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

Infineon Technologies IRL3705ZSTRL

Name: IRL3705ZSTRL
Brand: Infineon Technologies
SKU: IRL3705ZSTRL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRL3705ZSTRL

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: IRL3705ZSTRL.pdf

Description:: MOSFET N-CH 55V 75A D2PAK

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Product details

Overview

IRL3705ZSTRL from Infineon Technologies is a logic-level N-channel HEXFET® Power MOSFET with V_DSS = 55 V, R_DS(on) = 8.0 mΩ (at V_GS = 10 V), and continuous drain current I_D = 75 A at T_C = 25°C. It features 175°C junction temperature rating, fast switching (t_r = 240 ns, t_f = 83 ns), and rated repetitive avalanche energy up to 180 mJ - deployed in high-efficiency DC-DC converters and motor drive half-bridges.

For engineers reviewing the IRL3705ZSTRL datasheet, IRL3705ZSTRL pinout, IRL3705ZSTRL application, or IRL3705ZSTRL equivalent, key selection criteria include its low gate threshold (V_GS(th) = 1.0–3.0 V), ultra-low on-resistance per silicon area, body diode reverse recovery charge Q_rr = 7.4–11 nC, and D²Pak package thermal resistance R_θJC = 1.14°C/W.

Technical Context

This MOSFET uses advanced planar processing to minimize R_DS(on) while maintaining robust avalanche capability. Its logic-level gate enables direct drive from 3.3 V/5 V microcontrollers without level-shifting circuitry.

The integrated body diode exhibits V_SD = 1.3 V (max) and t_rr = 16–24 ns, supporting synchronous rectification and freewheeling in hard-switched topologies. Thermal design is enabled by validated transient impedance curves (Fig. 11) and linear derating factor of 0.88 W/°C above 25°C case temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	55 V - maximum blocking voltage before avalanche onset; supports 24–48 V bus systems with margin
R_DS(on)	8.0 mΩ @ V_GS = 10 V - enables <1 W conduction loss at 40 A, critical for high-current power stages
I_D (cont)	75 A @ T_C = 25°C - silicon-limited current handling, de-rated to 61 A at 100°C case
Q_g	40–60 nC - determines gate driver power requirement and switching loss trade-off
E_AS	340 mJ (tested) - quantifies unclamped inductive switching survivability in motor control fault events
T_J max	175°C - allows operation in sealed enclosures or high-ambient industrial environments
V_GS(th)	1.0–3.0 V - ensures full enhancement with standard logic-level MCU GPIOs

Pinout & Package

IRL3705ZSTRL is housed in a surface-mount D²Pak (TO-263AB) package with three terminals: Drain (tab), Source (pins 1 & 2), and Gate (pin 3). The exposed drain pad provides low-inductance, high-current path and serves as primary thermal interface to PCB copper.

Pin/Terminal	Circuit Role	Design Meaning
Drain (Tab)	Main current sink terminal	Electrically and thermally connected to PCB copper pour; requires solder mask defined thermal pad
Source (Pins 1 & 2)	Current return path & reference node	Parallel pins reduce source inductance (L_S = 7.5 nH); critical for minimizing shoot-through risk
Gate (Pin 3)	Control input for channel modulation	Low-threshold input compatible with 3.3 V logic; requires <60 nC total charge for full turn-on

Key Features

Feature	Design Value
Logic-level gate drive	Operates fully enhanced at V_GS ≥ 4.5 V - eliminates need for gate driver ICs in low-voltage embedded systems
Ultra-low R_DS(on)	8.0 mΩ enables >96% efficiency in 48 V/50 A buck converters at 100 kHz
Repetitive avalanche rated	Rated for E_AR = 120 mJ at T_J = 175°C - supports reliable operation under inductive load transients
Fast body diode	t_rr = 16–24 ns and Q_rr = 7.4–11 nC - reduces switching losses in synchronous rectifier and H-bridge freewheeling
Lead-free construction	RoHS-compliant materials and termination - meets IPC-J-STD-020 moisture sensitivity level 3 (MSL3)

Applications

Brushless DC Motor Drive

Server VRM Phase Leg

Use Scenario: Half-bridge switching stage in 24–48 V BLDC inverters for HVAC blowers and industrial fans.

IC Role / Device Role / Timing Role: High-side and low-side power switch; handles 75 A peak phase current with <100 ns dead-time tolerance.

Use Value: Low R_DS(on) and fast t_f = 83 ns minimize conduction + switching losses, enabling >97% inverter efficiency at 20 kHz PWM.

Use Scenario: Lower-side switch in multiphase buck converter supplying CPU core voltage (0.8–1.2 V @ 100+ A).

IC Role / Device Role / Timing Role: Synchronous rectifier; conducts during high-side off-time with minimal V_SD drop.

Use Value: Body diode V_SD = 1.3 V and Q_rr = 7.4 nC reduce reverse recovery loss, improving light-load efficiency by ~1.2% vs. higher-Q_rr alternatives.

Industrial DC-DC Converter

Automotive Auxiliary Power Supply

Use Scenario: Primary switch in isolated 48 V-to-12 V flyback or forward converter for factory automation PLCs.

