Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

STMicroelectronics STS17NF3LL

Name: STS17NF3LL
Brand: STMicroelectronics
SKU: STS17NF3LL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: STS17NF3LL

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

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

Datasheet:: STS17NF3LL.pdf

Description:: MOSFET N-CH 30V 17A 8SO

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:8,010

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

STS17NF3LL from STMicroelectronics is an N-channel 30V Power MOSFET in SO-8 package, optimized for high-efficiency DC-DC converters with R_DS(on) = 0.0045Ω @ V_GS = 10V, I_D = 8.5A, Q_g = 26nC @ V_GS = 4.5V, and T_j range of –55°C to 175°C. It serves as a synchronous rectifier or main switch in telecom and computing power supplies.

For engineers reviewing the STS17NF3LL datasheet, STS17NF3LL pinout, STS17NF3LL application, or STS17NF3LL equivalent, key selection criteria include low conduction loss (R_DS(on) < 5.5mΩ @ 4.5V), fast switching (t_r = 39ns, t_f = 37ns), gate charge efficiency (Q_gd/Q_g = 46%), and SO-8 thermal performance (R_thj-lead = 16°C/W).

Technical Context

This STripFET™ II device uses ST's Single Feature Size™ strip-based process to achieve optimal R_DS(on) × Q_g trade-off at 4.5V drive-critical for 12V-input buck converters operating at 300–1000kHz. Its low reverse transfer capacitance (C_rss = 98pF) minimizes Miller-induced shoot-through risk in synchronous topologies.

The MOSFET integrates a robust body diode with t_rr = 39ns and Q_rr = 45nC at T_j = 150°C, enabling efficient freewheeling in non-isolated DC-DC stages. Thermal resistance junction-to-leads (16°C/W) supports >12A continuous current at T_C = 100°C without heatsinking on standard FR-4 PCBs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30V - Supports input rails up to 24V nominal with 25% margin for transients in telecom systems.
R_DS(on) @ 10V	0.0045Ω - Enables <150mW conduction loss at 17A, critical for high-current POL converters.
R_DS(on) @ 4.5V	0.0055Ω - Ensures stable on-resistance under logic-level gate drive from PWM controllers.
Q_g	26nC - Reduces gate drive power and enables use with low-current drivers (e.g., UC384x family).
t_r/t_f	39ns/37ns - Limits switching transition time to minimize overlap loss in 500kHz+ applications.
T_j max	175°C - Allows operation in sealed enclosures or high-ambient industrial environments.

Pinout & Package

STS17NF3LL is housed in a standard SO-8 surface-mount package (JEDEC MS-012AC), with exposed drain pad for enhanced thermal dissipation. Pin 1 is gate, pins 2–4 and 6–8 are source, and pin 5 is drain.

Pin/Terminal	Circuit Role	Design Meaning
1	Gate	Control terminal; requires 4.5–18V drive; threshold voltage 1V ensures reliable turn-on with 3.3V logic.
2,3,4,6,7,8	Source	Common source node; six parallel pins reduce bond-wire inductance and improve current sharing.
5	Drain	Main power output; connected to exposed copper pad for low R_thj-amb (47°C/W on 1in² FR-4).

Key Features

Feature	Design Value
STripFET™ II process	Enables 0.0045Ω R_DS(on) with 26nC Q_g, reducing total power loss in 12V→1.2V buck stages.
Low C_rss (98pF)	Minimizes Miller plateau duration, improving controllability during hard-switching transitions.
Body diode t_rr = 39ns	Reduces reverse recovery loss and EMI in synchronous rectification mode.
ECOPACK® RoHS-compliant	Lead-free second-level interconnect meets JEDEC JESD97; suitable for green manufacturing.

Applications

Telecom Point-of-Load Converter

Server VRM High-Side Switch

Use Scenario: 48V-to-12V intermediate bus conversion in telecom shelf power systems.

IC Role / Device Role / Timing Role: Primary high-side switch in synchronous buck topology operating at 300–500kHz.

Use Value: 0.0055Ω R_DS(on) @ 4.5V enables direct drive from UC1524A controller, eliminating level-shifter complexity.

Use Scenario: 12V input to CPU core voltage (0.8–1.8V) in x86 server VRMs.

IC Role / Device Role / Timing Role: Main switch handling peak currents up to 17A with <150mW conduction loss.

Use Value: Low Q_gd/Q_g ratio (46%) suppresses shoot-through during gate drive skew in multi-phase layouts.

Industrial DC-DC Module

Networking Equipment Power Stage

Use Scenario: Isolated 24V-to-5V flyback secondary-side synchronous rectifier.

