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Texas Instruments OPA172IDR
- Part No.:
- OPA172IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA172IDR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,893
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Product details
Overview
OPA172IDR from Texas Instruments is a 36-V, single-supply, 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 (or +4.5 V to +36 V), supports rail-to-rail input beyond the negative rail by 100 mV and within 2 V of the positive rail, and delivers 10 V/µs slew rate - used in precision transducer amplification and bridge sensor conditioning.
For engineers reviewing the OPA172IDR datasheet, OPA172IDR pinout, OPA172IDR application, or OPA172IDR equivalent, key selection considerations include its wide supply range, low THD+N (0.00005% at 1 kHz), high CMRR (120 dB), EMI-filtered inputs, and SOIC-8 package compatibility with industrial temperature operation (–40°C to +125°C).
Technical Context
The OPA172IDR uses high-voltage CMOS process technology to achieve simultaneous wide supply range (+4.5 V to +36 V), low input bias current (±8 pA), and low quiescent current (1.6 mA per amplifier). Its input stage supports common-mode voltage from (V–) – 0.1 V to (V+) – 2 V, with no phase reversal on overdrive.
It features unity-gain-stable compensation, 10-MHz GBP, and fast overload recovery (200 ns), enabling use in closed-loop precision signal conditioning where stability, speed, and DC accuracy are co-required - such as in strain gauge interfaces with 24-bit ADC front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | +4.5 V to +36 V (single-supply) or ±2.25 V to ±18 V - enables direct interfacing with 24-V industrial rails and battery-powered 5-V systems without level-shifting. |
| Gain Bandwidth | 10 MHz - supports stable unity-gain and G = +10 configurations up to ~1 MHz with <0.1% settling error. |
| Input Offset Voltage | ±0.2 mV (typ), ±1.15 mV (max over –40°C to +125°C) - ensures ≤1 LSB error in 16-bit systems with 10-V full-scale. |
| Input Voltage Noise | 7 nV/√Hz at 1 kHz - critical for low-noise amplification of µV-level thermocouple or bridge outputs. |
| Output Swing | Within 70 mV of rails (RL = 10 kΩ, VS = +36 V) - delivers true rail-to-rail dynamic range for ADC drivers in single-supply data acquisition. |
| THD+N | 0.00005% at 1 kHz, VO = 3.5 VRMS - meets audio-grade and precision test equipment linearity requirements. |
| CMRR | 120 dB (typ, VS = ±18 V) - rejects common-mode interference in noisy industrial environments (e.g., motor drives, PLC I/O). |
Pinout & Package
OPA172IDR is packaged in an industry-standard SOIC-8 (D package), 4.90 mm × 3.91 mm body, with exposed pad not present. Thermal resistance RθJA = 126.5°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output - drives loads ≥2 kΩ directly; requires isolation resistor for >100-pF capacitive loads. |
| 2 | –IN | Inverting input - connects to feedback network; high-impedance (1013 Ω || 4 pF) minimizes loading on sensor sources. |
| 3 | +IN | Noninverting input - accepts signals from (V–) – 0.1 V to (V+) – 2 V; EMI-filtered for robustness in noisy layouts. |
| 4 | V– | Negative supply terminal - referenced to system ground in single-supply configs; must be decoupled with 0.1-µF ceramic. |
| 5 | NC | No internal connection - left unconnected; not usable as thermal pad or auxiliary function. |
| 6 | OUT | Output (duplicate pin for dual-amplifier variants only) - not bonded in OPA172IDR; electrically inactive. |
| 7 | V+ | Positive supply terminal - accepts up to +36 V; supports wide-input-range sensors without external biasing. |
| 8 | NC | No internal connection - unused; must remain floating per TI design guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Within 70 mV of supply rails at 10-kΩ load - preserves full dynamic range for 12-/16-bit SAR and delta-sigma ADCs. |
| EMI and RFI filtered inputs | Integrated RC filtering on +IN/–IN pins - reduces susceptibility to GSM, WiFi, and switching regulator noise without external components. |
| Input beyond negative rail | Operates down to (V–) – 0.1 V - enables direct connection to grounded shunt current-sense resistors without level shifters. |
| Low quiescent current | 1.6 mA per amplifier - allows use in always-on industrial monitoring nodes with <20-mW power budget. |
| No phase reversal | Input overdrive beyond rails does not invert output polarity - prevents latch-up or control loop instability in fault conditions. |
Applications
| Transducer Amplification | Bridge Sensor Conditioning |
|---|---|
|
Use Scenario: Amplifying low-level mV outputs from load cells, pressure sensors, or RTDs in factory automation systems. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with 100-dB CMRR rejecting supply ripple and ground noise. Use Value: ±0.2-mV offset and ±0.3-µV/°C drift ensure <0.01% FSR error over –40°C to +85°C ambient without recalibration. |
Use Scenario: Driving Wheatstone bridge outputs into 24-bit sigma-delta ADCs in weigh scales and medical instrumentation. IC Role / Device Role / Timing Role: Instrumentation amplifier front-end with rail-to-rail output matching ADC reference range. Use Value: 7-nV/√Hz noise and 0.00005% THD+N preserve ENOB >19 bits at 1-kHz signal bandwidth. |
| Precision Integrator | Tracking Amplifier in Power Modules |
|
Use Scenario: Building low-drift analog integrators for PID controllers in servo drives and laser diode current regulation. IC Role / Device Role / Timing Role: Unity-gain stable op amp with ultra-low IB (±8 pA) minimizing capacitor leakage-induced drift. Use Value: Input bias current <10 pA limits integration error to <1 µV/s at 100-nF capacitor - enabling 10-second time constants. |
