The 3DD1555 is a high-voltage NPN bipolar power transistor specifically engineered for horizontal deflection output (H.O.T) stages in CRT displays such as color TVs and monitors. It is optimized for high-voltage switching, fast fall time, and rugged avalanche capability.
Part Number: 3DD1555
Function: Silicon NPN Bipolar Transistor
Package: TO-3P(H)IS Type
Manufacturer: Jilin Sino-Microelectronics
See the preview image and the PDF file for more information.
Pinouts:
Description
D1555 is high breakdown voltage of NPN bipolar transistor. The main process of manufacture : high voltage mesa type process, triple diffused process etc., adoption of fully plastic packge. RoHS product.
Absolute maximum ratings ( Tc=25°C )
1. Collector to Base Voltage: Vcbo = 1500 V
2. Collector to Emitter Voltage: Vceo = 600 V
3. Emitter to Base Voltage: Vebo = 6 V
4. Collector Current: Ic = 5 A
5. Total Dissipation : Pc = 50 W
6. Junction Temperature: Tj = 150°C
7. Storage Temperature: Tsg = -55 ~ +150°C
Key Design Insights
- High Voltage Margin: 1500V VCBO is critical for flyback spikes
- Switching Speed: Fast fall time reduces switching loss and heating
- Avalanche Ruggedness: Must absorb inductive energy safely
- Thermal Management: Requires proper heatsinking in operation
- Base Drive: Requires strong base drive for fast saturation and turn-off
Design Considerations
- Use proper snubber (RC or RCD clamp) to limit overvoltage
- Ensure fast base discharge (to avoid storage time issues)
- Avoid secondary breakdown by respecting SOA (Safe Operating Area)
- Layout must minimize parasitic inductance
- Thermal coupling to heatsink is mandatory for reliability
Alternative / Equivalent Devices
- 2SC5296
- BU508A / BU508DF
- D1555 series variants
- J6810 (similar application class)
- 2SD1555
Applications
- CRT color TV horizontal deflection output stage
- CRT monitor deflection circuits
- High-voltage pulse switching applications
Other data sheets are available within the file: 3DD1555, 3DD1555-O-A-N-D
D1555 Datasheet PDF Download
