Siemens STB 21

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STB 21
Siemens STB 21 V23758-A2133-A5 -- top.jpg
Manufacturer Siemens AG
Family Siemens STB
Product code V23758-A21n3-Annn
Introduced 1985
Discontinued late 1990s
Supersedes Siemens STB 11
Switch type Tactile
Clicky? no
Sense method Metal leaf
Rated lifetime > 10 M
Tactile force ~70 cN
Actuation force ~50 cN (start), ~100 cN (end)
Pretravel 2.0 or 1.7 ± 0.4 mm
Total travel 4.0 mm or 2.5 mm
Keycap mount RAFI mount
Switch mount PCB or plate mounted
Patents EP0158725 (1984)

Description and History

see Siemens STB


Part number
Diode Travel Response force
STB21-A2113-A1.jpg A2113-A1 Yellowish/Natural No 4 mm 70 cN
STB21-A2113-A5.jpg A2113-A5 Natural/Natural Yes 4 mm 70 cN
STB21-A2133-A1.jpg A2133-A1 Yellowish/Grey No 2.5 mm 70 cN
Siemens STB 21 V23758-A2133-A5 -- top.jpg A2133-A5 Natural/Grey Yes 2.5 mm 70 cN



STB 21 2.5 mm