IXTH32N65X N-Channel 650V 32A MOSFET TO-247 Equivalent & Substitute Parts

Part Overview

The IXTH32N65X is an N-Channel 650V 32A MOSFET manufactured by IXYS in the Ultra X series, housed in a TO-247 through-hole package. This device is rated for 500W power dissipation and operates across a temperature range of -55°C to 150°C. The part is currently in Last Time Buy status, indicating discontinued production with limited inventory availability. Identification of equivalent and substitute parts is necessary to ensure design continuity, support alternative sourcing strategies, and maintain system performance in applications requiring high-voltage switching or power conversion.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	650	V
Continuous Drain Current (Id) @ 25°C	32	A
On-State Resistance (Rds On) @ 16A, 10V	135	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	5.5	V
Gate Charge (Qg) @ 10V	54	nC
Input Capacitance (Ciss) @ 25V	2205	pF
Power Dissipation (Max)	500	W
Operating Temperature Range	-55 to 150	°C
Package Type	TO-247-3
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution of the IXTH32N65X is determined by the following critical parameters:

Voltage Rating (Vdss): The drain-to-source voltage must equal or exceed 650V to maintain system safety margins and prevent device breakdown in high-voltage applications.

Current Rating (Id): The continuous drain current must be sufficient to handle the application load. Parts with equal or higher current ratings (32A or greater) provide direct substitution capability.

Package and Mounting: All substitute parts must use TO-247-3 through-hole packaging to ensure mechanical and thermal compatibility with existing PCB layouts and heatsink assemblies.

On-State Resistance (Rds On): Lower Rds On values indicate improved efficiency and reduced power dissipation. Rds On values within ±30% of the original specification maintain comparable thermal performance.

Gate Charge (Qg) and Input Capacitance (Ciss): These parameters affect switching speed and gate drive requirements. Variations within ±50% of the original values ensure compatibility with existing gate drive circuits.

Temperature Range: Operating temperature range must support the application environment. The standard industrial range of -55°C to 150°C is maintained across all primary substitutes.

Technology and Series: MOSFET technology (Metal Oxide) is consistent across all substitutes. SiCFET (Silicon Carbide) technology represents an alternative with different electrical characteristics and is noted separately.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id (A)	Rds On (mOhm)	Qg (nC)	Ciss (pF)	Power (W)	Temp Range (°C)	Status
IXTH32N65X	IXYS	650	32	135 @ 16A	54 @ 10V	2205 @ 25V	500	-55 to 150	Last Time Buy
IXTH34N65X2	IXYS	650	34	105 @ 17A	53 @ 10V	3120 @ 25V	540	-55 to 150	Active
APT30N60BC6	Microchip Technology	600	30	125 @ 14.5A	88 @ 10V	2267 @ 25V	219	-55 to 150	Active
APT42F50B	Microchip Technology	500	42	130 @ 21A	170 @ 10V	6810 @ 25V	625	-55 to 150	Active
IPW50R140CPFKSA1	Infineon Technologies	550	23	140 @ 14A	64 @ 10V	2540 @ 100V	192	-55 to 150	Last Time Buy
IPW60R099CPAFKSA1	Infineon Technologies	600	31	105 @ 18A	80 @ 10V	2800 @ 100V	255	-40 to 150	Active
IPW60R120P7XKSA1	Infineon Technologies	600	26	120 @ 8.2A	36 @ 10V	1544 @ 400V	95	-55 to 150	Active
SCT3080ALGC11	Rohm Semiconductor	650	30	104 @ 10A, 18V	48 @ 18V	571 @ 500V	134	-55 to 175	Active
STW33N60DM2	STMicroelectronics	600	24	130 @ 12A	43 @ 10V	1870 @ 100V	190	-55 to 150	Active
STW37N60DM2AG	STMicroelectronics	600	28	110 @ 14A	54 @ 10V	2400 @ 100V	210	-55 to 150	Active
STW45NM60	STMicroelectronics	650	45	110 @ 22.5A	134 @ 10V	3800 @ 25V	417	-55 to 150	Active

Engineering Selection Recommendations

Direct Replacement (Recommended Priority):

IXTH34N65X2 is the manufacturer-recommended upgrade from IXYS. This part maintains identical voltage rating (650V), exceeds current capability (34A vs. 32A), and improves on-state resistance (105 mOhm vs. 135 mOhm). The part is in Active production status, ensuring long-term availability. Gate charge and input capacitance remain within acceptable variation ranges. This substitution requires no circuit modifications.

Voltage-Matched Alternatives (650V Rating):

STW45NM60 from STMicroelectronics provides 650V rating with significantly higher current capacity (45A) and improved Rds On (110 mOhm). This part is suitable for applications requiring higher current margins or lower power dissipation. Active production status ensures supply continuity.

