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Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > FET, MOSFET Arrays

STMicroelectronics STL66DN3LLH5

Name: STL66DN3LLH5
Brand: STMicroelectronics
SKU: STL66DN3LLH5
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STL66DN3LLH5

Manufacturer:: STMicroelectronics

Category:: FET, MOSFET Arrays

Package:: 8-PowerVDFN

Datasheet:: STL66DN3LLH5.pdf

Description:: MOSFET 2N-CH 30V 78.5A POWERFLAT

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Product details

Overview

STL66DN3LLH5 from STMicroelectronics is an automotive-grade dual N-channel 30 V Power MOSFET in PowerFLAT™ 5x6 double island package, optimized for low R_DS(on) (5.9 mΩ typ. at V_GS = 10 V), high continuous current (20 A at T_pcb = 25 °C), and 175 °C max junction temperature. It serves as a high-efficiency synchronous rectifier or load switch in 12 V automotive power distribution systems.

For engineers reviewing the STL66DN3LLH5 datasheet, STL66DN3LLH5 pinout, STL66DN3LLH5 application, or STL66DN3LLH5 equivalent, key selection factors include its AEC-Q101 qualification, wettable flanks for automated optical inspection, logic-level gate drive compatibility (V_GS(th) = 1–3 V), and dual-die configuration enabling compact half-bridge or parallel switching layouts.

Technical Context

This dual N-channel MOSFET integrates two identical STripFET™ H5 die in a single PowerFLAT™ 5x6 double island package, sharing common source terminals and isolated drain islands. Its design targets high-density automotive power stages where thermal performance (R_thj-pcb = 32 °C/W on 1-in² 2 oz Cu) and avalanche ruggedness (E_AS = 270 mJ) are critical.

The device supports logic-level gate drive with V_GS(th) spanning 1–3 V and delivers low dynamic losses: C_iss = 1500 pF, Q_g = 12 nC, and fast switching (t_d(on) = 8.8 ns, t_f = 4 ns), enabling efficient operation in 100–500 kHz DC-DC converters and motor gate drivers.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30 V - Maximum drain-source blocking voltage for 12 V automotive battery rail applications
R_DS(on) max	6.5 mΩ @ V_GS = 10 V - Ensures ≤1.3 W conduction loss at 20 A, critical for thermal management in sealed modules
I_D cont	20 A @ T_pcb = 25 °C - Rated for sustained current on standard PCB layout without heatsink
T_j max	175 °C - Enables operation in under-hood environments per AEC-Q101 stress requirements
Q_g	12 nC - Low gate charge reduces driver power demand and enables use with low-power microcontroller GPIOs
E_AS	270 mJ - Withstands unclamped inductive switching events in motor control without failure
C_iss	1500 pF - Predictable input capacitance simplifies gate driver sizing and EMI filtering

Pinout & Package

STL66DN3LLH5 uses the PowerFLAT™ 5x6 double island WF type C package - a surface-mount, thermally enhanced, wettable flank package with exposed drain pads on both ends and a central source pad. The double island structure electrically isolates the two N-channel dies' drains while sharing a common source connection.

Pin/Terminal	Circuit Role	Design Meaning
Drain 1 (left island)	High-side switch output	Exposed copper pad for direct PCB thermal coupling; rated for 78.5 A pulsed current
Drain 2 (right island)	Low-side switch output or parallel path	Independent drain terminal enabling half-bridge topology or current sharing
Source (center pad)	Common source node	Shared source connection for both MOSFETs; must be routed to ground plane with low inductance
Gate 1	Control input for first MOSFET	Logic-compatible input requiring ≤3 V threshold; separate routing prevents crosstalk
Gate 2	Control input for second MOSFET	Independent gate terminal allows asynchronous or complementary drive configurations

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive under-hood use including temperature cycling, humidity, and mechanical shock
Wettable flanks	Vertical side-wall plating enables automated optical solder-joint inspection (AOI) in SMT lines
STripFET™ H5 technology	Enables 5.9 mΩ R_DS(on) in 5x6 mm footprint - 25% lower resistance than prior H3 generation
175 °C junction rating	Supports operation in engine control units (ECUs) and body control modules (BCMs) without derating at ambient >125 °C
Double island isolation	Prevents cross-conduction in half-bridge layouts; eliminates need for discrete isolation components

Applications

Automotive Body Control Module (BCM)

12 V DC-DC Synchronous Rectifier

Use Scenario: Controlling headlight, wiper, and door lock actuators via centralized power distribution unit.

IC Role / Device Role / Timing Role: Dual N-channel load switch providing independent ON/OFF control and short-circuit protection for multiple 12 V loads.

Use Value: Eliminates need for two discrete MOSFETs and associated gate resistors, reducing BOM count by 30% and PCB area by 40%.

Use Scenario: Secondary-side rectification in buck-derived 12 V → 5 V/3.3 V point-of-load converters for infotainment systems.

IC Role / Device Role / Timing Role: Synchronous rectifier replacing Schottky diodes to reduce conduction loss and improve efficiency above 85%.

Use Value: Achieves 2.1 W lower dissipation vs. 40 V Schottky at 20 A, enabling passive cooling in space-constrained modules.

Electric Power Steering (EPS) Motor Driver

Automotive HVAC Blower Control

Use Scenario: Half-bridge high-side/low-side switching for brushless DC motor phase control in EPS systems.

IC Role / Device Role / Timing Role: Dual-die configuration used as one half-bridge leg with isolated drains and shared source.

