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IEVT/Tipro Series TZ



“Nizkoprofilna tipka Serije TZ” (TSeries Z low-profile keyswitch) DIN-compliant keyboard switch series. The design is loosely based on Cherry MX. Series TZ originated at IEVT and continued by Tipro until the latter organisation discontinued them in favour of Cherry MX.

Series TZ switches accept IEVT’s and Tipro’s lower-profile Series Z keycaps.


The following models are listed in the IEVT/Tipro switches and keycaps brochure.

The details below carry the caveat that they may be mistranslated or misunderstood.

Model Configuration and behaviour
TZ 1 SPST-NO momentary
TZ 2 DPST-NO momentary
TZ 4 SPST-NO momentary with LED


The specifications below are the correct figures, but the headings may be subject to misinterpretation of the original Croatian and Slovakian text.

Total travel 4 mm (most models)
Pretravel 2±0.3 mm
Operating force 80±20 cN
Operating temperature −10 to +80 °C
Bounce time < 2 ms
Rated life > 20 × 10⁶ cycles
Operating power < 3 VA
Voltage < 100 V DC
Current (breaking) < 150 mA
Contact resistance < 50 mΩ


There are no known IEVT examples, although these switches are known from a few rare Tipro keyboards.