Year: 2025

D1555 Datasheet PDF – 3DD1555, 1500V, 5A, NPN Transistor

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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:

D1555 datasheet

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


3DD1555 pdf

B1642 Datasheet – 60V, 4A, PNP Transistor – 2SB1642

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Part Number : 2SB1642

Function: -60V, -4A, PNP Triple Diffused Type Transistor

Package: TO-220 Type

Manufacturer: Toshiba

Image

transistor B1642 pdf

Description

The B1642 is a high-power PNP silicon transistor in a TO-220F (or similar) package, designed especially for audio frequency output stages. It supports a collector current up to –4 A and a breakdown voltage of –60 V, and features low saturation voltage for efficient switching. It’s typically used in audio amplifiers, power amplifier stages, and complementary transistor pairs in push-pull outputs.

 

Features

  • Collector–Emitter breakdown voltage VCEO = –60 V (minimum)
  • Collector current (continuous) IC = –4 A
  • Low saturation voltage VCE(sat) = –1.5 V (max) at IC = –2.5 A, IB = –0.25 A
  • Wide DC current gain: hFE = 100 to 320 at moderate currents
  • Transition frequency fT ≈ 9 MHz
  • Collector power dissipation PC = 25 W (at case)
  • Collector–Base voltage VCBO = –60 V
  • Emitter–Base breakdown voltage VEBO = –7 V
  • Capacitance (Cob): ~50 pF (VCB = –10 V, f = 1 MHz)

 

Absolute Maximum Ratings (Ta = 25 °C)

Parameter Symbol Value Unit
Collector–Base voltage VCBO –60 V
Collector–Emitter voltage VCEO –60 V
Emitter–Base voltage VEBO –7 V
Collector current, continuous IC –4 A
Base current, continuous IB –1 A
Power dissipation (case) PC 25 W
Maximum junction temperature TJ 150 °C
Storage temperature Tstg –55 to +150 °C

B1642 pinout

 

Applications

  • Output stage in audio power amplifiers (PNP side)
  • Complementary transistor in push-pull amplifier topologies
  • Driver stage in class AB amplifiers
  • Power amplification for speaker drivers and stereo systems
  • General PNP high current switching roles in audio circuits

Alternative / Equivalent Products

  • 2SB1640 – a close PNP transistor variant with similar specs
  • 2SB1667 – alternative PNP transistor in audio designs
  • 2SA1943 (if complementary or higher voltage rating required)
  • BD140 / BD139 (lower power but common PNP alternatives)
  • MJE2955 – another PNP power transistor with somewhat higher voltage headroom

B1642 Datasheet