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 IRL3705NPBF

Name: IRL3705NPBF
Brand: Infineon Technologies
SKU: IRL3705NPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: IRL3705NPBF

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: IRL3705NPBF.pdf

Description:: MOSFET N-CH 55V 89A TO220AB

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:6,830

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

Product details

Overview

IRL3705NPBF from Infineon Technologies is a logic-level N-channel enhancement-mode Power MOSFET in TO-220AB package, rated for 55 V V_DS, 89 A continuous drain current at T_C = 25°C, and 10 mΩ R_DS(on) at V_GS = 10 V. It serves as a high-efficiency main switch in DC-DC converters, motor drives, and power supply synchronous rectifiers.

For engineers reviewing the IRL3705NPBF datasheet, IRL3705NPBF pinout, IRL3705NPBF application, or IRL3705NPBF equivalent, key selection criteria include its logic-level gate drive compatibility (V_GS(th) = 1.0–2.0 V), low R_DS(on) at 4.0–5.0 V gate voltage, avalanche ruggedness (E_AS = 340 mJ), and thermal performance (R_θJC = 0.90 °C/W).

Technical Context

This HEXFET® device uses fifth-generation silicon processing to achieve ultra-low on-resistance per die area while maintaining fast switching (t_r = 140 ns, t_f = 78 ns) and robust unclamped inductive switching capability. Its body diode exhibits t_rr = 94–140 ns and Q_rr = 290–440 nC under defined conditions.

The MOSFET features fully rated avalanche energy (E_AS = 340 mJ), dynamic dv/dt immunity (5.0 V/ns), and operation up to T_J = +175°C. Gate charge parameters-Q_g = 98 nC, Q_gd = 49 nC-are optimized for efficient hard-switching in 20–100 kHz power stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	55 V - Maximum blocking voltage in high-side or low-side switch configurations
R_DS(on) @ V_GS = 10 V	10 mΩ - Enables <1 W conduction loss at 10 A, critical for high-current DC-DC output stages
R_DS(on) @ V_GS = 4.0 V	18 mΩ - Supports direct microcontroller GPIO drive without level-shifting circuitry
I_D (continuous, T_C = 25°C)	89 A - Sustains full-load current in industrial motor controllers with heatsink
E_AS	340 mJ - Withstands single-pulse inductive energy during fault events without failure
R_θJC	0.90 °C/W - Allows precise junction temperature estimation using case thermistor placement
Q_g	98 nC - Determines gate driver peak current requirement (~1 A @ 100 ns rise time)

Pinout & Package

IRL3705NPBF is housed in a through-hole TO-220AB package with isolated tab (drain-connected). The package provides low thermal resistance to heatsink (R_θCS = 0.50 °C/W with greased surface) and mechanical mounting via M3 screw (1.1 N·m torque).

Pin/Terminal	Circuit Role	Design Meaning
G (Gate)	Control electrode	Accepts logic-level input (1.0–2.0 V threshold); requires <100 nA leakage handling in high-impedance bias networks
D (Drain)	Main current sink / high-voltage node	Internally connected to metal tab; must be electrically isolated from heatsink unless system ground reference permits
S (Source)	Main current source / reference node	Serves as local power ground return; internal source inductance (L_S = 7.5 nH) impacts high-di/dt ringing

Key Features

Feature	Design Value
Logic-level gate drive	Operates fully enhanced at V_GS ≥ 4.0 V, enabling direct interface with 3.3 V/5 V MCUs and PWM controllers
Fully avalanche-rated	Guaranteed single-pulse E_AS = 340 mJ supports reliable operation in inductive load switching without external snubbers
Dynamic dv/dt rating	Rated for 5.0 V/ns transient immunity, reducing risk of false turn-on in high-noise motor drive environments
High-temperature operation	Rated for continuous operation up to T_J = +175°C, supporting sealed or high-ambient industrial enclosures
Low gate charge	Q_g = 98 nC minimizes driver power loss and enables >100 kHz switching in resonant topologies

Applications

Motor Drive Half-Bridge

DC-DC Synchronous Rectifier

Use Scenario: 24 V BLDC motor control in HVAC blowers with PWM frequency ≤ 20 kHz.

IC Role / Device Role / Timing Role: Low-side switch in half-bridge configuration; conducts during PWM low period with minimal conduction loss.

Use Value: 10 mΩ R_DS(on) limits I²R loss to <0.9 W at 30 A, reducing heatsink size by 40% vs. 20 mΩ alternatives.

Use Scenario: Secondary-side synchronous rectification in 48 V input telecom DC-DC modules.

IC Role / Device Role / Timing Role: Active rectifier replacing Schottky diode; driven complementary to primary-side switch.

Use Value: Body diode V_SD = 1.3 V and Q_rr = 290 nC enable faster recovery than 45 V Schottky, cutting reverse recovery loss by ~35%.

