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 IRL3705ZLPBF

Name: IRL3705ZLPBF
Brand: Infineon Technologies
SKU: IRL3705ZLPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: IRL3705ZLPBF

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

Package:: TO-262-3 Long Leads, I2PAK, TO-262AA

Datasheet:: IRL3705ZLPBF.pdf

Description:: MOSFET N-CH 55V 75A TO262

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,052

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

Product details

Overview

IRL3705ZLPBF from Infineon Technologies is a logic-level N-channel HEXFET® Power MOSFET in TO-262 (I²PAK) package, rated for 55V V_DSS, 8.0 mΩ R_DS(on) at V_GS = 4.5V, and 75A continuous drain current at T_C = 25°C. It serves as a high-efficiency main or synchronous rectifier switch in DC-DC converters, motor drives, and power supplies.

For engineers reviewing the IRL3705ZLPBF datasheet, IRL3705ZLPBF pinout, IRL3705ZLPBF application, or IRL3705ZLPBF equivalent, key selection criteria include its 4.5V logic-level gate drive compatibility, 175°C junction temperature rating, fast switching (t_r = 240 ns), repetitive avalanche capability (E_AS = 340 mJ), and low thermal resistance (R_θJC = 1.14 °C/W).

Technical Context

This MOSFET employs advanced silicon processing to minimize on-resistance per die area while maintaining robust unclamped inductive switching performance. Its gate threshold voltage (1.0–3.0 V) enables direct interfacing with 3.3V/5V microcontrollers without level-shifting circuitry.

The device integrates a fast, low-loss body diode (t_rr = 16–24 ns, Q_rr = 7.4–11 nC) and supports high di/dt operation (100 A/µs) in hard-switched topologies. Thermal design is facilitated by its low R_θJC and validated safe operating area up to 175°C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	55 V - Maximum blocking voltage in off-state; suitable for 48V bus and automotive 36V systems
R_DS(on) @ V_GS = 4.5V	8.0 mΩ max - Enables <1W conduction loss at 35A, critical for high-current 5V-gate applications
I_D @ T_C = 25°C	75 A - Continuous silicon-limited current; requires heatsinking above ~25°C case temperature
Q_g	40–60 nC - Gate charge determines driver strength requirement; compatible with standard 1A peak gate drivers
t_r/t_f	240 ns / 83 ns - Fast edge rates reduce switching losses in 100–500 kHz SMPS designs
E_AS	340 mJ - Single-pulse avalanche energy rating validates ruggedness in inductive load switching
T_J max	175°C - Enables operation in sealed enclosures or high-ambient industrial environments

Pinout & Package

IRL3705ZLPBF uses the TO-262 (I²PAK) package: 3-pin, single-ended, isolated tab (drain-connected), through-hole mountable with M3 screw torque specification of 1.1 N·m.

Pin/Terminal	Circuit Role	Design Meaning
Drain (Tab)	Main current path output / heat sink interface	Electrically connected to metal tab; must be electrically isolated from chassis unless system ground reference permits
Source	Return path for load current / reference node for gate drive	Low-inductance source connection essential for stable switching; internal L_S = 7.5 nH impacts gate loop stability
Gate	Control terminal for channel conduction	Logic-level compatible (V_GS(th) ≤ 3.0 V); requires <60 nC total charge for full enhancement

Key Features

Feature	Design Value
Logic-level gate drive	Operates fully enhanced at V_GS = 4.5V, eliminating need for gate boosters in 5V MCU-controlled systems
Ultra-low R_DS(on)	8.0 mΩ at 4.5V enables >96% efficiency in 48V/30A buck converters at 200 kHz
Repetitive avalanche rated	Validated for repeated unclamped inductive switching up to T_J = 175°C per AN-1005
Lead-free and RoHS compliant	Meets JEDEC J-STD-020 reflow profile; Pb-free plating supports automated assembly and environmental compliance
Fast body diode	t_rr = 16–24 ns and Q_rr = 7.4–11 nC reduce shoot-through risk and EMI in synchronous rectification

Applications

DC-DC Buck Converter

Brushed DC Motor Drive

Use Scenario: High-current step-down regulator for FPGA core voltage (1.2V/40A) powered from 12V rail.

IC Role / Device Role: Synchronous high-side switch with integrated low-R_DS(on) body diode used as low-side freewheeling element.

Use Value: 8.0 mΩ R_DS(on) reduces conduction loss by 42% vs. comparable 12 mΩ MOSFET, lowering thermal load on 2-layer PCB.

Use Scenario: H-bridge driver for 24V, 30A industrial actuator with bidirectional control and regenerative braking.

IC Role / Device Role: Low-side switch enabling PWM-controlled torque and body-diode-assisted energy recirculation during decay phase.

Use Value: 175°C T_J rating sustains 100% duty cycle under stall conditions; fast t_rr minimizes voltage spikes during current reversal.

