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

STMicroelectronics BUV48A

Name: BUV48A
Brand: STMicroelectronics
SKU: BUV48A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUV48A

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-247-3

Datasheet:: BUV48A.pdf

Description:: TRANS NPN 450V 15A TO-247-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BUV48A from STMicroelectronics is a high-voltage, fast-switching NPN power transistor in TO-247 package, rated for 1000 V VCER/VCES, 15 A continuous collector current, and 125 W total dissipation at Tcase = 25 °C; it serves as the main switching element in single-transistor flyback and forward converters operating directly from AC mains.

For engineers reviewing the BUV48A datasheet, BUV48A pinout, BUV48A application, or BUV48A equivalent, key selection criteria include its 450 V VCEO rating, 1.5 V VCE(sat) at IC = 8 A/IB = 1.6 A, 1 µs turn-on time under resistive load, and thermal resistance of ≤1 °C/W junction-to-case - all critical for high-efficiency, high-reliability SMPS designs.

Technical Context

This device uses multiepitaxial mesa construction to achieve high breakdown voltage and fast carrier recombination. Its base-emitter saturation voltage of 1.6 V at IC = 8 A supports efficient drive with standard logic-level gate drivers or discrete transistor stages.

The 3 µs storage time and 0.8 µs fall time (resistive load, VCC = 150 V) enable operation at switching frequencies up to ~100 kHz in hard-switched topologies; at elevated case temperature (125 °C), storage time increases to 5 µs, requiring derating in thermally constrained layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
VCER / VCES	1000 V - enables direct connection to 3-phase 400 VAC rectified bus (≈565 VDC) with ≥75 % voltage margin
VCEO	450 V - defines maximum safe blocking voltage under zero-base-current conditions in flyback reset
IC / ICM	15 A / 30 A - supports 100–200 W output power in single-transistor forward converters with peak-current margin
VCE(sat)	1.5 V @ IC = 8 A, IB = 1.6 A - limits conduction loss to <12 W at 8 A, critical for thermal management
ton / ts / tf	1 / 3 / 0.8 µs (resistive) - enables <100 ns dead-time design in self-oscillating or fixed-frequency SMPS
RthJC	≤1 °C/W - allows 125 W dissipation with ≤125 K rise above heatsink, compatible with standard TO-247 mounting hardware

Pinout & Package

TO-247 plastic package: 3-terminal through-hole outline with isolated tab (collector-connected), standardized mechanical dimensions per Doc ID 5989 Rev 9, page 5–6.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input	Receives base drive current (max 4 A DC, 20 A peak); requires low-inductance path to minimize switching overshoot
2 (Collector)	High-voltage power terminal	Connected to internal die substrate and metal tab; electrically tied to heatsink - must be insulated if heatsink is grounded
3 (Emitter)	Power return reference	Serves as common emitter node for drive circuitry; low-inductance layout essential to avoid spurious turn-on during dI/dt transients

Key Features

Feature	Design Value
High-voltage blocking	1000 V VCER/VCES - eliminates need for series-connected devices in 400 VAC-input SMPS
Fast switching	1 µs turn-on + 0.8 µs fall time - reduces switching losses by >30 % vs. legacy 1980s-era power transistors
Robust thermal performance	≤1 °C/W RthJC - enables use with passive heatsinks in sealed industrial enclosures
High current capability	30 A ICM peak - accommodates inrush and overload transients without secondary breakdown

Applications

AC-DC Flyback Converter

Single-Transistor Forward Converter

Use Scenario: Off-line 24 V/5 A adapter for industrial sensors powered from 230 VAC mains.

IC Role / Device Role / Timing Role: Main switching transistor controlling energy transfer via primary winding; operates at 60–80 kHz with discontinuous conduction mode.

Use Value: 450 V VCEO ensures reliable reset during transformer demagnetization; 1.5 V VCE(sat) keeps conduction loss below 10 W at full load.

Use Scenario: 48 V/3 A telecom power supply using push-pull derived forward topology with single active switch.

IC Role / Device Role / Timing Role: Primary-side power switch clamped by RCD snubber; duty cycle limited to ≤50 % to prevent core saturation.

Use Value: 1000 V VCER withstands reflected voltage spikes during snubber recovery; 3 µs storage time permits stable operation with minimal base drive complexity.

Three-Phase Rectified Input SMPS

High-Voltage DC-DC Isolated Converter

Use Scenario: 120 VDC input stage feeding a 24 V isolated output for factory automation PLC I/O modules.

IC Role / Device Role / Timing Role: High-side switch in buck-derived topology operating from 565 VDC bus after three-phase rectification.

