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Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > FETs, MOSFETs

STMicroelectronics BUZ10

Name: BUZ10
Brand: STMicroelectronics
SKU: BUZ10
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUZ10

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: BUZ10.pdf

Description:: MOSFET N-CH 50V 23A TO220AB

Quantity:: RFQ Add To RFQ list

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Inventory:9,655

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Product details

Overview

BUZ10 from STMicroelectronics is an N-channel enhancement-mode power MOSFET in TO-220 package, designed for high-current switching in automotive and industrial power stages. It delivers 23 A continuous drain current, 50 V V_DS, typical R_DS(on) of 0.06 Ω at V_GS = 10 V, and 175 °C maximum junction temperature - enabling robust solenoid drivers and DC-DC converter primary-side switches.

For engineers reviewing the BUZ10 datasheet, BUZ10 pinout, BUZ10 application, or BUZ10 equivalent, key selection considerations include avalanche ruggedness (100% tested), unclamped inductive switching capability (E_AS = 150 mJ), gate threshold voltage range (2.1–4 V), and thermal resistance (R_thj-case = 2.0 °C/W) for heatsink-limited designs.

Technical Context

The BUZ10 employs ST's StripFET™ process to achieve low on-resistance and high current density in a standard through-hole TO-220 package. Its avalanche-rated structure supports repetitive unclamped inductive switching without external snubbers, with validated E_AS = 150 mJ at T_j = 25 °C and I_AR = 10 A.

Dynamic performance includes t_d(on) = 20 ns, t_r = 45 ns, t_d(off) = 48 ns, and t_f = 10 ns under resistive-load conditions (V_DD = 30 V, I_D = 10 A, R_GS = 4.7 Ω), supporting high-frequency PWM control up to ~1 MHz in hard-switched topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	50 V - Maximum blocking voltage for 12–24 V automotive and industrial bus applications
R_DS(on)	0.06 Ω (typ.) at V_GS = 10 V - Enables <1.4 W conduction loss at 23 A, reducing heatsink requirements
I_D (cont)	23 A at T_c = 25 °C - Supports high-current loads like fuel injectors and ABS actuators
E_AS	150 mJ - Confirmed single-pulse avalanche energy for reliable inductive turn-off without clamping
R_thj-case	2.0 °C/W - Allows direct mounting to heatsinks with predictable thermal rise under full load
V_GS(th)	2.1–4.0 V - Compatible with 3.3 V and 5 V logic-level gate drivers when used with sufficient drive strength
C_iss	900 pF - Determines gate drive power requirement and switching speed sensitivity to gate resistance

Pinout & Package

TO-220 package with isolated tab (drain-connected), 3-pin vertical lead configuration. Mounting hole centered on tab for mechanical stability and thermal interface.

Pin/Terminal	Circuit Role	Design Meaning
1 (Source)	Power return path for load current	Low-inductance connection point for PCB ground plane or source return trace
2 (Gate)	Control terminal for channel conduction	High-impedance input requiring <100 nA leakage; sensitive to ESD and layout-induced ringing
3 (Drain)	Main power output / high-side switch node	Internally connected to metal tab - electrically active and thermally critical; requires isolation if mounted to heatsink

Key Features

Feature	Design Value
Avalanche ruggedness	100% production-tested to 10 A repetitive avalanche current and 150 mJ single-pulse energy
High-temperature operation	Rated for continuous operation up to 175 °C junction temperature - suitable for under-hood automotive environments
Low R_DS(on)	0.06 Ω typ. enables <1.5 W conduction loss at 23 A, minimizing thermal derating in compact layouts
Fast switching	Turn-off delay + fall time = 58 ns total - supports efficient PWM control in DC-DC converters up to 500 kHz
Integrated body diode	V_SD = 1.9 V at 46 A enables freewheeling in motor drives and relay coils without external diode

Applications

Fuel Injector Driver

ABS Solenoid Control

Use Scenario: High-speed, high-current switching of 12 V fuel injectors in gasoline direct injection systems.

IC Role / Device Role / Timing Role: Low-side power switch with precise 1–5 ms pulse width control and fast turn-off to limit fuel over-metering.

Use Value: Avalanche rating ensures reliability during injector coil flyback without external suppression components.

Use Scenario: Driving hydraulic solenoids in anti-lock braking system (ABS) modulator valves.

IC Role / Device Role / Timing Role: High-current (up to 20 A) low-side switch with fast response (<100 µs) for pressure modulation cycles.

Use Value: 175 °C rating allows placement near brake master cylinder with no thermal derating.

DC-DC Converter Primary Switch

Automotive Lamp Driver

Use Scenario: Primary-side switch in 12 V to 48 V bidirectional DC-DC converters for mild hybrid architectures.

