Datasheet

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

JQC-3F Datasheet PDF – PCB Relay ( 10A, 3V to 24V DC )

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Part Number: JQC-3F

Function: PCB Relay ( High-Power Electromagnetic Relay )

Package: 5 Pin DIP Type

Manufacturer: Tongling, HWE ( Yueqing Hengwei Electronics )

Image:

Relay JQC-3F Datasheet

Description

The JQC-3F is a general-purpose electromagnetic PCB relay (single pole changeover / SPDT) commonly offered in coil voltages from 3V to 24V DC. It supports load switching up to around 10A at 250VAC or 30VDC with silver alloy contacts in a compact footprint. This relay is used wherever isolation between control logic and power circuits is needed and space is limited.

Features

1. Contact Form 1A, 1C

2. Contact material : AgCdO

3. Contact Resistance : < 100 Mohm ( 1A 6VDC )

4. Switching Current : 10 A

5. Rated Load : 10A 250VAC/30VDC

Pinouts

JQC-3F pinout

Absolute Maximum Ratings (Ta = 25 °C)

Parameter Symbol Value Unit
Maximum switching voltage VSW 250 VAC / 30 VDC
Maximum switching current ISW 10 A
Coil power Pcoil 0.36 / 0.45 W
Insulation resistance (min) Rins 100 MΩ
Dielectric (coil ↔ contacts) Vdiel1 1500 VAC
Dielectric (open contacts) Vdiel2 750 VAC
Operate time max top 10 ms
Release time max trel 5 ms
Ambient temperature range Tamb –40 to +85 °C

Applications

  • Switching loads in home appliances (e.g. motors, lighting)
  • Control and automation systems requiring isolation
  • Power supply soft start or bypass switching
  • Audio and instrument switching
  • General purpose relay use in industrial electronics

Alternative / Equivalent Products

  • HF3FF (Hongfa) series 10A SPDT relay :contentReference[oaicite:8]{index=8}
  • Songle SRD-05VDC-CL 10A relay (common miniature relay)
  • Panasonic TQ2SA series miniature general purpose relay
  • Omron G5LE series 10A general purpose relay
  • TE / Potter & Brumfield PB series 10A signal relays

Other data sheets are available within the file:

JQC-3F1ADC12V, JQC-3F1ADC24V, JQC-3F1CDC12V, JQC-3F1CDC24V

JQC-3F Datasheet PDF Download


JQC-3F pdf