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

STMicroelectronics STFI6N80K5

Name: STFI6N80K5
Brand: STMicroelectronics
SKU: STFI6N80K5
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STFI6N80K5

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-262-3 Full Pack, I2PAK

Datasheet:: STFI6N80K5.pdf

Description:: MOSFET N-CH 800V 4.5A I2PAKFP

Quantity:: RFQ Add To RFQ list

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Inventory:1,477

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Product details

Overview

STFI6N80K5 from STMicroelectronics is an N-channel 800 V, 1.3 Ω typ. (1.6 Ω max.), 4.5 A MDmesh K5 Power MOSFET in TO-220FP package, featuring ultra-low gate charge (13 nC), 100% avalanche tested, and Zener-protected gate. It delivers high power density for offline SMPS, PFC stages, and industrial AC-DC converters operating at 50–100 kHz.

For engineers reviewing the STFI6N80K5 datasheet, STFI6N80K5 pinout, STFI6N80K5 application, or STFI6N80K5 equivalent, key selection criteria include R_DS(on) stability over temperature, dv/dt ruggedness (50 V/ns), single-pulse avalanche energy (85 mJ), and insulated package rating (2.5 kV RMS).

Technical Context

This device implements ST's MDmesh K5 vertical superjunction architecture to minimize conduction and switching losses simultaneously. Its 270 pF input capacitance and 9.6 nC gate-drain charge enable fast, controlled turn-off with low EMI in hard-switched topologies.

The integrated source-drain diode exhibits 280 ns reverse recovery time at 25 °C and 450 ns at 150 °C, with 3.15 µC Q_rr, supporting quasi-resonant and LLC designs where diode softness impacts efficiency and snubber stress.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	800 V - Withstands full mains rectified voltage in universal-input 85–265 VAC systems without derating.
R_DS(on) max	1.6 Ω - Ensures ≤7.2 W conduction loss at 4.5 A DC, enabling compact heatsink design in 100–300 W PFC stages.
Q_g	13 nC - Reduces gate drive power and enables use of low-cost 100 mA gate drivers in high-frequency SMPS.
E_AS	85 mJ - Supports unclamped inductive switching in flyback and forward converters without external clamping.
dv/dt ruggedness	50 V/ns - Sustains rapid voltage transients during hard commutation, reducing false triggering risk in noisy industrial environments.
V_ISO	2.5 kV RMS - Allows direct mounting on grounded heat sinks without insulating pads in Class I AC-DC supplies.

Pinout & Package

TO-220FP (Type B) package: insulated plastic case with integral heatsink tab; creepage/clearance optimized for 300 V RMS working voltage; lead-free, RoHS-compliant ECOPACK2 grade.

Pin/Terminal	Circuit Role	Design Meaning
1 (G)	Gate	High-impedance control terminal; requires <±30 V rating and 7.5 Ω intrinsic resistance limiting slew rate.
2 (D)	Drain	Main high-voltage power terminal; electrically connected to heatsink tab; carries full load current and switching transients.
3 (S)	Source	Power return path and reference for gate drive; forms common node with driver ground in low-side configurations.

Key Features

Feature	Design Value
Ultra-low gate charge	13 nC total charge enables <100 ns turn-off with 10 Ω gate resistor, minimizing switching loss in 100 kHz+ converters.
Zener-protected gate	Integrated 30 V gate oxide protection eliminates need for external gate Zener clamp in cost-sensitive designs.
100% avalanche tested	Every unit validated for 1.5 A repetitive avalanche current, ensuring robustness against transient overvoltage events.
Low FoM (R_DS(on) × Q_g)	20.8 Ω·nC - Benchmark figure of merit for high-voltage MOSFETs, directly correlating to system-level efficiency gain vs. legacy K3/K4 devices.

Applications

Industrial AC-DC Power Supplies

Server & Telecom Rectifiers

Use Scenario: 300 W active PFC front-end in 19-inch rack-mounted telecom rectifier.

IC Role / Device Role / Timing Role: High-side switch in continuous conduction mode (CCM) boost converter operating at 65 kHz.

Use Value: 1.3 Ω R_DS(on) and 13 nC Q_g reduce total losses by 1.8 W versus STW20NK50Z, improving thermal margin at 60 °C ambient.

Use Scenario: Primary-side switch in 500 W LLC resonant DC-DC converter for server VRMs.

IC Role / Device Role / Timing Role: Hard-switched upper switch in half-bridge configuration with 200 V/ns dV/dt stress.

Use Value: 50 V/ns dv/dt ruggedness prevents spurious turn-on; 2.5 kV insulation allows direct heatsink mounting, simplifying mechanical layout.

LED Streetlight Drivers

Industrial Motor Drives

Use Scenario: Isolated flyback LED driver for 150 W outdoor luminaire with surge immunity to 6 kV line-to-line.

IC Role / Device Role / Timing Role: Primary switch subjected to repeated unclamped inductive spikes during output short-circuit events.

