IXTA20N65X N-Channel 650V 20A MOSFET Equivalent & Substitute Parts

Part Overview

The IXTA20N65X is an N-Channel 650V 20A MOSFET manufactured by IXYS in the Ultra X series, housed in a TO-263-3 (D2PAK) surface mount package. This device is classified as Last Time Buy, indicating that the original manufacturer has discontinued active production. The part delivers 320W maximum power dissipation at case temperature and operates across the industrial temperature range of -55°C to 150°C.

Identification of equivalent and substitute parts is necessary due to the Last Time Buy status of the IXTA20N65X. Substitute devices must maintain electrical compatibility across critical parameters including drain-source voltage rating, continuous drain current, on-resistance characteristics, and thermal performance to ensure functional equivalence in existing circuit designs.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	650	V
Continuous Drain Current (Id) @ 25°C	20	A
On-Resistance (Rds On) @ 10A, 10V	210	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	5.5	V
Gate Charge (Qg) @ 10V	35	nC
Power Dissipation (Max)	320	W
Operating Temperature Range	-55 to 150	°C
Package Type	TO-263-3 (D2PAK)	Surface Mount

Substitute Part Grouping Explanation

Substitution of the IXTA20N65X is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-Source Voltage (Vdss): Must equal or exceed 650V
Continuous Drain Current (Id): Must equal or exceed 20A at 25°C
On-Resistance (Rds On): Lower values indicate improved performance; values within ±50mOhm of the original are functionally equivalent
Package Type: Must be TO-263-3 (D2PAK) or compatible surface mount variant
Operating Temperature Range: Must support -55°C to 150°C minimum

Substitute Categories:

Category 1 – Direct Manufacturer Upgrade (IXYS Series): The IXTA20N65X2 is the active production successor from IXYS, maintaining identical voltage and current ratings with improved on-resistance (185mOhm vs. 210mOhm) and reduced power dissipation (290W vs. 320W). This part is in Active product status.

Category 2 – Voltage-Rated Alternatives (600V-650V Range): Parts including R6015KNJTL, R6020FNJTL, and FCB260N65S3 operate at 600V or 650V ratings. These devices accommodate the IXTA20N65X application space but with varying current ratings (12A to 20A) and thermal characteristics. Substitution requires verification that the lower current rating does not exceed application requirements.

Category 3 – Higher Voltage Alternatives (800V Rating): Parts including STB25N80K5 and SPB17N80C3ATMA1 operate at 800V, providing voltage margin above the original 650V specification. These are suitable for applications where higher voltage headroom is acceptable and do not require derating.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On @ 10V (mOhm)	Qg @ 10V (nC)	Power Dissipation (W)	Product Status	Package
IXTA20N65X	IXYS	650	20	210	35	320	Last Time Buy	TO-263-3
IXTA20N65X2	IXYS	650	20	185	27	290	Active	TO-263
FCB260N65S3	onsemi	650	12	260	24	90	Not For New Designs	TO-263
IPB60R280P7ATMA1	Infineon Technologies	600	12	280	18	53	Active	TO-263-3
R6015ENJTL	Rohm Semiconductor	600	15	290	40	40	Active	TO-263-3
R6015KNJTL	Rohm Semiconductor	600	15	290	37.5	184	Active	TO-263-3
R6020FNJTL	Rohm Semiconductor	600	20	280	60	304	Active	TO-263-3
SPB17N80C3ATMA1	Infineon Technologies	800	17	290	177	227	Active	TO-263-3
STB25N80K5	STMicroelectronics	800	19.5	260	40	250	Active	TO-263

Engineering Selection Recommendations

Recommended Primary Substitute: IXTA20N65X2

The IXTA20N65X2 is the preferred substitute for the IXTA20N65X. Both devices are manufactured by IXYS and share identical voltage (650V) and current (20A) ratings. The IXTA20N65X2 is in Active product status, ensuring long-term availability and supply chain continuity. The improved on-resistance (185mOhm vs. 210mOhm) and reduced power dissipation (290W vs. 320W) provide performance enhancement without requiring circuit modification. Both parts maintain RoHS3 compliance and identical operating temperature range (-55°C to 150°C).

