Editing Micro Switch SD Series (section)

==Features (as per [[Honeywell]])==
Details for switch Model 4A3A which should be consistent across all models, except for operating force:

*'''Total Travel''' - 0.160 in (4.1 mm) nom.
*'''Force''' at operating point - 2.8 oz. (78 g) nom.
*'''Pretravel''' - 0.090 in. (2.3 mm) nom.
*'''Release point''' at 5 VDC and 75°F (24°C) (With respect to free position) - 0.040 in. (1.0 mm) min.

Note that according to the 1998 1001SD Series Chart 2 (listed within Micro Switch SD16 Keyswitch Modules, below) this should be 0.695 N/2.5 oz, so the specifications may have changed over time.

===Part Numbers===
Micro Switch and Honeywell switches typically have the series name within the part number, which was apparently notably not the case for SD Series. According to the 1998 1001SD Series Chart 2, the part numbers are of the form 1001SDnnnn, where the four-character "identification code" is all that is printed on the switch, for brevity.

As a regular expression, the models can be shown as shown below. Descriptions given in italics are observations not corroborated with Micro Switch documentation.

According to the datasheet, "sloped" switches have upright stems: the description refers to how a tilted keyboard the keycap top surfaces will be sloped. Angled stem switches are called "stepped" due to the presentation of a staircase profile in a tilted keyboard.

([A-Z])?([0-9]+)([A-Z])([0-9])([A-Z])

#([A-Z])? '''Sensor variant?''' (All sensor PCBs with this code have this printed on it)
#*D - ?
#*Q - ?
#*R - ?
#*T - ?
#([0-9]+) '''Switch variant'''
#*1 - ''Unknown (white stem)''
#*4 - Momentary action (black stem)
#*5 - Alternate action (black stem)
#*6 - Support (short black stem)
#*10 - External latching, used on both caps lock and shift on some keyboards.
#*11 - ''Black stem, tactile''
#*12 - ''LED keycap stem''
#*16 - ''Alternate keyboard mount''<ref name="MouseFan_altmicro" />
#([A-Z]) '''Stem type'''
#*A - Sloped ''(non-angled)''
#*B - Stepped ''(angled)''
#*F - ''No keycap stem''
#*G - Flat top
#*H - Flat-stepped
#*K - ''Narrow bar stem''
#*S - Sloped
#*T - Stepped ''(ridged housing)''
#([0-9]) '''Switch weighting''' (hard to read in the datasheet; some figures are best guesses)
#*1 - 0.362 N/1.1 oz
#*2 - 0.556 N/2.0 oz
#*3 - 0.695 N/2.5 oz
#*5 - 0.973 N/3.5 oz
#*6 - 1.668 N/6.0 oz
#*8 - 2.224 N/8.0 oz
#*4 - No spring (use with three unit button)
#([A-Z]) '''Switch output'''
#*A - Sink level ''(4 pins, 2 redundant sense lines)''
#*B - Sink pulse
#*C - Source level
#*E - ''3 pins, 1 sense line''
#*K - Timed repeat ''(4 pins, 2 redundant sense lines)''
#*S - Logic scan ''(4 pins: +5, OUT, IN, GND)''
#*D - None

===Known Variants===
Variants are listed in order of part number. The extra character found at the start of some part numbers is treated separately for the purposes of sorting; for example D1K3S is listed after 1K3S.

