D1557 Datasheet PDF – 1700V, Power NPN Transistor

This is one of the transistor types.

Part Number: D1557, 3DD1557

Function:  Low frequency amplification bipolar transistor

Package: TO-3P(H)IS Type

Manufacturer: Jilin Sino-Microelectronics


D1557 datasheet


The D1557 is a high back pressure NPN bipolar power transistor, manufacturing The main technology employed: high-pressure technology mesa, triplet Diffusion of technology, the use of plastic full encapsulation structure.


1. High voltage: VCBO = 1700V
2. Saturation pressure drop: VCE (sat) = 1V (max.)
3. High switching speed: tf = 0.8μS (max.)
4. High reliability
5. Environmental protection (RoHS) products

Applications: Color TV line output circuit

D1557 pinout

Absolute maximum ratings

1. Collector-Base Voltage: Vcbo = 1700 V
2. Collector-Emitter Voltage: Vceo = 830 V
3. Emitter-Base Voltage: Vebo = 8 V
4. Collector Current: Ic = 10 A
5. Base Current : Ib = 5 A
6. Power Dissipation : Pc = 50 W

Reference Site:



D1557 Datasheet


D1557 pdf