IXTP20N65X N-Channel 650V 20A MOSFET Equivalent & Substitute Parts

Part Overview

The IXTP20N65X is an N-Channel 650V 20A MOSFET manufactured by IXYS in the Ultra X series, housed in a TO-220-3 through-hole package. This device is rated for 320W power dissipation and operates across a temperature range of -55°C to 150°C. The part is currently in Last Time Buy status, indicating that production is being discontinued. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term product availability for applications requiring this performance class.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	650	V
Continuous Drain Current (Id) @ 25°C	20	A
Rds On (Max) @ 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-220-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the IXTP20N65X is determined by the following critical parameters:

Voltage Rating (Vdss): The drain-to-source voltage must equal or exceed 650V to maintain electrical safety margins in the application circuit.

Current Rating (Id): The continuous drain current must be at least 20A at 25°C to support the load requirements without thermal derating.

On-State Resistance (Rds On): The maximum on-state resistance at specified gate and drain conditions must not significantly exceed 210mOhm to maintain efficiency and thermal performance.

Package and Mounting: The TO-220-3 through-hole package is the primary form factor. Substitutes in alternative packages (TO-247) are listed separately as parametric equivalents but require PCB layout modification.

Temperature Range: Operating temperature range of -55°C to 150°C must be maintained.

Compliance: RoHS3 compliance and REACH unaffected status are required for regulatory alignment.

Substitutes are grouped into three categories:

Manufacturer Recommended: Direct successor from the same manufacturer (IXYS IXTP20N65X2) with improved specifications and active product status.
Parametric Equivalent: Same electrical performance in alternative package (IXTH20N65X in TO-247-3), enabling substitution with mechanical redesign.
Similar Performance: Parts from alternative manufacturers (Infineon, STMicroelectronics) meeting voltage, current, and thermal requirements within acceptable tolerance ranges, though with variations in gate charge, threshold voltage, and on-state resistance.

Parameter Comparison

Parameter	IXTP20N65X	IXTP20N65X2	IXTH20N65X	IPP60R199CPXKSA1	IPP60R180C7XKSA1	STP22NM60N	SPP21N50C3XKSA1
Manufacturer	IXYS	IXYS	IXYS	Infineon	Infineon	STMicroelectronics	Infineon
Vdss (V)	650	650	650	650	600	600	500
Id @ 25°C (A)	20	20	20	16	13	16	21
Rds On (Max) (mOhm)	210	185	210	199	180	220	190
Vgs(th) (Max) (V)	5.5	4.5	5.5	3.5	4	4	3.9
Gate Charge (Max) (nC)	35	27	35	43	24	44	95
Power Dissipation (Max) (W)	320	290	320	139	68	125	208
Package	TO-220-3	TO-220	TO-247-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Product Status	Last Time Buy	Active	Last Time Buy	Not For New Designs	Active	Active	Not For New Designs
Operating Temp Range (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: IXTP20N65X2

The IXTP20N65X2 is the manufacturer-recommended successor from IXYS. It maintains identical voltage (650V) and current (20A) ratings with improved on-state resistance (185mOhm versus 210mOhm) and reduced gate charge (27nC versus 35nC). The part is in Active product status, ensuring long-term availability and supply chain stability. RoHS3 compliance and REACH unaffected status are maintained. This part is the preferred choice for new designs and existing applications requiring direct replacement.

Secondary Recommendation: IXTH20N65X

The IXTH20N65X provides parametric equivalence with identical electrical specifications (650V, 20A, 210mOhm Rds On, 320W power dissipation). The primary difference is the TO-247-3 package, which requires PCB layout modification but offers superior thermal performance through increased lead surface area. This part is suitable for applications where thermal management is critical. Product status is Last Time Buy, consistent with the original part.

