IXFL39N90 Equivalent & Substitute Parts

Part Overview

The IXFL39N90 is an N-Channel 900V 34A MOSFET manufactured by IXYS in the HiPerFET™ series, housed in the ISOPLUS264™ package. This device is rated for 580W power dissipation and operates across a temperature range of -55°C to 150°C. The part is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	900	V
Continuous Drain Current (Id) @ 25°C	34	A
On-State Resistance (Rds On Max) @ 10V	220	mOhm
Gate Threshold Voltage (Vgs(th)) @ 8mA	5	V
Power Dissipation (Max)	580	W
Operating Temperature Range	-55 to 150	°C
Package Type	ISOPLUS264™	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the IXFL39N90 is determined by the following critical electrical and mechanical parameters:

Voltage Rating: The substitute must maintain the 900V Vdss specification to ensure safe operation in the intended application circuit.

Current Capability: The substitute must support continuous drain current at or above the 34A specification at 25°C to handle the same load conditions.

On-State Resistance: The Rds On value directly impacts power dissipation and thermal performance. Substitutes with comparable or lower Rds On values maintain equivalent or improved efficiency.

Gate Drive Voltage: The 10V drive voltage specification must be compatible with the substitute device.

Package Compatibility: While the IXFL39N90 uses ISOPLUS264™ packaging, substitute parts may use alternative through-hole packages (TO-247-3) provided the electrical performance meets or exceeds the original specification.

Product Status: Active status substitutes are preferred for long-term availability and supply chain reliability.

Parameter Comparison

Parameter	IXFL39N90	STW21N90K5	STW23N85K5	Unit
Manufacturer	IXYS	STMicroelectronics	STMicroelectronics	—
Drain to Source Voltage (Vdss)	900	900	850	V
Continuous Drain Current (Id) @ 25°C	34	18.5	19	A
On-State Resistance (Rds On Max) @ 10V	220	299	275	mOhm
Gate Threshold Voltage (Vgs(th)) @ Id	5 @ 8mA	5 @ 100µA	5 @ 100µA	V
Power Dissipation (Max)	580	250	250	W
Operating Temperature Range	-55 to 150	-55 to 150	—	°C
Package Type	ISOPLUS264™	TO-247-3	TO-247-3	—
Product Status	Obsolete	Active	Active	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—

Engineering Selection Recommendations

STW21N90K5 (STMicroelectronics)

The STW21N90K5 maintains the 900V Vdss rating and is manufactured by STMicroelectronics as an active product. This device is RoHS3 compliant and carries REACH unaffected status, matching the compliance profile of the IXFL39N90. The continuous drain current of 18.5A is lower than the original 34A specification, and power dissipation is rated at 250W compared to 580W. This substitute is suitable for applications where current and thermal requirements do not exceed these lower ratings.

STW23N85K5 (STMicroelectronics)

The STW23N85K5 operates at 850V Vdss, which is 50V lower than the IXFL39N90 specification. This device is also manufactured by STMicroelectronics as an active product with RoHS3 compliance and REACH unaffected status. The continuous drain current is 19A and power dissipation is 250W. This substitute is applicable only in applications where the 850V voltage rating is acceptable and current/thermal requirements align with the lower specifications.

Both substitute parts are active products with established supply chains, providing superior long-term availability compared to the obsolete IXFL39N90.

Frequently Asked Questions (FAQ)

Q: Can the STW21N90K5 directly replace the IXFL39N90 in all applications?

A: The STW21N90K5 maintains the 900V voltage rating but has reduced current capacity (18.5A versus 34A) and lower power dissipation (250W versus 580W). Direct replacement is limited to applications where these lower ratings are acceptable.

Q: What is the primary difference between the STW21N90K5 and STW23N85K5?

A: The STW21N90K5 maintains 900V Vdss matching the original part, while the STW23N85K5 operates at 850V. Both have similar current and power dissipation specifications. Selection depends on the voltage requirement of the application.

Q: Are there package compatibility concerns when substituting the IXFL39N90?

A: The IXFL39N90 uses ISOPLUS264™ packaging, while both substitute parts use TO-247-3 packaging. PCB layout and thermal management designs must be evaluated for compatibility with the different package footprint and thermal characteristics.

Q: Do the substitute parts meet the same compliance standards as the IXFL39N90?

A: Yes. Both STW21N90K5 and STW23N85K5 are RoHS3 compliant and REACH unaffected, matching the compliance status of the IXFL39N90.

Q: What should be considered when the application requires the full 34A current rating?

A: Neither substitute part meets the 34A continuous drain current specification. Applications requiring this current level require evaluation of alternative N-Channel 900V MOSFETs from other manufacturers or consideration of parallel device configurations.

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