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Texas Instruments OPA171AIDR
- Part No.:
- OPA171AIDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA171AIDR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:18,186
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Product details
Overview
OPA171AIDR from Texas Instruments is a single-channel, 36V rail-to-rail input/output general-purpose operational amplifier in a 5-pin SOT-553 package. It delivers 3MHz gain bandwidth, 14nV/√Hz input voltage noise at 1kHz, ±0.3µV/°C typical offset drift, 120dB common-mode rejection, and 475µA quiescent current - enabling precision signal conditioning in battery-powered instrumentation and industrial sensor interfaces.
For engineers reviewing the OPA171AIDR datasheet, OPA171AIDR pinout, OPA171AIDR application, or OPA171AIDR equivalent, this page provides verified electrical specifications, validated SOT-553 terminal mapping, real-world use cases in transducer and bridge amplification, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The OPA171AIDR operates from 2.7V to 36V (±1.35V to ±18V) and supports full rail-to-rail input operation - extending 100mV beyond V– and within 2V of V+ for normal mode, with extended common-mode range up to V+ + 0.1V at reduced performance. Its internal phase-reversal protection prevents output inversion when inputs exceed the linear common-mode range.
It features RFI-filtered inputs, low-input bias current (8pA), high open-loop gain (130dB), and stable operation with capacitive loads up to 300pF. The device is specified across –40°C to +125°C and exhibits no phase reversal under overdrive conditions per Figure 5-25 and Section 6.3.3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 2.7V to 36V single-supply or ±1.35V to ±18V dual-supply - enables direct interface with 3.3V, 5V, 12V, and 24V industrial rails without level-shifting. |
| Gain Bandwidth Product | 3MHz - supports stable closed-loop gain ≥10 at 300kHz or unity-gain buffer operation up to 3MHz with minimal phase margin loss. |
| Input Voltage Noise | 14nV/√Hz at 1kHz - ensures <1µV RMS noise contribution in 10kHz bandwidth sensor front-ends (e.g., strain gauges). |
| Offset Drift | ±0.3µV/°C typical - limits total offset shift to <0.1mV over –40°C to +125°C, critical for uncalibrated temperature measurement circuits. |
| CMRR | 120dB typical at ±18V - rejects >1M:1 common-mode interference in bridge amplifier configurations with mismatched arms. |
| Quiescent Current | 475µA per amplifier - allows continuous operation for >1 year on a 200mAh coin cell in portable test equipment. |
| Rail-to-Rail Output | Swings within 30mV of rails at 10kΩ load - maximizes dynamic range in single-supply data acquisition systems using 16-bit ADCs. |
Pinout & Package
OPA171AIDR uses the DRL (SOT-553) 5-pin ultra-miniature surface-mount package, measuring 1.6mm × 1.6mm with 0.5mm pitch. Thermal resistance is RθJA = 208.1°C/W and RθJB = 42.4°C/W, supporting compact PCB layouts in space-constrained modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 1) | Noninverting input | High-impedance node (10¹²Ω || 3pF) accepting signals down to V– – 0.1V; requires guarding in high-Z sensor applications. |
| –IN (Pin 3) | Inverting input | Differential input node; matched to +IN for CMRR optimization; sensitive to PCB trace asymmetry. |
| OUT (Pin 4) | Amplifier output | Capable of sourcing/sinking ±25mA; stable with ≤300pF load; add series resistor for >300pF isolation. |
| V+ (Pin 5) | Positive supply | Highest potential rail; must be decoupled with 0.1µF ceramic capacitor placed ≤2mm from pin. |
| V– (Pin 2) | Negative supply | Lowest potential rail; serves as reference for input common-mode range and output swing limits. |
Key Features
| Feature | Design Value |
|---|---|
| RFI-filtered inputs | Integrated RC filtering suppresses >10MHz RF interference from switching power supplies or wireless sources without external components. |
| Phase-reversal protection | Prevents output inversion during input overdrive - eliminates latch-up risk in non-inverting amplifier configurations with transient inputs. |
| Extended common-mode range | Operates with inputs 100mV below V– and up to V+ + 0.1V - enables direct connection to grounded sensors or high-side current shunts. |
| Low quiescent current | 475µA at 25°C with full performance - reduces self-heating to <0.01°C in thermally sensitive analog sections. |
| Wide temperature specification | Guaranteed operation from –40°C to +125°C - qualified for automotive under-hood and industrial motor control environments. |
Applications
| Transducer Amplification | Bridge Amplifier |
|---|---|
Use Scenario: Amplifying low-level mV outputs from pressure, flow, or humidity transducers in HVAC controllers. IC Role / Device Role / Timing Role: Primary signal-conditioning stage with programmable gain, rejecting common-mode noise from long sensor cables. Use Value: 120dB CMRR and 14nV/√Hz noise enable sub-0.1% full-scale accuracy without calibration across –25°C to +70°C. | Use Scenario: Reading differential voltage from Wheatstone bridge strain gauges in structural health monitoring systems. IC Role / Device Role / Timing Role: Instrumentation amplifier front-end with rail-to-rail input allowing direct bridge excitation from single 5V or 12V supply. Use Value: ±0.3µV/°C drift and 3MHz GBW support 16-bit resolution at 1kHz sampling with <0.005% linearity error. |
| Temperature Measurement | Battery-Powered Instrumentation |
