IXFH12N90 N-Channel 900V 12A MOSFET Equivalent & Substitute Parts

Part Overview

The IXFH12N90 is an N-Channel MOSFET manufactured by IXYS, rated for 900V drain-to-source voltage with 12A continuous drain current at 25°C. This device is packaged in TO-247AD through-hole configuration and belongs to the HiPerFET™ series. The part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating available packaging and product status options.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	900	V
Continuous Drain Current (Id) @ 25°C	12	A
Rds On (Max) @ Id, Vgs	900 mOhm @ 6A, 10V	—
Power Dissipation (Max)	300	W
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-247-3	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the IXFH12N90 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Minimum 900V
Continuous Drain Current (Id): Minimum 12A at 25°C
On-State Resistance (Rds On): Maximum 900 mOhm at rated conditions
Power Dissipation: Minimum 300W
Package Type: TO-247-3 or compatible TO-247 variants
Mounting: Through Hole

Substitution Logic: Parts are grouped into three categories based on electrical performance relative to the IXFH12N90:

Direct Equivalents – Parts with identical or superior Vdss (900V minimum), matching or exceeding Id (12A minimum), and comparable Rds On characteristics. These parts provide pin-compatible replacement with no circuit redesign required.
Enhanced Performance Substitutes – Parts with higher voltage ratings (950V–1000V) or higher current ratings (14A+) that maintain backward compatibility. These parts operate safely in circuits designed for the IXFH12N90 but offer additional design margin.
Lower Current Alternatives – Parts with 900V Vdss but reduced current ratings (3.6A–11A). These are suitable only for applications where the full 12A capability is not required.

All substitute parts listed maintain the TO-247-3 package footprint and through-hole mounting configuration. Operating temperature range (-55°C to 150°C) is consistent across all candidates.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Power Dissipation (W)	Package	Product Status
IXFH12N90	IXYS	900	12	900 @ 6A, 10V	300	TO-247AD	Obsolete
IXFH12N90P	IXYS	900	12	900 @ 6A, 10V	380	TO-247AD	Active
APT14M100B	Microchip Technology	1000	14	900 @ 7A, 10V	500	TO-247-3	Active
STW12NK90Z	STMicroelectronics	900	11	880 @ 5.5A, 10V	230	TO-247-3	Active
STW11NK90Z	STMicroelectronics	900	9.2	980 @ 4.6A, 10V	200	TO-247-3	Active
STW9NK90Z	STMicroelectronics	900	8	1300 @ 3.6A, 10V	160	TO-247-3	Active
STW6N95K5	STMicroelectronics	950	9	1250 @ 3A, 10V	90	TO-247-3	Active
IRFPF50PBF	Vishay Siliconix	900	6.7	1600 @ 4A, 10V	190	TO-247AC	Active
IRFPF40PBF	Vishay Siliconix	900	4.7	2500 @ 2.8A, 10V	150	TO-247AC	Active
IRFPF30PBF	Vishay Siliconix	900	3.6	3700 @ 2.2A, 10V	125	TO-247AC	Active

Engineering Selection Recommendations

Primary Recommendation – Direct Equivalent:

IXFH12N90P (IXYS) is the preferred substitute for the obsolete IXFH12N90. This part maintains identical electrical specifications (900V Vdss, 12A Id, 900 mOhm Rds On) and is pin-compatible in TO-247AD packaging. The IXFH12N90P is classified as Active product status with ROHS3 compliance and REACH Unaffected designation, ensuring long-term availability and regulatory compliance. Enhanced power dissipation rating (380W vs. 300W) provides additional thermal margin without requiring circuit modification.

Secondary Recommendation – Enhanced Performance:

APT14M100B (Microchip Technology) provides superior electrical performance with 1000V Vdss and 14A continuous current capability. This part is suitable for applications requiring higher voltage or current headroom. The device maintains comparable on-state resistance (900 mOhm @ 7A, 10V) and is packaged in TO-247-3 configuration. Active product status and ROHS3 compliance support long-term design continuity.

Alternative Recommendation – STMicroelectronics SuperMESH™ Series:

STW12NK90Z (STMicroelectronics) offers near-equivalent performance with 900V Vdss and 11A continuous current. This part is suitable for applications where 12A capability is not critical. The device features lower on-state resistance (880 mOhm @ 5.5A, 10V) and is available in high inventory (29,400 units). Active product status and ROHS3 compliance ensure procurement reliability.

Compliance and Regulatory Status:

All recommended substitutes maintain ROHS3 compliance and REACH Unaffected status, matching the regulatory profile of the original IXFH12N90. All parts are classified as Active product status, ensuring continued availability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can IXFH12N90P directly replace IXFH12N90 without circuit modification?

A: Yes. IXFH12N90P is pin-compatible and maintains identical electrical specifications (900V Vdss, 12A Id, 900 mOhm Rds On). The part is packaged in TO-247AD and requires no circuit redesign. The enhanced power dissipation rating (380W vs. 300W) provides additional thermal margin.

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

A: Both are through-hole TO-247-3 packages with identical pin configurations and mechanical footprints. TO-247AD and TO-247AC designations reflect manufacturer-specific package variants. Parts in either variant are mechanically and electrically interchangeable on standard PCB layouts.

Q: Can APT14M100B be used in place of IXFH12N90 in all applications?

A: APT14M100B is electrically compatible with higher voltage and current ratings (1000V Vdss, 14A Id). The part operates safely in circuits designed for the IXFH12N90 and provides additional design margin. Pin configuration and TO-247-3 package are compatible. No circuit modification is required.

Q: Why do some substitute parts have lower current ratings than the IXFH12N90?

A: Parts such as STW9NK90Z (8A), STW11NK90Z (9.2A), and IRFPF50PBF (6.7A) are listed as alternatives for applications where the full 12A capability is not required. These parts maintain 900V Vdss and are suitable for reduced-current designs. Selection depends on actual circuit current requirements.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitutes are ROHS3 compliant and REACH Unaffected, matching the regulatory profile of the original IXFH12N90. Compliance status is verified in the product data for each part.

Q: What is the significance of "Active" product status for substitute parts?

A: Active product status indicates that the manufacturer continues to produce and support the part, ensuring long-term availability and supply chain reliability. The original IXFH12N90 is classified as Obsolete, making Active-status substitutes essential for ongoing design support and procurement.

Q: How does on-state resistance (Rds On) affect substitute part selection?

A: Rds On determines power dissipation and thermal performance in the application. The IXFH12N90 specifies 900 mOhm @ 6A, 10V. Substitute parts with comparable or lower Rds On values (such as IXFH12N90P at 900 mOhm or STW12NK90Z at 880 mOhm) provide equivalent or improved thermal performance. Parts with significantly higher Rds On values (such as IRFPF30PBF at 3700 mOhm) are suitable only for lower-current applications.

Q: Can parts with higher voltage ratings (950V–1000V) be used in 900V circuits?

A: Yes. Parts with higher voltage ratings (STW6N95K5 at 950V, APT14M100B at 1000V) operate safely in circuits designed for 900V operation. The higher voltage rating provides additional design margin and does not affect circuit functionality. No modification is required.

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