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

Infineon Technologies BUZ80A

Name: BUZ80A
Brand: Infineon Technologies
SKU: BUZ80A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUZ80A

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: BUZ80A.pdf

Description:: MOSFET N-CH 800V 3.6A TO220AB

Quantity:: RFQ Add To RFQ list

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Inventory:2,169

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Product details

Overview

BUZ80A from Infineon Technologies is an N-channel enhancement-mode SIPMOS® power MOSFET rated for 800 V drain-source voltage, 3.6 A continuous drain current, and 3 Ω maximum R_DS(on) at V_GS = 10 V; it features avalanche energy rating (E_AS = 320 mJ), integrated body diode, and TO-220 AB package - used in flyback and offline SMPS primary-side switching.

For engineers reviewing the BUZ80A datasheet, BUZ80A pinout, BUZ80A application, or BUZ80A equivalent, key selection criteria include avalanche ruggedness, high-voltage blocking capability, thermal resistance (R_thJC ≤ 1.25 K/W), and gate threshold voltage (V_GS(th) = 2.1–4 V) for reliable turn-on in isolated gate-drive topologies.

Technical Context

This device operates as a unidirectional high-voltage switch with inherent avalanche-rated robustness, enabling operation without external snubbers in inductive load switching. Its transconductance (g_fs = 1–3.6 S) and low input capacitance (C_iss = 900–1350 pF) support fast switching up to 100 kHz in discontinuous conduction mode (DCM) converters.

The integrated body diode exhibits V_SD = 1.0–1.3 V at I_F = 6.2 A and t_rr = 370 ns, making it suitable for freewheeling in single-ended topologies where synchronous rectification is not implemented. Safe operating area (SOA) is defined for DC, 10 ms, 1 ms, and 100 µs pulses at T_C = 25 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	800 V - supports direct rectified AC line switching up to 565 V_DC with margin for surge.
I_D (continuous)	3.6 A at T_C = 25 °C - defines max steady-state current before thermal derating begins.
R_DS(on)	2.5–3 Ω at V_GS = 10 V - determines conduction loss (P_cond ≈ I² × R) in primary-side switch.
E_AS	320 mJ - quantifies single-pulse avalanche energy handling without failure under inductive turn-off stress.
t_r/t_f	65–85 ns - enables efficient hard-switched operation below 100 kHz with controlled EMI generation.
V_GS(th)	2.1–4 V - ensures gate drive compatibility with standard 12 V or 15 V isolated supplies.
C_iss	900–1350 pF - impacts gate drive power requirement and switching speed in voltage-mode controllers.

Pinout & Package

BUZ80A uses the TO-220 AB package: insulated tab, vertical mounting, 3-pin through-hole configuration with metal tab electrically connected to Drain. Pin 1 = Gate, Pin 2 = Drain, Pin 3 = Source.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Gate	High-impedance control terminal requiring <100 nA leakage; drives channel via capacitive coupling (C_iss).
Pin 2	Drain	High-voltage output node; electrically tied to metal tab - requires isolation from heatsink unless floating design.
Pin 3	Source	Reference node for gate drive; carries full load current and forms return path for body diode conduction.

Key Features

Feature	Design Value
Avalanche-rated operation	Guaranteed single-pulse E_AS = 320 mJ enables reliable inductive turn-off without external clamping.
High-voltage blocking	V_(BR)DSS = 800 V provides 20% margin over 650 V rectified mains, supporting universal-input offline SMPS.
Low thermal resistance	R_thJC ≤ 1.25 K/W allows 100 W dissipation with modest heatsinking - critical for compact adapter designs.
Integrated body diode	V_SD = 1.0–1.3 V at 6.2 A supports freewheeling in flyback/forward converters without discrete diode.
Stable threshold voltage	V_GS(th) shifts only −0.2 V from −55 °C to +150 °C - ensures consistent turn-on across industrial temperature range.

Applications

AC-DC Adapter Primary Switch

Flyback Converter Main Switch

Use Scenario: 12 V/3 A universal-input wall adapter using DCM flyback topology with optocoupler feedback.

IC Role / Device Role / Timing Role: High-side main switch controlling energy transfer from primary to secondary during gate-on interval.

Use Value: Avalanche rating eliminates need for RCD clamp; 800 V rating supports 265 V_AC input surges without derating.

Use Scenario: 24 V/2 A industrial power supply with 50 kHz switching frequency and no synchronous rectification.

IC Role / Device Role / Timing Role: Unidirectional power switch turning on/off primary winding current; body diode conducts during off-time.

Use Value: Low C_iss (900–1350 pF) reduces gate drive loss; R_DS(on) ≤ 3 Ω limits conduction loss to <40 W at full load.

Offline LED Driver Switch

Capacitor-Discharge Ignition (CDI)

Use Scenario: Non-isolated buck-derived LED driver for street lighting, operating directly from 230 V_AC rectified bus.