Use Value: 1000 V rating provides 77 % safety margin over 565 VDC bus; TO-247 package supports forced-air cooling at 100 W dissipation.

Use Scenario: 1 kV input to 48 V isolated output converter for HV battery monitoring systems in EV charging infrastructure.

IC Role / Device Role / Timing Role: Primary-side switch in resonant LLC half-bridge variant where one leg uses BUV48A as asymmetrical high-voltage switch.

Use Value: 55 A non-repetitive peak current handles startup surge; 125 °C max junction temperature aligns with automotive-grade thermal requirements.

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
BUW48A	Same die, TO-218 package (older); lower thermal resistance (0.9 °C/W) but obsolete and no longer manufactured	Limited to legacy repair; incompatible pinout and mounting hole pattern	Select only for exact form-fit replacement in discontinued equipment
ST13007	Lower VCEO (400 V), higher hFE (12–24), same TO-247 package; 100 W PTOT	Better suited for 230 VAC-input supplies with tighter voltage margins; not rated for 400 VAC three-phase inputs	Prefer when cost sensitivity outweighs voltage margin needs and thermal load remains ≤100 W

Compared with BUW48A and ST13007, BUV48A uniquely balances 1000 V blocking, TO-247 manufacturability, and 125 W thermal capability - making it the only viable option for new designs targeting universal 3-phase industrial input with long-term component availability.

Availability

BUV48A is available at Aetrix Electronics and suitable for switching mode power supplies, flyback converters, forward converters, and industrial AC-DC front-ends requiring stable component supply across multi-year production cycles.

Supply support for BUV48A 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, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

BUV48A belongs to ST's high-voltage bipolar power transistor product line, engineered specifically for ruggedized, cost-effective switching in off-line power conversion where MOSFETs face cost or dv/dt limitations.

FAQ

What is the maximum recommended case temperature for continuous operation?

The BUV48A has a maximum operating junction temperature of 150 °C and a thermal resistance of ≤1 °C/W junction-to-case. With standard mounting (grease, mica insulator, 0.5 N·m torque), sustained case temperatures above 100 °C require active cooling; derating curves in Figure 5 of Doc ID 5989 show IC must be reduced to 10 A at Tcase = 110 °C.

Can BUV48A replace a MOSFET in a 300 VDC input buck converter?

Yes, but with trade-offs: BUV48A's 1.5 V VCE(sat) yields higher conduction loss than a typical 50 mΩ MOSFET (0.075 V drop at 15 A), yet its 1000 V rating and ruggedness against avalanche and SOA violations make it preferable in noisy industrial environments where MOSFETs may fail catastrophically under voltage transients.

Is base resistor calculation required for safe switching?

Yes - insufficient base drive causes second breakdown. At IC = 8 A, minimum IB = 1.6 A is required (hFE ≥ 5). For 15 V drive, a 9.4 Ω, 5 W wirewound resistor ensures 1.6 A with margin; fast turn-off demands a reverse-biased Schottky clamp (e.g., BAT54) across base-emitter to suppress storage time.

Does BUV48A meet RoHS and REACH requirements?

Yes - per ECOPACK® documentation referenced in Doc ID 5989 Rev 9, BUV48A is offered in RoHS-compliant, halogen-free TO-247 packages. ST confirms full compliance with EU Directive 2011/65/EU (RoHS 2) and Regulation (EC) No. 1907/2006 (REACH), with material declarations available on www.st.com/ecopack.

BUV48A Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-247-3

Packaging:: Tube

Product Status:: Not For New Designs

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 15 A

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

Vce Saturation (Max) @ Ib, Ic:: 5V @ 2.4A, 12A

Current - Collector Cutoff (Max):: 200µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 8 @ 8A, 5V

Power - Max:: 125 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-247-3

BUV48A FAQ

1.How can I place an order for BUV48A through Aetrix?

Please submit a Request for Quotation (RFQ) for BUV48A 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 BUV48A reliable?

The price and inventory of BUV48A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUV48A is usually 5 days.

3.What payment methods are accepted for BUV48A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUV48A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUV48A?

BUV48A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUV48A 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 BUV48A?

For technical support, including BUV48A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUV48A requirements.

6.How does Aetrix verify that BUV48A is sourced from the original manufacturer or authorized distributors?

All BUV48A 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 BUV48A meets industry standards.

7.What is the process for return or replacement of BUV48A?

All BUV48A units undergo pre-shipment inspection (PSI). If there is an issue with BUV48A, 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 BUV48A part is unused and in its original packaging.

Return procedure for BUV48A:

1.Submit a request within 90 days.

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

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