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

Infineon Technologies IRFZ46ZL

Name: IRFZ46ZL
Brand: Infineon Technologies
SKU: IRFZ46ZL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRFZ46ZL

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

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

Datasheet:: IRFZ46ZL.pdf

Description:: MOSFET N-CH 55V 51A TO262

Quantity:: RFQ Add To RFQ list

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Product details

Overview

IRFZ46ZL from Infineon Technologies (formerly International Rectifier) is an N-channel enhancement-mode HEXFET® Power MOSFET in TO-262 (I²PAK) package, rated for 55V V_DSS, 13.6mΩ R_DS(on) at V_GS = 10V, and 51A continuous drain current at T_C = 25°C. It features 175°C junction temperature rating, fast switching (t_r = 63ns), and 100% production-tested repetitive avalanche capability up to I_AR = 31A - used in DC-DC converters, motor drives, and uninterruptible power supplies.

For engineers reviewing the IRFZ46ZL datasheet, IRFZ46ZL pinout, IRFZ46ZL application, or IRFZ46ZL equivalent, key selection criteria include its low R_DS(on) for conduction loss reduction, robust body diode (t_rr = 21–31ns, Q_rr = 16–24nC), thermal performance (R_θJC = 1.84°C/W), and TO-262 package compatibility with high-current PCB layouts.

Technical Context

This device employs advanced silicon processing to minimize on-resistance per die area while maintaining high avalanche ruggedness. Its gate threshold voltage (V_GS(th) = 2.0–4.0V) enables reliable turn-on with standard 5V/10V logic-level drivers, and its low C_iss (1460pF) and C_rss (130pF) support efficient high-frequency switching up to several hundred kHz.

The integrated body diode exhibits low forward voltage (V_SD ≤ 1.3V at 31A) and controlled reverse recovery (Q_rr = 16–24nC), reducing switching losses in hard-commutated topologies. Repetitive avalanche operation is thermally limited and validated per Fig. 12a–16, with E_AR = 63mJ at T_J = 25°C and duty cycle ≤2%.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	55V - maximum blocking voltage before avalanche onset; defines safe operating range in 48V bus systems.
R_DS(on)	13.6mΩ max @ V_GS = 10V - determines conduction loss (P_cond ≈ I_D² × R_DS(on)) in high-current paths.
I_D (continuous)	51A @ T_C = 25°C - usable current capacity with adequate heatsinking; derates to 36A at 100°C case temp.
Q_g	46nC max - total gate charge defining driver strength requirement; impacts switching speed and gate drive loss.
t_r/t_f	63ns / 39ns - rise/fall times at V_DD = 25V, I_D = 31A, R_G = 15Ω; sets minimum practical switching frequency.
E_AS	300mJ - single-pulse avalanche energy rating; enables unclamped inductive switching without failure if T_J ≤ 175°C.
V_GS(th)	2.0–4.0V - gate threshold range ensuring turn-on margin with 3.3V/5V controllers and immunity to noise-induced false triggering.

Pinout & Package

IRFZ46ZL uses the TO-262 (I²PAK) surface-mount-compatible package with isolated tab, offering low thermal resistance (R_θJC = 1.84°C/W) and mechanical robustness for high-power applications. The three-terminal configuration supports high-current source-drain paths with minimal parasitic inductance.

Pin/Terminal	Circuit Role	Design Meaning
Drain (D)	Main current sink terminal	Connected to high-side switch node or DC bus; electrically tied to metal tab for thermal conduction.
Source (S)	Main current return path	Reference node for gate drive; carries full load current and body diode reverse recovery charge.
Gate (G)	Control input	High-impedance MOS control electrode; requires <1µA steady-state bias but 46nC transient charge for full turn-on.

Key Features

Feature	Design Value
Ultra-low R_DS(on)	13.6mΩ enables <0.3W conduction loss at 50A, reducing heatsink size and system footprint in 48V industrial SMPS.
175°C junction rating	Extends operational margin in sealed enclosures or high-ambient environments without derating beyond datasheet curves.
Repetitive avalanche rated	Validated for repeated unclamped inductive switching (E_AR = 63mJ), eliminating need for external snubbers in relay/motor drive flyback paths.
Fast body diode	21–31ns t_rr and 16–24nC Q_rr minimize commutation loss and voltage overshoot during synchronous rectification or freewheeling.

Applications

Motor Drive Inverter Stage

DC-DC Synchronous Buck Converter

Use Scenario: Half-bridge leg in 24–48V BLDC motor controllers driving fans, pumps, or power tools.

IC Role / Device Role / Timing Role: High-side or low-side switching element handling 30–50A peak currents with PWM frequencies up to 100kHz.

Use Value: Low R_DS(on) reduces I²R loss during conduction; fast switching and low Q_g minimize transition loss; rugged body diode handles freewheeling without external diodes.

Use Scenario: Main power switch in 48V-to-12V automotive or industrial buck converters delivering >30A output.

IC Role / Device Role / Timing Role: Primary high-side FET synchronized with low-side MOSFET or controller IC; switched at 200–500kHz.

Use Value: 13.6mΩ R_DS(on) limits conduction loss to <1W at 40A; low C_rss (130pF) suppresses Miller-induced shoot-through; TO-262 tab enables direct heatsink mounting.

