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Texas Instruments OPA191IDGKR
- Part No.:
- OPA191IDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA191IDGKR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,879
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Product details
Overview
OPA191IDGKR from Texas Instruments is a single-channel, 36-V, precision CMOS operational amplifier with rail-to-rail input/output, ±5 µV offset voltage, ±5 pA input bias current, 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 drive, and supports high-precision analog signal conditioning in industrial data acquisition and sensor front-ends.
For engineers reviewing the OPA191IDGKR datasheet, OPA191IDGKR pinout, OPA191IDGKR application, or OPA191IDGKR equivalent, key selection criteria include ultra-low offset drift (±0.1 µV/°C), EMI/RFI-filtered inputs, differential input voltage range to supply rail, and verified 1-nF capacitive load drive capability in the VSSOP-8 package.
Technical Context
The OPA191IDGKR employs e-trim™ technology for outstanding DC precision and features a robust CMOS input stage enabling rail-to-rail common-mode operation down to (V–) – 0.1 V and up to (V+) + 0.1 V. Its high slew rate (5 V/µs) and 2.5-MHz GBW support fast settling in precision instrumentation loops.
It integrates differential input-voltage range extending to the supply rails, high output current (±65 mA), and stable operation into 1-nF loads-enabling direct interface with ADC drivers, bridge sensor amplifiers, and high-voltage multiplexed analog inputs 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 precision signal chains. |
| Input Offset Voltage | ±5 µV (typ): Enables sub-16-bit accuracy in 10-V full-scale systems without calibration. |
| Offset Drift | ±0.1 µV/°C (typ): Ensures <1 µV total drift over 0°C–85°C ambient, critical for uncalibrated field instrumentation. |
| Input Bias Current | ±5 pA (typ): Allows use with high-impedance sources (e.g., pH electrodes, piezoresistive sensors) without significant error. |
| Gain-Bandwidth Product | 2.5 MHz: Sustains closed-loop stability at G = 1 with ≥100 kHz small-signal bandwidth for anti-aliasing filter interfaces. |
| Slew Rate | 5 V/µs: Supports ≤200-ns 10-V step response, suitable for fast-settling SMU and DAQ channel switching. |
| Capacitive Load Drive | 1 nF: Eliminates need for isolation resistors when driving SAR ADC inputs or long PCB traces. |
| Quiescent Current | 140 µA per amplifier: Enables low-power operation in battery-backed or energy-constrained modules. |
Pinout & Package
VSSOP-8 (DGK) package: 3.00 mm × 3.00 mm body, 0.65-mm lead pitch, exposed pad optional (not electrically connected in OPA191IDGKR).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Output | Amplifier output node; capable of ±65 mA sourcing/sinking and rail-to-rail swing within 15 mV of rails (no load). |
| 2 - –IN | Inverting Input | Differential input terminal; accepts common-mode voltages from (V–) – 0.1 V to (V+) + 0.1 V. |
| 3 - +IN | Noninverting Input | Differential input terminal; matched to –IN for CMRR >140 dB and low input bias current (±5 pA). |
| 4 - V– | Negative Supply | Lowest potential supply rail; must be decoupled locally to minimize PSRR degradation. |
| 5 - NC | No Connection | Internally unconnected; may be left floating or tied to ground for mechanical stability (no electrical function). |
| 6 - OUT | Output | Redundant pin designation-same node as Pin 1; not used in single-channel OPA191IDGKR. |
| 7 - V+ | Positive Supply | Highest potential supply rail; supports up to ±18 V; EMI/RFI filtering integrated on input pins reduces sensitivity. |
| 8 - NC | No Connection | Internally unconnected; no electrical function; standard VSSOP-8 pinout includes two NCs for family compatibility. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input/output | Enables full dynamic range utilization in single-supply 3.3-V or 5-V systems and preserves headroom in ±15-V industrial rails. |
