Micro Switch SD Series switches
This page documents known Micro Switch SD Series Hall effect keyboard switches (formerly known as “Honeywell Hall Effect” within the keyboard enthusiast community). Both the catalogue listing numbers and identification codes are given for convenience. Some types are taken from Honeywell charts, some from discovered keyboards, and the rest from surplus part listings. There are over a thousand possible types, but most such types are unlikely to have been produced.
Parts listed on supplier sites are almost always out of stock, overpriced (often extortionately so), or big boys’ club only. Outbound links are only offered to deserving suppliers where parts are stocked and made available at a reasonable price. The supplier names are given only as a reassurance that the data was present on another website; no guarantee is made that the part numbers are accurate and that the parts listed exist (the entries could have been mistyped).
The types with prefix letters (e.g. Q4A3B) are not shown with catalogue listing numbers, as no catalogue listing numbers have been confirmed for these types. (The prefix letter is not guaranteed to be part of the catalogue listing number.)
Abbreviated identification codes are listed first, to avoid confusion. Where switches have not been assumed, the identification code is an assumption only, as some types used abbeviated identification codes. 1001SD chart 7 shows abbreviated identification codes with a space before the “S”, while in practice this space has been found to be omitted. Catalogue listing numbers in italics are guesses based on abbreviated identification codes. The existence of A/B, S/T and V keystems that all look the same prevents precise identification.
A source of “⌨️” indicates that the switch is given on the SD keyboards page.
Cat. listing | Ident. code | Type | Keycap mount | Weight | Output | Source | Observed | NSN |
---|---|---|---|---|---|---|---|---|
1SD1C1A-R | 1C1A | Momentary | NCR blade | 1.3 oz | Sink level | eBay | ✓ | |
(1001SD6B1D) | 1DS | Support | Stepped | 1.3 oz | None | ⌨️ | ✓ | |
(1001SD4B1A) | 1AS 1A S |
Momentary | Square, stepped | 1.3 oz | Sink level | ⌨️ | ✓ | |
1001SD1C1A | Momentary | NCR blade | 1001SD chart 7 | |||||
1001SD1C1B | 1B S | Momentary | NCR blade | 1.3 oz | Sink pulse | 1001SD chart 7 | ||
(1001SD4B3A) | 3AS 3A S |
Momentary | Square, stepped | 2.5 oz | Sink level | ⌨️ | ✓ | |
1001SD1C3A | Momentary | NCR blade | 1001SD chart 7 | |||||
1001SD2C3A | Alternate action | NCR blade | ||||||
(1001SD12B3A) | N3AS | Illuminated | Blade, stepped | 2.5 oz | Sink level | ⌨️ | ✓ | |
(1001SD4B3B) | 3BS 3B S |
Momentary | Square, stepped | 2.5 oz | Sink pulse | ⌨️ | ✓ | |
1001SD1C3B | Momentary | NCR blade | 1001SD chart 7 | |||||
(1001SD4B6A) | 6AS | Momentary | Square, stepped | 6.0 oz | Sink level | ⌨️ | ✓ | |
1001SD1C6B | 6B S | Momentary | NCR blade | 6.0 oz | Sink pulse | 1001SD chart 7 | ||
1001SD1A3A | 1A3A | Momentary | Square, sloped | 2.5 oz | Sink level | Own collection | ✓ | |
1001SD1A3B | 1A3B | Momentary | Square, sloped | 2.5 oz | Sink pulse | ⌨️ | ||
1001SD1A3S | 1A3S | Momentary | Square, sloped | 2.5 oz | Logic scan | ⌨️ | ✓ | |
1001SD1A8S | 1A8S | Momentary | Square, sloped | 8.0 oz | Logic scan | ⌨️ | ✓ | |
1001SD1B3A | 1B3B | Momentary | Square, stepped | 2.5 oz | Sink level | Own collection | ✓ | |
1001SD1B3B | 1B3B | Momentary | Square, stepped | 2.5 oz | Sink pulse | ⌨️ | ✓ | |
