1 Features
• Best bandwidth and slew-rate-to-power ratio:
– gain-bandwidth product: 5.5 MHz
– Slew rate: 20 V/μs
– Low supply current: 475 μA (maximum)
• High precision:
– Very low offset: 150 μV (maximum)
– Very low offset drift: 1 μV/°C (maximum)
• Low input bias current: 2 pA
• Excellent noise performance:
– Very low voltage noise: 7 nV/√Hz
– Very low current noise: 0.8 fA/√ Hz
• Input-voltage range includes V– supply
• Single-supply operation: 4.5 V to 36 V
• Dual-supply operation: ±2.25 V to ±18 V

2 Applications
• Semiconductor test
• Lab and field instrumentation
• Source measurement unit (SMU)
• Weigh scale
• Intra-DC interconnect (metro)
• Merchant network and server PSU
• DC power supply, ac source, electronic load
• Data acquisition (DAQ)

3 Description
The OPA145 and OPA2145 (OPAx145) devices are
part of a family of low-power JFET input amplifier
that have excellent drift, low current noise, and picoampere
input bias current. These features make the
OPAx145 an excellent choice for amplifying small
signals from high-impedance sensors.
The rail-to-rail output swing interfaces to modern,
single-supply, precision, analog-to-digital converters
(ADCs) and digital-to-analog converters (DACs). In
addition, the input range that includes V– allows
designers to simplify power management and take
advantage of the single-supply, low-noise JFET
architecture.