OPA4189IPWR

Instrumentation, Op Amps, Buffer Amps Overview

The OPA4189IPWR is a quad precision operational amplifier from Texas Instruments, housed in a 14-pin TSSOP package. It features zero-drift architecture with an input offset voltage of 3 µV maximum and drift of 0.005 µV/°C. The device offers a gain-bandwidth product of 14 MHz and a slew rate of 20 V/µs. It operates on supply voltages ranging from 4.5 V to 36 V, providing rail-to-rail output capability. Key specifications include a common-mode rejection ratio of 168 dB and low noise density of 5.2 nV/√Hz at 1 kHz.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Zero-drift technology ensures ultra-low offset voltage and minimal temperature drift for high DC precision.
• MUX-friendly input architecture prevents inrush current during large differential input voltages, improving settling in multiplexed systems.
• Rail-to-rail output operation allows signal swing close to both supply rails under various load conditions.
• Integrated RFI/EMI filtered inputs provide robust performance against electromagnetic interference.

Instrumentation, Op Amps, Buffer Amps Applications

• Battery testing equipment requiring precise voltage measurement.
• Analog input modules for data acquisition systems.
• Precision weigh scales utilizing bridge sensors.
• DC power supplies and electronic loads needing stable regulation.
• Multifunction relay control circuits.

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific ordering suffix IPWR corresponds to the TSSOP-14 package variant when sourcing. Confirm that the component status is listed as active production data rather than preview or advanced information. Ensure compatibility with standard surface-mount assembly processes for the specified package type.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this device for applications demanding high DC accuracy combined with moderate AC bandwidth. The zero-drift characteristic makes it suitable for low-frequency precision measurements where thermal stability is critical. Compare quiescent current requirements against other zero-drift amplifiers if power consumption is a constraint in the design.

Instrumentation, Op Amps, Buffer Amps Part Context

This component belongs to the OPAx189 family of precision operational amplifiers, which includes single (OPA189) and dual (OPA2189) channel variants. All members share the same core zero-drift architecture and MUX-friendly input design. The quad configuration provides four independent amplifiers in a single package, optimizing board space for multi-channel instrumentation designs.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

Direct pin-compatible replacements within the same family include OPA189 for single-channel needs and OPA2189 for dual-channel configurations. Other Texas Instruments zero-drift amplifiers may require schematic adjustments due to differing pinouts or electrical characteristics.

Instrumentation, Op Amps, Buffer Amps FAQ

What is the maximum input offset voltage for the OPA4189?

The maximum input offset voltage is specified as 3 µV at room temperature and up to 8 µV over the full temperature range of -40°C to 125°C.

How does the MUX-friendly input architecture benefit multiplexed systems?

It prevents inrush current when large differential input voltages are applied, which preserves RC settling performance and improves overall system accuracy in switched applications.

What is the common-mode rejection ratio (CMRR) of this device?

The CMRR is typically 168 dB at a supply voltage of ±18 V and remains above 120 dB across the specified temperature range.