My Inquiry
My Account
Texas Instruments OPA2191IDGKT
- Part No.:
- OPA2191IDGKT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA2191IDGKT.pdf
- Description:
- IC CMOS 2 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:381
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
OPA2191IDGKT from Texas Instruments is a dual-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 is optimized for high-accuracy signal conditioning in industrial data acquisition and sensor front-ends.
For engineers reviewing the OPA2191IDGKT datasheet, OPA2191IDGKT pinout, OPA2191IDGKT application, or OPA2191IDGKT equivalent, key selection criteria include ultra-low input bias current (±5 pA), low 15 nV/√Hz noise at 1 kHz, EMI/RFI-filtered inputs, and robust 1 nF capacitive load drive-critical for stable high-voltage analog measurement systems.
Technical Context
The OPA2191IDGKT implements a precision e-trim™ architecture enabling exceptional DC accuracy without external calibration. Its differential input voltage range extends to the supply rails, supporting wide common-mode operation up to (V+) + 0.1 V and (V–) – 0.1 V.
It features a high slew rate of 5 V/µs (rising) and 7.5 V/µs (falling), fast overload recovery (<1 µs), and 150 dB channel-to-channel crosstalk at DC-enabling accurate dual-channel simultaneous sampling in multiplexed DAQ systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±2.25 V to ±18 V (4.5 V to 36 V): supports single- or dual-supply industrial systems including 24-V PLC I/O and isolated sensor interfaces. |
| Input Offset Voltage | ±5 µV (typ): enables sub-0.01% error in 16-bit+ precision measurement without trimming. |
| Offset Drift | ±0.1 µV/°C (typ): ensures <1 µV total drift over 0°C–85°C ambient, critical for uncalibrated field instrumentation. |
| Gain-Bandwidth Product | 2.5 MHz: allows stable closed-loop gain ≥10 at 200 kHz for anti-aliasing filter buffering and fast sensor signal conditioning. |
| Input Bias Current | ±5 pA (typ): preserves integrity of high-impedance sources like piezoresistive bridges and pH electrodes. |
| Capacitive Load Drive | 1 nF: eliminates need for isolation resistors when driving ADC input filters or long PCB traces. |
| Common-Mode Rejection | 140 dB (typ): rejects >100 µV of common-mode interference on 10-V signals, essential in noisy factory environments. |
Pinout & Package
VSSOP-8 (DGK) package: 3.00 mm × 3.00 mm body, 0.65 mm pitch, exposed pad optional; thermally enhanced for continuous operation at +125°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT A | Output, Channel A | Delivers rail-to-rail swing with ±65 mA drive capability; connects directly to ADC driver or precision DAC buffer stage. |
| 2 - –IN A | Inverting Input, Channel A | High-impedance node (10¹³ Ω || 6.4 pF); accepts feedback networks for transimpedance or difference amplification. |
| 3 - +IN A | Noninverting Input, Channel A | EMI/RFI-filtered input; supports direct connection to bridge sensors or thermocouples without external RC filtering. |
| 4 - V– | Negative Supply Rail | Reference for dual-supply operation; must be decoupled with 0.1 µF ceramic capacitor near pin. |
| 5 - +IN B | Noninverting Input, Channel B | Independent high-Z input for second sensor channel; shares no internal coupling with Channel A beyond specified 150 dB crosstalk. |
| 6 - –IN B | Inverting Input, Channel B | Matches Channel A electrical characteristics; enables matched dual-channel instrumentation amplifier configurations. |
| 7 - OUT B | Output, Channel B | Full rail-to-rail swing with identical AC performance to OUT A; supports independent output loading up to 1 nF. |
| 8 - V+ | Positive Supply Rail | Accepts up to +18 V; supplies both channels; requires local 0.1 µF + 2.2 µF decoupling per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input/output | Enables full dynamic range utilization with 3.3-V, 5-V, or 24-V supplies-no headroom loss at signal extremes. |
