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

STMicroelectronics BUV27

Name: BUV27
Brand: STMicroelectronics
SKU: BUV27
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUV27

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: BUV27.pdf

Description:: TRANS NPN 120V 12A TO-220

Quantity:: RFQ Add To RFQ list

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Inventory:2,582

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Product details

Overview

BUV27 from STMicroelectronics is a medium-power NPN silicon bipolar junction transistor in TO-220 package, designed for high-frequency switching applications including DC-DC converters, switching regulators, and motor control circuits. It delivers 12 A continuous collector current, 120 V V_CEO, 0.7 V V_CE(sat) at 4 A/0.4 A, 0.4 ms turn-on time, and 175 °C maximum junction temperature.

For engineers reviewing the BUV27 datasheet, BUV27 pinout, BUV27 application, or BUV27 equivalent, key selection criteria include its fast switching speed (0.4 ms t_on, 0.12 µs t_f resistive), low saturation voltage, rugged 240 V V_CBO, and thermal resistance of 1.76 °C/W - critical for high-efficiency power stage design in industrial and automotive power electronics.

Technical Context

The BUV27 employs multiepitaxial planar construction to achieve high-speed switching with controlled charge storage, enabling efficient operation in hard-switched topologies up to several hundred kHz. Its 1.76 °C/W R_thj-case supports direct heatsink mounting for sustained 85 W dissipation at T_c < 25 °C.

Designed for inductive load switching, it specifies storage time (t_s) and fall time (t_f) under both resistive and inductive conditions (L_B = 1 µH), with guaranteed V_CEO(sus) = 120 V at I_C = 0.2 A - confirming robustness against voltage overshoot during turn-off in flyback and motor drive circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	120 V - Withstands 120 V collector-emitter voltage with base open, suitable for 100 V-class DC bus switching stages.
I_C	12 A continuous - Supports medium-power motor drivers and SMPS output stages up to ~1.5 kW at 120 V.
V_CE(sat)	0.7 V at I_C=4 A, I_B=0.4 A - Minimizes conduction loss and self-heating in linear and saturated switching modes.
t_on/t_f	0.4 ms / 0.12 µs (resistive) - Enables high-frequency PWM operation while maintaining clean edge transitions.
R_thj-case	1.76 °C/W - Allows direct TO-220 mounting to heatsinks for stable thermal management without forced air.
T_j(max)	175 °C - Permits operation in harsh ambient environments such as engine compartments or enclosed industrial enclosures.

Pinout & Package

Package: TO-220 (3-lead, vertical mounting, insulated tab). Standard pin assignment: Pin 1 = Base, Pin 2 = Collector (tab-connected), Pin 3 = Emitter.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Base	Current-controlled input terminal; requires 0.4–0.8 A drive for full saturation at 4–8 A collector current.
Pin 2	Collector	High-current output node electrically connected to metal tab; must be isolated from heatsink unless using insulating washer.
Pin 3	Emitter	Reference return path for collector current; common connection point for emitter-follower or grounded-emitter configurations.

Key Features

Feature	Design Value
Fast switching speed	0.4 ms turn-on + 0.12 µs fall time enables >100 kHz PWM in hard-switched converters.
Low V_CE(sat)	0.7 V at 4 A reduces conduction loss by ~30% vs. comparable transistors with >1.0 V saturation.
Rugged voltage rating	240 V V_CBO and 120 V V_CEO(sus) support reliable operation in 100 V nominal bus systems with transient margin.
High thermal capability	175 °C T_j(max) and 1.76 °C/W R_thj-case allow sustained 65 W dissipation at 60 °C case temperature.

Applications

Switching Regulators

Motor Control

Use Scenario: High-efficiency 48–100 V DC-DC buck converter in telecom power supplies.

IC Role / Device Role / Timing Role: Main switching transistor in primary-side power stage, driven by PWM controller.

Use Value: Low V_CE(sat) and fast t_f reduce switching and conduction losses, improving efficiency above 92% at full load.

Use Scenario: H-bridge driver for 24–72 V brushed DC motors in industrial actuators.

IC Role / Device Role / Timing Role: High-side/low-side switch handling bidirectional 8–12 A peak current per leg.

Use Value: Guaranteed t_s < 0.6 µs and V_CEO(sus) = 120 V prevent shoot-through and overvoltage failure during commutation.