1001SD1B3S | 1B3S | Momentary | Square, stepped | 2.5 oz | Logic scan | Deskthority | ||
1001SD1F1A | 1F1A | Momentary | Flat | 1.3 oz | Sink level | Odyssey Electronics | ||
1001SD1F3A | 1F3A | Momentary | Flat | 2.5 oz | Sink level | ISO Group | 5930-01-090-1602 | |
1001SD1F3K | 1F3K | Momentary | Flat | 2.5 oz | Timed repeat | Odyssey Electronics | ||
1001SD1F3S | 1F3S | Momentary | Flat | 2.5 oz | Logic scan | ⌨️ | ✓ | |
1001SD1F5A | 1F5A | Momentary | Flat | 3.5 oz | Sink level | ⌨️ | ✓ | |
1001SD1K3S | 1K3S | Momentary | Special blade | 2.5 oz | Logic scan | Deskthority | ||
D1K3S | Momentary | Special blade | 2.5 oz | Logic scan | ⌨️ | ✓ | ||
1001SD2A3A | 2A3A | Alternate action | Square, sloped | 2.5 oz | Sink level | Interdata [1] | ||
1001SD2A6A | 2A6A | Alternate action | Square, sloped | 6.0 oz | Sink level | Interdata [1] | ||
1001SD2A6S | 2A6S | Alternate action | Square, sloped | 6.0 oz | Logic scan | Oxygen Electronics | ||
1001SD2K3S | 2K3S | Alternate action | Special blade | 2.5 oz | Logic scan | ⌨️ | ✓ | |
1001SD3B3S | 3B3S | Momentary | Square, stepped | 2.5 oz | Logic scan | Odyssey Electronics | ||
1001SD4A1A | 4A1A | Momentary | Square, sloped | 1.3 oz | Sink level | ⌨️ | ✓ | 5930-01-167-7038 |
1001SD4A1B | 4A1B | Momentary | Square, sloped | 1.3 oz | Sink pulse | ⌨️ | ||
1001SD4A1D | 4A1D | Momentary | Square, sloped | 1.3 oz | None | Oxygen Electronics | ||
1001SD4A1E | 4A1E | Momentary | Square, sloped | 1.3 oz | Three-terminal | ⌨️ | ✓ | |
1001SD4A1S | 4A1S | Momentary | Square, sloped | 1.3 oz | Logic scan | Odyssey Electronics | ||
1001SD4A2B | 4A2B | Momentary | Square, sloped | 2.0 oz | Sink pulse | ⌨️ | ✓ | |
T4A2B | Momentary | Square, sloped | 2.0 oz | Sink pulse | Deskthority | |||
1001SD4A2K | 4A2K | Momentary | Square, sloped | 2.0 oz | Timed repeat | ⌨️ | ✓ | |
1001SD4A3A | 4A3A | Momentary | Square, sloped | 2.5 oz | Sink level | ⌨️ | ✓ | 5930-01-109-2286 |
Q4A3A | Momentary | Square, sloped | 2.5 oz | Sink level | Own collection | ✓ | ||
1001SD4A3B | 4A3B | Momentary | Square, sloped | 2.5 oz | Sink pulse | Own collection | ✓ | |
Q4A3B | Momentary | Square, sloped | 2.5 oz | Sink pulse | Deskthority | |||
1001SD4A3D | 4A3D | Momentary | Square, sloped | 2.5 oz | None | Odyssey Electronics | ||
1001SD4A3E | 4A3E | Momentary | Square, sloped | 2.5 oz | Three-terminal | ⌨️ | ✓ | |
R4A3E | Momentary | Square, sloped | 2.5 oz | Three-terminal | ⌨️ | ✓ | ||
1001SD4A3S | 4A3S | Momentary | Square, sloped | 2.5 oz | Logic scan | ISO Group | 5930-01-271-0012 | |
U4A3S | Momentary | Square, sloped | 2.5 oz | Logic scan | Deskthority | |||
1001SD4A5A | 4A5A | Momentary | Square, sloped | 3.5 oz | Sink level | Odyssey Electronics | ||
1001SD4A6A | 4A6A | Momentary | Square, sloped | 6.0 oz | Sink level | NSN | 5930-01-110-9544 | |
1001SD4A6B | 4A6B | Momentary | Square, sloped | 6.0 oz | Sink pulse | Quest Components | ||
1001SD4A8E | 4A8E | Momentary | Square, sloped | 8.0 oz | Three-terminal | ⌨️ | ✓ | |
1001SD4B1D | 4B1D | Momentary | Square, stepped | 1.3 oz | None | ⌨️ | ✓ | |
1001SD4B1E | 4B1E | Momentary | Square, stepped | 1.3 oz | Three-terminal | ⌨️ | ✓ | |
1001SD4B1K | 4B1K | Momentary | Square, stepped | 1.3 oz | Timed repeat | ⌨️ | ✓ | |
1001SD4B1S | 4B1S | Momentary | Square, stepped | 1.3 oz | Logic scan | Deskthority | ||
1001SD4B2K | 4B2K | Momentary | Square, stepped | 2.0 oz | Timed repeat | ⌨️ | ✓ | |
