OPA445ADDAR

Instrumentation, Op Amps, Buffer Amps Overview

The OPA445ADDAR is a high-voltage FET-input operational amplifier manufactured by Texas Instruments. It operates from power supplies ranging from ±10V to ±45V, delivering an output current of 15mA. Key electrical specifications include a slew rate of 15V/µs, input bias current of 10pA, and a gain bandwidth product of 2MHz. The device features laser-trimmed low offset voltage and drift, housed in an SO-8 PowerPAD package for enhanced thermal performance.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• High slew rate of 15V/µs provides wide power-bandwidth response suitable for high-voltage applications
• FET input circuitry enables the use of high-impedance feedback networks while minimizing output loading effects
• Laser trimming of input circuitry yields low input offset voltage and drift characteristics
• SO-8 PowerPAD package design reduces junction temperature through direct PCB soldering

Instrumentation, Op Amps, Buffer Amps Applications

• Test equipment signal conditioning
• High-voltage regulator circuits
• Power amplifier stages
• Data acquisition systems
• Piezo driver interfaces

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific ordering suffix against the manufacturer's Package Option Addendum to confirm packaging type and material composition. Ensure that the selected variant matches the required thermal management strategy and pin compatibility for the target printed circuit board layout.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when operation requires supply voltages up to ±45V with significant output current drive capabilities. The SO-8 PowerPAD package is optimal for designs needing efficient heat dissipation without external heatsinks. Verify stability requirements when driving large capacitive loads or operating at low closed-loop gains.

Instrumentation, Op Amps, Buffer Amps Part Context

This device belongs to the OPA445 family of monolithic operational amplifiers designed for high-voltage environments. It offers standard pinout compatibility across TO-99, DIP-8, and various SO-8 packages, allowing flexibility in mechanical design while maintaining consistent electrical performance profiles for precision analog signal processing.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

Direct replacements include OPA445ADDA for tube packaging variants. Designers should verify thermal resistance parameters and ensure that any substitute maintains the same PowerPAD footprint and pinout configuration to preserve existing board layouts and thermal pathways.

Instrumentation, Op Amps, Buffer Amps FAQ

How should the offset voltage trim pins be utilized?

Offset voltage can be adjusted by connecting a potentiometer between pins 1 and 5. This adjustment should only be used to null the op amp's inherent offset voltage, not to correct system-level offsets.

What are the guidelines for driving capacitive loads?

Low closed-loop gains combined with capacitive loads may decrease phase margin. A series resistor and capacitor network can be added to the output to preserve phase margin and prevent oscillation.

Is the SO-8 PowerPAD package compatible with standard sockets?

Yes, the SO-8 PowerPAD is pin-compatible with standard SO-8 packages and can directly replace operational amplifiers in existing sockets, though soldering the thermal pad to the PCB is always required.