Editing RAFI RS 76 C

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{{infobox dswitch
| image name        = RAFI RS 76 C -- infobox.jpg
| manufacturer      = [[RAFI]]
| product code      = 3.13.001.nnn<br>3.13001.nnn<br>3.13011.nnn
| contact mechanism = [[Hall effect]]
| switch type       = Linear,<br>latching
| actuation force   = 
| introduced        = 1976<ref name="Intro" />
| discontinued      = 
| family            = [[RAFI full-travel key switch]]
| keycap mount      = [[RAFI mount]]
| switch mount      = [[PCB mount]]
| travel            = 4 mm
| lifetime          = 100 M (momentary)<br>100 k (latching)
| website           = http://www.rafi.de/RS-76-Langhubtaster-zum-Aufbau.165.0.html
}}

[[File:Brand logo--HFO (approximation).svg|250px|thumb|HFO—VEB Halbleiterwerk Frankfurt (Oder)—logo found on the 76 C Hall IC]]

'''RAFI RS 76 C''' is a series of PCB-mount [[Hall effect]] switches in the [[RAFI full-travel key switch]] family.

==Design==
RS 76 C switches use a Hall sensor IC, actuated using a small magnet; the magnet is 2 mm wide, 3 mm tall and 1 mm deep. The magnet fits into a pocket within the slider. The IC provides the switch with four legs; an additional dummy leg is placed at the opposite end of the switch simply to help secure the switch. The momentary switches are damped on the downstroke by a rubber ring placed around the slider guide shaft; this is omitted from the illuminated and latching versions as it would partially block the holes in the base for the LEDs.

The momentary versions typically use yellow sliders, although in the 2016 catalogue they are shown with the same colourless slider as used by the illuminated and latching versions. The [[Siemens Teleperm ST215]] does indeed uses colourless sliders. An anomalous version with a cream slider is depicted below.

The RAFI Electromechanical Components 2001 catalogue provides part numbers for IP 40 and IP 65–rated switches; at present, only IP 40–rated switches are listed in RAFI catalogues. The separate part numbers for different LED colours are also no longer listed.

RS 76 C should not be confused with low-profile [[ITW magnetic valve]] switches, which are also open-top and use a very similar keycap mount.

==Variants==
The series appears to be divided as follows:

*3.13.001.nnnn — IP40
*3.13.011.nnnn — IP65

{| class="wikitable variants-table"
! !! Action !! IP rating !! Illuminated !! Terminal force !! Part number
|-
| [[File:RAFI RS 76 C 010 -- variants table.jpg|175px]] || Momentary || IP 40 || No  ||  70 cN || 3.13.001.010/0000 '''(2016)'''<br>3.13001.010 '''(2001)'''
|-
| [[File:RAFI RS 76 C 210 -- variants table.jpg|175px]] || Momentary || IP 40 || No  || 100 cN || 3.13.001.210/0000 '''(2016)'''<br>3.13001.210 '''(2001)'''
|-
| [[File:No photograph.svg|175px]]                      || Momentary || IP 65 || No  || 100 cN || 3.13011.010 '''(2001)'''
|-
| [[File:No photograph.svg|175px]]                      || Momentary || IP 65 || No  || 130 cN || 3.13011.210 '''(2001)'''
|-
| [[File:RAFI RS 76 C 110 -- variants table.jpg|175px]] || Momentary || IP 40 || Yes ||  70 cN || 3.13.001.110/0000 '''(2016)'''<br>3.13001.110/0000 '''(2001)'''
|-
| [[File:No photograph.svg|175px]]                      || Momentary || IP 65 || Yes || 110 cN || 3.13011.110/0000 '''(2001)'''
|-
| [[File:RAFI RS 76 C 130 -- variants table.jpg|175px]] || Latching  || IP 40 || Yes ||  70 cN || 3.13.001.130/0000 '''(2016)'''<br>3.13001.130/0000 '''(2001)'''
|-
| [[File:No photograph.svg|175px]]                      || Latching  || IP 65 || Yes || 110 cN || 3.13011.130/0000 '''(2001)'''
|}

