smd parts

[timwebb]

i wanted to make sure this was right. the marking om the part is 2t on a cart i have it says its 2n44403. is this correct?

[seankane]

Originally Posted by timwebb

i wanted to make sure this was right. the marking om the part is 2t on a cart i have it says its 2n44403. is this correct?

Its actually 2N4403 you have to many 4's in the part number you listed.

2T
p2T
t2T

All of those are the same 2N4403 part number

Try using MMBT4403 when looking up the part. They are all SOT23 package and from what I could find: PNP 80V 100Ma

[timwebb]

ok thanks!

[Perry Babin]

If you have any MMBTA56s on hand, they will generally serve as a suitable substitute for the 4403.

[timwebb]

can i replace 2N4401 with MMBTA42?

[Perry Babin]

Are these for the same section as the previous transistors you asked about?

How are they being used in the amp?

What amp is it?

[timwebb]

yes.the output drive transistors. one side of out puts works as it should. the other side is making the speaker osc really bad. all 640's are brand new

[Perry Babin]

Please answer all of the questions.

[timwebb]

yes its for the same section.its
being used in the output driver circuit.
an audio pipe 1800

[Perry Babin]

The a42 is a slower transistor and may run hotter. I'd suggest that you wait and get all of the correct parts for this amp. Class D amps can be finicky and using subs (especially multiple subs) could cause problems. The problems may not be immediately apparent and could cause reliability issues later. If the amp is unreliable or fails while testing, you won't know if it's the drivers or something else.