IXFN66N50Q2 Equivalent & Substitute Parts

Part Overview

The IXFN66N50Q2 is an N-Channel MOSFET rated for 500V drain-to-source voltage with 66A continuous drain current at 25°C, housed in a SOT-227B chassis mount package. This device is part of the IXYS HiPerFET™ series and is classified as obsolete. Due to its obsolete status, equivalent substitute parts from active product lines are necessary for new designs and ongoing production requirements. Substitute devices must maintain compatibility across critical electrical parameters including voltage rating, current capacity, and thermal characteristics while accommodating package and performance variations.

Substiute Parts

IXFN66N50Q2

IXYSIn Stock: 68696IXFN66N50Q2 Datasheet

Current PartRFQ

IXFN80N50Q3

IXYSIn Stock: 883IXFN80N50Q3 Datasheet

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STE53NC50

STMicroelectronicsIn Stock: 3551STE53NC50 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the IXFN66N50Q2 is determined by the following critical parameters:

Primary Substitution Criteria:

• Drain to Source Voltage (Vdss): Must equal 500V
• FET Type: Must be N-Channel
• Technology: Must be MOSFET (Metal Oxide)
• Mounting Type: Must be Chassis Mount
• Operating Temperature Range: Must support -55°C to 150°C minimum

Secondary Compatibility Parameters:

• Continuous Drain Current (Id): Substitute must meet or exceed 66A at 25°C
• Drive Voltage: Must support 10V gate drive
• Rds On (Max): Must not exceed 80mOhm at specified conditions
• Power Dissipation: Should support thermal requirements of target application

Package Considerations:

• Primary package: SOT-227B (miniBLOC) chassis mount
• Alternative packages acceptable if mechanical and thermal mounting compatibility is maintained

The identified substitute parts IXFN80N50Q3 and STE53NC50 meet the primary substitution criteria. IXFN80N50Q3 maintains the same SOT-227B package format with improved specifications. STE53NC50 uses an alternative ISOTOP® package but maintains electrical compatibility within the 500V, N-Channel MOSFET classification.

Parameter Comparison

Engineering Selection Recommendations

IXFN80N50Q3 (IXYS)

The IXFN80N50Q3 is the primary substitute for the IXFN66N50Q2. Both devices share identical package geometry (SOT-227B, miniBLOC) and mounting configuration, enabling direct mechanical compatibility. The IXFN80N50Q3 is classified as Active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. While continuous drain current is slightly lower at 63A compared to 66A, the device delivers superior on-resistance performance (65mOhm versus 80mOhm) and increased power dissipation capability (780W versus 735W). This substitute is suitable for applications where the 3A current reduction is acceptable and improved efficiency is beneficial.

STE53NC50 (STMicroelectronics)

The STE53NC50 provides an alternative substitute with Active product status and ROHS3 compliance. This device maintains the 500V voltage rating and N-Channel MOSFET technology but uses an ISOTOP® package instead of SOT-227B. The continuous drain current is 53A, representing a 20% reduction from the original specification. On-resistance matches the original at 80mOhm. Power dissipation is reduced to 460W. This substitute is applicable only when mechanical package compatibility with ISOTOP® mounting can be accommodated and the lower current rating meets application requirements.

Regulatory and Compliance Considerations

Both substitute parts carry REACH Unaffected status, matching the original device. The IXFN80N50Q3 and STE53NC50 both achieve ROHS3 compliance, providing regulatory advantage over the obsolete IXFN66N50Q2. Selection between substitutes should prioritize package compatibility and current/power requirements specific to the target application.

Frequently Asked Questions (FAQ)

Q: Can the IXFN80N50Q3 be used as a direct replacement for the IXFN66N50Q2?

A: The IXFN80N50Q3 provides direct mechanical and electrical compatibility for most applications. Both devices use the SOT-227B chassis mount package and support identical 500V voltage ratings. The 3A reduction in continuous drain current (63A versus 66A) and improved on-resistance (65mOhm versus 80mOhm) make this substitute suitable when the lower current rating does not exceed application requirements.

Q: What are the key differences between the IXFN80N50Q3 and STE53NC50 substitutes?

A: The primary difference is package type: IXFN80N50Q3 uses SOT-227B (miniBLOC) matching the original, while STE53NC50 uses ISOTOP®. Current ratings differ significantly (63A versus 53A), and power dissipation varies (780W versus 460W). The IXFN80N50Q3 is recommended when package compatibility is critical. The STE53NC50 is suitable only when ISOTOP® mounting can be accommodated and lower current requirements are acceptable.

Q: Is the STE53NC50 suitable for high-current applications?

A: The STE53NC50 continuous drain current of 53A is 20% lower than the original IXFN66N50Q2 specification. This substitute is appropriate only for applications where peak and continuous current demands do not exceed 53A. Applications requiring the full 66A rating should use the IXFN80N50Q3.

Q: What is the significance of the on-resistance (Rds On) differences between substitutes?

A: On-resistance directly affects power dissipation and thermal performance. The IXFN80N50Q3 delivers superior efficiency with 65mOhm on-resistance compared to 80mOhm in both the original and STE53NC50. Lower on-resistance reduces heat generation, improving thermal management and potentially allowing higher current operation within safe limits.

Q: Are both substitute parts compliant with current regulatory standards?

A: Yes. Both IXFN80N50Q3 and STE53NC50 are ROHS3 compliant and REACH Unaffected, meeting current regulatory requirements. The original IXFN66N50Q2, classified as obsolete, does not carry explicit ROHS3 certification. Substitution with either active part ensures regulatory compliance for new designs and production.

Q: What thermal considerations apply when selecting between substitutes?

A: The IXFN80N50Q3 supports 780W maximum power dissipation, exceeding the original 735W specification. The STE53NC50 is limited to 460W. Applications with high thermal loads should prioritize the IXFN80N50Q3. Both devices support the full -55°C to 150°C operating temperature range, though the STE53NC50 datasheet does not explicitly specify the lower temperature limit.

Q: Can package type affect circuit board layout and thermal management?

A: Yes. The SOT-227B package (IXFN66N50Q2 and IXFN80N50Q3) and ISOTOP® package (STE53NC50) have different mechanical footprints and thermal interface characteristics. Direct board-level substitution requires matching package types. If ISOTOP® mounting is not already designed into the circuit board, the STE53NC50 requires layout modifications. The IXFN80N50Q3 maintains identical mechanical compatibility with the original.