IXFH32N50 N-Channel 500V 32A MOSFET Equivalent & Substitute Parts

Part Overview

The IXFH32N50 is an N-Channel 500V 32A MOSFET manufactured by IXYS in the HiPerFET™ series, housed in a TO-247AD through-hole package. This device is classified as obsolete, indicating discontinuation from active production. The part delivers 360W maximum power dissipation at case temperature and operates across a temperature range of -55°C to 150°C. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	500	V
Continuous Drain Current (Id) @ 25°C	32	A
Rds On (Max) @ 15A, 10V	150	mOhm
Gate Charge (Qg) @ 10V	300	nC
Power Dissipation (Max)	360	W
Operating Temperature Range	-55 to 150	°C
Package Type	TO-247AD	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the IXFH32N50 is determined by strict alignment of electrical and mechanical parameters. The following criteria establish valid substitution relationships:

Primary Substitution Criteria:

FET Type: N-Channel (mandatory match)
Drain to Source Voltage (Vdss): 500V minimum (equal or higher acceptable)
Continuous Drain Current (Id): 32A minimum (equal or higher acceptable)
Package Type: TO-247 series (TO-247AD, TO-247-3, TO-247AC acceptable)
Mounting Type: Through Hole (mandatory match)
Operating Temperature Range: -55°C to 150°C minimum (equal or wider acceptable)

Secondary Compatibility Parameters:

Rds On (Max): Lower or equal values indicate improved performance
Gate Charge (Qg): Lower values indicate faster switching characteristics
Power Dissipation: Higher values indicate greater thermal capability

Substitute parts are categorized as Direct Substitutes (same base electrical specifications with active product status) or Similar Substitutes (meet or exceed electrical requirements with different package variants or voltage ratings).

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On Max (mOhm)	Qg @ 10V (nC)	Power Diss. (W)	Package	Status
IXFH32N50	IXYS	500	32	150	300	360	TO-247AD	Obsolete
IXFH36N50P	IXYS	500	36	170	93	540	TO-247AD	Active
IXFH44N50P	IXYS	500	44	140	98	658	TO-247AD	Active
FQL40N50F	onsemi	500	40	110	200	460	TO-264-3	Obsolete
IPW50R140CPFKSA1	Infineon	550	23	140	64	192	TO-247-3	Last Time Buy
IPW50R250CPFKSA1	Infineon	500	13	250	36	114	TO-247-3	Active
IRFP448PBF	Vishay Siliconix	500	11	600	84	180	TO-247-3	Active
STW26NM50	STMicroelectronics	500	30	120	106	313	TO-247-3	Not For New Designs
STW28NM50N	STMicroelectronics	500	21	158	50	150	TO-247-3	Active
STW33N60DM2	STMicroelectronics	600	24	130	43	190	TO-247-3	Active

Engineering Selection Recommendations

Direct Substitutes (IXYS HiPerFET™ Series):

The IXFH36N50P and IXFH44N50P represent direct substitutes within the same manufacturer's active product line. Both devices maintain 500V Vdss rating and TO-247AD packaging. The IXFH36N50P provides 36A continuous drain current with improved gate charge characteristics (93 nC versus 300 nC), while the IXFH44N50P delivers 44A with superior Rds On performance (140 mOhm versus 150 mOhm). Both parts carry Active product status and ROHS3 compliance, making them suitable for new designs.

Cross-Manufacturer Substitutes (500V Rating):

The STW26NM50 (STMicroelectronics) and STW28NM50N (STMicroelectronics) meet the 500V Vdss requirement. The STW26NM50 delivers 30A continuous current with 120 mOhm Rds On but carries "Not For New Designs" status. The STW28NM50N, classified as Active, provides 21A continuous current with 158 mOhm Rds On and significantly reduced gate charge (50 nC), suitable for applications where switching speed is prioritized.

Higher Voltage Alternatives:

The STW33N60DM2 (STMicroelectronics) and FQL40N50F (onsemi) exceed the 500V requirement with 600V and 500V ratings respectively. The STW33N60DM2 is Active with 24A continuous current and superior Rds On (130 mOhm). The FQL40N50F, though obsolete, provides 40A continuous current with excellent Rds On performance (110 mOhm) in TO-264-3 packaging.

