APT50M38JLL MOSFET — Specifications & Equivalents

About the APT50M38JLL

The APT50M38JLL is a MOSFET with a drain–source voltage (V_DS) rating of 500 V and a continuous drain current (I_D) of 91 A. It can dissipate up to 775 W and is rated to a junction temperature of 150 °C. It is supplied in the SOT227 package.

At a glance

• Type: MOSFET
• Max drain–source voltage (V_DS): 500 V
• Max continuous drain current (I_D): 91 A
• Power dissipation (P_D): 775 W
• Max junction temperature (T_J): 150 °C
• Package: SOT227
• Manufacturer: Commonly produced by Advanced Power Technology (now Microchip)

Typical applications

With its 500 V drain–source rating the APT50M38JLL sits in the high-voltage (offline) class of switching MOSFETs, typically found in primary-side switching in offline SMPS (flyback, forward and quasi-resonant), active PFC boost stages, half-bridge and full-bridge inverters, induction heating and electronic ballasts and BLDC and AC motor drives. The rating leaves usable margin above the ~325 V DC bus obtained by rectifying 230 VAC mains, which is why this class dominates offline power supplies.

The 91 A current rating puts it in high-current territory, where conduction loss (I² × R_DS(on)) and thermal design usually matter more than switching loss. Budget for adequate copper area and a heatsink.

Gate drive and switching notes

Keep gate–source voltage within the ±30 V maximum; exceeding it punctures the gate oxide and destroys the device permanently.

Switching behaviour is characterised by an output capacitance (C_oss) of 2610 pF, which together with the gate drive determines switching loss and the practical upper frequency limit.

Choosing a replacement for the APT50M38JLL

A drop-in substitute for the APT50M38JLL should match its polarity and offer a drain–source rating of at least 500 V and a continuous drain current rating of at least 91 A.

Mechanically, check the replacement against the SOT227 footprint and confirm the pin order — parts sharing a package outline do not always share a pinout.

Where the application switches inductive loads or runs near the voltage limit, keep extra headroom rather than choosing a part that only just meets the original numbers.

Frequently asked questions

What is the APT50M38JLL?

The APT50M38JLL is a MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 500 V drain-source and 91 A continuous drain current.

What is the maximum voltage of the APT50M38JLL?

The APT50M38JLL has a maximum drain-source voltage (Vds) of 500 V. Treat this as an absolute maximum and design with margin, especially when switching inductive loads.

How much current can the APT50M38JLL handle?

It is rated for 91 A of continuous drain current, with power dissipation limited to 775 W. Real-world capability depends on your heatsinking and ambient temperature.

What package does the APT50M38JLL come in?

It is listed in SOT227. Verify the pinout of the specific variant, as one outline can carry different pin assignments.

What can I use to replace the APT50M38JLL?

This page lists 17 candidate equivalents matched on electrical ratings and package. Any replacement should meet or exceed the original voltage, current and dissipation figures and use a compatible drive level.