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

Infineon Technologies IRL3705Z

Name: IRL3705Z
Brand: Infineon Technologies
SKU: IRL3705Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: IRL3705Z

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: IRL3705Z.pdf

Description:: MOSFET N-CH 55V 75A TO220AB

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,677

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

Product details

Overview

IRL3705Z from Infineon Technologies (formerly International Rectifier) is an N-channel logic-level HEXFET® Power MOSFET in TO-220AB package, rated for 55V V_DSS, 8.0 mΩ R_DS(on) at V_GS = 10 V, and 75 A continuous drain current at T_C = 25°C. It features 175°C junction temperature rating, fast switching (t_r = 240 ns, t_f = 83 ns), and tested repetitive avalanche capability up to T_jmax, making it suitable for high-efficiency DC-DC converters and motor drive half-bridges.

For engineers reviewing the IRL3705Z datasheet, IRL3705Z pinout, IRL3705Z application, or IRL3705Z equivalent, key selection criteria include its logic-level gate drive compatibility (V_GS(th) = 1.0–3.0 V), low conduction loss at 5 V gate bias, body diode recovery performance (t_rr = 16–24 ns), and thermal resistance (R_θJC = 1.14 °C/W) for heatsink-limited industrial power stages.

Technical Context

This MOSFET employs advanced planar silicon processing to minimize on-resistance per die area while maintaining robust avalanche ruggedness. Its gate charge profile (Q_g = 40–60 nC, Q_gd = 21 nC) supports efficient hard-switching in synchronous buck topologies operating below 200 kHz.

The integrated body diode exhibits low forward voltage (V_SD = 1.3 V at I_S = 52 A) and controlled reverse recovery (Q_rr = 7.4–11 nC), enabling reliable operation in freewheeling paths without external Schottky supplementation in medium-power SMPS designs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	55 V - Maximum blocking voltage before avalanche onset; sets upper limit for input rail in 48 V systems.
R_DS(on)	8.0 mΩ @ V_GS = 10 V - Conduction loss of 45 W at 75 A; enables <1% resistive loss in 50 A load switches.
I_D (cont)	75 A @ T_C = 25°C - Sustained current capability with adequate heatsinking; derates to 61 A at 100°C case temp.
Q_g	40–60 nC - Gate drive energy requirement determines driver strength needed for <100 ns switching transitions.
t_r/t_f	240 ns / 83 ns - Rise/fall times define minimum practical PWM frequency and EMI filter sizing in buck regulators.
T_jmax	175°C - Enables operation in sealed enclosures or high-ambient environments without forced air cooling.
E_AS	340 mJ (tested) - Single-pulse avalanche energy capacity allows safe inductive turn-off in relay drivers or solenoid controls.

Pinout & Package

IRL3705Z uses a TO-220AB package with isolated tab (drain-connected). The three terminals are arranged in standard single-row configuration: Pin 1 = Gate, Pin 2 = Drain (tab), Pin 3 = Source.

Pin/Terminal	Circuit Role	Design Meaning
Gate (G)	Control electrode	Accepts logic-level (≥4.5 V) or 5 V microcontroller output directly; threshold voltage 1.0–3.0 V ensures turn-on with standard digital I/O.
Drain (D)	High-side current path	Internally connected to metal tab; must be electrically isolated from heatsink unless circuit ground reference permits direct mounting.
Source (S)	Return path & reference node	Serves as local ground reference for gate drive; internal source inductance (L_S = 7.5 nH) affects high-di/dt ringing during turn-off.

Key Features

Feature	Design Value
Logic-level gate drive	Operates fully enhanced at V_GS = 4.5 V (R_DS(on) ≤ 11 mΩ), eliminating need for gate boosters in 5 V MCU-controlled loads.
Ultra-low R_DS(on)	8.0 mΩ at 10 V enables <0.5 W conduction loss at 25 A, reducing thermal design burden in compact power modules.
Repetitive avalanche rated	Tested to withstand repeated unclamped inductive switching events up to T_jmax, supporting robust solenoid/relay driver designs.
175°C junction rating	Permits sustained operation in automotive under-hood or industrial control cabinet environments without derating.
Lead-free construction	Complies with RoHS Directive 2011/65/EU; Pb-free plating on TO-220AB leads ensures solderability with standard reflow profiles.

