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Texas Instruments OPA4172IDR
- Part No.:
- OPA4172IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4172IDR.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:59,604
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Product details
Overview
OPA4172IDR from Texas Instruments is a quad, rail-to-rail output, 36-V operational amplifier with JFET-input architecture, ±0.2 mV offset voltage, 10 MHz gain bandwidth, and 7 nV/√Hz input voltage noise density-designed for precision signal conditioning in industrial sensor interfaces and high-voltage power supply monitoring circuits.
For engineers reviewing the OPA4172IDR datasheet, OPA4172IDR pinout, OPA4172IDR application, or OPA4172IDR equivalent, this page delivers verified specifications, SOIC-14 package mapping, real-world use cases in bridge amplifiers and strain gauge systems, and two validated alternative parts with documented functional trade-offs.
Technical Context
The OPA4172IDR employs a high-voltage CMOS process enabling operation from ±2.25 V to ±18 V (or +4.5 V to +36 V single supply), with input common-mode range extending 100 mV beyond the negative rail and within 2 V of the positive rail. Its JFET-input stage delivers ±8 pA typical input bias current and supports rail-to-rail output swing down to 70 mV from each rail at 10 kΩ load under ±18 V supply.
It features 120 dB common-mode rejection (CMRR) at ±18 V, 104 dB minimum CMRR over –40°C to +125°C, and no phase reversal on input overvoltage-critical for robust transducer front-end designs where input signals may transiently exceed supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +4.5 V to +36 V (single supply) or ±2.25 V to ±18 V-supports wide industrial bus voltages without level-shifting. |
| Gain Bandwidth Product | 10 MHz-enables stable unity-gain buffer or G = +10 closed-loop configurations up to ~1 MHz. |
| Input Offset Voltage | ±0.2 mV (typ), ±1.15 mV (max over –40°C to +125°C)-reduces DC error in precision integrators and low-level sensor amplification. |
| Input Voltage Noise Density | 7 nV/√Hz at 1 kHz-low enough for µV-level thermocouple or strain gauge signal conditioning without dominant noise contribution. |
| Slew Rate | 10 V/µs-supports fast settling of 10-V steps in <3.2 µs (0.01% for 12-bit accuracy), suitable for active filter and tracking amplifier response. |
| Output Swing (RL = 10 kΩ) | Within 70 mV of each rail at ±18 V-delivers full dynamic range into high-impedance ADC inputs or downstream comparators. |
| Quiescent Current per Amplifier | 1.6 mA (typ)-balances performance and power in multi-channel systems where thermal budget is constrained. |
Pinout & Package
OPA4172IDR is packaged in a 14-pin SOIC (D package), 8.65 mm × 3.91 mm body size, with exposed pad not present and RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN A (Pin 3) | Noninverting input, Channel A | Accepts high-impedance sensor signals; referenced to V– for single-supply operation with ground-referenced sources. |
| –IN A (Pin 2) | Inverting input, Channel A | Used for feedback network connection in inverting configurations or as summing node in multi-input topologies. |
| OUT A (Pin 1) | Output, Channel A | Rail-to-rail capable; drives loads ≥10 kΩ directly, requires isolation resistor for >100 pF capacitive loads. |
| V+ (Pin 4) | Positive supply | Connects to highest potential rail; must be decoupled with 0.1 µF ceramic capacitor near pin. |
| V– (Pin 11) | Negative supply | Connects to lowest potential rail (GND in single-supply); same decoupling requirement as V+. |
| +IN B (Pin 5) | Noninverting input, Channel B | Independent channel for differential pair processing or dual-sensor readout (e.g., half-bridge + reference). |
| –IN B (Pin 6) | Inverting input, Channel B | Enables matched gain configuration across channels-critical for channel separation >100 dB at dc. |
| OUT B (Pin 7) | Output, Channel B | Electrically isolated from OUT A; supports independent loading and layout routing to minimize crosstalk. |
| +IN C (Pin 10) | Noninverting input, Channel C | Third channel input; enables three-phase sensing or redundant signal paths without external op-amp stacking. |
| –IN C (Pin 9) | Inverting input, Channel C | Supports programmable gain stages per channel using discrete resistors or digital potentiometers. |
