IXFH32N50Q N-Channel 500V 32A MOSFET Equivalent & Substitute Parts

Part Overview

The IXFH32N50Q 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 the industrial temperature range of -55°C to 150°C.

Due to its obsolete status, equivalent and substitute parts are necessary for ongoing system support, design updates, and procurement continuity. Suitable alternatives must maintain electrical compatibility across critical parameters including drain-source voltage rating, continuous drain current capability, on-state resistance characteristics, and thermal performance specifications.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	500	V
Continuous Drain Current (Id) @ 25°C	32	A
On-State Resistance (Rds On) @ 16A, 10V	160	mOhm
Gate Threshold Voltage (Vgs(th)) @ 4mA	4.5	V
Gate Charge (Qg) @ 10V	190	nC
Input Capacitance (Ciss) @ 25V	4925	pF
Power Dissipation (Max)	360	W
Operating Temperature Range	-55 to 150	°C
Package Type	TO-247-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the IXFH32N50Q is determined by the following critical electrical and mechanical parameters:

Primary Compatibility Criteria:

Drain-Source Voltage (Vdss): Must equal or exceed 500V
Continuous Drain Current (Id): Must meet or exceed 32A at 25°C
Package Type: TO-247-3 form factor for mechanical and thermal compatibility
Mounting Type: Through-hole configuration for PCB integration
Operating Temperature Range: Must support -55°C to 150°C minimum

Secondary Performance Considerations:

On-State Resistance (Rds On): Lower values indicate improved efficiency and reduced power dissipation
Gate Charge (Qg): Lower values reduce switching losses and gate drive requirements
Power Dissipation Capability: Must accommodate thermal requirements of the application

Substitute parts are grouped into two categories:

Direct Substitutes (IXYS HiPerFET™ Series): Parts IXFH36N50P and IXFH44N50P maintain identical voltage ratings, superior current ratings, improved on-state resistance, and active product status. These represent the most direct replacements with enhanced performance characteristics.

Cross-Manufacturer Alternatives: Parts from Infineon Technologies (CoolMOS™ series), Vishay Siliconix, and STMicroelectronics (MDmesh™ series) provide functional equivalence with varying current and power dissipation ratings. Selection depends on application-specific current requirements and thermal management capabilities.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Qg (nC)	Power Diss. (W)	Package	Status
IXFH32N50Q	IXYS	500	32	160 @ 16A	190 @ 10V	360	TO-247-3	Obsolete
IXFH36N50P	IXYS	500	36	170 @ 500mA	93 @ 10V	540	TO-247-3	Active
IXFH44N50P	IXYS	500	44	140 @ 22A	98 @ 10V	658	TO-247-3	Active
IPW50R140CPFKSA1	Infineon	550	23	140 @ 14A	64 @ 10V	192	TO-247-3	Last Time Buy
IPW50R250CPFKSA1	Infineon	500	13	250 @ 7.8A	36 @ 10V	114	TO-247-3	Active
IRFP360PBF	Vishay	400	23	200 @ 14A	210 @ 10V	280	TO-247-3	Active
IRFP448PBF	Vishay	500	11	600 @ 6.6A	84 @ 10V	180	TO-247-3	Active
STW26NM50	STMicroelectronics	500	30	120 @ 13A	106 @ 10V	313	TO-247-3	Not For New Designs
STW26NM60N	STMicroelectronics	600	20	165 @ 10A	60 @ 10V	140	TO-247-3	Active
STW28NM50N	STMicroelectronics	500	21	158 @ 10.5A	50 @ 10V	150	TO-247-3	Active

Engineering Selection Recommendations

Recommended Direct Substitutes:

IXFH36N50P and IXFH44N50P are the primary recommended alternatives. Both parts maintain the identical 500V drain-source voltage rating, exceed the 32A continuous drain current requirement, and are classified as active products with full manufacturing support. IXFH36N50P provides a conservative upgrade with 36A capability, while IXFH44N50P delivers enhanced performance with 44A continuous current and superior on-state resistance characteristics. Both are RoHS3 compliant and carry REACH Unaffected status, ensuring regulatory alignment with modern design standards.

Alternative Cross-Manufacturer Options:

STW26NM50 (STMicroelectronics) provides near-equivalent performance with 30A continuous current and 313W power dissipation. However, this part carries a "Not For New Designs" status, limiting its suitability for new development projects despite active inventory availability.

STW28NM50N (STMicroelectronics) is an active product offering 21A continuous current at 500V with improved gate charge characteristics (50 nC). This part is suitable for applications where current requirements are lower than the original 32A specification.

