IRF540 MOSFET N-Channel 100V 22A TO-220AB Equivalent & Substitute Parts

Part Overview

The IRF540 is an N-Channel MOSFET manufactured by STMicroelectronics, rated for 100V drain-to-source voltage and 22A continuous drain current in a TO-220 through-hole package. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The IRF540 operates across a temperature range of -55°C to 175°C and is suitable for switching applications requiring moderate current handling and voltage blocking capability.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	100	V
Continuous Drain Current (Id) @ 25°C	22	A
On-State Resistance (Rds On) @ 11A, 10V	77	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	41	nC
Power Dissipation (Max)	85	W
Operating Temperature Range	-55 to 175	°C
Package Type	TO-220-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the IRF540 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 100V
FET Type: Must be N-Channel
Technology: Must be MOSFET (Metal Oxide)
Package: Must be TO-220-3 through-hole configuration
Gate Threshold Voltage (Vgs(th)): Must be compatible at 4V nominal
Maximum Gate Voltage (Vgs Max): Must support ±20V

Secondary Compatibility Factors:

Continuous Drain Current (Id): Substitute parts with equal or higher current ratings maintain backward compatibility
On-State Resistance (Rds On): Lower resistance values indicate improved performance
Operating Temperature Range: Must support -55°C to 175°C minimum
Gate Charge (Qg): Affects switching speed and drive circuit requirements

The substitute parts listed below meet all primary criteria and maintain electrical compatibility with the IRF540 in standard switching applications.

Parameter Comparison

Parameter	IRF540 (STMicroelectronics)	IRF540NPBF (Infineon)	IRF540PBF (Vishay)	IRF540ZPBF (Infineon)	IXTP50N20P (IXYS)
Drain-to-Source Voltage (Vdss)	100V	100V	100V	100V	200V
Continuous Drain Current (Id) @ 25°C	22A	33A	28A	36A	50A
Rds On (Max) @ 10V	77 mOhm @ 11A	44 mOhm @ 16A	77 mOhm @ 17A	26.5 mOhm @ 22A	60 mOhm @ 50A
Gate Threshold Voltage (Vgs(th)) @ 250µA	4V	4V	4V	4V	5V
Gate Charge (Qg) @ 10V	41 nC	71 nC	72 nC	63 nC	70 nC
Input Capacitance (Ciss) @ 25V	870 pF	1960 pF	1700 pF	1770 pF	2720 pF
Power Dissipation (Max)	85W	130W	150W	92W	360W
Operating Temperature Range	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (100V Vdss Rating):

The IRF540NPBF, IRF540PBF, and IRF540ZPBF are direct electrical substitutes for the IRF540. All three devices maintain the 100V drain-to-source voltage rating and are available in the same TO-220-3 package. These parts are classified as active products with current manufacturing status, ensuring long-term availability and supply chain stability.

IRF540NPBF (Infineon Technologies) offers 33A continuous drain current with 44 mOhm on-state resistance and is ROHS3 compliant. This device provides improved current handling over the original IRF540 while maintaining compatible gate threshold voltage and operating temperature range.

IRF540PBF (Vishay Siliconix) provides 28A continuous drain current with 77 mOhm on-state resistance, matching the original device's resistance characteristics. This part is ROHS3 compliant and rated for 150W maximum power dissipation. REACH status is affected for this device.

IRF540ZPBF (Infineon Technologies) delivers the highest current rating at 36A with superior on-state resistance of 26.5 mOhm at 22A. This device is ROHS3 compliant and offers the lowest on-state resistance among the 100V-rated substitutes, resulting in reduced power dissipation and improved thermal performance.

Higher Voltage Alternative:

The IXTP50N20P (IXYS) is rated for 200V drain-to-source voltage with 50A continuous drain current. This device is suitable for applications requiring higher voltage blocking capability while maintaining the same TO-220-3 package. The 200V rating provides design margin for circuits operating near the 100V limit of the original IRF540. This part is ROHS3 compliant and REACH unaffected.

