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

STMicroelectronics STD46P4LLF6

Name: STD46P4LLF6
Brand: STMicroelectronics
SKU: STD46P4LLF6
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STD46P4LLF6

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: STD46P4LLF6.pdf

Description:: MOSFET P-CH 40V 46A DPAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STD46P4LLF6 from STMicroelectronics is a P-channel enhancement-mode Power MOSFET in DPAK (TO-252) package, rated for 40 V V_DS, 46 A continuous drain current at T_C = 25 °C, and 0.0125 Ω typical R_DS(on) at V_GS = 10 V. It employs STripFET™ F6 trench-gate technology and delivers high avalanche ruggedness for robust switching in automotive body control modules and industrial power supplies.

For engineers reviewing the STD46P4LLF6 datasheet, STD46P4LLF6 pinout, STD46P4LLF6 application, or STD46P4LLF6 equivalent, key selection criteria include its low gate charge (34 nC), fast switching (t_d(off) = 170 ns), integrated source-drain diode with 29 ns t_rr, and thermal resistance of 2.14 °C/W - all critical for high-efficiency DC-DC converters and load-switching designs.

Technical Context

This P-channel MOSFET operates with reversed polarity conventions: V_GS negative relative to source, ID flowing from source to drain. Its STripFET™ F6 process enables ultra-low R_DS(on) while maintaining high dV/dt immunity and unclamped inductive switching capability up to 184 A pulsed current.

The device features a monolithic source-drain diode with 1.1 V forward voltage at 23 A and 27.6 nC reverse recovery charge, enabling synchronous rectification in buck converters without external Schottky diodes. Thermal design is supported by a junction-to-case resistance of 2.14 °C/W and maximum operating junction temperature of 175 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V - Maximum blocking voltage for 12–24 V automotive and industrial rail applications
R_DS(on) typ.	0.0125 Ω @ V_GS = 10 V - Enables <1.2 W conduction loss at 46 A, reducing heatsink requirements
I_D cont.	46 A @ T_C = 25 °C - Supports high-current load switching in battery management and motor drivers
Q_g	34 nC - Low gate drive power loss enables efficient operation with standard 5 V or 3.3 V logic-level drivers
t_r/t_f	60.6 ns / 20 ns - Fast edge rates minimize switching losses in PWM frequencies up to 500 kHz
t_rr	29 ns - Short reverse recovery time reduces cross-conduction loss in synchronous buck topologies
R_thj-case	2.14 °C/W - Allows direct mounting to PCB copper pour or small heatsink for thermally constrained layouts

Pinout & Package

STD46P4LLF6 uses the DPAK (TO-252) surface-mount package with exposed drain tab for thermal and electrical connection. The package has three terminals: Gate (G), Source (S), and Drain (D), where the large metal tab is electrically connected to the Drain terminal and serves as primary heat path.

Pin/Terminal	Circuit Role	Design Meaning
G (Pin 1)	Gate control input	Accepts negative V_GS to turn on; requires level-shifting circuitry when driven from ground-referenced controllers
S (Pin 3)	Source node	Common reference point for gate drive and load return; tied to positive rail in high-side switch configurations
D (Pin 2, Tab)	Drain output / thermal pad	Connected to load or ground; large copper area provides low-inductance current path and primary thermal dissipation route

Key Features

Feature	Design Value
STripFET™ F6 trench-gate structure	Delivers lowest R_DS(on) per mm² among ST's P-channel DPAK MOSFETs, improving power density
High avalanche energy rating	Withstands unclamped inductive switching events up to 184 A peak, eliminating need for external snubbers in relay drivers
Low Q_gd/Q_gs ratio	13.8 nC / 11.3 nC - Reduces Miller-induced shoot-through risk in half-bridge configurations
ECOPACK® compliant packaging	Meets RoHS and halogen-free requirements without compromising thermal or mechanical performance

Applications

Automotive Body Control Module

Industrial DC-DC Converter

Use Scenario: High-side load switching for headlights, HVAC actuators, and door locks in 12 V systems.

IC Role / Device Role: P-channel high-side switch replacing mechanical relays to reduce EMI and improve lifetime.

Use Value: 0.0125 Ω R_DS(on) limits voltage drop to <0.57 V at 46 A, minimizing power loss and thermal stress in confined enclosures.

Use Scenario: Synchronous rectification in non-isolated buck converters for PLC I/O power rails.

IC Role / Device Role: Low-side synchronous rectifier paired with N-channel high-side switch.

Use Value: 29 ns t_rr and 27.6 nC Q_rr reduce dead-time losses and improve efficiency above 92% at 20 A output.

Server Board Power Sequencing

Smart Home Load Management

Use Scenario: Controlled hot-swap insertion of peripheral cards using soft-start and current limiting.

IC Role / Device Role: Load switch with integrated overcurrent protection via external sense resistor feedback.

