D1978 Overview
2SD1978 Silicon NPN Epitaxial, Darlington Application Low frequency power amplifier plementary pair with 2SB1387 Outline TO-92MOD 2 3 2 1 3 1. Emitter 2. Collector 3. Base 2 kΩ (Typ) 0.5 kΩ (Typ) 1 ID 2SD1978 Ratings (Ta = 25°C) Item Collector to base voltage.