Power Transistor 2SD1555 NPN, 5A TO-3PF

Power Transistor 2SD1555 NPN, 5A TO-3PF

Transistors

Reference: TR2SD1555

Part.No: 2SD1555

€3.55

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The 2SD1555 is a high-voltage NPN Bipolar Junction Transistor (BJT) in a TO-3PF isolated package. Designed specifically for horizontal deflection circuits in CRT displays and high-voltage switching applications, featuring a built-in damper diode for protection.

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Description
Product Details

2SD1555 High-Voltage Power Transistor - CRT Deflection & High-Voltage Switching

The 2SD1555 is a specialized high-voltage NPN power transistor rated for 600V, engineered for demanding deflection and high-voltage switching circuits. Its integrated damper diode and robust TO-3PF isolated package make it the go-to choice for vintage CRT monitor repairs and industrial deflection applications.

Functions & Applications

Extreme Voltage Rating: 600V Vceo enables operation in high-voltage deflection and switching circuits.
Integrated Damper Diode: Built-in protection against inductive transients and voltage spikes.
Isolated TO-3PF Package: Thermally robust and electrically isolated case, ideal for safety-critical applications.
Moderate Current Handling: 5A collector current suitable for medium-power deflection and switching tasks.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-3PF
Collector-Emitter Voltage (Vceo)	600V
Max Collector Current (Ic)	5A
Integrated Damper Diode	Yes
Mounting Type	Isolated TO-3PF

Frequently Asked Questions

Q: What is the damper diode in the 2SD1555?
A: The built-in damper diode protects the transistor from inductive kickback when switching off inductive loads (relay coils, deflection yokes). It clamps reverse voltage spikes to safe levels.

Q: Is the 2SD1555 suitable for modern CRT monitor repair?
A: Yes. The 2SD1555 is commonly used in horizontal deflection circuits of vintage CRT monitors. Its 600V rating and integrated damper diode make it ideal for this application.

Notes

Specialized vintage/legacy part for CRT deflection. The integrated damper diode is essential to its design; do not attempt to bypass it. Requires careful attention to polarity and adequate heatsinking in high-current applications.

Note: Price refers to one (1) piece. The component is shipped in bulk without individual packaging.

Transistor Type: BJT (Bipolar Junction Transistor)
Transistor Polarity / Channel: NPN
Transistor Case Style: TO-3PF

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