The K40B65H2A is the marking used for the AOK40B65H2AL from Alpha & Omega Semiconductor (AOS). It is a high-voltage N-channel IGBT designed for high-frequency power switching. The device combines a 650 V IGBT with an integrated fast, soft-recovery anti-parallel/freewheeling diode.

Deep Specifications

Parameter	Specification
Part Number	AOK40B65H2AL
Marking	K40B65H2A
Device Type	N-channel IGBT
Technology	AlphaIGBT™
Collector-Emitter Voltage (VCE)	650 V
Continuous Collector Current	40 A @ TC = 100°C
Continuous Collector Current	80 A @ TC = 25°C
Pulsed Collector Current	120 A
Gate-Emitter Voltage	±30 V
Package	TO-247
Power Dissipation	Up to 260 W @ TC = 25°C
Junction Temperature	−55°C to +150°C
Integrated Diode	Fast/soft-recovery anti-parallel diode
Main Applications	Welding machines, UPS, solar inverters

The 40 A rating is the continuous collector-current rating at 100°C case temperature; the higher 80 A figure applies at 25°C case temperature, so it should not simply be treated as a continuous 80 A rating under normal thermal conditions.

Key Features

650 V high-voltage rating
40 A continuous current at 100°C case temperature
High 120 A pulsed current capability
Fast switching performance
Low turn-off switching loss
Soft and fast recovery freewheeling diode
Good EMI characteristics
High-frequency switching capability
TO-247 package suitable for heatsinking
Designed for demanding power-electronics applications

Typical Applications

K40B65H2A / AOK40B65H2AL is particularly suitable for:

Welding machines
Solar inverters
UPS systems
High-frequency inverters
DC-AC power converters
High-power switching circuits
Industrial power supplies
Motor/inverter power stages

Pin Configuration

The TO-247 device uses:

Pin 1 → Gate (G)
Pin 2 → Collector (C)
Pin 3 → Emitter (E)

The package diagram in the manufacturer's documentation identifies the device as TO-247 and shows the integrated anti-parallel diode.

K40B65H2A / AOK40B65H2AL – 650V 40A TO-247 N-Channel IGBT