BU508DX High Voltage NPN Transistor

Overview

The BU508DX is a high-voltage, high-speed switching NPN transistor housed in a fully isolated SOT399 package. This component features an integrated efficiency diode, making it particularly suitable for demanding applications such as horizontal deflection circuits in color television receivers. The BU508DX is designed to deliver robust performance under high-voltage conditions while ensuring efficient switching characteristics.

This transistor is engineered to meet the stringent requirements of modern electronic systems, offering a combination of high breakdown voltage, fast switching speeds, and thermal stability. Its fully isolated package enhances electrical isolation and thermal dissipation, making it a reliable choice for high-performance applications.

Features

• High Voltage Capability: Designed to handle high-voltage applications with ease.
• Integrated Efficiency Diode: Includes a built-in diode to improve circuit efficiency and reduce external component count.
• High-Speed Switching: Optimized for fast switching applications, ensuring minimal delay and high performance.
• Fully Isolated Package (SOT399): Enhances electrical isolation and thermal management.
• Robust Thermal Performance: Designed to operate reliably under high thermal stress.
• Low Saturation Voltage: Ensures efficient operation with minimal power loss.
• Wide Application Range: Suitable for use in television deflection circuits, power supplies, and other high-voltage applications.

Applications

The BU508DX is primarily designed for high-voltage switching applications, with a particular focus on the following uses:

• Horizontal Deflection Circuits: Ideal for color television receivers and CRT-based displays.
• Switch-Mode Power Supplies (SMPS): Suitable for high-voltage power supply designs requiring fast switching.
• Electronic Ballasts: Used in lighting applications where high voltage and efficient switching are required.
• High-Voltage Inverters: Applicable in systems requiring voltage conversion and inversion.
• Industrial Electronics: Used in various industrial control systems and high-voltage switching applications.

Electrical Characteristics

The following table outlines the key electrical characteristics of the BU508DX under typical operating conditions:

Absolute Maximum Ratings

• Collector-Emitter Voltage (V_CEO): 1500V
• Collector-Base Voltage (V_CBO): 1700V
• Emitter-Base Voltage (V_EBO): 7V
• Collector Current (I_C): 8A
• Base Current (I_B): 2A
• Total Power Dissipation (P_tot): 50W
• Operating Junction Temperature (T_j): -55°C to +150°C
• Storage Temperature Range (T_stg): -55°C to +150°C

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

• DC Current Gain (h_FE): 8 to 40 (at I_C = 2A, V_CE = 5V)
• Collector-Emitter Saturation Voltage (V_CE(sat)): 1.5V max (at I_C = 4A, I_B = 1A)
• Base-Emitter Saturation Voltage (V_BE(sat)): 2.5V max (at I_C = 4A, I_B = 1A)
• Turn-On Time (t_on): 1.5µs max (at I_C = 4A, V_CC = 400V, R_L = 100Ω)
• Turn-Off Time (t_off): 5µs max (at I_C = 4A, V_CC = 400V, R_L = 100Ω)
• Collector Cut-Off Current (I_CEO): 1mA max (at V_CE = 1000V)
• Emitter Cut-Off Current (I_EBO): 100µA max (at V_EB = 7V)

Package Information

The BU508DX is housed in an SOT399 package, which provides excellent thermal and electrical isolation. The package dimensions and pin configuration are as follows:

Package Dimensions

• Package Type: SOT399 (Fully Isolated)
• Length: 10.2mm
• Width: 8.6mm
• Height: 3.5mm
• Lead Pitch: 5.08mm

Pin Configuration

• Pin 1: Base (B)
• Pin 2: Collector (C)
• Pin 3: Emitter (E)

Thermal Characteristics

• Thermal Resistance, Junction-to-Case (R_th(j-c)): 1.5°C/W
• Thermal Resistance, Junction-to-Ambient (R_th(j-a)): 62.5°C/W

Conclusion

The BU508DX is a high-performance NPN transistor designed for high-voltage, high-speed switching applications. Its integrated efficiency diode, robust thermal characteristics, and fully isolated package make it an excellent choice for demanding environments such as television deflection circuits and power supplies. With its high breakdown voltage and fast switching times, the BU508DX ensures reliable operation in a wide range of electronic systems.