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

STMicroelectronics STF4N90K5

Name: STF4N90K5
Brand: STMicroelectronics
SKU: STF4N90K5
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STF4N90K5

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: STF4N90K5.pdf

Description:: MOSFET N-CH 900V 4A TO220FP

Quantity:: RFQ Add To RFQ list

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Inventory:824

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Product details

Overview

STF4N90K5 from STMicroelectronics is a 900 V, 4 A N-channel Power MOSFET in TO-220FP package, fabricated with MDmesh K5 vertical structure technology. It delivers 1.90 Ω typical R_DS(on), 5.3 nC total gate charge, and 100% avalanche-tested ruggedness for high-voltage switching in industrial SMPS and PFC stages.

For engineers reviewing the STF4N90K5 datasheet, STF4N90K5 pinout, STF4N90K5 application, or STF4N90K5 equivalent, key selection criteria include ultra-low FoM (R_DS(on) × Q_g = 10.1 nΩ·F), Zener-protected gate, 2.5 kV insulation rating, and di/dt ruggedness up to 50 V/ns - critical for flyback, resonant, and hard-switched HV converters.

Technical Context

This device employs ST's MDmesh K5 proprietary vertical superjunction architecture to minimize both conduction loss and switching loss simultaneously. Its low C_iss (173 pF) and ultra-low Q_gd/Q_gs ratio (2.8 nC / 1.45 nC) enable fast, controllable turn-on/turn-off with reduced Miller-induced shoot-through risk.

The integrated body diode exhibits 289 ns t_rr at 25 °C and 494 ns at 150 °C, with 1.56 µC Q_rr, supporting moderate-frequency inductive switching. The 6.25 °C/W R_thJC and 100% unclamped inductive avalanche rating (E_AS = 160 mJ) support robust operation under transient overloads.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	900 V - supports DC bus voltages up to 650 V RMS in AC-DC front-ends with margin
R_DS(on) max	2.10 Ω - limits conduction loss to ≤3.36 W at 4 A continuous drain current
Q_g	5.3 nC - enables efficient gate drive with <100 mW driver power at 100 kHz
E_AS	160 mJ - sustains single-pulse inductive energy without failure at T_J = 25 °C
V_iso	2.5 kV RMS - ensures reinforced insulation between leads and heatsink in isolated topologies
dv/dt ruggedness	50 V/ns - prevents spurious turn-on during high-slew-rate voltage transients
t_r/t_f	11.8 ns / 25.5 ns - supports >500 kHz switching with controlled EMI profile

Pinout & Package

TO-220FP (Type B) package: insulated tab, vertical mounting, 3-pin through-hole outline with integral heatsink interface. Pin 1 = Gate, Pin 2 = Drain, Pin 3 = Source.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (G)	Gate control terminal	Low-impedance input requiring <10 V threshold; Zener-protected to ±30 V
Pin 2 (D)	Drain connection	High-voltage node tied to primary-side DC bus; electrically isolated from tab
Pin 3 (S)	Source reference	Return path for load current; referenced to PCB ground plane or floating node

Key Features

Feature	Design Value
Ultra-low gate charge	Q_g = 5.3 nC enables minimal gate drive loss and fast switching in high-frequency SMPS
Zener-protected gate	Integrated ±30 V gate-source clamp eliminates need for external TVS in most layouts
100% avalanche tested	Each unit validated for single-pulse E_AS = 160 mJ - guarantees ruggedness in unclamped inductive loads
MDmesh K5 technology	Vertical superjunction structure achieves 1.90 Ω R_DS(on) at 900 V - 30% lower than prior K3 generation

Applications

Industrial Switch-Mode Power Supplies

Active PFC Front-Ends

Use Scenario: 300–500 W offline flyback or forward converter operating at 65–130 kHz with universal AC input.

IC Role / Device Role / Timing Role: Primary-side high-voltage switch handling full DC link voltage and peak currents up to 4 A.

Use Value: Low R_DS(on) and Q_g reduce conduction + switching losses by ≥12% vs. legacy 900 V MOSFETs, improving efficiency to >89% at full load.

Use Scenario: Boost-type active PFC stage in 1–2 kW server PSUs or industrial motor drives.

IC Role / Device Role / Timing Role: High-side switch in continuous conduction mode (CCM) boost topology, switching at 65–100 kHz.

Use Value: 50 V/ns dv/dt ruggedness prevents false triggering during line-voltage zero-crossing transients, ensuring stable regulation.

High-Voltage DC-DC Converters

Lighting Ballasts & LED Drivers

Use Scenario: Isolated 400–800 V input DC-DC module for telecom or railway auxiliary power.

IC Role / Device Role / Timing Role: Primary-side switch in phase-shifted full-bridge or LLC resonant converter.

