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

Renesas 2SK3457-AZ

Name: 2SK3457-AZ
Brand: Renesas
SKU: 2SK3457-AZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SK3457-AZ

Manufacturer:: Renesas

Category:: FETs, MOSFETs

Package:: -

Datasheet:: 2SK3457-AZ.pdf

Description:: N-CHANNEL POWER MOSFET

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SK3457-AZ from Renesas Electronics is an N-channel power MOSFET in an isolated TO-220 package, designed for high-voltage switching applications such as offline AC-DC power supplies and DC-DC converters. It features 800 V drain-source breakdown voltage, 2.2 Ω max R_DS(on) at V_GS = 10 V and I_D = 3.0 A, 24 nC typical total gate charge, and built-in avalanche capability (E_AS = 73.8 mJ).

For engineers reviewing the 2SK3457-AZ datasheet, 2SK3457-AZ pinout, 2SK3457-AZ application, or 2SK3457-AZ equivalent, key selection criteria include high-voltage blocking (800 V), low conduction loss under 5 A DC load, fast switching performance (t_d(off) = 43 ns), and ruggedness in inductive switching circuits requiring single-pulse avalanche energy handling.

Technical Context

The 2SK3457-AZ is a DMOS silicon power transistor optimized for hard-switched, high-voltage flyback and forward converter topologies. Its isolated TO-220 package enables direct heatsinking while maintaining electrical isolation between drain and mounting surface - critical for primary-side switch implementations where drain connects to high-voltage bus.

It operates with gate drive compatible with standard ±30 V-rated controllers and delivers stable R_DS(on) up to 150 °C channel temperature. The device's 1220 pF input capacitance and 16 pF reverse transfer capacitance support predictable turn-on/turn-off timing when driven through 10–25 Ω gate resistors, per test circuit conditions in the official datasheet.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	800 V - supports 400 VAC mains-derived 560 VDC bus with 40% safety margin
R_DS(on) max	2.2 Ω at V_GS = 10 V, I_D = 3.0 A - limits conduction loss to ≤20 W at 5 A peak in continuous mode
Q_G typ	24 nC - enables efficient 100 kHz switching with <1 W gate drive loss using 15 V supply
E_AS	73.8 mJ - withstands single-pulse inductive energy without failure at V_DD = 150 V, I_AS = 5.0 A
C_iss	1220 pF - determines Miller plateau duration and gate driver current demand during transitions
t_d(off)	43 ns - defines minimum off-time for >2 MHz PWM operation in resonant designs
T_ch max	150 °C - allows full-rated power dissipation with appropriate thermal design on heatsink

Pinout & Package

2SK3457-AZ uses the isolated TO-220 (MP-45F) package with internal insulation between the drain tab and mounting surface. This eliminates need for insulating washers in heatsinked applications and simplifies layout in high-side or floating switch configurations.

Pin/Terminal	Circuit Role	Design Meaning
1 (Left)	Gate (G)	Controls channel conduction; requires ≤±30 V drive; sensitive to ESD
2 (Center)	Drain (D)	High-voltage terminal; electrically isolated from case; connects to DC bus or transformer primary
3 (Right)	Source (S)	Reference node for gate drive; carries full load current; body diode anode

Key Features

Feature	Design Value
Isolated TO-220 package	Enables direct heatsinking without thermal pad isolation hardware, reducing BOM cost and assembly steps
Avalanche-rated operation	Guarantees robustness against inductive kickback in non-clamped topologies like flyback snubberless designs
Low Q_G/R_DS(on) ratio	Improves trade-off between switching loss and conduction loss - critical for 65–130 kHz SMPS efficiency optimization
Body diode with t_rr = 1310 ns	Supports synchronous rectification in low-frequency forward converters where slow recovery is acceptable