Applications

DC-DC Buck Converter

Brushed DC Motor Driver

Use Scenario: High-current step-down regulator supplying 12 V/30 A to embedded computing module from 48 V battery bus.

IC Role / Device Role / Timing Role: Low-side synchronous rectifier in continuous conduction mode (CCM) buck stage; switched at 100 kHz with 5 V gate drive.

Use Value: 8.0 mΩ R_DS(on) limits conduction loss to 7.2 W at full load, enabling passive cooling and >94% efficiency at nominal load.

Use Scenario: H-bridge driver for 24 V, 25 A brushed motor in automated gate actuator with stall detection.

IC Role / Device Role / Timing Role: High-side switch in half-bridge leg; subjected to 100 A peak inductive turn-off during direction reversal.

Use Value: 340 mJ tested avalanche energy prevents failure during rapid deceleration-induced back-EMF spikes without snubber networks.

Industrial Power Supply

LED Constant-Current Driver

Use Scenario: Primary-side switch in 500 W AC-DC front-end with active PFC and LLC resonant secondary.

IC Role / Device Role / Timing Role: Boost switch in continuous conduction mode PFC stage; operated at 65 kHz with 12 V gate drive.

Use Value: Fast switching (t_r = 240 ns, t_f = 83 ns) and low Q_gd/Q_g ratio reduce switching losses by 22% vs. legacy MOSFETs at same frequency.

Use Scenario: High-side current regulator for 48 V, 10 A LED string in outdoor signage with dimming via PWM.

IC Role / Device Role / Timing Role: Linear-mode constant-current switch modulated at 1–10 kHz; conducts continuously during ON phase.

Use Value: 175°C T_jmax and 1.14 °C/W R_θJC allow stable 10 A operation with minimal heatsink volume in thermally constrained enclosures.

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
STP75NF75	V_DSS = 75 V, R_DS(on) = 10.5 mΩ @ 10 V, Q_g = 120 nC	Higher voltage rating but higher gate charge and on-resistance; slower switching	Prefer when 75 V blocking is required and gate drive strength exceeds 1 A peak.
IRF1404	V_DSS = 40 V, R_DS(on) = 4.8 mΩ @ 10 V, V_GS(th) = 2.0–4.0 V	Lower voltage rating, lower R_DS(on), but non-logic-level gate; requires ≥10 V drive	Select only if system rail ≤36 V and dedicated 12 V gate supply is available.

Compared with STP75NF75 and IRF1404, IRL3705Z offers optimal balance of logic-level drivability, 55 V rating, and 8.0 mΩ conduction loss-making it preferred for 48 V industrial loads where gate drive simplicity and thermal efficiency are jointly critical.

Availability

IRL3705Z is available at Aetrix Electronics and suitable for DC-DC converters, brushed motor drivers, industrial power supplies, and LED constant-current drivers requiring stable component supply and long-term manufacturing continuity.

Supply support for IRL3705Z 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 AG is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs and discrete devices.

The IRL3705Z belongs to Infineon's HEXFET® logic-level MOSFET product line, engineered for high-current, low-voltage switching applications where gate drive simplicity and thermal robustness are essential-particularly in battery-powered and space-constrained power systems.

FAQ

Is IRL3705Z suitable for 5 V microcontroller direct drive?

Yes. With V_GS(th) spanning 1.0–3.0 V and full enhancement achieved at V_GS = 4.5 V (R_DS(on) ≤ 11 mΩ), the IRL3705Z interfaces directly with 5 V GPIO without level-shifting. Verified test data shows 75 A conduction capability at 5 V gate bias in pulsed conditions, confirming robust logic-level operation.

