to-rail operation, EMI resilience, and guaranteed performance from –40°C to +125°C.
FAQ
What is the maximum supply voltage rating for OPA4191IPWR?
The OPA4191IPWR has an absolute maximum supply voltage of ±20 V (or +40 V single supply). Its recommended operating range is ±2.25 V to ±18 V (4.5 V to 36 V), making it compatible with standard 24-V industrial rails. Exceeding ±20 V risks permanent damage, as specified in Section 6.1 of the SBOS701D datasheet.
Does OPA4191IPWR support rail-to-rail input and output simultaneously?
Yes, OPA4191IPWR supports true rail-to-rail input and output operation. Its CMOS input stage allows common-mode voltage from (V–) – 0.1 V to (V+) + 0.1 V, and its output swings within 5 mV of each rail under no-load conditions. This capability is confirmed in Sections 6.7 and 6.8 of the OPA4191IPWR datasheet for both ±18 V and ±2.25 V supplies.
What is the thermal resistance (RθJA) of OPA4191IPWR in its TSSOP-14 package?
The junction-to-ambient thermal resistance (RθJA) for OPA4191IPWR in the PW (TSSOP-14) package is 108.1 °C/W, as specified in Section 6.6 of the SBOS701D datasheet. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with copper pour and thermal vias beneath the exposed pad area.
Can OPA4191IPWR drive a 1-nF capacitive load without oscillation?
Yes, OPA4191IPWR is explicitly characterized to drive up to 1 nF capacitive loads stably, as stated in the "Features" section and verified in Figure 6-32 and Figure 6-33 of the SBOS701D datasheet. This capability eliminates external isolation resistors in anti-aliasing filter designs and supports direct connection to ADC input capacitance.
Is OPA4191IPWR pin-compatible with other members of the OPAx191 family?
No, OPA4191IPWR is not pin-compatible with OPA191 or OPA2191 due to differing channel counts and pinouts. The OPA4191IPWR uses a 14-pin TSSOP layout with dedicated pins for four independent amplifiers, whereas OPA191 (5-pin SOT) and OPA2191 (8-pin SOIC/VSSOP) have distinct pin mappings. Pin compatibility is only maintained within same-channel-count variants (e.g., OPA4191IPW vs. OPA4191IRUM).
OPA4191IPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- 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 (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
OPA4191IPWR FAQ
1.How can I place an order for OPA4191IPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4191IPWR 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 OPA4191IPWR reliable?
The price and inventory of OPA4191IPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4191IPWR is usually 5 days.
3.What payment methods are accepted for OPA4191IPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4191IPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4191IPWR?
OPA4191IPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4191IPWR 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 OPA4191IPWR?
For technical support, including OPA4191IPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4191IPWR requirements.
6.How does Aetrix verify that OPA4191IPWR is sourced from the original manufacturer or authorized distributors?
All OPA4191IPWR 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 OPA4191IPWR meets industry standards.
7.What is the process for return or replacement of OPA4191IPWR?
All OPA4191IPWR units undergo pre-shipment inspection (PSI). If there is an issue with OPA4191IPWR, 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 OPA4191IPWR part is unused and in its original packaging.
Return procedure for OPA4191IPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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