Use Value: 2.5 kV isolation rating allows direct mounting to heatsink without insulating pad, simplifying thermal design and reducing parasitic inductance.

Use Scenario: High-bay LED driver with 300–600 V DC input from rectified AC or PV string.

IC Role / Device Role / Timing Role: Buck or buck-boost switch controlling constant-current LED string output.

Use Value: Avalanche-rated operation tolerates LED open-circuit transients without external snubber, lowering BOM cost and board space.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STF3N90K5	3 A rating, 2.7 Ω R_DS(on) max, same K5 process and package	Lower current capability suits <200 W designs; reduced thermal margin at full load	Select when peak ID ≤ 2.5 A and footprint compatibility is required
IPP60R099C7	650 V rating, 0.099 Ω R_DS(on), TO-220FP, CoolMOS C7	Not rated for 900 V systems; requires derating or topology change for 400 VAC+ inputs	Prefer only in 380–450 V DC bus applications where lower R_DS(on) justifies voltage trade-off

Compared with STF3N90K5 and IPP60R099C7, STF4N90K5 uniquely balances 900 V blocking, 4 A current, and 5.3 nC gate charge - making it optimal for 300–500 W universal-input SMPS where voltage margin, avalanche safety, and thermal headroom are non-negotiable.

Availability

STF4N90K5 is available at Aetrix Electronics and suitable for industrial switch-mode power supplies, active PFC front-ends, and high-voltage DC-DC converters requiring stable component supply and long-term production continuity.

Supply support for STF4N90K5 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 microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The MDmesh K5 Power MOSFET product line targets high-efficiency, high-reliability high-voltage switching applications - specifically engineered to replace older superjunction technologies in 600–900 V SMPS, PFC, and industrial inverters.

FAQ

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

The STF4N90K5 supports 2.5 A continuous drain current at T_C = 100 °C, as specified in Table 1 of DS11906 Rev 3. This derating reflects thermal limitations of the TO-220FP package with R_thJC = 6.25 °C/W; proper heatsinking is required to sustain this current without exceeding T_J = 150 °C.

Does the STF4N90K5 include an integrated body diode, and what are its recovery characteristics?

Yes, it features a monolithic source-drain diode with t_rr = 289 ns and Q_rr = 1.56 µC at T_J = 25 °C (ISD = 3 A, di/dt = 100 A/µs). At 150 °C, t_rr increases to 494 ns and Q_rr to 2.45 µC. These values are measured per Figure 15 test circuit and support moderate-frequency hard-switched operation.

Can STF4N90K5 be used in avalanche mode for clamping protection?

Yes - every unit undergoes 100% single-pulse avalanche testing at I_AR = 1 A and E_AS = 160 mJ (T_J = 25 °C). While not intended for repetitive avalanche, it provides reliable overvoltage protection during inductive switching faults, eliminating need for external clamping circuits in many designs.

Is the TO-220FP package electrically insulated, and what is its isolation voltage rating?

Yes - the TO-220FP (Type B) package has an insulated metal tab rated for 2.5 kV RMS insulation withstand voltage between all three leads and external heatsink (t = 1 s, T_C = 25 °C), per Table 1. This allows direct mounting to grounded heatsinks without thermal pads or insulators in isolated topologies.

STF4N90K5 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: MDmesh™ K5

Package/Case:: TO-220-3

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:: 4A (Tc)

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

Rds On (Max) @ Id, Vgs:: 2.1Ohm @ 1A, 10V

Vgs(th) (Max) @ Id:: 5V @ 100µA

Gate Charge (Qg) (Max) @ Vgs:: 5.3 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 173 pF @ 100 V

FET Feature:: -

Power Dissipation (Max):: 20W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220FP

STF4N90K5 FAQ

1.How can I place an order for STF4N90K5 through Aetrix?

Please submit a Request for Quotation (RFQ) for STF4N90K5 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 STF4N90K5 reliable?

The price and inventory of STF4N90K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STF4N90K5 is usually 5 days.

3.What payment methods are accepted for STF4N90K5?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STF4N90K5 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STF4N90K5?

STF4N90K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STF4N90K5 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 STF4N90K5?

For technical support, including STF4N90K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STF4N90K5 requirements.

6.How does Aetrix verify that STF4N90K5 is sourced from the original manufacturer or authorized distributors?

All STF4N90K5 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 STF4N90K5 meets industry standards.

7.What is the process for return or replacement of STF4N90K5?

All STF4N90K5 units undergo pre-shipment inspection (PSI). If there is an issue with STF4N90K5, 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 STF4N90K5 part is unused and in its original packaging.

Return procedure for STF4N90K5:

1.Submit a request within 90 days.

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

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