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

Infineon Technologies IRFR3708TRLPBF

Name: IRFR3708TRLPBF
Brand: Infineon Technologies
SKU: IRFR3708TRLPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRFR3708TRLPBF

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: IRFR3708TRLPBF.pdf

Description:: MOSFET N-CH 30V 61A DPAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

IRFR3708TRLPBF from Infineon Technologies (formerly International Rectifier) is a 30V, 61A N-channel enhancement-mode Power MOSFET in D-Pak (TO-252) package, featuring 12.5mΩ R_DS(on) at V_GS = 10V and ultra-low gate charge (24nC), optimized for high-frequency synchronous rectification in isolated DC-DC converters for telecom and industrial power supplies.

For engineers reviewing the IRFR3708TRLPBF datasheet, IRFR3708TRLPBF pinout, IRFR3708TRLPBF application, or IRFR3708TRLPBF equivalent, key selection criteria include its 4.5V logic-level gate drive capability, 213mJ single-pulse avalanche energy rating, body diode reverse recovery performance (t_rr = 41–65ns), and thermal resistance (R_θJC = 1.73°C/W) for high-power-density SMPS designs.

Technical Context

This HEXFET device employs planar stripe cell structure with optimized gate oxide thickness to achieve low R_DS(on) while maintaining robust 30V breakdown voltage (V_(BR)DSS) and stable threshold voltage (0.6–2.0V). Its dynamic parameters-including 5.8nC Miller charge (Q_gd) and 2417pF input capacitance (C_iss)-are characterized at V_DS = 15V and support fast switching up to several hundred kHz.

The integrated body diode exhibits low forward voltage (0.88V @ 31A, 25°C) and tightly specified reverse recovery (Q_rr = 64–105nC), enabling efficient synchronous rectification without external Schottky replacement in 48V-input telecom converters. Thermal design leverages low junction-to-case resistance (1.73°C/W) for direct heatsink mounting via the exposed drain pad.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30V - Maximum blocking voltage compatible with 24V/48V intermediate bus architectures
R_DS(on) max @ V_GS = 10V	12.5mΩ - Enables <1W conduction loss at 61A continuous current in PCB-mount applications
I_D @ T_A = 25°C	61A - Continuous current rating under ideal heatsinking, supporting >300W output stages
Q_g	24nC - Low total gate charge reduces driver power and enables efficient 500kHz+ operation
E_AS	213mJ - Avalanche-rated for unclamped inductive switching stress in hard-switched topologies
R_θJC	1.73°C/W - Enables direct thermal path to heatsink; critical for compact, fanless industrial SMPS
t_rr @ 25°C	41–62ns - Fast body diode recovery minimizes cross-conduction losses in synchronous buck converters

Pinout & Package

IRFR3708TRLPBF uses the surface-mount D-Pak (TO-252) package with an exposed drain pad on the bottom side for thermal and electrical connection. The three terminals are arranged in a single-row configuration suitable for automated PCB assembly.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Source)	Source terminal of N-channel MOSFET	Low-impedance return path for load current; tied to power ground plane
Pin 2 (Gate)	Control electrode	Receives logic-level (≥4.5V) drive signal; requires <24nC charge for full enhancement
Pin 3 (Drain)	Main current-carrying terminal	Connected to exposed copper pad; serves as primary heat sink interface and high-side switching node

Key Features

Feature	Design Value
Ultra-low R_DS(on) at 4.5V	14mΩ max - Enables direct interfacing with 3.3V/5V microcontrollers without level-shifting
Fully characterized avalanche	213mJ E_AS, 62A I_AR - Guarantees ruggedness in flyback and forward converter primary switches
Optimized body diode	Q_rr = 64–105nC, t_rr = 41–65ns - Reduces switching loss and EMI in synchronous rectifier mode
Lead-free and RoHS compliant	IRFR3708TRLPBF suffix - Meets IPC-J-STD-020 reflow profile requirements for Pb-free assembly

Applications

Telecom DC-DC Converters

Industrial SMPS

Use Scenario: 48V-to-12V isolated half-bridge converter in base station power modules.

IC Role / Device Role / Timing Role: Synchronous rectifier on secondary side, replacing Schottky diodes to improve efficiency above 92%.

Use Value: 12.5mΩ R_DS(on) cuts conduction loss by >40% vs. 40V Schottky, reducing thermal load on PCB.

Use Scenario: 24V input, 5V/30A output buck converter in programmable logic controller (PLC) power supply.

IC Role / Device Role / Timing Role: High-side switch operating at 300kHz with 4.5V gate drive from PWM controller.

Use Value: 24nC Q_g allows use of low-cost gate drivers (e.g., IR2110) without excessive power dissipation.

Server VRMs

Motor Drive Half-Bridge

Use Scenario: Point-of-load (POL) converter delivering 1.2V/100A to CPU core.

IC Role / Device Role / Timing Role: Lower-side switch in multiphase buck topology, conducting during high-duty-cycle periods.

Use Value: 1.73°C/W R_θJC supports direct heatsink attachment, maintaining T_J < 125°C at full load.

