BU505F

#BU505F #high voltage #switching #NPN #power transistor #TO-3 #industrial applications #electronic circuits

BU505F Technical Summary

BU505F High-Voltage, High-Speed Switching Transistor

Overview

The BU505F is a high-performance, high-voltage switching transistor designed for demanding applications requiring fast switching speeds and robust voltage handling capabilities. This NPN bipolar junction transistor (BJT) is engineered to deliver reliable performance in high-voltage circuits while maintaining excellent switching characteristics.

With its optimized construction, the BU505F offers superior performance in applications such as CRT deflection circuits, switch-mode power supplies, and other high-voltage switching systems. The device features a high breakdown voltage and low saturation voltage, making it particularly suitable for energy-efficient designs.

Key Features

High collector-emitter voltage rating (V_CEO = 1500V)
Fast switching speed with optimized rise and fall times
Low collector-emitter saturation voltage
High current handling capability
Excellent safe operating area (SOA) characteristics
Designed for high reliability and long-term stability
TO-3P package for efficient thermal management
Pb-free and RoHS compliant

Applications

The BU505F is ideally suited for a wide range of high-voltage applications, including:

Display Systems

CRT deflection circuits
Monitor and television horizontal deflection systems
High-voltage video output stages

Power Management

Switch-mode power supplies (SMPS)
DC-DC converters
Inverter circuits

Industrial Systems

High-voltage pulse generators
Electronic ballasts
Industrial control systems

Electrical Characteristics

The following tables detail the key electrical specifications of the BU505F transistor:

Absolute Maximum Ratings

Parameter	Symbol	Value	Unit
Collector-Emitter Voltage	V_CEO	1500	V
Collector-Base Voltage	V_CBO	1700	V
Emitter-Base Voltage	V_EBO	7	V
Collector Current (Continuous)	I_C	7.5	A
Base Current (Continuous)	I_B	2.5	A
Total Power Dissipation	P_tot	100	W
Junction Temperature	T_j	150	°C
Storage Temperature Range	T_stg	-55 to +150	°C

Thermal Characteristics

Parameter	Symbol	Value	Unit
Thermal Resistance, Junction to Case	R_th(j-c)	1.25	°C/W
Thermal Resistance, Junction to Ambient	R_th(j-a)	62.5	°C/W

Switching Characteristics (T_j = 25°C unless otherwise specified)

Parameter	Symbol	Test Conditions	Min	Typ	Max	Unit
Turn-On Time	t_on	I_C = 3A, V_CC = 400V	-	0.5	1.0	µs
Turn-Off Time	t_off	I_C = 3A, V_CC = 400V	-	1.5	3.0	µs
Storage Time	t_s	I_C = 3A, V_CC = 400V	-	0.8	1.5	µs

Package Information

The BU505F is available in a TO-3P package, which provides excellent thermal performance and mechanical robustness. The package details are as follows: