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Keyboard–switch database Omron B3G-S


Manufacturer Omron

Created by Daniel on 2015-11-01


B3G-S “flat”: 1 1
B3G-S Click Amber: 1 1 2
B3G-S Click White: 1 1
B3G-S Linear White: 1
B3G-S Linear Amber Heavy: 1
B3G-S Linear Amber: 1
B3G-S Linear White LED: 1
Total: 1 1 2 1 1
Year: 1985 1986 1987 1988 1989 1990 1991 1992 1993

Warning: Please note that the timeline must not be trusted until a statistically significant number of data points are present.


Switch Variants Part number Type Usage
B3G-S Click Amber Japan removed; no LED recess 4
B3G-S Click White Japan removed; no LED recess 2
B3G-S Linear Amber Japan; blind LED recess 1
B3G-S Linear Amber Heavy Japan; blind LED recess 1
B3G-S Linear White Japan; no LED recess 1
B3G-S Linear White LED Japan 1
B3G-S “flat” 2


Model Year(s) Switches Serial PCB codes Reference Notes
Sony M35 keyboard 1985 (IC) Omron vase spring typical
Omron B3G-S “flat” (function row)
2432094-9, B5Y-C073-401 deskthority.net This is another of those really complicated examples. This is actually two keyboards: a plate-mounted B3G-S keyboard for just the function keys (containing all the logic circuitry), plus a vase spring membrane keyboard with its own PCB for the remainder of the keyboard, each with separate part numbers! (The B5G part number is for the controller/B3G PCB, and the B5Y part number is for the vase spring PCB.)
Sony SMC-3000G keyboard 1987 (IC) Omron B3G-S “flat” B5GS-R114-534, 0127370-6B park8.wakwak.com Additional PCB codes:

Costar CSK-1101P 1988 (IC) Omron B3G-S Click Amber (un-Japan; R:N)
Omron B3G-S Click White (un-Japan; R:N) (space bar)
Alps SKCL Compact (function row)
89006191 CSK-1101P VER 1.7 deskthority.net Another component has a 1989 date, which matches the serial number.
ADDS 2020 1987 (IC)
1988 (case)
Omron B3G-S Linear White (Japan; R:N)
Omron B3G-S Linear Amber Heavy (Japan; R:B) (space bar)
Omron B3G-S Linear Amber (Japan; R:B) (enter)
Omron B3G-S Linear White LED (Japan) (lock)
W056644 355-15000, 0273247-0B kbd.rzw.jp Additional labels on the PCB read:
35515014FPN and 06Y7SA32006
SIC 101A8 1989 (IC) Omron B3G-S Click Amber (un-Japan; R:N)
Omron B3G-S Click White (un-Japan; R:N) (space bar)
B5GS-R101-620, 0292414-0A kbtalking.cool3c.com White clicky B3G-S used also for the enter key.

PCB code 3: TW2147

The smaller chips are marked 941405, which for Mitsubishi indicates a year ending 9. This cannot be 1979 and is unlikely to be 1999, so 1989 is presently assumed. That would make the controller IC two years older if it really is from 1987
Great Wall KBD5 1993 (IC) Yantai B3G-S clone yellow
Omron B3G-S Click Amber (un-Japan; R:N) (space bar)
Omron B3G-S Click Amber (un-Japan; R:N) (enter)
www.pcwaishe.cn FCC ID JO6RA-1D was issued in 1992 to Yantai Computer Corporation of China as their only ID; this matches “RA-1D” written on the PCB