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

STMicroelectronics BUF410A

Name: BUF410A
Brand: STMicroelectronics
SKU: BUF410A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUF410A

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-247-3

Datasheet:: BUF410A.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:4,889

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Product details

Overview

BUF410A from STMicroelectronics is a high-voltage fast-switching NPN power transistor designed for primary-side switching in offline SMPS and motor drive inverters. It delivers 1000 V V_CEV, 15 A I_C, 125 W P_tot at T_c = 25 °C, and sub-1 µs storage time (t_s = 0.8 µs @ 25 °C) in TO-247 package - enabling robust operation in 400–600 V DC bus applications.

For engineers reviewing the BUF410A datasheet, BUF410A pinout, BUF410A application, or BUF410A equivalent, key selection criteria include its 1000 V blocking capability without snubber, 45 A/µs dI_C/dt rating at 25 °C, RBSOA compliance up to 100 °C, and low 0.5 A base drive requirement for 5 A collector current.

Technical Context

The BUF410A uses high-voltage multi-epitaxial planar technology with cellular emitter structure and planar edge termination to simultaneously achieve high breakdown voltage and fast switching. Its design targets hard-switched inductive loads where safe operating area (SOA), dynamic voltage overshoot (V_CE(dyn) ≤ 2.1 V @ 3 µs), and thermal resistance (R_thj-case ≤ 1 °C/W) are critical.

It operates with fixed-base drive control (no integrated gate driver), requires external negative base turn-off (V_BB = –5 V), and exhibits defined timing behavior: t_s = 1.8 µs, t_f = 0.1 µs, t_c = 0.18 µs at 100 °C - making it suitable for fixed-frequency PWM topologies below 100 kHz.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEV	1000 V - supports direct connection to 800 V peak AC line without snubber in bridge rectified inputs
I_C	15 A continuous - enables ≥500 W output in single-transistor forward or flyback converters
t_s (25 °C)	0.8 µs - reduces switching loss during turn-off in hard-switched inductive circuits
dI_C/dt	45 A/µs - sustains rapid current rise under 300 V V_CC and 60 Ω load without secondary breakdown
R_thj-case	≤1 °C/W - allows full 125 W dissipation with ≤125 °C junction rise over 25 °C case temperature
V_CE(sat)	0.8 V @ I_C = 5 A, I_B = 0.5 A - limits conduction loss to < 4 W at rated current
V_CEO(sus)	450 V - defines maximum sustainable voltage under zero-base-current fault conditions

Pinout & Package

BUF410A is housed in a TO-247 package with isolated mounting flange, standard pin configuration (Emitter–Base–Collector from left to right when facing the front marking side), and ECOPACK® lead-free second-level interconnect compliant with JEDEC JESD97.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (left)	Emitter	Main current return path; electrically tied to mounting tab; requires insulated heatsink interface
Pin 2 (center)	Base	Low-impedance control input; accepts ±5 V drive; 0.5 A sufficient for 5 A I_C
Pin 3 (right)	Collector	High-voltage output terminal; connected to primary winding or DC bus; isolated from tab

Key Features

Feature	Design Value
Cellular emitter structure	Enables uniform current distribution across die surface, improving RBSOA margin at high T_j
Planar edge termination	Suppresses surface leakage and field crowding, supporting stable 1000 V V_CEV rating
Low base-drive requirement	0.5 A I_B drives 5 A I_C - reduces driver stage power loss and complexity
Wide forward/reverse SOA	Rated for 500 V × 10 A inductive switching at 100 °C - eliminates need for oversized snubbers
ECOPACK® packaging	Lead-free solder compatibility and JEDEC-compliant marking for RoHS-conforming production

Applications

Switch Mode Power Supplies

Motor Control

Use Scenario: Primary-side switch in 300–500 W offline flyback or forward converter with universal AC input.

IC Role / Device Role / Timing Role: High-voltage NPN switching element controlled by discrete base driver; handles 50–100 kHz PWM with hard commutation.

Use Value: 1000 V V_CEV allows direct use after 600 V bridge rectifier; low t_s minimizes turn-off loss at full load.

Use Scenario: Low-side switch in 3-phase IGBT gate driver auxiliary supply or DC bus precharge circuit.

IC Role / Device Role / Timing Role: Fast-turnoff NPN for active clamping or snubber discharge; driven with negative base bias.

Use Value: 45 A/µs dI_C/dt and 0.1 µs t_f enable clean current interruption in <10 µs clamp windows.

