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2sd 1802 find substitute on digikey.com??

T

Tim Schwartz

Jan 1, 1970
0
i need to replace the 2sd 1802 npn transistor from the lcd power board.
The transistor is mounted under the board, so i can't use the bigger
one.
I can't find the exact substitute on digikey.com

Specification
Collector-to-Base Voltage VCBO (-)60 V
Collector Current IC (-)3 A

the datasheet for 2sd1802
www.ortodoxism.ro/datasheets/sanyo/ds_pdf_e/2SD1802.pdf

Any suugestion?
Hello,

You could just order a 2SD1802 from MCM Electronics
(mcmelectronics.com) for 38 cents each. I'm sure there are many other
vendors that have them too.

Regards,
Tim Schwartz
Bristol Electronics
 
the 2sd 1802 on the power board is used to driver the lamp
transformers. There are 4 transistors, 2 for each lamp.
I found a similar npn 60v 3a transistor on digikey, but the parameters
are liitle bit different.

The transistor that i found on digikey is STD1805-1
http://catalog.digikey.com/scripts/partsearch.dll?Detail?name=497-3518-5-ND
The original 2sd 1802 datasheet
www.ortodoxism.ro/datasheets/sanyo/ds_pdf_e/2SD1802.pdf

I don't want to go somewhere and be charged for $20 just for 2
transistor
since I have $30 stuff to order in digikey.

What parameters exactly do I have to make sure for substitute the
transistor in ccfl circuit?

Any suugestion?
 
R

Ross Herbert

Jan 1, 1970
0
the 2sd 1802 on the power board is used to driver the lamp
transformers. There are 4 transistors, 2 for each lamp.
I found a similar npn 60v 3a transistor on digikey, but the parameters
are liitle bit different.

The transistor that i found on digikey is STD1805-1
http://catalog.digikey.com/scripts/partsearch.dll?Detail?name=497-3518-5-ND
The original 2sd 1802 datasheet
www.ortodoxism.ro/datasheets/sanyo/ds_pdf_e/2SD1802.pdf

I don't want to go somewhere and be charged for $20 just for 2
transistor
since I have $30 stuff to order in digikey.

What parameters exactly do I have to make sure for substitute the
transistor in ccfl circuit?

Any suugestion?

On most characteristics the 2SD1805 should work but the switching
storage and fall times are considerably higher than the original
transistor. If it were me, I would not leave 2 of the original
transistors insitu with 2 of the replacement transistors just in case
the differing characteristics caused an imbalance sufficient to cause
the inverter to fail again. For the sake of a few $ I would substitute
all 4 transistors so that they are the same.
 
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