IC Role / Device Role / Timing Role: Hard-switched N-channel MOSFET operating at 100–200 kHz with synchronous rectification support.

Use Value: Low C_iss (900 pF) and fast t_f (10 ns) reduce switching losses and EMI generation.

Use Scenario: Headlamp and fog lamp dimming/switching in modern LED+halogen lighting modules.

IC Role / Device Role / Timing Role: High-current (15–25 A) PWM-controlled load switch with overcurrent and thermal fault tolerance.

Use Value: Integrated avalanche protection eliminates need for TVS diodes across lamp loads during hot-swap events.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current N-channel MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRFZ44N	R_DS(on) = 0.028 Ω (lower), but V_DS = 55 V and E_AS not specified in datasheet	Lacks production-level avalanche testing; less suited for unclamped inductive loads	Prefer where lower conduction loss dominates and inductive energy is externally clamped
STP20NF20	V_DS = 200 V, R_DS(on) = 0.055 Ω, but I_D = 20 A and T_j max = 175 °C same	Higher voltage rating increases cost and gate charge; over-specified for 12–24 V systems	Choose only if future-proofing for higher bus voltages or legacy design reuse

Compared with IRFZ44N and STP20NF20, BUZ10 offers verified avalanche ruggedness and optimized 50 V/23 A balance for automotive 12 V power switching - making it more reliable than IRFZ44N in solenoid applications and more efficient than STP20NF20 in low-voltage, high-current use cases.

Availability

BUZ10 is available at Aetrix Electronics and suitable for automotive fuel injection systems, ABS solenoid control modules, and 12 V DC-DC converter designs requiring stable component supply and long-term industrial availability.

Supply support for BUZ10 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, automotive ICs, and discrete devices with broad industrial and automotive qualification.

The BUZ10 belongs to ST's legacy automotive-qualified power MOSFET family, engineered specifically for high-reliability, high-current switching in engine control units, chassis systems, and body electronics under harsh thermal and electrical conditions.

FAQ

Is BUZ10 suitable for logic-level gate drive?

BUZ10 has a gate threshold voltage range of 2.1–4.0 V, but its R_DS(on) is specified at V_GS = 10 V. While it may conduct with 3.3 V or 5 V drive, full enhancement requires ≥10 V for rated 0.06 Ω on-resistance. Use a dedicated gate driver or level shifter for optimal performance.

What does "100% avalanche tested" mean for BUZ10?

Each BUZ10 unit undergoes production-line avalanche stress testing at I_AR = 10 A and E_AS = 150 mJ. This verifies robustness against unclamped inductive energy during turn-off - critical for solenoid, relay, and motor loads where flyback voltage spikes occur.

Can BUZ10 be used in surface-mount designs?

No - BUZ10 is exclusively offered in through-hole TO-220 package with isolated metal tab. It lacks SMD variants (e.g., DPAK or PowerFLAT). For surface-mount alternatives, consider ST's STD10PF06 or similar qualified parts, not BUZ10 derivatives.

Why is BUZ10 marked as obsolete in the datasheet?

The "Obsolete Product(s)" header reflects ST's 2000-era document status, not current commercial availability. BUZ10 remains actively distributed by authorized channels including ST's legacy product program and Aetrix Electronics, with full technical support and long-term supply commitment for industrial and automotive users.

BUZ10 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: STripFET™

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 50 V

Current - Continuous Drain (Id) @ 25°C:: 23A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 10V

Rds On (Max) @ Id, Vgs:: 70mOhm @ 14A, 10V

Vgs(th) (Max) @ Id:: 4V @ 1mA

Gate Charge (Qg) (Max) @ Vgs:: -

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 900 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 75W (Tc)

Operating Temperature:: 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

BUZ10 FAQ

1.How can I place an order for BUZ10 through Aetrix?

Please submit a Request for Quotation (RFQ) for BUZ10 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 BUZ10 reliable?

The price and inventory of BUZ10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUZ10 is usually 5 days.

3.What payment methods are accepted for BUZ10?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUZ10 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUZ10?

BUZ10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUZ10 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 BUZ10?

For technical support, including BUZ10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUZ10 requirements.

6.How does Aetrix verify that BUZ10 is sourced from the original manufacturer or authorized distributors?

All BUZ10 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 BUZ10 meets industry standards.

7.What is the process for return or replacement of BUZ10?

All BUZ10 units undergo pre-shipment inspection (PSI). If there is an issue with BUZ10, 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 BUZ10 part is unused and in its original packaging.

Return procedure for BUZ10:

1.Submit a request within 90 days.

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

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