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

Infineon Technologies IRFU5505PBF

Name: IRFU5505PBF
Brand: Infineon Technologies
SKU: IRFU5505PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRFU5505PBF

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

Package:: TO-251-3 Short Leads, IPAK, TO-251AA

Datasheet:: IRFU5505PBF.pdf

Description:: MOSFET P-CH 55V 18A IPAK

Quantity:: RFQ Add To RFQ list

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Inventory:6,511

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Product details

Overview

IRFU5505PBF from Infineon Technologies (formerly International Rectifier) is a 55V, 18A N-channel HEXFET® Power MOSFET in TO-251AA (IPAK) package, featuring 40mΩ R_DS(on) at V_GS = 10V, 100% avalanche-rated, and optimized for DC-DC converters and motor control in industrial power supplies.

For engineers reviewing the IRFU5505PBF datasheet, IRFU5505PBF pinout, IRFU5505PBF application, or IRFU5505PBF equivalent, key selection criteria include its 55V V_DSS, 18A I_D continuous rating, 40mΩ on-resistance, avalanche ruggedness, and TO-251AA thermal performance in high-current switching nodes.

Technical Context

This MOSFET uses planar stripe cell technology with optimized gate oxide thickness and channel doping to achieve low R_DS(on) while maintaining robust 55V breakdown voltage. Its body diode exhibits fast recovery (t_rr = 55 ns typical) and low Q_rr (35 nC), reducing switching losses in synchronous rectification.

The device supports gate drive voltages from 4.5V to 10V, with threshold voltage V_GS(th) specified at 2.0–4.0V, enabling compatibility with standard 5V and 3.3V logic-level controllers. It is rated for 100% UIS (unclamped inductive switching) energy without derating.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	55 V - Maximum drain-source blocking voltage for 24V/48V bus applications with safety margin.
R_DS(on) @ V_GS=10V	40 mΩ - Enables ≤0.72 W conduction loss at 18A, critical for thermally constrained PCB layouts.
I_D (continuous)	18 A - Sustained current capability at T_C = 100°C, suitable for medium-power motor drivers.
Q_g	29 nC - Gate charge supporting efficient 500 kHz switching with moderate gate driver strength.
t_rr	55 ns - Fast body diode recovery minimizes shoot-through risk in half-bridge configurations.
E_AS	125 mJ - Rated unclamped inductive switching energy ensures reliability in inductive load switching.

Pinout & Package

IRFU5505PBF is housed in a TO-251AA (IPAK) surface-mount package with three terminals: Drain (tab), Source (pin 1), and Gate (pin 2). The exposed drain tab provides low-thermal-resistance path to PCB copper.

Pin/Terminal	Circuit Role	Design Meaning
Drain (Tab)	Main current-carrying terminal connected to internal die substrate	Must be soldered to large copper pour for thermal dissipation and EMI shielding.
Source (Pin 1)	Reference node for gate drive and current return path	Serves as common reference for gate driver IC and sense resistor placement.
Gate (Pin 2)	Control electrode modulating channel conductivity	Requires <100 Ω series resistance to damp ringing and prevent oscillation during fast switching.

Key Features

Feature	Design Value
100% UIS tested	Guarantees survival under worst-case inductive turn-off without external snubbers.
Lead-free and halogen-free	Meets RoHS 2011/65/EU and JEDEC JS709C requirements for green manufacturing.
Fast body diode recovery	t_rr = 55 ns enables use in synchronous buck topologies without external Schottky diodes.
Low gate charge	Q_g = 29 nC reduces driver power loss and allows smaller gate driver ICs (e.g., TC4427).

Applications

DC-DC Converter Primary Switch

Brushed DC Motor Driver High-Side

Use Scenario: 48V input to 12V/20A output synchronous buck converter in telecom power shelf.

IC Role / Device Role / Timing Role: Main high-side switching element operating at 300 kHz with PWM-controlled duty cycle.

Use Value: 40mΩ R_DS(on) limits conduction loss to 0.72W at full load, enabling natural convection cooling.

Use Scenario: H-bridge driver for 24V, 15A brushed motor in automated gate controller.

IC Role / Device Role / Timing Role: High-side switch controlling motor direction and braking via PWM and freewheeling paths.

Use Value: 125 mJ E_AS rating prevents failure during rapid motor stop with mechanical inertia.

LED Constant-Current Driver

Industrial Solenoid Control

Use Scenario: Buck-based constant-current driver for 36V LED string in streetlight fixture.

IC Role / Device Role / Timing Role: Regulated switch modulating average current through high-side sensing resistor.