Industrial HV DC-DC Converters

Induction Heating Drivers

Use Scenario: Series-pass switch in regulated 400–600 V output DC-DC stage for PLC power rails.

IC Role / Device Role / Timing Role: Linear-mode or quasi-resonant switch operating in forward-biased SOA; thermally managed via TO-247 flange.

Use Value: R_thj-case ≤ 1 °C/W and 150 °C T_J(max) support continuous 10 A operation with forced-air cooling.

Use Scenario: Resonant tank interrupter in 20–50 kHz induction heater half-bridge auxiliary control.

IC Role / Device Role / Timing Role: Synchronized turn-off device for zero-voltage switching assist; triggered on current zero-crossing.

Use Value: Sub-1 µs t_s + t_f ensures precise timing alignment with main IGBT gate signals.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage NPN switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BU508AF	Lower V_CEV (1000 V same), but higher V_CE(sat) (1.2 V @ 5 A) and slower t_s (1.5 µs)	Less suitable for high-frequency SMPS due to increased conduction and switching loss	Prefer BUF410A where dI_C/dt > 40 A/µs or T_j > 100 °C is expected
ST13007	Lower voltage rating (400 V V_CEO), lower I_C (8 A), but faster t_f (0.03 µs)	Limited to 250–300 V DC bus systems; not usable in universal-input offline supplies	Select BUF410A for 400–800 V DC applications requiring sustained 10+ A current

Compared with BU508AF and ST13007, BUF410A uniquely balances 1000 V blocking, 15 A current, and sub-1 µs switching in a single TO-247 device - making it the only option among the three qualified for 500 W+ universal-input SMPS with minimal snubbering.

Availability

BUF410A is available at Aetrix Electronics and suitable for switch mode power supplies, motor control inverters, industrial HV DC-DC converters, and induction heating drivers requiring stable component supply across extended product lifecycles.

Supply support for BUF410A 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

BUF410A belongs to ST's high-voltage bipolar power transistor family, engineered specifically for ruggedized switching in offline power conversion and motor drive systems operating above 400 V DC.

FAQ

Is BUF410A pin-compatible with older TO-218 packaged versions?

No. The BUF410A was revised to TO-247 in March 2008 (Rev 3), replacing the legacy TO-218 package. Pin assignment differs: TO-247 uses E-B-C left-to-right; TO-218 used C-B-E. PCB layout and heatsink mounting must be updated accordingly.

What is the recommended base drive configuration for reliable switching?

ST specifies –5 V negative base bias during turn-off (V_BB = –5 V, R_BB = 1.2 Ω) to minimize storage time. For 5 A I_C, apply +1.5 V V_BE(sat) with 0.5 A I_B; ensure driver can sink ≥4.5 A peak base current for safe turn-off under overloads.

Does BUF410A require a snubber network in 450 V DC bus applications?

Not necessarily. With V_CEO(sus) = 450 V and V_CEW = 500 V (at T_c = 125 °C), BUF410A can operate snubberless in clamped inductive loads up to 450 V. However, a small RC snubber is recommended for unclamped topologies or when dI_C/dt exceeds 60 A/µs.

How does thermal performance compare between BUF410A and BU508AF?

BUF410A has R_thj-case ≤ 1 °C/W; BU508AF is rated at 1.2 °C/W. At 125 W dissipation, BUF410A achieves ~125 °C ΔT versus ~150 °C for BU508AF - extending safe operating time at 150 °C T_J(max) and improving reliability in convection-cooled designs.

BUF410A Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-247-3

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: NPN

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

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

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 2A, 10A

Current - Collector Cutoff (Max):: -

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

Power - Max:: 125 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-247-3

BUF410A FAQ

1.How can I place an order for BUF410A through Aetrix?

Please submit a Request for Quotation (RFQ) for BUF410A 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 BUF410A reliable?

The price and inventory of BUF410A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUF410A is usually 5 days.

3.What payment methods are accepted for BUF410A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUF410A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUF410A?

BUF410A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUF410A 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 BUF410A?

For technical support, including BUF410A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUF410A requirements.

6.How does Aetrix verify that BUF410A is sourced from the original manufacturer or authorized distributors?

All BUF410A 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 BUF410A meets industry standards.

7.What is the process for return or replacement of BUF410A?

All BUF410A units undergo pre-shipment inspection (PSI). If there is an issue with BUF410A, 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 BUF410A part is unused and in its original packaging.

Return procedure for BUF410A:

1.Submit a request within 90 days.

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

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