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

STMicroelectronics STF7N90K5

Name: STF7N90K5
Brand: STMicroelectronics
SKU: STF7N90K5
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STF7N90K5

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-220-3 Full Pack

Datasheet:: STF7N90K5.pdf

Description:: MOSFET N-CH 900V 7A TO220FP

Quantity:: RFQ Add To RFQ list

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Inventory:930

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Product details

Overview

STF7N90K5 from STMicroelectronics is a 900 V, 7 A N-channel power MOSFET in TO-220FP package, featuring 810 mΩ max R_DS(on), 12 nC total gate charge, and 2.5 kV insulation withstand voltage. It uses MDmesh K5 vertical structure for ultra-low FoM and is Zener-protected with 100% avalanche testing-deployed in high-voltage AC-DC adapters and industrial SMPS.

For engineers reviewing the STF7N90K5 datasheet, STF7N90K5 pinout, STF7N90K5 application, or STF7N90K5 equivalent, key selection criteria include its 900 V breakdown rating, 5 °C/W junction-to-case thermal resistance, 230 mJ single-pulse avalanche energy, and rugged dv/dt performance up to 50 V/ns in MOSFET mode.

Technical Context

This device implements ST's MDmesh K5 proprietary vertical superjunction architecture, enabling 720 mΩ typ. R_DS(on) at 900 V while maintaining low C_iss (425 pF) and ultra-low Q_g (12 nC). Its Zener-protected gate and 100% unclamped inductive switching (UIS) qualification support reliable operation in hard-switched PFC and flyback converters.

The TO-220FP package integrates insulated mounting via 2.5 kV RMS isolation between leads and heat sink, supporting direct heatsink mounting without insulating pads. Thermal design is enabled by validated R_thJC = 5 °C/W and safe operating area (SOA) rated up to 10 ms at 150 °C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	900 V - Withstands full mains surge in 400 VAC+ systems without derating
R_DS(on) max	810 mΩ - Enables <7 W conduction loss at 7 A continuous drain current
Q_g	12 nC - Reduces gate drive power and enables >300 kHz switching in resonant topologies
E_AS	230 mJ - Supports robust unclamped inductive switching in PFC and LLC circuits
V_ISO	2.5 kV RMS - Eliminates need for insulating hardware when mounted to metal chassis
dv/dt ruggedness	50 V/ns - Prevents false turn-on during fast voltage transients in high-noise environments
T_J range	–55 to 150 °C - Qualified for industrial and outdoor power supply deployments

Pinout & Package

TO-220FP (Type B) package with insulated tab: 10.4 mm height, 30.6 mm length, 4.6 mm width, and 3.2 mm mounting hole diameter. Tab is electrically isolated from all three leads.

Pin/Terminal	Circuit Role	Design Meaning
1 (G)	Gate	Control terminal requiring ≤±30 V bias; 6.7 Ω intrinsic gate resistance limits ringing
2 (D)	Drain	High-side switch node; connected to insulated tab for direct heatsink mounting
3 (S)	Source	Power return path; referenced to PCB ground; supports 7 A continuous current

Key Features

Feature	Design Value
Ultra-low gate charge	12 nC total charge enables efficient 300–500 kHz operation with minimal driver loss
Zener-protected gate	Integrated gate-source Zener clamps transient overvoltage to ±30 V, eliminating external TVS
100% avalanche tested	Each unit passes UIS stress test at 2.4 A/50 V, ensuring field reliability in inductive loads
MDmesh K5 technology	Vertical superjunction structure achieves 720 mΩ typ. R_DS(on) at 900 V, reducing FoM by 40% vs prior gen
Insulated TO-220FP	2.5 kV RMS isolation allows direct metal heatsink mounting without mica pads or sil-pads

Applications

Industrial SMPS

Server PSU Front-End

Use Scenario: 3 kW telecom rectifier with active clamp forward topology operating at 100 kHz.

IC Role / Device Role / Timing Role: High-side main switch handling 900 V DC bus and 7 A peak current.

Use Value: 230 mJ E_AS and 50 V/ns dv/dt ruggedness prevent failure during line surges and transformer reset spikes.

Use Scenario: 80 PLUS Titanium server power supply using interleaved PFC stage.

IC Role / Device Role / Timing Role: Boost switch in continuous conduction mode (CCM) PFC with 720 V blocking requirement.

Use Value: 12 nC Q_g and 425 pF C_iss reduce switching losses and EMI generation at 70 kHz switching frequency.

AC-DC Adapters

EV Charger Auxiliary Supply

Use Scenario: 150 W universal-input offline flyback adapter for medical equipment.

