My Inquiry
My Account
Texas Instruments OPA4191ID
- Part No.:
- OPA4191ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4191ID.pdf
- Description:
- IC CMOS 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:243
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
OPA4191ID from Texas Instruments is a quad, 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 systems.
For engineers reviewing the OPA4191ID datasheet, OPA4191ID pinout, OPA4191ID application, or OPA4191ID equivalent, this page provides verified specifications, SOIC-14 package details, real-world use cases in pressure transmitters and source measurement units, and two validated alternative parts for design flexibility.
Technical Context
The OPA4191ID implements e-trim™ technology for outstanding DC precision and operates across ±2.25 V to ±18 V (or 4.5 V to 36 V) supplies. Its differential input voltage range extends to the supply rails, supporting robust operation in high-common-mode-voltage sensor interfaces.
Each of its four amplifiers features independent rail-to-rail output swing, 5 V/µs slew rate, ±65 mA short-circuit current capability, and stable drive into 1 nF capacitive loads-enabling direct connection to ADC drivers and multiplexed analog front-ends without external compensation.
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 power rails including 24-V systems and dual-supply instrumentation. |
| Input Offset Voltage | ±5 µV (typ): enables sub-10-µV system-level offset budgets in precision bridge sensor amplification. |
| Offset Drift | ±0.1 µV/°C (typ, 0°C to 85°C): ensures <1 µV total drift over 50°C ambient change-critical for uncalibrated field instruments. |
| Gain-Bandwidth Product | 2.5 MHz: allows stable unity-gain buffering of 100-kHz signals with >60° phase margin into 10-kΩ//100-pF loads. |
| Common-Mode Rejection | 140 dB (typ, VS = ±18 V): rejects >100-µV common-mode error from 10-V CM signal-essential in high-side current sensing. |
| Quiescent Current | 140 µA per amplifier: enables ultra-low-power operation in battery-backed DAQ modules with four active channels. |
| Capacitive Load Drive | 1 nF: eliminates need for isolation resistors when driving SAR ADC inputs or long PCB traces. |
Pinout & Package
OPA4191ID is supplied in a 14-pin SOIC package (body size 8.65 mm × 3.90 mm) with standard pin spacing and thermal performance (RθJA = 86.4°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 14 | OUT A / OUT D | Amplifier A and D outputs: rail-to-rail capable, ±65 mA drive, directly interface to ADC reference buffers or DAC output stages. |
| 2, 13 | –IN A / –IN D | Inverting inputs: high-impedance (10¹³ Ω), EMI-filtered, support differential input configurations without external RC networks. |
| 3, 12 | +IN A / +IN D | Noninverting inputs: rail-to-rail common-mode range (V– – 0.1 V to V+ + 0.1 V), ideal for high-side shunt monitoring. |
| 4 | V+ | Positive supply: connects to highest potential rail; must be decoupled with ≥100 nF ceramic capacitor near pin. |
| 5, 10 | +IN B / +IN C | Noninverting inputs for channels B and C: identical electrical specs to pins 3/12; enable synchronous multi-channel sensor conditioning. |
| 6, 9 | –IN B / –IN C | Inverting inputs for channels B and C: matched bias current (±5 pA) minimizes offset error in parallel-configured instrumentation amps. |
| 7, 8 | OUT B / OUT C | Amplifier B and C outputs: fully independent; allow simultaneous filtering, gain, and level-shifting of four analog signals on one IC. |
| 11 | V– | Negative supply: connects to lowest potential rail; supports true bipolar operation down to –18 V or single-supply ground-referenced use. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal utilization across entire supply range-no headroom loss in 3.3-V or 24-V systems. |
| EMI/RFI filtered inputs | Reduces susceptibility to 400-MHz–2-GHz RF interference without external ferrite beads or LC filters. |
| Differential input voltage range to supply rail | Permits input overvoltage up to V+ or V– without phase reversal or latch-up-critical in fault-prone industrial I/O modules. |
| High capacitive load drive (1 nF) | Eliminates stability concerns when driving anti-aliasing filters, long cables, or switched-capacitor ADC inputs. |
| Low input bias current (±5 pA) | Preserves signal integrity in high-impedance pH electrodes, piezoelectric sensors, and photodiode transimpedance stages. |
Applications
| Analog Input Module | Mixed Module (AI, AO, DI, DO) |
|---|---|
Use Scenario: 16-channel isolated analog input card for PLC backplane with 24-bit sigma-delta ADCs and cold-junction compensation. IC Role / Device Role / Timing Role: OPA4191ID serves as programmable-gain instrumentation amplifier front-end for thermocouple and RTD inputs, providing rail-to-rail buffering before multiplexing. Use Value: ±5 µV offset and 140-dB CMRR ensure <0.005% reading error over –40°C to +85°C ambient without per-channel calibration. | Use Scenario: Modular I/O base unit integrating analog inputs, analog outputs, digital inputs, and relay drivers in a single DIN-rail enclosure. IC Role / Device Role / Timing Role: OPA4191ID conditions sensor signals (pressure, flow, temperature) and drives analog output stages via precision voltage-to-current conversion. Use Value: Quad configuration reduces component count by 75% versus discrete op-amp solutions while maintaining channel-to-channel crosstalk <130 dB at 100 kHz. |
| Data Acquisition (DAQ) | Source Measurement Unit (SMU) |
