IXFH18N60X Equivalent & Substitute Parts

Part Overview

The IXFH18N60X is an N-Channel 600V 18A MOSFET in TO-247 package manufactured by IXYS. This device is part of the HiPerFET™ Ultra X series and is classified as obsolete. The part delivers 320W maximum power dissipation and operates across a temperature range of -55°C to 150°C. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	600	V
Continuous Drain Current (Id) @ 25°C	18	A
Rds On (Max) @ 9A, 10V	230	mOhm
Gate Charge (Qg) @ 10V	35	nC
Input Capacitance (Ciss) @ 25V	1440	pF
Power Dissipation (Max)	320	W
Operating Temperature Range	-55 to 150	°C
Package Type	TO-247-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the IXFH18N60X is determined by the following critical parameters:

Primary Substitution Criteria:

Drain to Source Voltage (Vdss): 600V minimum
Continuous Drain Current (Id): 18A minimum
Package Type: TO-247-3 (Through Hole)
Operating Temperature Range: -55°C to 150°C minimum

Secondary Compatibility Factors:

On-resistance (Rds On): Lower or equal values ensure equivalent or improved performance
Gate Charge (Qg): Lower values reduce switching losses
Input Capacitance (Ciss): Affects gate drive requirements
Power Dissipation: Higher ratings provide design margin

Parts are grouped into two categories:

Category 1: Direct IXYS Manufacturer Equivalent The IXFH18N65X2 is the manufacturer-recommended successor from IXYS, offering improved specifications within the same product family while maintaining TO-247 packaging and through-hole mounting.

Category 2: Cross-Manufacturer Alternatives Vishay Siliconix, STMicroelectronics, and Infineon parts meet or exceed the electrical specifications of the IXFH18N60X. These parts are selected based on matching or exceeding Vdss, Id, and thermal performance while maintaining TO-247-3 package compatibility.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Qg (nC)	Ciss (pF)	Pmax (W)	Status	Package
IXFH18N60X	IXYS	600	18	230 @ 9A	35 @ 10V	1440 @ 25V	320	Obsolete	TO-247-3
IXFH18N65X2	IXYS	650	18	200 @ 9A	29 @ 10V	1520 @ 25V	290	Active	TO-247-3
IRFP22N60KPBF	Vishay Siliconix	600	22	280 @ 13A	150 @ 10V	3570 @ 25V	370	Active	TO-247-3
IRFP26N60LPBF	Vishay Siliconix	600	26	250 @ 16A	180 @ 10V	5020 @ 25V	470	Active	TO-247-3
IRFP27N60KPBF	Vishay Siliconix	600	27	220 @ 16A	180 @ 10V	4660 @ 25V	500	Active	TO-247-3
SIHG15N60E-GE3	Vishay Siliconix	600	15	280 @ 8A	78 @ 10V	1350 @ 100V	180	Active	TO-247-3
SIHG17N80E-GE3	Vishay Siliconix	800	15	290 @ 8.5A	122 @ 10V	2408 @ 100V	208	Active	TO-247-3
SPW17N80C3FKSA1	Infineon Technologies	800	17	290 @ 11A	177 @ 10V	2320 @ 25V	227	Active	TO-247-3
STW18N60M2	STMicroelectronics	600	13	280 @ 6.5A	21.5 @ 10V	791 @ 100V	110	Active	TO-247-3
STW18N65M5	STMicroelectronics	650	15	220 @ 7.5A	31 @ 10V	1240 @ 100V	110	Active	TO-247-3

Engineering Selection Recommendations

Recommended Primary Substitute: IXFH18N65X2

The IXFH18N65X2 is the manufacturer-recommended equivalent from IXYS. This part maintains the same drain current rating (18A) and package format (TO-247-3) while offering improved on-resistance (200 mOhm vs. 230 mOhm) and reduced gate charge (29 nC vs. 35 nC). The part is in active production status with ROHS3 compliance and REACH unaffected designation. Higher Vdss rating (650V vs. 600V) provides additional voltage margin for circuit protection.

Alternative Substitutes Based on Application Requirements:

For applications requiring exact 600V voltage rating and higher current capability:

IRFP26N60LPBF (Vishay Siliconix): 26A continuous current, 250 mOhm Rds On, 470W power dissipation. Active status with ROHS3 compliance and REACH unaffected. Highest inventory availability (25,400 pcs).
IRFP27N60KPBF (Vishay Siliconix): 27A continuous current, 220 mOhm Rds On, 500W power dissipation. Active status with ROHS3 compliance and REACH unaffected. High inventory availability (16,963 pcs).