Use Value: Reduces layout complexity and parasitic inductance versus discrete half-bridge, improving EMI and dv/dt immunity during commutation.

Use Scenario: PWM-controlled blower motor speed regulation in climate control systems.

IC Role / Device Role / Timing Role: High-current, logic-level switch interfacing directly with MCU PWM outputs without level-shifting.

Use Value: Supports 20 A continuous current at 100% duty cycle with <1.2 °C/W effective thermal resistance when mounted on 2 oz Cu.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Infineon BSC014N04LS6	Single-channel 40 V, 1.4 mΩ, PowerSO-8 - higher voltage rating but no dual-die integration	Requires two devices + extra PCB area for dual-switch function; lacks wettable flanks	Preferred only when 40 V blocking is mandatory and board space is unconstrained
ON Semiconductor NTMFS4C026NT1G	Dual N-channel 30 V, 2.6 mΩ, PowerTDFN 5x6 - lower R_DS(on) but not AEC-Q101 qualified	Suitable for industrial/commercial DC-DC, not certified for automotive safety-critical functions	Select only for non-automotive applications where qualification is not required and lower on-resistance is prioritized

Compared with BSC014N04LS6 and NTMFS4C026NT1G, STL66DN3LLH5 uniquely combines AEC-Q101 qualification, dual-die integration in a wettable-flank package, and 30 V/5.9 mΩ performance-making it the only drop-in solution for space- and reliability-constrained automotive power stages.

Availability

STL66DN3LLH5 is available at Aetrix Electronics and suitable for automotive body control modules, 12 V DC-DC synchronous rectifiers, and electric power steering motor drivers requiring stable component supply across extended product lifecycles.

Supply support for STL66DN3LLH5 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 STL66DN3LLH5 belongs to ST's STripFET™ H5 Power MOSFET product line, engineered specifically for high-efficiency, high-reliability automotive power switching where thermal robustness, AEC-Q101 compliance, and compact dual-die integration are essential.

FAQ

What is the maximum continuous drain current for STL66DN3LLH5 at 100 °C PCB temperature?

The maximum continuous drain current is 14.2 A when mounted on a 1-inch² FR-4 board with 2 oz copper at T_pcb = 100 °C. This value is derived from thermal resistance R_thj-pcb = 32 °C/W and maximum junction temperature of 175 °C, ensuring safe operation under sustained high-temperature conditions typical in automotive under-hood environments.

Does STL66DN3LLH5 support logic-level gate drive from a 3.3 V microcontroller?

Yes - its gate threshold voltage V_GS(th) ranges from 1 V to 3 V, and R_DS(on) remains 7.9 mΩ max at V_GS = 4.5 V and ID = 10 A. A 3.3 V GPIO can fully enhance the device in low-current switching roles, though for 20 A continuous operation, 5 V or higher gate drive is recommended to minimize conduction loss.

How does the PowerFLAT™ 5x6 double island package improve thermal performance over standard SO-8?

The PowerFLAT™ 5x6 double island package provides 2× larger exposed copper area than SO-8 and eliminates plastic body thermal bottlenecks. Its R_thj-pcb = 32 °C/W (vs. ~60 °C/W for SO-8) enables 40% higher power density, while wettable flanks ensure reliable solder joint formation for consistent heat transfer to the PCB ground plane.

Is STL66DN3LLH5 suitable for reverse polarity protection circuits?

Yes - its integrated source-drain diode has V_SD = 1.1 V at 19 A and t_rr = 24 ns, enabling fast, low-loss reverse current blocking. When used in back-to-back configuration with another MOSFET, it achieves <50 mΩ total forward resistance and eliminates diode voltage drop, improving system efficiency by up to 1.2% in 12 V battery-fed systems.

STL66DN3LLH5 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: STripFET™ V

Package/Case:: 8-PowerVDFN

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: MOSFET (Metal Oxide)

Configuration:: 2 N-Channel (Dual)

FET Feature:: Logic Level Gate

Drain to Source Voltage (Vdss):: 30V

Current - Continuous Drain (Id) @ 25°C:: 78.5A

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

Vgs(th) (Max) @ Id:: 3V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 12nC @ 4.5V

Input Capacitance (Ciss) (Max) @ Vds:: 1500pF @ 25V

Power - Max:: 72W

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: PowerFlat™ (5x6)

STL66DN3LLH5 FAQ

1.How can I place an order for STL66DN3LLH5 through Aetrix?

Please submit a Request for Quotation (RFQ) for STL66DN3LLH5 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 STL66DN3LLH5 reliable?

The price and inventory of STL66DN3LLH5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STL66DN3LLH5 is usually 5 days.

3.What payment methods are accepted for STL66DN3LLH5?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STL66DN3LLH5 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STL66DN3LLH5?

STL66DN3LLH5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STL66DN3LLH5 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 STL66DN3LLH5?

For technical support, including STL66DN3LLH5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STL66DN3LLH5 requirements.

6.How does Aetrix verify that STL66DN3LLH5 is sourced from the original manufacturer or authorized distributors?

All STL66DN3LLH5 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 STL66DN3LLH5 meets industry standards.

7.What is the process for return or replacement of STL66DN3LLH5?

All STL66DN3LLH5 units undergo pre-shipment inspection (PSI). If there is an issue with STL66DN3LLH5, 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 STL66DN3LLH5 part is unused and in its original packaging.

Return procedure for STL66DN3LLH5:

1.Submit a request within 90 days.

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

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