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Texas Instruments OPA2171AIDGK
- Part No.:
- OPA2171AIDGK
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA2171AIDGK.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:9,608
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Product details
Overview
OPA2171AIDGK from Texas Instruments is a dual-channel, rail-to-rail output, general-purpose operational amplifier in an 8-pin VSSOP package (DGK), operating from 2.7V to 36V single supply or ±1.35V to ±18V dual supply. It delivers 3MHz gain bandwidth, 14nV/√Hz input voltage noise, ±0.3µV/°C typical offset drift, 475µA per amplifier quiescent current, and rail-to-rail output swing - enabling precision signal conditioning in space-constrained industrial sensor interfaces.
For engineers reviewing the OPA2171AIDGK datasheet, OPA2171AIDGK pinout, OPA2171AIDGK application, or OPA2171AIDGK equivalent, key selection criteria include its wide supply range, low drift over –40°C to +125°C, RFI-filtered inputs, full rail-to-rail input capability beyond the positive rail, and stable operation with up to 300pF capacitive loads - critical for transducer amplification and battery-powered instrumentation.
Technical Context
The OPA2171AIDGK implements a proprietary input stage that supports common-mode voltage operation from 100mV below V– to within 2V of V+, with extended rail-to-rail input (up to 100mV beyond V+) at reduced performance. Its internal phase-reversal protection prevents output inversion when inputs exceed common-mode limits - a key differentiator versus standard op-amps.
It features high open-loop gain (130dB typ), 120dB typical CMRR at ±18V, and low-input bias current (8pA typ), making it suitable for high-impedance source interfacing. The device is unity-gain stable and specified across the full industrial temperature range without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 2.7V to 36V single supply - enables direct interface with 3.3V, 5V, 12V, and 24V industrial rails without level-shifting |
| Gain Bandwidth | 3MHz - supports stable closed-loop operation up to ~200kHz at G = 10 for sensor signal amplification |
| Input Voltage Noise | 14nV/√Hz at 1kHz - preserves SNR in low-level transducer and strain gauge front-ends |
| Offset Drift | ±0.3µV/°C typical - ensures <1.5µV total drift over –40°C to +125°C, critical for uncalibrated temperature measurement |
| Quiescent Current | 475µA per amplifier - allows dual-channel precision amplification in battery-powered instruments with multi-year runtime |
| Output Swing | Rail-to-rail - delivers full dynamic range into 10kΩ load, minimizing headroom loss in single-supply data acquisition systems |
| CMRR | 120dB typical at ±18V - rejects power supply ripple and common-mode interference in noisy industrial environments |
Pinout & Package
OPA2171AIDGK uses the DGK package: 8-pin Very Thin Shrink Small Outline Package (VSSOP), 3.0mm × 4.9mm body, 0.65mm pitch, exposed thermal pad (not electrically connected). Pin 1 is marked by a dot; pin numbering follows standard VSSOP convention (counterclockwise from mark).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN A (Pin 3) | Noninverting input | Accepts high-impedance sensor signals (e.g., thermocouple, bridge) with 8pA bias current |
| –IN A (Pin 2) | Inverting input | Configures A amplifier as inverting gain stage or transimpedance amplifier |
| OUT A (Pin 1) | Output | Drives 10kΩ load rail-to-rail; stable with ≤300pF capacitive load |
| V– (Pin 4) | Negative supply | Reference for dual-supply operation or ground in single-supply systems |
| +IN B (Pin 5) | Noninverting input | Independent channel for differential pair amplification or reference buffering |
| –IN B (Pin 6) | Inverting input | Enables dual-channel instrumentation amplifier topology with matched components |
| OUT B (Pin 7) | Output | Second independent output; no crosstalk degradation up to 100kHz (120dB channel separation) |
| V+ (Pin 8) | Positive supply | Supports up to 36V - eliminates need for external regulators in 24V PLC I/O modules |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Delivers full supply-voltage swing into 10kΩ, maximizing ADC input range in single-supply DAQ systems |
| RFI-filtered inputs | Integrated input filtering suppresses high-frequency EMI from motor drives and switching power supplies |
| Phase-reversal protection | Prevents output inversion during overvoltage transients - eliminates latch-up risk in unbuffered sensor interfaces |
| Wide common-mode range | Operates with inputs 100mV below V– and up to V+ + 0.1V - simplifies level-shifting in mixed-voltage systems |
| Low quiescent current | 475µA per channel enables always-on precision sensing in energy-harvesting and portable test equipment |
Applications
| Transducer Amplification | Bridge Sensor Conditioning |
|---|---|
Use Scenario: Amplifying low-level mV outputs from pressure, load cell, or humidity transducers in industrial process controllers. IC Role / Device Role / Timing Role: Dual-channel OPA2171AIDGK configures one amplifier as precision noninverting gain stage and the other as reference buffer for ratiometric ADC conversion. Use Value: 0.3µV/°C drift and 14nV/√Hz noise ensure <0.1% full-scale error over temperature without calibration. | Use Scenario: Signal conditioning for Wheatstone bridge sensors (e.g., strain gauges, torque sensors) in structural health monitoring systems. IC Role / Device Role / Timing Role: OPA2171AIDGK provides matched dual-channel amplification with >120dB CMRR to reject bridge excitation noise and supply ripple. Use Value: Rail-to-rail output drives 16-bit SAR ADC directly, eliminating external level-shifting and preserving dynamic range. |
| Battery-Powered Instrumentation | Precision Integrators |
