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

STMicroelectronics STU90N4F3

Name: STU90N4F3
Brand: STMicroelectronics
SKU: STU90N4F3
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STU90N4F3

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-251-3 Short Leads, IPAK, TO-251AA

Datasheet:: STU90N4F3.pdf

Description:: MOSFET N-CH 40V 80A IPAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STU90N4F3 from STMicroelectronics is an N-channel 40 V, 6.2 mΩ (max), 80 A, 110 W IPAK-packaged STripFET™ III Power MOSFET designed for high-current switching in DC-DC converters and motor drives. It features standard gate threshold drive (2–4 V), 100% avalanche tested ruggedness, and low gate charge (54 nC) enabling efficient hard-switching at up to 100 kHz.

For engineers reviewing the STU90N4F3 datasheet, STU90N4F3 pinout, STU90N4F3 application, or STU90N4F3 equivalent, key selection criteria include R_DS(on) at 40 A/10 V, safe operating area under unclamped inductive load, thermal resistance (1.36 °C/W junction-to-case), and source-drain diode recovery performance (t_rr = 45 ns, Q_rr = 60 nC).

Technical Context

This MOSFET employs ST's STripFET™ III process optimized for low on-resistance and fast switching. Its gate structure supports standard 10 V drive with V_GS(th) of 2–4 V, eliminating need for level-shifting in 5 V or 3.3 V logic-controlled systems.

It integrates a robust body diode rated for 80 A continuous and 320 A pulsed source-drain current, with reverse recovery characteristics characterized at di/dt = 100 A/µs and T_j = 150 °C - critical for synchronous rectification and freewheeling in buck and half-bridge topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	40 V - Maximum drain-source blocking voltage; suitable for 24 V and 36 V nominal bus systems with margin.
R_DS(on) max	6.2 mΩ @ V_GS = 10 V, I_D = 40 A - Enables <1 W conduction loss at 40 A, reducing heatsink requirements.
I_D (T_C = 25 °C)	80 A - Continuous drain current rating at case temperature 25 °C; derates to 65 A at 100 °C.
E_AS	400 mJ - Single-pulse avalanche energy at T_j = 25 °C; ensures robustness against inductive switching transients.
Q_g	54 nC - Total gate charge; determines driver power requirement and switching speed in hard-switched applications.
t_r/t_f	15/15 ns - Rise/fall times with R_G = 4.7 Ω; enables sub-100 ns switching transitions in high-frequency SMPS.
t_rr	45 ns - Reverse recovery time under specified di/dt and temperature; limits diode-related switching losses.

Pinout & Package

STU90N4F3 is housed in an IPAK (TO-251) package - a surface-mount variant of TO-220 with isolated tab, offering 1.36 °C/W junction-to-case thermal resistance and compatibility with standard through-hole footprint layouts.

Pin/Terminal	Circuit Role	Design Meaning
1 (Source)	Power return path for drain current	Connected directly to PCB ground plane; carries full load current and must be routed with low-inductance copper pour.
2 (Gate)	Control terminal for channel modulation	High-impedance input requiring low-ESR gate resistor (e.g., 4.7 Ω) to damp ringing and control dV/dt during switching.
3 (Drain)	Main power output terminal	Internally connected to the exposed metal tab; electrically tied to high-side switch node or bus rail; requires isolation from heatsink unless tab is grounded.

Key Features

Feature	Design Value
STripFET™ III technology	Enables 6.2 mΩ R_DS(on) in IPAK without sacrificing SOA - delivers higher current density than prior-generation STripFET II devices.
Standard gate threshold (2–4 V)	Directly compatible with 3.3 V and 5 V microcontrollers and gate drivers - eliminates external level shifters in low-voltage control systems.
100% avalanche tested	Guarantees single-pulse E_AS ≥ 400 mJ per unit - provides design margin against voltage spikes in inductive load switching.
Low Q_gd/Q_g ratio (8/54 nC)	Reduces Miller effect and improves immunity to false turn-on during high dV/dt commutation - critical for half-bridge high-side operation.

Applications

DC-DC Buck Converter

Brushed DC Motor Drive

Use Scenario: 24 V input, 5–12 V output, 40 A continuous buck regulator for industrial PLC I/O modules.

IC Role / Device Role / Timing Role: High-side synchronous rectifier MOSFET operating at 100 kHz with forced PWM control.

Use Value: 6.2 mΩ R_DS(on) limits conduction loss to ≤1 W at 40 A, while 54 nC Q_g allows clean 20 ns switching edges with minimal gate driver dissipation.

Use Scenario: H-bridge driver for 24 V, 30 A brushed DC motors in automated gate actuators.

IC Role / Device Role / Timing Role: Low-side switching element handling bidirectional current with integrated body diode freewheeling.

Use Value: 45 ns t_rr and 60 nC Q_rr minimize diode recovery losses during direction reversal, reducing MOSFET heating by >15% vs. generic 40 V FETs.

AC-DC PFC Front-End

Industrial Solenoid Driver

Use Scenario: Boost switch in active PFC stage of 1 kW server PSU operating at 65 kHz.

IC Role / Device Role / Timing Role: Main switching transistor subjected to high dv/dt (≤8 V/ns) and repetitive avalanche stress.