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

At T_C = 100°C, the continuous drain current is derated to 61 A (per Absolute Maximum Ratings table). This value reflects silicon-limited current handling under thermal equilibrium and assumes proper heatsinking with R_θJC = 1.14 °C/W and ambient interface resistance ≤0.5 °C/W.

Does IRL3705Z have avalanche energy rating for repetitive operation?

Yes. The datasheet specifies "Repetitive Avalanche Allowed up to T_jmax" and provides curves for E_AR (repetitive avalanche energy) in Figure 16. At T_j = 25°C start, E_AR = 120 mJ at 1% duty cycle; this is validated through standardized unclamped inductive switching tests per JEDEC JESD24-11.

Can IRL3705Z replace IRL3713 in an existing PCB layout?

No. Although both are TO-220AB logic-level MOSFETs, IRL3713 has R_DS(on) = 3.0 mΩ and higher Q_g (71 nC), resulting in different gate drive dynamics and thermal dissipation. Layout reuse is not recommended without verifying gate loop inductance, snubber requirements, and thermal margin under identical operating conditions.

IRL3705Z Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: HEXFET®

Package/Case:: TO-220-3

Packaging:: Tube

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):: 4.5V, 10V

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):: ±16V

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

FET Feature:: -

Power Dissipation (Max):: 130W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220AB

IRL3705Z FAQ

1.How can I place an order for IRL3705Z through Aetrix?

Please submit a Request for Quotation (RFQ) for IRL3705Z 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 IRL3705Z reliable?

The price and inventory of IRL3705Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRL3705Z is usually 5 days.

3.What payment methods are accepted for IRL3705Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRL3705Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRL3705Z?

IRL3705Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRL3705Z 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 IRL3705Z?

For technical support, including IRL3705Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRL3705Z requirements.

6.How does Aetrix verify that IRL3705Z is sourced from the original manufacturer or authorized distributors?

All IRL3705Z 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 IRL3705Z meets industry standards.

7.What is the process for return or replacement of IRL3705Z?

All IRL3705Z units undergo pre-shipment inspection (PSI). If there is an issue with IRL3705Z, 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 IRL3705Z part is unused and in its original packaging.

Return procedure for IRL3705Z:

1.Submit a request within 90 days.

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

Tech Hub

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…

2026-07-17 Raspberry Pi Alternatives: Chip-Level Comparison, Compatibility and Replacement Guide

Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…

2026-07-13 How to Test Dynamic Load Response in Low-Voltage High-Current Buck Converters

Engineering guide to dynamic load response testing for high-current buck converters, covering load step setup, slew rate, Vcore undershoot, overshoot, recovery time, probe location, output capacitors a…

2026-07-08 Output Capacitor Selection for High-Current ASIC Vcore Rails

Engineering guide to output capacitor selection for ASIC Vcore rails, covering bulk capacitors, polymer capacitors, MLCC decoupling, DC bias, ESR, ESL, placement, transient response and substitution ri…

2026-07-07 High-Current ASIC Core Power Supply Design: 12-Phase Buck, PMBus and Dynamic Load Response

Engineering guide to high-current ASIC Vcore rails, covering 12-phase buck architecture, PMBus control, dynamic load testing, output capacitor networks, smart power stage selection, thermal design and …

2026-07-06 Voltage Regulator: Types, Circuits, Testing and Selection Guide

Voltage regulator guide covering linear, LDO, 7805, Zener, adjustable, buck, VRM and alternator regulators, with design checks, testing methods, troubleshooting and datasheet-based selection.

2026-06-30 Amplifiers Explained: Types, Circuits, Gain, Classes and Applications

Amplifier guide covering voltage, current and power amplification, gain, feedback, amplifier classes, audio and RF applications, op-amp circuits, transimpedance amplifiers, datasheet selection and trou…