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

STMicroelectronics STL320N4LF8

Name: STL320N4LF8
Brand: STMicroelectronics
SKU: STL320N4LF8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STL320N4LF8

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: 8-PowerDFN

Datasheet:: STL320N4LF8.pdf

Description:: AUTOMOTIVE-GRADE N-CHANNEL 40 V

Quantity:: RFQ Add To RFQ list

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Inventory:5,965

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Product details

Overview

STL320N4LF8 from STMicroelectronics is an N-channel enhancement-mode logic-level Power MOSFET in PowerFLAT 5x6 package, rated for 40 V V_DS, 0.8 mΩ max. R_DS(on) at V_GS = 10 V, and 360 A continuous drain current at T_C = 25 °C. It employs STripFET F8 trench technology for ultra-low conduction loss and fast switching in high-current DC-DC converters and motor drives.

For engineers reviewing the STL320N4LF8 datasheet, STL320N4LF8 pinout, STL320N4LF8 application, or STL320N4LF8 equivalent, key selection criteria include its 0.8 mΩ on-resistance, 175 °C junction rating, 100% avalanche-tested ruggedness, MSL1 moisture sensitivity, and gate threshold voltage of 1.2–2.0 V enabling direct microcontroller drive.

Technical Context

This MOSFET uses ST's STripFET F8 process with enhanced trench gate structure to minimize R_DS(on) while reducing C_iss (7657 pF), C_oss (1968 pF), and Q_g (96 nC at 0–10 V) - enabling high-frequency synchronous rectification and efficient 48 V input power stages. Its low R_thJC of 0.8 °C/W supports high-power density thermal design.

The device features a robust body diode with 135 A continuous forward current capability, 1.1 V V_SD at 60 A, and 74.4 nC Q_rr, making it suitable for hard-switched topologies where reverse recovery behavior impacts EMI and efficiency.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V - Maximum blocking voltage for 36–48 V bus applications including e-bike controllers and server VRMs.
R_DS(on) max.	0.8 mΩ at V_GS = 10 V - Enables <1.5 W conduction loss at 60 A, critical for >300 A parallel configurations.
I_D cont.	360 A at T_C = 25 °C - Supports single-device use in high-current battery disconnect switches and OR-ing circuits.
T_J max.	175 °C - Allows operation in under-hood automotive modules and industrial inverters without derating at ambient up to 105 °C.
E_AS	590 mJ - Confirmed single-pulse avalanche energy ensures reliability during inductive load switching transients.
Q_g	96 nC at V_GS = 0–10 V - Enables fast turn-on with standard gate drivers (e.g., STGAP2S), reducing switching losses below 100 ns.
R_thJC	0.8 °C/W - Enables direct heatsink mounting with minimal thermal interface resistance for compact thermal solutions.

Pinout & Package

STL320N4LF8 is housed in a surface-mount PowerFLAT 5x6 type B package with exposed drain pad for thermal and electrical performance. The package has 8 terminals arranged in two rows (4 per row), with drain connected to pins 5, 6, 7, 8; gate to pin 4; and source to pins 1, 2, 3.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3	Source	Low-inductance parallel connection to PCB ground plane; shared return path for high di/dt currents.
4	Gate	Logic-level input requiring ≤2.0 V V_GS(th); compatible with 3.3 V/5 V MCU GPIOs without level-shifting.
5, 6, 7, 8	Drain	High-current output node tied to internal die backside; must be soldered to large copper pour for thermal dissipation.

Key Features

Feature	Design Value
STripFET F8 trench architecture	Reduces R_DS(on) × Q_g figure-of-merit by 35% vs. prior generation, improving efficiency in 100–500 kHz switching.
100% avalanche tested	Guarantees minimum 590 mJ single-pulse E_AS - eliminates need for external snubbers in flyback or buck-boost designs.
MSL1 rating	Enables standard reflow assembly without baking; compatible with automated SMT lines handling high-volume automotive production.
175 °C operating temperature	Supports full-rated current in sealed enclosures (e.g., IP67 motor controllers) without thermal throttling.
Low Q_gd/Q_g ratio (7.2%)	Minimizes Miller plateau duration, improving noise immunity and enabling stable operation with fast gate drivers.

Applications

Automotive DC-DC Converters

Industrial Motor Drives

Use Scenario: 48 V–12 V bidirectional buck-boost converter in 48 V mild-hybrid vehicles.

IC Role / Device Role / Timing Role: Primary high-side synchronous rectifier switch operating at 200 kHz with 300 A peak current.

Use Value: 0.8 mΩ R_DS(on) reduces conduction loss by 42% vs. 1.4 mΩ alternatives, extending range by 1.3 km per charge cycle.

Use Scenario: Three-phase inverter stage in 7.5 kW servo drive for CNC machinery.

IC Role / Device Role / Timing Role: Low-side switching element in IGBT/MOSFET hybrid topology with 10 kHz PWM and 250 A RMS phase current.

Use Value: 175 °C T_J rating enables sustained 254 A current at 100 °C case temperature, eliminating forced air cooling.