Use Value: 85 mJ E_AS absorbs worst-case energy without failure, eliminating need for TVS clamping and reducing BOM count.

Use Scenario: Brake chopper switch in 3 kW variable frequency drive for HVAC compressors.

IC Role / Device Role / Timing Role: Energy-dumping switch activated during regenerative braking, handling 18 A pulsed current.

Use Value: 18 A I_DM rating and 2.8 A continuous current at 100 °C allow reliable operation without forced air cooling in enclosed cabinets.

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
STF6N80K5	Same die, identical specs; STFI6N80K5 is obsolete marking variant per Rev 5 datasheet.	Identical TO-220FP package and pinout; same insulation rating and thermal resistance.	Select STF6N80K5 for new designs; STFI6N80K5 is no longer orderable per official revision history.
IPP60R190C7	650 V rating, 0.19 Ω R_DS(on), higher Q_g (24 nC); CoolMOS C7 technology.	Limited to 265 VAC mains; unsuitable for 380 VDC bus or 400 VAC industrial inputs.	Choose only for lower-voltage, higher-current applications where 650 V suffices and lower R_DS(on) outweighs gate drive overhead.

Compared with STF6N80K5 and IPP60R190C7, STFI6N80K5 offers superior voltage headroom and lower gate charge for 800 V systems, while IPP60R190C7 trades voltage capability for reduced conduction loss below 600 V-making STF6N80K5 the sole viable option for universal-input offline converters requiring 800 V blocking.

Availability

STFI6N80K5 is available at Aetrix Electronics and suitable for industrial AC-DC power supplies, LED streetlight drivers, and motor drive brake choppers requiring stable component supply and long-term lifecycle support.

Supply support for STFI6N80K5 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 automotive, industrial, and consumer markets.

STFI6N80K5 belongs to the MDmesh K5 high-voltage Power MOSFET product line, engineered specifically for high-efficiency, high-power-density offline SMPS and PFC circuits demanding ruggedness, low loss, and long-term reliability.

FAQ

Is STFI6N80K5 still in production?

No-per DS9678 Rev 5 (March 2026), STFI6N80K5 was removed from the orderable part list. STF6N80K5 is the active, functionally identical replacement with identical marking "6N80K5" and TO-220FP packaging. No electrical or mechanical differences exist between the two.

Can STFI6N80K5 be used in place of STF6N80K5?

Yes-STFI6N80K5 and STF6N80K5 share identical die, absolute maximum ratings, electrical characteristics, thermal data, and package dimensions. The "I" in STFI6N80K5 was a legacy marking variant discontinued in Rev 5; both parts meet the same MDmesh K5 specification.

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

The maximum continuous drain current is 2.8 A at T_C = 100 °C, as specified in Table 1 of DS9678. This reflects thermal derating due to junction-to-case thermal resistance (5 °C/W) and 150 °C maximum junction temperature limit.

Does STFI6N80K5 require a gate resistor for EMI control?

Yes-a gate resistor of 10–22 Ω is recommended to dampen ringing caused by 7.5 Ω intrinsic gate resistance interacting with PCB trace inductance and 270 pF input capacitance, especially in layouts exceeding 10 cm gate loop length.

STFI6N80K5 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: SuperMESH5™

Package/Case:: TO-262-3 Full Pack, I2PAK

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 800 V

Current - Continuous Drain (Id) @ 25°C:: 4.5A (Tc)

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

Rds On (Max) @ Id, Vgs:: 1.6Ohm @ 2A, 10V

Vgs(th) (Max) @ Id:: 5V @ 100µA

Gate Charge (Qg) (Max) @ Vgs:: 13 nC @ 10 V

Vgs (Max):: 30V

Input Capacitance (Ciss) (Max) @ Vds:: 270 pF @ 100 V

FET Feature:: -

Power Dissipation (Max):: 25W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-281 (I2PAKFP)

STFI6N80K5 FAQ

1.How can I place an order for STFI6N80K5 through Aetrix?

Please submit a Request for Quotation (RFQ) for STFI6N80K5 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 STFI6N80K5 reliable?

The price and inventory of STFI6N80K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STFI6N80K5 is usually 5 days.

3.What payment methods are accepted for STFI6N80K5?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STFI6N80K5 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STFI6N80K5?

STFI6N80K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STFI6N80K5 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 STFI6N80K5?

For technical support, including STFI6N80K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STFI6N80K5 requirements.

6.How does Aetrix verify that STFI6N80K5 is sourced from the original manufacturer or authorized distributors?

All STFI6N80K5 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 STFI6N80K5 meets industry standards.

7.What is the process for return or replacement of STFI6N80K5?

All STFI6N80K5 units undergo pre-shipment inspection (PSI). If there is an issue with STFI6N80K5, 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 STFI6N80K5 part is unused and in its original packaging.

Return procedure for STFI6N80K5:

1.Submit a request within 90 days.

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

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