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STMicroelectronics STL70N4LLF5

Name: STL70N4LLF5
Brand: STMicroelectronics
SKU: STL70N4LLF5
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STL70N4LLF5

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: 8-PowerVDFN

Datasheet:: STL70N4LLF5.pdf

Description:: MOSFET N-CH 40V 70A POWERFLAT

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Product details

Overview

STL70N4LLF5 from STMicroelectronics is an automotive-grade N-channel Power MOSFET using STripFET™ F5 technology, rated for 40 V V_DS, 6.1 mΩ typ. R_DS(on) at V_GS = 10 V and 9 A, with 18 A continuous drain current at T_pcb = 25 °C. It serves as a high-efficiency, low-loss main or synchronous rectifier switch in DC-DC converters and motor drivers.

For engineers reviewing the STL70N4LLF5 datasheet, STL70N4LLF5 pinout, STL70N4LLF5 application, or STL70N4LLF5 equivalent, key selection criteria include its AEC-Q101 qualification, wettable flank PowerFLAT™ 5x6 package for automated optical inspection, 470 mJ single-pulse avalanche energy, and gate charge profile optimized for 4.5 V logic-level drive in space-constrained automotive power stages.

Technical Context

This MOSFET employs ST's STripFET™ F5 process to minimize conduction loss while maintaining robust avalanche capability. Its 6.1 mΩ typ. on-resistance at 10 V gate drive and 7.6 mΩ at 4.5 V enables efficient operation in 12 V automotive systems with standard or low-voltage microcontroller outputs.

The device features a single-island PowerFLAT™ 5x6 WF type C package with exposed drain pad and wettable flanks, delivering 2.08 °C/W junction-to-case thermal resistance and enabling high-current PCB mounting without heatsink. Its 12.9 nC total gate charge and 5.3 nC gate-drain charge support fast switching with minimal driver loss.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V - Maximum blocking voltage for 12 V battery rail applications with load dump margin
R_DS(on) typ.	6.1 mΩ @ V_GS = 10 V, I_D = 9 A - Enables <1 W conduction loss at 18 A in optimized layout
I_D cont. (T_pcb = 25 °C)	18 A - Sustained current rating on standard FR-4 board (1 inch², 2 oz Cu)
E_AS	470 mJ - Single-pulse avalanche energy supports unclamped inductive switching in motor control
Q_g	12.9 nC - Total gate charge determines driver power requirement and switching speed trade-off
R_thj-pcb	31.3 °C/W - Thermal resistance from junction to PCB, critical for thermal design without heatsink
V_GS(th)	1–2.5 V - Gate threshold range ensures reliable turn-on with 3.3 V or 5 V logic-level controllers

Pinout & Package

STL70N4LLF5 uses the PowerFLAT™ 5x6 single-island WF type C package: 5.0–5.4 mm × 6.2–6.6 mm footprint, 0.8–1.0 mm height, with exposed drain pad on bottom and wettable flank leads for solder joint inspection.

Pin/Terminal	Circuit Role	Design Meaning
Drain (Pad)	Main current path output	Exposed copper pad on underside - primary thermal and current path to PCB ground plane
Source (S1–S3)	Current return / reference node	Three side terminals tied internally - low-inductance source connection for gate loop stability
Gate (G)	Control input	Single side terminal - isolated high-impedance input requiring <13 nC charge for full enhancement

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive temperature cycling, humidity, and mechanical stress per JESD47
Wettable flank leads	Enables automated optical inspection (AOI) of solder fillets on all four side terminals
High avalanche ruggedness	9 A non-repetitive avalanche current and 470 mJ E_AS support inductive load switching without snubbers
Low gate drive power loss	12.9 nC Q_g and 1.5 Ω R_G reduce driver IC power dissipation and enable higher PWM frequencies
Optimized FoM (R_DS(on) × Q_g)	~78 mΩ·nC - Among best-in-class for 40 V automotive MOSFETs, balancing conduction and switching loss

Applications

Automotive Body Control Module (BCM)

12 V DC-DC Buck Converter

Use Scenario: Driving high-current solenoids and lamps in door modules and seat controls.

IC Role / Device Role / Timing Role: High-side or low-side power switch controlling up to 18 A loads with PWM dimming or timed actuation.

Use Value: 6.1 mΩ R_DS(on) minimizes heat generation in sealed enclosures; AEC-Q101 ensures reliability over 15-year vehicle life.

Use Scenario: Main synchronous rectifier in 12 V input, 3.3/5 V output buck converter for ADAS camera or infotainment supply.

IC Role / Device Role / Timing Role: Secondary-side switch operating at 300–500 kHz with 4.5 V gate drive from controller.

Use Value: Low Q_gd/Q_g ratio (41%) reduces Miller-induced shoot-through risk; wettable flanks ensure solder joint integrity under thermal cycling.

Electric Power Steering (EPS) Motor Driver

Automotive HVAC Blower Control

Use Scenario: Half-bridge leg in 3-phase inverter driving brushless EPS motor (≤500 W).

