RD3.9MW Datasheet, NEC

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* VZ; Applied E24 standard Surge absorber on either side 1.5 0.65 +0.1
  –0.15 0.95 0.95 APPLICATIONS Circuits for Constant Voltage, Constan.

Circuits for Constant Voltage, Constant Current, Wavefore clipper, Surge absorber, ESD Protect circuit, etc. 2.9 ± 0.2 .

Type RD2.0MW to RD39MW Series are 3-PIN Mini Mold Package zener diodes possessing allowable power dissipation of 200 mW. 0.4
  –0.05 PACKAGE DIMENSIONS (Unit: mm) 2.8 ± 0.2 +0.1 FEATURES
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* VZ; Applied E24 standard Surge ab.