FSB50250UD

Overview

The FSB50250UD is a Smart Power Module (SPM) from the Motion SPM 5 Series, manufactured by Fairchild Semiconductor. It integrates a three-phase inverter bridge designed for AC induction motor control. The module features a maximum collector-emitter voltage of 500 V and a typical switching frequency of 15 kHz. It utilizes through-hole installation in a PDIP package with 23 pins. The device supports a maximum operating supply voltage of 400 V and provides an isolation rating of 1500 Vrms. The operational temperature range spans from -40 °C to +150 °C.

Feature Summary

• Integrates a complete three-phase inverter bridge within a single compact module.
• Includes built-in protection mechanisms for overcurrent, overvoltage, and thermal shutdown.
• Provides high-voltage galvanic isolation between control and power circuits.

Applications

• AC induction motor drive systems
• Blower and fan speed control applications
• Compressor motor control

Procurement Notes

Verify the specific suffix 'UD' against official onsemi/Fairchild documentation to confirm pinout and feature set, as suffixes often denote package or tape-and-reel variations. Ensure compatibility with existing PCB footprints for the 23-pin PDIP configuration. Confirm that the 1500 Vrms isolation rating meets system safety requirements. Cross-reference the manufacturer part number with current onsemi catalogs due to corporate acquisition history.

Selection Notes

Select this component when designing low-power AC induction motor controllers requiring integrated gate drivers and protection. The 500 V rating suits standard single-phase or low-voltage three-phase supplies. Consider the 23-pin PDIP package for prototyping or applications where surface-mount density is not critical. Verify that the 15 kHz switching frequency aligns with acoustic noise and efficiency targets for the specific motor load.

Part Context

This part belongs to the Motion SPM 5 Series, which consolidates power switches, drivers, and protection logic into one unit. Fairchild Semiconductor was acquired by onsemi, and these products are now managed under the onsemi portfolio. The series is engineered to simplify motor control design by reducing component count and board space compared to discrete solutions.

Replacement Considerations

FSB50250U: Similar SPM 5 series module; verify if the 'U' suffix indicates a different package or reel type than 'UD'. FSB50250BS: SPM 5 series variant with SMD/SMT mounting; requires different PCB layout. FSB50325S: Higher current rating variant; check thermal management requirements.