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BUX48 The BUX48 is a high power NPN silicon transistor from STMicroelectronics, rated for 400V collector-emitter voltage and 15A collector current. It is designed for switching applications and comes in a TO-3 chassis mount package.
Mfr Part #:

BUX48

Available from 2 distributors
Mfr Name: STMicroelectronics
STMicroelectronics
The BUX48 is a high power NPN silicon transistor from STMicroelectronics, rated for 400V collector-emitter voltage and 15A collector current. It is designed for switching applications and comes in a TO-3 chassis mount package.
✓ Total Stock: 4 pcs
$ Price Range: $3.93

BUX48 Available from 2 distributors

✓ Authorised
✓ Non-Authorised
Distributor Stock Pricing MOQ PKG Lead Time Date Code On Order Quantity On Order Delivery
Partservice ✓
Non-Authorised Inventory information
3 pcs
On Request
3 pcs On Request 1 On Request On Request On Request On Request On Request
Chanetech ✓
Non-Authorised Inventory information
1 pcs
On Request
1 pcs On Request 1 On Request On Request On Request On Request On Request
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BUX48 Specifications Quick View

Most important parameters for selection – full specs in datasheet.
Category
Manufacturer Name
Current
Mounting Type
Operating Temperature
Power
Storage Temperature
Supplier Device Package
Tape & Reel
Transistor Type
Vce Saturation (Max) @ Ib, Ic
Voltage
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BUX48 Description

Short technical summary and product information.

The BUX48 is a high power NPN silicon transistor from STMicroelectronics, intended for switching and industrial applications from single and three-phase mains. It features a collector-emitter voltage (VCEO) of 400V, collector current (IC) of 15A continuous (30A peak, 55A non-repetitive peak), and a maximum power dissipation of 175W at case temperature 25°C. The device offers fast switching with typical turn-on time of 1µs, storage time of 3µs, and fall time of 0.8µs. It is housed in a TO-3 metal package (TO-204AA equivalent) with chassis mount termination. The maximum junction temperature is 200°C, and thermal resistance junction-to-case is 1°C/W. The transistor is suitable for switch mode power supplies, flyback and forward converters, and other industrial power circuits.

BUX48 Quick Information

Product Type: Transistor - Bipolar (BJT) - Single
Canonical Name: STMicroelectronics BUX48 NPN Silicon Power Transistor
Subcategory: Single NPN Power Transistor

BUX48 Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected

BUX48 Estimated Pricing

Qty Low High
200+ $3.93 $3.93

Estimated market price range - modelled values for guidance only, not live distributor offers.

BUX48 Features

  • NPN silicon power transistor rated for 400V VCEO.
  • Collector current up to 15A continuous, 30A peak.
  • 175W power dissipation at case temperature 25°C.
  • Fast switching with 1µs turn-on time.
  • Chassis mount TO-3 metal package.

BUX48 Applications

  • Used in switch mode power supplies (SMPS).
  • Suitable for flyback and forward converters.
  • Ideal for industrial power switching from mains.
  • Applicable in high voltage inverter circuits.

BUX48 FAQs

7 frequently asked questions generated from this part’s specifications.
What is the collector-emitter voltage rating of the BUX48?

The BUX48 has a collector-emitter voltage (VCEO) of 400V, with a sustaining voltage of 400V minimum.

What is the maximum collector current of the BUX48?

The maximum continuous collector current (IC) is 15A, with peak current (ICM) of 30A and non-repetitive peak (ICP) of 55A.

What is the power dissipation of the BUX48?

The maximum power dissipation is 175W at case temperature 25°C.

What package is the BUX48 available in?

The BUX48 is available in a TO-3 metal package (TO-204AA) for chassis mount installation.

What is the operating temperature range of the BUX48?

The maximum junction temperature (TJ) is 200°C, and the storage temperature range is -65 to 200°C.

Is the BUX48 RoHS compliant?

The BUX48 is listed as RoHS3 compliant, but this status is unverified and should be confirmed with the manufacturer.

What are the switching speeds of the BUX48?

Typical switching times are: turn-on time 1µs, storage time 3µs, and fall time 0.8µs (tested at VCC=150V, IC=10A, IB1=2A).

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