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 STL170N4LF8

Name: STL170N4LF8
Brand: STMicroelectronics
SKU: STL170N4LF8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: STL170N4LF8

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: -

Datasheet:: STL170N4LF8.pdf

Description:: POWER FLAT 8L 6X5X1 P1.27

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:7,202

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

Product details

Overview

STL170N4LF8 from STMicroelectronics is a 40 V N-channel logic-level Power MOSFET in PowerFLAT 5x6 package, featuring 2.2 mΩ max. R_DS(on) at V_GS = 10 V, 167 A continuous drain current at T_C = 25 °C, and 175 °C maximum junction temperature. It delivers ultra-low conduction loss and fast switching for high-efficiency motor drives and industrial DC-DC converters.

For engineers reviewing the STL170N4LF8 datasheet, STL170N4LF8 pinout, STL170N4LF8 application, or STL170N4LF8 equivalent, this page provides verified electrical parameters, thermal performance data, gate charge characteristics, avalanche ruggedness metrics, and real-world use context for power stage design validation.

Technical Context

This MOSFET employs ST's STripFET F8 trench-gate technology to minimize R_DS(on) while reducing C_iss (2600 pF), C_oss (680 pF), and total gate charge Q_g (34.5 nC at 10 V). Its enhanced structure supports high-current synchronous rectification and hard-switched topologies with low switching losses.

The device integrates a robust body diode with 39 ns reverse recovery time and 33 nC Q_rr, enabling reliable operation in freewheeling paths. MSL1 rating and 100% avalanche testing ensure reliability under transient overvoltage conditions in industrial motor control and power supply designs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V - Maximum blocking voltage for 12–24 V input systems with margin against transients.
R_DS(on) max.	2.2 mΩ at V_GS = 10 V - Enables ≤0.7 W conduction loss at 60 A, critical for thermally constrained PCB layouts.
I_D continuous	167 A at T_C = 25 °C - Supports high-current half-bridge legs without parallel devices in compact motor inverters.
Q_g	34.5 nC at V_GS = 0–10 V - Reduces gate driver power demand and enables >100 kHz PWM operation with low drive loss.
T_J max.	175 °C - Allows sustained operation in sealed enclosures or high-ambient environments like industrial tools.
E_AS	153 mJ at T_J = 25 °C - Withstands single-pulse inductive energy spikes in motor phase-legs without failure.
R_thJC	1.35 °C/W - Enables direct heatsinking to copper planes or external thermal pads for efficient power dissipation.

Pinout & Package

STL170N4LF8 uses the PowerFLAT 5x6 type B surface-mount package (JEDEC MO-229WEED), optimized for high-current PCB thermal management with exposed drain pad and low-profile footprint (5.0 × 6.0 mm, height ≤ 1.0 mm).

Pin/Terminal	Circuit Role	Design Meaning
D (Pins 5, 6, 7, 8)	Drain terminal (common source connection point)	Exposed copper pad on bottom - primary thermal path and high-current return node; must be soldered to large copper pour.
G (Pin 4)	Gate input	Control terminal requiring <10 V logic-level drive; low Q_g enables fast turn-on with minimal Miller effect.
S (Pins 1, 2, 3)	Source terminal	Low-inductance source connection; pins 1–3 are internally bonded to source metallization for reduced loop inductance in switching nodes.

Key Features

Feature	Design Value
STripFET F8 trench architecture	Reduces R_DS(on) × Q_g FoM by 35% vs prior generation - improves efficiency in 50–200 kHz SMPS and BLDC drivers.
100% avalanche tested	Guarantees single-pulse ruggedness up to 153 mJ - eliminates need for external snubbers in inductive load switching.
MSL1 moisture sensitivity level	Zero bake requirement before reflow - simplifies SMT assembly and avoids thermal stress on die attach.
Logic-level gate threshold	V_GS(th) = 1.2–2.0 V - fully compatible with 3.3 V and 5 V microcontroller GPIOs without level-shifting circuitry.
Enhanced body diode	39 ns t_rr, 33 nC Q_rr - minimizes reverse recovery loss during synchronous rectification in buck and half-bridge topologies.

Applications

Industrial Motor Drives

High-Efficiency DC-DC Converters

Use Scenario: High-power brushless DC motor inverter stages for cordless power tools and HVAC blowers.

IC Role / Device Role / Timing Role: Low-side switch in three-phase half-bridge configuration, handling peak currents ≥120 A per phase.

Use Value: 2.2 mΩ R_DS(on) reduces I²R loss by 40% vs 3.5 mΩ alternatives, enabling 10 °C lower MOSFET case temperature at full load.

Use Scenario: Primary-side synchronous rectifier in 48 V–12 V isolated buck converter for server power supplies.

IC Role / Device Role / Timing Role: Secondary-side power switch operating at 200 kHz with zero-voltage switching (ZVS) assist.

Use Value: 34.5 nC Q_g and 18 pF Crss enable clean turn-off with minimal shoot-through risk, improving conversion efficiency by 0.8% at 50 A output.

Industrial Power Supplies

Motor Control Reference Designs

Use Scenario: Output stage switch in 1 kW telecom rectifier with active OR-ing and hot-swap capability.