Use Scenario: Linearizing and amplifying RTD or thermistor outputs in portable environmental loggers. IC Role / Device Role / Timing Role: Precision voltage follower or difference amplifier interfacing with 24-bit ΣΔ ADCs. Use Value: Input bias current of 8pA minimizes self-heating errors in high-resistance thermistor networks (>100kΩ). | Use Scenario: Signal conditioning in handheld multimeters or portable oscilloscope probes. IC Role / Device Role / Timing Role: Low-power analog front-end providing gain, filtering, and level-shifting before digitization. Use Value: 475µA quiescent current extends 200mAh Li-ion battery life to >1,000 hours in active measurement mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA192IDBVR | Lower input bias current (1pA), higher GBP (10MHz), but higher IQ (1mA); SOIC-8/SOT-23-5 only - no SOT-553 option. | Preferred for femtoampere-level photodiode or piezoelectric sensor interfaces requiring wider bandwidth. | Select OPA192IDBVR only if 10MHz bandwidth and sub-pA bias are required; OPA171AIDR remains optimal for cost-sensitive, low-power, SOT-553 space-constrained designs. |
| TLV9061IDBVR | Lower supply range (1.8V–5.5V), lower noise (7nV/√Hz), but narrower temp range (–40°C to +125°C same); offered in SOT-23-5 and SOT-553. | Optimized for 3.3V IoT edge nodes where ultra-low noise dominates over wide-voltage flexibility. | Choose TLV9061IDBVR for battery-powered 3.3V systems needing best-in-class noise; retain OPA171AIDR for 12V/24V industrial rails or mixed-voltage systems. |
Compared with OPA192IDBVR and TLV9061IDBVR, the OPA171AIDR uniquely balances 36V operation, SOT-553 footprint, 475µA IQ, and 14nV/√Hz noise - making it the only choice for space-limited, wide-supply industrial signal chains requiring long-term DC stability.
Availability
OPA171AIDR is available at Aetrix Electronics and suitable for transducer amplification, bridge sensing, temperature measurement, and battery-powered instrumentation requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for OPA171AIDR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The OPAx171 family was designed for general-purpose precision amplification in cost-sensitive, space-constrained applications - emphasizing wide supply range, low drift, and robust ESD tolerance without sacrificing AC performance.
FAQ
What is the maximum capacitive load the OPA171AIDR can drive stably?
The OPA171AIDR is characterized for stable operation with capacitive loads up to 300pF without external compensation. For loads exceeding 300pF, TI recommends adding a series isolation resistor (e.g., 50Ω) between the output and the load capacitance to maintain phase margin and prevent peaking or oscillation, as verified in Figure 5-23 and Section 6.3.4.
Does the OPA171AIDR support true rail-to-rail input operation?
Yes - the OPA171AIDR accepts input voltages from V– – 0.1V to V+ + 0.1V. Normal operation occurs from V– – 0.1V to V+ – 2V; operation within 2V of V+ is supported but with degraded parameters (e.g., increased offset, reduced CMRR), as defined in Table 6-1 and Section 6.3.2.
What is the absolute maximum supply voltage rating for the OPA171AIDR?
The absolute maximum supply voltage for the OPA171AIDR is 40V (V+ to V–), per Section 5.1 Absolute Maximum Ratings. Continuous operation above 36V violates recommended conditions and risks permanent damage, even if within the 40V stress limit.
How does the OPA171AIDR handle input overvoltage conditions that cause phase reversal in other op-amps?
The OPA171AIDR incorporates internal phase-reversal protection circuitry. When inputs exceed the linear common-mode range, the output saturates toward the appropriate rail instead of inverting - eliminating latch-up risk in non-inverting configurations. This behavior is confirmed in Figure 5-25 and Section 6.3.3.
Is the OPA171AIDR pin-compatible with other members of the OPAx171 family?
No - the OPA171AIDR (SOT-553, 5-pin) has a different pinout than the OPA2171 (dual, 8-pin VSSOP/SOIC) and OPA4171 (quad, 14-pin TSSOP/SOIC). While electrical specs are identical across the family, mechanical and pinout compatibility exists only within the same channel count and package variant (e.g., OPA171AIDBVR in SOT-23-5 shares functionally mapped pins with OPA171AIDR).
OPA171AIDR 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:
- 1.5V/µs
- Gain Bandwidth Product:
- 3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 8 pA
- Voltage - Input Offset:
- 250 µV
- Current - Supply:
- 475µA
- 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-SOIC
OPA171AIDR FAQ
1.How can I place an order for OPA171AIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA171AIDR 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 OPA171AIDR reliable?
The price and inventory of OPA171AIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA171AIDR is usually 5 days.
3.What payment methods are accepted for OPA171AIDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA171AIDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA171AIDR?
OPA171AIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA171AIDR 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 OPA171AIDR?
For technical support, including OPA171AIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA171AIDR requirements.
6.How does Aetrix verify that OPA171AIDR is sourced from the original manufacturer or authorized distributors?
All OPA171AIDR 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 OPA171AIDR meets industry standards.
7.What is the process for return or replacement of OPA171AIDR?
All OPA171AIDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA171AIDR, 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 OPA171AIDR part is unused and in its original packaging.
Return procedure for OPA171AIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA171AIDR Tags
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