Alternative Recommendation: STP22NM60N

The STP22NM60N from STMicroelectronics (MDmesh™ II series) operates at 600V with 16A continuous current and 220mOhm on-state resistance. While voltage is reduced by 50V and current by 4A, this part is in Active product status with high inventory availability (25,100 pieces). It is suitable for applications where the 650V rating is not critical and where 16A current capacity is sufficient. Gate charge is higher (44nC), requiring driver circuit evaluation.

Not Recommended for New Designs:

IPP60R199CPXKSA1 and SPP21N50C3XKSA1 are marked "Not For New Designs" and should be avoided for new product development. These parts may be used only for legacy system maintenance where no alternative exists.

Lower Performance Alternatives:

IPP60R180C7XKSA1 (13A, 600V) and IPP60R280CFD7XKSA1 (9A, 650V) provide reduced current ratings and are suitable only for applications with lower current requirements.

Frequently Asked Questions (FAQ)

Q: Can I use IXTP20N65X2 as a direct drop-in replacement for IXTP20N65X?

A: Yes. The IXTP20N65X2 is electrically and mechanically compatible with the IXTP20N65X in TO-220-3 package. No PCB modifications are required. The improved specifications (lower Rds On and gate charge) provide performance benefits.

Q: What is the difference between IXTP20N65X and IXTH20N65X?

A: Both parts have identical electrical specifications (650V, 20A, 210mOhm Rds On). The primary difference is the package: IXTP20N65X uses TO-220-3, while IXTH20N65X uses TO-247-3. The TO-247 package has larger lead surface area, improving thermal dissipation. PCB layout modification is required for substitution.

Q: Can I substitute STP22NM60N for IXTP20N65X?

A: Substitution is possible with design review. STP22NM60N operates at 600V (50V lower) with 16A (4A lower) continuous current. On-state resistance is comparable (220mOhm versus 210mOhm). Applications must verify that 600V voltage rating is acceptable and that 16A current capacity is sufficient. Gate charge is higher (44nC versus 35nC), requiring driver circuit evaluation.

Q: Why is IXTP20N65X marked as Last Time Buy?

A: Last Time Buy status indicates that IXYS is discontinuing this product line. The IXTP20N65X2 (Active status) is the recommended successor. Existing inventory should be evaluated for transition planning.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All parts listed in this reference are RoHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components.

Q: What is the impact of different gate charge values on circuit design?

A: Gate charge (Qg) affects the gate driver circuit design and switching speed. Higher gate charge (e.g., 44nC in STP22NM60N versus 35nC in IXTP20N65X) requires higher driver current or longer switching times. Driver circuits must be evaluated to ensure adequate gate charge delivery within the required switching frequency.

Q: Can I use IPP60R199CPXKSA1 for new product designs?

A: No. IPP60R199CPXKSA1 is marked "Not For New Designs." This part should be used only for legacy system maintenance or repair. For new designs, use IXTP20N65X2 or STP22NM60N.

Q: What is the thermal performance difference between TO-220-3 and TO-247-3 packages?

A: TO-247-3 packages typically provide superior thermal performance due to larger lead surface area and improved heat dissipation paths. For applications with high power dissipation or elevated ambient temperatures, TO-247-3 (IXTH20N65X) may provide better thermal margin than TO-220-3 (IXTP20N65X).

Q: Are there any gate threshold voltage differences I should consider?

A: Yes. Gate threshold voltage (Vgs(th)) varies across substitutes: IXTP20N65X (5.5V), IXTP20N65X2 (4.5V), IPP60R199CPXKSA1 (3.5V), and STP22NM60N (4V). Lower threshold voltages enable operation with lower gate drive voltages but may increase susceptibility to noise. Gate driver circuits must be evaluated for compatibility.

Q: What inventory status should I consider for long-term supply?

A: IXTP20N65X has 990 pieces in stock with Last Time Buy status. IXTP20N65X2 has 986 pieces (Active status). STP22NM60N has the highest inventory at 25,100 pieces. For long-term supply security, STP22NM60N or IXTP20N65X2 are preferred over the original IXTP20N65X.

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