IC Role / Device Role / Timing Role: High-current load switch with integrated current sensing via Kelvin source pins (S1–S3).

Use Value: MSL1 rating and 175 °C T_J allow uninterrupted operation in forced-air-cooled 1U chassis with ambient up to 70 °C.

Use Scenario: Evaluation board component in ST's STEVAL-IPFC01V1 PFC + inverter reference design for industrial pumps.

IC Role / Device Role / Timing Role: Verified drop-in replacement for previous-generation 40 V MOSFETs in gate-driver + layout-optimized half-bridge modules.

Use Value: Identical PowerFLAT 5x6 footprint and pinout enables direct PCB reuse, cutting design cycle time by 3 weeks.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Infineon IPP026N04L	R_DS(on) = 2.6 mΩ (higher), Q_g = 38 nC (higher), same PowerSO-8 package	Lower current density requires larger PCB area for equivalent thermal performance	Prefer when legacy PowerSO-8 footprint compatibility is mandatory and 0.4 mΩ R_DS(on) penalty is acceptable.
Vishay SiR626DP	R_DS(on) = 2.3 mΩ, Q_g = 32 nC, but only rated to 150 °C T_J and not avalanche-tested	Limited thermal headroom in sealed enclosures; no guaranteed avalanche energy rating	Select only for cost-sensitive consumer-grade applications where 175 °C operation and ruggedness are non-critical.

Compared with IPP026N04L and SiR626DP, STL170N4LF8 offers the lowest R_DS(on) × Q_g product and unique 175 °C/100% avalanche qualification - making it optimal for high-reliability industrial motor drives where thermal margin and transient immunity are design-critical.

Availability

STL170N4LF8 is available at Aetrix Electronics and suitable for industrial motor drives, high-efficiency DC-DC converters, and industrial power supplies requiring stable component supply across multi-year production cycles.

Supply support for STL170N4LF8 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, specializing in power management, microcontrollers, sensors, and automotive ICs.

This device belongs to ST's STripFET F8 Power MOSFET product line, engineered specifically for high-current, high-frequency industrial switching applications demanding low R_DS(on), fast switching, and rugged avalanche performance.

FAQ

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

The STL170N4LF8 supports 118 A continuous drain current at T_C = 100 °C, as specified in Table 1 of DS14199 Rev 2. This derating reflects thermal limits of the PowerFLAT 5x6 package and ensures safe operation within SOA boundaries at elevated temperatures.

Does this MOSFET require a gate resistor for stability in hard-switched applications?

Yes - a 4.7 Ω gate resistor is used in the datasheet's switching time characterization (Table 5), confirming its role in controlling dV/dt and preventing oscillation. For 200 kHz+ operation, a 2.2–4.7 Ω non-inductive resistor is recommended to balance switching speed and EMI.

Can STL170N4LF8 replace older STripFET F7 devices in existing designs?

Yes - identical PowerFLAT 5x6 footprint, pinout, and logic-level gate drive make it a direct drop-in upgrade. Measured R_DS(on) improvement from ~2.5 mΩ (F7) to 2.2 mΩ (F8) yields measurable thermal and efficiency gains without layout changes.

Is the body diode suitable for synchronous rectification in a buck converter?

Yes - with 39 ns reverse recovery time and 33 nC Q_rr, the intrinsic diode supports synchronous rectification up to 200 kHz. Its low V_SD (1.1 V at 60 A) also reduces forward conduction loss compared to discrete Schottky solutions.

STL170N4LF8 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: -

Technology:: -

Drain to Source Voltage (Vdss):: -

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

Drive Voltage (Max Rds On, Min Rds On):: -

Rds On (Max) @ Id, Vgs:: -

Vgs(th) (Max) @ Id:: -

Gate Charge (Qg) (Max) @ Vgs:: -

Vgs (Max):: -

Input Capacitance (Ciss) (Max) @ Vds:: -

FET Feature:: -

Power Dissipation (Max):: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

STL170N4LF8 FAQ

1.How can I place an order for STL170N4LF8 through Aetrix?

Please submit a Request for Quotation (RFQ) for STL170N4LF8 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 STL170N4LF8 reliable?

The price and inventory of STL170N4LF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STL170N4LF8 is usually 5 days.

3.What payment methods are accepted for STL170N4LF8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STL170N4LF8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STL170N4LF8?

STL170N4LF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STL170N4LF8 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 STL170N4LF8?

For technical support, including STL170N4LF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STL170N4LF8 requirements.

6.How does Aetrix verify that STL170N4LF8 is sourced from the original manufacturer or authorized distributors?

All STL170N4LF8 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 STL170N4LF8 meets industry standards.

7.What is the process for return or replacement of STL170N4LF8?

All STL170N4LF8 units undergo pre-shipment inspection (PSI). If there is an issue with STL170N4LF8, 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 STL170N4LF8 part is unused and in its original packaging.

Return procedure for STL170N4LF8:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-11 Comparator Circuit: Voltage Thresholds, Op-Amp Differences, LM393 and Practical Design

Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.

2026-09-10 Schmitt Trigger Explained: Hysteresis, Circuits, Inverters and Applications

Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

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 …