BL3891 Precision Operational Amplifier, Low Offset, Rail-to-Rail I/O, SOT23-5

The BL3891 is a single-channel precision operational amplifier designed for low-voltage, high-accuracy signal conditioning applications. Featuring a maximum input offset voltage of 38µV and low input bias current, it delivers stable and precise amplification even in sensitive analog circuits.
Operating from a 1.8V to 5.5V supply, the BL3891 provides rail-to-rail input and output performance, ensuring maximum signal swing in low-voltage systems. With a 1.8MHz gain bandwidth and 0.95V/µs slew rate, it is well suited for precision measurement, sensor interfaces, and portable electronics. The compact SOT23-5 package enables easy integration into space-constrained designs.

Key Specifications

• Channels: 1

• Noise Density: 30nV/√Hz @1kHz (Typ)

• Supply Voltage: 1.8V – 5.5V

• Gain Bandwidth (GBW): 1.8MHz

• Slew Rate: 0.95V/µs

• Quiescent Current (Iq/CH): 180µA

• Input Bias Current: 20pA

• Maximum Offset Voltage (Vos): 38µV

• Rail-to-Rail Input/Output: Yes

• Package: SOT23-5

Applications

• Precision sensor signal conditioning

• Battery-powered and portable devices

• Data acquisition systems

• Industrial and instrumentation circuits

Features

• Ultra-low offset voltage

• Rail-to-rail input and output

• Low noise performance

• Low-voltage operation

• Compact SOT23-5 package