RS 76 full-travel keyswitches
General data
The RS 76 full-travel keyswitches are designed for configuring keyboards. They offer very comfortable operation with an
overall height of 15.5 / 15.9 mm and a key travel of 4 mm.
The modular system with a grid of 3/4“ = 19.05 mm enables you to design any key block you may want.
Mechanical
contact system RS 76 M
A gold alloy is used as the contact material and provides high contact reliability, low contact resistance and short
bouncing time.
Solid-state contact system RS 76 C
The solid-state switch in Hall-IC technology ensures bounce-free and wear-free switching and a long operating life.
Function: When pressing the keys, a permanent magnet changes its position relative to the Hall-IC and thereby generates
an output signal.
Their use is especially recommended in hostile environments and for heavy duty applications.
Content
RS 76 M full-travel keyswitch, non-illuminated
RS 76 M keyswitch, non-illuminated
RS 76 M keyswitch with diode, non-illuminated
RS 76 M keyswitch, illuminated
RS 76 M keyswitch, illuminated, momentary
RS 76 M keyswitch, illuminated, latching
RS 76 MX keyswitch, fully illuminated
RS 76 C keyswitch, non-illuminated
RS 76 C keyswitch, non-illuminated
RS 76 C keyswitch, illuminated
RS 76 C keyswitch, illuminated, momentary
RS 76 C keyswitch, illuminated, latching
Keycaps for RS 76, non-illuminated
Keycap for RS 76, opaque
Keycap for RS 76, opaque, with nail protection
Keycap for RS 76 with legend insert
Keycaps for RS 76, illuminated
Keycap for RS 76 with light bar
Keycap for RS 76, illuminated, with legend insert
Keycap for RS 76, illuminated, with nail protection and legend insert
Keycap for RS 76, illuminated, with legend insert
Keycap, fully illuminated, for RS 76 MX
Keycaps for RS 76, with legend, two-shot moulded/keycap sets
Keycap set for RS 76, symbols A-Z
Keycap set for RS 76, symbols 0-9
RS 76 accessories
Cover for RS 76 IP40
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4
RS
76
PCB Keyswitches
Stock items
are marked
by
bold printed
order numbers.
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RS 76 full-travel keyswitches
The Rafi full-travel keyswitches RS 76 are modular
systems for designing individual key blocks and
keyboards in the 3/4 inch (= 19.05 mm) grid.
Definitions
Momentary keyswitches
Momentary keyswitches return to their initial position
after being pressed (momentary action).
Latching keyswitches
Latching keyswitches lock when actuated and are
returned to their initial position when pressed again
(push-push action).
Keycap materials
Keycap without legend insert: ABS
Keycap with legend insert:
– Keycap body: ABS
– Lens: PC
Keycap, n-module
A 2-module keycap f. ex. has the twofold length of a
1-module keycap.
Contact principle
There are two contact principles:
– Mechanical (M):
Cross contact (RS 76 M)
Bridge contact
(RS 76 M, illuminated)
– Contactless (C):
Based on Hall-IC (RS 76 C)
Soldering
The soldering temperature should not exceed 250 °C, the
soldering time not be longer tahn 3 seconds.
All RS 76 C-keyswitches can be soldered in solder bathes.
The assembled PCB should be cleaned only by using
brushing machines from the soldering side ot the PCB.
The cleaning agend should not exceed the component
side ot the PCB.
All
keyswitches can be flow-soldered, provided that an
acid fluxer is used and that the whole unit is cleaned
afterwards in de-ionised water.
Cleaning
Keyswitches should not be washed in freon or similar
substances as a lubricant is used, otherwise the operating
life of the keyswitches will be reduced.
If complete keyboards are to be cleaned by dipping, it
must be remembered that they keyboard may only be
dipped in the dipping solution as far as the component
side of the PCB.
Legending of keycaps
Keycaps can be legended by different methods:
Two-shot moulding
Using this method the symbol is separately manufactured
from a plastic and then the appropriate keycap form is
moulded round it. Advantage: The character becomes a
integrated part of the keycap, thus eliminating abrasion.
All Rafi keycap sets with standard legending are
manufatured by this method.
Customer specific two-shot moulded keycaps on request.
Printing
Keycaps can be printed with a two-component ink on
request. The abrasin of this kind of legending is high.
This method of legending is suitable for average
volumes.
Engraving
In this labour intensive process the keycaps are engraved
with the required symbol, then inlaid with ink. Only used
for small volumes.
Laser-printing
This method of legending can be recommended when
complete keyboards are required in different keyboard
layouts for which Rafi will develop the respective
software. The keyboards can then be legended within a
short time. This method of legending ist particularly
recommended for average to large volumes.
Legend inserts
In the case of keycaps with replaceable legend inserts it is
possible to print or engrave the legend inserts. As these
insets are protected by the lens, there can be no abrasion
here either.
4
RS
76
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PCB Keyswitches
RS 76 full-travel keyswitches
Design
No. Description
1.1 Keyswitch RS 76 C
1.2 Keyswitch RS 76 C with LED
1.3 Keyswitch RS 76 M
1.4 Keyswitch R 76 M with LED
2 Keycap, 1- resp. multi-module
3 Keycap with nail protection, 1- resp. multi-module
5 Keycap, illuminated
6 Keycap, illuminated
7 Keycap, illuminated
8 LED
9 Spacer for LED (for RS 76 C only)
10.1 Plunger for mult-moduel keycaps*
10.2 Sleeve for multi-moduel keycaps*
10.3 Metal lever for multi-module keycaps*
10.4 Bearing bracket for multi-module keycaps*
11 Covers
4
* These parts are included as a complete packet in the delivery of keycaps
≥
2-module.
RS
76
PCB Keyswitches
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RS 76 full-travel keyswitches
Hole Pattern PCB RS 76 M/RS 76 C
The hole patterns apply to the horizontal position of
the keycaps only. Should they be in a vertical position,
the momentary keyswitch must be mounted accordingly,
i.e. rotated by 90°.
For 1 – 1
3
/
4
-module keycaps (view on component side)
Momentary keyswitch, non-illuminated
Momentary keyswitch, illuminated
RS 76 M
RS 76 C
4
For 2-, 3- and 8-module keycaps (view on component side)
RS 76 M/C
Hole diam. 2
Nor through-plating
• 4 holes for bearing bracket diam. 1.1
No through-plating
Metal bow touches the surface of PCB,
in this area no conductor tracks on component side
Keycap
RS
76
L1
mm
L2
mm
2-module
3-module
5-module
25.40
30.48
68.58
22.86
24.13
68.58
Important note:
In the case of 2-, 3- and 8-module
keycaps, additional holes must be provided for the
accessories.
In the case of keycaps < 2-module, neither accessories nor
holes are required.
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PCB Keyswitches
RS 76 full-travel keyswitches
Specific Technical Data RS 76 C
Output pulse diagram
Dynamic characteristics
(max.)
Tw = 25 °C
Tw = 50 °C
Tw = 70 °C
Turn-on delay time
Turn-off delay time
Fall/rise time
t
PHL
t
PHL
t
PHL
t
PHL
3 µs
4 µs
2 µs
1 µs
7 µs
5 µs
2,5 µs
1,5 µs
10 µs
6 µs
3 µs
2,5 µs
4
Static with Enable Input
RS
76
PCB Keyswitches
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