IRF540ZS N-Channel 100V 36A MOSFET Equivalent & Substitute Parts

Part Overview

The IRF540ZS is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 100V drain-to-source voltage and 36A continuous drain current in a D2PAK surface mount package. This device is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and production continuity. The IRF540ZS operates across a temperature range of -55°C to 175°C and is suitable for applications requiring moderate to high current switching at 100V levels.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	100	V
Continuous Drain Current (Id) @ 25°C	36	A (Tc)
On-State Resistance (Rds On) @ 22A, 10V	26.5	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	63	nC
Power Dissipation (Max)	92	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	D2PAK (TO-263-3)	Surface Mount
FET Type	N-Channel	—
Technology	MOSFET (Metal Oxide)	—

Substitute Part Grouping Explanation

Substitution of the IRF540ZS is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Drain-to-Source Voltage (Vdss): Must equal or exceed 100V
FET Type: N-Channel only
Technology: MOSFET (Metal Oxide)
Package: D2PAK (TO-263-3) surface mount
Operating Temperature Range: Must support -55°C to 175°C

Performance Parameters (Functional Equivalence):

Continuous Drain Current (Id): Minimum 36A at 25°C
On-State Resistance (Rds On): Lower or equal values indicate improved performance
Gate Charge (Qg): Lower values reduce switching losses
Power Dissipation: Higher ratings provide thermal margin

Substitute parts are grouped into two categories:

Category A – Direct Functional Equivalents: Parts meeting or exceeding all critical parameters with drain current ratings between 35A and 51A, maintaining D2PAK packaging and 100V Vdss rating.

Category B – Performance-Enhanced Alternatives: Parts exceeding the IRF540ZS specifications in drain current capacity, power dissipation, or on-state resistance characteristics while maintaining full electrical and mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Qg (nC)	Power Dissipation (W)	Product Status	Package
IRF540ZS	Infineon Technologies	100	36	26.5	63	92	Obsolete	D2PAK
STB30NF10T4	STMicroelectronics	100	35	45	55	115	Active	D2PAK
BUK7626-100B,118	Nexperia USA Inc.	100	49	26	38	157	Obsolete	D2PAK
BUK9629-100B,118	Nexperia USA Inc.	100	46	27	33	157	Active	D2PAK
HUF76639S3ST	onsemi	100	51	26	86	180	Active	D2PAK
IRF540SPBF	Vishay Siliconix	100	28	77	72	150	Active	D2PAK
IRF540STRLPBF	Vishay Siliconix	100	28	77	72	150	Active	D2PAK
IRF540STRRPBF	Vishay Siliconix	100	28	77	72	150	Active	D2PAK
PHB47NQ10T,118	Nexperia USA Inc.	100	47	28	66	166	Active	D2PAK
PSMN016-100BS,118	Nexperia USA Inc.	100	57	16	49	148	Active	D2PAK
PSMN034-100BS,118	Nexperia USA Inc.	100	32	34.5	23.8	86	Active	D2PAK

Engineering Selection Recommendations

Primary Recommendation – STB30NF10T4 (STMicroelectronics)

The STB30NF10T4 is an active product offering direct functional compatibility with the IRF540ZS. It maintains 100V Vdss and D2PAK packaging with 35A continuous drain current, meeting the minimum current requirement. The device features lower gate charge (55 nC vs. 63 nC), reducing switching losses. Enhanced power dissipation rating (115W vs. 92W) provides thermal margin. RoHS3 compliance and active product status ensure long-term availability and supply chain stability.

Secondary Recommendation – BUK9629-100B,118 (Nexperia USA Inc.)

The BUK9629-100B,118 is an active automotive-qualified device (AEC-Q101) with 46A drain current and superior on-state resistance (27 mOhm). Power dissipation reaches 157W, supporting high-current applications. Gate charge of 33 nC provides improved switching performance. RoHS3 compliance and active status support production continuity. Automotive qualification enables use in automotive and industrial applications requiring enhanced reliability.

Tertiary Recommendation – HUF76639S3ST (onsemi)

The HUF76639S3ST is an active product with the highest drain current rating (51A) and lowest on-state resistance (26 mOhm) among available substitutes. Power dissipation of 180W accommodates demanding thermal environments. The UltraFET™ series designation indicates advanced process technology. RoHS3 compliance and active status ensure availability. This device is suitable for applications requiring maximum current capacity and thermal performance.

Alternative for Current-Limited Applications – PSMN034-100BS,118 (Nexperia USA Inc.)

The PSMN034-100BS,118 is an active product rated for 32A continuous drain current, closely matching the IRF540ZS specification. On-state resistance of 34.5 mOhm and gate charge of 23.8 nC provide efficient switching characteristics. Power dissipation of 86W matches the original device. This part is suitable for applications where current requirements do not exceed 32A and where cost optimization is a consideration.

