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BUX85 The BUX85 is an NPN silicon power transistor designed for high voltage, high speed switching applications. Key specs: 450V VCEO(sus), 2A continuous collector current, 50W power dissipation in TO-220 package.
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BUX85

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Mfr Name: On Semiconductor
On Semiconductor
The BUX85 is an NPN silicon power transistor designed for high voltage, high speed switching applications. Key specs: 450V VCEO(sus), 2A continuous collector current, 50W power dissipation in TO-220 package.
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BUX85 Available from 1 distributor

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BUX85 Specifications Quick View

Most important parameters for selection – full specs in datasheet.
Category
Manufacturer Name
Current
DC Current Gain (hFE) (Min) @ Ic, Vce
Frequency
Mounting Type
Operating Temperature
Power
Storage Temperature
Supplier Device Package
Tape & Reel
Transistor Type
Vce Saturation (Max) @ Ib, Ic
Voltage
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BUX85 Description

Short technical summary and product information.

The BUX85 is an NPN silicon power transistor from onsemi, designed for high voltage, high speed power switching applications such as converters, inverters, switching regulators, and motor control systems. It features a collector-emitter sustaining voltage (VCEO(sus)) of 450V and a maximum collector-emitter voltage (VCES) of 1000V.

 

The device supports a continuous collector current of 2A with a peak current of 3A. DC current gain (hFE) is 30 minimum and 50 typical at 100mA, 5V. Saturation voltages are low: VCE(sat) of 0.8V at 0.3A and 1V at 1A. Transition frequency is 4MHz minimum.

 

The BUX85 is housed in a TO-220 through-hole package (CASE 221A) and is Pb-free and RoHS compliant. Thermal resistance junction-to-case is 2.5°C/W, allowing 50W dissipation at 25°C case temperature. Operating junction temperature range is -65°C to 150°C.

BUX85 Quick Information

Product Type: Bipolar (BJT) Single Transistor
Canonical Name: BUX85 NPN Silicon Power Transistor
Subcategory: Power Transistor

BUX85 Compliance

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

BUX85 Features

  • 450V collector-emitter sustaining voltage.
  • 2A continuous collector current rating.
  • 50W power dissipation at 25°C case.
  • Fast switching with 4MHz transition frequency.
  • RoHS compliant and Pb-free TO-220 package.

BUX85 Applications

  • Used in switch-mode power supplies and converters.
  • Ideal for motor control and inverter circuits.
  • Suitable for high voltage switching regulators.
  • Applied in industrial power switching systems.

BUX85 FAQs

7 frequently asked questions generated from this part’s specifications.
What is the collector-emitter sustaining voltage of the BUX85?

The minimum collector-emitter sustaining voltage (VCEO(sus)) is 450V.

What is the maximum collector current rating?

Continuous collector current is 2A, with a peak current of 3A (pulse test: 5ms, duty cycle ≤10%).

What is the power dissipation of the BUX85?

Maximum power dissipation is 50W at case temperature 25°C, derated above 25°C at 0.4 W/°C.

What package does the BUX85 come in?

The BUX85 is available in a TO-220 (TO-220-3) through-hole package.

What is the operating temperature range?

The operating and storage junction temperature range is -65°C to 150°C.

Is the BUX85 RoHS compliant?

Yes, the datasheet states the device is Pb-free and RoHS compliant.

What is the DC current gain (hFE) of the BUX85?

At Ic=100mA and Vce=5V, the DC current gain is 30 minimum and 50 typical.

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