IXFP18N60X Equivalent & Substitute Parts

Part Overview

The IXFP18N60X is an N-Channel 600V 18A MOSFET manufactured by IXYS in the HiPerFET™ Ultra X series, housed in a TO-220-3 through-hole package. This device is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and production continuity. Substitute parts must maintain electrical compatibility across drain-source voltage, continuous drain current, on-resistance characteristics, and thermal performance parameters while accommodating the through-hole TO-220-3 mounting requirement.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	600	V
Continuous Drain Current (Id) @ 25°C	18	A
On-Resistance (Rds On) @ 9A, 10V	230	mOhm
Gate Threshold Voltage (Vgs(th)) @ 1.5mA	4.5	V
Gate Charge (Qg) @ 10V	35	nC
Power Dissipation (Max)	320	W
Operating Temperature Range	-55 to 150	°C
Package Type	TO-220-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Compatibility Requirements:

Drain-Source Voltage (Vdss): Equal to or greater than 600V
Continuous Drain Current (Id): Equal to or greater than 18A at 25°C
Package Type: TO-220-3 through-hole configuration
Operating Temperature Range: -55°C to 150°C minimum
On-Resistance (Rds On): Comparable performance at specified gate voltage and current conditions
Gate Charge (Qg): Acceptable switching characteristics
RoHS3 Compliance and MSL Level 1 rating

Substitution Categories:

Category 1: Direct Functional Equivalent Parts meeting or exceeding all primary electrical parameters with identical or superior performance characteristics.

Category 2: Functional Equivalent with Parameter Trade-offs Parts meeting voltage and current requirements but with variations in secondary parameters such as on-resistance, gate charge, or power dissipation that remain within acceptable application ranges.

Category 3: Partial Equivalents Parts with reduced current ratings or power dissipation that require application-level assessment for suitability.

Parameter Comparison

Parameter	IXFP18N60X	IXFP18N65X2	STP18N60M2	STP18N65M5	SPP15N60C3XKSA1	IPP60R280CFD7XKSA1
Manufacturer	IXYS	IXYS	STMicroelectronics	STMicroelectronics	Infineon Technologies	Infineon Technologies
Vdss (V)	600	650	600	650	650	650
Id @ 25°C (A)	18	18	13	15	15	9
Rds On @ 10V (mOhm)	230 @ 9A	200 @ 9A	280 @ 6.5A	220 @ 7.5A	280 @ 9.4A	280 @ 3.6A
Vgs(th) (V)	4.5	5.0	4.0	5.0	3.9	4.5
Qg @ 10V (nC)	35	29	21.5	31	63	18
Power Dissipation (W)	320	290	110	110	156	52
Operating Temp (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package	TO-220-3	TO-220	TO-220	TO-220	TO-220-3	TO-220-3
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS3 Compliant	Yes	Yes	Yes	Yes	Yes	Yes

Engineering Selection Recommendations

IXFP18N65X2 (IXYS) — Recommended Primary Substitute

The IXFP18N65X2 is the preferred direct replacement for the IXFP18N60X. This part maintains identical continuous drain current (18A) and operating temperature range while providing enhanced voltage rating (650V vs. 600V). On-resistance is improved (200mOhm vs. 230mOhm at 9A, 10V), and gate charge is reduced (29nC vs. 35nC), resulting in superior switching efficiency. The device is active in production with full RoHS3 compliance and MSL Level 1 rating. Pinout and TO-220-3 package compatibility are maintained.

STP18N65M5 (STMicroelectronics) — Secondary Substitute

The STP18N65M5 provides functional equivalence with reduced continuous drain current (15A vs. 18A) and power dissipation (110W vs. 320W). This part is suitable for applications where the full 18A rating is not required. Voltage rating is elevated to 650V, and on-resistance (220mOhm at 7.5A, 10V) remains acceptable. Active production status and full compliance certifications are confirmed.

SPP15N60C3XKSA1 (Infineon Technologies) — Partial Equivalent

The SPP15N60C3XKSA1 operates at 650V with 15A continuous drain current, representing a current reduction from the original 18A specification. Power dissipation is limited to 156W. This part is applicable only to applications where current demand does not exceed 15A. Gate charge is elevated (63nC vs. 35nC), affecting switching speed. Active production and compliance certifications are confirmed.

STP18N60M2 (STMicroelectronics) — Voltage-Matched Alternative

The STP18N60M2 maintains the 600V voltage rating with reduced continuous drain current (13A vs. 18A) and power dissipation (110W vs. 320W). This part is restricted to applications with current requirements below 13A. On-resistance is higher (280mOhm at 6.5A, 10V). Active production status and compliance certifications are confirmed.

IPP60R280CFD7XKSA1 (Infineon Technologies) — Limited Equivalence

The IPP60R280CFD7XKSA1 provides 650V voltage rating with significantly reduced continuous drain current (9A vs. 18A) and power dissipation (52W vs. 320W). This part is suitable only for low-current applications. Gate charge is minimal (18nC), supporting fast switching. Active production and compliance certifications are confirmed.

Frequently Asked Questions (FAQ)

Q: Can the IXFP18N65X2 be used as a direct drop-in replacement for the IXFP18N60X?

A: Yes. The IXFP18N65X2 maintains identical continuous drain current (18A), operating temperature range (-55°C to 150°C), and TO-220-3 package configuration. The elevated voltage rating (650V vs. 600V) and improved on-resistance provide enhanced performance margins. Pinout compatibility is confirmed.

Q: What is the primary limitation of the STP18N65M5 as a substitute?

A: The STP18N65M5 has a reduced continuous drain current rating of 15A compared to the original 18A specification. This part is suitable only for applications where the maximum required current does not exceed 15A. Power dissipation is also reduced to 110W.

Q: Why do some substitute parts have significantly lower power dissipation ratings?

A: Power dissipation differences reflect variations in on-resistance, current rating, and thermal design. Parts with lower current ratings (such as the IPP60R280CFD7XKSA1 at 9A) inherently dissipate less power under equivalent operating conditions. Application thermal requirements must be evaluated independently.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry RoHS3 compliance certification and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original IXFP18N60X specifications.

Q: What is the significance of gate charge (Qg) differences among substitute parts?

A: Gate charge affects switching speed and driver circuit requirements. Lower gate charge (such as the 18nC of the IPP60R280CFD7XKSA1) enables faster switching transitions, while higher gate charge (such as the 63nC of the SPP15N60C3XKSA1) requires longer switching times. Driver circuit compatibility must be confirmed for each substitute.

Q: Can parts with lower current ratings be used in applications designed for 18A operation?

A: No. Parts with reduced current ratings (STP18N60M2 at 13A, STP18N65M5 at 15A, SPP15N60C3XKSA1 at 15A, IPP60R280CFD7XKSA1 at 9A) must not be used in applications requiring the full 18A continuous drain current. Exceeding the rated current will result in device failure and thermal runaway.

Q: Are there package differences between the IXFP18N60X and its substitutes?

A: The IXFP18N65X2, STP18N60M2, and STP18N65M5 are supplied in TO-220 packages, which are mechanically compatible with TO-220-3 through-hole mounting. The SPP15N60C3XKSA1 and IPP60R280CFD7XKSA1 are supplied in TO-220-3 packages with identical pinout compatibility.

Q: What is the production status of available substitutes?

A: All listed substitute parts are in active production. The original IXFP18N60X is classified as obsolete, making substitution necessary for new designs and ongoing production requirements.

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