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Texas Instruments OPA2172IDRGT
- Part No.:
- OPA2172IDRGT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
OPA2172IDRGT.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:224
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Product details
Overview
OPA2172IDRGT from Texas Instruments is a dual, 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 and supports precision signal conditioning in industrial power modules and transducer interfaces.
For engineers reviewing the OPA2172IDRGT datasheet, OPA2172IDRGT pinout, OPA2172IDRGT application, or OPA2172IDRGT equivalent, this page delivers verified electrical specs, SOIC-8 package details, dual-channel functional context, and validated alternative options for high-voltage, low-noise analog signal chains.
Technical Context
The OPA2172IDRGT implements a high-voltage CMOS input stage enabling rail-to-rail output swing and full common-mode input range extending 100 mV beyond the negative rail and within 2 V of the positive rail. Its 10-MHz unity-gain bandwidth and 10-V/µs slew rate support stable closed-loop operation at gains ≥1 with 10-kΩ loads.
It features EMI/RFI-filtered inputs, 120-dB CMRR, ±8-pA input bias current, and 1.6-mA per amplifier quiescent current-optimized for single-supply systems requiring wide dynamic range and low distortion across –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | +4.5 V to +36 V (±2.25 V to ±18 V); enables direct interface with industrial 24-V rails and legacy ±15-V systems |
| Gain Bandwidth | 10 MHz; supports stable unity-gain buffers and G = +2–+10 amplifiers up to ~1–5 MHz with minimal phase margin loss |
| Input Offset Voltage | ±0.2 mV (typ); reduces DC error in precision gain stages without trimming, critical for strain gauge and temperature measurement front-ends |
| Input Voltage Noise | 7 nV/√Hz @ 1 kHz; maintains SNR > 90 dB in 20-kHz audio and sensor signal paths with 10-kΩ source impedances |
| Output Swing | Within 70 mV of rails @ 36 V / 10 kΩ; delivers >35-VPP dynamic range in single-supply data acquisition systems |
| Quiescent Current | 1.6 mA per amplifier; balances performance and power in always-on monitoring circuits with thermal constraints |
| Common-Mode Range | (V–) – 0.1 V to (V+) – 2 V; allows direct sensing of signals referenced to negative supply or ground in high-side current monitors |
Pinout & Package
OPA2172IDRGT is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with exposed pad not present and RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output; drives 10-kΩ loads to within 70 mV of rails; requires local 100-pF bypass capacitor for stability with capacitive loads |
| 2 | –IN A | Inverting input, channel A; high-impedance CMOS node (10¹³ Ω || 4 pF); sensitive to PCB leakage and EMI without guard ring |
| 3 | +IN A | Noninverting input, channel A; accepts common-mode voltages down to V– – 0.1 V; used for reference-biased sensor interfaces |
| 4 | V– | Negative supply terminal; must be connected directly to low-impedance ground plane; shared return for both amplifiers |
| 5 | +IN B | Noninverting input, channel B; electrically isolated from channel A; enables dual-path signal conditioning without crosstalk |
| 6 | –IN B | Inverting input, channel B; matched to –IN A for differential pair configurations; supports active filtering with identical RC networks |
| 7 | OUT B | Amplifier B output; independent drive capability; allows simultaneous buffering of two sensor outputs or split-phase feedback paths |
| 8 | V+ | Positive supply terminal; decoupled with 1-µF ceramic + 100-nF ceramic near pin; supports 36-V maximum operating voltage |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Delivers >99% of full supply swing at 10-kΩ load, eliminating level-shifting circuitry in 3.3-V/5-V microcontroller ADC interfaces |
| EMI/RFI filtered inputs | Integrated RC filters suppress >100-MHz RF interference without external components-critical for motor-drive and switching-power environments |
| No phase reversal | Input overvoltage beyond rails (up to V+ + 0.1 V) does not invert output polarity, preventing latch-up in fault-tolerant protection circuits |
| Low offset drift | ±0.3 µV/°C (max) ensures <1-µV total drift over –40°C to +125°C, enabling uncalibrated operation in outdoor industrial enclosures |
| High CMRR | 120 dB (min) rejects common-mode noise from long sensor cables and noisy shared grounds in PLC analog I/O modules |
Applications
| Tracking Amplifier in Power Modules | Transducer Amplifiers |
|---|---|
Use Scenario: High-accuracy voltage feedback loop in 24-V DC-DC converters, where output voltage must track reference within ±0.1% across load and temperature. IC Role / Device Role / Timing Role: Dual op-amp configured as precision error amplifier (A) and current-sense buffer (B), operating at ±15 V with 10-MHz bandwidth. Use Value: ±0.2-mV offset and 120-dB CMRR minimize regulation error from ground bounce and ripple coupling, achieving <0.05% line/load regulation. |
Use Scenario: Signal conditioning for 350-Ω strain gauges in weigh scales, requiring low-noise amplification and bridge excitation. IC Role / Device Role / Timing Role: Instrumentation-grade dual amplifier implementing Wheatstone bridge interface with gain = 100 and 10-Hz low-pass filtering. Use Value: 7-nV/√Hz noise and ±8-pA bias current preserve microvolt-level bridge imbalance signals, enabling 24-bit resolution without chopper stabilization. |
| Bridge Amplifiers | Temperature Measurements |
Use Scenario: Differential amplification of full-bridge pressure sensors in HVAC control systems, operating from 24-V supply with 4–20-mA output. IC Role / Device Role / Timing Role: Channel A as bridge differential amplifier (G = 200), Channel B as 4–20-mA loop driver with rail-to-rail output swing. Use Value: Matched input offset and drift between channels ensure <0.01% gain error over temperature, meeting ANSI/ISA-71.04 Class G2 corrosion standards. |