IC Role / Device Role / Timing Role: Low-side switch handling 44 A peak current at T_C = 100 °C with fast 5.2 ns fall time.

Use Value: 2.08 °C/W R_thj-case allows direct PCB copper pour cooling; 27.2 ns t_rr limits reverse recovery loss during commutation.

Use Scenario: PWM-controlled blower motor driver in climate control system.

IC Role / Device Role / Timing Role: High-current, high-duty-cycle switch managing 15–20 A resistive-inductive load.

Use Value: 470 mJ E_AS withstands back-EMF spikes during abrupt shutdown; 1.1 V V_SD forward drop reduces body diode conduction loss during dead-time.

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
Infineon BSC014N04LS6	R_DS(on) = 1.4 mΩ @ 10 V (lower), Q_g = 22.5 nC (higher), PowerSO-10 package	Higher current density but larger footprint and no wettable flanks	Prefer when lower conduction loss dominates; avoid if AOI or space constraints apply
ON Semiconductor NTMFS4C09NT1G	R_DS(on) = 5.2 mΩ @ 10 V, Q_g = 11.5 nC, SO-8FL package	Smaller SO-8FL footprint, lower gate charge, but only 12 A I_D (T_pcb)	Prefer for cost-sensitive, lower-current (<15 A) designs where thermal headroom is available

Compared with BSC014N04LS6 and NTMFS4C09NT1G, STL70N4LLF5 uniquely balances 18 A PCB-limited current, AEC-Q101 compliance, wettable flank inspection, and 470 mJ avalanche energy-making it optimal for mid-power automotive switches where reliability, manufacturability, and ruggedness are jointly prioritized.

Availability

STL70N4LLF5 is available at Aetrix Electronics and suitable for automotive body control modules, 12 V DC-DC converters, and electric power steering subsystems requiring stable component supply across extended production lifecycles.

Supply support for STL70N4LLF5 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, specializing in automotive, industrial, and power management solutions with vertical manufacturing and broad analog/mixed-signal IP.

The STL70N4LLF5 belongs to ST's STripFET™ F5 automotive MOSFET product line, engineered specifically for high-reliability, high-current switching in 12 V vehicle electrical systems where thermal robustness and process consistency are mandatory.

FAQ

Is STL70N4LLF5 suitable for 48 V mild-hybrid systems?

No. Its 40 V V_DS rating provides only marginal margin above 48 V nominal bus voltage and does not meet ISO 16750-2 load dump requirements for 48 V architectures. It is designed exclusively for 12 V automotive systems with up to 40 V transient tolerance.

What is the maximum recommended PCB copper area for thermal performance?

ST specifies thermal data for a 1 inch² (645 mm²), 2 oz Cu FR-4 board. Doubling copper area to 2 inch² improves R_thj-pcb by ~20%, but layout must maintain symmetric thermal paths to the exposed drain pad and avoid isolation gaps beneath the package.

Does the device require a gate resistor for safe operation?

Yes. A gate resistor (typically 4.7–10 Ω) is required to dampen ringing and control dV/dt during switching. The 1.5 Ω internal gate resistance alone is insufficient to prevent oscillation with typical PCB trace inductance and driver output impedance.

Can STL70N4LLF5 be used in parallel configurations?

Yes, but only with matched devices, symmetrical PCB layout, individual gate resistors, and current-sharing verification. Its positive temperature coefficient of R_DS(on) supports inherent current balancing above 100 °C, but gate charge mismatch may cause dynamic imbalance at turn-on.

STL70N4LLF5 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: STripFET™ V

Package/Case:: 8-PowerVDFN

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:: 70A (Tc)

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

Rds On (Max) @ Id, Vgs:: 6.5mOhm @ 9A, 10V

Vgs(th) (Max) @ Id:: 1V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 13 nC @ 4.5 V

Vgs (Max):: ±22V

Input Capacitance (Ciss) (Max) @ Vds:: 1800 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 72W (Tc)

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount, Wettable Flank

Supplier Device Package:: PowerFlat™ (5x6)

STL70N4LLF5 FAQ

1.How can I place an order for STL70N4LLF5 through Aetrix?

Please submit a Request for Quotation (RFQ) for STL70N4LLF5 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 STL70N4LLF5 reliable?

The price and inventory of STL70N4LLF5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STL70N4LLF5 is usually 5 days.

3.What payment methods are accepted for STL70N4LLF5?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STL70N4LLF5 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STL70N4LLF5?

STL70N4LLF5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STL70N4LLF5 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 STL70N4LLF5?

For technical support, including STL70N4LLF5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STL70N4LLF5 requirements.

6.How does Aetrix verify that STL70N4LLF5 is sourced from the original manufacturer or authorized distributors?

All STL70N4LLF5 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 STL70N4LLF5 meets industry standards.

7.What is the process for return or replacement of STL70N4LLF5?

All STL70N4LLF5 units undergo pre-shipment inspection (PSI). If there is an issue with STL70N4LLF5, 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 STL70N4LLF5 part is unused and in its original packaging.

Return procedure for STL70N4LLF5:

1.Submit a request within 90 days.

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

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