IC Role / Device Role / Timing Role: Primary-side switching element with 900 V V_DS margin for 264 VAC + 100% surge.

Use Value: –55 to 150 °C T_J range and 2.5 kV V_ISO ensure compliance with IEC 60601-1 creepage/clearance requirements.

Use Scenario: 300 V auxiliary DC-DC converter powering control logic in 11 kW on-board EV charger.

IC Role / Device Role / Timing Role: Isolated flyback primary switch operating from 400 V DC link with high thermal cycling.

Use Value: 5 °C/W R_thJC and 100% avalanche testing enable stable 4.4 A continuous current at 100 °C case temperature.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STF8N90K5	8 A ID rating, 720 mΩ R_DS(on) typ., same 900 V V_DS and TO-220FP package	Higher current capability suits 20% higher load designs; identical thermal footprint	Select when system requires ≥7.5 A continuous drain current with unchanged board layout
IPP65R095CFD7	650 V V_DS, 95 mΩ R_DS(on), TO-220FP, CoolMOS CFD7 technology	Limited to 650 V systems; superior efficiency below 400 VDC but unsafe above 650 V	Choose only for 380–400 VDC bus applications where lower R_DS(on) outweighs voltage limitation

Compared with STF8N90K5, STF7N90K5 trades 1 A current headroom for identical voltage rating and thermal behavior; versus IPP65R095CFD7, it provides essential 900 V safety margin for universal-input and 400 VAC+ industrial systems where 650 V devices risk catastrophic failure.

Availability

STF7N90K5 is available at Aetrix Electronics and suitable for industrial SMPS, server power supplies, AC-DC adapters, and EV auxiliary converters requiring stable component supply under extended temperature and high-reliability conditions.

Supply support for STF7N90K5 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, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

STF7N90K5 belongs to the MDmesh K5 high-voltage power MOSFET product line, engineered specifically for high-efficiency, high-power-density AC-DC conversion in industrial and server-grade power supplies.

FAQ

What is the maximum continuous drain current at 100 °C case temperature?

The STF7N90K5 supports 4.4 A continuous drain current at T_C = 100 °C, as specified in Table 1 of DS11868 Rev 3. This derating reflects thermal limitations of the TO-220FP package and ensures safe operation within SOA boundaries at elevated ambient temperatures.

Does this MOSFET include integrated gate protection?

Yes - STF7N90K5 features an integrated Zener diode between gate and source, clamping gate-source voltage to ±30 V. This eliminates the need for external gate protection components in most standard switching applications per datasheet Section 1.

Can STF7N90K5 be used in avalanche-mode operation?

Yes - every unit undergoes 100% unclamped inductive switching (UIS) testing at I_AR = 2.4 A and V_DD = 50 V, delivering 230 mJ single-pulse avalanche energy. This qualifies it for controlled avalanche use in snubberless designs and fault-tolerant topologies.

What is the thermal resistance from junction to case?

The junction-to-case thermal resistance (R_thJC) is 5 °C/W, measured under standard test conditions per Table 2 of DS11868 Rev 3. This value is critical for heatsink sizing and confirms the TO-220FP package's ability to dissipate up to 25 W at T_C = 25 °C.

STF7N90K5 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: MDmesh™ K5

Package/Case:: TO-220-3 Full Pack

Packaging:: Tube

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 900 V

Current - Continuous Drain (Id) @ 25°C:: 7A (Tc)

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

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

Vgs(th) (Max) @ Id:: 5V @ 100µA

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

Vgs (Max):: ±30V

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

FET Feature:: -

Power Dissipation (Max):: 25W

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220FP

STF7N90K5 FAQ

1.How can I place an order for STF7N90K5 through Aetrix?

Please submit a Request for Quotation (RFQ) for STF7N90K5 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 STF7N90K5 reliable?

The price and inventory of STF7N90K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STF7N90K5 is usually 5 days.

3.What payment methods are accepted for STF7N90K5?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STF7N90K5 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STF7N90K5?

STF7N90K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STF7N90K5 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 STF7N90K5?

For technical support, including STF7N90K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STF7N90K5 requirements.

6.How does Aetrix verify that STF7N90K5 is sourced from the original manufacturer or authorized distributors?

All STF7N90K5 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 STF7N90K5 meets industry standards.

7.What is the process for return or replacement of STF7N90K5?

All STF7N90K5 units undergo pre-shipment inspection (PSI). If there is an issue with STF7N90K5, 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 STF7N90K5 part is unused and in its original packaging.

Return procedure for STF7N90K5:

1.Submit a request within 90 days.

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

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