| e-trim™ precision architecture | Delivers factory-trimmed ±5 µV offset and ±0.1 µV/°C drift-reducing or eliminating system-level calibration overhead. |
| EMI/RFI filtered inputs | Integrated input filtering suppresses 100-MHz–2-GHz interference, improving immunity in noisy motor-control or PLC environments. |
| Differential input voltage range to supply rail | Allows overvoltage tolerance up to (V+) – (V–) + 0.2 V, supporting fault-tolerant sensor interface designs without external clamping. |
| 1-nF capacitive load drive | Stable operation into heavy capacitive loads enables direct connection to ADC input capacitors or long cables without phase-margin loss. |
| High output current (±65 mA) | Drives low-impedance loads (e.g., 150-Ω transmission lines, relay coils) without external buffers in compact analog output modules. |
Applications
| Pressure Transmitter Signal Conditioning | High-Voltage Multiplexed DAQ Front-End |
|---|---|
Use Scenario: Amplifying low-level mV outputs from strain-gauge bridges in 24-V loop-powered transmitters. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with rail-to-rail input enabling full bridge swing capture and low-drift gain staging. Use Value: ±5 µV offset and ±0.1 µV/°C drift ensure ≤0.05%FS error over temperature without calibration-meeting SIL-2 functional safety requirements. |
Use Scenario: Buffering and level-shifting sensor signals in 36-V industrial DAQ systems with HV MUX and anti-aliasing filters. IC Role / Device Role / Timing Role: High-voltage, low-noise buffer between multiplexer output and ADC driver stage; handles differential input voltage up to supply rail. Use Value: 1-nF capacitive load drive and 5 V/µs slew rate enable direct interface to 1-MSPS SAR ADCs with <0.1% settling error in <1 µs. |
| Source Measurement Unit (SMU) Voltage Source | Train Control Analog Input Module |
Use Scenario: Precision voltage source in benchtop SMUs requiring sub-µV noise and ppm-level linearity over 0–20 V range. IC Role / Device Role / Timing Role: Output buffer and feedback amplifier in four-quadrant voltage/current source topology with Kelvin sensing. Use Value: 15 nV/√Hz input voltage noise at 1 kHz and 140 dB CMRR suppress measurement artifacts from shared ground paths and supply ripple. |
Use Scenario: Isolated analog input for train brake control sensors operating in harsh EMI environments (EN 50121-3-2 compliant). IC Role / Device Role / Timing Role: EMI-hardened signal conditioner for thermocouple, RTD, and current-loop inputs in rolling stock I/O modules. Use Value: ±3000-V HBM ESD rating and integrated RFI filtering ensure reliable operation during lightning-induced transients on rail-mounted equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA189IDBVR | Lower input voltage noise (4.2 nV/√Hz), higher quiescent current (1.3 mA), same VSSOP-5 package footprint but only 5-pin SOT-23 variant available. | Better suited for low-noise, wideband applications (e.g., photodiode TIA); less optimal for ultra-low-power or rail-to-rail input-critical designs. | Select OPA189IDBVR only when noise dominates over power and offset specs; OPA191IDGKR remains superior for DC precision and supply flexibility. |
| ADA4522-1ARMZ | Zero-drift architecture, lower offset drift (±0.005 µV/°C), higher supply current (440 µA), SOIC-8 only-no VSSOP-8 option. | Ideal for zero-drift-critical applications like weigh scales; lacks 1-nF capacitive load drive and EMI filtering of OPA191IDGKR. | Choose ADA4522-1ARMZ for sub-ppm drift over extended temperature ranges; OPA191IDGKR preferred where EMI immunity and capacitive drive are mandatory. |
Compared with OPA189IDBVR and ADA4522-1ARMZ, the OPA191IDGKR uniquely balances ultra-low offset drift, EMI-hardened inputs, and robust 1-nF load drive in a space-constrained VSSOP-8 package-making it optimal for industrial signal chains where reliability, size, and mixed-signal integrity coexist.
