NTE2320 CROSS? (Any IC w/ 2NPN & 2 PNP)

On 8 Oct 2005 08:11:26 -0700, snipped-for-privacy@fullnet.com put finger to keyboard and composed:

MPQ6501 MPQ6502 MPQ6700 TPQ6501 TPQ6501A TPQ6502 TPQ6502A

-- Franc Zabkar

Please remove one 'i' from my address when replying by email.

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Thanks, Franc Zabkar!

It looks like the MPQ6501, MPQ6502, and MPQ6002 are in 14-DIP (TO-116) packages, with the same pinouts as the NTE2320. The MPQ6700 appears to be a surface-mount part.

And it looks like the specs of the MPQ6502 and the MPQ6002 match those of the NTE2320, basically exactly. Apparently, they each contain two

Unfortunately, neither Mouser.com nor Digikey.com stocks the MPQ6502 or MPQ6002.

I'll do some searches and report back with any sources I find, for the sake of the archive. In the meantime, if anyone already knows of any sources, please post the information.

(P.S. I didn't yet find any info about the TPQ parts that were mentioned.)

Regards,

Tom Gootee

tomg AT fullnet.com

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On 10 Oct 2005 12:47:33 -0700, snipped-for-privacy@fullnet.com put finger to keyboard and composed:

It may have been available in DIP form also.

Check NTE's onsite xref:

If you like I can post Sprague's TPQ datasheets on my web space. The package styles are all DIP14.

Otherwise here are some basic specs:

My Sprague databook indicates that TPQ6600 and TPQ6600A also came in the same package and PNP/NPN layout. There is also a cross reference to identically numbered MPQ Motorola parts, but no other second source is listed for these.

FWIW, according to

-- Franc Zabkar

Please remove one 'i' from my address when replying by email.

Thanks, Franc!

I did find the Sprague datasheets, for the TPQ65xx parts. I can't remember WHERE; maybe through the allegromicro.com website. But thanks for offering.

And I think that TI was also mentioned as a manufacturer of the TPQ parts.

The MPQ6700 is in stock at

By the way, I think that I was wrong about the pinout of the MPQ6002. It's slightly different than the others, if I recall correctly.

At any rate, I now need to find a source of supply, for something like the MPQ6502. I have found them, from various suppliers of obsolete ICs, on the web. But I haven't quite been able to find out, yet, if any equivalent through-hole IC is still being manufactured (besides the NTE2320).

Any additional info, or sources, would be greatly appreciated.

Regards,

Tom Gootee

On 11 Oct 2005 10:05:50 -0700, snipped-for-privacy@fullnet.com put finger to keyboard and composed:

I notice that Fairchild have an smt version, MMPQ6700. It is a 16-pin device.

Is there any reason why you don't just use discrete transistors? Is it for manufacturing reasons? If it's for matching purposes, then AFAICT the devices in these arrays are not matched any better than discretes from the same batch.

Yes, you're right.

The MPQ7053 may also be suitable. Central Semi

Try emailing them at salesinquiry at centralsemi dot com.

This is their search engine:

More data:

Motorola also manufactured the MPQ7051 and MPQ7052 NPN/PNP quad arrays, but I don't have the pinouts for those.

-- Franc Zabkar

Please remove one 'i' from my address when replying by email.

Franc,

Thanks for all of the additional info! Sorry it took me so long to respond. I've been away.

The main reason that I want to use an IC transistor array is so that the thermal variations are more-closely matched. But I was also under the impression that the transistors would be matched better than discrete ones. Maybe I should also look at things like the LM394.

Thanks again! You have been so very helpful. I truly appreciate it.

Regards,

Tom Gootee

Update:

Brett Singer of Central Semi has been kind enough to send me free samples (4 each) of the MPQ6502 quad array (2 NPN + 2 PNP in DIP14 case), and also the 2N3811A, 2N3811, 2N3810A, and 2N3810 dual PNP parts (TO-78 cans). [The "A" versions of the duals are spec'ed for matching to within 1.5 mV Vbe and 5% hfe. And the non-A versions are spec'ed to within 3 mV Vbe and 10% hfe.]

I'll let you know how they work out.

Regards,

Tom Gootee