IC Role / Device Role / Timing Role: High-voltage series switch regulating average LED current via duty-cycle control.

Use Value: V_(BR)DSS = 800 V withstands 325 V_DC peak plus line transients; SOA supports repetitive 10 ms pulses.

Use Scenario: Motorcycle CDI module storing energy in capacitor and discharging through ignition coil via triggered switch.

IC Role / Device Role / Timing Role: High-dV/dt, high-current pulse switch releasing stored capacitor energy into primary coil winding.

Use Value: E_AS = 320 mJ handles repetitive inductive kickback; t_r/t_f < 90 ns ensures precise spark timing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP8NK80ZFP	800 V, 7.5 A, R_DS(on) = 1.2 Ω, superjunction Zener-protected, TO-220FP package.	Higher current rating and lower R_DS(on), but non-insulated tab requires heatsink isolation.	Select when higher efficiency at >2 A load is needed and board layout permits isolated heatsink mounting.
IPP80N06S2L-05	60 V, 80 A, R_DS(on) = 5.5 mΩ, logic-level gate, TO-220 package - not voltage-compatible.	Not suitable for >400 V applications; intended for low-voltage motor control or POL conversion.	Reject for BUZ80A replacement; only consider if redesigning system to use <100 V DC bus.

Compared with STP8NK80ZFP, BUZ80A offers lower cost and proven avalanche ruggedness in legacy flyback designs, while IPP80N06S2L-05 is electrically incompatible due to 60 V rating - confirming BUZ80A's niche in 600–800 V primary-side switching where reliability under transient stress is prioritized over conduction loss.

Availability

BUZ80A is available at Aetrix Electronics and suitable for AC-DC adapters, flyback converters, offline LED drivers, and capacitor-discharge ignition systems requiring stable component supply across extended production lifecycles.

Supply support for BUZ80A 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive ICs, and industrial control solutions, with global manufacturing and quality certification to ISO/TS 16949 and ISO 14001.

BUZ80A belongs to Infineon's SIPMOS® family of high-voltage power MOSFETs, designed specifically for rugged, cost-sensitive offline power conversion in consumer and industrial equipment where avalanche tolerance and thermal stability are essential.

FAQ

Is BUZ80A suitable for use in zero-voltage switching (ZVS) topologies?

No - BUZ80A is optimized for hard-switched applications like DCM flyback and basic forward converters. Its relatively high C_oss (95–140 pF) and lack of specified ZVS-specific parameters (e.g., Q_g vs. V_DS curves) make it less ideal for resonant or soft-switching designs where low output capacitance and precise gate charge control are required.

What is the maximum gate resistor value recommended for BUZ80A in 50 kHz flyback operation?

A gate resistor of 22–47 Ω is recommended when driven by a 12 V source with 1 A peak capability. This balances switching speed (t_r/t_f ~75 ns) against gate oscillation risk and EMI; values above 100 Ω increase turn-on delay beyond safe SOA limits at full load.

Does BUZ80A require a negative gate voltage for reliable turn-off?

No - BUZ80A has low gate leakage (I_GSS ≤ 100 nA at V_GS = 20 V) and stable V_GS(th); a 0 V gate return is sufficient for turn-off. Negative bias is unnecessary and adds complexity without benefit in standard isolated gate-driver configurations.

Can BUZ80A be paralleled for higher current capacity?

Not recommended - BUZ80A lacks built-in current-sharing features (e.g., positive temperature coefficient of R_DS(on) over full range). Thermal runaway risk exists due to R_DS(on) decreasing with temperature; parallel operation requires individual gate resistors, matched layout, and active current balancing circuitry.

BUZ80A Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: SIPMOS®

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Discontinued at Digi-Key

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 800 V

Current - Continuous Drain (Id) @ 25°C:: 3.6A (Tc)

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

Rds On (Max) @ Id, Vgs:: 3Ohm @ 2A, 10V

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

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

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 1350 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 100W (Tc)

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220AB

BUZ80A FAQ

1.How can I place an order for BUZ80A through Aetrix?

Please submit a Request for Quotation (RFQ) for BUZ80A 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 BUZ80A reliable?

The price and inventory of BUZ80A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUZ80A is usually 5 days.

3.What payment methods are accepted for BUZ80A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUZ80A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUZ80A?

BUZ80A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUZ80A 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 BUZ80A?

For technical support, including BUZ80A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUZ80A requirements.

6.How does Aetrix verify that BUZ80A is sourced from the original manufacturer or authorized distributors?

All BUZ80A 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 BUZ80A meets industry standards.

7.What is the process for return or replacement of BUZ80A?

All BUZ80A units undergo pre-shipment inspection (PSI). If there is an issue with BUZ80A, 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 BUZ80A part is unused and in its original packaging.

Return procedure for BUZ80A:

1.Submit a request within 90 days.

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

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