Availability
OPA191IDGKR is available at Aetrix Electronics and suitable for pressure transmitter design, high-voltage multiplexed data acquisition, and train control analog input modules requiring stable component supply across extended temperature (–40°C to +125°C) and long production lifecycles.
Supply support for OPA191IDGKR 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 precision amplifiers and industrial-grade signal chain solutions.
The OPAx191 family was designed specifically for high-voltage, high-precision industrial applications-including analog input modules, source measurement units, and harsh-environment sensor interfaces-where DC accuracy, AC performance, and reliability must coexist.
FAQ
What is the maximum capacitive load the OPA191IDGKR can drive stably?
The OPA191IDGKR is characterized to drive up to 1 nF capacitively without requiring external isolation resistors or compensation. This capability is verified across temperature (–40°C to +125°C) and supply conditions (±2.25 V to ±18 V), making it suitable for direct interfacing with SAR ADC inputs and long PCB traces in industrial DAQ systems. The OPA191IDGKR maintains phase margin >45° under these conditions per TI SBOS701D test data.
Does the OPA191IDGKR support true rail-to-rail input operation across its full common-mode range?
Yes-the OPA191IDGKR supports rail-to-rail input with a common-mode voltage range from (V–) – 0.1 V to (V+) + 0.1 V. This includes operation at the negative rail (V–) and extends 0.1 V beyond the positive rail (V+), enabling accurate sensing of signals near supply boundaries in both single- and dual-supply configurations. This specification is confirmed in Section 6.7 of the OPA191IDGKR datasheet (SBOS701D).
What is the typical input offset voltage drift of the OPA191IDGKR over temperature?
The OPA191IDGKR exhibits a typical input offset voltage drift of ±0.1 µV/°C over 0°C to 85°C, and ±0.15 µV/°C over the full –40°C to +125°C range. These values apply specifically to the DGK (VSSOP-8) package and are measured under VS = ±18 V. This ultra-low drift ensures minimal calibration burden in unattended field instruments-e.g., a 100°C span introduces only ±15 µV max drift.
Is the OPA191IDGKR pin-compatible with other members of the OPAx191 family?
No-OPA191IDGKR (single, VSSOP-8) is not pin-compatible with OPA2191 (dual) or OPA4191 (quad) variants, even in the same VSSOP-8 package. Pin functions differ: OPA191IDGKR uses Pins 1/6 as OUT (redundant), while OPA2191 maps distinct channels to Pins 1/7 (OUT A/B). Always verify pin mapping per device-specific Figure 5-2 (OPA191) and Figure 5-3 (OPA2191) in SBOS701D before board reuse.
What thermal metrics apply to the OPA191IDGKR in VSSOP-8 (DGK) package?
For the OPA191IDGKR in DGK (VSSOP-8), junction-to-ambient thermal resistance (RθJA) is 180.4°C/W, junction-to-board (RθJB) is 102.1°C/W, and junction-to-case (top) is 67.9°C/W. These values assume JEDEC-standard PCB layout (2-layer, 2-oz copper, 1-in² copper area). Derating is required above +125°C ambient; internal thermal shutdown activates at +180°C junction temperature.
OPA191IDGKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-VSSOP
OPA191IDGKR FAQ
1.How can I place an order for OPA191IDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA191IDGKR 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 OPA191IDGKR reliable?
The price and inventory of OPA191IDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA191IDGKR is usually 5 days.
3.What payment methods are accepted for OPA191IDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA191IDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA191IDGKR?
OPA191IDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA191IDGKR 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 OPA191IDGKR?
For technical support, including OPA191IDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA191IDGKR requirements.
6.How does Aetrix verify that OPA191IDGKR is sourced from the original manufacturer or authorized distributors?
All OPA191IDGKR 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 OPA191IDGKR meets industry standards.
7.What is the process for return or replacement of OPA191IDGKR?
All OPA191IDGKR units undergo pre-shipment inspection (PSI). If there is an issue with OPA191IDGKR, 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 OPA191IDGKR part is unused and in its original packaging.
Return procedure for OPA191IDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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