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Voltage reference diode used in Commodore and Amiga equipment

IC numbers

LM385B, AD589, TL431

IC function

Voltage reference diode

Component documentation

IC number	Manufacturer	Documentation
LM385B	Motorola (now ON Semiconductor)	Web page, Datasheet (PDF)
AD589	Analog Devices	Web page, Datasheet (PDF)
TL431	Motorola (now ON Semiconductor)	Web page, Datasheet (PDF)

Component versions

IC number	Package	Voltage	CBM part number	CBM part description
LM385B-1.2, AD589JR	8-pin SO	1.2V	391421-01	Voltage Reference, 1.2V, SO-8
TL431	8-pin DIP	ajustable	390324-01	TL431
TL431	8-pin SO	ajustable	391205-01	TL431 (SO8)	TL431CD available from: Conrad Electronic TL431ACD available from: Conrad Electronic TL431ACD available from: Conrad Electronic TL431AID available from: Conrad Electronic TL431AID available from: Conrad Electronic

Positions

Device	Position	Component	Voltage	Package
A1200	D215	LM385B, AD589JR	1.2V	SO
A4000	D507		1.2V	SO
A4000T	U470	LM385B	1.2V	SO
CD³²	D215	AD589JR	1.2V	SO
PC40-III	U117	TL431	ajustable	DIP
PC60-III	U133	TL431	ajustable	DIP
SL286/SL386SX main board	U514	TL431	ajustable	SO

Pinout LM385B, AD589

Pin	Function
1..3	N/C
4	Anode (negative)
5..7	N/C
8	Cathode (positive)

Pinout TL431 DIP package

Pin	Function
1	Cathode (positive)
2..5	N/C
6	Anode (negative)
7	N/C
8	Reference

Pinout TL431 SO package

Pin	Function
1	Cathode (positive)
2..3	Anode (negative)
4..5	N/C
6..7	Anode (negative)
8	Reference

Copyright © 2004-2010 Ronald van Dijk - All rights reserved
Last update: 8 August 2010