IRFZ48ZS N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The IRFZ48ZS is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 55V drain-to-source voltage and 61A continuous drain current in a D2PAK surface mount package. This device is classified as obsolete, necessitating identification of active alternative components with equivalent or superior electrical characteristics for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	55	V
Continuous Drain Current (Id) @ 25°C	61	A
On-State Resistance (Rds On) @ 37A, 10V	11	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	64	nC
Power Dissipation (Max)	91	W
Operating Temperature Range	-55 to 175	°C
Package Type	D2PAK (TO-263-3)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the IRFZ48ZS is determined by the following critical parameters:

Voltage Rating Compatibility: Substitute parts must have Vdss ≥ 55V to maintain voltage margin in the application circuit.

Current Capacity: Substitute parts must have Id ≥ 61A at 25°C to support the original current requirements.

On-State Resistance: Lower Rds On values reduce power dissipation and heat generation, improving thermal performance.

Package Compatibility: All substitutes must use D2PAK (TO-263-3) surface mount packaging to ensure mechanical and thermal interface compatibility.

Gate Charge: Lower gate charge reduces driver power requirements and switching losses.

Temperature Range: Operating temperature range must span -55°C to 175°C minimum.

Substitute parts are grouped into three categories based on voltage rating and current capacity alignment with the IRFZ48ZS specifications.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Qg (nC)	Power Dissipation (W)	Status	RoHS
IRFZ48ZS	Infineon	55	61	11 @ 37A, 10V	64 @ 10V	91	Obsolete	Non-compliant
BUK9612-55B,118	Nexperia	55	75	10 @ 25A, 10V	31 @ 5V	157	Active	ROHS3
HUF75545S3ST	onsemi	80	75	10 @ 75A, 10V	235 @ 20V	270	Active	ROHS3
PSMN7R6-60BS,118	Nexperia	60	92	7.8 @ 25A, 10V	38.7 @ 10V	149	Active	ROHS3
STB60NF06T4	STMicroelectronics	60	60	16 @ 30A, 10V	66 @ 10V	110	Active	ROHS3
STB55NF06T4	STMicroelectronics	60	50	18 @ 27.5A, 10V	60 @ 10V	110	Active	ROHS3
IPB090N06N3GATMA1	Infineon	60	50	9 @ 50A, 10V	36 @ 10V	71	Active	ROHS3
IRFZ48RSPBF	Vishay Siliconix	60	50	18 @ 43A, 10V	110 @ 10V	190	Active	ROHS3
PSMN015-60BS,118	Nexperia	60	50	14.8 @ 15A, 10V	20.9 @ 10V	86	Active	ROHS3
IPB50N10S3L16ATMA1	Infineon	100	50	15.4 @ 50A, 10V	64 @ 10V	100	Active	ROHS3
BUK7610-55AL,118	Nexperia	55	75	10 @ 25A, 10V	124 @ 10V	300	Obsolete	ROHS3

Engineering Selection Recommendations

Primary Substitute - Matched Voltage Rating (55V):

BUK9612-55B,118 (Nexperia) is the preferred substitute for direct replacement. This part maintains the 55V voltage rating, exceeds the 61A current requirement with 75A capability, and delivers superior on-state resistance (10 mOhm vs. 11 mOhm). The device is active in production, RoHS3 compliant, and AEC-Q101 qualified for automotive applications. Gate charge is significantly reduced (31 nC @ 5V), lowering driver power requirements.

Secondary Substitutes - Elevated Voltage Rating (60V):

PSMN7R6-60BS,118 (Nexperia) provides the highest current capacity at 92A with the lowest on-state resistance (7.8 mOhm @ 25A, 10V). The 60V rating provides additional voltage margin. This device is active and RoHS3 compliant.

STB60NF06T4 (STMicroelectronics) matches the original current specification at 60A with 60V rating. On-state resistance is 16 mOhm, higher than the original but acceptable for applications with moderate thermal constraints. Active status and RoHS3 compliance are confirmed.

IPB090N06N3GATMA1 (Infineon) offers reduced on-state resistance (9 mOhm @ 50A, 10V) and lower power dissipation (71W) compared to the original. Current capacity is 50A, which is below the original 61A specification and requires application review.

Tertiary Substitute - Elevated Voltage Rating (100V):

IPB50N10S3L16ATMA1 (Infineon) provides 100V voltage rating with 50A current capacity. This part is suitable only for applications where higher voltage margin is required and current demand does not exceed 50A. On-state resistance is 15.4 mOhm.

Compliance Status:

All recommended active substitutes are RoHS3 compliant. The original IRFZ48ZS is RoHS non-compliant and obsolete. BUK9612-55B,118 and BUK7610-55AL,118 carry AEC-Q101 automotive qualification.

Frequently Asked Questions (FAQ)

Q: Can BUK9612-55B,118 directly replace IRFZ48ZS in existing PCB layouts?

A: Yes. Both devices use D2PAK (TO-263-3) surface mount packaging with identical pin configuration and thermal interface. No PCB modification is required.

Q: What is the significance of the lower gate charge in BUK9612-55B,118?

A: Gate charge of 31 nC at 5V drive voltage, compared to 64 nC at 10V for IRFZ48ZS, reduces the energy required by the gate driver circuit. This lowers switching losses and improves overall system efficiency.

Q: Is PSMN7R6-60BS,118 suitable if my application requires exactly 61A continuous current?

A: PSMN7R6-60BS,118 is rated for 92A continuous drain current, which exceeds the 61A requirement. The 60V voltage rating provides additional margin above the 55V specification. This part is suitable for the application.

Q: Why does IPB090N06N3GATMA1 show lower power dissipation than the original?

A: Power dissipation is determined by on-state resistance and current. IPB090N06N3GATMA1 has 9 mOhm resistance versus 11 mOhm for IRFZ48ZS. At equivalent current levels, lower resistance produces lower power dissipation. However, this part is rated for 50A maximum, below the original 61A specification.

Q: What is the thermal advantage of BUK7610-55AL,118 despite its obsolete status?

A: BUK7610-55AL,118 has the highest power dissipation rating at 300W, indicating superior thermal performance. However, this part is obsolete and should not be selected for new designs. BUK9612-55B,118 is the active alternative from the same manufacturer.

Q: Can I use IPB50N10S3L16ATMA1 in a 55V application?

A: Yes. The 100V voltage rating is compatible with 55V applications and provides additional voltage margin. However, the 50A current rating is below the original 61A specification. Application current requirements must be verified before selection.

Q: Are all recommended substitutes available in the same packaging options as IRFZ48ZS?

A: All recommended substitutes use D2PAK (TO-263-3) surface mount packaging. Packaging options (Tape & Reel, Cut Tape, Tube) vary by part number and supplier. Verify packaging availability with your component distributor.

Q: What is the operating temperature range compatibility?

A: IRFZ48ZS operates from -55°C to 175°C. All recommended substitutes maintain this temperature range or exceed it. STB60NF06T4 extends the lower limit to -65°C, providing additional margin.

Q: Does RoHS3 compliance affect electrical performance?

A: RoHS3 compliance indicates lead-free construction and does not alter electrical performance. All active substitutes are RoHS3 compliant, meeting current regulatory requirements for new designs.

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