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Old 12-29-2021, 05:30 PM   #1
ADF79
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Default 7 segment LED display with different pinout

Hello!

I need to replace a green 7 segment LED display that has the common anode at pins 5,6 but I've only found ones with common anode at pins 3,8 and of course I cannot fit them into the circuit.
Do you know what kind of display is this and where can I find one ?

best regards
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Old 12-29-2021, 05:41 PM   #2
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Default Re: 7 segment LED display with different pinout

It's a single digit? What size? Do you have the original part number.
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Old 12-29-2021, 05:54 PM   #3
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Default Re: 7 segment LED display with different pinout

replace or fit into unconfigured PCB holes?
Picture of device? Size/distance between rows?

All of the 0.3" single digit CA devices I've seen were standardized in pinout to that of the original MAN1 ...
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Old 12-29-2021, 06:34 PM   #4
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Default Re: 7 segment LED display with different pinout

The first 7-segment LED display MAN-1 ?
Mid-1970's I made a digital clock using 0.3" green MAN-54 I think and they were so dim and expensive. Every year they got brighter and price got lower.
Anyhow, that became a standard pinout for anything like it.

OP, check how you are numbering the pins. Missing pins are usually numbered but not always.
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Old 12-29-2021, 08:43 PM   #5
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Default Re: 7 segment LED display with different pinout

Not sure, but it was probably Monsanto's (Bayer?) first DIP14 7-segment.
HP, TI, and then even more clones end up using the same pinout for some reason, with the exception if the decimal point (left vs right), commas, and sign (for the 1 display) use different pins.
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Old 12-29-2021, 09:01 PM   #6
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Default Re: 7 segment LED display with different pinout

My old Quest SuperELF uses Fairchild FND500 series and there's the smaller FND357 - both of which have the pins along the top and bottom, that's the second style of LED display pinout that is common. These have pin 3,8 as common.
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File Type: png FND500_507 pinout.png (30.6 KB, 10 views)
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Old 12-29-2021, 10:00 PM   #7
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Default Re: 7 segment LED display with different pinout

So far I've come across three "standards" for 7-segment, the 0.2" 10-pin (pins parallel to height), the 0.3" 14-pin (pins parallel to height), and the 0.6" 10-pin (pins parallel to width).

I also see some 0.3" 10-pin and likewise is parallel to height, so there are a lot of variations. Seems the 0.2" and 0.3" 10-pin "parallel to height" may have the same pinout...
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Old 12-30-2021, 03:13 AM   #8
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Default Re: 7 segment LED display with different pinout

Yes it's a single digit, about 0.6" with 10 pins parallel to width. I can't find a part number.
The only difference is the non-standard pinout, common anode is at 5,6 instead of central pins.
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Old 12-30-2021, 01:53 PM   #9
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Default Re: 7 segment LED display with different pinout

Usual Fairchild-style, pin 5 is DP and pin 6 is B-segment, with 3,8 common.
I did see an alternate pinout, for the 10-pin (across the top and bottom) LED display.
There is common on pin 5,10 which is the opposite corners, with DP pin 4, C-segment pin 3, G-segment pin 8. Not sure where this pinout-style came from.
There's 0.56" (14.2mm) height and 0.6" (15mm) height.
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File Type: jpg LED pinout.JPG (58.0 KB, 7 views)
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Old 12-30-2021, 04:20 PM   #10
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Default Re: 7 segment LED display with different pinout

Quote:
Originally Posted by redwire View Post
Usual Fairchild-style, pin 5 is DP and pin 6 is B-segment, with 3,8 common.
I did see an alternate pinout, for the 10-pin (across the top and bottom) LED display.
There is common on pin 5,10 which is the opposite corners, with DP pin 4, C-segment pin 3, G-segment pin 8. Not sure where this pinout-style came from.
There's 0.56" (14.2mm) height and 0.6" (15mm) height.
This has exactly the same pinout on the bottom side and a little different on the top side, but I guess would be much easier to fit than the standard 7 segment pinout.
I attach a picture of the actual pinout I'm looking for. Has anyone ever seen it ?

Regards
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File Type: png pinout.png (37.8 KB, 10 views)

Last edited by ADF79; 12-30-2021 at 04:22 PM..
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Old 01-01-2022, 11:02 PM   #11
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Default Re: 7 segment LED display with different pinout

I see nothing like that, even going back to the 70's. Maybe post pics of the display.
It would be very odd to break conventions and use that nutty pinout.
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