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

Infineon Technologies IRLZ44NLPBF

Name: IRLZ44NLPBF
Brand: Infineon Technologies
SKU: IRLZ44NLPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRLZ44NLPBF

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

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

Datasheet:: IRLZ44NLPBF.pdf

Description:: MOSFET N-CH 55V 47A TO262

Quantity:: RFQ Add To RFQ list

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Inventory:2,570

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Product details

Overview

IRLZ44NLPBF from Infineon Technologies is a 55 V, 49 A, 27 mΩ N-channel logic-level MOSFET in TO-262 (DPAK) package, optimized for DC-DC converters, motor drives, and high-efficiency switching power supplies operating at 10 V gate drive. It features low R_DS(on), fast switching, and enhanced body diode recovery.

For engineers reviewing the IRLZ44NLPBF datasheet, IRLZ44NLPBF pinout, IRLZ44NLPBF application, or IRLZ44NLPBF equivalent, key selection criteria include its 27 mΩ on-resistance at V_GS = 10 V, 49 A continuous drain current, TO-262 thermal performance, and logic-level gate threshold (V_GS(th) = 2.0–4.0 V).

Technical Context

This MOSFET uses planar silicon process with optimized channel geometry to achieve low conduction loss and controlled gate charge (Q_G = 58 nC). Its body diode exhibits t_rr = 53 ns and Q_RR = 32 nC under I_F = 25 A, V_DD = 25 V conditions, supporting synchronous rectification and hard-switched topologies.

The device is rated for 175 °C junction temperature and supports repetitive avalanche energy E_AS = 125 mJ at T_J = 25 °C. Safe operating area (SOA) is defined up to 10 ms single-pulse with V_DS ≤ 44 V and I_D ≤ 41 A at T_C = 25 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	55 V - Maximum blocking voltage before avalanche onset; supports 48 V bus systems with margin.
R_DS(on) @ V_GS = 10 V	27 mΩ - Enables <1.3 W conduction loss at 49 A, reducing heatsink requirements.
I_D (continuous)	49 A @ T_C = 25 °C - Sustains high-current loads in motor H-bridge or SMPS output stages.
Q_G	58 nC - Determines gate driver power and switching speed; compatible with standard 1-A drivers.
V_GS(th)	2.0–4.0 V - Logic-level threshold ensures full enhancement with 3.3 V or 5 V microcontroller outputs.
t_r/t_f	25/40 ns - Supports >100 kHz switching in buck converters without excessive switching loss.
E_AS	125 mJ - Withstands inductive kickback in relay/motor drive without external snubbers.

Pinout & Package

IRLZ44NLPBF is housed in a TO-262 (DPAK) surface-mount package with exposed drain pad for thermal dissipation. The package measures 10.16 × 4.70 × 2.39 mm and is lead-free (Pb-free) per RoHS.

Pin/Terminal	Circuit Role	Design Meaning
Drain (D)	Main current path collector	Internally connected to exposed copper pad; must be soldered to large PCB copper pour for thermal management.
Gate (G)	Control electrode	High-impedance input requiring <1 µA bias; sensitive to ESD-requires gate resistor and TVS protection.
Source (S)	Current return reference	Common node for load return and gate drive reference; ties to system ground in low-side switch configuration.

Key Features

Feature	Design Value
Logic-level gate drive compatibility	Operates fully enhanced at V_GS ≥ 4.5 V-enables direct interface with 3.3 V/5 V MCUs without level-shifting.
Low gate charge (Q_G)	58 nC reduces driver power consumption and enables faster turn-on/turn-off transitions.
Enhanced body diode recovery	t_rr = 53 ns and soft recovery minimize voltage overshoot and EMI in freewheeling paths.
Repetitive avalanche rated	Rated for 125 mJ single-pulse avalanche energy-supports robust operation in inductive load switching.

Applications

Motor Control

DC-DC Converters

Use Scenario: Half-bridge driving of 24–48 V brushed DC motors in industrial actuators and robotics.

IC Role / Device Role / Timing Role: Low-side switch in H-bridge topology; handles bidirectional current up to 49 A with minimal conduction loss.

Use Value: 27 mΩ R_DS(on) limits I²R loss to <65 W at peak current, enabling compact thermal design without forced air cooling.

Use Scenario: Synchronous rectifier in 12 V → 3.3 V/5 V buck converters for server VRMs and telecom PSUs.

IC Role / Device Role / Timing Role: Secondary-side power switch replacing Schottky diode; commutated by controller PWM signal.

Use Value: Replaces 40 V/40 A Schottky with 60% lower forward conduction loss and zero reverse recovery charge.

Power Inverters

Lighting Ballasts

Use Scenario: High-side switch in 3-phase inverter stages for HVAC compressors and pump drives.

