IRFP450 N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The IRFP450 is an N-Channel 500V 14A through-hole MOSFET manufactured by IXYS in TO-247AD packaging. This device is rated for 190W power dissipation and operates across a temperature range of -55°C to 150°C. The IRFP450 is classified as obsolete, making identification of equivalent and substitute parts essential for design continuity and procurement planning. Substitute parts must maintain electrical compatibility across drain-source voltage, continuous drain current, on-resistance characteristics, and thermal performance parameters while accommodating available packaging options.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the IRFP450 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-Source Voltage (Vdss): Must equal or exceed 500V
Continuous Drain Current (Id): Must equal or exceed 14A at 25°C
On-Resistance (Rds On): Must not exceed 400mOhm at rated current and gate voltage
Gate Threshold Voltage (Vgs(th)): Must fall within acceptable switching range (3.5V to 4.5V)
Power Dissipation: Must equal or exceed 190W at case temperature
Operating Temperature: Must span -55°C to 150°C
Package: TO-247-3 form factor with through-hole mounting

Substitution Logic: Parts are grouped into two categories based on electrical performance relative to the IRFP450:

Direct Equivalents: Parts matching all key electrical parameters (Vdss, Id, Rds On, power dissipation) with identical or superior performance characteristics and active product status.
Functional Alternatives: Parts with Vdss equal to or greater than 500V and Id equal to or greater than 14A, with Rds On values within acceptable operating margins, accommodating minor variations in gate charge and input capacitance that do not affect circuit functionality.

All substitute parts maintain TO-247-3 through-hole packaging and operate within the specified temperature range.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Qg @ 10V (nC)	Power Dissipation (W)	Product Status	RoHS Compliance
IRFP450	IXYS	500	14	400	150	190	Obsolete	—
IRFP450LCPBF	Vishay Siliconix	500	14	400	74	190	Active	ROHS3 Compliant
IRFP450APBF	Vishay Siliconix	500	14	400	64	190	Active	ROHS3 Compliant
IRFP450PBF	Infineon Technologies	500	14	400	150	190	Obsolete	ROHS3 Compliant
IRFP448PBF	Vishay Siliconix	500	11	600	84	180	Active	ROHS3 Compliant
STW14NK50Z	STMicroelectronics	500	14	380	92	150	Active	ROHS3 Compliant
IPW50R250CPFKSA1	Infineon Technologies	500	13	250	36	114	Active	ROHS3 Compliant
IPW50R140CPFKSA1	Infineon Technologies	550	23	140	64	192	Last Time Buy	ROHS3 Compliant

Engineering Selection Recommendations

Recommended Direct Substitutes (Highest Compatibility):

IRFP450LCPBF and IRFP450APBF (Vishay Siliconix) are the primary recommended substitutes. Both parts are manufactured by Vishay Siliconix and maintain identical electrical specifications to the IRFP450 (500V, 14A, 400mOhm Rds On, 190W power dissipation). Both are ROHS3 compliant and carry active product status, ensuring long-term availability. IRFP450APBF offers reduced gate charge (64nC versus 150nC), resulting in faster switching characteristics. IRFP450LCPBF provides intermediate gate charge (74nC) with equivalent performance. Both are supplied in TO-247AC packaging, compatible with TO-247-3 footprints.

Alternative Substitutes (Functional Equivalence):

STW14NK50Z (STMicroelectronics) maintains 500V, 14A ratings with superior on-resistance (380mOhm), reducing conduction losses. This part is ROHS3 compliant and carries active product status. Power dissipation is rated at 150W, which is lower than the IRFP450 but remains adequate for most applications within the 14A continuous current specification.

IPW50R140CPFKSA1 (Infineon Technologies CoolMOS™ series) provides enhanced performance with 550V rating, 23A continuous current, and significantly lower on-resistance (140mOhm). This part exceeds IRFP450 specifications across all critical parameters and is ROHS3 compliant. Product status is Last Time Buy, indicating limited future availability.

