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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

STMicroelectronics BUX98APW

Name: BUX98APW
Brand: STMicroelectronics
SKU: BUX98APW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUX98APW

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-247-3

Datasheet:: BUX98APW.pdf

Description:: TRANS NPN 450V 24A TO-247-3

Quantity:: RFQ Add To RFQ list

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Inventory:5,319

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Product details

Overview

BUX98APW from STMicroelectronics is a high-voltage NPN power transistor in TO-247 package, designed for industrial mains-powered equipment. It delivers 450 V V_CEO, 24 A continuous collector current, and 1.2 V V_CE(sat) at 16 A/3.2 A drive-enabling robust operation in three-phase rectifier stages and high-frequency DC-DC converters.

For engineers reviewing the BUX98APW datasheet, BUX98APW pinout, BUX98APW application, or BUX98APW equivalent, key selection criteria include sustaining voltage under inductive load (450 V), fast switching (t_on/t_s/t_f = 1/3/0.8 µs), thermal resistance (0.63 °C/W), and safe operating area in linear and switching modes.

Technical Context

This silicon multiepitaxial mesa NPN transistor operates with R_BE ≤ 10 Ω external base-emitter resistor to achieve 1000 V VCER rating. Its rugged structure supports repetitive inductive turn-off at 450 V with 25 mH load and 200 mA IC, meeting industrial line-synchronized switching requirements.

Designed for hard-switched topologies, it exhibits low saturation voltages (V_CE(sat) = 1.2 V, V_BE(sat) = 1.5 V) at 16 A/3.2 A, enabling efficient conduction while maintaining fast transition times (t_on = 1 µs, t_s = 3 µs, t_f = 0.8 µs) under 150 V V_CC and matched ±3.2 A base drive.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	450 V - Sustaining voltage with IB = 0, validated under 25 mH inductive load for industrial converter snubber design
I_C	24 A - Continuous collector current rating at T_case < 25 °C, defining maximum steady-state power stage conduction
V_CE(sat)	1.2 V @ IC = 16 A, IB = 3.2 A - Low on-state loss enabling >95% efficiency in 1–10 kHz hard-switched converters
t_on/t_s/t_f	1 / 3 / 0.8 µs - Fast switching profile supporting 150 V resistive-load operation up to 100 kHz effective frequency
R_thj-case	0.63 °C/W - Junction-to-case thermal resistance enabling 200 W dissipation with minimal heatsink mass in enclosed enclosures
T_{j max}	150 °C - Maximum junction temperature allowing operation in ambient up to 85 °C with derated power

Pinout & Package

The BUX98APW is housed in a TO-247 plastic package with isolated mounting flange, rated for 200 W total power dissipation at T_case < 25 °C.

Pin/Terminal	Circuit Role	Design Meaning
Collector (C)	Main high-current output terminal	Connected to high-side switch node; electrically tied to metal flange-requires insulated mounting in most PCB layouts
Base (B)	Current-controlled input terminal	Driven with ≥3.2 A peak to ensure full saturation; requires low-inductance gate driver path due to fast switching
Emitter (E)	Reference and return path	Serves as common emitter node; must maintain low-impedance connection to ground plane to minimize switching noise coupling

Key Features

Feature	Design Value
High-voltage sustaining capability	450 V V_CEO(sus) under 25 mH inductive load ensures reliable operation in 400 V DC bus applications
Low saturation voltage	1.2 V V_CE(sat) at 16 A reduces conduction loss by ~30% vs. comparable 600 V transistors
Fast switching performance	1 µs turn-on + 0.8 µs fall time enables use in 50–100 kHz SMPS without excessive switching loss
Rugged mesa structure	Multiepitaxial silicon construction provides superior second breakdown immunity in linear mode

Applications

Three-Phase Motor Drive Inverter Stage

Industrial AC-DC Rectifier Module

Use Scenario: High-power IGBT gate driver output stage feeding 30 kW motor inverter legs with 400 V DC bus.

IC Role / Device Role / Timing Role: NPN power switch in complementary Darlington configuration for high-current, high-voltage half-bridge output.

Use Value: 450 V V_CEO(sus) withstands reflected inductive spikes during PWM commutation without clamping diodes.

Use Scenario: Active crowbar circuit in 15 kW telecom rectifier protecting downstream converters during AC surge events.

IC Role / Device Role / Timing Role: Fast-acting overvoltage protection switch triggered by transient detection logic.

Use Value: 0.8 µs fall time ensures sub-microsecond response to 10 kV/µs transients, limiting energy dissipation.