Automotive Body Control Module

Server PSU OR-ing Circuit

Use Scenario: Load switch for 12V accessory circuits (e.g., HVAC blower, seat heaters) with overcurrent and thermal protection.

IC Role / Device Role: Logic-level controlled high-side switch with built-in avalanche ruggedness for inductive load transients.

Use Value: 340 mJ E_AS withstands ISO 7637-2 pulse 5a without external clamping, reducing BOM count and board space.

Use Scenario: Hot-swap OR-ing FET in redundant 48V server power supply, paralleling two 1.5 kW units.

IC Role / Device Role: Low-V_DS(on) pass transistor minimizing forward drop and power dissipation during normal operation.

Use Value: 8.0 mΩ R_DS(on) limits conduction loss to <1.8W at 48A, enabling natural convection cooling instead of forced air.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRF3705ZPBF	TO-220AB package; identical electrical specs but higher R_θJA (62 °C/W vs. 40–55 °C/W for IRL3705ZLPBF PCB mount)	Better suited for discrete heatsink mounting; less optimal for compact PCB-integrated thermal management	Select when mechanical mounting constraints favor TO-220 and heatsink interface is guaranteed
STP75NF75	75V V_DSS, 10 mΩ R_DS(on) @ 10V; gate threshold 2.0–4.0 V; not logic-level optimized at 4.5V	Requires ≥10V gate drive for full R_DS(on); unsuitable for 3.3V/5V-only control without level shift	Select only if system supports 10V gate drive and higher voltage margin is required

Compared with IRF3705ZPBF and STP75NF75, IRL3705ZLPBF offers superior thermal performance in PCB-mounted configurations and guaranteed 4.5V turn-on-critical for embedded MCU-driven power stages where gate drive voltage headroom is constrained.

Availability

IRL3705ZLPBF is available at Aetrix Electronics and suitable for DC-DC converters, brushed motor drives, automotive body control modules, and server OR-ing circuits requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for IRL3705ZLPBF 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, and industrial control ICs and discrete devices.

This part belongs to Infineon's HEXFET® Power MOSFET product line, engineered for high-efficiency, high-reliability switching in demanding power conversion and motor control applications.

FAQ

Is IRL3705ZLPBF pin-compatible with IRL3705ZSPbF?

Yes-both share identical TO-262 (I²PAK) footprint and pinout (Drain-Tab, Source, Gate). The "L" suffix denotes lead-free TO-262 packaging, while "S" indicates surface-mount variant; however, IRL3705ZSPbF is obsolete and no longer manufactured. IRL3705ZLPBF is the active through-hole version with identical electrical and thermal characteristics.

What is the maximum recommended gate resistor for 200 kHz switching?

A 4.3 Ω gate resistor is specified in the datasheet for 200 kHz operation with V_GS = 5.0 V, V_DD = 28 V, and I_D = 43 A. This value balances switching speed (t_r = 240 ns) against gate driver stress and EMI. For higher-frequency operation (>300 kHz), a lower value (2.2–3.3 Ω) may be used if driver peak current rating allows.

Does the body diode support synchronous rectification?

Yes-the integral body diode has t_rr = 16–24 ns and Q_rr = 7.4–11 nC, making it suitable for synchronous rectification in buck converters up to 500 kHz. However, external Schottky diodes or dedicated synchronous rectifier controllers are preferred for highest efficiency above 300 kHz due to lower Q_rr and forward voltage.

Can IRL3705ZLPBF replace IRFZ44N in existing designs?

Yes-with caveats: both are N-channel TO-220 MOSFETs, but IRL3705ZLPBF (TO-262) has lower R_DS(on) (8.0 mΩ vs. 28 mΩ), higher I_D (75A vs. 49A), and logic-level gate drive. Mechanical replacement requires footprint adaptation; electrical upgrade improves efficiency and thermal margin, especially in 5V-gated systems.

IRL3705ZLPBF Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: HEXFET®

Package/Case:: TO-262-3 Long Leads, I2PAK, TO-262AA

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-262

IRL3705ZLPBF FAQ

1.How can I place an order for IRL3705ZLPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IRL3705ZLPBF 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 IRL3705ZLPBF reliable?

The price and inventory of IRL3705ZLPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRL3705ZLPBF is usually 5 days.

3.What payment methods are accepted for IRL3705ZLPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRL3705ZLPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRL3705ZLPBF?

IRL3705ZLPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRL3705ZLPBF 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 IRL3705ZLPBF?

For technical support, including IRL3705ZLPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRL3705ZLPBF requirements.

6.How does Aetrix verify that IRL3705ZLPBF is sourced from the original manufacturer or authorized distributors?

All IRL3705ZLPBF 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 IRL3705ZLPBF meets industry standards.

7.What is the process for return or replacement of IRL3705ZLPBF?

All IRL3705ZLPBF units undergo pre-shipment inspection (PSI). If there is an issue with IRL3705ZLPBF, 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 IRL3705ZLPBF part is unused and in its original packaging.

Return procedure for IRL3705ZLPBF:

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…