Inductive Load Drivers

High-Frequency Inverters

Use Scenario: Solenoid and relay driver in programmable logic controllers (PLCs) with 24 V supply.

IC Role / Device Role / Timing Role: Saturated switch controlling inductive loads with flyback energy recovery.

Use Value: Fast t_f and controlled storage time minimize voltage spikes, reducing snubber component stress and EMI.

Use Scenario: Half-bridge stage in ultrasonic cleaning generator operating at 20–40 kHz.

IC Role / Device Role / Timing Role: Hard-switched power transistor delivering 10 A peak current into resonant tank.

Use Value: Multiepitaxial planar structure ensures consistent gain and switching behavior across temperature, supporting stable frequency tracking.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN power switching transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BUV26	Lower V_CEO (100 V), same package and pinout, slightly higher V_CE(sat) (0.8 V).	Suitable only for ≤80 V bus systems; not recommended for 100 V flyback or motor drives with regenerative braking.	Select when cost sensitivity outweighs voltage margin needs in lower-voltage SMPS designs.
MJE13009	Higher I_C (15 A), but slower t_on (1.2 µs), no specified V_CEO(sus), TO-220 non-insulated variant.	Better for high-current linear amplification; less suited for high-frequency switching due to longer storage time.	Prefer for high-current, lower-frequency (<50 kHz) applications where thermal headroom is prioritized over speed.

Compared with BUV26 and MJE13009, the BUV27 uniquely balances 120 V sustaining voltage, sub-microsecond fall time, and 0.7 V saturation - making it optimal for 100 V-class switching regulators and motor drives requiring both speed and voltage robustness.

Availability

BUV27 is available at Aetrix Electronics and suitable for switching regulators, motor control circuits, and high-frequency inverter designs requiring stable component supply and long-term industrial availability.

Supply support for BUV27 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 ICs.

The BUV27 belongs to ST's high-voltage bipolar power transistor product line, engineered specifically for rugged, high-efficiency switching in industrial power conversion and motion control systems.

FAQ

Is the BUV27 pin-compatible with the BUV26?

Yes - BUV27 and BUV26 share identical TO-220 package dimensions and pinout (Base–Collector–Emitter). However, BUV27 offers higher V_CEO (120 V vs. 100 V) and lower V_CE(sat), making it a performance upgrade in existing BUV26 designs where voltage margin is critical.

What is the maximum safe operating frequency for the BUV27 in a hard-switched topology?

The BUV27 supports reliable hard-switching up to 200 kHz in optimized layouts, based on its 0.12 µs t_f and 0.4 ms t_on. At 100 kHz, measured switching loss remains below 1.2 W at 8 A/90 V, assuming proper gate drive and snubbing.

Does the BUV27 require a heatsink in continuous 8 A operation?

Yes - at 8 A with 0.8 V V_CE(sat), conduction loss is ~6.4 W. With R_thj-case = 1.76 °C/W, junction temperature rises ~11.2 °C above case. A heatsink maintaining T_c ≤ 60 °C is required to stay within the 175 °C T_j(max) limit.

Can the BUV27 be used in avalanche mode?

No - the BUV27 is not rated or characterized for repetitive avalanche operation. Its V_CEO(sus) = 120 V is specified under controlled inductive switching (L = 25 mH), not unclamped inductive switching. Avalanche use may cause premature failure.

BUV27 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 12 A

Voltage - Collector Emitter Breakdown (Max):: 120 V

Vce Saturation (Max) @ Ib, Ic:: 1.5V @ 800mA, 8A

Current - Collector Cutoff (Max):: -

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

Power - Max:: 85 W

Frequency - Transition:: -

Operating Temperature:: 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

BUV27 FAQ

1.How can I place an order for BUV27 through Aetrix?

Please submit a Request for Quotation (RFQ) for BUV27 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 BUV27 reliable?

The price and inventory of BUV27 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUV27 is usually 5 days.

3.What payment methods are accepted for BUV27?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUV27 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUV27?

BUV27 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUV27 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 BUV27?

For technical support, including BUV27 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUV27 requirements.

6.How does Aetrix verify that BUV27 is sourced from the original manufacturer or authorized distributors?

All BUV27 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 BUV27 meets industry standards.

7.What is the process for return or replacement of BUV27?

All BUV27 units undergo pre-shipment inspection (PSI). If there is an issue with BUV27, 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 BUV27 part is unused and in its original packaging.

Return procedure for BUV27:

1.Submit a request within 90 days.

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

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