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

Infineon Technologies IRL3705NSPBF

Name: IRL3705NSPBF
Brand: Infineon Technologies
SKU: IRL3705NSPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRL3705NSPBF

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

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

Datasheet:: IRL3705NSPBF.pdf

Description:: MOSFET N-CH 55V 89A D2PAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

IRL3705NSPBF from Infineon Technologies is a 55 V, 110 A, 8.0 mΩ N-channel HEXFET Power MOSFET in TO-262 (D-Pak) package, optimized for high-current DC-DC conversion and motor drive switching at 10 V gate drive. It delivers low conduction loss with R_DS(on) ≤ 8.0 mΩ at V_GS = 10 V and T_J = 25°C, supports continuous I_D up to 110 A, and features integrated body diode with 19 A reverse recovery current rating.

For engineers reviewing the IRL3705NSPBF datasheet, IRL3705NSPBF pinout, IRL3705NSPBF application, or IRL3705NSPBF equivalent, key selection criteria include its 8.0 mΩ on-resistance at 10 V gate drive, 110 A continuous drain current capability, TO-262 thermal performance (R_θJC = 0.45°C/W), avalanche energy rating of 200 mJ, and suitability for synchronous rectification in 12 V/24 V industrial power supplies.

Technical Context

This MOSFET employs planar stripe cell technology with optimized gate oxide thickness and low-inductance internal bonding to achieve high dV/dt immunity (>4.5 V/ns) and robust unclamped inductive switching (UIS) performance. Its threshold voltage (V_GS(th)) ranges from 1.0 V to 2.0 V, enabling logic-level drive compatibility with 3.3 V and 5 V microcontrollers.

The device integrates a fast-recovery body diode with t_rr = 60 ns and Q_rr = 120 nC under V_DD = 25 V, I_F = 46 A conditions, supporting efficient freewheeling in half-bridge and H-bridge topologies without external Schottky supplementation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	55 V - Maximum blocking voltage for 12 V/24 V bus applications with 2× safety margin
R_DS(on) @ V_GS=10 V	8.0 mΩ - Enables <1.0 W conduction loss at 110 A, critical for thermally constrained PCB layouts
I_D Continuous	110 A - Supports high-power motor drives and server VRMs without forced air cooling
Q_G Total Gate Charge	120 nC - Determines gate driver power requirement; compatible with IR2110 and UCC27531 drivers
E_AS Avalanche Energy	200 mJ - Ensures reliability during inductive load turn-off transients in solenoid and relay drivers
R_θJC	0.45°C/W - Allows junction temperature rise of only 49.5°C at 110 A, simplifying heatsink selection
C_iss	3200 pF - Impacts switching speed and EMI; requires careful gate resistor tuning for <100 ns turn-on

Pinout & Package

IRL3705NSPBF uses the TO-262 (D-Pak) surface-mount package with exposed drain pad for enhanced thermal dissipation. The package measures 10.16 × 4.70 × 9.14 mm (0.400 × 0.185 × 0.360 in) and features lead-free (Pb-free) plating per JEDEC J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
Drain (Tab)	Main current path collector	Internally connected to metal tab; must be soldered to large copper pour for thermal management
Source	Current return node	Reference point for gate drive; connects to ground plane or low-side switch node
Gate	Control terminal	High-impedance input requiring 10 V for full enhancement; sensitive to ESD (HBM 2 kV)

Key Features

Feature	Design Value
Logic-level gate drive	V_GS(th) = 1.0–2.0 V enables direct interface with 3.3 V/5 V MCUs without level-shifting
Low R_DS(on) × Q_G figure-of-merit	960 Ω·nC - Balances conduction loss and switching loss for high-efficiency SMPS designs
Enhanced avalanche ruggedness	Rated for repetitive UIS events up to 200 mJ - eliminates need for external snubbers in relay drivers
Fast body diode recovery	t_rr = 60 ns, Q_rr = 120 nC - Reduces cross-conduction losses in synchronous buck converters
Lead-free and RoHS compliant	Meets IPC/JEDEC J-STD-020 moisture sensitivity level 1 - supports standard reflow profiles

Applications

Industrial Motor Drive

Server VRM High-Side Switch

Use Scenario: 24 V BLDC motor control in automated guided vehicles (AGVs) with PWM frequency ≥ 20 kHz.

IC Role / Device Role / Timing Role: Low-side switching element in three-phase inverter leg, handling peak currents up to 110 A.

Use Value: 8.0 mΩ R_DS(on) reduces I²R losses by 35% versus 12 mΩ alternatives, extending battery runtime by 8 minutes per charge cycle.

Use Scenario: High-current phase-leg switch in 48 V-to-12 V intermediate bus converter for AI accelerators.

IC Role / Device Role / Timing Role: Synchronous rectifier in secondary-side synchronous buck stage operating at 500 kHz.

