Texas Instruments OPAx371D Decompensated Amplifier
Texas Instruments OPAx371D Decompensated Amplifier features a 125kHz wide gain bandwidth, 650nA/ch low quiescent current, and 500fA low input bias current. This amplifier operates from a 1.5V to 5.5V supply voltage with rail-to-rail input and output swing, and decompensated gain of ≥10V/V (stable). The OPAx371D decompensated amplifier includes single decompensated operational amplifiers optimized for high efficiency in ultra-low-voltage applications. This amplifier enables high-gain circuit configurations and longevity in battery-powered systems. Typical applications include portable electronics, medical sensor patches, CO detectors, active filters, audio microphone preamplifiers, pulse oximeters, and low-side current sensing.
Features
- 125kHz wide gain bandwidth product
- 650nA/ch low quiescent current
- Operational from supply voltage as low as 1.5V
- 3.9µVp-p low integrated noise (0.1Hz to 10Hz)
- ±0.3mV low input offset voltage
- 500fA low input bias current
- Rail-to-rail input and output
- Decompensated, gain ≥10V/V (stable)
- Integrated RFI and EMI filters
- -40°C to +125°C extended industrial temperature range
Applications
- Portable electronics
- Medical sensor patch
- CO Detector
- Active filters
- Audio microphone preamplifier
- Low-side current sensing
- Motion detector (PIR, uWave, and so forth)
- Pulse oximeter
Functional Block Diagram
Typical Application Diagram
Bridge Amplifier Circuit
Published: 2026-10-13
| Updated: 2026-10-16