| Differential input voltage range to supply rail | Allows input signals exceeding V+ or falling below V– by up to 0.1 V, simplifying level-shifting in HV multiplexed DAQ. |
| EMI/RFI filtered inputs | Integrated RF rejection eliminates external ferrite beads or RC filters in industrial EMC-compliant designs. |
| Low quiescent current (140 µA per amp) | Supports always-on sensor monitoring in battery-backed or energy-harvesting systems without compromising precision. |
| High capacitive load drive (1 nF) | Stabilizes output into ADC input capacitance, anti-aliasing filters, or long cables-no external series resistor needed. |
Applications
| Analog Input Module | Mixed Module (AI, AO, DI, DO) |
|---|---|
Use Scenario: 16-channel, 24-bit isolated analog input module for programmable logic controllers handling 4–20 mA, ±10 V, and thermocouple inputs. IC Role / Device Role / Timing Role: Precision signal conditioning amplifier for each channel-buffering, level-shifting, and driving anti-aliasing filters before sigma-delta ADC. Use Value: ±5 µV offset and ±0.1 µV/°C drift ensure <0.005% total unadjusted error across temperature, eliminating per-channel calibration. | Use Scenario: Modular I/O base with integrated AI, AO, DI, and DO on single backplane; requires compact, low-power, high-accuracy analog front-end. IC Role / Device Role / Timing Role: Dual-channel op amp providing simultaneous buffered outputs for two independent analog outputs (AO) while rejecting shared supply noise. Use Value: 150 dB crosstalk and 140 dB CMRR prevent channel-to-channel interference and maintain 16-bit linearity in mixed-signal modules. |
| Data Acquisition (DAQ) | Source Measurement Unit (SMU) |
Use Scenario: Portable handheld DAQ with 8-channel simultaneous sampling, 100 kS/s, and 100 dB SNR targeting lab and field use. IC Role / Device Role / Timing Role: Front-end amplifier for multiplexed high-voltage sensor inputs (e.g., pressure transducers, strain gauges) with rail-to-rail output swing. Use Value: 2.5-MHz GBW and 5 V/µs slew rate support 100-kHz small-signal bandwidth and fast settling (<1 µs to 0.01%) for high-throughput sampling. | Use Scenario: Benchtop SMU requiring pA-level sourcing/sinking accuracy, low noise, and fast transient response for semiconductor device characterization. IC Role / Device Role / Timing Role: Transimpedance amplifier for feedback path in precision current source/sink; also used in voltage sense loop for compliance control. Use Value: ±5 pA input bias current minimizes error in pA-range measurements; 15 nV/√Hz noise preserves resolution down to 100 nV RMS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2189IDGKT | Lower offset drift (±0.005 µV/°C), higher GBW (12 MHz), but higher IQ (560 µA) and no EMI filtering. | Better for ultra-stable DC-critical applications (e.g., metrology standards); less suitable for noisy industrial environments. | Select OPA2189IDGKT only if drift dominates error budget and EMI immunity is not required. |
| AD8638ARZ-REEL7 | Similar offset (±5 µV) and drift (±0.1 µV/°C), but lower supply range (±16.5 V max), no rail-to-rail output, and no 1 nF load drive spec. | Limited to ≤33-V total supply; cannot drive heavy capacitive loads without external compensation. | Choose AD8638ARZ-REEL7 only for cost-sensitive, non-HV, low-capacitance applications where rail-to-rail output is unnecessary. |
Compared with OPA2189IDGKT and AD8638ARZ-REEL7, the OPA2191IDGKT uniquely combines EMI filtering, 1-nF capacitive load drive, and rail-to-rail output within a 140-µA quiescent current envelope-making it optimal for ruggedized, high-voltage industrial signal chains where reliability and layout simplicity are prioritized over marginal drift improvement.
