BU941ZT - 15A, 350V NPN Power Transistor | STMicroelectronics
料号： BU941ZT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.65 | $16.50 |
| 100 | $1.45 | $145.00 |
| 500 | $1.3 | $650.00 |
| 1,000 | $1.2 | $1,200.00 |
BU941ZT 概述
A power transistor is a three-terminal semiconductor device used to amplify or switch electronic signals and electrical power. In the hierarchy of power electronics, the BU941ZT is a bipolar junction transistor (BJT), which falls under the category of discrete semiconductors, specifically power transistors. BJTs are current-controlled devices where a small base current controls a larger collector current, enabling efficient power regulation and switching in circuits such as power supplies, inverters, and motor drivers.
Key features of the BU941ZT include a high collector-emitter voltage rating of 350V, a continuous collector current of 15A, and a low saturation voltage that minimizes power loss during conduction. The device also offers a high DC current gain (hFE) for efficient base drive, and a fast switching speed suitable for applications up to several kilohertz. The TO-220 package includes a metal tab for heatsinking, allowing the transistor to dissipate significant power when properly mounted.
Technically, the BU941ZT is fabricated using STMicroelectronics' advanced bipolar process, which ensures high ruggedness and reliability under stressful operating conditions. The device features a wide safe operating area (SOA) and built-in protection against overcurrent and overtemperature, making it robust for industrial environments. Its low saturation voltage (VCE(sat)) of typically 1.5V at 15A reduces conduction losses, improving overall system efficiency.
Typical applications include switch-mode power supplies (SMPS), motor control circuits, inverters, and battery chargers. In an SMPS, the BU941ZT can be used as the main switching element, handling high voltages and currents while maintaining low losses. In motor control, it drives inductive loads with fast switching and high current capability. The device is also suitable for linear regulators and audio amplifiers where high power handling is required.
When designing with the BU941ZT, ensure adequate base drive current to fully saturate the transistor and minimize power dissipation. Use a proper heatsink or thermal pad to manage the heat generated during operation, especially at high currents. Additionally, consider adding a flyback diode across inductive loads to protect the transistor from voltage spikes during switching.
直接替换替代料： BU941ZT ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
该产品暂无直接替换替代料。
请求替代料BU941ZT 最大额定值与电气特性
| 晶体管类型 | NPN |
| 集电极-发射极电压（Vceo） | 350 V |
| 集电极电流（Ic） | 15 A |
| 集电极-基极电压（Vcbo） | 400 V |
| 发射极-基极电压（Vebo） | 7 V |
| Power Dissipation (PC) | 125 W |
| DC Current Gain (hFE) | 15-75 at IC=5A, VCE=5V |
| Saturation Voltage (VCE(sat)) | 1.5 V at IC=15A, IB=3A |
| 过渡频率（ft） | 8 MHz |
| 工作温度范围 | -65C to +150C |
| 封装 | TO-220 |
| 安装类型 | Through Hole |
| RoHS 状态 | Compliant |
| MSL 等级 | 1 (unlimited) |
| Thermal Resistance (junction-case) | 1.0 C/W |
BU941ZT 引脚配置
| 引脚 1 | Base — Base terminal for controlling the transistor |
| 引脚 2 | Collector — Collector terminal, connected to the metal tab |
| 引脚 3 | Emitter — Emitter terminal |
安全工作区 (DC)
典型应用
BU941ZT 适用于 6 应用s: Switch-Mode Power Supplies (SMPS), Motor Control Circuits, Inverters, Battery Chargers, Audio Amplifiers, Industrial Power Control.
Switch-Mode Power Supplies (SMPS)
The BU941ZT is used as the main switching element in SMPS, handling high voltages up to 350V and currents up to 15A. Its low saturation voltage (1.5V) minimizes conduction losses, improving efficiency. In a typical flyback converter, the transistor switches at frequencies up to 100kHz, and its fast transition frequency (8MHz) ensures clean switching transitions. The TO-220 package allows for effective heatsinking, which is critical for managing the heat generated during high-power operation. Compared to MOSFETs, the BJT offers simpler drive circuitry and lower cost, making it a practical choice for cost-sensitive power supplies.
