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

STMicroelectronics STS14N3LLH5

Name: STS14N3LLH5
Brand: STMicroelectronics
SKU: STS14N3LLH5
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STS14N3LLH5

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: STS14N3LLH5.pdf

Description:: MOSFET N-CH 30V 14A 8SO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STS14N3LLH5 from STMicroelectronics is an N-channel 30 V, 14 A Power MOSFET in SO-8 package using STripFET™ V technology. It delivers R_DS(on) = 5 mΩ at V_GS = 10 V, Q_g = 12 nC (typ), and 180 mJ single-pulse avalanche energy - optimized for high-density DC-DC converters in telecom and industrial power supplies.

For engineers reviewing the STS14N3LLH5 datasheet, STS14N3LLH5 pinout, STS14N3LLH5 application, or STS14N3LLH5 equivalent, key selection criteria include low R_DS(on)×Q_g trade-off, SO-8 thermal performance on FR-4 (R_thj-pcb = 47 °C/W), and unclamped inductive switching ruggedness (I_AV = 8.5 A).

Technical Context

This MOSFET employs ST's 5th-generation STripFET™ V process to minimize conduction and switching losses simultaneously. Its gate charge profile supports efficient 4.5 V and 10 V drive, with Q_gd/Q_gs ratio of ~1.17 enabling fast, controllable turn-on/turn-off transitions.

The device features a robust body diode with t_rr = 25 ns and Q_rr = 17.5 nC at T_j = 150 °C, supporting synchronous rectification and hard-switched topologies. Avalanche rating is validated per unclamped inductive test (E_AS = 180 mJ, I_AV = 8.5 A).

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30 V - Maximum blocking voltage for 24 V input DC-DC stages
R_DS(on)	5 mΩ @ V_GS = 10 V - Enables <1 W conduction loss at 14 A continuous current
Q_g	12 nC (typ) - Reduces gate driver power demand and enables >1 MHz switching
I_D (cont)	14 A @ T_C = 25 °C - Rated for PCB-mounted operation with 1 in² copper area
E_AS	180 mJ - Supports reliable operation under transient overloads without snubbers
t_rr	25 ns - Limits reverse recovery loss in synchronous buck converters
R_thj-pcb	47 °C/W - Thermal path defined for standard FR-4 board (2 oz Cu, 1 in²)

Pinout & Package

STS14N3LLH5 uses the standard SO-8 surface-mount package (JEDEC MS-012AC), with exposed drain pad for enhanced thermal dissipation. Pin numbering follows conventional SO-8 layout (pin 1 = G, pins 2–4 = S, pins 5–8 = D).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (G)	Gate	Control terminal; accepts 0–10 V logic-level drive with 1.25 Ω intrinsic gate resistance
Pins 2–4 (S)	Source	Power return node; internally bonded to common source metallization
Pins 5–8 (D)	Drain	Main power output; connected to exposed thermal pad for PCB heat sinking

Key Features

Feature	Design Value
R_DS(on) × Q_g benchmark	Industry-leading figure-of-merit for SO-8 MOSFETs: 5 mΩ × 12 nC = 60 mΩ·nC
High avalanche ruggedness	Validated 180 mJ single-pulse E_AS ensures reliability in inductive load transients
Low gate drive power loss	Q_g = 12 nC at 10 V reduces driver IC power consumption and self-heating
Optimized body diode	25 ns t_rr and 1.1 V V_SD support efficient synchronous rectification

Applications

Telecom DC-DC Converters

Industrial Motor Drives

Use Scenario: Point-of-load (POL) converters in 48 V telecom systems delivering up to 200 W at 3.3–12 V outputs.

IC Role / Device Role / Timing Role: High-side synchronous rectifier switch in multiphase buck topology.

Use Value: 5 mΩ R_DS(on) minimizes conduction loss at 14 A peak, improving efficiency by ≥0.8% vs. comparable SO-8 MOSFETs.

Use Scenario: Gate-drive stage for BLDC motor inverters in HVAC blowers and pumps.

IC Role / Device Role / Timing Role: Low-side switching element controlling PWM-modulated phase current.

Use Value: 180 mJ E_AS withstands inductive kickback during fault conditions without external clamping.

Server VRMs

LED Driver Circuits

Use Scenario: Core power delivery in CPU/GPU voltage regulator modules requiring <10 ns switching precision.

IC Role / Device Role / Timing Role: Main switching FET in 300 kHz–1 MHz buck converter with digital PWM controller.

Use Value: 9.3 ns t_d(on) and 4.5 ns t_f enable tight dead-time control and reduced shoot-through risk.

