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.
Contents
Sources
Cherry note that not all options presented in the part number schema were necessarily manufactured.
Positions
1: Keymodule
| Value |
Meaning |
| M | Keymodule |
2: Series
| Value |
Meaning |
| 9 | Cherry M9 |
| Value |
Design |
Material |
Rating |
| 1 |
|
Not documented |
Not documented |
| 2 |
 |
AgPd 30 (70% silver, 30% palladium) |
100 mA/60 V |
| 3 |
|
Au 69 Ag 25 Pt 6 (69% gold, 25% silver, 6% platinum) |
100 mA/28 V |
| 4 |
 |
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 |
| 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 is a manufacturer-specific designation from German supplier Wieland.
See also