推荐
Motor Control Circuits
In motor control, the BU941ZT drives inductive loads with its high current capability (15A) and voltage rating (350V). It can be used in H-bridge configurations for DC motor speed control or in inverter circuits for AC motor drives. The transistor's fast switching speed (8MHz) enables PWM control at frequencies up to several kilohertz, providing smooth speed regulation. The built-in ruggedness and wide SOA protect against overcurrent and overtemperature conditions, ensuring reliable operation in industrial environments. A flyback diode is recommended across the motor terminals to suppress voltage spikes during switching.
推荐
Inverters
The BU941ZT is suitable for inverter circuits that convert DC to AC, such as in solar power systems or uninterruptible power supplies (UPS). Its high voltage (350V) and current (15A) ratings allow it to handle the power levels required in these applications. The transistor's low saturation voltage reduces power loss, improving overall inverter efficiency. In a typical full-bridge inverter, four BU941ZT transistors are used to switch the DC input at high frequency, producing a sinusoidal AC output. Proper heatsinking and gate drive design are essential to maintain reliable operation.
推荐
Battery Chargers
The BU941ZT is used in battery charger circuits to regulate charging current and voltage. Its high current capability (15A) allows it to handle fast charging applications, while its voltage rating (350V) ensures compatibility with various battery chemistries. The transistor can be used in linear or switching charger topologies, providing precise control over the charging process. In a linear charger, the transistor operates in the active region, dissipating excess power as heat, so adequate heatsinking is required. In a switching charger, the transistor operates in saturation, minimizing power loss and improving efficiency.
推荐
Audio Amplifiers
The BU941ZT can be used in audio amplifier output stages, providing high current and voltage handling for driving speakers. Its high power dissipation (125W) and low saturation voltage make it suitable for class AB amplifiers, where it operates in the linear region to reproduce audio signals with low distortion. The transistor's wide bandwidth (8MHz) ensures accurate reproduction of high-frequency audio signals. In a typical push-pull configuration, two BU941ZT transistors are used, one for the positive half-cycle and one for the negative half-cycle, with a driver stage providing the necessary base drive.
推荐
Industrial Power Control
The BU941ZT is used in industrial power control systems, such as programmable logic controllers (PLCs) and motor starters, where it switches high voltages and currents. Its ruggedness and wide SOA make it suitable for harsh industrial environments. The transistor can be used in relay replacement circuits, providing solid-state switching with faster response times and longer lifespan. In a typical application, the BU941ZT is driven by a microcontroller or PLC output, switching a 24V DC load such as a solenoid or relay. The TO-220 package allows for easy mounting on heatsinks or DIN rails.
推荐
推荐产品汇总
工程参考数据： BU941ZT ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | BU941ZP | MJ15003 | 2N3055 |
|---|---|---|---|---|
| Package | TO-220 | TO-247 | TO-3 | TO-3 |
| Brand | STMicroelectronics | STMicroelectronics | onsemi | onsemi |
| Collector-Emitter Voltage (VCEO) | 350 V | 350 V | 140 V | 60 V |
| Collector Current (IC) | 15 A | 15 A | 20 A | 15 A |
| Power Dissipation (PC) | 125 W | 150 W | 200 W | 115 W |
| DC Current Gain (hFE) | 15-75 | 15-75 | 20-100 | 20-70 |
| Saturation Voltage (VCE(sat)) | 1.5 V | 1.5 V | 1.0 V | 1.1 V |
| Transition Frequency (fT) | 8 MHz | 8 MHz | 2 MHz | 2.5 MHz |
关键差异点
- High voltage rating of 350V （对比 2N3055)
- Low saturation voltage of 1.5V （对比 MJ15003)
- Fast transition frequency of 8MHz （对比 MJ15003)
设计说明
The BU941ZT dissipates up to 125W, requiring a heatsink with a thermal resistance of less than 1.0 C/W to keep the junction temperature below 150C. Use thermal paste and a mica insulator if mounting on a grounded heatsink. For continuous operation at 15A and 350V, ensure the heatsink is adequately sized and ventilated.
Ensure the base drive current is sufficient to saturate the transistor. At IC=15A, a base current of at least 3A is required to achieve VCE(sat) of 1.5V. Insufficient base drive will cause the transistor to operate in the active region, leading to excessive power dissipation and potential thermal runaway. Use a base resistor or driver circuit to provide the required current.
For switching inductive loads, place a flyback diode (e.g., 1N4007) across the load to clamp voltage spikes. Keep the base drive circuit close to the transistor to minimize parasitic inductance. Use wide PCB traces for the collector and emitter connections to handle high currents and reduce voltage drops.
合规信息
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified.