{| class="wikitable variants-table"
!
!Number
!Action
!Keystem
!Weight
!Signal
!Known usage
|-
|[[Image:Micro Switch-SD-1A3A.jpg|100x100px|none]]
|1A3A
|Momentary
|Square, sloped
|2.5 oz
|Sink level
|[[Micro Switch 68SD15-1-E]]
|-
|[[Image:Micro-Switch-SD-1A3B.JPG|100x100px|none]]
|1A3B
|Momentary
|Square, sloped
|2.5 oz
|Sink pulse
|[[Micro Switch 68SD15-1-E]]
|-
|[[Image:TI-Silent-700-745-Switch-1A3S.JPG|100x100px|none]]
|1A3S
|Momentary
|Square, sloped
|2.5 oz
|Logic scan
|[[TI Telex 58SD17-2-B]], [[TI Silent 700 Model 745|TI Silent 700 Model 745 (63D17-3-B)]]
|-
| |[[Image:TI-Silent-700-745-Switch-1A8S.JPG|100x100px|none]]
|1A8S
|Momentary
|Square, sloped
|8.0 oz
|Logic scan
|[[TI Telex 58SD17-2-B]], [[TI Silent 700 Model 745|TI Silent 700 Model 745 (63SD17-3-B)]]
|-
|[[Image:No photograph.svg|100x100px|none]]
|1B3S
|Momentary
|Square, stepped
|2.5 oz
|Logic scan
|[[Nokia MikroMikko 1 keyboard]]
|-
|[[Image:No photograph.svg|100x100px|none]]
|1F5A
|Momentary
|None
|3.5 oz
|Sink level
|[[UGC-74 Keyboard]]
|-
|[[Image:No photograph.svg|100x100px|none]]
|1K3S
|Momentary
|Bar
|2.5 oz
|Logic scan
|[[Bunker Ramo ADMIN 20211322]]
|-
|[[Image:D1K3S Honeywell Hall Effect.jpg|100x100px|none]]
|D1K3S
|Momentary
|Bar
|2.5 oz
|Logic scan
|[[Bunker Ramo ADMIN 20403025]]
|-
|[[Image:No photograph.svg|100x100px|none]]
|2K3S
|Momentary
|Bar
|2.5 oz
|Logic scan
|[[Bunker Ramo ADMIN 20403025]]
|-
|[[Image:No photograph.svg|100x100px|none]]
|4A1A
|Momentary
|Square, sloped
|1.1 oz
|Sink level
|[[Honeywell 26SD1-2-H]]
|-
|[[Image:No photograph.svg|100x100px|none]]
|4A1E
|Momentary
|Square, sloped
|1.1 oz
|?
|[[Burroughs TP110]], [[Burroughs TP130]], [[Burroughs RIII]]
|-
|[[Image:No photograph.svg|100x100px|none]]
|T4A2B
|Momentary
|Square, sloped
|2.0 oz
|Sink pulse
|[[Wang 271-1126]] (Meaning of T is unknown)
|-
|[[Image:No photograph.svg|100x100px|none]]
|4A2K
|Momentary
|Square, sloped
|2.0 oz
|Timed repeat
|[[Wang 271-1126]]
|-
|[[Image:No photograph.svg|100x100px|none]]
|4A3A
|Momentary
|Square, sloped
|2.5 oz
|Sink level
|[[Bud Keypad 83959]], [[Honeywell 26SD1-2-H]]
|-
|[[Image:No photograph.svg|100x100px|none]]
|Q4A3B
|Momentary
|Square, sloped
|2.5 oz
|Sink pulse
|[[Wang 271-1126]] (Meaning of Q is unknown)
|-
|[[Image:No photograph.svg|100x100px|none]]
|4A3E
|Momentary
|Square, sloped
|2.5 oz
|?
|[[Burroughs TP110]]
|-
|[[Image:No photograph.svg|100x100px|none]]
|R4A3E
|Momentary
|Square, sloped
|2.5 oz
|?
|[[Burroughs TP130]] (Meaning of the R is unknown)
|-
|[[Image:No photograph.svg|100x100px|none]]
|4A8E
|Momentary
|Square, sloped
|8.0 oz
|?
|[[Burroughs TP110]], [[Burroughs TP130]]
|-
|[[Image:Telex-270-4B1D-Switch-Alone.jpg|100x100px|none]]
|4B1D
|Momentary
|Square, stepped
|1.1 oz
|None
|[[Convergent 64-00164]], [[Telex 270 Keyboards#PN: 952003-222|Telex 278]]
|-
|[[Image:Telex-270-4B1E-Switch-Alone.jpg|100x100px|none]]
|4B1E
|Momentary
|Square, stepped
|1.1 oz
|?
|[[Space-cadet keyboard|Space-cadet]], [[Telex 270 Keyboards#PN: 952003-222|Telex 278]], [[Burroughs RIII]]
|-
|[[Image:No photograph.svg|100x100px|none]]
|4B1S
|Momentary
|Square, stepped
|1.1 oz
|Logic scan
|[[Convergent 64-00164]]
|-
|[[Image:No photograph.svg|100x100px|none]]
|4B2E
|Momentary
|Square, stepped
|1.1 oz
|?
|[[Burroughs RIII]]
|-
|[[Image:Telex-270-4B3E-Switch-Alone.jpg|100x100px|none]]
|4B3E
|Momentary
|Square, stepped
|2.5 oz
|?
|[[Symbolics 3600 Rev D]], [[Space-cadet keyboard|Space-cadet]], [[Telex 270 Keyboards#PN: 952003-222|Telex 278]]
|-
|[[Image:No photograph.svg|100x100px|none]]
|4B3K
|Momentary
|Square, stepped
|2.5 oz
|Timed repeat
|[[Wang 271-1126]]
|-
|[[File:4B3S.jpg|100x100px|thumb|none|4B3S]]
|4B3S
|Momentary
|Square, stepped
|2.5 oz
|Logic scan
|[[Intergraph 2710]]
|-
|[[Image:No photograph.svg|100x100px|none]]
|4T3S
|Momentary
|Stepped
|2.5 oz
|Logic scan
|[[Convergent 64-00164]]
|-
|[[Image:No photograph.svg|100x100px|none]]
|5A3E
|Alternate
|Square, sloped
|2.5 oz
|?
|[[Burroughs TP110]], [[Burroughs TP130]]
|-
|[[Image:No photograph.svg|100x100px|none]]
|6A1D
|Support
|Square, sloped
|1.1 oz
|None
|[[Convergent 64-00164]], [[Burroughs TP110]], [[Burroughs TP130]], [[Burroughs RIII]]
|-
|[[Image:Telex-270-6B1D-Switch-Alone.jpg|100x100px|none]]
|6B1D
|Support
|Square, stepped
|1.1 oz
|None
|[[Convergent 64-00164]], [[Space-cadet keyboard|Space-cadet]], [[Honeywell 26SD1-2-H]], [[Telex 270 Keyboards#PN: 952003-222|Telex 278]], [[Burroughs RIII]]
|-
|[[File:9B3B.jpg|left|thumb|106x106px]]
|9B3B
|Momentary
|LED support
|?
|?
|[https://deskthority.net/viewtopic.php?f=62&t=23087 SD-16073]
|-
|[[Image:Micro-Switch-SD-12B3S.jpg|100x100px|none]]
|12B3S
|Momentary
|LED support
|2.5 oz
|?
|[[Convergent 64-00164]]
|-
|[[Image:No photograph.svg|100x100px|none]]
|10B2E
|Momentary
|Square, stepped
|2.2 oz
|?
|[[Burroughs RIII]]
|-
|[[Image:No photograph.svg|100x100px|none]]
|16B3E
|Momentary
|Alternate, stepped
|2.5 oz
|?
|[[Sun 32SD38-4-E]]
|}