Lower Current Alternatives:

The IPW50R250CPFKSA1 (Infineon) and IRFP448PBF (Vishay Siliconix) deliver reduced continuous current (13A and 11A respectively) but maintain 500V Vdss rating. Both are Active products with ROHS3 compliance. These parts are applicable only where circuit requirements permit lower current ratings.

Compliance Considerations:

All recommended Active and Last Time Buy substitutes carry ROHS3 compliance and REACH Unaffected status, matching the original part's regulatory profile. Parts classified as "Not For New Designs" should be avoided in new circuit development.

Frequently Asked Questions (FAQ)

Q: Can the IXFH36N50P directly replace the IXFH32N50 in existing designs?

A: Yes. The IXFH36N50P maintains identical 500V Vdss rating and TO-247AD packaging. The higher 36A continuous current rating and improved gate charge (93 nC) provide enhanced performance. Thermal design must accommodate the increased power dissipation capability (540W versus 360W). Verify gate drive circuitry compatibility with ±30V Vgs maximum rating versus the original ±20V.

Q: What is the primary advantage of the IXFH44N50P over the IXFH32N50?

A: The IXFH44N50P delivers superior Rds On performance (140 mOhm at 22A versus 150 mOhm at 15A), resulting in lower conduction losses. Gate charge is comparable (98 nC), but power dissipation capability increases to 658W. The part is Active with ROHS3 compliance, ensuring long-term availability.

Q: Why is the STW26NM50 marked "Not For New Designs" despite meeting electrical specifications?

A: Product status reflects manufacturer lifecycle decisions independent of electrical performance. Parts marked "Not For New Designs" have limited production commitment and may face supply constraints. Active alternatives such as STW28NM50N or IXFH36N50P are preferred for new circuit development.

Q: Can the FQL40N50F substitute for the IXFH32N50 despite different packaging?

A: The FQL40N50F meets electrical requirements (500V, 40A) but uses TO-264-3 packaging instead of TO-247AD. PCB layout modifications are required. Additionally, the part is obsolete, creating long-term supply risk. Active alternatives in TO-247 packaging are recommended.

Q: What is the significance of gate charge (Qg) differences between substitutes?

A: Gate charge directly affects switching speed and gate drive power requirements. Lower Qg values (e.g., STW28NM50N at 50 nC) enable faster switching with reduced driver stress. Higher Qg values (e.g., IXFH32N50 at 300 nC) require more robust gate drive circuits but may offer other performance benefits. Selection depends on circuit switching frequency and driver capability.

Q: Are TO-247-3 and TO-247AD packages mechanically interchangeable?

A: Both packages are three-lead through-hole devices with identical pin assignments (Gate, Drain, Source). Mechanical dimensions are similar, permitting PCB footprint reuse. However, verify specific package outline drawings with the manufacturer datasheet, as minor dimensional variations may exist between variants.

Q: Which substitute offers the best Rds On performance?

A: The FQL40N50F delivers the lowest Rds On at 110 mOhm (20A, 10V), followed by STW26NM50 at 120 mOhm (13A, 10V) and STW33N60DM2 at 130 mOhm (12A, 10V). However, FQL40N50F is obsolete. Among Active products, IXFH44N50P provides 140 mOhm performance.

Q: Can the IPW50R250CPFKSA1 be used in high-current applications?

A: No. The IPW50R250CPFKSA1 is rated for only 13A continuous current, significantly below the IXFH32N50's 32A rating. This part is suitable only for applications with reduced current requirements. For equivalent or higher current capability, select IXFH36N50P, IXFH44N50P, or STW26NM50.

Q: What compliance certifications should be verified for production use?

A: All recommended substitutes carry ROHS3 compliance and REACH Unaffected status. Verify ECCN classification (all listed parts are EAR99) and HTSUS code (8541.29.0095) for export and tariff compliance. Confirm Moisture Sensitivity Level (MSL) requirements for storage and handling procedures.

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