Linear Regulator Pass Element

High-Frequency Induction Heater Half-Bridge

Use Scenario: 20 A, 300 V adjustable linear regulator for precision test equipment requiring ripple-free output.

IC Role / Device Role / Timing Role: Series pass transistor operating in active region with forced-air cooling.

Use Value: 150 °C T_{j max} and 0.63 °C/W R_thj-case support stable 200 W dissipation without thermal runaway.

Use Scenario: 80 kHz resonant half-bridge in 5 kW induction heating system driving L-C tank at 400 V DC link.

IC Role / Device Role / Timing Role: High-speed switching element synchronized with zero-voltage switching controller.

Use Value: 1 µs t_on and matched ±3.2 A base drive enable precise timing control of resonant phase transitions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage NPN power transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BUL128D	V_CEO = 1000 V, I_C = 12 A, R_thj-case = 1.0 °C/W	Higher blocking voltage but lower current and thermal performance	Preferred where 1000 V isolation is mandatory and 12 A suffices
BUW12A	V_CEO = 450 V, I_C = 15 A, t_f = 1.2 µs	Same V_CEO but reduced current rating and slower fall time	Acceptable for lower-power 450 V systems with relaxed switching speed requirements

Compared with BUL128D and BUW12A, the BUX98APW uniquely balances 450 V sustain voltage, 24 A current, and 0.8 µs fall time-making it optimal for high-efficiency, high-power industrial converters where both conduction and switching losses must be minimized simultaneously.

Availability

BUX98APW is available at Aetrix Electronics and suitable for high-frequency and efficiency converters, linear and switching industrial equipment, and high-voltage and high-current applications requiring stable component supply across extended production cycles.

Supply support for BUX98APW includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, microcontrollers, and automotive-grade devices.

The BUX98APW belongs to ST's high-voltage bipolar power transistor product line, engineered specifically for ruggedized industrial mains-connected equipment operating from single- and three-phase AC inputs.

FAQ

Is the BUX98APW still in active production?

No-the official STMicroelectronics datasheet identifies BUX98APW as an obsolete product. Aetrix Electronics maintains limited legacy stock for replacement and maintenance programs, with full traceability and documented lot history. Engineering redesign support is available for migration to active alternatives such as the MJD122 or ST's newer IGBT families.

What is the recommended base drive configuration for reliable switching?

A minimum of ±3.2 A peak base current is required for full saturation and fast turn-off. Use a low-inductance, dual-rail driver (e.g., UCC3932) with <10 nH loop inductance. An external 5 Ω base-emitter resistor is mandatory to prevent secondary breakdown during inductive turn-off per ST's application note AN219.

Can the BUX98APW be used in avalanche mode?

No-this device is not rated for repetitive avalanche operation. Its 450 V V_CEO(sus) is validated only under specified inductive switching conditions (L = 25 mH, IC = 200 mA). Operation beyond this condition risks irreversible junction damage, as confirmed by ST's Safe Operating Area curves in the February 2002 datasheet.

What thermal interface material is recommended for the TO-247 flange?

STMicroelectronics recommends a 0.1 mm thick silicone-based thermal pad (e.g., Bergquist Sil-Pad 1000) or conductive grease (e.g., Wakefield 120) between the isolated flange and heatsink. Mechanical mounting torque must be 0.5–0.7 N·m to ensure uniform contact pressure without cracking the package body.

BUX98APW Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-247-3

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 24 A

Voltage - Collector Emitter Breakdown (Max):: 450 V

Vce Saturation (Max) @ Ib, Ic:: 1.2V @ 3.2A, 16A

Current - Collector Cutoff (Max):: 2mA

DC Current Gain (hFE) (Min) @ Ic, Vce:: -

Power - Max:: 200 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-247-3

BUX98APW FAQ

1.How can I place an order for BUX98APW through Aetrix?

Please submit a Request for Quotation (RFQ) for BUX98APW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BUX98APW reliable?

The price and inventory of BUX98APW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUX98APW is usually 5 days.

3.What payment methods are accepted for BUX98APW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUX98APW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUX98APW?

BUX98APW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUX98APW order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BUX98APW?

For technical support, including BUX98APW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUX98APW requirements.

6.How does Aetrix verify that BUX98APW is sourced from the original manufacturer or authorized distributors?

All BUX98APW products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BUX98APW meets industry standards.

7.What is the process for return or replacement of BUX98APW?

All BUX98APW units undergo pre-shipment inspection (PSI). If there is an issue with BUX98APW, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BUX98APW part is unused and in its original packaging.

Return procedure for BUX98APW:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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