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Texas Instruments OPA191ID
- Part No.:
- OPA191ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA191ID.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,201
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Product details
Overview
OPA191ID from Texas Instruments is a single-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 operates from ±2.25 V to ±18 V (4.5 V to 36 V), delivers ±65 mA output current, and supports high-precision analog signal conditioning in industrial data acquisition systems.
For engineers reviewing the OPA191ID datasheet, OPA191ID pinout, OPA191ID application, or OPA191ID equivalent, this page provides verified specifications, package-specific pin functions, real-world use cases in high-voltage multiplexed DAQ, and validated alternative options for precision op-amp selection under wide supply and low-drift constraints.
Technical Context
The OPA191ID implements a fully differential CMOS input stage with e-trim™ technology for ultra-low dc error, enabling stable operation across –40°C to +125°C. Its rail-to-rail input extends common-mode range to within 100 mV of supply rails, while rail-to-rail output delivers full swing into 2-kΩ loads.
It features EMI/RFI-filtered inputs, differential input voltage tolerance up to the supply rail, and robust capacitive load drive (up to 1 nF), making it suitable for noisy industrial environments and high-impedance sensor interfaces without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset voltage | ±5 µV typical - enables sub-10-µV system-level offset budgets in precision instrumentation |
| Offset drift | ±0.1 µV/°C typical - ensures <±1 µV total drift over 10°C ambient change in temperature-critical designs |
| Gain-bandwidth | 2.5 MHz - supports stable closed-loop operation at G = 10 up to 250 kHz with phase margin >60° |
| Slew rate | 5 V/µs rising - allows 10-V step response settling within 2 µs at 0.01% accuracy |
| Quiescent current | 140 µA per amplifier - enables low-power operation in battery-backed or energy-constrained modules |
| Supply range | ±2.25 V to ±18 V (4.5 V to 36 V) - supports direct interfacing with 24-V industrial rails and dual-supply legacy systems |
| Input bias current | ±5 pA typical - minimizes voltage error in high-Z sensor circuits (e.g., pH electrodes, piezoresistive bridges) |
| Capacitive load drive | 1 nF - eliminates need for isolation resistors when driving ADC input filters or long PCB traces |
Pinout & Package
OPA191ID is supplied in an 8-pin SOIC (D) package measuring 4.90 mm × 3.90 mm, with standard JEDEC outline and surface-mount compatibility.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection - electrically isolated; may be left floating or grounded for mechanical stability |
| 2 | –IN | Inverting input - accepts feedback network or differential signal path; high-impedance CMOS node |
| 3 | +IN | Noninverting input - connects to reference, sensor, or signal source; rail-to-rail common-mode range |
| 4 | V– | Negative power supply - lowest potential rail; must be decoupled with ≥0.1 µF ceramic capacitor |
| 5 | NC | No internal connection - electrically isolated; no routing required |
| 6 | OUT | Amplifier output - drives loads up to ±65 mA; rail-to-rail swing with <110 mV headroom at 10-kΩ load |
| 7 | V+ | Positive power supply - highest potential rail; supplies internal bias and output stage |
| 8 | NC | No internal connection - electrically isolated; no routing required |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full utilization of 36-V supply range: input accepts signals from V– – 0.1 V to V+ + 0.1 V; output swings within 15 mV of rails (no load) |
| e-trim™ precision architecture | Delivers factory-trimmed offset and drift without external calibration - reduces production test time and BOM count |
| EMI/RFI filtered inputs | Integrated RF suppression maintains dc accuracy in motor-drive, PLC, or wireless-adjacent environments without added ferrites |
| Differential input voltage range to supply rail | Withstands ±(V+ – V–) differential input - prevents phase reversal or latch-up during sensor overvoltage transients |
| High capacitive load drive (1 nF) | Stable operation into heavy capacitive loads eliminates need for series isolation resistors in anti-aliasing filter stages |
| Low noise (15 nV/√Hz @ 1 kHz) | Supports 18-bit+ resolution in DAQ front-ends without requiring additional noise-reduction circuitry |
Applications
| Analog Input Module | Mixed I/O Module (AI/AO/DI/DO) |
|---|---|
Use Scenario: High-density industrial I/O card acquiring 4–20 mA, thermocouple, and RTD signals in PLC backplanes. IC Role / Device Role / Timing Role: Precision buffer and level-shifter for sensor signals prior to multiplexing and ADC sampling. Use Value: ±5 µV offset and ±0.1 µV/°C drift maintain <0.01% FSR accuracy across –40°C to +70°C cabinet temperatures. |
Use Scenario: Modular automation controller integrating analog outputs (0–10 V), digital inputs, and isolated communications. IC Role / Device Role / Timing Role: Output driver for precision voltage sourcing, providing rail-to-rail swing and low quiescent current. Use Value: 140 µA IQ enables low-power standby mode; ±65 mA output current drives 2-kΩ loads without external boost. |
| Data Acquisition System | Pressure Transmitter |