1001SD4B3A | 4B3A | Momentary | Square, stepped | 2.5 oz | Sink level | ⌨️ | ✓ | |
1001SD4B3B | 4B3B | Momentary | Square, stepped | 2.5 oz | Sink pulse | ⌨️ | ✓ | |
T4B3B | Momentary | Square, stepped | 2.5 oz | Sink pulse | ⌨️ | ✓ | ||
1001SD4B3E | 4B3E | Momentary | Square, stepped | 2.5 oz | Three-terminal | ⌨️ | ✓ | |
R4B3E | Momentary | Square, stepped | 2.5 oz | Three-terminal | Deskthority | ✓ | ||
1001SD4B3K | 4B3K | Momentary | Square, stepped | 2.5 oz | Timed repeat | ⌨️ | ✓ | |
1001SD4B3S | 4B3S | Momentary | Square, stepped | 2.5 oz | Logic scan | ⌨️ | ✓ | |
1001SD4B6E | 4B6E | Momentary | Square, stepped | 6 oz | Three-terminal | ⌨️ | ✓ | |
1001SD4N1E | 4N1E | Momentary | Flat, stepped with pompom | 1.3 oz | Three-terminal | ⌨️ | ✓ | |
1001SD4S1B | 4S1B | Momentary | Square, sloped | 1.3 oz | Sink pulse | Odyssey Electronics | ||
1001SD4T2B | 4T2B | Momentary | Square, stepped | 2.0 oz | Sink pulse | ⌨️ | ✓ | |
1001SD4T3S | 4T3S | Momentary | Square, stepped | 2.5 oz | Logic scan | Deskthority | ||
1001SD4U3E | 4U3E | Momentary | Cruciform | 2.5 oz | Three-terminal | ⌨️ | ✓ | |
R4V3E | Momentary | Square, sloped | 2.5 oz | Three-terminal | ⌨️ | ✓ | ||
1001SD5A3E | 5A3E | Alternate action | Square, sloped | 2.5 oz | Three-terminal | ⌨️ | ✓ | |
1001SD5A6A | 5A6A | Alternate action | Square, sloped | 6 oz | Sink level | ⌨️ | ✓ | |
1001SD5B3A | 5B3A | Alternate action | Square, stepped | 2.5 oz | Sink level | ⌨️ | ✓ | |
1001SD5B3E | 5B3E | Alternate action | Square, stepped | 2.5 oz | Three-terminal | ⌨️ | ✓ | |
1001SD5B3S | 5B3S | Alternate action | Square, stepped | 2.5 oz | Logic scan | ⌨️ | ✓ | |
1001SD6A1D | 6A1D | Support | Sloped | 1.3 oz | None | ⌨️ | ✓ | 5930-01-167-7037 |
1001SD6B1D | 6B1D | Support | Stepped | 1.3 oz | None | ⌨️ | ✓ | 5930-01-295-7817 |
1001SD8A1A | 8A1A | Tactile | Square, sloped | 1.3 oz/70 gf | Sink level | Santa Clara Systems, Inc. | ||
1001SD9A3A | 9A3A | Illuminated | Blade, sloped | 2.5 oz | Sink level | Interdata [1] | ||
1001SD9B3B | 9B3B | Illuminated | Blade, stepped | 2.5 oz | Sink pulse | ⌨️ | ✓ | |
1001SD10B1A | 10B1A | Secretarial shift | Square, stepped | 1.3 oz | Sink level | ⌨️ | ✓ | |
1001SD10B3A | 10B3A | Secretarial shift | Square, stepped | 2.5 oz | Sink level | ⌨️ | ✓ | |
1001SD10B3S | 10B3S | Secretarial shift | Square, stepped | 2.5 oz | Logic scan | ⌨️ | ✓ | |
1001SD11A1A | 11A1A | Momentary tactile | Square, sloped | 1.3 oz/70 gf | Sink level | Soluparts | ||
1001SD11B1A | 11B1A | Momentary tactile | Square, stepped | 1.3 oz/75 gf | Sink level | ⌨️ | ✓ | |
1001SD11B1S | 11B1S | Momentary tactile | Square, stepped | 1.3 oz/75 gf | Logic scan | ⌨️ | ✓ | |
1001SD11B2S | 11B2S | Momentary tactile | Square, stepped | 2.0 oz/95 gf | Logic scan | ⌨️ | ✓ | |
1001SD12A3A | 12A3A | Illuminated | Blade, sloped | 2.5 oz | Sink level | Odyssey Electronics | ||
1001SD12B3A | 12B3A | Illuminated | Blade, stepped | 2.5 oz | Sink level | Quest Components | ||
1001SD12B3S | 12B3S | Illuminated | Blade, stepped | 2.5 oz | Logic scan | Deskthority | ||
1001SD16B2E | 16B2E | Momentary | Slot, stepped | 2.0 oz | Three-terminal | Deskthority | ✓ | |
1001SD16B3E | 16B3E | Momentary | Slot, stepped | 2.5 oz | Three-terminal | ⌨️ | ✓ |
- Interdata Master Part Number List (1/26/79) (note that the OCR data contains typos, e.g. “10015D9A3A”, “1001501A3A”, and that the document reports the alternate action switches as momentary)