Compliance Considerations:

All substitute parts listed are ROHS3 compliant except the original IRF540, which is non-compliant. For new designs and production requiring regulatory compliance, IRF540NPBF, IRF540PBF, IRF540ZPBF, and IXTP50N20P are suitable replacements. The IRF540PBF carries REACH-affected status, while IRF540NPBF, IRF540ZPBF, and IXTP50N20P are REACH unaffected.

Frequently Asked Questions (FAQ)

Q: Can the IRF540NPBF directly replace the IRF540 in existing designs?

A: Yes. The IRF540NPBF maintains identical drain-to-source voltage (100V), gate threshold voltage (4V), and maximum gate voltage (±20V) specifications. The TO-220-3 package and through-hole mounting are identical. The higher continuous drain current (33A vs. 22A) and lower on-state resistance (44 mOhm vs. 77 mOhm) provide improved performance without requiring circuit modifications.

Q: What is the difference between IRF540ZPBF and IRF540NPBF?

A: Both devices are manufactured by Infineon and rated for 100V. The IRF540ZPBF offers superior on-state resistance (26.5 mOhm at 22A) compared to IRF540NPBF (44 mOhm at 16A), resulting in lower power dissipation and reduced heat generation. The IRF540ZPBF is suitable for applications where thermal performance is critical. Gate charge is lower in IRF540ZPBF (63 nC vs. 71 nC), indicating faster switching characteristics.

Q: Why is the IXTP50N20P listed as a substitute if it has 200V rating instead of 100V?

A: The IXTP50N20P is a higher-voltage alternative suitable for applications where the 100V rating of the IRF540 is marginal or where additional design margin is required. The 200V rating does not prevent its use in 100V circuits; it simply provides greater voltage headroom. The device maintains compatible gate threshold voltage (5V), operating temperature range (-55 to 175°C), and TO-220-3 package. Applications operating at or near 100V benefit from the additional voltage safety margin.

Q: Are there any gate drive circuit considerations when substituting these parts?

A: Gate charge (Qg) varies among substitutes. The original IRF540 has 41 nC gate charge, while substitutes range from 63 nC to 72 nC. Higher gate charge requires more drive current from the gate driver circuit. For most standard gate driver circuits rated for 100 nC or higher, this difference is not significant. Verify gate driver specifications if operating at maximum switching frequency or with marginal drive current capacity.

Q: What is the impact of different on-state resistance values?

A: On-state resistance (Rds On) directly affects power dissipation and heat generation. Lower Rds On values reduce I²R losses. The IRF540ZPBF (26.5 mOhm) dissipates significantly less heat than the original IRF540 (77 mOhm) at equivalent current levels. For applications with thermal constraints or high switching frequency, lower Rds On devices improve efficiency and reduce cooling requirements.

Q: Can these parts be used interchangeably in PCB designs?

A: Yes, all listed substitutes use the TO-220-3 package with identical pin configuration and through-hole mounting. PCB layouts designed for the IRF540 accommodate all substitute parts without modification. Thermal management considerations may differ due to varying power dissipation ratings; verify heatsink adequacy for the selected substitute.

Q: What is the significance of RoHS3 compliance?

A: RoHS3 compliance indicates the device meets Restriction of Hazardous Substances regulations, restricting lead, cadmium, mercury, and other hazardous materials. The original IRF540 is non-compliant. All listed substitutes are ROHS3 compliant, making them suitable for applications and markets requiring regulatory compliance. New designs should specify ROHS3-compliant devices.

Q: How do input capacitance differences affect circuit performance?

A: Input capacitance (Ciss) affects gate charge requirements and switching speed. The original IRF540 has 870 pF, while substitutes range from 1770 pF to 2720 pF. Higher input capacitance requires more gate charge and may slow switching transitions. For applications with fixed gate drive circuits, verify that the selected substitute's capacitance is compatible with existing drive timing and current capacity.

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