Use Scenario: Linearization and amplification of PT100 RTD signals in industrial process controllers, using 3-wire configuration and cold-junction compensation. IC Role / Device Role / Timing Role: Dual amplifier implementing constant-current excitation (A) and ratiometric differential amplification (B) with 100-Ω reference. Use Value: Input range including V– allows direct grounding of RTD low-side; ±0.3-µV/°C drift limits temperature error to <0.05°C over –40°C to +125°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-voltage operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2182IDR | Lower offset (±4 µV), lower noise (5.7 nV/√Hz), higher cost; 5.7-MHz GBP, 2.5-mA IQ | Better for ultra-precision DC-coupled systems (e.g., calibration equipment); less suitable for >5-MHz signal paths | Select when offset drift <0.1 µV/°C and THD+N <–120 dB are mandatory; avoid if bandwidth >6 MHz required |
| AD8638ARZ-REEL7 | Higher offset (±125 µV), higher noise (11 nV/√Hz), wider temp range (–40°C to +125°C); 1.2-MHz GBP, 1.2-mA IQ | Cost-optimized for non-critical industrial sensors; lacks EMI filtering and rail-to-rail output | Select for budget-sensitive designs where 12-bit accuracy suffices and EMI immunity is managed externally |
Compared with OPA2172IDRGT, OPA2182IDR trades bandwidth and quiescent current for ultra-low drift and noise-ideal for metrology-but AD8638ARZ-REEL7 sacrifices precision and speed for cost and simplicity in basic sensor buffering.
Availability
OPA2172IDRGT is available at Aetrix Electronics and suitable for industrial power modules, transducer interfaces, and precision temperature measurement systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA2172IDRGT 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 decades of expertise in precision op-amps and high-reliability industrial ICs.
The OPAx172 family-including OPA2172IDRGT-is designed for high-voltage, low-noise signal conditioning in demanding industrial, test, and measurement applications where rail-to-rail output, EMI robustness, and wide temperature operation are essential.
FAQ
What is the maximum supply voltage rating for the OPA2172IDRGT?
The OPA2172IDRGT 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 (±2.25 V to ±18 V). Operation above 36 V risks exceeding safe junction temperature and violates the manufacturer's specified conditions-always limit continuous operation to ≤36 V to ensure reliability and maintain 120-dB CMRR performance in the OPA2172IDRGT.
Does the OPA2172IDRGT support true rail-to-rail input operation?
The OPA2172IDRGT supports rail-to-rail *output*, but its input common-mode range extends only to (V–) – 0.1 V and (V+) – 2 V under normal operation. While it can tolerate input voltages up to (V+) + 0.1 V without phase reversal, full rail-to-rail input is not supported-the upper 2 V near V+ incurs degraded CMRR and increased offset. This behavior is explicitly documented in the OPA2172IDRGT datasheet Section 3.
What package type is used for the OPA2172IDRGT?
The OPA2172IDRGT uses an 8-pin SOIC (D) package with body dimensions of 4.90 mm × 3.91 mm. This is distinct from the VSSOP-8 (DGK) and WSON-8 (DRG) variants in the same family. The 'DRGT' suffix confirms the SOIC-8 packaging, and pin functions align with the D-package pinout shown in Figure 6 of the OPA2172IDRGT datasheet.
Can the OPA2172IDRGT drive capacitive loads without instability?
The OPA2172IDRGT can drive up to 100 pF capacitive loads while maintaining ≥45° phase margin, as verified in Figure 23–24 of the OPA2172IDRGT datasheet. For loads >100 pF, an isolation resistor (typically 10–50 Ω) must be placed in series with the output. This design requirement is inherent to the OPA2172IDRGT's internal compensation and is not mitigated by external feedback network changes alone.
How does the OPA2172IDRGT perform in terms of THD+N at audio frequencies?
At VS = +36 V, G = +1, f = 1 kHz, and VO = 3.5 VRMS, the OPA2172IDRGT achieves 0.00005% THD+N (–126 dB), as specified in Section 7.7 of its datasheet. This performance holds for RL = 10 kΩ and is enabled by its 10-MHz GBP and low 7-nV/√Hz noise floor-making the OPA2172IDRGT suitable for high-fidelity audio line drivers and precision test-tone generation.
OPA2172IDRGT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- 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 (x2 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:
- 8-SON (3x3)
OPA2172IDRGT FAQ
1.How can I place an order for OPA2172IDRGT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2172IDRGT 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 OPA2172IDRGT reliable?
The price and inventory of OPA2172IDRGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2172IDRGT is usually 5 days.
3.What payment methods are accepted for OPA2172IDRGT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2172IDRGT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2172IDRGT?
OPA2172IDRGT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2172IDRGT 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 OPA2172IDRGT?
For technical support, including OPA2172IDRGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2172IDRGT requirements.
6.How does Aetrix verify that OPA2172IDRGT is sourced from the original manufacturer or authorized distributors?
All OPA2172IDRGT 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 OPA2172IDRGT meets industry standards.
7.What is the process for return or replacement of OPA2172IDRGT?
All OPA2172IDRGT units undergo pre-shipment inspection (PSI). If there is an issue with OPA2172IDRGT, 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 OPA2172IDRGT part is unused and in its original packaging.
Return procedure for OPA2172IDRGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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