IRFZ44NSTRRPBF N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The IRFZ44NSTRRPBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 55V drain-to-source voltage and 49A continuous drain current in a D2PAK surface mount package. This device is part of the HEXFET® series and is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and production requirements. The part operates across a temperature range of -55°C to 175°C and complies with RoHS3 and REACH standards.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	55	V
Continuous Drain Current (Id) @ 25°C	49	A (Tc)
On-Resistance (Rds On) @ 25A, 10V	17.5	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	63	nC
Input Capacitance (Ciss) @ 25V	1470	pF
Power Dissipation (Max)	3.8 (Ta), 94 (Tc)	W
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-263-3, D2PAK	-
Mounting Type	Surface Mount	-

Substitute Part Grouping Explanation

Substitution of the IRFZ44NSTRRPBF is determined by the following critical parameters:

Voltage Rating (Vdss): The substitute must equal or exceed 55V to maintain circuit protection margins.

Current Rating (Id): The substitute must support at least 49A continuous drain current to handle the design load requirements.

On-Resistance (Rds On): Lower on-resistance values improve efficiency and reduce power dissipation; values at or below 17.5mOhm @ specified conditions are preferred.

Gate Threshold Voltage (Vgs(th)): Must remain within ±20V maximum gate voltage specification for driver compatibility.

Package Compatibility: All substitutes must use D2PAK (TO-263-3) surface mount packaging to ensure PCB layout compatibility.

Temperature Range: Operating range of -55°C to 175°C must be maintained.

Compliance: RoHS3 and REACH compliance required for regulatory adherence.

Substitutes are grouped into two categories: Parametric Equivalents (identical electrical specifications) and Manufacturer Recommended Substitutes (enhanced or alternative specifications within acceptable operating parameters).

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Vgs(th) (V)	Qg (nC)	Ciss (pF)	Power Dissipation (W)	Package	Status
IRFZ44NSTRRPBF	Infineon	55	49	17.5 @ 25A, 10V	4 @ 250µA	63 @ 10V	1470 @ 25V	3.8 (Ta), 94 (Tc)	D2PAK	Discontinued
IRFZ44NSTRLPBF	Infineon	55	49	17.5 @ 25A, 10V	4 @ 250µA	63 @ 10V	1470 @ 25V	3.8 (Ta), 94 (Tc)	D2PAK	Active
IRFZ44SPBF	Vishay Siliconix	60	50	28 @ 31A, 10V	4 @ 250µA	67 @ 10V	1900 @ 25V	3.7 (Ta), 150 (Tc)	D2PAK	Active
IRFZ44STRLPBF	Vishay Siliconix	60	50	28 @ 31A, 10V	4 @ 250µA	67 @ 10V	1900 @ 25V	3.7 (Ta), 150 (Tc)	D2PAK	Active
STB55NF06LT4	STMicroelectronics	60	55	18 @ 27.5A, 10V	4.7 @ 250µA	37 @ 4.5V	1700 @ 25V	95 (Tc)	D2PAK	Active
STB55NF06T4	STMicroelectronics	60	50	18 @ 27.5A, 10V	4 @ 250µA	60 @ 10V	1300 @ 25V	110 (Tc)	D2PAK	Active
PSMN015-60BS,118	Nexperia USA Inc.	60	50	14.8 @ 15A, 10V	4 @ 1mA	20.9 @ 10V	1220 @ 30V	86 (Tc)	D2PAK	Active
IPB50N10S3L16ATMA1	Infineon	100	50	15.4 @ 50A, 10V	2.4 @ 60µA	64 @ 10V	4180 @ 25V	100 (Tc)	D2PAK	Active

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement):

IRFZ44NSTRLPBF is the direct parametric equivalent to IRFZ44NSTRRPBF. Both parts share identical electrical specifications (55V, 49A, 17.5mOhm Rds On) and D2PAK packaging. The primary difference is packaging format: IRFZ44NSTRLPBF is supplied in Tape & Reel (TR) format and maintains Active product status, making it the preferred direct replacement for discontinued IRFZ44NSTRRPBF applications.

