BFL4037-S

Single FETs, MOSFETs Overview

The onsemi BFL4037-S is a discontinued N-channel power MOSFET designed for through-hole mounting in the TO-220FI(LS) package. It features a drain-source voltage (Vdss) of 500 V and a continuous drain current (Id) of 11 A at ambient temperature. The device has a maximum gate-source voltage (Vgs) of ±30 V and a typical gate charge of 48.6 nC at 10 V. Its on-resistance (Rds(on)) is 430 mΩ at 10 V and 8 A. Power dissipation ratings are 2 W at Ta and 40 W at Tc, with an operating junction temperature range of -55°C to 150°C.

Single FETs, MOSFETs Feature Summary

• N-channel enhancement mode MOSFET technology
• Through-hole TO-220FI(LS) package construction
• High voltage capability up to 500 V
• Avalanche rated operation

Single FETs, MOSFETs Applications

• Television power supply circuits
• Industrial motor control systems
• General purpose switching applications

Single FETs, MOSFETs Procurement Notes

Verify component authenticity carefully as this part is obsolete. Confirm exact suffix specifications against original datasheets since the 'S' variant may differ from standard BFL4037. Check replacement availability from authorized distributors or secondary market suppliers due to discontinuation status.

Single FETs, MOSFETs Selection Notes

Select this component only if legacy design compatibility requires the specific TO-220FI footprint and 500 V rating. Evaluate thermal management requirements given the 2 W natural convection limit. Consider modern equivalents with lower Rds(on) if performance upgrades are permissible within the system constraints.

Single FETs, MOSFETs Part Context

The BFL4037 belongs to the BFL40 series of high-voltage N-channel MOSFETs manufactured by onsemi. This series targets robust power switching applications requiring reliable performance in harsh environments. The TO-220FI package provides mechanical stability and efficient heat sinking capabilities for industrial and consumer electronics.

Single FETs, MOSFETs Replacement Considerations

STMicroelectronics offers verified substitute parts including those listed in public databases. Verify pinout compatibility and electrical parameters before substitution. Ensure the replacement device meets the same voltage and current ratings required by the original circuit design.