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Texas Instruments OPA172ID
- Part No.:
- OPA172ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA172ID.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,013
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Product details
Overview
OPA172ID from Texas Instruments is a single-channel, 36-V rail-to-rail output operational amplifier with 10-MHz gain bandwidth, ±0.2-mV offset voltage, and 7-nV/√Hz input voltage noise density. It operates from ±2.25 V to ±18 V supplies, supports input common-mode range extending 100 mV beyond the negative rail and within 2 V of the positive rail, and delivers low THD+N (0.00005% at 1 kHz) in precision transducer and bridge amplifier applications.
For engineers reviewing the OPA172ID datasheet, OPA172ID pinout, OPA172ID application, or OPA172ID equivalent, this page provides verified specifications, SOIC-8 package details, real-world performance context for high-voltage industrial signal conditioning, and validated alternative options for design continuity.
Technical Context
The OPA172ID uses a high-voltage CMOS process enabling operation across +4.5 V to +36 V (±2.25 V to ±18 V) while maintaining rail-to-rail output swing and full input common-mode range down to the negative supply. Its architecture avoids phase reversal when inputs exceed rails - a critical feature for fault-tolerant sensor interfaces.
It integrates EMI/RFI-filtered inputs, achieves 120-dB common-mode rejection at DC, and delivers 10-V/µs slew rate with 2-µs settling time to 0.1% for 10-V steps - confirming suitability for fast, high-accuracy closed-loop control and precision data acquisition systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +4.5 V to +36 V (±2.25 V to ±18 V): Enables direct interface with industrial 24-V systems and legacy ±15-V analog backplanes. |
| Gain Bandwidth Product | 10 MHz: Supports stable unity-gain buffer configurations up to ~1 MHz with 60° phase margin into 10-kΩ loads. |
| Input Offset Voltage | ±0.2 mV (typ): Reduces initial error to <0.002% of full-scale in 10-V output circuits without trimming. |
| Input Bias Current | ±8 pA (typ): Allows use with high-impedance sources (e.g., pH electrodes, piezoresistive sensors) without significant voltage drop. |
| THD+N | 0.00005% at 1 kHz, 3.5 VRMS: Meets audio-grade and high-fidelity test equipment requirements for low-distortion amplification. |
| Output Swing | 70 mV from rail (RL = 10 kΩ, VS = +36 V): Delivers >35.9 V output span in single-supply 36-V systems, maximizing dynamic range. |
| Quiescent Current | 1.6 mA per amplifier: Balances speed and power for battery-backed or thermally constrained industrial modules. |
Pinout & Package
OPA172ID is supplied in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, rated for operation from –40°C to +125°C, with junction-to-ambient thermal resistance of 126.5°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output node; capable of sourcing/sinking ±75 mA and driving ≥100-pF capacitive loads stably. |
| 2 | –IN | Inverting input; high-impedance node (10¹³ Ω || 4 pF) with ±8-pA bias current for minimal loading on feedback networks. |
| 3 | +IN | Noninverting input; identical impedance and bias characteristics as –IN, supporting precision differential or instrumentation front-ends. |
| 4 | V– | Negative supply terminal; input common-mode range extends 100 mV below this rail, enabling true single-supply sensor biasing. |
| 5 | NC | No internal connection; electrically isolated, may be left unconnected or tied to ground for mechanical stability. |
| 6 | OUT | Redundant output pin (not used in single-channel OPA172); not connected internally - must remain unconnected. |
| 7 | V+ | Positive supply terminal; supports input common-mode up to (V+) – 2 V, allowing operation near full rail in high-side sensing. |
| 8 | NC | No internal connection; no internal bond wire or circuitry - floating by design, no routing required. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Swings within 70 mV of both supply rails under 10-kΩ load at +36 V, preserving >99.8% of available voltage headroom. |
| EMI/RFI filtered inputs | Integrated input-stage filtering suppresses >1-kHz conducted interference, reducing need for external ferrites in noisy industrial environments. |
| No phase reversal | Input overvoltage beyond rails (up to V+ + 0.1 V or V– – 0.5 V) does not invert output polarity - critical for fault-safe sensor monitoring. |
| Low drift | ±0.3 µV/°C offset drift ensures <0.5-µV total shift over –40°C to +125°C, eliminating recalibration in unheated enclosures. |
| High CMRR | 120 dB at DC enables accurate amplification of mV-level bridge signals in presence of 10-V common-mode noise (e.g., motor drive coupling). |
Applications
| Tracking Amplifier in Power Modules | Transducer Amplifier |
|---|---|
Use Scenario: Closed-loop voltage/current tracking in 24-V industrial SMPS where output must precisely mirror reference under varying load and temperature. IC Role / Device Role / Timing Role: High-speed, low-drift op amp configured as unity-gain buffer and error amplifier in feedback path. Use Value: 10-MHz bandwidth and 10-V/µs slew rate enable sub-µs response to load transients; ±0.2-mV offset minimizes static regulation error. |
Use Scenario: Amplifying low-level outputs from strain gauges, RTDs, or pressure transducers in factory-floor instrumentation. IC Role / Device Role / Timing Role: First-stage signal conditioner providing gain, rail-to-rail output swing, and EMI-hardened input interface. Use Value: ±8-pA input bias prevents error in high-Z Wheatstone bridges; 7-nV/√Hz noise preserves SNR in 24-bit ADC front-ends. |
| Bridge Amplifier | Precision Integrator |
Use Scenario: Differential amplification of full-bridge sensor outputs (e.g., load cells) with common-mode rejection of switching noise from adjacent motor drives. IC Role / Device Role / Timing Role: Instrumentation-grade amplifier with 120-dB CMRR and rail-to-rail output driving ADC reference buffers. Use Value: Input range extending to V– allows direct connection to grounded-sensor bridges; low THD+N maintains fidelity in digital post-processing. |
