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

STMicroelectronics STF40NF03L

Name: STF40NF03L
Brand: STMicroelectronics
SKU: STF40NF03L
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STF40NF03L

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-220-3 Full Pack

Datasheet:: STF40NF03L.pdf

Description:: MOSFET N-CH 30V 23A TO220FP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STF40NF03L from STMicroelectronics is an N-channel enhancement-mode Power MOSFET in TO-220FP package, rated for 30 V V_DS, 23 A continuous drain current at T_C = 25 °C, and 0.022 Ω max R_DS(on) at V_GS = 10 V. It features low gate threshold (1–2.5 V), rugged unclamped inductive switching capability (250 mJ E_AS), and is optimized for high-efficiency DC-DC converters and motor control switches.

For engineers reviewing the STF40NF03L datasheet, STF40NF03L pinout, STF40NF03L application, or STF40NF03L equivalent, key selection criteria include its TO-220FP thermal resistance (R_thj-c = 6 °C/W), pulsed drain current rating (92 A), gate charge profile (Q_g = 10.5–15 nC), and integrated body diode recovery performance (t_rr = 34.5 ns).

Technical Context

This MOSFET employs ST's STripFET™ II process with single-feature-size strip geometry, enabling high cell density and low on-resistance without compromising avalanche ruggedness. Its gate threshold voltage range (1–2.5 V) supports direct drive from 3.3 V or 5 V logic, while the 0.022 Ω R_DS(on) ensures low conduction loss at 20 A.

The device is characterized for operation up to T_j = 175 °C, with specified dynamic parameters including C_iss = 770 pF, Q_gd = 4.5 nC, and t_d(on)/t_r = 14/25 ns under standard 15 V switching conditions - critical for optimizing gate driver sizing and switching loss in hard-switched topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30 V - Maximum blocking voltage in power switch position; defines use in ≤24 V systems with margin.
R_DS(on) max	0.022 Ω @ V_GS = 10 V - Conduction loss of 10.1 W at 23 A, requiring heatsinking in continuous operation.
I_D cont	23 A @ T_C = 25 °C - Continuous current rating limited by TO-220FP package thermal resistance (6 °C/W).
E_AS	250 mJ - Single-pulse avalanche energy enables robustness against inductive turn-off transients without external snubbers.
Q_g	10.5–15 nC @ V_GS = 4.5 V - Gate drive energy requirement determines minimum gate driver peak current (≥2 A for <20 ns rise time).
t_rr	34.5 ns - Fast body diode recovery reduces commutation losses and ringing in synchronous rectification or half-bridge configurations.

Pinout & Package

STF40NF03L uses a 3-pin TO-220FP (Full-Pak) package with insulated tab, where pins are arranged in linear order: Pin 1 = Gate, Pin 2 = Drain (tab-connected), Pin 3 = Source. The insulated case allows direct mounting to heatsink without isolation hardware.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Left)	Gate	Control terminal; requires ≤±16 V drive; low input capacitance (C_iss = 770 pF) eases driver selection.
Pin 2 (Center)	Drain	Main power output node; internally connected to metal tab; electrically isolated from heatsink in TO-220FP variant.
Pin 3 (Right)	Source	Power return path and reference for gate drive; common connection point for low-side switch configuration.

Key Features

Feature	Design Value
Low R_DS(on) with 30 V rating	0.022 Ω enables <10 W conduction loss at 20 A, reducing heatsink size vs. higher-R_DS(on) alternatives.
Low gate threshold voltage	V_GS(th) = 1–2.5 V allows direct interface with 3.3 V microcontrollers without level-shifting circuitry.
Rugged avalanche capability	E_AS = 250 mJ ensures reliable operation under unclamped inductive load switching without derating.
Fast body diode recovery	t_rr = 34.5 ns minimizes reverse recovery loss and EMI in high-frequency PWM applications.

Applications

Motor Drive Half-Bridge Low-Side Switch

DC-DC Synchronous Buck Converter

Use Scenario: Driving brushed DC motors in industrial actuators with PWM frequencies up to 20 kHz.

IC Role / Device Role / Timing Role: Low-side power switch controlling motor current flow; operates in hard-switched mode with gate driven by dedicated half-bridge driver.

Use Value: Low R_DS(on) reduces I²R heating during 23 A stall current; fast t_rr prevents shoot-through during dead-time transitions.

Use Scenario: High-current step-down conversion in telecom power supplies delivering 12 V @ 15 A from 24 V input.

IC Role / Device Role / Timing Role: Synchronous rectifier in buck converter output stage; commutates at 300–500 kHz with zero-voltage switching assist.

Use Value: 0.022 Ω R_DS(on) cuts conduction loss by >30% vs. 0.035 Ω alternatives; low Q_gd improves light-load efficiency.

Automotive Body Control Module Load Switch

Industrial PLC Output Driver

Use Scenario: Controlling solenoids, relays, and LED arrays in 12 V automotive BCMs with diagnostic feedback.

IC Role / Device Role / Timing Role: Protected high-side or low-side load switch; integrates overcurrent and thermal shutdown via external controller.

