See Littelfuse Commercial Vehicle Products Products
Zener Diode - JANS Level - 3.9V - ±5% - 500mW - 1650 Ohms - 2.5µA @ 2V Reverse Leakage @ Vr - 1.1V @ 200mA Forward (Vf) (Max) @ If - DO-35 (DO-204AH).