SP420401N Datasheet. Part #: SP4203. Datasheet: 836Kb/5P. Manufacturer: Littelfuse. Description: SP4203 0.5 pF, 10A bidirectional discrete TVS diodes. 5 Results. Part #: SP4203-01FTG-C. Datasheet: 836Kb/5P. Manufacturer: Littelfuse.