| OUT C (Pin 8) | Output, Channel C | Delivers buffered output with same AC/DC specs as Channels A/B-no derating required in quad configuration. |
| +IN D (Pin 12) | Noninverting input, Channel D | Fourth channel for system monitoring (e.g., supply rail sense, temperature compensation reference). |
| –IN D (Pin 13) | Inverting input, Channel D | Allows active filtering or offset correction loop for calibration subsystems. |
| OUT D (Pin 14) | Output, Channel D | Full rail-to-rail drive capability; usable as precision voltage reference buffer or DAC output amplifier. |
Key Features
| Feature | Design Value |
|---|---|
| EMI and RFI filtered inputs | Integrated input-stage filtering suppresses 900-MHz cellular and 2.4-GHz Wi-Fi interference without external RC networks. |
| No phase reversal on overvoltage | Input common-mode range extends 100 mV beyond V– and to within 2 V of V+, preventing latch-up during power sequencing or fault events. |
| Rail-to-rail output swing | Drives 10 kΩ loads to within 70 mV of either rail at ±18 V-maximizes ADC utilization and eliminates need for level-shifting circuitry. |
| Low input bias current (±8 pA) | Minimizes voltage drop across high-value gain-setting resistors (>1 MΩ), preserving gain accuracy in ultra-high-Z sensor interfaces. |
| High CMRR (120 dB) | Rejects common-mode noise from shared power rails or noisy industrial environments-critical for bridge amplifier stability. |
Applications
| Bridge Amplifier | Strain Gauge Amplifier |
|---|---|
|
Use Scenario: Amplifying differential output from full Wheatstone bridge in load cell or pressure transducer. IC Role / Device Role / Timing Role: Quad-channel OPA4172IDR configures two channels as matched instrumentation amplifier core (A/B), one as reference buffer (C), and one as output filter (D). Use Value: 0.2 mV offset and 120 dB CMRR enable sub-0.05% linearity error at full-scale bridge excitation; rail-to-rail output drives 16-bit SAR ADC directly. |
Use Scenario: Signal conditioning for bonded foil strain gauges mounted on structural components in test benches. IC Role / Device Role / Timing Role: Each amplifier channel conditions one gauge quadrant; matched gain/offset ensures thermal drift cancellation across all four elements. Use Value: ±0.3 µV/°C drift and 7 nV/√Hz noise preserve microstrain resolution (<1 µε) in 10-Hz bandwidth applications. |
| Precision Integrator | Temperature Measurement Interface |
|
Use Scenario: Building analog integrator for charge accumulation in photodiode or current-output sensor systems. IC Role / Device Role / Timing Role: Single channel (e.g., Channel A) used with low-leakage capacitor and guarded PCB layout; remaining channels idle or repurposed. Use Value: ±8 pA input bias current limits integration error to <1 mV/s drift at 1 nF capacitance-enabling 10-second integration windows without reset. |
Use Scenario: Linearizing and amplifying output from RTD or thermistor networks in HVAC and industrial control panels. IC Role / Device Role / Timing Role: One channel buffers excitation current source, another amplifies ratiometric voltage, third compensates for lead resistance, fourth filters output. Use Value: 10 MHz bandwidth supports fast thermal transient capture; 1.6 mA per amplifier allows 4-channel operation within 7 mA total supply budget. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4197IDR | Lower offset (±25 µV typ), higher GBP (10 MHz same), but higher quiescent current (1.9 mA per amp) and reduced EMI immunity. | Better for µV-level DC-critical apps (e.g., medical EEG front-end); less suitable for battery-powered or EMI-heavy factory floors. | Select OPA4197IDR only when offset drift <0.1 µV/°C is mandatory and EMI environment is controlled. |
| AD8604ARUZ | Lower noise (5.2 nV/√Hz), lower supply range (up to +16 V), no rail-to-rail input, and 5 V max single-supply rating. | Preferred for low-voltage portable instrumentation; incompatible with 24-V industrial buses or rail-to-rail input requirements. | Choose AD8604ARUZ only for ≤5 V systems where ultra-low noise outweighs supply flexibility and input range needs. |
Compared with OPA4172IDR, OPA4197IDR improves DC precision at the cost of higher power and reduced EMI hardening, while AD8604ARUZ offers superior noise performance but lacks high-voltage operation and true rail-to-rail input-making OPA4172IDR the optimal balance for 12–36 V industrial signal chains requiring robustness, speed, and precision.
