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Texas Instruments OPA191IDR
- Part No.:
- OPA191IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA191IDR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,306
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Product details
Overview
OPA191IDR 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 (or 4.5 V to 36 V single supply) and delivers high DC accuracy and low noise (15 nV/√Hz at 1 kHz) for sensor signal conditioning in industrial data acquisition systems.
For engineers reviewing the OPA191IDR datasheet, OPA191IDR pinout, OPA191IDR application, or OPA191IDR equivalent, key selection considerations include its ultra-low input bias current for high-impedance source interfacing, differential input voltage range extending to the rails, 1-nF capacitive load drive capability, and operation across –40°C to +125°C for harsh-environment instrumentation.
Technical Context
The OPA191IDR employs e-trim™ technology for outstanding DC precision, achieving ±5 µV typical input offset voltage and ±0.1 µV/°C drift. Its CMOS input stage enables ±5 pA bias current and >10¹³ Ω common-mode input impedance, critical for photodiode and bridge sensor front-ends.
This device features a robust output stage capable of ±65 mA drive, rail-to-rail swing within 5 mV of supply rails under no load, and stable operation into 1-nF loads-enabling direct driving of ADC input filters and multiplexer outputs without external isolation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±2.25 V to ±18 V (or 4.5 V to 36 V single supply): supports wide industrial power rails including 24-V systems and battery-powered portable instruments. |
| Input Offset Voltage | ±5 µV (typ): enables sub-16-bit error budget in 24-bit precision DAQ channels without calibration. |
| Input Bias Current | ±5 pA (typ): preserves signal integrity when amplifying high-impedance sources like piezoresistive pressure sensors or thermocouples. |
| Gain-Bandwidth Product | 2.5 MHz: sufficient for anti-aliasing filtering and closed-loop gain stages up to ~100 kHz at unity-gain stability. |
| Slew Rate | 5 V/µs: supports fast settling (<1 µs to 0.01%) for multiplexed multi-channel acquisition with minimal channel crosstalk. |
| Capacitive Load Drive | 1 nF: allows direct connection to ADC input RC filters or long PCB traces without phase-margin degradation or oscillation. |
| Operating Temperature | –40°C to +125°C: qualified for use in train control electronics, motor drives, and field-deployed process transmitters. |
Pinout & Package
OPA191IDR is packaged in an 8-pin SOIC (D) package measuring 4.90 mm × 3.90 mm, with industry-standard pinout compatible with legacy precision op amps.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection; must be left floating or grounded per layout best practice-no functional impact. |
| 2 | –IN | Inverting input terminal; accepts differential signals and supports active filter configurations with precise feedback control. |
| 3 | +IN | Noninverting input terminal; high-impedance CMOS node enabling direct connection to high-Z sensors without loading. |
| 4 | V– | Negative supply rail connection; referenced to system ground in single-supply configurations (e.g., 0 V for 4.5–36 V operation). |
| 5 | NC | No internal connection; electrically isolated-no routing or termination required. |
| 6 | OUT | Amplifier output; capable of ±65 mA drive and rail-to-rail swing, suitable for driving ADC inputs or analog multiplexers directly. |
| 7 | V+ | Positive supply rail connection; accepts up to +36 V, enabling direct interface with 24-V industrial bus voltages. |
| 8 | NC | No internal connection; unused pad-may be tied to ground for thermal or EMI mitigation if needed. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full dynamic range utilization in low-voltage and high-voltage supplies-supports 0 V to 36 V input common-mode and output swing within 5 mV of rails. |
| Differential input voltage range to supply rail | Allows overvoltage tolerance up to (V+) – (V–) + 0.2 V, protecting against transient surges in industrial I/O modules. |
| EMI/RFI filtered inputs | Integrated input filtering suppresses high-frequency interference from motor drives or wireless comms, reducing need for external ferrites. |
| Low quiescent current (140 µA) | Permits use in always-on sensor nodes and battery-backed systems where power budget is constrained to <200 µA per channel. |
| High capacitive load drive (1 nF) | Eliminates need for output isolation resistors when driving ADC sampling capacitors or long cables, simplifying BOM and layout. |
Applications
| Pressure Transmitter | Data Acquisition (DAQ) |
|---|---|
Use Scenario: Amplifies millivolt-level output from silicon piezoresistive pressure sensors in HVAC and process control systems. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with programmable gain and offset correction. Use Value: ±5 µV offset and ±5 pA bias current minimize zero-drift and source loading, enabling <0.1% FS accuracy over temperature. |
Use Scenario: Signal conditioning stage in modular analog input cards handling multiple sensor types (thermocouple, RTD, strain gauge). IC Role / Device Role / Timing Role: Low-noise, rail-to-rail buffer and anti-aliasing filter driver preceding SAR ADCs. Use Value: 15 nV/√Hz noise and 2.5-MHz bandwidth support 18-bit+ effective resolution at 100 kSPS sampling rates. |
| Mixed I/O Module (AI/AO/DI/DO) | Source Measurement Unit (SMU) |