Secondary Substitutes for Current-Matched Applications:

R6020FNJTL (Rohm Semiconductor) provides a 20A continuous drain current rating at 600V, matching the original current specification. This part is in Active status with RoHS3 compliance. The 50mOhm increase in on-resistance (280mOhm vs. 210mOhm) and 16nC increase in gate charge are within acceptable engineering tolerance for most applications. Operating temperature range is limited to 150°C maximum (no lower temperature specification provided).

Substitutes for Reduced Current Applications:

R6015KNJTL (Rohm Semiconductor) provides 15A continuous drain current at 600V with Active product status and RoHS3 compliance. This part is suitable for applications where the 20A rating of the original is not fully utilized. The 80mOhm increase in on-resistance and 2.5nC increase in gate charge represent measurable but acceptable deviations.

Higher Voltage Alternatives:

STB25N80K5 (STMicroelectronics) and SPB17N80C3ATMA1 (Infineon Technologies) operate at 800V, providing 150V voltage margin above the original specification. Both parts are in Active status with RoHS3 compliance. STB25N80K5 provides 19.5A continuous drain current, closely matching the original 20A specification. These parts are suitable for applications where higher voltage headroom is required or beneficial for circuit design margins.

Parts Not Recommended for New Designs:

FCB260N65S3 (onsemi) is classified as Not For New Designs and provides only 12A continuous drain current, significantly below the original 20A specification. This part is not suitable as a substitute for the IXTA20N65X.

Frequently Asked Questions (FAQ)

Q: Can the IXTA20N65X2 be used as a direct replacement for the IXTA20N65X without circuit modification?

A: Yes. The IXTA20N65X2 maintains identical voltage (650V) and current (20A) ratings, operates across the same temperature range (-55°C to 150°C), and uses the same TO-263-3 package. The improved electrical characteristics (lower on-resistance and gate charge) are beneficial and do not require design changes.

Q: What is the significance of the 50V difference between 650V and 600V rated devices?

A: The 50V difference represents the maximum drain-source voltage the device can sustain. A 600V-rated device (such as R6015KNJTL or R6020FNJTL) cannot be used in applications where the IXTA20N65X operates at or near 650V. These devices are suitable only for applications with maximum operating voltages at or below 600V.

Q: Why do some substitute parts have lower current ratings (12A or 15A) compared to the original 20A?

A: Lower current ratings indicate the maximum continuous drain current the device can supply at 25°C case temperature. Substitution with a lower-rated device is acceptable only if the application circuit does not require the full 20A current. Exceeding the rated current causes excessive power dissipation and thermal stress.

Q: What does "Last Time Buy" status mean for the IXTA20N65X?

A: Last Time Buy indicates that IXYS has discontinued active production of this part. Existing inventory may be available from distributors, but no new manufacturing runs are planned. Substitution with an Active status part (such as IXTA20N65X2) is necessary for long-term design sustainability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference are RoHS3 compliant, matching the compliance status of the original IXTA20N65X. All parts also maintain MSL 1 (Unlimited) moisture sensitivity level and REACH Unaffected status.

Q: What is the impact of on-resistance (Rds On) differences between substitute parts?

A: On-resistance directly affects power dissipation and heat generation. Lower on-resistance values reduce power loss and thermal stress. The IXTA20N65X specifies 210mOhm at 10A and 10V gate voltage. Substitute parts with higher on-resistance (such as 260mOhm or 280mOhm) generate proportionally more heat and may require thermal management review in power-limited applications.

Q: Can the 800V-rated parts (STB25N80K5, SPB17N80C3ATMA1) be used in place of the 650V IXTA20N65X?

A: Yes, from a voltage rating perspective. The 800V rating provides 150V margin above the 650V specification. However, these parts have different gate charge characteristics (40nC and 177nC respectively, compared to 35nC for the original). Gate charge affects switching speed and driver circuit requirements. Circuit validation is necessary to confirm compatibility with the gate driver circuit.

Q: What package compatibility exists between TO-263-3 and D2PAK designations?

A: TO-263-3 and D2PAK (2 Leads + Tab) are equivalent package designations for the same physical form factor. All substitute parts listed use this package type or compatible variants (TO-263, TO-263AB, PG-TO263-3). Physical footprint compatibility is maintained across all listed substitutes.

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