Availability
OPA4172IDR is available at Aetrix Electronics and suitable for industrial sensor interfaces, high-voltage power supply monitoring, and precision analog data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA4172IDR 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 over 50 years of innovation in precision amplifiers and high-reliability industrial ICs.
The OPAx172 family-including OPA4172IDR-is engineered for high-voltage, low-noise, rail-to-rail output signal conditioning in harsh industrial environments, targeting applications like motor control feedback, power module tracking, and sensor fusion systems.
FAQ
What is the maximum supply voltage for OPA4172IDR?
The OPA4172IDR supports a maximum supply voltage of +36 V (single supply) or ±18 V (dual supply), with absolute maximum rating of 40 V across V+ and V– pins. Operation above ±18 V risks permanent damage and violates recommended operating conditions defined in the official TI datasheet SBOS618I.
Does OPA4172IDR support rail-to-rail input?
OPA4172IDR does not support full rail-to-rail input. Its input common-mode range extends 100 mV below V– and to within 2 V of V+, enabling operation near the negative rail but requiring headroom at the positive rail. This differs from true rail-to-rail input op-amps and must be accounted for in single-supply designs.
What is the thermal resistance (RθJA) of OPA4172IDR in SOIC-14 package?
The junction-to-ambient thermal resistance (RθJA) for OPA4172IDR in SOIC-14 (D package) is 82.7°C/W, measured on a standard JEDEC 2-layer board with 2 oz copper. This value assumes proper PCB copper pour and thermal vias; actual board layout may raise thermal resistance by 15–25% without optimization.
Can OPA4172IDR drive capacitive loads directly?
OPA4172IDR can drive ≤100 pF capacitive loads stably without external compensation. For larger loads (e.g., ADC input capacitance + PCB trace), a series isolation resistor (typically 20–100 Ω) between amplifier output and load is required to maintain phase margin and prevent peaking or oscillation.
Is OPA4172IDR specified for operation at –40°C to +125°C?
Yes, OPA4172IDR is fully specified over the extended industrial temperature range of –40°C to +125°C. All key parameters-including offset voltage (±1.15 mV max), CMRR (90 dB min), and quiescent current (2 mA max)-are guaranteed across this range per TI's SBOS618I datasheet revision I.
OPA4172IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- 10 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 8 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 1.6mA (x4 Channels)
- Current - Output / Channel:
- 75 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:
- 14-SOIC
OPA4172IDR FAQ
1.How can I place an order for OPA4172IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4172IDR 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 OPA4172IDR reliable?
The price and inventory of OPA4172IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4172IDR is usually 5 days.
3.What payment methods are accepted for OPA4172IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4172IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4172IDR?
OPA4172IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4172IDR 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 OPA4172IDR?
For technical support, including OPA4172IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4172IDR requirements.
6.How does Aetrix verify that OPA4172IDR is sourced from the original manufacturer or authorized distributors?
All OPA4172IDR 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 OPA4172IDR meets industry standards.
7.What is the process for return or replacement of OPA4172IDR?
All OPA4172IDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA4172IDR, 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 OPA4172IDR part is unused and in its original packaging.
Return procedure for OPA4172IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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