STK531U394C-E

Overview

The STK531U394C-E is a fully integrated Intelligent Power Module (IPM) rated for 600 V and 15 A. It comprises six IGBTs, high-voltage drivers, and a thermistor in a SIP29 package. The module supports PMSM, BLDC, and AC asynchronous motors with separate lower leg emitter connections. Key electrical parameters include a collector-emitter saturation voltage of 1.8 V at 15 A, a forward voltage of 1.8 V, and a supply voltage range of 0 to 450 V. Operating temperatures span -20°C to +100°C.

Feature Summary

• Integrated three-phase bridge with internal bootstrap diodes and resistors
• Built-in cross-conduction protection and adjustable over-current detection
• Under-voltage lockout functions for both main and pre-driver supplies
• Internal thermistor for substrate temperature monitoring

Applications

• Industrial pumps
• Industrial fans
• Heat pumps and home appliances
• Industrial automation systems

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm compliance status and production site details. Ensure that the application circuit design accounts for the required external components, such as pull-up resistors for the FAULT terminal and bootstrap capacitors. Confirm thermal interface material specifications and mounting torque requirements to maintain device reliability during operation.

Selection Notes

Select this IPM for applications requiring a compact, fully integrated power stage for motor control. The device simplifies design by embedding gate drivers and protection logic. Verify that the system's bus voltage remains within the 450 V maximum rating. Ensure adequate heat sinking is provided to manage the junction-to-case thermal resistance under expected load conditions.

Part Context

This component belongs to the Intelligent Power Module family from onsemi. It integrates power switching elements with control logic to reduce board space and complexity. The SIP29 single inline package facilitates mounting on standard heatsinks. The module is designed for robust performance in industrial and consumer motor drive environments.

Replacement Considerations

Consult official onsemi documentation for verified substitute part numbers. Cross-referencing requires matching voltage ratings, current capabilities, pin configurations, and thermal characteristics. Do not assume compatibility based solely on package dimensions or general category features.

FAQ

How is the over-current protection level adjusted?

The over-current protection threshold is adjustable using an external resistor connected between the ISD terminal and the VSS terminal.

What is the function of the FAULT terminal?

The FAULT terminal is an open-drain output that signals undervoltage or over-current conditions. It also serves as an enable input to shut down the built-in drivers when pulled low.

How does the internal thermistor operate?

A thermistor is connected between the VSS and TH terminals to monitor the internal substrate temperature. An external pull-up resistor is required to read the voltage change corresponding to temperature variations.