Use Scenario: Monitoring and regulating output voltage/current in programmable DC power supplies and battery chargers. IC Role / Device Role / Timing Role: High-speed error amplifier in feedback loop with 10-V/µs slew rate and 2-µs 0.1% settling. Use Value: Fast overload recovery (200 ns) and 120-dB PSRR maintain regulation accuracy during transient load steps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA192IDR | Lower offset drift (±0.1 µV/°C), higher CMRR (140 dB), but higher IQ (1.8 mA); same SOIC-8 footprint. | Better for ultra-stable metrology systems requiring <1-ppm/°C gain drift; less optimal for battery-constrained nodes. | Select OPA192IDR when long-term calibration stability outweighs quiescent power savings. |
| AD8675ARZ | Lower noise (2.8 nV/√Hz), lower offset (±25 µV), but narrower supply (±5 V to ±15 V) and no rail-to-rail input beyond negative rail. | Suitable for low-noise, low-offset lab instruments with dual ±12-V supplies; incompatible with 24-V industrial rails. | Choose AD8675ARZ only in fixed dual-supply designs where noise dominates over supply flexibility. |
Compared with OPA172IDR, OPA192IDR improves drift and CMRR at modest IQ cost, while AD8675ARZ trades supply range and rail-to-rail input capability for superior noise and offset - making OPA172IDR the balanced choice for wide-supply, industrial-grade precision amplification.
Availability
OPA172IDR is available at Aetrix Electronics and suitable for industrial sensor interfaces, precision test equipment, and power module feedback loops requiring stable component supply across extended temperature and voltage ranges.
Supply support for OPA172IDR 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, with over 50 years of innovation in precision amplifiers and signal chain ICs.
The OPA172IDR belongs to TI's OPAx172 family of high-voltage CMOS op amps, designed specifically for industrial, test & measurement, and power system applications demanding wide supply range, low noise, and robust DC precision.
FAQ
What is the maximum supply voltage rating for the OPA172IDR?
The OPA172IDR has an absolute maximum supply voltage rating of 40 V across V+ and V– terminals. Its recommended operating range is +4.5 V to +36 V (single-supply) or ±2.25 V to ±18 V (dual-supply), ensuring reliable operation in 24-V industrial systems and high-voltage test equipment. Exceeding 40 V risks permanent damage per JEDEC stress ratings.
Does the OPA172IDR support rail-to-rail input operation?
The OPA172IDR supports rail-to-rail input operation down to (V–) – 0.1 V and up to (V+) – 2 V under normal conditions. It can tolerate input voltages up to (V+) + 0.1 V, but performance degrades within 2 V of the positive rail. This enables direct interfacing with grounded current-sense resistors and simplifies biasing in single-supply sensor front-ends.
What is the typical total harmonic distortion plus noise (THD+N) of the OPA172IDR?
The OPA172IDR achieves a typical THD+N of 0.00005% at 1 kHz with G = +1, VO = 3.5 VRMS, and VS = +36 V. This ultra-low distortion is confirmed in TI's SBOS618I datasheet Figure 15 and supports high-fidelity signal chains in precision audio test gear and calibrated measurement systems where spectral purity is critical.
Can the OPA172IDR drive capacitive loads directly?
The OPA172IDR is not unity-gain stable into purely capacitive loads >100 pF. TI recommends using an isolation resistor (typically 20–100 Ω) between the output and capacitive load to maintain stability and prevent peaking or oscillation. This technique is detailed in Section 11.2 of the SBOS618I datasheet and validated in Figure 23–24 for small-signal step response.
Is the OPA172IDR pin-compatible with other op amps in the OPAx172 family?
The OPA172IDR (SOIC-8) shares identical pinout with the dual-channel OPA2172 in SOIC-8 and VSSOP-8 packages for pins 1–4 and 7–8, but differs in channel count and NC pin assignments. It is not pin-compatible with OPA4172 (14-pin) or SC70/SOT-23 variants. Always verify pin functions per device-specific tables in the SBOS618I datasheet before board reuse.
OPA172IDR 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:
- 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
OPA172IDR FAQ
1.How can I place an order for OPA172IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA172IDR 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 OPA172IDR reliable?
The price and inventory of OPA172IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA172IDR is usually 5 days.
3.What payment methods are accepted for OPA172IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA172IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA172IDR?
OPA172IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA172IDR 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 OPA172IDR?
For technical support, including OPA172IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA172IDR requirements.
6.How does Aetrix verify that OPA172IDR is sourced from the original manufacturer or authorized distributors?
All OPA172IDR 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 OPA172IDR meets industry standards.
7.What is the process for return or replacement of OPA172IDR?
All OPA172IDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA172IDR, 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 OPA172IDR part is unused and in its original packaging.
Return procedure for OPA172IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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