Device Overview
The Rohm Semiconductor BU33JA2DG-CTR is a high-voltage, NPN bipolar junction transistor (BJT) designed for general-purpose switching and amplification in industrial, consumer, and automotive applications. This transistor provides high voltage blocking capability, low saturation voltage, and high collector current, making it suitable for relay driving, lamp driving, motor control, and power management applications. Its rugged construction ensures reliable operation under high-voltage and high-current conditions.
Key Features
* NPN bipolar junction transistor with high-voltage and high-current handling.
* Collector-emitter voltage (VCEO) rating of 400 V suitable for medium-voltage circuits.
* Collector current (IC): 3 A continuous operation, supporting moderate power loads.
* Low collector-emitter saturation voltage (VCE(sat)): 2 V typical at IC = 3 A, ensuring efficient switching.
* High power dissipation capability for reliable performance in high-stress applications.
* Complementary gain characteristics with hFE in the range of 25–160, allowing flexibility in amplification and switching designs.
* Robust thermal stability and wide operating temperature range for industrial reliability.
* RoHS-compliant package suitable for surface-mount or through-hole assembly depending on variant.
Electrical Specifications
* Collector-Emitter Voltage (VCEO): 400 V maximum
* Collector-Base Voltage (VCBO): 400 V maximum
* Emitter-Base Voltage (VEBO): 5 V maximum
* Collector Current (IC): 3 A continuous
* Peak Collector Current (ICM): 6 A non-repetitive
* Collector-Emitter Saturation Voltage (VCE(sat)): 2 V typical at IC = 3 A, IB = 0.3 A
* Base-Emitter Saturation Voltage (VBE(sat)): 1.5 V typical at IC = 3 A
* DC Current Gain (hFE): 25–160 depending on collector current and VCE
* Transition Frequency (fT): 3 MHz typical at VCE = 10 V, IC = 100 mA
* Power Dissipation (PD): 40 W typical (depending on thermal management)
Thermal and Environmental Characteristics
* Operating Junction Temperature (TJ): −55°C to +150°C
* Storage Temperature (TSTG): −55°C to +150°C
* Thermal Resistance, Junction-to-Ambient (RθJA): 62.5°C/W typical
* Thermal Resistance, Junction-to-Case (RθJC): 2°C/W typical
Package Information
* Package Type: TO-220 or TO-252 variant depending on distribution
* Package Dimensions: TO-220: 10 mm × 15 mm × 4.5 mm typical
* Pin Configuration:
* Pin 1: Base
* Pin 2: Collector
* Pin 3: Emitter
* Lead Finish: RoHS-compliant tinned leads for soldering reliability
* Mounting: Through-hole (TO-220) or surface-mount (TO-252)
Applications
* Relay and solenoid driver circuits.
* Lamp and LED driver modules requiring high-voltage switching.
* Motor driver circuits for low-to-medium power applications.
* Industrial automation equipment requiring robust switching components.
* Audio amplification stages in consumer electronics.
* Power management circuits for battery-operated or mains-powered devices.
Reliability and Performance
* High voltage blocking ensures safe operation in circuits exposed to transients or higher voltage rails.
* Low saturation voltage minimizes conduction loss during switching, improving energy efficiency.
* Wide operating temperature range ensures stable performance in automotive and industrial environments.
* Complementary gain characteristics allow precise control of amplification or switching levels.
* Peak current capability and robust thermal performance enhance system reliability under transient or startup conditions.
* Standardized package types facilitate easy integration into both legacy and modern circuit boards.
Summary of Key Specifications
| Parameter | Value |
| ---------------------------------------------------------- | --------------- |
| Collector-Emitter Voltage (VCEO) | 400 V |
| Collector-Base Voltage (VCBO) | 400 V |
| Emitter-Base Voltage (VEBO) | 5 V |
| Collector Current (IC) | 3 A |
| Peak Collector Current (ICM) | 6 A |
| Collector-Emitter Saturation Voltage (VCE(sat)) | 2 V typical |
| Base-Emitter Saturation Voltage (VBE(sat)) | 1.5 V typical |
| DC Current Gain (hFE) | 25–160 |
| Transition Frequency (fT) | 3 MHz typical |
| Power Dissipation (PD) | 40 W typical |
| Operating Temperature | −55°C to +150°C |
| Package | TO-220 / TO-252 |
The BU33JA2DG-CTR provides a robust, high-voltage NPN transistor solution for medium-power switching and amplification applications. Its combination of high collector current, low saturation voltage, and wide temperature operation makes it suitable for industrial, automotive, and consumer electronic circuits requiring reliable performance under demanding electrical and thermal conditions.