IC Role / Device Role / Timing Role: High-voltage switching element in IGBT/MOSFET hybrid inverters; driven via isolated gate driver.

Use Value: 55 V rating and 175 °C T_J support operation in ambient >85 °C environments with derating.

Use Scenario: Dimmable LED driver using phase-cut AC input and high-frequency buck-boost regulation.

IC Role / Device Role / Timing Role: Primary-side switch controlling energy transfer into coupled inductor; switched at 50–100 kHz.

Use Value: Fast t_r/t_f and low Q_G reduce switching losses to <1.2 W at 100 kHz, improving efficiency to >92%.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRFZ44NPBF	R_DS(on) = 28 mΩ @ 10 V; same TO-220 package; no lead-free marking.	Higher thermal resistance (R_θJC = 1.5 K/W vs. 1.0 K/W) limits power density in SMT layouts.	Prefer IRLZ44NLPBF for surface-mount designs requiring higher current density and RoHS compliance.
STP55NF06L	R_DS(on) = 14 mΩ @ 10 V; 60 V rating; TO-220 package; V_GS(th) = 1.0–2.5 V.	Lower threshold increases risk of spurious turn-on in noisy environments; requires tighter gate control.	Choose STP55NF06L only when <15 mΩ R_DS(on) is critical and gate drive noise is well-filtered.

Compared with IRFZ44NPBF and STP55NF06L, IRLZ44NLPBF offers optimal balance of logic-level drive safety, TO-262 thermal performance, and 27 mΩ conduction loss-making it preferred for space-constrained, high-reliability 48 V power systems.

Availability

IRLZ44NLPBF is available at Aetrix Electronics and suitable for motor control, DC-DC conversion, power inverters, and lighting ballasts requiring stable component supply and long-term manufacturing continuity.

Supply support for IRLZ44NLPBF 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 ICs, and industrial MOSFETs, with global manufacturing and quality certification to ISO/TS 16949 and IECQ QC 080000.

The StrongIRFET™ product line delivers high-current, low-R_DS(on) MOSFETs for industrial switching, designed specifically for efficiency-critical 24–60 V power conversion and motor drive applications.

FAQ

What is the maximum safe operating junction temperature for IRLZ44NLPBF?

The absolute maximum junction temperature is 175 °C. Continuous operation above 150 °C requires derating I_D per the SOA curve; thermal design must maintain T_J ≤ 150 °C for 10-year reliability in industrial environments.

Does IRLZ44NLPBF require a gate resistor, and what value is recommended?

Yes-a series gate resistor (10–47 Ω) is required to dampen ringing and limit peak gate current. For 1-A drivers switching at 100 kHz, 22 Ω provides optimal tradeoff between switching speed and EMI suppression without overstressing the driver.

Can IRLZ44NLPBF replace IRLZ44N in existing designs?

Yes-IRLZ44NLPBF is a direct drop-in replacement for IRLZ44N, sharing identical electrical specs, pinout, and TO-262 footprint. The "LPBF" suffix denotes lead-free finish and updated packaging; no layout or firmware changes are needed.

Is the body diode in IRLZ44NLPBF suitable for synchronous rectification?

Yes-the body diode has t_rr = 53 ns and Q_RR = 32 nC at I_F = 25 A, enabling use in synchronous buck converters up to 200 kHz. However, external Schottky diodes remain preferred for >300 kHz due to lower Q_RR.

IRLZ44NLPBF 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:: 47A (Tc)

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

Rds On (Max) @ Id, Vgs:: 22mOhm @ 25A, 10V

Vgs(th) (Max) @ Id:: 2V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 48 nC @ 5 V

Vgs (Max):: ±16V

Input Capacitance (Ciss) (Max) @ Vds:: 1700 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 3.8W (Ta), 110W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-262

IRLZ44NLPBF FAQ

1.How can I place an order for IRLZ44NLPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IRLZ44NLPBF 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 IRLZ44NLPBF reliable?

The price and inventory of IRLZ44NLPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRLZ44NLPBF is usually 5 days.

3.What payment methods are accepted for IRLZ44NLPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRLZ44NLPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRLZ44NLPBF?

IRLZ44NLPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRLZ44NLPBF 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 IRLZ44NLPBF?

For technical support, including IRLZ44NLPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRLZ44NLPBF requirements.

6.How does Aetrix verify that IRLZ44NLPBF is sourced from the original manufacturer or authorized distributors?

All IRLZ44NLPBF 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 IRLZ44NLPBF meets industry standards.

7.What is the process for return or replacement of IRLZ44NLPBF?

All IRLZ44NLPBF units undergo pre-shipment inspection (PSI). If there is an issue with IRLZ44NLPBF, 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 IRLZ44NLPBF part is unused and in its original packaging.

Return procedure for IRLZ44NLPBF:

1.Submit a request within 90 days.

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

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