Editing Siemens STB 21

{{infobox dswitch
| image name        = Siemens STB 21 V23758-A2133-A5 -- top.jpg
| name              = STB 21
| manufacturer      = [[Siemens AG]]
| family            = [[Siemens STB]]
| product code      = V23758-A21n3-Annn
| introduced        = 1985
| discontinued      = late 1990s
| switch type       = Tactile
| clicky            = no
| contact mechanism = [[Contact mechanism#Metal leaf|Metal leaf]]
| lifetime          = > 10 M
| actuation force   = ~50 cN (start), ~100 cN (end)
| tactile force     = ~70 cN
| pretravel         = 2.0 or 1.7 ± 0.4 mm
| travel            = 4.0 mm or 2.5 mm
| keycap mount      = [[RAFI mount]]
| switch mount      = [[PCB mount|PCB]] or [[plate mount|plate mounted]]
| patents           = [http://www.google.com/patents/EP0158725 EP0158725] (1984)
| supersedes        = [[Siemens STB 11]]
}}

==Description and History ==
see [[Siemens STB]]

==Variants==
{| class="wikitable variants-table"
|-
! !! Part number<br />V23758- !! Colour<br />cover/slider !! Diode !! Travel !! Response force
|-
| [[File:STB21-A2113-A1.jpg|175px]]                        || A2113-A1 || Yellowish/Natural || No  || 4 mm   || 70 cN
|-
| [[File:STB21-A2113-A5.jpg|175px]]                        || A2113-A5 || Natural/Natural   || Yes || 4 mm   || 70 cN
|-
| [[File:STB21-A2133-A1.jpg|175px]]                        || A2133-A1 || Yellowish/Grey    || No  || 2.5 mm || 70 cN
|-
| [[File:Siemens STB 21 V23758-A2133-A5 -- top.jpg|175px]] || A2133-A5 || Natural/Grey      || Yes || 2.5 mm || 70 cN
|-
|}

==Keyboards==
* [[Siemens AG]]
** Terminals 97801-101, T 4200
** Programmers [[Siemens PG 635|PG 635]], [[Siemens PG 685|PG 685]], [[Siemens PG 710/730|PG 710/730]], [[Siemens PG 750/770|PG 750/770]]
** BTX client T 3310-2
** Teleprinter [[Siemens TA-BS/1200|TA-BS/1200]]
* [[Tandberg|Tandberg Data]] (Tandberg Display):
** [[Tandberg Data TDV 2200 Series|TDV 2200]] (late revisions)
** TDV 1200 (late versions) 
** [[Tandberg Data TDV 5000 Series|TDV 5000]]
** [[Tandberg Data TDV 5000 Series|TDV 5010]] (1st generation)
** [[Tandberg Data TDV 5000 Series|TDV 5020]]
* [[Tiki 100]] microcomputer of Tiki Data (unconfirmed, maybe some of them)

==Gallery==
===STB 21 2.5 mm===
<gallery widths=250 heights=187>
File:Siemens STB 21 V23758-A2133-A5 -- disassembled, bottom views.jpg | Fully disassembled, bottom views of components
</gallery>


[[Category:Siemens switches]]
[[Category:Keyboard switches with a RAFI mount]]
[[Category:Tactile switches]]
[[Category:Metal contact switches]]
[[Category:List of all keyboard switches]]