MJ3001 NPN Darlington Power Transistor TO-3 10A
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Prices updated: 13 Oct 2026
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About this product
MJ3001 is an NPN Darlington power transistor in a TO-3 metal case, designed for high-current switching and power amplifier stages. Its high current gain allows it to be driven from low-current circuits. It must be mounted on a heatsink when handling significant power, and it is the NPN partner of the PNP MJ2501 family.
Specifications
- Polarity
- NPN Darlington
- Max collector current
- 10 A
- Package
- TO-3 metal case
Frequently asked questions
Does MJ3001 need a heatsink?
Yes, for any significant power dissipation. Mount the TO-3 case on a heatsink with thermal compound and an insulating washer if the heatsink is connected to a live circuit. Check the power and voltage ratings in the datasheet before use.
How do I drive MJ3001 from a low-current circuit?
Its high current gain lets a small transistor or a logic-level output drive the base through a resistor. Confirm the base drive current in the datasheet, and add a flyback diode when switching inductive loads.