Secondary Alternatives (Reduced Current Rating):

IRFP448PBF (Vishay Siliconix) is rated for 500V and 11A continuous current, below the IRFP450's 14A specification. On-resistance is higher at 600mOhm. This part is suitable only for applications where continuous drain current does not exceed 11A. ROHS3 compliant and active product status.

IPW50R250CPFKSA1 (Infineon Technologies CoolMOS™ series) is rated for 500V and 13A continuous current, marginally below the IRFP450's 14A specification. On-resistance is superior at 250mOhm. Power dissipation is rated at 114W, significantly lower than the IRFP450. This part is suitable for applications where continuous current remains below 13A. ROHS3 compliant and active product status.

Compliance and Regulatory Status:

All recommended substitutes carry ROHS3 compliance and REACH Unaffected status, matching the regulatory profile of the original IRFP450. All parts are classified under ECCN EAR99 and HTSUS 8541.29.0095.

Frequently Asked Questions (FAQ)

Q: Can IRFP450LCPBF and IRFP450APBF be used interchangeably with the IRFP450?

A: Yes. Both parts maintain identical voltage (500V), current (14A), and on-resistance (400mOhm) specifications. The primary difference is gate charge: IRFP450APBF (64nC) and IRFP450LCPBF (74nC) versus IRFP450 (150nC). Lower gate charge results in faster switching transitions. Both are ROHS3 compliant and carry active product status, ensuring procurement availability.

Q: What is the difference between TO-247AC and TO-247AD packaging?

A: TO-247AC and TO-247AD are both three-lead through-hole packages with identical pin configurations and footprints. The designations reflect internal manufacturing variations. Parts specified as TO-247AC or TO-247-3 are mechanically and electrically compatible with TO-247AD applications.

Q: Is STW14NK50Z suitable as a direct replacement?

A: STW14NK50Z maintains 500V and 14A specifications with superior on-resistance (380mOhm versus 400mOhm). Power dissipation is rated at 150W, lower than the IRFP450's 190W. This part is suitable for applications where thermal margins are adequate. The lower power dissipation rating does not prevent substitution if circuit design does not approach maximum power levels.

Q: Why do IPW50R140CPFKSA1 and IPW50R250CPFKSA1 have significantly lower on-resistance values?

A: These parts utilize Infineon's CoolMOS™ technology, which employs advanced semiconductor design to reduce on-resistance while maintaining voltage ratings. IPW50R140CPFKSA1 (140mOhm) and IPW50R250CPFKSA1 (250mOhm) represent performance improvements over the IRFP450 (400mOhm). Lower on-resistance reduces conduction losses and heat generation.

Q: Can IRFP448PBF be used in applications requiring 14A continuous current?

A: No. IRFP448PBF is rated for 11A continuous drain current, below the IRFP450's 14A specification. Use of this part in 14A applications exceeds its rated current capacity and risks device failure. IRFP448PBF is suitable only for applications where continuous current does not exceed 11A.

Q: What is the significance of "Last Time Buy" product status for IPW50R140CPFKSA1?

A: Last Time Buy status indicates that the manufacturer has announced end-of-life for this part. Existing inventory is available for purchase, but production will cease. For long-term design continuity, IRFP450LCPBF or IRFP450APBF are preferred due to active product status and guaranteed future availability.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts carry ROHS3 compliance certification, matching the regulatory requirements of the original IRFP450. All parts are also REACH Unaffected and classified under ECCN EAR99.

Q: How does gate charge affect circuit performance?

A: Gate charge (Qg) determines the energy required to switch the MOSFET on and off. Lower gate charge (IRFP450APBF at 64nC) results in faster switching transitions and reduced driver power consumption compared to higher gate charge (IRFP450 at 150nC). Circuit design must account for driver capability to supply the required gate charge within specified switching times.

Q: Can IPW50R250CPFKSA1 be used in applications requiring 14A continuous current?

A: IPW50R250CPFKSA1 is rated for 13A continuous drain current, marginally below the IRFP450's 14A specification. Use in 14A applications approaches the device's rated limit. This part is suitable only for applications where continuous current remains below 13A or where brief excursions above 13A are acceptable within thermal constraints.

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