Use Value: 175 °C max junction temperature and 2.14 °C/W R_thj-case support reliable operation under sustained 32.5 A loads at 100 °C case temperature.

Use Scenario: Solid-state replacement for electromechanical relays in smart lighting and appliance control panels.

IC Role / Device Role: Low-voltage P-channel switch controlled directly by MCU GPIO with simple level-shifting.

Use Value: 34 nC total gate charge allows full turn-on with <1 mA average gate drive current at 100 kHz PWM, easing MCU resource usage.

Equivalent & Alternatives

The following parts are listed as comparable options for similar P-channel power switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRF4905PBF	R_DS(on) = 0.02 Ω @ V_GS = −10 V; higher Q_g = 120 nC; TO-220 package	Requires larger heatsink and slower switching; suitable only for <100 kHz operation	Prefer STD46P4LLF6 for space-constrained SMT designs needing faster switching and lower conduction loss.
DMT6009LPS-13	R_DS(on) = 0.0095 Ω @ V_GS = −4.5 V; SO-8 package; lower I_D = 30 A	Limited to lower-current applications; no exposed drain tab for thermal relief	Choose STD46P4LLF6 when >30 A continuous current or enhanced thermal performance is required.

Compared with IRF4905PBF and DMT6009LPS-13, STD46P4LLF6 uniquely balances ultra-low R_DS(on), moderate gate charge, and DPAK thermal capability - making it optimal for 24 V industrial switches and automotive high-side drivers where board area and thermal headroom are jointly constrained.

Availability

STD46P4LLF6 is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC-DC converters, and server power sequencing requiring stable component supply and long-term manufacturing continuity.

Supply support for STD46P4LLF6 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 microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.

STD46P4LLF6 belongs to ST's STripFET™ F6 Power MOSFET product line, engineered specifically for high-efficiency, high-reliability switching in 12–40 V systems where low R_DS(on) and robust avalanche performance are critical.

FAQ

What is the recommended gate drive voltage range for reliable turn-on?

STD46P4LLF6 requires V_GS ≤ −4.5 V for guaranteed turn-on, with full enhancement achieved at −10 V. Driving with −12 V maximizes R_DS(on) stability across temperature, but −4.5 V is sufficient for most 24 V system applications. Exceeding ±20 V absolute maximum rating risks gate oxide damage.

Can this MOSFET be used in parallel configurations?

Yes - its positive temperature coefficient of R_DS(on) (confirmed in Figure 10) ensures inherent current sharing when paralleled. Use matched layout, identical gate resistors, and Kelvin-source connections to minimize imbalance. Derate total current by 15% for thermal margin in multi-device arrays.

Does the source-drain diode support continuous conduction mode (CCM) in buck converters?

Yes - the integrated diode supports CCM operation with 1.1 V forward voltage at 23 A and 29 ns reverse recovery time. However, for >100 kHz operation or >30 A loads, external Schottky clamping may further reduce losses due to its lower V_F and zero Q_rr.

Is the DPAK drain tab electrically isolated from the PCB mounting plane?

No - the drain tab is electrically connected to Pin 2 (Drain) and must be isolated from other conductive layers using solder mask or insulating thermal pads if mounted over internal ground or power planes. Direct copper pour connection is permitted only when the drain node is at system ground potential.

STD46P4LLF6 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: STripFET™ F6

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: P-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 40 V

Current - Continuous Drain (Id) @ 25°C:: 46A (Tc)

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

Rds On (Max) @ Id, Vgs:: 15mOhm @ 23A, 10V

Vgs(th) (Max) @ Id:: 2.5V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 34 nC @ 4.5 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 3525 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 70W (Tc)

Operating Temperature:: 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

STD46P4LLF6 FAQ

1.How can I place an order for STD46P4LLF6 through Aetrix?

Please submit a Request for Quotation (RFQ) for STD46P4LLF6 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 STD46P4LLF6 reliable?

The price and inventory of STD46P4LLF6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STD46P4LLF6 is usually 5 days.

3.What payment methods are accepted for STD46P4LLF6?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STD46P4LLF6 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STD46P4LLF6?

STD46P4LLF6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STD46P4LLF6 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 STD46P4LLF6?

For technical support, including STD46P4LLF6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STD46P4LLF6 requirements.

6.How does Aetrix verify that STD46P4LLF6 is sourced from the original manufacturer or authorized distributors?

All STD46P4LLF6 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 STD46P4LLF6 meets industry standards.

7.What is the process for return or replacement of STD46P4LLF6?

All STD46P4LLF6 units undergo pre-shipment inspection (PSI). If there is an issue with STD46P4LLF6, 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 STD46P4LLF6 part is unused and in its original packaging.

Return procedure for STD46P4LLF6:

1.Submit a request within 90 days.

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

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