OPA129-W

Instrumentation, Op Amps, Buffer Amps Overview

The OPA129-W is an ultra-low bias current monolithic operational amplifier from Texas Instruments, designed for high-precision applications. It features a BiFET input stage providing extremely low input bias current of 30 fA and input noise current density of 0.0001 pA/√Hz. The device operates on dual supply voltages ranging from ±5 V to ±18 V (total 10 V to 36 V). Key electrical parameters include a gain bandwidth product of 1 MHz, a slew rate of 2.5 V/µs, and a common-mode rejection ratio of 118 dB. It is available in an 8-pin SOIC package with an operating temperature range of -40°C to +125°C.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Ultra-low input bias current achieved through advanced BiFET geometry
• High common-mode rejection ratio for accurate signal processing
• Wide single or dual power supply voltage operation
• Extended industrial temperature range capability

Instrumentation, Op Amps, Buffer Amps Applications

• Photodiode amplifiers
• Electrometer circuits
• Charge amplifiers
• Medical instrumentation

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific suffix 'W' against the manufacturer's official datasheet to confirm it denotes a qualified military or space-grade variant, as standard commercial versions typically lack this designation. Confirm RoHS compliance status and lead time requirements directly with authorized distributors, as availability may vary significantly between commercial and specialized grades.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select the OPA129-W when application requirements demand minimal input current errors, such as in high-impedance sensor interfaces. Ensure the chosen package variant matches the thermal and mechanical constraints of the PCB design. Verify that the required supply voltage range aligns with the system's power architecture and that the extended temperature rating meets environmental specifications.

Instrumentation, Op Amps, Buffer Amps Part Context

The OPA129 belongs to Texas Instruments' Difet family of operational amplifiers, known for combining JFET input stages with bipolar output drivers. This architecture enables ultra-low bias currents while maintaining robust drive capabilities. The OPA129 series is widely recognized for precision analog signal conditioning tasks where leakage currents must be minimized to preserve signal integrity.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

Direct replacements include the OPA129U for commercial grade or OPA129BE4 for lead-free variants. For space-qualified equivalents, verify cross-references with other manufacturers offering radiation-hardened BiFET op-amps with similar bias current specifications.