D34L30-A ICs - what are they? - UK Vintage Radio Repair and Restoration Discussion Forum

mole42uk · 6th Aug 2017, 3:25 pm

I have discovered some new D34L30-A ICs in my store today but I have no idea what they are. There are some D3230A chips as well.

Can anyone identify them?

Thanks

pbengtech · 9th Aug 2017, 8:24 am

None of my equivalent books are any help, could you please post a picture of them?
I need to see the number of pins and the manufacturers logo...
Thanks,
Phil

Sideband · 9th Aug 2017, 1:02 pm

They may be 'in-house' numbers....in other words, standard IC's but re-numbered by a manufacturer. Thorn did this a lot. If we know the manufacturers logo, it might be possible to track down an equivalent.

mole42uk · 9th Aug 2017, 5:45 pm

Here is a photo of the mysterious beasts....

AC/HL · 9th Aug 2017, 8:45 pm

The two top right are Motorola. They all appear to be ceramic packages, so better quality parts.

Radio Wrangler · 9th Aug 2017, 10:03 pm

The Motorola ones also have Motorola's usual typefont. For some reason the lower row make me think of Natsemi or SGS

David

mole42uk · 10th Aug 2017, 6:09 am

There's a little voice in the recesses of my head says RAM, possibly each chip is 1x8k. That might fit with my old NASCOM II but.
I've just remembered that the file of 80-BUS paperwork isn't too deeply buried, I'll have a look in there.
There's some TTL on the foam pad as well, so I might have been gathering parts for a memory board.

Skywave · 10th Aug 2017, 9:05 pm

A quick perusal around the 'Net revealed that the D3430A was manufactured by Texas; the D34L30A manufactured by Ferranti. Noting found for the D3230A.

One wild thought did cross my mind: if in "D3430A" we replace the "D3" by "7", we get 7430A: TTL chip. "D" is the fourth letter of the alphabet and "3" is . . . 3. Now 4 + 3 = 7. Hmm.

Just a one-off, inspired & a totally bizarre thought . . . . .

Al.

Bill · 10th Aug 2017, 9:57 pm

The lower ones are Ferranti low power CDI(Collector Diffused Isolation) versions of TTL=7430. Pretty sure from the date codes, 1975,1976 that they were destined for "Post Office" System X phone exchange equipment. A couple of years earlier we were making thousands of these and similar for this contract. There was a further stage in production when the devices got a "Conformal Coating" of varnish on the package. Skywave Al is on the right track. Edit to add , I see the varnish is already on , the blue stuff.

mole42uk · 11th Aug 2017, 6:18 am

Thanks Bill, it's good to know what they are. I'm not sure where I got them from, I remember going for an interview at Ferranti in Manchester around 1971 but I wouldn't have gained some unusual parts as a reward!

Skywave · 11th Aug 2017, 4:54 pm

Following my post #8 and the remark made by Bill in post #9, I just wonder if the D3230A might be Motorola's version of an SN5430.
Perhaps the D prefix in D3430A and D3230A simply signifies 'digital'?

Moreover, is my 'signature' below applicable to all of these mutterings of mine?

Al.

mole42uk · 11th Aug 2017, 5:48 pm

So, does anyone know of a System X preservation society that could use them? The only PO people I know are the ones that run the uniselector exchange at Avoncroft.

11th Aug 2017, 6:26 pm

You could pop the lid off one of the ceramic ones (large sidecutters applied to the join) and have a look at the chip.

Bill · 11th Aug 2017, 8:36 pm

Quote:

Originally Posted by merlinmaxwell

You could pop the lid off one of the ceramic ones (large sidecutters applied to the join) and have a look at the chip.

Yes, I may have signed it

We've already established the identity so it seems a bit destructive just to see a bit of modified sand.
The ceramic packages "Cerdips" were a lot more expensive to produce than the plastic DILs.
IIRC the 54 range of TTL had a wider operating temperature range than 74 so was more expensive. We were making tons of "normal" TTL just after those blokes landed on the moon in 1969, not sure if there was a connection there.
Bill

6th Aug 2017, 3:25 pm	#1
mole42uk Nonode Join Date: Aug 2010 Location: Resolven, Wales; and Bristol, England Posts: 2,608	D34L30-A ICs - what are they? I have discovered some new D34L30-A ICs in my store today but I have no idea what they are. There are some D3230A chips as well. Can anyone identify them? Thanks __________________ Richard Index: recursive loop: see recursive loop

9th Aug 2017, 8:24 am	#2
pbengtech Pentode Join Date: Jan 2009 Location: Birmingham, West Midlands, UK. Posts: 234	Re: D34L30-A ICs - what are they? None of my equivalent books are any help, could you please post a picture of them? I need to see the number of pins and the manufacturers logo... Thanks, Phil

9th Aug 2017, 1:02 pm	#3
Sideband Dekatron Join Date: Oct 2003 Location: Croydon, Surrey, UK. Posts: 7,567	Re: D34L30-A ICs - what are they? They may be 'in-house' numbers....in other words, standard IC's but re-numbered by a manufacturer. Thorn did this a lot. If we know the manufacturers logo, it might be possible to track down an equivalent. __________________ There are lots of brilliant keyboard players and then there is Rick Wakeman.....

