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STMicroelectronics STLD125N4F6AG

Name: STLD125N4F6AG
Brand: STMicroelectronics
SKU: STLD125N4F6AG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STLD125N4F6AG

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: 8-PowerWDFN

Datasheet:: STLD125N4F6AG.pdf

Description:: MOSFET N-CH 40V 120A POWERFLAT

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Product details

Overview

STLD125N4F6AG from STMicroelectronics is an automotive-grade N-channel Power MOSFET using STripFET™ F6 trench technology, rated for 40 V V_DS, 2.4 mΩ typ. R_DS(on) at V_GS = 10 V and 75 A, with 120 A continuous drain current at T_C = 25 °C. It features dual-side cooling in PowerFLAT™ 5x6 and targets high-efficiency DC-DC converters and motor control in engine management systems.

For engineers reviewing the STLD125N4F6AG datasheet, STLD125N4F6AG pinout, STLD125N4F6AG application, or STLD125N4F6AG equivalent, key selection criteria include its 1.14 °C/W bottom-side thermal resistance, 91 nC total gate charge, 150 mJ single-pulse avalanche energy, and compatibility with 6.5 V logic-level drive in space-constrained automotive power stages.

Technical Context

This MOSFET employs a trench-gate STripFET™ F6 structure optimized for low conduction and switching losses. Its dual-side cooling package enables simultaneous thermal extraction from top and bottom copper layers, supporting high-current operation up to 120 A with junction temperature sustained within –55 °C to 175 °C.

The device delivers 2.4 mΩ typical on-resistance at 10 V gate drive and maintains 2.7 mΩ at 6.5 V, enabling efficient operation with standard microcontroller GPIOs. Its 5600 pF input capacitance and 560 pF reverse transfer capacitance support fast, controlled switching in synchronous buck and half-bridge configurations.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V - Maximum blocking voltage for 12 V/24 V automotive battery rail applications
R_DS(on) typ.	2.4 mΩ at V_GS = 10 V, I_D = 75 A - Enables <1.8 W conduction loss at 75 A
I_D cont.	120 A at T_C = 25 °C - Supports high-current load switching without derating in forced-air or liquid-cooled modules
Q_g	91 nC - Reduces gate driver power demand and enables >100 kHz PWM operation with low drive loss
E_AS	150 mJ - Withstands unclamped inductive turn-off events in motor phase-legs and solenoid drivers
R_thj-c bottom	1.14 °C/W - Allows direct thermal interface to heatsink or PCB ground plane for high-power density layouts
V_GS(th)	2–4 V - Ensures reliable turn-on with 3.3 V or 5 V logic-level controllers

Pinout & Package

STLD125N4F6AG uses the PowerFLAT™ 5x6 dual side cooling package (JEDEC MO-263 variant), with exposed drain pad on both top and bottom surfaces for enhanced thermal performance. The package has no leads and is surface-mount only.

Pin/Terminal	Circuit Role	Design Meaning
S(1,2,3)	Source	Three internal source bond pads connected to common source terminal; low-inductance parallel routing for high di/dt stability
D(5,6,7,8)	Drain	Four drain terminals tied to large exposed copper area on top and bottom; primary thermal and current path to PCB heatsink
G(4)	Gate	Single gate input with low capacitance node; positioned to minimize gate loop inductance in high-frequency layouts

Key Features

Feature	Design Value
STripFET™ F6 trench architecture	Reduces R_DS(on) × Q_g figure-of-merit by >25% vs. prior F5 generation, improving efficiency in 100–500 kHz SMPS
Dual-side cooling	Enables 2× thermal dissipation vs. single-side packages-critical for under-hood ambient >125 °C
High avalanche ruggedness	Rated for 90 A repetitive avalanche current and 150 mJ single-pulse E_AS, eliminating need for external snubbers in inductive loads
Automotive qualification	AEC-Q101 qualified; supports full life-cycle reliability in engine control units, transmission control, and ADAS power stages

Applications

Engine Control Unit (ECU) Fuel Injector Driver

48 V Mild Hybrid DC-DC Converter

Use Scenario: High-speed, high-current switching of multi-hole fuel injectors in gasoline direct injection systems.

IC Role / Device Role / Timing Role: Low-side switch controlling injector coil current with <255 ns turn-off delay and 220 ns fall time.

Use Value: 2.4 mΩ R_DS(on) minimizes coil heating during dwell; 150 mJ E_AS absorbs inductive kickback without clamping diodes.

Use Scenario: Primary-side synchronous rectifier in bidirectional 48 V–12 V DC-DC converter for mild hybrid vehicles.

IC Role / Device Role / Timing Role: High-efficiency, high-current N-channel switch operating at 200 kHz with 6.5 V gate drive.

Use Value: 91 nC Q_g enables low-loss switching; 1.14 °C/W R_thj-c bottom sustains 120 A continuous current with minimal heatsink volume.

Electric Power Steering (EPS) Motor Phase Leg

On-Board Charger (OBC) AC-DC Front-End

Use Scenario: Half-bridge leg in three-phase inverter driving brushless EPS assist motor.

IC Role / Device Role / Timing Role: High-side and low-side switching element with robust body diode recovery (t_rr = 40 ns, Q_rr = 41 nC).

