IRFP450 Equivalent & Substitute Parts

Part Overview

The IRFP450 is an N-Channel 500V 14A MOSFET manufactured by Vishay Siliconix in a TO-247-3 through-hole package. This device is classified as obsolete product status. The IRFP450 delivers 190W maximum power dissipation and operates across a temperature range of -55°C to 150°C. Due to its obsolete classification, equivalent and substitute parts with active product status or improved specifications are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	500	V
Continuous Drain Current (Id) @ 25°C	14	A
On-State Resistance (Rds On) @ 8.4A, 10V	400	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	150	nC
Maximum Gate Voltage (Vgs)	±20	V
Input Capacitance (Ciss) @ 25V	2600	pF
Power Dissipation (Max)	190	W
Operating Temperature Range	-55 to 150	°C
Package Type	TO-247-3	Through Hole

Substitute Part Grouping Explanation

Substitute parts for the IRFP450 are selected based on the following critical parameters:

Voltage Rating: All substitutes maintain the 500V Vdss specification, ensuring compatibility in high-voltage switching applications.

Current Rating: Substitutes range from 14A to 24A continuous drain current. Parts with equal or higher current ratings (14A minimum) are electrically compatible for the IRFP450 application.

On-State Resistance (Rds On): Substitutes maintain Rds On values between 300mOhm and 400mOhm at specified gate voltages, ensuring comparable conduction losses.

Package Type: All substitutes use TO-247 package variants (TO-247-3, TO-247AC, TO-247AD), maintaining mechanical and thermal compatibility with through-hole mounting.

Operating Temperature: All substitutes operate across the -55°C to 150°C range, matching the IRFP450 thermal specification.

Gate Voltage Rating: Substitutes support gate voltage ratings of ±20V to ±30V, all compatible with the IRFP450's ±20V maximum specification.

Parameter Comparison

Parameter	IRFP450	IRFP450PBF	IXFH16N50P	IXTH20N50D	IXTH24N50L	STW14NK50Z
Manufacturer	Vishay Siliconix	Infineon Technologies	IXYS	IXYS	IXYS	STMicroelectronics
Vdss (V)	500	500	500	500	500	500
Id @ 25°C (A)	14	14	16	20	24	14
Rds On (mOhm)	400 @ 8.4A, 10V	400 @ 8.4A, 10V	400 @ 8A, 10V	330 @ 10A, 10V	300 @ 500mA, 20V	380 @ 6A, 10V
Vgs(th) (V)	4 @ 250µA	4 @ 250µA	5.5 @ 2.5mA	Not specified	5 @ 250µA	4.5 @ 100µA
Qg @ 10V (nC)	150	150	43	125	160	92
Vgs Max (V)	±20	±20	±30	±30	±30	±30
Ciss @ 25V (pF)	2600	2600	2250	2500	2500	2000
Power Dissipation (W)	190	190	300	400	400	150
Operating Temperature (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package	TO-247-3	TO-247AC	TO-247AD	TO-247	TO-247	TO-247-3
Product Status	Obsolete	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Identical Specifications):

IRFP450PBF is a direct equivalent manufactured by Infineon Technologies. This part maintains identical electrical specifications to the IRFP450, including 500V Vdss, 14A continuous drain current, 400mOhm Rds On, and 190W power dissipation. IRFP450PBF is ROHS3 compliant, addressing regulatory requirements where the original IRFP450 is non-compliant. Both parts share obsolete product status.

Active Product Substitutes (Enhanced Specifications):

STW14NK50Z (STMicroelectronics) provides an active product alternative with matching 14A current rating and 500V voltage specification. This part features improved gate charge characteristics (92nC versus 150nC) and maintains TO-247-3 package compatibility. STW14NK50Z is ROHS3 compliant and carries active product status, ensuring long-term availability.

IXFH16N50P (IXYS) offers 16A continuous current with 500V Vdss in an active product status. This part delivers superior gate charge performance (43nC) and increased power dissipation capability (300W), providing design margin for thermal management. TO-247AD package maintains mechanical compatibility.

IXTH20N50D (IXYS) provides 20A continuous current with 500V Vdss and 400W power dissipation in active product status. This part features reduced Rds On (330mOhm) compared to the IRFP450, resulting in lower conduction losses.

IXTH24N50L (IXYS) delivers the highest current rating at 24A with 500V Vdss and 400W power dissipation. This part is suitable for applications requiring increased current capacity or thermal headroom. IXTH24N50L is available in high inventory volume (688,100 pieces).

All substitute parts maintain the -55°C to 150°C operating temperature range and are ROHS3 compliant, supporting modern regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can IRFP450PBF be used as a direct replacement for IRFP450?

A: Yes. IRFP450PBF maintains identical electrical and thermal specifications: 500V Vdss, 14A continuous drain current, 400mOhm Rds On, and 190W power dissipation. Both parts use TO-247-3 package. The primary difference is ROHS3 compliance status of IRFP450PBF versus non-compliance of the original IRFP450.

Q: What is the advantage of using STW14NK50Z over IRFP450?

A: STW14NK50Z provides active product status, ensuring continued availability and supply chain stability. Gate charge is reduced to 92nC compared to 150nC in the IRFP450, resulting in faster switching characteristics. Both parts maintain 14A current rating and 500V voltage specification with TO-247-3 package compatibility.

Q: When should IXFH16N50P be selected instead of STW14NK50Z?

A: IXFH16N50P is selected when increased current capacity or thermal margin is required. This part delivers 16A continuous current versus 14A, and 300W power dissipation versus 150W in STW14NK50Z. Gate charge is significantly lower at 43nC, enabling faster switching. Package is TO-247AD instead of TO-247-3.

Q: Are IXTH20N50D and IXTH24N50L compatible with IRFP450 applications?

A: Both parts are electrically compatible with IRFP450 applications. They maintain 500V Vdss and -55°C to 150°C operating temperature range. IXTH20N50D provides 20A current and IXTH24N50L provides 24A current, both exceeding the 14A IRFP450 specification. These parts are suitable for applications requiring higher current capacity or improved thermal performance. Package is TO-247 instead of TO-247-3.

Q: What is the difference between TO-247-3 and TO-247AC packages?

A: TO-247-3 and TO-247AC are mechanically compatible through-hole packages used for power MOSFETs. Both accommodate three leads (Gate, Drain, Source) with identical pin spacing and mounting hole patterns. Package designation differences reflect manufacturer conventions; electrical and thermal performance are equivalent.

Q: Why is product status important when selecting a substitute?

A: Product status indicates supply chain availability and manufacturer support. Obsolete parts (IRFP450, IRFP450PBF) have limited availability and no new production. Active products (STW14NK50Z, IXFH16N50P, IXTH20N50D, IXTH24N50L) are in current production with guaranteed long-term availability, supporting new designs and ongoing manufacturing requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (IRFP450PBF, IXFH16N50P, IXTH20N50D, IXTH24N50L, STW14NK50Z) are ROHS3 compliant. The original IRFP450 is non-compliant. ROHS3 compliance is required for applications subject to European Union Restriction of Hazardous Substances regulations.

Q: Can IXTH24N50L be used in place of IRFP450 in all applications?

A: IXTH24N50L is electrically compatible with IRFP450 for voltage and temperature specifications. The 24A current rating exceeds the 14A IRFP450 requirement, providing design margin. However, the 20V drive voltage specification for Rds On measurement differs from the IRFP450's 10V specification. Verify gate drive circuit compatibility before substitution.

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