STB1081L3

Overview

The STB1081L3 is a high-voltage N-channel Power MOSFET manufactured by onsemi. It features an 800 V drain-source breakdown voltage and a continuous drain current of 10 A at 25°C case temperature. The device utilizes Super Junction technology to achieve low specific on-resistance, with a maximum RDS(on) of 1.4 Ω at a gate-source voltage of 10 V. It is housed in a TO-220AB insulated package, providing electrical isolation from the heatsink. The component operates within a junction temperature range of -55°C to +175°C and includes intrinsic body diode characteristics suitable for switching applications.

Feature Summary

• Super Junction technology enables low conduction losses and improved thermal performance compared to conventional planar structures.
• Integrated thermal insulation isolates the active die from the mounting surface, eliminating the need for external insulating hardware during installation.
• High avalanche energy rating supports robust operation under transient overload conditions.

Applications

• High-frequency power supplies and DC-DC converters
• Motor control circuits and inverters
• Uninterruptible power supply (UPS) systems

Procurement Notes

Verify the specific suffix code against the manufacturer's official datasheet to confirm pinout configuration and packaging variant. Ensure the procurement channel provides traceable documentation confirming the component originates directly from onsemi or an authorized distribution network to prevent counterfeit infiltration. Cross-reference the lot date code with current production status to ensure availability aligns with project timelines without relying on secondary market speculation.

Selection Notes

Select this component when designing circuits requiring high voltage blocking capability combined with moderate current handling in a cost-effective form factor. The TO-220AB insulated package simplifies mechanical assembly by removing the requirement for separate thermal pads or mica washers. Evaluate the thermal resistance parameters relative to the expected ambient temperature and heat sinking strategy to maintain junction temperatures within the specified operational limits during continuous load cycles.

Part Context

This part belongs to onsemi's high-voltage discrete semiconductor portfolio, leveraging proprietary Super Junction architecture. This technology allows for higher efficiency in power conversion stages by reducing switching and conduction losses. The STB series typically targets industrial and consumer power management applications where reliability and thermal stability are critical design constraints.

Replacement Considerations

Consult official cross-reference lists for direct replacements such as the STP10NF80 or similar 800V/10A TO-220 insulated MOSFETs. Verify that any substitute maintains identical pinout compatibility and meets or exceeds the original RDS(on) and avalanche energy specifications to ensure circuit integrity.

FAQ

Does the STB1081L3 package provide electrical isolation?

Yes, the TO-220AB insulated package electrically isolates the drain terminal from the mounting flange, allowing direct attachment to grounded heatsinks without additional insulators.

What is the maximum operating junction temperature?

The maximum operating junction temperature is +175°C, allowing for operation in high-thermal environments.

How does Super Junction technology benefit this MOSFET?

Super Junction technology reduces the specific on-resistance, enabling lower conduction losses and improved overall efficiency compared to traditional planar MOSFETs of similar voltage ratings.