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Cherry M9 part number schema

This page summarises the Cherry M9 part number schema. See common schema for a more detailed look at the Cherry part number schema.

Sources:

Cherry note that not all options presented in the part number schema were necessarily manufactured.

1: Keymodule

Value Meaning
M Keymodule

2: Series

Value Meaning
9 Cherry M9

3: Contact design

Value Design Material Rating
2 Triangular AgPd 30 (70% silver, 30% palladium) 100 mA/60 V
3 Triangular Au 69 Ag 25 Pt 6 (69% gold, 25% silver, 6% platinum) 100 mA/28 V
4 Round AuAg 10, 3 µm (90% gold, 10% silver) 10 mA maximum/12 V maximum

4: Switch characteristics

Value Meaning
A SPST NO
B SPST NC
C DPST NO
D DPST NO/NC break before make (suitable for wiring as SPCO)
E Double action (described as “1 N.O + 1 N.O overtravel”)
F Dummy
G Special

5: Force and behaviour

Value Action Poles Force Notes
0 Special
1 Momentary Single 70 cN
2 Double Double 120±30 cN (stage 1), 500±100 cN (stage 2) (1982 catalogue)
85 cN (stage 1), 400 cN (stage 2) (1985 schema)
3 Momentary Double 120 cN
4 Momentary Single 120 cN Space bar
5 Alternate Single 82 cN Keystems 1 and 2 only

6: Keystem

Note that these terms are not fully understood.

Value 1982 catalogue 1985 schema
1 12 mm, 0° CM Standard, straight
2 12 mm, 10° CM Standard, 10°
3 Absent TA, 10°
4 Absent Straight, short, TA
5 Absent Straight, long, TA/L-T
6 Absent Lowpro-keycap, TA
7 6 mm, 0° Lowpro-keycap, CM Standard
8 Absent Lowpro-keycap, TA 7°
9 6 mm, 7° Absent
A–Z Not specified Special

7: Standard features

Value Meaning
N No LED
R Red LED
G Green LED
Y Yellow LED
Z LED shell with no LED fitted

8: Additional characteristics

Value Fixing pins Movable contact terminal Stationary contact terminal Notes
N No pins Silver-plated Silver-plated
W With pins Silver-plated Silver-plated
B No pins Bare Silver-plated
M With pins Bare Bare L49 M94 only
I No pins Bare Bare L49 M94 only
L No pins Silver-plated Bare L49

Note that L49 is a copper-nickel-tin alloy, with composition CuNi9Sn2 (89% copper, 9% nickel and 2% tin by weight). L49 appears to be a manufacturer-specific designation from German supplier Wieland.