Use Scenario: 24V BLDC motor driver half-bridge stage for HVAC fan control.

IC Role / Device Role / Timing Role: Low-side switch commutating 30A peak phase current with 100ns dead-time margin.

Use Value: 213mJ E_AS withstands inductive kickback during rapid PWM transitions without snubbers.

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
IRL3708PBF	R_DS(on) = 14mΩ @ 4.5V (vs. 12.5mΩ @ 10V); higher Q_g = 32nC	Better suited for 3.3V gate drive; less efficient at 10V due to higher on-resistance	Select when gate drive voltage is limited to ≤4.5V and lower switching frequency (<200kHz) is acceptable
STP30NF20	V_DS = 200V, R_DS(on) = 38mΩ @ 10V, Q_g = 45nC - higher voltage, lower speed	Designed for 100–200V flyback primaries; unsuitable for 30V synchronous rectification	Only consider for higher-voltage, lower-frequency applications where 30V rating is insufficient

Compared with IRL3708PBF and STP30NF20, IRFR3708TRLPBF delivers optimal balance of low R_DS(on), fast switching, and 30V rating for high-efficiency, high-frequency DC-DC conversion-making it preferred for telecom and server power where thermal density and efficiency are critical.

Availability

IRFR3708TRLPBF is available at Aetrix Electronics and suitable for telecom DC-DC converters, industrial SMPS, and server VRMs requiring stable component supply, consistent lead-free compliance, and traceable lot-level documentation.

Supply support for IRFR3708TRLPBF 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 acquired International Rectifier in 2015 and continues to manufacture and support the HEXFET® Power MOSFET portfolio with full backward compatibility and extended product longevity.

The IRFR/U3708 series belongs to Infineon's logic-level N-channel MOSFET product line, engineered specifically for high-efficiency, high-frequency switching in isolated and non-isolated DC-DC converters across telecom, computing, and industrial markets.

FAQ

What is the maximum continuous drain current at 70°C ambient temperature?

The IRFR3708TRLPBF supports 51A continuous drain current at T_A = 70°C with proper PCB copper area (1"² FR-4) and no forced airflow. This rating assumes junction temperature remains below 175°C, governed by R_θJA = 50°C/W under those conditions. Derating follows 0.58W/°C beyond 70°C ambient.

Does this MOSFET require a gate resistor for safe operation?

A gate resistor (typically 1–10Ω) is recommended to dampen ringing and control dV/dt during switching, especially given its low Q_gd/Q_g ratio and fast turn-off characteristics. The datasheet specifies switching times with R_G = 0.6Ω; increasing R_G improves EMI but extends td(off) and tf proportionally.

Can IRFR3708TRLPBF be used in linear (analog) mode applications?

No-it is not rated or characterized for linear-mode operation. Its Safe Operating Area (SOA) curve limits continuous operation to pulse widths ≤10ms at V_DS > 10V, and sustained linear bias risks thermal runaway due to positive R_DS(on) temperature coefficient above 100°C. Use only in switched-mode configurations.

Is the body diode suitable for freewheeling in boost converters?

Yes-the body diode is fully characterized with t_rr = 41–65ns and Q_rr = 64–105nC, making it viable for freewheeling in medium-frequency (≤500kHz) boost converters. However, for highest efficiency, pairing with an external Schottky diode is advised when diode conduction time exceeds 30% of switching period.

IRFR3708TRLPBF Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: HEXFET®

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 30 V

Current - Continuous Drain (Id) @ 25°C:: 61A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 2.8V, 10V

Rds On (Max) @ Id, Vgs:: 12.5mOhm @ 15A, 10V

Vgs(th) (Max) @ Id:: 2V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 24 nC @ 4.5 V

Vgs (Max):: ±12V

Input Capacitance (Ciss) (Max) @ Vds:: 2417 pF @ 15 V

FET Feature:: -

Power Dissipation (Max):: 87W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-252AA (DPAK)

IRFR3708TRLPBF FAQ

1.How can I place an order for IRFR3708TRLPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IRFR3708TRLPBF 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 IRFR3708TRLPBF reliable?

The price and inventory of IRFR3708TRLPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRFR3708TRLPBF is usually 5 days.

3.What payment methods are accepted for IRFR3708TRLPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRFR3708TRLPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRFR3708TRLPBF?

IRFR3708TRLPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRFR3708TRLPBF 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 IRFR3708TRLPBF?

For technical support, including IRFR3708TRLPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRFR3708TRLPBF requirements.

6.How does Aetrix verify that IRFR3708TRLPBF is sourced from the original manufacturer or authorized distributors?

All IRFR3708TRLPBF 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 IRFR3708TRLPBF meets industry standards.

7.What is the process for return or replacement of IRFR3708TRLPBF?

All IRFR3708TRLPBF units undergo pre-shipment inspection (PSI). If there is an issue with IRFR3708TRLPBF, 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 IRFR3708TRLPBF part is unused and in its original packaging.

Return procedure for IRFR3708TRLPBF:

1.Submit a request within 90 days.

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

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