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Fujitsu FKB3000 Series



Fujitsu FKB3000 Series covers flat-surface keypads, known as “sheet key” (シートキー) type. Stock models were available in arrangements of 1×4, 4×3, 4×4, 5×4, 4×6, 4×12 and 5×13 keys. Fully custom types were also available. The fully-custom types were available with two switch types: third-generation leaf spring with 1.3 mm of travel (FES-301S), and “FES-310” with 0.3 mm of travel. The diagram of the latter makes no sense: it shows some sort of enclosed switch held down loosely with hoops, that despite its large size only offers 0.3 mm of travel.

The Fujitsu journal depicted a sheet keyboard in November 1979, with the description “シートーキーボード3000シリーズ”: “3000 Series sheet keyboard”. As this is the same issue that introduced sheet keyboards, one would assume from this that 3000 series keyboards originally used FES-300 switches.

Keyboards of this general type observed in production have used N860 codes in the 3100 and 3700 blocks, and it is not known whether those count as the same series or not. They also have a different construction to standard FKB3000 types, although the single stock photograph presented by Fujitsu of a custom FKB3000 keyboard is different again.


The specifications below are taken from the two datasheets. Note the the operating force as standard is very high.

Type FES-301S FES-310
Total travel 1.3 mm 0.3 mm
Operating force 147 cN 196 cN
Lifetime 10 million times 5 million times
Contact resistance 1 Ω or less at 6 V DC, 10 mA
Bounce time 10 ms or less


For existing customers



The FKB3000 Series datasheets were obtained from the Fujitsu Components Limited (FCL) website; Fujitsu have since removed this material due to product cancellation.