Use Scenario: Portable multimeters, handheld calibrators, and field-deployable environmental sensors requiring multi-year battery life. IC Role / Device Role / Timing Role: OPA2171AIDGK serves as front-end amplifier and active filter stage, leveraging ultra-low 475µA/channel quiescent current. Use Value: Enables dual-channel analog signal path with <1mA total supply current - extends CR2032 battery life beyond 5 years. | Use Scenario: Analog integrators in PID controllers, charge amplifiers for piezoelectric sensors, and zero-drift baseline restoration circuits. IC Role / Device Role / Timing Role: OPA2171AIDGK's 8pA input bias current minimizes integration error drift; low 14nV/√Hz noise maintains signal fidelity. Use Value: Achieves <10nV/s integration drift rate over 8 hours - sufficient for high-accuracy motion control feedback loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2182AIDGKT | Lower offset drift (±0.012µV/°C), higher precision, but 650µA IQ and 5.7MHz GBW | Targeted at metrology-grade systems where drift dominates error budget; less suitable for low-power designs | Select OPA2182AIDGKT only when sub-µV total drift is mandatory and power is secondary |
| LMV722MMX/NOPB | Lower supply range (2.7V–5.5V), 10MHz GBW, but higher noise (20nV/√Hz) and no phase-reversal protection | Optimized for 3.3V portable audio and consumer electronics - lacks industrial temp range and robustness | Choose LMV722MMX/NOPB for cost-sensitive, low-voltage consumer apps where 125°C operation is unnecessary |
Compared with OPA2171AIDGK, OPA2182AIDGKT trades higher power for metrology-grade stability, while LMV722MMX/NOPB sacrifices industrial temperature range and phase-reversal immunity for consumer-grade speed and cost - making OPA2171AIDGK the balanced choice for rugged, wide-supply, low-drift industrial signal chains.
Availability
OPA2171AIDGK is available at Aetrix Electronics and suitable for transducer amplification, bridge sensor conditioning, and battery-powered instrumentation requiring stable component supply across extended temperature and voltage ranges.
Supply support for OPA2171AIDGK 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 OPAx171 family was designed for general-purpose precision amplification in harsh environments - emphasizing wide supply range, low drift, phase-reversal immunity, and robust capacitive-load drive for industrial sensor signal chains.
FAQ
What is the maximum capacitive load the OPA2171AIDGK can drive without instability?
The OPA2171AIDGK is specified stable with capacitive loads up to 300pF when driving a 10kΩ load. For heavier loads, TI recommends adding a series isolation resistor (e.g., 50Ω) between the output and capacitance. This configuration maintains phase margin and prevents peaking or oscillation in applications like cable-driven outputs or anti-aliasing filters. Always verify stability under actual board parasitics using small-signal step response testing.
Does the OPA2171AIDGK support true rail-to-rail input operation?
Yes - the OPA2171AIDGK supports full rail-to-rail input operation, accepting common-mode voltages from 100mV below V– to 100mV beyond V+. Within 2V of V+, performance degrades (e.g., increased offset, reduced CMRR), but operation remains functional. This capability eliminates external level-shifters in single-supply systems interfacing with grounded sensors or DACs.
What is the guaranteed operating temperature range for the OPA2171AIDGK?
The OPA2171AIDGK is fully specified and guaranteed over –40°C to +125°C ambient temperature. All key parameters - including offset drift (±0.3µV/°C typ), CMRR (120dB typ at ±18V), and quiescent current (≤650µA per amplifier) - are tested and warranted across this full industrial range, making it suitable for under-hood automotive modules and factory-floor PLCs.
How does the phase-reversal protection in the OPA2171AIDGK improve system reliability?
The OPA2171AIDGK's internal phase-reversal protection prevents output inversion when input signals exceed the linear common-mode range - a failure mode common in unprotected op-amps during power-up sequencing or transient overvoltage events. Instead of latching to the opposite rail, the output safely limits to the appropriate supply rail, avoiding downstream logic faults or ADC saturation in safety-critical sensor interfaces.
Can the OPA2171AIDGK be used in single-supply 3.3V systems?
Yes - the OPA2171AIDGK operates down to 2.7V single supply, making it fully compatible with 3.3V systems. At 3.3V, it maintains rail-to-rail output swing (within 30mV of rails), 3MHz GBW, and 14nV/√Hz noise. Its input common-mode range extends from –0.1V to 3.4V, allowing direct interface with 3.3V DACs and grounded sensors without external biasing networks.
OPA2171AIDGK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1.5V/µs
- Gain Bandwidth Product:
- 3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 8 pA
- Voltage - Input Offset:
- 250 µV
- Current - Supply:
- 475µA (x2 Channels)
- Current - Output / Channel:
- 35 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
OPA2171AIDGK FAQ
1.How can I place an order for OPA2171AIDGK through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2171AIDGK 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 OPA2171AIDGK reliable?
The price and inventory of OPA2171AIDGK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2171AIDGK is usually 5 days.
3.What payment methods are accepted for OPA2171AIDGK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2171AIDGK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2171AIDGK?
OPA2171AIDGK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2171AIDGK 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 OPA2171AIDGK?
For technical support, including OPA2171AIDGK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2171AIDGK requirements.
6.How does Aetrix verify that OPA2171AIDGK is sourced from the original manufacturer or authorized distributors?
All OPA2171AIDGK 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 OPA2171AIDGK meets industry standards.
7.What is the process for return or replacement of OPA2171AIDGK?
All OPA2171AIDGK units undergo pre-shipment inspection (PSI). If there is an issue with OPA2171AIDGK, 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 OPA2171AIDGK part is unused and in its original packaging.
Return procedure for OPA2171AIDGK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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