Micro Switch SD Series

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Micro Switch SD Series
Manufacturer Micro Switch
Inventor Everett A. Vorthmann
Joeseph T. Maupin
Supersedes Micro Switch SW Series
Switch type Linear, Tactile
Sense method Hall effect
Rated lifetime Tested up to 30 billion
(extremely long)
Peak force 45 g to 320 g[Citation needed]

History

These switches are among the highest quality ever produced by any keyboard switch company, with reliability being paramount to their design. For increased reliability, there are both 3 pin and 4 pin designs of the switch. The 4 pin are +5, GND and dual open-collector outputs, allowing wired-or of the X, Y keyboard matrix. These switches are naturally bounce-free!

The Honeywell Hall Effect switch is most famous on some Symbolics keyboards, as well as the Space-cadet keyboard.

The last accessible reference to SN and SD series on the Honeywell website is from the 22nd of February 1999.[1] The products list at this time were:

  • Hall-Effect Keyboards Sales Sheet (02509_a.pdf)
  • SD16 Keyswitch Modules Product Sheet (02503_0.pdf)
  • 63SD30-4 Microcomputer-based Keyboard Product Sheet (02504_0.pdf)
  • 26SD1-2 Point-of-Sale Keyboard Product Sheet (02506_0.pdf)
  • 12SD/16SD Numeric Keyboards Product Sheet (02607_0.pdf)

The PDF documents were not archived. Later that year, Honeywell redesigned their website such that it could no longer be crawled (product data was accessible through form submission), so it is not clear when SD and SN series were phased out.

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 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])

  1. ([A-Z])? Sensor variant? (All sensor PCBs with this code have this printed on it)
    • D - ?
    • Q - ?
    • R - ?
    • T - ?
  2. ([0-9]+) Switch variant
    • 1 - Unknown (white stem)
    • 4 - Momentary action (black stem)
    • 5 - Alternate action (black stem)
    • 6 - Support (short black stem)
    • 11 - Black stem, tactile
    • 12 - LED keycap stem
    • 16 - Alternate keyboard mount[2]
  3. ([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)
  4. ([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)
  5. ([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, 2 redundant sense lines)
    • 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.

Number Action Keystem Weight Signal Known usage
Micro Switch-SD-1A3A.jpg
1A3A Momentary Square, sloped 2.5 oz Sink level Micro Switch 68SD15-1-E
Micro-Switch-SD-1A3B.JPG
1A3B Momentary Square, sloped 2.5 oz Sink pulse Micro Switch 68SD15-1-E
TI-Silent-700-745-Switch-1A3S.JPG
1A3S Momentary Square, sloped 2.5 oz Logic scan TI Telex 58SD17-2-B, TI Silent 700 Model 745 (63D17-3-B)
TI-Silent-700-745-Switch-1A8S.JPG
1A8S Momentary Square, sloped 8.0 oz Logic scan TI Telex 58SD17-2-B, TI Silent 700 Model 745 (63SD17-3-B)
No photograph.svg
1B3S Momentary Square, stepped 2.5 oz Logic scan Nokia MikroMikko 1 keyboard
No photograph.svg
1F5A Momentary None 3.5 oz Sink level UGC-74 Keyboard
No photograph.svg
1K3S Momentary Bar 2.5 oz Logic scan Bunker Ramo ADMIN 20211322
D1K3S Honeywell Hall Effect.jpg
D1K3S Momentary Bar 2.5 oz Logic scan Bunker Ramo ADMIN 20403025
No photograph.svg
2K3S Momentary Bar 2.5 oz Logic scan Bunker Ramo ADMIN 20403025
No photograph.svg
4A1A Momentary Square, sloped 1.1 oz Sink level Honeywell 26SD1-2-H
No photograph.svg
4A1E Momentary Square, sloped 1.1 oz  ? Burroughs TP110, Burroughs TP130
No photograph.svg
T4A2B Momentary Square, sloped 2.0 oz Sink pulse Wang 271-1126 (Meaning of T is unknown)
No photograph.svg
4A2K Momentary Square, sloped 2.0 oz Timed repeat Wang 271-1126
No photograph.svg
4A3A Momentary Square, sloped 2.5 oz Sink level Bud Keypad 83959, Honeywell 26SD1-2-H
No photograph.svg
Q4A3B Momentary Square, sloped 2.5 oz Sink pulse Wang 271-1126 (Meaning of Q is unknown)
No photograph.svg
4A3E Momentary Square, sloped 2.5 oz  ? Burroughs TP110
No photograph.svg
R4A3E Momentary Square, sloped 2.5 oz  ? Burroughs TP130 (Meaning of the R is unknown)
No photograph.svg
4A8E Momentary Square, sloped 8.0 oz  ? Burroughs TP110, Burroughs TP130
Telex-270-4B1D-Switch-Alone.jpg
4B1D Momentary Square, stepped 1.1 oz None Convergent 64-00164, Telex 278
Telex-270-4B1E-Switch-Alone.jpg
4B1E Momentary Square, stepped 1.1 oz  ? Space-cadet, Telex 278
No photograph.svg
4B1S Momentary Square, stepped 1.1 oz Logic scan Convergent 64-00164
Telex-270-4B3E-Switch-Alone.jpg
4B3E Momentary Square, stepped 2.5 oz  ? Symbolics 3600 Rev D, Space-cadet, Telex 278
No photograph.svg
4B3K Momentary Square, stepped 2.5 oz Timed repeat Wang 271-1126
No photograph.svg
4B3S Momentary Square, stepped 2.5 oz Logic scan Intergraph 2710
No photograph.svg
4T3S Momentary Stepped 2.5 oz Logic scan Convergent 64-00164
No photograph.svg
5A3E Alternate Square, sloped 2.5 oz  ? Burroughs TP110, Burroughs TP130
No photograph.svg
6A1D Support Square, sloped 1.1 oz None Convergent 64-00164, Burroughs TP110, Burroughs TP130
Telex-270-6B1D-Switch-Alone.jpg
6B1D Support Square, stepped 1.1 oz None Convergent 64-00164, Space-cadet, Honeywell 26SD1-2-H, Telex 278
Micro-Switch-SD-12B3S.jpg
12B3S Momentary LED support 2.5 oz  ? Convergent 64-00164
No photograph.svg
16B3E Momentary Alternate, stepped 2.5 oz  ? Sun 32SD38-4-E

Availability

SD Series appears to have gone out of production around 1999 or 2000. Keyboards with the switches do show up occasionally on auction sites like Ebay, but this isn't always obvious, and they most certainly don't work with modern computers without a converter. The last known keyboard with these switches was made in mid 1996 for Sun Microsystems. Further research has shown that Honeywell has been using their "dual magnet" design to make backlit switches for industrial keyboards as recently as 1999.[Citation needed]

Electrical characteristics

Sense circuit schematic for a Honeywell Hall Effect switch Sense circuit current sinking profile

Controller sensing characteristics

Sense circuit schematic for a Honeywell Hall Effect switch Sense circuit current sinking profile

Switch dimensions

16SD3-5 Hall Effect Keypad schematic, top view 16SD3-5 Hall Effect Keypad schematic, side view, keytops 16SD3-5 Hall Effect Keypad schematic, side view, no keytops

Documentation

External links

References

  1. Internet Archive Wayback Machine — Hall-Effect Keyboards (1999-02-22)
  2. MouseFan — SUN 32SD38-4-E USA (Japanese only) Last updated 2004-05-02. Retrieved 2015-07-27.