Use Scenario: High-impedance voltage sensing and low-distortion output buffering in programmable logic controller (PLC) analog modules. IC Role / Device Role / Timing Role: Dual-role signal conditioner: input buffer for AI channels and output driver for AO channels. Use Value: Single-supply operation (4.5–36 V) and rail-to-rail I/O simplify power architecture across mixed-signal functions on one board. |
Use Scenario: Precision current sourcing and voltage measurement in semiconductor test equipment requiring sub-picoamp compliance. IC Role / Device Role / Timing Role: Feedback amplifier in transimpedance and voltage-controlled current source topologies. Use Value: ±5 pA input bias current ensures <10 fA measurement floor in picoammeter circuits without guard-driven compensation. |
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 offset drift (±0.005 µV/°C vs ±0.1 µV/°C), higher GBW (12 MHz), but higher IQ (1.3 mA) and narrower supply (±2.25 V to ±18 V only). | Better for ultra-stable DC measurements over wide temperature ranges; less suitable for low-power or high-capacitive-load applications. | Select OPA189IDBVR when long-term drift dominates error budget and power is not constrained. |
| ADA4522-1ARZ | Zero-drift architecture (chopper-stabilized), lower offset (±0.3 µV), but limited bandwidth (3 MHz), higher noise at 1 kHz (21 nV/√Hz), and no rail-to-rail output. | Preferred for microvolt-level DC offsets in medical instrumentation; unsuitable for rail-to-rail output or high-speed settling. | Select ADA4522-1ARZ when absolute offset minimization is critical and AC performance is secondary. |
Compared with OPA191IDR, OPA189IDBVR trades ultra-low drift for higher speed and power, while ADA4522-1ARZ achieves lower offset via chopper topology at the cost of increased 1/f noise and output voltage headroom limitations-making OPA191IDR the balanced choice for industrial DAQ requiring precision, drive strength, and efficiency.
Availability
OPA191IDR is available at Aetrix Electronics and suitable for pressure transmitter design, industrial data acquisition systems, mixed-signal I/O modules, and source measurement units requiring stable component supply across extended temperature and voltage ranges.
Supply support for OPA191IDR 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 high-precision signal chain solutions.
The OPAx191 family was designed for high-voltage industrial applications demanding both DC precision and robust AC performance-including sensor signal conditioning, programmable logic controllers, and automated test equipment.
FAQ
What is the maximum supply voltage for OPA191IDR?
The OPA191IDR supports a maximum supply voltage of ±20 V (dual supply) or +40 V (single supply), with recommended operating range up to ±18 V (or 36 V total). Absolute maximum ratings must not be exceeded to avoid permanent damage; sustained operation above ±18 V is not specified for performance or reliability.
Does OPA191IDR support rail-to-rail input and output simultaneously?
Yes, OPA191IDR supports true rail-to-rail input and output operation: common-mode input range extends from (V–) – 0.1 V to (V+) + 0.1 V, and output swings within 5 mV of either rail under no load. This enables full-scale signal handling in both single- and dual-supply configurations without clipping.
Can OPA191IDR drive a 1-nF capacitive load stably?
Yes, OPA191IDR is explicitly characterized for stable operation into 1-nF capacitive loads, as confirmed in the datasheet's Typical Characteristics section (Figure 6-32/6-33). No external isolation resistor is required, simplifying design of anti-aliasing filters and ADC interface networks.
What is the input bias current specification for OPA191IDR at 125°C?
At TA = –40°C to +125°C, the input bias current for OPA191IDR is specified as ±9 nA (max), increasing from the ±5 pA (typ) value at +25°C due to CMOS gate leakage. This remains exceptionally low compared to bipolar-input op amps, preserving accuracy in high-impedance sensor interfaces.
Is OPA191IDR pin-compatible with other devices in the OPAx191 family?
No-OPA191IDR (single-channel, SOIC-8) shares package footprint with OPA2191 (dual) and OPA4191 (quad) in SOIC-8, but pin functions differ significantly. For example, pins 1 and 5 are NC in OPA191IDR but active inputs/outputs in multi-channel variants. Direct substitution requires schematic and layout revision.
OPA191IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
OPA191IDR FAQ
1.How can I place an order for OPA191IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA191IDR 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 OPA191IDR reliable?
The price and inventory of OPA191IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA191IDR is usually 5 days.
3.What payment methods are accepted for OPA191IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA191IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA191IDR?
OPA191IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA191IDR 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 OPA191IDR?
For technical support, including OPA191IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA191IDR requirements.
6.How does Aetrix verify that OPA191IDR is sourced from the original manufacturer or authorized distributors?
All OPA191IDR 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 OPA191IDR meets industry standards.
7.What is the process for return or replacement of OPA191IDR?
All OPA191IDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA191IDR, 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 OPA191IDR part is unused and in its original packaging.
Return procedure for OPA191IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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