IXFG55N50 Equivalent & Substitute Parts

Part Overview

The IXFG55N50 is an N-Channel MOSFET manufactured by IXYS, rated for 500V drain-to-source voltage with 48A continuous drain current at 25°C. This device is housed in an ISO264™ through-hole package and is designed for high-power switching applications requiring robust voltage handling and current capacity. The part is classified as Obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new design considerations.

Substiute Parts

IXFG55N50

IXYSIn Stock: 1223IXFG55N50 Datasheet

Current PartRFQ

FCH072N60F

onsemiIn Stock: 18964FCH072N60F Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IXFG55N50 is determined by electrical and mechanical compatibility within the following parameter constraints:

Critical Substitution Parameters:

• Drain-to-Source Voltage (Vdss) must equal or exceed 500V
• Continuous Drain Current (Id) must equal or exceed 48A at 25°C
• On-State Resistance (Rds On) must not exceed the original specification to maintain thermal performance
• Gate Threshold Voltage (Vgs(th)) must be compatible with existing gate drive circuitry
• Gate Charge (Qg) and Input Capacitance (Ciss) must be within acceptable ranges to prevent gate drive circuit redesign
• Operating temperature range must encompass the application requirements
• Mounting type must be through-hole compatible with existing PCB layouts

The FCH072N60F qualifies as a substitute based on superior voltage rating (600V vs. 500V), higher current capacity (52A vs. 48A), lower on-state resistance (72mOhm vs. 90mOhm), and compatible gate drive parameters. The TO-247-3 package is mechanically compatible with through-hole mounting applications, though PCB footprint verification is required.

Parameter Comparison

Engineering Selection Recommendations

For Existing System Support: The FCH072N60F provides electrical performance superior to the IXFG55N50 across all critical parameters. The substitute device offers higher voltage rating, increased current capacity, and reduced on-state resistance, resulting in lower thermal dissipation. Both devices maintain REACH compliance and EAR99 export classification. The FCH072N60F is classified as "Not For New Designs," indicating limited long-term availability; however, current inventory levels (18,900 pcs) support near-term system maintenance and repair operations.

Package Compatibility Consideration: The IXFG55N50 uses ISO264™ packaging while the FCH072N60F uses TO-247-3 packaging. Both are through-hole mount types with three leads (Gate, Drain, Source). PCB footprint modification is required for substitution; however, the mechanical interface remains compatible with standard through-hole assembly processes.

Compliance Status: Both devices are REACH Unaffected and classified under HTSUS 8541.29.0095. The FCH072N60F includes RoHS3 compliance certification, providing additional environmental regulatory alignment for new applications.

Frequently Asked Questions (FAQ)

Q: Can the FCH072N60F directly replace the IXFG55N50 without circuit modification?

A: Electrical substitution is valid based on parameter compatibility. The FCH072N60F exceeds minimum voltage and current requirements and provides superior on-state resistance performance. Gate drive voltage compatibility (±20V maximum for both devices) is maintained. PCB footprint modification is required due to package type difference (ISO264™ to TO-247-3); however, the three-lead through-hole configuration remains functionally equivalent.

Q: What is the significance of the "Not For New Designs" status of the FCH072N60F?

A: This classification indicates the manufacturer does not recommend the device for new product development. For existing system support and maintenance applications, the device remains available and functional. Long-term availability cannot be guaranteed; alternative solutions should be evaluated for future product generations.

Q: Are there thermal performance differences between these devices?

A: The FCH072N60F exhibits lower on-state resistance (72mOhm vs. 90mOhm) and higher maximum power dissipation rating (481W vs. 400W). These characteristics result in reduced junction temperature rise during operation under equivalent load conditions. The extended operating temperature range (-55°C to 150°C vs. -40°C to 150°C) provides additional thermal margin for cold-start applications.

Q: How do gate charge differences affect gate drive circuit design?

A: The FCH072N60F requires lower gate charge (215nC vs. 330nC) at 10V drive voltage. This reduction decreases gate drive current demand and switching transition time. Existing gate drive circuits designed for the IXFG55N50 will operate within acceptable parameters with the substitute device; however, gate drive optimization may improve overall system efficiency.

Q: What packaging considerations apply to this substitution?

A: The IXFG55N50 ISO264™ package and FCH072N60F TO-247-3 package both utilize three-lead through-hole mounting. Mechanical lead spacing and PCB hole positioning differ between packages. Footprint verification and potential PCB layout modification are required prior to component substitution. Both packages are compatible with standard through-hole soldering processes.