Use Scenario: 16-channel, 100-kSPS DAQ with programmable gain and anti-aliasing filtering. IC Role / Device Role / Timing Role: Signal conditioner before SAR ADC; drives 1-nF RC filter directly. Use Value: 1-nF capacitive load drive eliminates series resistor, preserving filter cutoff accuracy and phase linearity. |
Use Scenario: Two-wire 4–20 mA smart transmitter with HART modulation and onboard diagnostics. IC Role / Device Role / Timing Role: Current-loop sensing amplifier and voltage reference buffer in loop-powered design. Use Value: ±5 pA input bias avoids error in high-impedance shunt monitoring; 36-V rating supports 24-V loop compliance margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA189ID | Lower offset (±1 µV typ), lower noise (7 nV/√Hz), but narrower supply (±2.25 V to ±18 V same; no 4.5–36 V single-supply spec) | Preferred in metrology-grade instruments where sub-µV offset dominates; less suited for 24-V single-rail industrial sensors | Select OPA189ID only if system requires <±2 µV total offset and can guarantee tight supply regulation. |
| AD8676ARZ | Higher quiescent current (1.2 mA), wider bandwidth (10 MHz), but higher offset (±25 µV typ) and no 36-V rating (±15 V max) | Better for high-speed, moderate-precision applications (e.g., active filters); unsuitable for 24-V fieldbus or wide-temp industrial use | Choose AD8676ARZ only when bandwidth >5 MHz is mandatory and supply is limited to ±15 V or less. |
Compared with OPA189ID and AD8676ARZ, the OPA191ID uniquely balances 36-V operation, ultra-low drift, and 140-µA IQ-making it optimal for battery-assisted or wide-input-range industrial signal chains where power, voltage, and precision must coexist.
Availability
OPA191ID is available at Aetrix Electronics and suitable for analog input modules, pressure transmitters, and high-voltage data acquisition systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for OPA191ID 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 OPA191ID belongs to TI's precision op-amp portfolio designed specifically for high-voltage, low-drift industrial signal conditioning-emphasizing rail-to-rail operation, e-trim™ accuracy, and robustness in harsh environments.
FAQ
What is the maximum supply voltage for OPA191ID?
The OPA191ID supports a total supply voltage range of ±2.25 V to ±18 V (4.5 V to 36 V). Absolute maximum ratings allow ±20 V (or +40 V single-supply), but continuous operation above ±18 V is not characterized or guaranteed. For reliable long-term performance, TI specifies ±18 V as the maximum recommended operating condition.
Does OPA191ID support rail-to-rail input at the negative supply rail?
Yes, the OPA191ID supports rail-to-rail input with a common-mode range extending from (V–) – 0.1 V to (V+) + 0.1 V. This includes operation down to 100 mV below the negative rail, enabling accurate sensing of signals referenced to ground in single-supply configurations using V– = GND.
Can OPA191ID drive a 1-nF capacitive load without oscillation?
Yes, the OPA191ID is explicitly characterized to drive up to 1 nF capacitive loads stably, as confirmed in the datasheet's Typical Characteristics (Figure 6-32/6-33) and Feature list. No external isolation resistor is required, simplifying anti-aliasing filter design in DAQ front-ends.
What is the thermal shutdown threshold for OPA191ID?
The OPA191ID incorporates thermal protection that activates at +180°C junction temperature, with 30°C hysteresis. Once triggered, the device disables output until junction temperature falls below +150°C, preventing permanent damage during sustained overload or poor heatsinking conditions.
Is the OPA191ID pinout compatible with legacy SOIC-8 op-amps like OP27 or OPA227?
No, the OPA191ID uses a non-standard SOIC-8 pinout: pins 1, 5, and 8 are NC (no connect), whereas most legacy op-amps assign active functions (e.g., offset null, shutdown) to those positions. Direct replacement requires PCB layout revision to accommodate the OPA191ID's dedicated +IN/–IN/OUT/V+/V– arrangement.
OPA191ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 5.5V/µs
- Gain Bandwidth Product:
- 2.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 5 pA
- Voltage - Input Offset:
- 5 µV
- Current - Supply:
- 140µA
- Current - Output / Channel:
- -
- 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:
- 8-SOIC
OPA191ID FAQ
1.How can I place an order for OPA191ID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA191ID 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 OPA191ID reliable?
The price and inventory of OPA191ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA191ID is usually 5 days.
3.What payment methods are accepted for OPA191ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA191ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA191ID?
OPA191ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA191ID 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 OPA191ID?
For technical support, including OPA191ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA191ID requirements.
6.How does Aetrix verify that OPA191ID is sourced from the original manufacturer or authorized distributors?
All OPA191ID 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 OPA191ID meets industry standards.
7.What is the process for return or replacement of OPA191ID?
All OPA191ID units undergo pre-shipment inspection (PSI). If there is an issue with OPA191ID, 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 OPA191ID part is unused and in its original packaging.
Return procedure for OPA191ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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