OPA2172 - Dual 36V 10MHz Low-Noise Op Amp | Texas Instruments
MPN: OPA2172ID ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.66 | $16.60 |
| 100 | $1.32 | $132.00 |
| 500 | $1.12 | $560.00 |
| 1,000 | $0.94 | $940.00 |
Drop-in alternatives for OPA2172ID — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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OPA1688
⚡ Same Package✓ In Stock
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View Datasheet →LM358QDRQ1
⚡ Same Package✓ In Stock
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View Datasheet →OPA2172ID Maximum Ratings & Electrical Characteristics
| Channels | 2 |
| Supply Voltage Range | +4.5 V to +36 V (±2.25 V to ±18 V) |
| Gain Bandwidth Product | 10 MHz |
| Input Offset Voltage | ±0.2 mV |
| Offset Voltage Drift | ±0.3 uV/C |
| Input Bias Current | ±8 pA |
| Quiescent Current | 1.6 mA per amplifier |
| Noise Density | 7 nV/√Hz |
| Output Type | Rail-to-Rail Output |
| Slew Rate | [DATA_NEEDED: slew rate] |
| Operating Temperature | -40C to +125C |
| Package | 8-SOIC (D) |
| Mounting Type | Surface Mount |
| Amplifier Type | General Purpose / Precision |
| RoHS Status | Compliant |
OPA2172ID Pin Configuration
| Pin 1 | OUT A — Output of amplifier A |
| Pin 2 | IN A- — Inverting input A |
| Pin 3 | IN A+ — Non-inverting input A |
| Pin 4 | V- — Negative supply (or GND in single supply) |
| Pin 5 | IN B+ — Non-inverting input B |
| Pin 6 | IN B- — Inverting input B |
| Pin 7 | OUT B — Output of amplifier B |
| Pin 8 | V+ — Positive supply |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
OPA2172ID is suitable for 6 applications: Motor Control Current Sensing, Solar Inverter Power Stages, Audio Signal Processing, Power Supply Feedback Loops, Industrial Process Control Sensing, Automotive Signal Conditioning.
Motor Control Current Sensing
The OPA2172 amplifies small current-sense signals in 24 V or 48 V motor drives, where its ±0.2 mV offset and ±0.3 uV/C drift preserve accuracy across temperature. The 10 MHz bandwidth supports fast feedback loops for torque control, while the 36 V supply range allows direct connection to industrial rail-derived supplies. Rail-to-rail output maximizes ADC input range, improving measurement resolution in FOC motor controllers paired with TI C2000 MCUs such as the TMS320F28034-Q1.
Recommended
Solar Inverter Power Stages
In solar inverters, the OPA2172 conditions voltage and current feedback signals for MPPT and grid-synchronization control. Its wide +4.5 V to +36 V supply range tolerates industrial supply variation, and 7 nV/√Hz noise keeps small-signal sensing clean in electrically noisy switching environments. The rail-to-rail output fully utilizes low-voltage ADC input ranges, and the low 1.6 mA per amplifier quiescent current reduces standby losses in energy-harvesting equipment where every milliwatt counts.
Recommended
Audio Signal Processing
The OPA2172 serves as a low-noise preamp, active filter, and DAC output buffer in professional and consumer audio. Its 7 nV/√Hz voltage noise and 10 MHz bandwidth preserve transient fidelity, and the high slew rate prevents slew-induced distortion on high-amplitude line-level signals. Audio synth designers commonly substitute it for the noisier TL072 (as noted in the O_C module community). Its rail-to-rail output maximizes headroom on single-supply audio rails without large coupling capacitors.
Recommended
Power Supply Feedback Loops
The OPA2172 implements error amplifiers and loop compensation in AC-DC and DC-DC power supplies. With a 36 V supply rating, it can monitor high-voltage rails directly through dividers, while the ±0.2 mV offset tightens output regulation accuracy. The 10 MHz bandwidth supports fast transient-response loops in designs using TI UCC and TPS controllers. Rail-to-rail output lets the error amp swing fully across the controller reference range for precise duty-cycle control.
Recommended
Industrial Process Control Sensing
In factory instrumentation, the OPA2172 amplifies signals from pressure, temperature, and pH sensors. The ±8 pA CMOS bias current suits high-impedance piezo and glass-electrode sources, and ±0.3 uV/C drift keeps calibration stable across -40C to +125C industrial ranges. The 4.5 V minimum supply works with 5 V logic rails, while the 36 V maximum tolerates 24 V industrial buses. Its dual channel allows a sense amplifier plus an active anti-aliasing filter in a single SOIC-8 footprint.
Recommended
Automotive Signal Conditioning
Using the AEC-Q100 qualified OPA2172-Q1 variant, this op amp conditions battery-voltage, current, and position-sensor signals in automotive ECUs. The 36 V rating covers load-dump and 12 V battery transients with margin, and the -40C to +125C temperature range meets underhood requirements. Low offset drift ensures long-term accuracy in safety-relevant monitoring. Pairs with TI automotive ADCs and isolated amplifiers for battery-management and traction-invertor sensing chains.
Recommended
Recommended Products Summary
Engineering reference data for OPA2172ID — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | OPA2172AID | OPA2171AID | OPA1688 | LM358QDRQ1 |
|---|---|---|---|---|---|
| Package | 8-SOIC (D) | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC (D) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Supply Voltage Max | 36 V | 36 V | 36 V | 24 V | 32 V |
| Gain Bandwidth | 10 MHz | 10 MHz | 3 MHz | 10 MHz | ~1 MHz |
| Offset Voltage | ±0.2 mV | ±0.2 mV (tighter A-grade limit) | ±0.025 mV | ±0.3 mV | ±3 mV |
| Noise Density | 7 nV/√Hz | 7 nV/√Hz | 18 nV/√Hz | 10.5 nV/√Hz | 40 nV/√Hz |
| Quiescent Current | 1.6 mA per amp | 1.6 mA per amp | 0.475 mA per amp | 0.5 mA per amp | 0.5 mA per amp |
| Output Type | Rail-to-Rail Output | RRO | RRO | RRO | Not RRO |
| Automotive Grade | No (Q1 variant available) | No | Q1 available | No | Yes (Q1) |
Key Differentiators
- 36 V supply with 10 MHz bandwidth combination (vs LM358QDRQ1)
- Much lower offset than budget precision parts (vs LM358QDRQ1)
- Higher supply headroom than OPA1688 (vs OPA1688)
Design Notes
Place 0.1 uF ceramic decoupling capacitors directly across the V+ (pin 8) and V- (pin 4) pins with short, low-inductance returns. At 10 MHz bandwidth, long supply traces can resonate with parasitic inductance and cause peaking. A small (10-22 ohm) series resistor or ferrite bead in the supply line plus local capacitance improves noise isolation in mixed-signal boards.
For best noise performance in transimpedance and precision gain stages, keep feedback resistor values low; the OPA2172's 7 nV/√Hz noise is only realized when resistor thermal noise is below amplifier noise (e.g., use <10 kohm feedback in low-gain stages). The CMOS ±8 pA bias current permits large input resistors without DC error, but verify stability with input capacitance.
The rail-to-rail output swing degrades under heavy load - check output swing versus load curves in the TI OPAx172 datasheet when driving low-impedance loads near the rails. Do not exceed 36 V absolute maximum supply, and note input common-mode range does not include the positive rail, so non-inverting gain configurations must keep input voltages below approximately (V+) - 2 V.
Compliance Information
RoHS compliant per TI product page. AEC-Q100 grade available via OPA2172-Q1 variant.