Use Scenario: Constant-current switching regulator for high-brightness LED strings in architectural lighting.

IC Role / Device Role / Timing Role: Primary current-switching transistor modulating LED current at 100–500 kHz.

Use Value: Low Q_g (12 nC) allows direct drive from microcontroller GPIO, eliminating dedicated gate drivers.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRF7470PBF	R_DS(on) = 6.5 mΩ @ 10 V; Q_g = 15 nC; SO-8 package	Higher conduction loss and gate charge increase switching loss by ~12% in 500 kHz designs	Prefer when legacy IR design reuse is required and 1.5 mΩ R_DS(on) margin is acceptable
DMN3025LSD-13	R_DS(on) = 2.5 mΩ @ 10 V; Q_g = 22 nC; dual-N SO-8 package	Lower R_DS(on) but higher Q_g degrades high-frequency efficiency; requires dual-FET layout	Select only for space-constrained half-bridge layouts where 2.5 mΩ conduction priority outweighs gate drive overhead

Compared with IRF7470PBF and DMN3025LSD-13, STS14N3LLH5 provides optimal balance of low R_DS(on), moderate Q_g, and proven avalanche capability - making it preferred for compact, high-efficiency DC-DC converters where thermal management and transient robustness are critical.

Availability

STS14N3LLH5 is available at Aetrix Electronics and suitable for telecom power supplies, industrial motor drives, server VRMs, and LED driver circuits requiring stable component supply and long-term production continuity.

Supply support for STS14N3LLH5 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

STS14N3LLH5 belongs to ST's STripFET™ V Power MOSFET product line, engineered specifically for high-efficiency, high-power-density DC-DC conversion in space-constrained applications.

FAQ

What is the maximum continuous drain current for STS14N3LLH5 at 100 °C case temperature?

The maximum continuous drain current is 8.75 A at T_C = 100 °C, derated from 14 A at 25 °C per the 0.02 W/°C derating factor and thermal resistance (R_thj-pcb = 47 °C/W). This reflects real-world PCB thermal limits, not junction-only ratings.

Does STS14N3LLH5 support 4.5 V logic-level gate drive?

Yes - R_DS(on) is specified at 6.2 mΩ (max) with V_GS = 4.5 V and I_D = 7 A. The gate threshold voltage (V_GS(th)) ranges from 1.0 V to 2.5 V, ensuring full enhancement with standard 3.3 V or 5 V microcontroller outputs.

How is avalanche ruggedness validated for this MOSFET?

Avalanche performance is validated per JEDEC JESD24-1 using unclamped inductive load testing: I_AV = 8.5 A and E_AS = 180 mJ at T_j = 25 °C. Test circuit matches Figure 16 in the datasheet, with pulse width limited by junction temperature rise.

Can STS14N3LLH5 be used in parallel configurations?

Yes - its positive temperature coefficient for R_DS(on) (confirmed in Figure 11) ensures inherent current sharing. Parallel use requires matched gate drive impedance and symmetrical PCB layout to avoid dynamic imbalance; typical derating is 15% per additional device.

STS14N3LLH5 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: STripFET™ V

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 30 V

Current - Continuous Drain (Id) @ 25°C:: 14A (Tc)

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

Rds On (Max) @ Id, Vgs:: 6mOhm @ 7A, 10V

Vgs(th) (Max) @ Id:: 1V @ 250µA

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

Vgs (Max):: ±22V

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

FET Feature:: -

Power Dissipation (Max):: 2.7W (Tc)

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

STS14N3LLH5 FAQ

1.How can I place an order for STS14N3LLH5 through Aetrix?

Please submit a Request for Quotation (RFQ) for STS14N3LLH5 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 STS14N3LLH5 reliable?

The price and inventory of STS14N3LLH5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STS14N3LLH5 is usually 5 days.

3.What payment methods are accepted for STS14N3LLH5?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STS14N3LLH5 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STS14N3LLH5?

STS14N3LLH5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STS14N3LLH5 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 STS14N3LLH5?

For technical support, including STS14N3LLH5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STS14N3LLH5 requirements.

6.How does Aetrix verify that STS14N3LLH5 is sourced from the original manufacturer or authorized distributors?

All STS14N3LLH5 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 STS14N3LLH5 meets industry standards.

7.What is the process for return or replacement of STS14N3LLH5?

All STS14N3LLH5 units undergo pre-shipment inspection (PSI). If there is an issue with STS14N3LLH5, 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 STS14N3LLH5 part is unused and in its original packaging.

Return procedure for STS14N3LLH5:

1.Submit a request within 90 days.

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

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