Applications

Industrial AC-DC Power Supply	LED Driver for High-Bay Lighting
Use Scenario: 300 W offline flyback converter powering industrial control systems with universal AC input (90–264 VAC). IC Role / Device Role / Timing Role: Primary-side high-voltage switch handling 560 VDC bus and delivering regulated 24 V output via optocoupler feedback. Use Value: 800 V V_DSS ensures margin over worst-case surge; 2.2 Ω R_DS(on) keeps junction temperature below 125 °C at full load with passive cooling.	Use Scenario: Constant-current LED driver for 150 W high-bay fixtures operating from 277 VAC line in commercial warehouses. IC Role / Device Role / Timing Role: Main switching element in quasi-resonant buck-boost topology driving 350 mA strings at 400 V output. Use Value: Avalanche rating absorbs leakage inductance energy during zero-voltage switching transitions, improving reliability over 50,000-hour lifetime.
Uninterruptible Power Supply (UPS) Inverter Stage	DC Motor Drive for HVAC Blower
Use Scenario: Half-bridge inverter stage converting 380 VDC battery bank to 230 VAC output in line-interactive UPS systems. IC Role / Device Role / Timing Role: High-side switch in 16 kHz PWM-driven H-bridge, paired with complementary low-side FET. Use Value: Isolated TO-220 package allows shared heatsink with galvanic separation between high-side drain and control ground - eliminating level-shifting complexity.	Use Scenario: 24 VDC brushed motor controller for variable-speed HVAC air handlers requiring 8 A peak current. IC Role / Device Role / Timing Role: Low-frequency (≤20 kHz) PWM switch controlling motor torque via duty-cycle modulation. Use Value: 5 A DC rating and 150 °C T_ch enable continuous operation at 40 °C ambient without forced airflow; body diode handles back-EMF recirculation.

Industrial AC-DC Power Supply

LED Driver for High-Bay Lighting

Use Scenario: 300 W offline flyback converter powering industrial control systems with universal AC input (90–264 VAC).

IC Role / Device Role / Timing Role: Primary-side high-voltage switch handling 560 VDC bus and delivering regulated 24 V output via optocoupler feedback.

Use Value: 800 V V_DSS ensures margin over worst-case surge; 2.2 Ω R_DS(on) keeps junction temperature below 125 °C at full load with passive cooling.

Use Scenario: Constant-current LED driver for 150 W high-bay fixtures operating from 277 VAC line in commercial warehouses.

IC Role / Device Role / Timing Role: Main switching element in quasi-resonant buck-boost topology driving 350 mA strings at 400 V output.

Use Value: Avalanche rating absorbs leakage inductance energy during zero-voltage switching transitions, improving reliability over 50,000-hour lifetime.

Uninterruptible Power Supply (UPS) Inverter Stage

DC Motor Drive for HVAC Blower

Use Scenario: Half-bridge inverter stage converting 380 VDC battery bank to 230 VAC output in line-interactive UPS systems.

IC Role / Device Role / Timing Role: High-side switch in 16 kHz PWM-driven H-bridge, paired with complementary low-side FET.

Use Value: Isolated TO-220 package allows shared heatsink with galvanic separation between high-side drain and control ground - eliminating level-shifting complexity.

Use Scenario: 24 VDC brushed motor controller for variable-speed HVAC air handlers requiring 8 A peak current.

IC Role / Device Role / Timing Role: Low-frequency (≤20 kHz) PWM switch controlling motor torque via duty-cycle modulation.

Use Value: 5 A DC rating and 150 °C T_ch enable continuous operation at 40 °C ambient without forced airflow; body diode handles back-EMF recirculation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP8NK80ZFP	800 V, 7.3 A, R_DS(on) = 1.2 Ω, TO-220FP (non-isolated)	Requires insulating washer; higher current but lower R_DS(on); no specified E_AS	Prefer when higher current and lower conduction loss are prioritized and isolation can be added externally
FQP8N80C	800 V, 8.0 A, R_DS(on) = 1.05 Ω, TO-220 (non-isolated)	Non-isolated package; higher ID rating; no published avalanche energy spec	Choose when board space allows external isolation and system-level avalanche testing is performed independently

Compared with STP8NK80ZFP and FQP8N80C, the 2SK3457-AZ trades higher R_DS(on) for guaranteed avalanche ruggedness and factory-integrated isolation - making it preferable in cost-sensitive, thermally constrained, or safety-critical primary-side switch positions where layout simplicity and proven energy-handling are design priorities.

Availability

2SK3457-AZ is available at Aetrix Electronics and suitable for industrial AC-DC power supplies, LED drivers for high-bay lighting, and uninterruptible power supply (UPS) inverter stages requiring stable component supply and long-term obsolescence management.

