IRFZ34NS N-Channel MOSFET 55V 29A Equivalent & Substitute Parts

Part Overview

The IRFZ34NS is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 55V drain-to-source voltage with 29A continuous drain current in a D2PAK surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The IRFZ34NS operates across a wide temperature range from -55°C to 175°C and is suitable for switching applications requiring moderate current handling in compact surface mount form factors.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	55	V
Continuous Drain Current (Id) @ 25°C	29	A (Tc)
Rds On (Max) @ Id, Vgs	40	mOhm @ 16A, 10V
Gate Threshold Voltage Vgs(th) (Max) @ Id	4	V @ 250µA
Gate Charge (Qg) (Max) @ Vgs	34	nC @ 10V
Input Capacitance (Ciss) (Max) @ Vds	700	pF @ 25V
Power Dissipation (Max)	3.8 (Ta), 68 (Tc)	W
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	D2PAK (TO-263-3)	—
Mounting Type	Surface Mount	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the IRFZ34NS is determined by strict electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Drain-to-Source Voltage (Vdss) must equal or exceed 55V
Continuous Drain Current (Id) must equal or exceed 29A
Gate Threshold Voltage (Vgs(th)) must be compatible with 4V @ 250µA specification
Maximum Gate Voltage (Vgs) must support ±20V operation
Operating temperature range must span -55°C to 175°C

Mechanical Compatibility Criteria:

Package type must be D2PAK (TO-263-3) surface mount
Pin configuration must match 2 Leads + Tab standard

Identified Substitute Parts:

BUK7635-55A,118 (Nexperia USA Inc.) — Meets all electrical parameters with improved current rating (35A) and lower on-resistance (35mOhm). Maintains identical Vdss (55V) and package (D2PAK). Includes automotive qualification (AEC-Q101) and RoHS3 compliance.
PSMN015-60BS,118 (Nexperia USA Inc.) — Exceeds electrical specifications with higher Vdss (60V) and significantly higher current rating (50A). Provides superior on-resistance performance (14.8mOhm). Maintains D2PAK package and active product status with RoHS3 compliance.

Parameter Comparison

Parameter	IRFZ34NS (Main)	BUK7635-55A,118	PSMN015-60BS,118	Unit
Manufacturer	Infineon Technologies	Nexperia USA Inc.	Nexperia USA Inc.	—
FET Type	N-Channel	N-Channel	N-Channel	—
Vdss	55	55	60	V
Id @ 25°C (Tc)	29	35	50	A
Rds On (Max)	40 @ 16A, 10V	35 @ 20A, 10V	14.8 @ 15A, 10V	mOhm
Vgs(th) (Max) @ Id	4 @ 250µA	4 @ 1mA	4 @ 1mA	V
Vgs (Max)	±20	±20	±20	V
Ciss (Max) @ Vds	700 @ 25V	872 @ 25V	1220 @ 30V	pF
Power Dissipation (Tc)	68	85	86	W
Operating Temperature	-55 to 175	-55 to 175	-55 to 175	°C (TJ)
Package	D2PAK (TO-263-3)	D2PAK (TO-263-3)	D2PAK (TO-263-3)	—
Mounting Type	Surface Mount	Surface Mount	Surface Mount	—
Product Status	Obsolete	Obsolete	Active	—
RoHS Status	Non-compliant	RoHS3 Compliant	RoHS3 Compliant	—
Automotive Qualification	—	AEC-Q101	—	—

Engineering Selection Recommendations

For Direct Replacement (Minimum Specification Match):

The BUK7635-55A,118 provides the closest electrical equivalence to the IRFZ34NS. Both devices maintain identical Vdss (55V) and comparable current ratings (35A vs. 29A). The BUK7635-55A,118 offers improved on-resistance performance and includes AEC-Q101 automotive qualification, making it suitable for applications requiring enhanced reliability. However, this part is also classified as obsolete.

For Long-Term Design Continuity (Active Product Status):

The PSMN015-60BS,118 is the recommended substitute for new designs and ongoing production. This device is in active product status, ensuring long-term availability and supply chain stability. It exceeds the IRFZ34NS specifications across all critical parameters: higher Vdss (60V), significantly higher current rating (50A), and superior on-resistance (14.8mOhm). The PSMN015-60BS,118 maintains D2PAK package compatibility and includes RoHS3 compliance.

Compliance Considerations:

Both substitute parts are RoHS3 compliant, addressing environmental and regulatory requirements that the obsolete IRFZ34NS does not meet. The BUK7635-55A,118 includes AEC-Q101 automotive qualification for applications requiring automotive-grade reliability standards.

Frequently Asked Questions (FAQ)

Q: Can the BUK7635-55A,118 directly replace the IRFZ34NS in existing designs?

A: Yes. The BUK7635-55A,118 maintains identical Vdss (55V) and D2PAK package configuration. The higher current rating (35A vs. 29A) and lower on-resistance (35mOhm vs. 40mOhm) provide improved performance margins. Gate threshold voltage and maximum gate voltage specifications are compatible. However, verify that the higher input capacitance (872pF vs. 700pF) does not impact gate drive circuit timing in your specific application.

Q: Why is the PSMN015-60BS,118 recommended over the BUK7635-55A,118?

A: The PSMN015-60BS,118 is in active product status, ensuring long-term availability and supply chain continuity. The BUK7635-55A,118 is also obsolete. Additionally, the PSMN015-60BS,118 provides superior electrical performance with higher current capacity (50A), lower on-resistance (14.8mOhm), and higher power dissipation capability (86W). These characteristics provide greater design margin and thermal performance.

Q: Are there any package compatibility concerns with these substitutes?

A: All three devices use the D2PAK (TO-263-3) package with identical pin configuration (2 Leads + Tab). PCB layout and thermal management considerations remain consistent. No package-related modifications are required for substitution.

Q: What is the impact of higher input capacitance in the substitute parts?

A: The BUK7635-55A,118 has 872pF input capacitance compared to 700pF in the IRFZ34NS. The PSMN015-60BS,118 has 1220pF. Higher input capacitance increases gate charge requirements and may extend switching times. Verify that your gate drive circuit can supply sufficient current to meet switching frequency requirements. For most standard switching applications, this difference is not critical.

Q: Do the substitute parts require different gate drive voltage?

A: No. All three devices operate with identical gate voltage specifications: Vgs(th) of 4V and maximum Vgs of ±20V. Gate drive circuits designed for the IRFZ34NS are directly compatible with both substitute parts.

Q: What are the thermal performance differences?

A: The IRFZ34NS is rated for 68W (Tc) power dissipation. The BUK7635-55A,118 provides 85W (Tc), and the PSMN015-60BS,118 provides 86W (Tc). The substitute parts offer improved thermal performance, allowing higher power handling or reduced thermal management requirements in the same package.

Q: Are there compliance or qualification differences?

A: The BUK7635-55A,118 includes AEC-Q101 automotive qualification, suitable for automotive applications. The PSMN015-60BS,118 does not carry automotive qualification but is RoHS3 compliant. Both substitute parts are RoHS3 compliant, while the original IRFZ34NS is RoHS non-compliant. Verify compliance requirements for your specific application.

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