For applications with 600V requirement and lower current demand:

STW18N60M2 (STMicroelectronics): 13A continuous current, 280 mOhm Rds On, 110W power dissipation. Active status with ROHS3 compliance and REACH unaffected. Lower power dissipation suitable for reduced thermal load applications.

For applications tolerating higher voltage ratings (650V or 800V):

STW18N65M5 (STMicroelectronics): 15A continuous current, 220 mOhm Rds On, 650V rating. Active status with ROHS3 compliance and REACH unaffected.
SIHG17N80E-GE3 (Vishay Siliconix): 15A continuous current, 290 mOhm Rds On, 800V rating. Active status with ROHS3 compliance. Suitable for high-voltage applications.
SPW17N80C3FKSA1 (Infineon Technologies): 17A continuous current, 290 mOhm Rds On, 800V rating. Active status with ROHS3 compliance and REACH unaffected. CoolMOS™ technology platform.

All recommended substitutes maintain TO-247-3 through-hole packaging and -55°C to 150°C operating temperature range compatibility with the original IXFH18N60X.

Frequently Asked Questions (FAQ)

Q: Can the IXFH18N65X2 directly replace the IXFH18N60X in existing designs?

A: Yes. The IXFH18N65X2 maintains identical drain current (18A), package type (TO-247-3), and operating temperature range (-55°C to 150°C). The higher voltage rating (650V vs. 600V) and improved on-resistance provide enhanced performance margins. Gate drive requirements are compatible due to similar gate charge characteristics (29 nC vs. 35 nC).

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

A: TO-247-3 is the standard three-terminal variant used for all listed parts. The IXFH18N60X specifies TO-247 (IXTH) which is equivalent to TO-247-3. All substitute parts use TO-247-3 through-hole mounting with identical pin configuration and thermal characteristics.

Q: Why do some substitute parts have higher current ratings than the original 18A specification?

A: Higher current-rated parts (IRFP22N60KPBF at 22A, IRFP26N60LPBF at 26A, IRFP27N60KPBF at 27A) provide design flexibility and thermal margin. These parts maintain 600V voltage rating and TO-247-3 packaging. The higher current capability does not require circuit modification if the original design operates below the substitute part's maximum rating.

Q: Are all substitute parts RoHS compliant?

A: All recommended substitute parts are ROHS3 compliant except IRFP27N60K, which is RoHS non-compliant. For applications requiring RoHS compliance, select from IXFH18N65X2, IRFP22N60KPBF, IRFP26N60LPBF, IRFP27N60KPBF, SIHG15N60E-GE3, SIHG17N80E-GE3, SPW17N80C3FKSA1, STW18N60M2, or STW18N65M5.

Q: What is the impact of different on-resistance (Rds On) values on circuit performance?

A: Lower Rds On values reduce conduction losses and heat generation. The IXFH18N65X2 (200 mOhm) and STW18N65M5 (220 mOhm) offer improved efficiency compared to the original IXFH18N60X (230 mOhm). Higher Rds On values in some alternatives (IRFP22N60KPBF at 280 mOhm, SIHG15N60E-GE3 at 280 mOhm) result in increased power dissipation but remain within acceptable ranges for most applications.

Q: How does gate charge (Qg) affect gate driver selection?

A: Gate charge determines the energy required to switch the MOSFET. Lower Qg values reduce switching losses and allow faster switching speeds. The IXFH18N65X2 (29 nC) and STW18N60M2 (21.5 nC) require less gate drive energy than the original IXFH18N60X (35 nC). Higher Qg values in some alternatives (IRFP26N60LPBF at 180 nC, SPW17N80C3FKSA1 at 177 nC) require proportionally higher gate drive capability but are compatible with standard gate driver circuits.

Q: Can parts with 800V ratings be used in 600V applications?

A: Yes. Parts rated for 800V (SIHG17N80E-GE3, SPW17N80C3FKSA1) operate safely in 600V applications. The higher voltage rating provides additional safety margin and does not affect circuit functionality. However, these parts typically exhibit higher on-resistance and gate charge due to the higher voltage rating, resulting in increased switching losses compared to 600V-rated alternatives.

Q: What inventory considerations apply to these substitute parts?

A: Inventory availability varies significantly. IRFP26N60LPBF has the highest availability (25,400 pcs), followed by IRFP27N60KPBF (16,963 pcs) and SPW17N80C3FKSA1 (9,900 pcs). The IXFH18N65X2 has 867 pcs available. For long-term production requirements, verify current inventory status with suppliers before design finalization.

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