SCT3080ALGC11 from Rohm Semiconductor is a SiCFET technology device rated at 650V and 30A. This silicon carbide-based device offers superior switching characteristics and extended temperature capability (175°C junction temperature). Gate drive voltage requirement differs (18V vs. 10V), necessitating gate drive circuit verification before implementation.

Voltage-Reduced Alternatives (600V Rating):

IPW60R099CPAFKSA1 from Infineon Technologies provides 600V rating with 31A current capacity and improved Rds On (105 mOhm). This part includes automotive qualification (AEC-Q101) and is suitable for applications where 600V voltage margin is acceptable. Operating temperature minimum is -40°C.

STW37N60DM2AG from STMicroelectronics provides 600V rating with 28A current capacity. This part includes automotive qualification (AEC-Q101) and is suitable for automotive applications where 600V voltage margin is acceptable.

APT30N60BC6 from Microchip Technology provides 600V rating with 30A current capacity. This part is in Active production status and suitable for applications where 600V voltage margin is acceptable.

Lower Voltage Alternatives (500V Rating):

APT42F50B from Microchip Technology provides 500V rating with significantly higher current capacity (42A). This part is suitable only for applications where 500V voltage rating is sufficient. Higher gate charge (170 nC) and input capacitance (6810 pF) require gate drive circuit verification.

Discontinued or Limited Availability:

IPW50R140CPFKSA1 from Infineon Technologies is in Last Time Buy status. This 550V-rated device provides 23A current capacity and is not recommended for new designs due to supply constraints.

Frequently Asked Questions (FAQ)

Q: Can IXTH34N65X2 directly replace IXTH32N65X without circuit modifications?

A: Yes. IXTH34N65X2 maintains identical voltage rating (650V), exceeds current capability, and improves efficiency. Gate charge and input capacitance variations are within acceptable ranges for standard gate drive circuits. No modifications are required.

Q: What is the primary reason to consider STW45NM60 over IXTH34N65X2?

A: STW45NM60 provides higher current capacity (45A vs. 34A) and lower on-state resistance (110 mOhm vs. 105 mOhm). Selection depends on application current requirements and thermal management capabilities. Both parts maintain 650V rating and TO-247-3 packaging.

Q: Are 600V-rated parts acceptable substitutes for the 650V IXTH32N65X?

A: 600V-rated parts are acceptable only if the application circuit design includes sufficient voltage margin and does not expose the device to transient overvoltages exceeding 600V. System-level voltage stress analysis is required before implementation. 650V-rated alternatives are preferred for direct substitution.

Q: What is the significance of the SCT3080ALGC11 SiCFET technology?

A: SCT3080ALGC11 uses silicon carbide technology instead of traditional MOSFET technology. This provides superior switching speed, lower switching losses, and extended temperature capability (175°C vs. 150°C). Gate drive voltage requirement is 18V instead of 10V, requiring gate drive circuit verification. This device is suitable for high-efficiency applications where switching losses are critical.

Q: How do gate charge (Qg) and input capacitance (Ciss) variations affect gate drive circuit compatibility?

A: Gate charge and input capacitance determine gate drive current and switching speed. Variations within ±50% of the original specification are generally compatible with standard gate drive circuits. Larger variations (such as APT42F50B with 170 nC gate charge) may require gate drive circuit redesign to ensure adequate drive current and switching performance.

Q: Why are some parts listed as Last Time Buy?

A: Last Time Buy status indicates the manufacturer has discontinued production and will not accept new orders after a specified date. IXTH32N65X and IPW50R140CPFKSA1 are in this status. These parts should not be selected for new designs. Active production alternatives are recommended.

Q: What is the difference between TO-247-3 and TO-247 [B] packaging?

A: Both designations refer to the same three-lead through-hole package format. TO-247-3 and TO-247 [B] are mechanically and thermally compatible. Pinout and heatsink mounting are identical.

Q: Can automotive-qualified parts (AEC-Q101) be used in non-automotive applications?

A: Yes. Automotive-qualified parts meet stringent reliability and quality standards and are suitable for any application. Automotive qualification does not restrict use to automotive applications; it indicates enhanced quality assurance.

Q: What is the impact of lower power dissipation ratings on part selection?

A: Power dissipation rating indicates maximum thermal capability at specified junction temperature. Parts with lower power dissipation ratings (such as IPW60R120P7XKSA1 at 95W) are suitable only for applications with lower power levels or where thermal management is not a constraint. Higher power dissipation ratings provide greater thermal margin.

Q: Are there any compliance or regulatory differences between substitute parts?

A: All listed parts are RoHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. No regulatory differences exist between substitute parts. Moisture sensitivity level (MSL 1) is identical across all parts, indicating unlimited shelf life under standard storage conditions.

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