Industrial Power Supply Switch

Overcurrent Protection Switch

Use Scenario: Main 55 V input switch in programmable lab power supplies with soft-start and foldback protection.

IC Role / Device Role / Timing Role: High-side switch controlling bulk input; subjected to repetitive 100 µs overloads.

Use Value: Avalanche energy rating (E_AS = 340 mJ) ensures survival during 500 ms short-circuit events without derating.

Use Scenario: Electronic fuse in battery management systems protecting 48 V Li-ion strings against >100 A faults.

IC Role / Device Role / Timing Role: Current-sense enabled load switch; turned off within 1 µs of overcurrent detection.

Use Value: Fast turn-off delay (t_d(off) = 37 ns) and low Q_gd (49 nC) minimize fault energy dissipation during interruption.

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
IRF3205PBF	R_DS(on) = 8.0 mΩ @ V_GS = 10 V but V_GS(th) = 2.0–4.0 V; not logic-level compatible at 3.3 V	Requires gate driver for 3.3 V MCU interfaces; higher conduction loss at 4.0 V gate	Select when gate drive voltage ≥ 5 V and lower R_DS(on) outweighs logic-level need
STP55NF06L	R_DS(on) = 12 mΩ @ V_GS = 5 V; Q_g = 85 nC; E_AS = 280 mJ	Lower avalanche energy and slightly higher on-resistance reduce margin in fault-prone motor drives	Select when cost sensitivity dominates and fault energy is limited to <250 mJ

Compared with IRF3205PBF and STP55NF06L, IRL3705NPBF uniquely delivers logic-level operation down to 4.0 V gate voltage with industry-leading 340 mJ avalanche rating-critical for unregulated inductive loads where gate drive headroom and fault robustness are non-negotiable.

Availability

IRL3705NPBF is available at Aetrix Electronics and suitable for industrial motor drives, telecom DC-DC converters, and programmable power supplies requiring stable component supply across multi-year production cycles.

Supply support for IRL3705NPBF 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.

The IRL3705NPBF belongs to Infineon's HEXFET® Power MOSFET product line, engineered for high-current, high-reliability switching in commercial and industrial power conversion systems where thermal efficiency and ruggedness are paramount.

FAQ

Is IRL3705NPBF suitable for surface-mount assembly?

No. The TO-220AB package is explicitly not recommended for surface-mount applications per Infineon's package outline documentation. It requires through-hole mounting with mechanical screw attachment to a heatsink for thermal and mechanical reliability.

What is the maximum recommended gate resistor for 100 kHz switching?

Based on Q_g = 98 nC and typical driver capability, a 10 Ω gate resistor supports ~100 ns rise/fall times. For 100 kHz hard-switching, use R_G ≤ 15 Ω to maintain t_r/t_f < 200 ns and limit switching loss to <15% of total loss at 46 A.

Does the body diode support continuous bidirectional current in H-bridge configurations?

Yes-the integral body diode is rated for continuous source current I_S = 89 A at T_C = 25°C and pulsed I_SM = 310 A. However, reverse recovery charge Q_rr = 290–440 nC must be managed with dead-time control to avoid shoot-through in H-bridge freewheeling paths.

How does R_DS(on) change with temperature?

R_DS(on) increases linearly with junction temperature: normalized resistance reaches 2.0× at T_J = 175°C (per Fig. 4). At 100°C, R_DS(on) ≈ 13.5 mΩ-designers must verify thermal design ensures T_J stays below 130°C for <15 mΩ operation at full current.

IRL3705NPBF Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: HEXFET®

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 55 V

Current - Continuous Drain (Id) @ 25°C:: 89A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 4V, 10V

Rds On (Max) @ Id, Vgs:: 10mOhm @ 46A, 10V

Vgs(th) (Max) @ Id:: 2V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 98 nC @ 5 V

Vgs (Max):: ±16V

Input Capacitance (Ciss) (Max) @ Vds:: 3600 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 170W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220AB

IRL3705NPBF FAQ

1.How can I place an order for IRL3705NPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IRL3705NPBF 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 IRL3705NPBF reliable?

The price and inventory of IRL3705NPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRL3705NPBF is usually 5 days.

3.What payment methods are accepted for IRL3705NPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRL3705NPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRL3705NPBF?

IRL3705NPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRL3705NPBF 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 IRL3705NPBF?

For technical support, including IRL3705NPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRL3705NPBF requirements.

6.How does Aetrix verify that IRL3705NPBF is sourced from the original manufacturer or authorized distributors?

All IRL3705NPBF 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 IRL3705NPBF meets industry standards.

7.What is the process for return or replacement of IRL3705NPBF?

All IRL3705NPBF units undergo pre-shipment inspection (PSI). If there is an issue with IRL3705NPBF, 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 IRL3705NPBF part is unused and in its original packaging.

Return procedure for IRL3705NPBF:

1.Submit a request within 90 days.

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

Tech Hub

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

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.