The RAFI Electromechanical Components 2001 catalogue also lists the following dedicated part numbers for the illuminated versions:

{| class="wikitable"
! Action    !! IP rating !! LED colour !! Part number
|-
| Momentary || IP 40     || None       || 3.13001.110/0000
|-
| Momentary || IP 40     || Red        || 3.13001.110/1350
|-
| Momentary || IP 40     || Green      || 3.13001.110/1550
|-
| Momentary || IP 40     || Yellow     || 3.13001.110/1450
|-
| Momentary || IP 65     || None       || 3.13011.110/0000
|-
| Momentary || IP 65     || Red        || 3.13011.110/1350
|-
| Momentary || IP 65     || Green      || 3.13011.110/1550
|-
| Momentary || IP 65     || Yellow     || 3.13011.110/1450
|-
| Latching  || IP 40     || None       || 3.13001.130/0000
|-
| Latching  || IP 40     || Red        || 3.13001.130/1350
|-
| Latching  || IP 40     || Green      || 3.13001.130/1550
|-
| Latching  || IP 40     || Yellow     || 3.13001.130/1450
|-
| Latching  || IP 65     || None       || 3.13011.130/0000
|-
| Latching  || IP 65     || Red        || 3.13011.130/1350
|-
| Latching  || IP 65     || Green      || 3.13011.130/1550
|-
| Latching || IP 65      || Yellow     || 3.13011.130/1450
|}

==Keyboards==
*[[RAFI B6-C]]
*[[RAFI B8-C]]
*[[RAFI 401.002.159]]
*[[Siemens Teleperm ST215]] (white sliders)<ref name="DT-ST215" />

==Gallery==
<gallery widths=250 heights=187>
File:RAFI RS 76 C-2.jpg             | RS 76 C from the side, in an older [[RAFI B6-C]] keyboard
</gallery>

===3.13.001.010/0000===
Sample received from RAFI in 2016.

<gallery widths=250 heights=187>
File:RAFI RS 76 C 010 -- angled.jpg                           | Typical yellow RS 76 C, 70 cN version (3.13.001.010/0000)
File:RAFI RS 76 C 010 -- magnet partially removed.jpg         | Magnet partially removed from the slider
File:RAFI RS 76 C 010 -- redundant leg.jpg                    | Redundant leg, held between a ramp and retaining steps
File:RAFI RS 76 C 010 -- fully disassembled, top views.jpg    | Fully disassembled, top views
File:RAFI RS 76 C 010 -- fully disassembled, bottom views.jpg | Fully disassembled, bottom views
</gallery>

===3.13.001.210/0000===
Sample received from RAFI in 2016. This is identical to 010 except for having a heavier spring:

<gallery widths=250 heights=187>
File:RAFI RS 76 C -- spring comparison.jpg | Spring comparison, 010 vs 210
</gallery>

===Anomalous cream version===
<gallery widths=250 heights=187>
File:RAFI-RS76C-assembled.jpg       | Anomalous cream RS 76 C switch
File:RAFI-RS76C-bottom.jpg          | Bottom side of the switch; IC legs on the left hand side
File:RAFI-RS76C-disassembled.jpg    | Disassembled switch; the red line on the IC marks the border between the rest position and the activated position.
File:RAFI-RS76C-slider.jpg          | The RS 76 C slider has an extension with a pocket for the magnet. 
</gallery>

==References==
<references>
<ref name="Intro">Electronic Design '''25''' (1976), Nr. 22, p. 102: ''A new switching technique for keyboard system RS 76 uses a Hall-effect IC to ensure that switching is bouncefree and reliable.''</ref>
<ref name="DT-ST215">Deskthority — [http://deskthority.net/photos-videos-f8/siemens-teleperm-st215-t7710.html Siemens Teleperm ST215]</ref>
</references>

[[Category:RAFI switches]]
[[Category:Hall effect switches]]
[[Category:Keyboard switches with a RAFI mount]]
[[Category:Alternate action switches]]
[[Category:Linear switches]]
[[Category:Damped switches]]
[[Category:Production switches]]
[[Category:List of all keyboard switches]]