IC Role / Device Role / Timing Role: Low-V_DS rectifier replacing Schottky diodes to improve efficiency above 3A load.

Use Value: Body diode forward voltage (V_SD = 1.2V @ 17A) ensures low-loss freewheeling without external diode.

Use Scenario: 48V PoE++ (IEEE 802.3bt) powered device DC-DC stage.

IC Role / Device Role / Timing Role: Input switch managing surge currents during hot-swap insertion.

Use Value: 68A pulsed ID capability and 175°C T_j rating withstand 100ms inrush events per IEEE 802.3bt Class 8.

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel 30V Power MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRF7470PBF	R_DS(on) = 0.0052Ω @ 10V, Q_g = 32nC - higher gate charge increases driver loss.	Designed for lower-frequency (<300kHz) SMPS; less optimized for high-frequency POL.	Prefer when gate drive current is abundant and thermal margin exceeds 20°C.
DMN3028LSD-13	R_DS(on) = 0.0028Ω @ 10V but only rated for 12A continuous - lower current capacity.	Optimized for battery-powered portable devices; lacks telecom-grade SOA robustness.	Select only for space-constrained designs where 12A max current suffices and layout allows tighter thermal management.

Compared with IRF7470PBF and DMN3028LSD-13, STS17NF3LL delivers superior R_DS(on) × Q_g balance at 4.5V drive and wider safe operating area-making it the preferred choice for telecom and server DC-DC where efficiency, frequency, and reliability are co-constrained.

Availability

STS17NF3LL is available at Aetrix Electronics and suitable for telecom point-of-load converters, server VRM high-side switches, industrial DC-DC modules, and networking equipment power stages requiring stable component supply and long-term design-in support.

Supply support for STS17NF3LL 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.

This device belongs to ST's STripFET™ II Power MOSFET product line, engineered specifically for high-frequency, high-efficiency DC-DC conversion in telecom and computing infrastructure where low R_DS(on) and gate charge synergy is critical.

FAQ

Is STS17NF3LL suitable for 3.3V gate drive?

No. While its V_GS(th) is as low as 1V, R_DS(on) rises sharply below 4.5V: at 3.3V, R_DS(on) exceeds 0.012Ω, increasing conduction loss by >150%. It is specified and characterized for 4.5V minimum gate drive per datasheet Table 3.

What is the maximum continuous drain current at 85°C case temperature?

Per datasheet Table 1, I_D derates linearly from 17A at 25°C to 12A at 100°C. At 85°C, interpolation yields ~13.2A continuous current, assuming proper PCB copper area (1in², 2oz Cu) and no forced airflow.

Does STS17NF3LL have avalanche ruggedness rating?

No. The datasheet does not specify single-pulse or repetitive avalanche energy (E_AS). It is not rated for unclamped inductive switching; external clamping or snubbing is required in flyback or boost topologies.

Can STS17NF3LL replace STS17NF30L in existing designs?

No. STS17NF30L is a 300V device with R_DS(on) = 0.22Ω - incompatible voltage rating and on-resistance. STS17NF3LL is strictly a 30V part; substituting it into 300V circuits would cause immediate catastrophic failure.

STS17NF3LL Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: STripFET™ II

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:: 17A (Tc)

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

Rds On (Max) @ Id, Vgs:: 5.5mOhm @ 8.5A, 10V

Vgs(th) (Max) @ Id:: 1V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 35 nC @ 4.5 V

Vgs (Max):: ±18V

Input Capacitance (Ciss) (Max) @ Vds:: 2160 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 3.2W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

STS17NF3LL FAQ

1.How can I place an order for STS17NF3LL through Aetrix?

Please submit a Request for Quotation (RFQ) for STS17NF3LL 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 STS17NF3LL reliable?

The price and inventory of STS17NF3LL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STS17NF3LL is usually 5 days.

3.What payment methods are accepted for STS17NF3LL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STS17NF3LL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STS17NF3LL?

STS17NF3LL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STS17NF3LL 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 STS17NF3LL?

For technical support, including STS17NF3LL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STS17NF3LL requirements.

6.How does Aetrix verify that STS17NF3LL is sourced from the original manufacturer or authorized distributors?

All STS17NF3LL 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 STS17NF3LL meets industry standards.

7.What is the process for return or replacement of STS17NF3LL?

All STS17NF3LL units undergo pre-shipment inspection (PSI). If there is an issue with STS17NF3LL, 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 STS17NF3LL part is unused and in its original packaging.

Return procedure for STS17NF3LL:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…