Siemens STB 21

STB 21

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

Variants

	Part number V23758-	Colour cover/slider	Diode	Travel	Response force
	A2113-A1	Yellowish/Natural	No	4 mm	70 cN
	A2113-A5	Natural/Natural	Yes	4 mm	70 cN
	A2133-A1	Yellowish/Grey	No	2.5 mm	70 cN
	A2133-A5	Natural/Grey	Yes	2.5 mm	70 cN

Keyboards

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

Gallery

STB 21 2.5 mm

• 
  Fully disassembled, bottom views of components