9th Aug 2017, 5:45 pm	#4
mole42uk Nonode Join Date: Aug 2010 Location: Resolven, Wales; and Bristol, England Posts: 2,608	Re: D34L30-A ICs - what are they? Here is a photo of the mysterious beasts.... Attached Thumbnails __________________ Richard Index: recursive loop: see recursive loop

9th Aug 2017, 8:45 pm	#5
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: D34L30-A ICs - what are they? The two top right are Motorola. They all appear to be ceramic packages, so better quality parts.

9th Aug 2017, 10:03 pm	#6
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,858	Re: D34L30-A ICs - what are they? The Motorola ones also have Motorola's usual typefont. For some reason the lower row make me think of Natsemi or SGS David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done

10th Aug 2017, 6:09 am	#7
mole42uk Nonode Join Date: Aug 2010 Location: Resolven, Wales; and Bristol, England Posts: 2,608	Re: D34L30-A ICs - what are they? There's a little voice in the recesses of my head says RAM, possibly each chip is 1x8k. That might fit with my old NASCOM II but. I've just remembered that the file of 80-BUS paperwork isn't too deeply buried, I'll have a look in there. There's some TTL on the foam pad as well, so I might have been gathering parts for a memory board. __________________ Richard Index: recursive loop: see recursive loop

10th Aug 2017, 9:05 pm	#8
Skywave Rest in Peace Join Date: Jun 2006 Location: Chard, South Somerset, UK. Posts: 7,457	Re: D34L30-A ICs - what are they? A quick perusal around the 'Net revealed that the D3430A was manufactured by Texas; the D34L30A manufactured by Ferranti. Noting found for the D3230A. One wild thought did cross my mind: if in "D3430A" we replace the "D3" by "7", we get 7430A: TTL chip. "D" is the fourth letter of the alphabet and "3" is . . . 3. Now 4 + 3 = 7. Hmm. Just a one-off, inspired & a totally bizarre thought . . . . . Al. Last edited by Skywave; 10th Aug 2017 at 9:12 pm.

10th Aug 2017, 9:57 pm	#9
Bill Pentode Join Date: Dec 2005 Location: Denton, Manchester, UK. Posts: 187	Re: D34L30-A ICs - what are they? The lower ones are Ferranti low power CDI(Collector Diffused Isolation) versions of TTL=7430. Pretty sure from the date codes, 1975,1976 that they were destined for "Post Office" System X phone exchange equipment. A couple of years earlier we were making thousands of these and similar for this contract. There was a further stage in production when the devices got a "Conformal Coating" of varnish on the package. Skywave Al is on the right track. Edit to add , I see the varnish is already on , the blue stuff. Last edited by Bill; 10th Aug 2017 at 10:03 pm.

11th Aug 2017, 6:18 am	#10
mole42uk Nonode Join Date: Aug 2010 Location: Resolven, Wales; and Bristol, England Posts: 2,608	Re: D34L30-A ICs - what are they? Thanks Bill, it's good to know what they are. I'm not sure where I got them from, I remember going for an interview at Ferranti in Manchester around 1971 but I wouldn't have gained some unusual parts as a reward! __________________ Richard Index: recursive loop: see recursive loop

11th Aug 2017, 4:54 pm	#11
Skywave Rest in Peace Join Date: Jun 2006 Location: Chard, South Somerset, UK. Posts: 7,457	Re: D34L30-A ICs - what are they? Following my post #8 and the remark made by Bill in post #9, I just wonder if the D3230A might be Motorola's version of an SN5430. Perhaps the D prefix in D3430A and D3230A simply signifies 'digital'? Moreover, is my 'signature' below applicable to all of these mutterings of mine? Al.

11th Aug 2017, 5:48 pm	#12
mole42uk Nonode Join Date: Aug 2010 Location: Resolven, Wales; and Bristol, England Posts: 2,608	Re: D34L30-A ICs - what are they? So, does anyone know of a System X preservation society that could use them? The only PO people I know are the ones that run the uniselector exchange at Avoncroft. __________________ Richard Index: recursive loop: see recursive loop

11th Aug 2017, 6:26 pm	#13
Guest Guest Posts: n/a	Re: D34L30-A ICs - what are they? You could pop the lid off one of the ceramic ones (large sidecutters applied to the join) and have a look at the chip.