Manufacturer Recommended Substitutes (Enhanced Specifications):

IRFZ44SPBF and IRFZ44STRLPBF (Vishay Siliconix) provide 60V voltage rating and 50A current capability with improved thermal performance (150W Tc). These are suitable for applications requiring higher voltage margin or increased current headroom while maintaining similar on-resistance characteristics.

STB55NF06LT4 and STB55NF06T4 (STMicroelectronics) offer 60V rating with 55A and 50A current ratings respectively, featuring lower gate charge (37-60nC) and reduced input capacitance, beneficial for high-frequency switching applications.

PSMN015-60BS,118 (Nexperia USA Inc.) delivers 60V, 50A with superior on-resistance (14.8mOhm @ 15A, 10V) and minimal gate charge (20.9nC), optimizing for low-loss applications.

IPB50N10S3L16ATMA1 (Infineon OptiMOS™) provides 100V rating with 50A capability and 15.4mOhm on-resistance, suitable for applications requiring higher voltage headroom or enhanced reliability margins.

Compliance Verification:

All substitute parts maintain RoHS3 compliance and REACH unaffected status, meeting regulatory requirements equivalent to the original IRFZ44NSTRRPBF. Moisture Sensitivity Level (MSL) 1 (Unlimited) is consistent across all options.

Frequently Asked Questions (FAQ)

Q: Can IRFZ44NSTRLPBF directly replace IRFZ44NSTRRPBF in existing designs?

A: Yes. IRFZ44NSTRLPBF is a parametric equivalent with identical electrical specifications and D2PAK packaging. The only difference is the packaging format (Tape & Reel vs. standard reel). No circuit modifications are required.

Q: What is the primary advantage of using STB55NF06LT4 or STB55NF06T4 over the IRFZ44 series?

A: STMicroelectronics STripFET™ II devices offer lower gate charge (37-60nC vs. 63nC) and reduced input capacitance, resulting in faster switching transitions and lower gate drive power requirements. The 60V rating provides additional voltage margin over the 55V IRFZ44NSTRRPBF.

Q: Is PSMN015-60BS,118 suitable for high-efficiency applications?

A: Yes. PSMN015-60BS,118 features the lowest on-resistance (14.8mOhm @ 15A, 10V) and minimal gate charge (20.9nC) among the 60V substitutes, making it optimal for applications prioritizing efficiency and reduced power dissipation.

Q: When should IPB50N10S3L16ATMA1 be selected instead of lower-voltage alternatives?

A: IPB50N10S3L16ATMA1 should be selected when circuit design requires 100V voltage rating for enhanced reliability margins, higher transient voltage protection, or when operating in environments with potential voltage spikes exceeding 55V.

Q: Are all substitute parts available in the same D2PAK package?

A: Yes. All substitute parts listed use TO-263-3 (D2PAK) surface mount packaging with 2 leads plus tab configuration, ensuring PCB layout compatibility with the original IRFZ44NSTRRPBF design.

Q: What is the temperature operating range consistency across substitutes?

A: All substitute parts maintain the -55°C to 175°C (TJ) operating temperature range, ensuring thermal performance equivalence to the original IRFZ44NSTRRPBF across the full design envelope.

Q: Do packaging format differences (Tube vs. Tape & Reel) affect electrical performance?

A: No. Packaging format differences (Tube, Cut Tape, Tape & Reel) do not affect electrical performance or functionality. Selection should be based on manufacturing process requirements and inventory management practices.

Q: Which substitute offers the best balance of performance and availability?

A: IRFZ44NSTRLPBF provides direct parametric equivalence with Active product status and high inventory availability (21,134 pcs), making it the optimal choice for immediate replacement requirements without design modifications.

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