Use Value: Rated dv/dt capability of 8 V/ns and 400 mJ E_AS ensure reliable operation under line surge and zero-crossing transients without snubber circuits.

Use Scenario: High-duty-cycle solenoid control in pneumatic valve manifolds (24 V, 15 A, 50% duty).

IC Role / Device Role / Timing Role: Fast-turn-off switch suppressing inductive kickback via controlled diode recovery.

Use Value: 320 A pulsed I_SDM rating withstands peak turn-off currents; 1.5 V V_SD forward drop reduces clamping energy dissipation in flyback diodes.

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel 40 V power MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP90N4F3	Same die, TO-220 package; R_DS(on) max = 6.2 mΩ, but R_thj-case = 1.36 °C/W identical; lead-free, RoHS-compliant.	Through-hole mounting only; requires vertical heatsinking and manual assembly; no SMT reflow compatibility.	Select when board space permits through-hole layout and mechanical stability outweighs assembly cost.
IRF3205	Legacy 55 V device; R_DS(on) = 8.0 mΩ @ 10 V, Q_g = 71 nC, t_r = 35 ns - slower, higher loss, less rugged (E_AS not specified).	Not rated for 100 kHz switching; unsuitable for high-di/dt PFC or motor phase-legs due to longer t_r/t_f.	Acceptable only for low-frequency (<50 kHz), low-efficiency legacy designs where cost is primary constraint.

Compared with STP90N4F3, STU90N4F3 offers identical electrical specs in a surface-mount IPAK package - enabling automated assembly and improved thermal interface to PCB copper. Versus IRF3205, it delivers 22% lower R_DS(on), 24% lower Q_g, and guaranteed avalanche ruggedness - essential for modern high-density, high-efficiency power stages.

Availability

STU90N4F3 is available at Aetrix Electronics and suitable for DC-DC converters, brushed motor drives, industrial solenoid controllers, and AC-DC PFC front-ends requiring stable component supply across multi-year production cycles.

Supply support for STU90N4F3 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, digital, and mixed-signal ICs, discrete power devices, and MEMS sensors for industrial, automotive, and consumer markets.

STU90N4F3 belongs to the STripFET™ III Power MOSFET product line - engineered specifically for high-current, high-frequency switching applications demanding low R_DS(on), fast switching, and robust avalanche capability in compact packages.

FAQ

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

The STU90N4F3 supports 65 A continuous drain current when the case temperature is maintained at 100 °C, as defined in Table 2 of the datasheet. This derating reflects thermal limitations of the IPAK package and must be validated using actual board-level thermal measurements under worst-case ambient conditions.

Is the IPAK package lead-free and RoHS compliant?

Yes, the STU90N4F3 IPAK package is manufactured with lead-free terminations and complies with EU RoHS Directive 2011/65/EU and ST's ECOPACK® environmental standards. The device is qualified for Pb-free reflow soldering per JEDEC J-STD-020, with peak temperature tolerance up to 260 °C.

Does STU90N4F3 require a gate resistor for stable switching?

Yes - a gate resistor (typically 4.7 Ω) is required to control dV/dt, suppress oscillation, and limit peak gate current. The datasheet specifies switching times (t_d(on), t_r, etc.) measured with R_G = 4.7 Ω; omitting it risks shoot-through, electromagnetic interference, and gate oxide stress.

Can STU90N4F3 replace STP90N4F3 in existing TO-220 layouts?

No - STU90N4F3 uses IPAK (TO-251), which has different pin spacing, pad layout, and thermal pad configuration than TO-220. While both share identical silicon and R_DS(on), direct replacement requires PCB redesign to accommodate the surface-mount footprint and thermal land pattern.

STU90N4F3 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: STripFET™ III

Package/Case:: TO-251-3 Short Leads, IPAK, TO-251AA

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 40 V

Current - Continuous Drain (Id) @ 25°C:: 80A (Tc)

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

Rds On (Max) @ Id, Vgs:: 6.5mOhm @ 40A, 10V

Vgs(th) (Max) @ Id:: 4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 54 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 2200 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 110W (Tc)

Operating Temperature:: -55°C ~ 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: IPAK

STU90N4F3 FAQ

1.How can I place an order for STU90N4F3 through Aetrix?

Please submit a Request for Quotation (RFQ) for STU90N4F3 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 STU90N4F3 reliable?

The price and inventory of STU90N4F3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STU90N4F3 is usually 5 days.

3.What payment methods are accepted for STU90N4F3?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STU90N4F3 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STU90N4F3?

STU90N4F3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STU90N4F3 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 STU90N4F3?

For technical support, including STU90N4F3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STU90N4F3 requirements.

6.How does Aetrix verify that STU90N4F3 is sourced from the original manufacturer or authorized distributors?

All STU90N4F3 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 STU90N4F3 meets industry standards.

7.What is the process for return or replacement of STU90N4F3?

All STU90N4F3 units undergo pre-shipment inspection (PSI). If there is an issue with STU90N4F3, 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 STU90N4F3 part is unused and in its original packaging.

Return procedure for STU90N4F3:

1.Submit a request within 90 days.

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

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