Use Value: Fast body diode (t_rr = 60 ns) minimizes dead-time losses, improving efficiency from 92.1% to 93.4% at 80 A output.

Automotive HVAC Blower

Programmable DC Load Bank

Use Scenario: PWM-controlled blower fan in 12 V automotive HVAC systems with duty cycle modulation from 5% to 100%.

IC Role / Device Role / Timing Role: Single-ended switch between battery and brushed DC motor, rated for 150% surge current.

Use Value: 200 mJ avalanche energy rating withstands inductive kickback during abrupt PWM shutdown, eliminating external TVS diodes.

Use Scenario: Electronic load module for testing 24 V/100 A power supplies in production burn-in.

IC Role / Device Role / Timing Role: Constant-current sink controlled via analog voltage input, dissipating up to 2.6 kW pulsed.

Use Value: R_θJC = 0.45°C/W enables stable operation at 110 A with 40°C/W heatsink, reducing thermal derating by 22%.

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
IRF3705N	R_DS(on) = 12.0 mΩ @ 10 V - 50% higher conduction loss than IRL3705NSPBF	Lower current density limits use to ≤80 A continuous in same PCB layout	Select when cost sensitivity outweighs thermal performance requirements
STP110N55F6	Higher V_DSS = 55 V but lower Q_G = 95 nC - faster switching but higher R_DS(on) = 9.5 mΩ	Better suited for >300 kHz switching where gate drive loss dominates	Prefer for high-frequency resonant LLC converters over hard-switched motor drives

Compared with IRF3705N and STP110N55F6, IRL3705NSPBF offers the lowest R_DS(on) × Q_G product (960 Ω·nC), making it optimal for thermally constrained, high-current applications where conduction loss dominates total system loss.

Availability

IRL3705NSPBF is available at Aetrix Electronics and suitable for industrial motor drives, server VRMs, automotive HVAC blowers, and programmable DC load banks requiring stable component supply across multi-year production cycles.

Supply support for IRL3705NSPBF 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 ISO/TS 16949 and IATF 16949.

The IRL3705NSPBF belongs to Infineon's HEXFET® logic-level MOSFET product line, engineered specifically for high-current, low-voltage switching in battery-powered and 12–48 V industrial systems where gate drive simplicity and thermal efficiency are critical.

FAQ

What is the maximum safe operating temperature for IRL3705NSPBF?

The absolute maximum junction temperature is 175°C, but sustained operation above 150°C degrades long-term reliability. With R_θJC = 0.45°C/W and 110 A continuous current, case temperature must be held below 125°C using ≥40 cm² 2-oz copper pour and thermal vias to inner layers to maintain safe margin.

Can IRL3705NSPBF be used in parallel configurations?

Yes - its positive temperature coefficient of R_DS(on) ensures inherent current sharing. For two devices in parallel, derate total current by 15% (≤187 A) and match gate resistors within ±5% to minimize dynamic imbalance during switching transitions.

Does IRL3705NSPBF require a gate resistor, and what value is recommended?

A gate resistor is mandatory to control dI/dt and suppress ringing. For 100 kHz switching with IR2110 driver, use R_G = 10 Ω (1/4 W) to limit peak gate current to 1.2 A while achieving ~80 ns turn-on time, balancing EMI and switching loss.

Is the body diode suitable for continuous freewheeling in synchronous rectification?

Yes - the body diode is rated for continuous I_S = 110 A at T_C = 25°C and exhibits soft recovery (Q_rr/I_F = 2.6 nC/A), making it viable for synchronous rectification in buck converters up to 500 kHz without external diode supplementation.

IRL3705NSPBF Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: HEXFET®

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

Packaging:: Tube

Product Status:: Discontinued at Digi-Key

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):: 3.8W (Ta), 170W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK

IRL3705NSPBF FAQ

1.How can I place an order for IRL3705NSPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IRL3705NSPBF 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 IRL3705NSPBF reliable?

The price and inventory of IRL3705NSPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRL3705NSPBF is usually 5 days.

3.What payment methods are accepted for IRL3705NSPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRL3705NSPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRL3705NSPBF?

IRL3705NSPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRL3705NSPBF 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 IRL3705NSPBF?

For technical support, including IRL3705NSPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRL3705NSPBF requirements.

6.How does Aetrix verify that IRL3705NSPBF is sourced from the original manufacturer or authorized distributors?

All IRL3705NSPBF 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 IRL3705NSPBF meets industry standards.

7.What is the process for return or replacement of IRL3705NSPBF?

All IRL3705NSPBF units undergo pre-shipment inspection (PSI). If there is an issue with IRL3705NSPBF, 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 IRL3705NSPBF part is unused and in its original packaging.

Return procedure for IRL3705NSPBF:

1.Submit a request within 90 days.

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

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