Use Value: 250 mJ E_AS withstands inductive kickback from 12 V solenoids; TO-220FP insulation simplifies PCB layout in space-constrained modules.

Use Scenario: Solid-state replacement for electromechanical relays in programmable logic controller output cards handling 24 V DC loads.

IC Role / Device Role / Timing Role: Final-stage power switch interfacing with opto-isolated logic; operated at <100 Hz with controlled turn-on slew rate.

Use Value: Low V_GS(th) ensures full enhancement with 5 V logic; 160 A pulsed rating supports surge currents during relay coil energization.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP40NF03L	Same die, TO-220 (non-insulated) package; R_thj-c = 1.8–2.1 °C/W vs. 6 °C/W; I_D = 40 A @ T_C = 25 °C.	Higher power dissipation capability but requires electrical isolation from heatsink; unsuitable where creepage/clearance is constrained.	Select when thermal budget permits larger heatsink and isolation is manageable; avoid in compact or safety-critical layouts.
IRF3205PBF	55 V rating, 0.008 Ω R_DS(on), TO-220; higher V_GS(th) (2–4 V); no published E_AS spec.	Better conduction loss at lower currents but less robust under inductive switching; lacks avalanche rating documentation.	Prefer only in low-voltage, non-inductive loads where avalanche immunity is not required; verify gate drive compatibility.

Compared with STP40NF03L, STF40NF03L trades 17 A continuous current and 4× better thermal resistance for electrical isolation and board-space savings; versus IRF3205PBF, it offers guaranteed avalanche ruggedness and lower gate threshold at the cost of higher R_DS(on) and narrower voltage margin.

Availability

STF40NF03L is available at Aetrix Electronics and suitable for motor drives, DC-DC converters, and industrial PLC output stages requiring stable component supply and long-term manufacturability.

Supply support for STF40NF03L 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 for automotive, industrial, and consumer markets.

The STripFET™ Power MOSFET product line targets high-efficiency, high-reliability power switching in space- and thermally-constrained applications, emphasizing ruggedness, low gate charge, and process consistency across voltage classes.

FAQ

Is STF40NF03L suitable for 24 V automotive applications?

Yes - its 30 V V_DS rating provides sufficient margin for 24 V nominal systems, including load-dump transients up to 36 V. The device is not AEC-Q101 qualified, so use requires system-level validation per ISO 16750-2. Its 175 °C max junction temperature and 250 mJ E_AS support robust operation in under-hood environments with proper thermal design.

What is the maximum safe operating frequency for STF40NF03L in a buck converter?

Based on its 14 ns turn-on delay and 25 ns rise time with 4.7 Ω gate resistor, STF40NF03L supports efficient operation up to 500 kHz in hard-switched buck converters. Above this, switching losses increase significantly due to Q_g = 10.5–15 nC and C_oss = 255 pF; soft-switching or gate drive optimization is recommended for >1 MHz designs.

Does STF40NF03L require a gate resistor, and what value is recommended?

Yes - a gate resistor is required to control dV/dt and prevent oscillation. For 12 V gate drive and 500 kHz operation, a 4.7 Ω resistor balances switching speed and EMI. Lower values (2.2–3.3 Ω) reduce losses but increase ringing risk; higher values (>10 Ω) suppress noise but raise conduction loss due to prolonged transition times.

Can STF40NF03L replace STP40NF03L in an existing design?

Only with thermal and layout review: STF40NF03L has 3× higher thermal resistance (6 vs. 2.1 °C/W), reducing max power dissipation from 70 W to 25 W at T_C = 25 °C. The insulated TO-220FP eliminates need for isolating pads but lowers current rating to 23 A. PCB footprint differs - verify mechanical fit and heatsink interface before substitution.

STF40NF03L Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: STripFET™

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

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 30 V

Current - Continuous Drain (Id) @ 25°C:: 23A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 4.5V, 10V

Rds On (Max) @ Id, Vgs:: 22mOhm @ 20A, 10V

Vgs(th) (Max) @ Id:: 2.5V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 15 nC @ 4.5 V

Vgs (Max):: ±16V

Input Capacitance (Ciss) (Max) @ Vds:: 770 pF @ 25 V

FET Feature:: -

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

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220FP

STF40NF03L FAQ

1.How can I place an order for STF40NF03L through Aetrix?

Please submit a Request for Quotation (RFQ) for STF40NF03L 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 STF40NF03L reliable?

The price and inventory of STF40NF03L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STF40NF03L is usually 5 days.

3.What payment methods are accepted for STF40NF03L?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STF40NF03L transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STF40NF03L?

STF40NF03L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STF40NF03L 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 STF40NF03L?

For technical support, including STF40NF03L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STF40NF03L requirements.

6.How does Aetrix verify that STF40NF03L is sourced from the original manufacturer or authorized distributors?

All STF40NF03L 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 STF40NF03L meets industry standards.

7.What is the process for return or replacement of STF40NF03L?

All STF40NF03L units undergo pre-shipment inspection (PSI). If there is an issue with STF40NF03L, 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 STF40NF03L part is unused and in its original packaging.

Return procedure for STF40NF03L:

1.Submit a request within 90 days.

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

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