IPW50R250CPFKSA1 (Infineon CoolMOS™) maintains 500V rating with active product status but delivers only 13A continuous current, making it unsuitable for direct replacement in applications requiring the full 32A capability.

Parts Not Recommended:

IRFP360PBF operates at 400V, below the 500V requirement, and is unsuitable for applications requiring the full voltage rating.

IRFP448PBF operates at 500V but provides only 11A continuous current, insufficient for 32A applications.

IPW50R140CPFKSA1 carries "Last Time Buy" status, indicating imminent discontinuation and unsuitability for long-term procurement strategies.

STW26NM60N operates at 600V with only 20A continuous current, representing a voltage upgrade with reduced current capability.

Frequently Asked Questions (FAQ)

Q: Can IXFH36N50P directly replace IXFH32N50Q without circuit modifications?

A: Yes. IXFH36N50P maintains identical 500V drain-source voltage rating, exceeds the 32A continuous current requirement with 36A capability, and uses the same TO-247-3 package. The higher current rating and improved on-state resistance (170 mOhm vs. 160 mOhm) provide enhanced performance margins. No circuit modifications are required.

Q: What is the significance of the "Active" product status versus "Obsolete"?

A: Active status indicates the part is in current production with full manufacturer support, guaranteed availability, and ongoing quality assurance. Obsolete status indicates discontinuation, with no new manufacturing and limited remaining inventory. Substituting to active parts ensures long-term supply chain reliability and design continuity.

Q: Why does IXFH44N50P have lower on-state resistance than IXFH32N50Q despite higher current rating?

A: On-state resistance is a device characteristic determined by die design and process technology. IXFH44N50P represents a newer generation within the HiPerFET™ series with improved silicon technology, resulting in lower resistance (140 mOhm @ 22A) compared to IXFH32N50Q (160 mOhm @ 16A). Lower resistance reduces power dissipation and improves thermal performance.

Q: Can STW28NM50N be used in applications requiring 32A continuous current?

A: No. STW28NM50N is rated for 21A continuous current at 25°C, which is below the 32A requirement. Using this part in a 32A application would exceed its continuous current rating, resulting in excessive junction temperature rise and potential device failure.

Q: What does "Gate Charge (Qg)" represent and why is it important for substitution?

A: Gate charge is the total charge required to drive the MOSFET from off to on state. Lower gate charge reduces switching losses and simplifies gate driver design. IXFH36N50P (93 nC) and IXFH44N50P (98 nC) have significantly lower gate charge than IXFH32N50Q (190 nC), improving switching efficiency. This is a beneficial characteristic for substitution but does not prevent compatibility.

Q: Why is IRFP360PBF not suitable despite being in the same package?

A: IRFP360PBF operates at 400V maximum drain-source voltage, which is below the 500V rating of IXFH32N50Q. Applications designed for 500V operation would exceed this part's voltage rating, causing device breakdown. Package compatibility alone is insufficient for substitution; electrical ratings must be met or exceeded.

Q: Are there thermal considerations when substituting to higher-rated parts?

A: Yes. Higher-rated parts typically have improved thermal characteristics and lower on-state resistance, resulting in reduced power dissipation. IXFH44N50P (658W max dissipation) provides superior thermal performance compared to IXFH32N50Q (360W max dissipation). Existing thermal management solutions will operate more conservatively with higher-rated substitutes, improving reliability margins.

Q: What does "RoHS3 Compliant" mean for component selection?

A: RoHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates the part meets European environmental regulations restricting lead, cadmium, mercury, and other hazardous substances. IXFH36N50P and IXFH44N50P are RoHS3 compliant, ensuring compatibility with modern manufacturing standards and regulatory requirements. IXFH32N50Q does not specify RoHS status, making active RoHS3-compliant alternatives preferable for new designs.

Q: Can parts with higher voltage ratings (550V, 600V) be used as substitutes?

A: Yes, with application-specific considerations. Higher voltage ratings provide additional safety margin and are electrically compatible. STW26NM60N (600V) and IPW50R140CPFKSA1 (550V) can replace 500V-rated parts in applications where voltage headroom is beneficial. However, higher voltage ratings typically result in increased on-state resistance and reduced current capability, which must be evaluated against application requirements.

Q: What is the difference between TO-247AD and TO-247AC packaging?

A: Both are TO-247-3 form factors with identical mechanical dimensions and thermal characteristics. The suffix designates internal lead configuration and manufacturer-specific variations. Parts in either variant are mechanically and thermally interchangeable in TO-247-3 footprints. Electrical performance differences are determined by the semiconductor die, not the package variant.

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