Use Scenario: Analog integration in PID controllers, waveform generators, or energy metering ICs requiring long-term accuracy and low drift. IC Role / Device Role / Timing Role: Integrator core with ultra-low input bias (±8 pA) and offset drift (±0.3 µV/°C) minimizing output ramp error. Use Value: Sub-nA bias current reduces integration error to <1 µV/s at 100-pF capacitor; 10-MHz GBP supports stable compensation at 10-Hz corner. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA192ID | Lower input bias (±1 pA), higher GBP (20 MHz), but higher quiescent current (1.1 mA vs 1.6 mA) and narrower supply range (+4.5 V to +36 V same, but no ±2.25 V support). | Better for femtoampere-level photodiode amps; less suitable for ±2.25-V low-power portable designs. | Select OPA192ID only if ultra-low IB dominates over supply flexibility and power budget. |
| OPA2188AID | Zero-drift architecture (0.005 µV/°C drift), lower offset (±1 µV), but lower GBP (2 MHz) and higher noise (8.8 nV/√Hz). | Preferred for DC-critical applications like precision weigh scales; unsuitable for >100-kHz signal paths. | Choose OPA2188AID when microvolt-level drift matters more than bandwidth or noise floor. |
Compared with OPA172ID, OPA192ID trades supply flexibility and power efficiency for lower bias current and higher speed, while OPA2188AID sacrifices bandwidth and noise performance to achieve near-zero drift - making OPA172ID the balanced choice for wide-supply, medium-speed industrial signal chains.
Availability
OPA172ID is available at Aetrix Electronics and suitable for industrial power modules, transducer signal conditioning, bridge amplifier circuits, precision integrators, and temperature measurement systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for OPA172ID 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, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The OPA172ID belongs to TI's OPAx172 family of high-voltage, low-noise CMOS op amps designed specifically for precision signal conditioning in harsh industrial environments - emphasizing rail-to-rail operation, EMI robustness, and wide supply tolerance.
FAQ
What is the maximum operating supply voltage for OPA172ID?
The OPA172ID supports a maximum supply voltage of +40 V across V+ and V– terminals, as specified in its Absolute Maximum Ratings. However, its recommended operating range is +4.5 V to +36 V (±2.25 V to ±18 V). Operating continuously at 40 V risks accelerated parametric degradation and is not advised for long-term reliability - always design within the 36-V recommended limit for OPA172ID.
Does OPA172ID support true rail-to-rail input?
The OPA172ID supports rail-to-rail output but not full rail-to-rail input. Its input common-mode range extends 100 mV below V– and up to (V+) – 2 V during normal operation. While it can tolerate inputs up to V+ + 0.1 V, performance degrades within 2 V of V+, so for full top-rail input capability, OPA172ID requires careful biasing - unlike dedicated rail-to-rail input op amps.
Can OPA172ID drive capacitive loads without oscillation?
Yes, OPA172ID is characterized to drive ≥100-pF capacitive loads stably in unity-gain configuration, as confirmed by small-signal step response plots in its datasheet. For loads >100 pF, TI recommends adding an isolation resistor (e.g., 10–50 Ω) between the output and capacitance - a technique validated in the "Capacitive Load Drive Solution" section of the OPA172ID documentation.
What is the thermal resistance (RθJA) of OPA172ID in SOIC-8 package?
The junction-to-ambient thermal resistance (RθJA) for OPA172ID in the SOIC-8 (D) package is 126.5°C/W, measured on a standard JEDEC 2-layer board. This value assumes no copper pour or thermal vias - actual board layout significantly impacts real-world thermal performance, and designers should consult TI's Thermal Metrics report for PCB-specific derating guidance for OPA172ID.
Is OPA172ID pin-compatible with other devices in the OPAx172 family?
No - OPA172ID (single-channel) is not pin-compatible with OPA2172ID (dual) or OPA4172ID (quad), despite shared electrical specs. The SOIC-8 footprint of OPA172ID uses pins 1, 2, 3, 4, 5, 6, 7, and 8 for OUT, –IN, +IN, V–, NC, OUT (redundant), V+, and NC respectively, whereas dual/quad variants assign different functions to those pins. Board redesign is required for substitution.
OPA172ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- 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
- 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
OPA172ID FAQ
1.How can I place an order for OPA172ID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA172ID 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 OPA172ID reliable?
The price and inventory of OPA172ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA172ID is usually 5 days.
3.What payment methods are accepted for OPA172ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA172ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA172ID?
OPA172ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA172ID 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 OPA172ID?
For technical support, including OPA172ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA172ID requirements.
6.How does Aetrix verify that OPA172ID is sourced from the original manufacturer or authorized distributors?
All OPA172ID 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 OPA172ID meets industry standards.
7.What is the process for return or replacement of OPA172ID?
All OPA172ID units undergo pre-shipment inspection (PSI). If there is an issue with OPA172ID, 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 OPA172ID part is unused and in its original packaging.
Return procedure for OPA172ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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