Use Scenario: Portable handheld DAQ with 8-channel simultaneous sampling, 100-kS/s throughput, and battery operation. IC Role / Device Role / Timing Role: OPA4191ID performs anti-aliasing filtering, gain scaling, and level shifting for each channel prior to ADC sampling. Use Value: 140-µA per-amplifier quiescent current enables >8-hour runtime on 2000-mAh Li-ion battery with all four channels active. | Use Scenario: Benchtop SMU for semiconductor parametric testing requiring ±200-V compliance, 100-pA measurement resolution, and fast settling. IC Role / Device Role / Timing Role: OPA4191ID implements feedback control loops for voltage sourcing and current sinking, with overload recovery in <1 µs. Use Value: 5 V/µs slew rate and 0.7-µs 0.01% settling time enable accurate pulse-width-modulated sourcing with minimal transient error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4182IPW | Lower offset drift (±0.02 µV/°C), higher GBW (10 MHz), but higher IQ (450 µA/channel) and no EMI filtering. | Better for lab-grade metrology where drift dominates; less suitable for battery-powered field instruments. | Select OPA4182IPW when absolute long-term stability outweighs power budget constraints. |
| AD8629ARZ | Zero-drift architecture, lower noise (12 nV/√Hz), but narrower supply (±2.5 V to ±16 V) and lower output drive (±20 mA). | Ideal for low-voltage, ultra-low-noise medical sensor front-ends; insufficient for 24-V industrial actuator interfaces. | Choose AD8629ARZ for sub-1-µV offset-critical applications below 16-V supply; avoid for high-output-current or wide-supply needs. |
Compared with OPA4191ID, OPA4182IPW trades 3× higher quiescent current for 5× lower drift and 4× higher bandwidth, while AD8629ARZ offers zero-drift correction at the cost of reduced supply range and output current-making OPA4191ID the optimal balance for ruggedized, wide-supply industrial DAQ.
Availability
OPA4191ID 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 OPA4191ID 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-including OPA4191ID-is designed specifically for high-voltage, high-precision industrial signal conditioning, emphasizing rail-to-rail operation, ultra-low drift, and robustness in harsh electromagnetic environments.
FAQ
What is the maximum supply voltage for OPA4191ID?
The OPA4191ID supports a maximum supply voltage of ±20 V (or +40 V single supply), with recommended operation from ±2.25 V to ±18 V (4.5 V to 36 V). Absolute maximum ratings must not be exceeded during transient events or power sequencing-designers should implement clamping or soft-start circuits if inrush or back-EMF risks exist in the target application.
Does OPA4191ID support rail-to-rail input and output simultaneously?
Yes, OPA4191ID supports true rail-to-rail input (common-mode range extends from V– – 0.1 V to V+ + 0.1 V) and rail-to-rail output (swing within 15 mV of either rail under light load). This enables full dynamic range utilization in both single-supply and split-supply configurations-critical for maximizing SNR in 16-bit+ data acquisition systems using the OPA4191ID.
What is the thermal resistance (RθJA) of OPA4191ID in SOIC-14 package?
The junction-to-ambient thermal resistance (RθJA) for OPA4191ID in the SOIC-14 (D) package is 86.4°C/W, measured under JEDEC JESD51-7 standard conditions. This value assumes a 2-layer board with 1-in² copper pour per side; actual thermal performance improves with internal ground/power planes and thermal vias-important for sustained 125°C operation in enclosed industrial enclosures.
Can OPA4191ID drive a 1-nF capacitive load without oscillation?
Yes, OPA4191ID is explicitly characterized to drive up to 1 nF capacitive loads stably, as confirmed in the datasheet's Typical Characteristics section (Figure 6-32/6-33). This capability eliminates the need for series isolation resistors when interfacing with anti-aliasing filters, ADC input capacitance, or long PCB traces-reducing component count and preserving signal fidelity in OPA4191ID-based designs.
What is the input bias current specification for OPA4191ID at 125°C?
At TA = –40°C to +125°C, the input bias current for OPA4191ID is specified as ±9 nA maximum. This elevated value-compared to the ±5 pA typical at 25°C-reflects CMOS input stage leakage behavior and must be accounted for in high-impedance sensor interfaces (e.g., >10 MΩ sources) operating at maximum temperature, where it contributes up to ~90 µV of additional offset error.
OPA4191ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 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:
- 14-SOIC
OPA4191ID FAQ
1.How can I place an order for OPA4191ID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4191ID 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 OPA4191ID reliable?
The price and inventory of OPA4191ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4191ID is usually 5 days.
3.What payment methods are accepted for OPA4191ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4191ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4191ID?
OPA4191ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4191ID 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 OPA4191ID?
For technical support, including OPA4191ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4191ID requirements.
6.How does Aetrix verify that OPA4191ID is sourced from the original manufacturer or authorized distributors?
All OPA4191ID 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 OPA4191ID meets industry standards.
7.What is the process for return or replacement of OPA4191ID?
All OPA4191ID units undergo pre-shipment inspection (PSI). If there is an issue with OPA4191ID, 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 OPA4191ID part is unused and in its original packaging.
Return procedure for OPA4191ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA4191ID 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…