IC Role / Device Role / Timing Role: Main power switch; withstands 55 V input with 150% overvoltage margin and handles 100% duty cycle during startup.

Use Value: 175°C T_J rating and R_θJC = 1.14°C/W allow stable operation in sealed metal enclosures without forced air cooling.

Use Scenario: Load switch in 12 V auxiliary supply for ADAS camera modules and infotainment USB ports.

IC Role / Device Role / Timing Role: Reverse polarity and surge protection switch; placed upstream of LDOs or DC-DC regulators.

Use Value: Rated repetitive avalanche energy (E_AR = 120 mJ) protects against load dump transients per ISO 7637-2 Pulse 5a without external TVS.

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
IRF3708PbF	R_DS(on) = 12 mΩ (higher), Q_g = 32 nC (lower), TO-220AB package	Larger footprint, higher thermal resistance (R_θJC = 1.3°C/W), lower current density	Prefer when board space permits through-hole mounting and gate drive power is constrained
STP75NF75	V_DSS = 75 V (higher), R_DS(on) = 10.5 mΩ, D²Pak package	Higher voltage margin but 31% higher conduction loss at 50 A; slower t_f = 120 ns	Choose only if system requires >60 V blocking; otherwise inferior efficiency in 48 V systems

Compared with IRL3705ZSTRL, IRF3708PbF trades conduction loss for gate drive simplicity and mechanical robustness, while STP75NF75 sacrifices efficiency for voltage headroom - making IRL3705ZSTRL optimal for space-constrained, high-current 48 V industrial power stages.

Availability

IRL3705ZSTRL is available at Aetrix Electronics and suitable for brushless DC motor drives, server VRM phase legs, and industrial DC-DC converters requiring stable component supply and long-term production continuity.

Supply support for IRL3705ZSTRL 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive electronics, and industrial control ICs, with global manufacturing and quality certification to IATF 16949 and ISO 9001.

The IRL3705Z series belongs to Infineon's logic-level HEXFET® Power MOSFET product line, engineered for high-efficiency, high-current switching in space-constrained embedded power supplies and motor controllers.

FAQ

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

The IRL3705ZSTRL supports 61 A continuous drain current at T_C = 100°C, as specified in the Absolute Maximum Ratings table. This derating reflects thermal limits of the D²Pak package and silicon, not gate drive capability - gate remains fully enhanced down to V_GS = 4.5 V across the full temperature range.

Does this MOSFET require a gate resistor for stability in high-frequency switching?

Yes - a gate resistor (typically 4.3 Ω, per test conditions in datasheet Fig. 18a) is required to dampen ringing caused by gate loop inductance and device capacitance. Without it, overshoot exceeding ±16 V absolute maximum V_GS rating may occur, risking gate oxide damage during 100+ kHz PWM operation.

Can the body diode be used for synchronous rectification in a buck converter?

Yes - the integral body diode has t_rr = 16–24 ns and Q_rr = 7.4–11 nC, enabling efficient synchronous rectification at ≤200 kHz. However, external Schottky diodes remain preferable above 300 kHz due to lower Q_rr and zero reverse recovery loss.

Is the D²Pak package lead-free and RoHS compliant?

Yes - IRL3705ZSTRL is manufactured with lead-free terminations and complies with RoHS Directive 2011/65/EU. The "Z" suffix denotes lead-free construction, and the device meets JEDEC J-STD-020 MSL3 requirements for reflow soldering with peak temperature up to 260°C.

IRL3705ZSTRL Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Packaging:: Cut Tape (CT)

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 55 V

Current - Continuous Drain (Id) @ 25°C:: 75A (Tc)

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

Rds On (Max) @ Id, Vgs:: 8mOhm @ 52A, 10V

Vgs(th) (Max) @ Id:: 3V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 60 nC @ 5 V

Vgs (Max):: -

Input Capacitance (Ciss) (Max) @ Vds:: 2880 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK

IRL3705ZSTRL FAQ

1.How can I place an order for IRL3705ZSTRL through Aetrix?

Please submit a Request for Quotation (RFQ) for IRL3705ZSTRL 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 IRL3705ZSTRL reliable?

The price and inventory of IRL3705ZSTRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRL3705ZSTRL is usually 5 days.

3.What payment methods are accepted for IRL3705ZSTRL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRL3705ZSTRL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRL3705ZSTRL?

IRL3705ZSTRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRL3705ZSTRL 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 IRL3705ZSTRL?

For technical support, including IRL3705ZSTRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRL3705ZSTRL requirements.

6.How does Aetrix verify that IRL3705ZSTRL is sourced from the original manufacturer or authorized distributors?

All IRL3705ZSTRL 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 IRL3705ZSTRL meets industry standards.

7.What is the process for return or replacement of IRL3705ZSTRL?

All IRL3705ZSTRL units undergo pre-shipment inspection (PSI). If there is an issue with IRL3705ZSTRL, 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 IRL3705ZSTRL part is unused and in its original packaging.

Return procedure for IRL3705ZSTRL:

1.Submit a request within 90 days.

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

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