Uninterruptible Power Supply (UPS) Output Stage

Industrial Solid-State Relay (SSR)

Use Scenario: Inverter bridge in line-interactive UPS systems converting 48V battery to 120/230VAC via H-bridge and transformer.

IC Role / Device Role / Timing Role: Bidirectional switching element subjected to repetitive inductive stress and grid-synchronized commutation.

Use Value: 300mJ E_AS and 63mJ E_AR allow safe operation during transformer saturation events; 175°C rating sustains reliability under sustained overload conditions.

Use Scenario: Load-switching element in DIN-rail mounted SSRs controlling HVAC actuators, lighting ballasts, or PLC outputs.

IC Role / Device Role / Timing Role: Isolated power switch replacing electromechanical relays; driven by optocoupled gate driver.

Use Value: TO-262 package provides creepage/clearance compliance; low V_GS(th) ensures turn-on with standard 5V logic; body diode eliminates need for external flyback protection.

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
STP55NF06L	60V V_DSS, 14mΩ R_DS(on), TO-220 package, higher Q_g (65nC)	Larger package footprint; lower thermal conductivity (R_θJC = 2.5°C/W)	Prefer when 60V margin is required and board space allows TO-220 mounting.
IPP040N04L	40V V_DSS, 4.0mΩ R_DS(on), PG-TO263-3 package, lower V_GS(th) (1.2–2.2V)	Not suitable for 48V bus; optimized for 12–24V systems with ultra-low loss	Select only for sub-36V applications where <5mΩ R_DS(on) justifies voltage derating.

Compared with STP55NF06L and IPP040N04L, IRFZ46ZL delivers optimal balance of 55V rating, 13.6mΩ conduction loss, TO-262 thermal performance, and proven avalanche ruggedness - making it preferred for 48V industrial switching where reliability under transient stress is critical.

Availability

IRFZ46ZL is available at Aetrix Electronics and suitable for motor drives, DC-DC converters, and uninterruptible power supplies requiring stable component supply and long-term industrial lifecycle support.

Supply support for IRFZ46ZL 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, sensor, and automotive ICs, with deep expertise in silicon-based power devices and wide-bandgap technologies.

The IRFZ46ZL belongs to Infineon's legacy HEXFET® Power MOSFET product line, designed specifically for high-efficiency, high-reliability switching in industrial power conversion, motor control, and energy infrastructure applications.

FAQ

What is the maximum continuous drain current for IRFZ46ZL at 100°C case temperature?

The IRFZ46ZL supports 36A continuous drain current at T_C = 100°C, as specified in the Absolute Maximum Ratings table. This value reflects silicon-limited current with V_GS = 10V and accounts for thermal derating due to reduced channel mobility and increased R_DS(on) at elevated temperatures.

Does IRFZ46ZL require a gate resistor for safe operation?

Yes - a gate resistor (typically 10–25Ω) is required to control dV/dt and prevent oscillation during switching. The datasheet specifies t_d(on), t_r, t_d(off), and t_f using R_G = 15Ω; omitting it risks ringing, shoot-through, and gate oxide stress due to the 46nC total gate charge and low gate impedance.

Can IRFZ46ZL be used in synchronous rectification topologies?

Yes - its body diode has characterized reverse recovery (t_rr = 21–31ns, Q_rr = 16–24nC) and low forward voltage (V_SD ≤ 1.3V), enabling use in synchronous buck or LLC secondary-side rectification. However, external synchronous FETs are preferred for highest efficiency above 100kHz due to lower Q_rr and tighter V_GS(th) control.

Is IRFZ46ZL lead-free and RoHS compliant?

Yes - the "L" suffix in IRFZ46ZL denotes lead-free (PbF) construction and RoHS compliance, confirmed by Infineon's packaging documentation. The device uses matte tin-plated leads and meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1 for reflow soldering without baking.

IRFZ46ZL 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:: 51A (Tc)

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

Rds On (Max) @ Id, Vgs:: 13.6mOhm @ 31A, 10V

Vgs(th) (Max) @ Id:: 4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 46 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 1460 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 82W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-262

IRFZ46ZL FAQ

1.How can I place an order for IRFZ46ZL through Aetrix?

Please submit a Request for Quotation (RFQ) for IRFZ46ZL 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 IRFZ46ZL reliable?

The price and inventory of IRFZ46ZL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRFZ46ZL is usually 5 days.

3.What payment methods are accepted for IRFZ46ZL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRFZ46ZL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRFZ46ZL?

IRFZ46ZL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRFZ46ZL 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 IRFZ46ZL?

For technical support, including IRFZ46ZL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRFZ46ZL requirements.

6.How does Aetrix verify that IRFZ46ZL is sourced from the original manufacturer or authorized distributors?

All IRFZ46ZL 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 IRFZ46ZL meets industry standards.

7.What is the process for return or replacement of IRFZ46ZL?

All IRFZ46ZL units undergo pre-shipment inspection (PSI). If there is an issue with IRFZ46ZL, 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 IRFZ46ZL part is unused and in its original packaging.

Return procedure for IRFZ46ZL:

1.Submit a request within 90 days.

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

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