Supply support for 2SK3457-AZ 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

Renesas Electronics Corporation is a Japanese semiconductor manufacturer formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, power, and timing solutions.

The 2SK3457-AZ belongs to Renesas' legacy high-voltage discrete MOSFET product line, engineered specifically for reliable, cost-effective switching in industrial and commercial power conversion systems operating up to 800 V.

FAQ

What is the maximum continuous drain current rating for the 2SK3457-AZ?

The 2SK3457-AZ has a maximum continuous drain current (I_D(DC)) of ±5.0 A at case temperature T_C = 25°C. Derating applies above 25°C - for example, at T_C = 100°C, the usable I_D(DC) drops to approximately 2.5 A based on the 50 W total power dissipation limit and R_DS(on) thermal coefficient. Always verify thermal design using the provided transient thermal resistance curve.

Does the 2SK3457-AZ have a built-in body diode, and what are its characteristics?

Yes, the 2SK3457-AZ integrates a parasitic body diode between source and drain. Its forward voltage (V_F(S-D)) is 1.0 V at I_F = 5.0 A and V_GS = 0 V, with reverse recovery time (t_rr) of 1310 ns and reverse recovery charge (Q_rr) of 6.6 µC under specified test conditions. This diode supports freewheeling in inductive loads but is not optimized for high-frequency synchronous rectification.

Can the 2SK3457-AZ be used in avalanche mode repeatedly, or is it rated for single-pulse only?

The 2SK3457-AZ is explicitly rated for single-pulse avalanche operation - E_AS = 73.8 mJ and I_AS = 5.0 A are defined under single-pulse test conditions (starting T_ch = 25°C, V_DD = 150 V, R_G = 25 Ω). Repetitive avalanche is not characterized or guaranteed. For circuits requiring repeated inductive energy clamping, external protection (e.g., RCD snubber or TVS) is recommended alongside the 2SK3457-AZ.

What is the gate threshold voltage range for the 2SK3457-AZ, and how does it affect drive requirements?

The gate threshold voltage (V_GS(off)) of the 2SK3457-AZ is specified from 2.5 V to 3.5 V at V_DS = 10 V and I_D = 1 mA. This relatively narrow range ensures consistent turn-on behavior across units. To achieve full enhancement and low R_DS(on), a minimum V_GS of 10 V is required - confirming compatibility with standard logic-level or dedicated gate drivers supplying ≥10 V.

Is the 2SK3457-AZ RoHS compliant, and what is its quality grade classification?

The 2SK3457-AZ is RoHS compliant per EU Directive 2011/65/EU, as confirmed by Renesas' environmental compliance documentation. Its quality grade is "Standard", meaning it is qualified for use in computers, office equipment, communications gear, industrial robots, and home appliances - but not for automotive, medical life-support, or aerospace applications unless separately validated and approved by Renesas.

2SK3457-AZ Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

FET Type:: -

Technology:: -

Drain to Source Voltage (Vdss):: -

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

Drive Voltage (Max Rds On, Min Rds On):: -

Rds On (Max) @ Id, Vgs:: -

Vgs(th) (Max) @ Id:: -

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

Vgs (Max):: -

Input Capacitance (Ciss) (Max) @ Vds:: -

FET Feature:: -

Power Dissipation (Max):: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

2SK3457-AZ FAQ

1.How can I place an order for 2SK3457-AZ through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SK3457-AZ 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 2SK3457-AZ reliable?

The price and inventory of 2SK3457-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SK3457-AZ is usually 5 days.

3.What payment methods are accepted for 2SK3457-AZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SK3457-AZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SK3457-AZ?

2SK3457-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SK3457-AZ 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 2SK3457-AZ?

For technical support, including 2SK3457-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SK3457-AZ requirements.

6.How does Aetrix verify that 2SK3457-AZ is sourced from the original manufacturer or authorized distributors?

All 2SK3457-AZ 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 2SK3457-AZ meets industry standards.

7.What is the process for return or replacement of 2SK3457-AZ?

All 2SK3457-AZ units undergo pre-shipment inspection (PSI). If there is an issue with 2SK3457-AZ, 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 2SK3457-AZ part is unused and in its original packaging.

Return procedure for 2SK3457-AZ:

1.Submit a request within 90 days.

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

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