pnp and npn quad transistor array  - Page 1
Forum section: electronics / general

author: peterthenovice
author_rank: Regular Contributor
timestamp: March 11, 2013, 10:54:27 pm
content: I am looking for a ic that has two npn trasistors and two pnp trasistors

author: c4757p
author_rank: Super Contributor
timestamp: March 11, 2013, 10:59:38 pm
content: Just go to Mouser or DigiKey and search - this is an easy one and it's good to get used to the search tools. At Mouser, go to "Transistors Bipolar - BJT" and you can search for arrays by choosing "quad" as the configuration. They're a bit scarce - Mouser has just three NPN/PNP arrays in stock.

author: peterthenovice
author_rank: Regular Contributor
timestamp: March 11, 2013, 11:24:54 pm
content: I found a quad package on ebay from china that is 5$ plus 1 cent for each additional chip.

author: c4757p
author_rank: Super Contributor
timestamp: March 11, 2013, 11:27:40 pm
content: Be careful that there is nothing wrong with it.

author: mariush
author_rank: Super Contributor
timestamp: March 12, 2013, 12:59:11 am
content: DIP:http://uk.farnell.com/that-corporation/that340p14-u/transistor-array-dip14-340/dp/1354180SOIC:http://uk.farnell.com/that-corporation/that340s14-u/transistor-array-smd-so-14-340/dp/1354179More expensive but no tricks with shipping fees like you get on eBay, and some guarantee they're original.But I'd say consider getting two npn+pnp chips, they're more readily available, cheaper, and potentially take up less board space and they're super cheap : uk.farnell.com/nxp/pumd13/transistor-digital-dual-sot-363/dp/8738327RL

author: amspire
author_rank: Super Contributor
timestamp: March 12, 2013, 02:58:00 am
content: Quote from: mariush on March 12, 2013, 12:59:11 amThis is no good at all if you need a matched NPN pair and a matched PNP pair for current mirrors, differential amps, multipliers, log-antilog circuits, etc. If you don't need matched pairs, you can just use cheap single transistors anyway.It traditionally was hard to get good NPN transistors and good PNP transistors on the same die so that is why arrays like the CA3046 with only NPN transistors were common. The PNP transistors often used to end up as slower lateral transistors with poor gain and bandwidth.I have never heard of the THAT340P14-U mentioned above, but it looks like the THAT corp has done a good job with 300MHz+ NPN and PNP transistors, and a typical offset of 0.5mV for both.

author: peterthenovice
author_rank: Regular Contributor
timestamp: March 12, 2013, 03:56:14 am
content: I was going to use the chip package on a bread board for experimenting with pnp & npn transistors. what would be the best way to do this. should a use single transistor packages.

author: c4757p
author_rank: Super Contributor
timestamp: March 12, 2013, 03:57:31 am
content: Just "experimenting with transistors"? A pile of five-cent PNP and NPN transistors would probably be the best way to do that. I recommend PN2222 and PN2907.

author: peterthenovice
author_rank: Regular Contributor
timestamp: March 12, 2013, 04:01:45 am
content: thanks for the advice.

author: casinada
author_rank: Frequent Contributor
timestamp: March 12, 2013, 04:18:15 am
content: 2N3904/2N3906BC547/BC557You can find them very cheap. Buy them in 25, 50, or even in 100 for less than $10The ones in Dip packaging, if you ruin one you might ruin the other as well or you'll have to remember which one is bad.

author: SeanB
author_rank: Super Contributor
timestamp: March 12, 2013, 04:58:57 am
content: MPQ6502. 2 NPN and 2 PNP in a DIL package.

author: peterthenovice
author_rank: Regular Contributor
timestamp: March 12, 2013, 05:08:01 am
content: I think a will get a 100 transistors for about 6$ on ebay. It may take a while but it will be well worth it. maybe 2n2222 transistors

author: c4757p
author_rank: Super Contributor
timestamp: March 12, 2013, 05:11:44 am
content: You'll pay the same on Mouser and you will know they are good. And don't forget the PNP.

author: amyk
author_rank: Super Contributor
timestamp: March 12, 2013, 06:45:36 am
content: Quote from: peterthenovice on March 12, 2013, 03:56:14 amAnd this is why it's always a good idea to tell us your application before just asking about a specific part.