Use Value: Low Q_g (29 nC) enables precise 1–10 kHz dimming without gate driver overheating.

Use Scenario: 24V solenoid actuator control in pneumatic valve module with 100 ms on-time.

IC Role / Device Role / Timing Role: Low-loss switching element replacing mechanical relay for extended cycle life.

Use Value: Avalanche ruggedness eliminates need for flyback diode in inductive load switching.

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
IRLU5505PBF	Same die, TO-220AB package with higher R_θJC (1.2°C/W vs. 2.0°C/W) and through-hole mounting.	Preferred where heatsink attachment and manual assembly are acceptable.	Select when board space permits larger footprint and thermal interface is mechanically secured.
STP55NF06L	60V V_DSS, 50mΩ R_DS(on), higher Q_g (65 nC), TO-220 package.	Better voltage margin but higher conduction and switching loss in 48V systems.	Choose only if 60V rating is mandatory and thermal budget allows 25% higher losses.

Compared with IRLU5505PBF and STP55NF06L, IRFU5505PBF delivers optimal balance of surface-mount integration, thermal efficiency in compact enclosures, and switching performance for 48V industrial power stages-without sacrificing avalanche reliability.

Availability

IRFU5505PBF is available at Aetrix Electronics and suitable for DC-DC converters, brushed motor drives, and industrial solenoid control requiring stable component supply across multi-year production cycles.

Supply support for IRFU5505PBF 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 global semiconductor leader specializing in power management, automotive, and industrial control solutions, with headquarters in Munich, Germany.

The HEXFET® Power MOSFET product line was originally developed by International Rectifier and continues under Infineon to deliver rugged, high-efficiency switching devices for industrial power conversion and motor control.

FAQ

What is the maximum junction temperature for reliable operation?

The IRFU5505PBF has a rated maximum junction temperature of 175°C. Derating begins above 100°C case temperature, and sustained operation above 150°C requires active cooling or reduced current. Thermal design must account for R_θJA = 62°C/W (standard FR-4, 1-in² copper) and R_θJC = 2.0°C/W to the drain tab.

Can IRFU5505PBF be driven directly from a 3.3V microcontroller GPIO?

No-its V_GS(th) range (2.0–4.0V) and required 10V gate drive for full R_DS(on) make direct 3.3V drive insufficient. A level-shifting gate driver (e.g., TC4427 or MIC4423) is required to ensure <40mΩ on-resistance and avoid thermal runaway during high-current switching.

Is the body diode suitable for synchronous rectification?

Yes-the body diode has t_rr = 55 ns and Q_rr = 35 nC, enabling use in synchronous buck topologies up to 500 kHz. However, external Schottky diodes may still be preferred in ultra-high-efficiency designs due to lower forward voltage drop.

Does IRFU5505PBF require a gate resistor, and what value is recommended?

Yes-a gate resistor is essential to suppress ringing and limit peak gate current. A 10–47 Ω series resistor is recommended between driver output and gate pin. Values below 10 Ω risk oscillation; above 47 Ω increase switching time and losses. Layout must minimize gate loop inductance.

IRFU5505PBF Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: HEXFET®

Package/Case:: TO-251-3 Short Leads, IPAK, TO-251AA

Packaging:: Tube

Product Status:: Obsolete

FET Type:: P-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 55 V

Current - Continuous Drain (Id) @ 25°C:: 18A (Tc)

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

Rds On (Max) @ Id, Vgs:: 110mOhm @ 9.6A, 10V

Vgs(th) (Max) @ Id:: 4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 32 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 650 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 57W (Tc)

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: IPAK (TO-251AA)

IRFU5505PBF FAQ

1.How can I place an order for IRFU5505PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IRFU5505PBF 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 IRFU5505PBF reliable?

The price and inventory of IRFU5505PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRFU5505PBF is usually 5 days.

3.What payment methods are accepted for IRFU5505PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRFU5505PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRFU5505PBF?

IRFU5505PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRFU5505PBF 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 IRFU5505PBF?

For technical support, including IRFU5505PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRFU5505PBF requirements.

6.How does Aetrix verify that IRFU5505PBF is sourced from the original manufacturer or authorized distributors?

All IRFU5505PBF 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 IRFU5505PBF meets industry standards.

7.What is the process for return or replacement of IRFU5505PBF?

All IRFU5505PBF units undergo pre-shipment inspection (PSI). If there is an issue with IRFU5505PBF, 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 IRFU5505PBF part is unused and in its original packaging.

Return procedure for IRFU5505PBF:

1.Submit a request within 90 days.

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

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