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Your cart is empty. BOJACK High Quality Darlington Transistors
Basic parameters:
Package type: TO-220
Transistor polarity: NPN
Vceo: 100 V
Collector DC current: 3 A
Power consumption: 2 W
DC current gain hFE: 50
Number of pins: 3
Power dissipation (Pd): 40 W
Minimum gain bandwidth ft: 3 MHz
Operating temperature：-65°C - +150°C
Vcbo: 100 V
Surface mount device: Through-hole mounting
Lead-free environmental protection
Jeremy
August 28, 2025
I got these to add a variable resistor and 100uf capacitor for variable power in cobra radios. Worked well and I've already reordered some.
Michel Morin
July 8, 2025
work well on all my project
Brenda K
June 5, 2025
BOJACK TIP31C NPN 3 A 100 V Silicon Epitaxial Power Transistors TIP31 3 amp 100 Volt Darlington Transistors TO-220 (Pack of 20 Pcs).1. Testing on the 1st two transistors I pulled out of the package showed hFEs from 250 to 300. The hfe may be 50, but I am using them as current devices for LEDs. I designed assuming the hFE was close to hfe. Specs from other sites show that these hFE/hfe values can vary with junction temperature from 10 to 125, but 250 to 300 seems a bit high..2. Once I made the necessary corrections in the circuit everything works. For me a DC gain of 250 to 300 works great. I just wish I had known..3. These transistors might not work well as direct replacements in a circuit, but that depends on the circuit and its purpose. Perhaps when used as a switch they may work.
James
May 23, 2025
They work ok, heat up quick. Be sure to have a good heatsink to keep them cool. If it stays cool it works fine. This is a fairchild transistor.
Subsonic12
April 24, 2025
Works great
Wyatt p.
April 10, 2025
Used in a teslacoil
Maleko
February 11, 2025
Best price around I could find on these per unit (using Prime) compared to the 2 main U.S. suppliers that charge nearly as much for shipping as they do for the product. Very useful for low voltage, low current projects around the house or with the kids. ( These are a direct replacement / stand in for BD241C transistors that are no longer in production. )
Bryan Taylor
November 13, 2024
Everything as it should be.
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