Availability
OPA2191IDGKT is available at Aetrix Electronics and suitable for analog input modules, mixed I/O modules, data acquisition systems, and source measurement units requiring stable component supply across extended temperature ranges (–40°C to +125°C) and long production lifecycles.
Supply support for OPA2191IDGKT 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 and embedded processing solutions for industrial, automotive, and personal electronics markets.
The OPAx191 family was designed specifically for high-precision, high-voltage industrial signal conditioning-emphasizing low drift, EMI resilience, and robust capacitive load drive in harsh electromagnetic environments.
FAQ
What is the maximum supply voltage for OPA2191IDGKT?
The OPA2191IDGKT supports a maximum supply voltage of ±20 V (or +40 V single supply), with recommended operation up to ±18 V (36 V total). Absolute maximum ratings define safe stress limits, but functional specifications-including offset voltage, bandwidth, and output swing-are guaranteed only within the recommended operating conditions of ±2.25 V to ±18 V (4.5 V to 36 V).
Does OPA2191IDGKT support rail-to-rail input and output simultaneously?
Yes, the OPA2191IDGKT provides true rail-to-rail input and output operation: its input common-mode range extends from (V–) – 0.1 V to (V+) + 0.1 V, and its output swings within 15 mV of each rail under no-load conditions. This enables full utilization of supply rails in both single- and dual-supply configurations-critical for maximizing dynamic range in precision measurement circuits using the OPA2191IDGKT.
What is the thermal performance of OPA2191IDGKT in VSSOP-8 package?
The OPA2191IDGKT in DGK (VSSOP-8) package has a junction-to-ambient thermal resistance (RθJA) of 158 °C/W and junction-to-board resistance (RθJB) of 102.1 °C/W. At 140 µA per amplifier (280 µA total), self-heating remains minimal-less than 4°C rise above ambient at +125°C ambient-ensuring stable offset and drift performance in sealed industrial enclosures where the OPA2191IDGKT is deployed.
Can OPA2191IDGKT drive a 1-nF capacitive load without oscillation?
Yes, the OPA2191IDGKT is explicitly characterized and specified to drive up to 1 nF capacitive load stably, as confirmed in the datasheet's "Capacitive Load and Stability" section and Figure 6-32/6-33. This eliminates the need for external series isolation resistors when interfacing with ADC input capacitance, anti-aliasing filters, or long PCB traces-simplifying layout and preserving signal integrity in systems using the OPA2191IDGKT.
Is OPA2191IDGKT suitable for high-EMI industrial environments?
Yes, the OPA2191IDGKT integrates EMI/RFI filtered inputs-a feature explicitly called out in its datasheet features list. This internal filtering suppresses high-frequency interference (e.g., from variable frequency drives or switching power supplies) without requiring external components, making the OPA2191IDGKT particularly well-suited for factory-floor instrumentation, motor control feedback, and other electrically noisy applications where signal integrity is paramount.
OPA2191IDGKT 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:
- CMOS
- Number of Circuits:
- 2
- 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 (x2 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:
- 8-VSSOP
OPA2191IDGKT FAQ
1.How can I place an order for OPA2191IDGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2191IDGKT 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 OPA2191IDGKT reliable?
The price and inventory of OPA2191IDGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2191IDGKT is usually 5 days.
3.What payment methods are accepted for OPA2191IDGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2191IDGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2191IDGKT?
OPA2191IDGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2191IDGKT 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 OPA2191IDGKT?
For technical support, including OPA2191IDGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2191IDGKT requirements.
6.How does Aetrix verify that OPA2191IDGKT is sourced from the original manufacturer or authorized distributors?
All OPA2191IDGKT 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 OPA2191IDGKT meets industry standards.
7.What is the process for return or replacement of OPA2191IDGKT?
All OPA2191IDGKT units undergo pre-shipment inspection (PSI). If there is an issue with OPA2191IDGKT, 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 OPA2191IDGKT part is unused and in its original packaging.
Return procedure for OPA2191IDGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA2191IDGKT 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…