Server VRM Power Stages

Battery Protection Circuits

Use Scenario: 40 A per phase power stage in 500 W AI accelerator card VRM supplying GPU core voltage.

IC Role / Device Role / Timing Role: High-current, low-R_DS(on) high-side switch in multiphase buck converter with 1 MHz switching frequency.

Use Value: 7657 pF C_iss and 96 nC Q_g allow clean 10 ns rise time with 2 Ω gate resistor, minimizing shoot-through risk.

Use Scenario: Reverse polarity and overcurrent protection in 60 V LiFePO₄ battery packs for energy storage systems.

IC Role / Device Role / Timing Role: Single-package bidirectional protection switch with integrated body diode used in active OR-ing configuration.

Use Value: 135 A ISD rating and 1.1 V V_SD enable <1.5 W forward loss at 100 A, outperforming discrete diode+MOSFET solutions by 30% area reduction.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Infineon IPP020N04N	R_DS(on) = 0.95 mΩ (min. 0.25 V_GS margin); Q_g = 105 nC; same PowerSO-10 package but larger footprint.	Higher gate charge increases driver loss; requires larger PCB area due to TO-263-3 footprint.	Prefer STL320N4LF8 when board space and switching efficiency are constrained.
Vishay SiR626DP	R_DS(on) = 0.75 mΩ (tighter spec), but only rated to 150 °C T_J; no 100% avalanche test data published.	Limited high-temp reliability in sealed automotive modules; lacks documented E_AS validation.	Prefer STL320N4LF8 for mission-critical 175 °C environments requiring guaranteed avalanche ruggedness.

Compared with IPP020N04N and SiR626DP, STL320N4LF8 delivers superior thermal robustness (175 °C), verified avalanche capability (590 mJ), and smaller PowerFLAT 5x6 footprint - making it optimal for space-constrained, high-reliability 48 V power systems.

Availability

STL320N4LF8 is available at Aetrix Electronics and suitable for automotive DC-DC converters, industrial motor drives, and server VRM power stages requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for STL320N4LF8 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, MEMS, power, and microcontroller products for industrial, automotive, and consumer markets.

This device belongs to ST's STripFET™ F8 Power MOSFET product line, engineered specifically for high-efficiency, high-current switching in 12–48 V battery-powered systems and next-generation power supplies.

FAQ

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

The STL320N4LF8 supports 254 A continuous drain current at T_C = 100 °C, as specified in Table 1 of DS13908 Rev 2. This value is derived from silicon-limited current capability and assumes proper PCB copper area for thermal conduction per the recommended footprint in Figure 18.

Is this MOSFET suitable for gate-driving directly from a 3.3 V microcontroller?

Yes - its gate threshold voltage V_GS(th) ranges from 1.2 V to 2.0 V, and R_DS(on) is characterized down to V_GS = 4.5 V (0.85–1.15 mΩ). At 3.3 V, it operates in linear region but delivers usable 100+ A current with acceptable on-resistance for many protection and soft-start applications.

Does STL320N4LF8 have integrated ESD protection on the gate?

No - the device does not include on-die ESD protection circuitry. Per Section 1 of DS13908, gate-source voltage must remain within ±20 V absolute maximum rating. External gate resistors (≥10 Ω) and TVS diodes are recommended for handling system-level ESD events per IEC 61000-4-2.

What is the safe operating area (SOA) limitation at 100 µs pulse width?

At t_p = 100 µs, the SOA curve (Figure 3) limits operation to ≤100 A at 40 V V_DS for single-pulse conditions at T_J ≤ 175 °C. This reflects R_DS(on)-limited conduction, not thermal runaway, and assumes adequate PCB thermal mass to absorb transient energy.

STL320N4LF8 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-PowerDFN

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 40 V

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

Drive Voltage (Max Rds On, Min Rds On):: -

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

Vgs(th) (Max) @ Id:: -

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

Vgs (Max):: -

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

FET Feature:: -

Power Dissipation (Max):: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PowerFlat™ (5x6)

STL320N4LF8 FAQ

1.How can I place an order for STL320N4LF8 through Aetrix?

Please submit a Request for Quotation (RFQ) for STL320N4LF8 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 STL320N4LF8 reliable?

The price and inventory of STL320N4LF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STL320N4LF8 is usually 5 days.

3.What payment methods are accepted for STL320N4LF8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STL320N4LF8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STL320N4LF8?

STL320N4LF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STL320N4LF8 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 STL320N4LF8?

For technical support, including STL320N4LF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STL320N4LF8 requirements.

6.How does Aetrix verify that STL320N4LF8 is sourced from the original manufacturer or authorized distributors?

All STL320N4LF8 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 STL320N4LF8 meets industry standards.

7.What is the process for return or replacement of STL320N4LF8?

All STL320N4LF8 units undergo pre-shipment inspection (PSI). If there is an issue with STL320N4LF8, 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 STL320N4LF8 part is unused and in its original packaging.

Return procedure for STL320N4LF8:

1.Submit a request within 90 days.

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

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