IXFA18N65X2 Equivalent & Substitute Parts

Part Overview

The IXFA18N65X2 is an N-Channel 650V 18A MOSFET manufactured by IXYS in the HiPerFET™ Ultra X2 series. This device is packaged in TO-263 (D2PAK) surface mount configuration and is rated for 290W maximum power dissipation at case temperature. The part is currently Active in product status with full RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are necessary when the primary part becomes unavailable, when alternative packaging or thermal characteristics better suit application requirements, or when design flexibility demands evaluation of functionally equivalent alternatives within the same voltage and current class.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	650	V
Continuous Drain Current (Id) @ 25°C	18	A
Rds On (Max) @ 9A, 10V	200	mOhm
Gate Threshold Voltage (Vgs(th)) @ 1.5mA	5	V
Gate Charge (Qg) @ 10V	29	nC
Power Dissipation (Max)	290	W
Operating Temperature Range	-55 to 150	°C
Package Type	TO-263 (D2PAK)	—
Product Status	Active	—

Substitute Part Grouping Explanation

Substitution eligibility for N-Channel MOSFETs in this voltage class is determined by the following criteria:

Primary Substitution Parameters:

Drain to Source Voltage (Vdss): Substitute must equal or exceed the main part specification
Continuous Drain Current (Id): Substitute must equal or exceed the main part specification
Package Type: Substitute must be compatible with TO-263 (D2PAK) footprint
Gate Drive Voltage: Substitute must operate at 10V gate drive
Operating Temperature Range: Substitute must support the application temperature envelope

Secondary Compatibility Parameters:

Rds On characteristics must be within acceptable range for the application
Gate charge and input capacitance affect switching performance
Power dissipation rating must support thermal requirements

The substitute parts listed below meet the primary substitution criteria with the following considerations:

FCB20N60FTM (onsemi): 600V, 20A rating with lower Vdss but higher current capability; product status is Not For New Designs
R6020KNJTL (Rohm): 600V, 20A rating with active product status and full temperature range support
R6020ENJTL (Rohm): 600V, 20A rating with active product status but limited to 150°C maximum junction temperature
R6024ENJTL (Rohm): 600V, 24A rating with higher current capability but limited to 150°C maximum junction temperature

Parameter Comparison

Parameter	IXFA18N65X2	FCB20N60FTM	R6020KNJTL	R6020ENJTL	R6024ENJTL
Manufacturer	IXYS	onsemi	Rohm Semiconductor	Rohm Semiconductor	Rohm Semiconductor
Vdss (V)	650	600	600	600	600
Id @ 25°C (A)	18	20	20	20	24
Rds On (Max) @ 10V (mOhm)	200 @ 9A	190 @ 10A	196 @ 9.5A	196 @ 9.5A	165 @ 11.3A
Gate Charge @ 10V (nC)	29	98	40	60	70
Power Dissipation (Max) (W)	290	208	231	40	40
Operating Temperature (°C)	-55 to 150	-55 to 150	-55 to 150	to 150	to 150
Package	TO-263 (D2PAK)	TO-263 (D2PAK)	LPTS	LPTS	LPTS
Product Status	Active	Not For New Designs	Active	Active	Active
RoHS3 Compliance	Yes	Yes	Yes	Yes	Yes

Engineering Selection Recommendations

IXFA18N65X2 (Primary Part) Use this part for new designs requiring 650V blocking voltage with 18A continuous current capability. Active product status ensures long-term availability and supply chain stability. Full temperature range operation (-55°C to 150°C) supports demanding thermal environments.

R6020KNJTL (Recommended Substitute) This Rohm Semiconductor part is the preferred substitute for applications where 600V blocking voltage is acceptable. Active product status and full temperature range support (-55°C to 150°C) provide equivalent operational flexibility to the primary part. The 20A current rating exceeds the main part specification, providing design margin. Gate charge of 40 nC is lower than FCB20N60FTM, reducing switching losses.

R6020ENJTL (Alternative Substitute) This part is suitable for applications with relaxed thermal requirements (maximum 150°C junction temperature). Active product status supports new designs. The 20A current rating and 196 mOhm Rds On provide functional equivalence at reduced power dissipation rating (40W).

R6024ENJTL (Higher Current Alternative) This part provides 24A continuous current capability with improved Rds On characteristics (165 mOhm). Suitable for applications requiring higher current handling with 600V blocking voltage. Limited to 150°C maximum junction temperature and 40W power dissipation rating.

FCB20N60FTM (Not Recommended for New Designs) This onsemi part carries "Not For New Designs" product status. While it meets voltage and current requirements, its obsolescence trajectory makes it unsuitable for long-term production applications. Use only when existing inventory must be consumed or for legacy system maintenance.

Frequently Asked Questions (FAQ)

Q: Can R6020KNJTL replace IXFA18N65X2 in all applications?

A: R6020KNJTL is functionally equivalent for applications where 600V blocking voltage is acceptable. The lower Vdss (600V vs. 650V) requires verification that the application does not depend on the additional 50V margin. The 20A current rating exceeds the 18A requirement, providing design margin. Full temperature range support (-55°C to 150°C) matches the primary part.

Q: What is the difference between R6020KNJTL and R6020ENJTL?

A: Both parts share identical electrical characteristics (600V, 20A, 196 mOhm Rds On). The primary difference is maximum junction temperature: R6020KNJTL supports -55°C to 150°C, while R6020ENJTL is limited to 150°C maximum. R6020KNJTL also provides 231W power dissipation versus 40W for R6020ENJTL. Select R6020KNJTL for applications requiring full temperature range or higher power dissipation capability.

Q: Why does FCB20N60FTM have higher gate charge than other substitutes?

A: FCB20N60FTM exhibits 98 nC gate charge at 10V, significantly higher than R6020KNJTL (40 nC) and R6020ENJTL (60 nC). Higher gate charge increases switching losses and requires higher gate drive current. This characteristic, combined with "Not For New Designs" status, makes this part less favorable for new applications.

Q: Are the LPTS package substitutes pin-compatible with TO-263 (D2PAK)?

A: LPTS and TO-263 (D2PAK) packages are both surface mount configurations with similar footprints and pin assignments. However, LPTS is a distinct package type. Verify PCB layout compatibility and thermal performance requirements before substituting. The LPTS package may have different thermal characteristics compared to standard D2PAK.

Q: What is the significance of the 50V difference in Vdss between IXFA18N65X2 and the 600V substitutes?

A: The IXFA18N65X2 provides 650V blocking voltage while substitutes offer 600V. This 50V margin is application-dependent. For designs with transient voltage spikes or safety margins built into the specification, the lower Vdss may be acceptable. For applications operating near maximum voltage limits, the primary part's higher rating is necessary.

Q: Can R6024ENJTL be used when only 18A is required?

A: Yes. R6024ENJTL is rated for 24A continuous current, exceeding the 18A requirement. The higher current rating provides design margin and improved Rds On characteristics (165 mOhm vs. 200 mOhm). However, the 40W power dissipation rating is significantly lower than the primary part (290W), requiring thermal analysis to confirm suitability for the application.

Q: What compliance certifications apply to all listed parts?

A: All parts listed are RoHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. Moisture sensitivity level is 1 (unlimited) for all parts, indicating no special moisture handling requirements during storage or assembly.

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