Not Recommended – IRF540SPBF, IRF540STRLPBF, IRF540STRRPBF (Vishay Siliconix)

These Vishay Siliconix variants are rated for only 28A continuous drain current, falling below the IRF540ZS specification of 36A. On-state resistance of 77 mOhm is significantly higher, resulting in increased power dissipation and heat generation. These devices are suitable only for applications with reduced current requirements below 28A.

Not Recommended – BUK7626-100B,118 (Nexperia USA Inc.)

Although this device offers superior electrical characteristics (49A, 26 mOhm), it is classified as obsolete, presenting the same supply chain risk as the original IRF540ZS. Active alternatives with comparable performance are available.

Frequently Asked Questions (FAQ)

Q: Can the IRF540ZS be directly replaced with any of these substitute parts?

A: Direct replacement is possible only with parts maintaining identical D2PAK packaging, 100V Vdss rating, and N-Channel MOSFET technology. Electrical performance varies across substitutes. Parts with drain current ratings of 35A or higher (STB30NF10T4, BUK9629-100B,118, HUF76639S3ST, PHB47NQ10T,118, PSMN016-100BS,118) provide full functional equivalence. Parts rated below 36A (IRF540SPBF variants, PSMN034-100BS,118) require application-specific evaluation.

Q: What is the significance of the D2PAK package specification?

A: The D2PAK (TO-263-3) package is a surface mount configuration with two leads plus a thermal tab. All substitute parts listed maintain this identical package, ensuring PCB layout compatibility without redesign. Package dimensions, pin spacing, and thermal characteristics remain consistent across all listed alternatives.

Q: Why is the IRF540ZS classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production and no longer supports the device. This creates supply chain risk for new production runs. Active alternatives ensure continued availability and manufacturer support for technical documentation and quality assurance.

Q: How do on-state resistance (Rds On) differences affect circuit performance?

A: On-state resistance determines conduction losses during the transistor's on-state. Lower Rds On values reduce power dissipation and heat generation. The IRF540ZS specifies 26.5 mOhm at 22A, 10V. Substitutes with lower Rds On (BUK9629-100B,118 at 27 mOhm, HUF76639S3ST at 26 mOhm, PSMN016-100BS,118 at 16 mOhm) improve efficiency. Higher Rds On values (STB30NF10T4 at 45 mOhm, IRF540SPBF at 77 mOhm) increase losses and require thermal management evaluation.

Q: What role does gate charge (Qg) play in substitution decisions?

A: Gate charge determines the energy required to switch the transistor on and off. Lower gate charge reduces switching losses and enables faster switching speeds. The IRF540ZS specifies 63 nC at 10V. Substitutes with lower gate charge (BUK9629-100B,118 at 33 nC, PSMN034-100BS,118 at 23.8 nC) improve switching efficiency. Higher gate charge values (HUF76639S3ST at 86 nC) may increase switching losses but do not prevent functional substitution.

Q: Are RoHS3 compliant parts required for all applications?

A: RoHS3 compliance is mandatory for products sold in the European Union and many other markets. The IRF540ZS is RoHS non-compliant. All active substitute parts listed (STB30NF10T4, BUK9629-100B,118, HUF76639S3ST, IRF540SPBF variants, PHB47NQ10T,118, PSMN016-100BS,118, PSMN034-100BS,118) are RoHS3 compliant, meeting current regulatory requirements.

Q: What is the significance of automotive qualification (AEC-Q101)?

A: AEC-Q101 qualification indicates the device meets automotive industry reliability and quality standards. BUK9629-100B,118 and BUK7626-100B,118 carry this qualification, making them suitable for automotive and mission-critical applications. Non-qualified devices are suitable for industrial and consumer applications where automotive standards are not required.

Q: Can I use a substitute with higher drain current rating than the IRF540ZS?

A: Yes. Substitutes with higher drain current ratings (BUK9629-100B,118 at 46A, HUF76639S3ST at 51A, PHB47NQ10T,118 at 47A, PSMN016-100BS,118 at 57A) provide additional current capacity and thermal margin. These devices are fully compatible and offer improved performance headroom for applications approaching the original 36A specification.

Q: What is the impact of power dissipation rating differences?

A: Power dissipation rating indicates the maximum heat the device can safely dissipate. The IRF540ZS specifies 92W. Substitutes with higher ratings (STB30NF10T4 at 115W, BUK9629-100B,118 at 157W, HUF76639S3ST at 180W) accommodate higher current or switching frequency applications without thermal stress. Lower ratings (PSMN034-100BS,118 at 86W) require thermal management evaluation for high-power applications.

Q: Are there any supply chain considerations for substitute selection?

A: Active product status ensures continued manufacturing and availability. STB30NF10T4, BUK9629-100B,118, HUF76639S3ST, and Nexperia PSMN series devices are all active products with established supply chains. Obsolete devices (BUK7626-100B,118) present the same supply risk as the original IRF540ZS and should be avoided for new designs.

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