Use Value: Fast, soft-recovery body diode reduces shoot-through risk and EMI; 175 °C max T_J ensures operation near motor housing.

Use Scenario: Active clamp or synchronous rectification stage in OBC PFC and isolation stages.

IC Role / Device Role / Timing Role: High-reliability power switch handling 100+ A peak currents in thermally constrained enclosures.

Use Value: Dual-side cooling allows PCB-integrated thermal management; AEC-Q101 rating ensures compliance with automotive OBC safety standards.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Infineon BSC014N04LS6	R_DS(on) = 1.4 mΩ @ 10 V (lower), Q_g = 102 nC (higher), same PowerSO-10 package	Higher conduction efficiency but increased gate drive loss; less suitable for 6.5 V logic-level drive	Prefer when system prioritizes lowest R_DS(on) over gate drive simplicity and thermal symmetry
ON Semiconductor NTMFS4C09NT1G	R_DS(on) = 2.7 mΩ @ 10 V (slightly higher), Q_g = 72 nC (lower), SO-8FL package with single-side cooling	Lower gate charge improves high-frequency efficiency but limits thermal headroom above 80 A	Prefer for cost-sensitive 48 V auxiliary supplies where peak current ≤ 80 A and board-level heatsinking is limited

Compared with BSC014N04LS6 and NTMFS4C09NT1G, STLD125N4F6AG uniquely balances ultra-low R_DS(on), logic-level gate drive, dual-side thermal extraction, and AEC-Q101 qualification-making it optimal for high-current, high-temperature automotive power stages requiring long-term reliability without external thermal augmentation.

Availability

STLD125N4F6AG is available at Aetrix Electronics and suitable for engine control units, 48 V mild hybrid converters, electric power steering inverters, and on-board chargers requiring stable component supply across extended automotive product lifecycles.

Supply support for STLD125N4F6AG 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, designing and manufacturing analog, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.

The STripFET™ F6 product line delivers high-current, low-R_DS(on) MOSFETs optimized for automotive power conversion, featuring trench-gate structures and thermally enhanced packages for under-hood reliability.

FAQ

Is STLD125N4F6AG qualified to AEC-Q101?

Yes, STLD125N4F6AG is fully AEC-Q101 qualified for automotive applications. The qualification includes stress testing across temperature cycling, humidity, HTRB, and UIS, confirming suitability for engine bay and transmission control environments with junction temperatures up to 175 °C.

What is the maximum recommended gate resistor for 200 kHz switching?

For 200 kHz operation with V_GS = 10 V drive, a 10 Ω gate resistor is recommended to balance switching speed (t_d(off) ≈ 255 ns, t_f ≈ 220 ns) and gate oscillation damping. Lower values increase EMI risk; higher values raise switching losses beyond 0.35 W at 200 kHz/75 A.

Can STLD125N4F6AG be used in synchronous rectification with 3.3 V microcontroller drive?

Yes-its V_GS(th) range of 2–4 V and R_DS(on) = 2.7 mΩ at V_GS = 6.5 V enable reliable enhancement-mode operation with 3.3 V logic when paired with a gate driver buffer. Direct 3.3 V GPIO drive is not recommended due to insufficient overdrive margin at high temperature.

Does the PowerFLAT™ 5x6 dual side cooling package require solder paste on both top and bottom?

No-only the bottom exposed drain pad requires solder reflow to the PCB thermal pad. The top-side copper is non-solderable; thermal transfer occurs via conduction through the molded compound to a heatsink or adjacent metal shield, not solder attachment.

STLD125N4F6AG Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: STripFET™ F6

Package/Case:: 8-PowerWDFN

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:: 120A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 6.5V, 10V

Rds On (Max) @ Id, Vgs:: 3mOhm @ 75A, 10V

Vgs(th) (Max) @ Id:: 4V @ 1mA

Gate Charge (Qg) (Max) @ Vgs:: 91 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 5600 pF @ 10 V

FET Feature:: -

Power Dissipation (Max):: 130W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PowerFlat™ (5x6) Dual Side

STLD125N4F6AG FAQ

1.How can I place an order for STLD125N4F6AG through Aetrix?

Please submit a Request for Quotation (RFQ) for STLD125N4F6AG 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 STLD125N4F6AG reliable?

The price and inventory of STLD125N4F6AG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STLD125N4F6AG is usually 5 days.

3.What payment methods are accepted for STLD125N4F6AG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STLD125N4F6AG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STLD125N4F6AG?

STLD125N4F6AG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STLD125N4F6AG 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 STLD125N4F6AG?

For technical support, including STLD125N4F6AG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STLD125N4F6AG requirements.

6.How does Aetrix verify that STLD125N4F6AG is sourced from the original manufacturer or authorized distributors?

All STLD125N4F6AG 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 STLD125N4F6AG meets industry standards.

7.What is the process for return or replacement of STLD125N4F6AG?

All STLD125N4F6AG units undergo pre-shipment inspection (PSI). If there is an issue with STLD125N4F6AG, 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 STLD125N4F6AG part is unused and in its original packaging.

Return procedure for STLD125N4F6AG:

1.Submit a request within 90 days.

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

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