3 Sep
2015
3 Sep
'15
3:31 p.m.
Hi Simon,
As others have implied, the DEC8235 is a Signetics 8235N. It's available
from obsolete part distributors. A quick search turns
up this source:
http://www.4starelectronics.com/part_detail/8235N.html
While the RFQ instead of a price is bad news in some places, I've had
good results with that in the obsolete parts arena.
is there a list of equivalents for DEC ic's?
--- Thought I had a longer list somewhere but this short list is what I
find at the moment:
DEC# Generic
----------------------
97401 7401
8881 7439* Quad 2-inp NAND OC
8266 8266 Signetics 2-inp 4-bit wide mux
8270 8270 Signetics may = TI 74178 according to posts in cctech.
8271 8271 Signetics 4-bit SR in 16p pkg = TI 74179
8251 N8251N Signetics BCD/decimal decoder in 16p pkg
5380 SP380 Signetics
5314A SP314A Signetics
8640 DS8640 National
380 (?) SP384A Signetics Quad 2-in OR gate
*Note that some DEC8881s have been reported as having 7439 markings on
the bottom.
Steve Lafferty
3 Sep
3 Sep
3:37 p.m.
Dear Wayne,
If anything comes up from Nemonix let me know and I will see what I can do. Since I work
for neither company I can volunteer some time for Nemonix as well.
I am going to post the link to the Nemonix DSSI link.
Sue
On Sep 3, 2015, at 3:31 PM, Stephen Lafferty <steve
at tronola.com> wrote:
Hi Simon,
As others have implied, the DEC8235 is a Signetics 8235N. It's available from
obsolete part distributors. A quick search turns up this source:
http://www.4starelectronics.com/part_detail/8235N.html
While the RFQ instead of a price is bad news in some places, I've had good results
with that in the obsolete parts arena.
Sue Skonetski
VP of Customer Advocacy
Sue.Skonetski at vmssoftware.com
Office: +1 (978) 451-0116
Mobile: +1 (603) 494-9886
Mit freundlichen Gr??en ? Avec mes meilleures salutations
is there a list of equivalents for DEC ic's?
--- Thought I had a longer list somewhere but this short list is what I find at the
moment:
DEC# Generic
----------------------
97401 7401
8881 7439* Quad 2-inp NAND OC
8266 8266 Signetics 2-inp 4-bit wide mux
8270 8270 Signetics may = TI 74178 according to posts in cctech.
8271 8271 Signetics 4-bit SR in 16p pkg = TI 74179
8251 N8251N Signetics BCD/decimal decoder in 16p pkg
5380 SP380 Signetics
5314A SP314A Signetics
8640 DS8640 National
380 (?) SP384A Signetics Quad 2-in OR gate
*Note that some DEC8881s have been reported as having 7439 markings on the bottom.
Steve Lafferty
6:52 p.m.
On 03/09/2015 20:31, Stephen Lafferty wrote:
--- Thought I had a longer list somewhere but this
short list is what I
find at the moment:
I think you'll find a 380 and a 384 are not the same :-) But the 8270/8271
substitutions by 74178/74179 seem to match and are good to know.
A leading additional 5 or 9 means DEC selected examples of devices, eg
97401/7401, 380/5380, etc against some particular criteria, such as
leakage, or drive current.
Here's a list I found some time ago (most of the comments are not mine,
and I'm sorry I've lost the attribution, but I've updated it slightly):
DEC component cross reference / substitutions
DEC EIE
D-003, D003 1N994
D-662, D662 1N645
D-664, D664 1N3606
D-668, D668 Two 1N3606 in series
D-670, D670 1N3653
D-671, D671 1N3653
D-672, D672 1N3653
DEC 999, DEC999 MM999
DEC 1008, DEC1008 MM1008
DEC 2219, DEC2219 2N2219
2N2904 2N2118A
DEC 2904, DEC2904 2N1132
DEC 3009, DEC3009 2N3009
DEC 3009A, DEC3009A 2N3009
DEC 3009B, DEC3009B 2N3009
DEC 3500, DEC3500 2N3500
DEC 3568, DEC3568 2N3568
DEC 3634, DEC3634 2N3634
DEC 3638, DEC3638 2N3638
DEC 3639, DEC3639 2N3639
DEC 3639B, DEC3639B 2N3639
DEC 3639-2, DEC3639-2 2N3639-2
DEC 3715, DEC3715 2N3715
DEC 3790, DEC3790 2N3790
DEC 4258, DEC4258 2N4258
DEC 6531, DEC6531 MPS6531
DEC 6534, DEC6534 MPS6534
SDA-6, SDA6 2N2060
1N429 1N429 6.2V 5%
1N449 1N449 6.2V 5%
1N762 1N762 5.5V 250 ohms 5%
1/4M6.8AZ5 1N4099
1/4M2.4VAZ5 1N4370
MR2064 1N4001
MR2066 1N4003
U6A900959X 7440
MPSA05 GPSA05 (Pinout reversed)
MPSA55 GPSA55 (Pinout reversed)
Connector
1209456 AMP 61320-1
1209340 Tyco/AMP 1-480459-0
From PDP-8 maintenance manual 10-5 and RK05 prints.
Also I have found the following parts to be similar but this is not from
DEC documentation so check your particular part.
DEC 82xx is Signetics 82xx series
DEC 5xxx is Signetics SPxxx
DEC 88xx is National DS88xx series or also I think Signetics 8Txx series
DEC 97401 is also labeled a SN7401, was a selected version of that part
for low leakage current.
DEC 314, DEC314 SP314A
DEC 380, DEC380 SP380A, also DS8640 is similar
DEC 384, DEC384 SP384A
DEC 8881, DEC8881 SN7401 has same pinout but less drive, SN7439
has the drive and same pinout.
For R series repairs B Klatt said:
I've successfully used 1N4148-type diodes and 2N3904 (NPN) and
2N3906 (PNP) as general purpose substitutes in the few R-series
repairs I've made. The MPSA05 and MPSA55 were popular with
DEC designers and are still readily available.
--
Pete
Pete Turnbull
3250
days inactive
3250
days old
2 comments
3 participants
participants (3)
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pete＠dunnington.plus.com -
steve＠tronola.com -
Sue.Skonetski＠VMSSoftware.com