FDU6N50TU Equivalent & Substitute Parts

Part Overview

The FDU6N50TU is an N-Channel MOSFET manufactured by onsemi, rated for 500V drain-to-source voltage with 6A continuous drain current at 25°C. This device features a through-hole I-PAK (TO-251-3) package and is part of the UniFET™ series. The FDU6N50TU is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Substiute Parts

FDU6N50TU

onsemiIn Stock: 1946FDU6N50TU Datasheet

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FCU900N60Z

onsemiIn Stock: 22951FCU900N60Z Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDU6N50TU is determined by compatibility across the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Drain-to-Source Voltage (Vdss) rating must equal or exceed 500V
• Continuous drain current (Id) must meet or exceed 6A at 25°C
• On-state resistance (Rds On) must not exceed specified maximum values
• Gate threshold voltage (Vgs(th)) must be compatible with existing gate drive circuits
• Gate charge (Qg) and input capacitance (Ciss) must be within acceptable switching performance ranges
• Maximum gate voltage (Vgs Max) must accommodate the drive circuit voltage
• Operating temperature range must support the application environment

Mechanical Compatibility Criteria:

• Package type must be through-hole I-PAK (TO-251-3) to maintain PCB compatibility
• Lead configuration must be compatible with existing board layouts

The FCU900N60Z is identified as a substitute part for the FDU6N50TU based on shared package type, through-hole mounting, and compatible electrical operating ranges within the specified parameters.

Parameter Comparison

Engineering Selection Recommendations

FDU6N50TU Status Considerations: The FDU6N50TU is classified as obsolete. Current inventory of 1,902 pieces is available, but long-term procurement cannot be assured. Design migration to active production parts is recommended for new designs and ongoing production support.

FCU900N60Z as Substitute: The FCU900N60Z is classified as Last Time Buy status with significantly higher inventory availability (22,900 pieces). Both devices are manufactured by onsemi and maintain ROHS3 compliance and REACH Unaffected status, ensuring regulatory alignment.

Key Differences Requiring Circuit Evaluation:

• The FCU900N60Z provides higher Vdss rating (600V vs. 500V), offering increased voltage margin
• Continuous drain current is lower (4.5A vs. 6A), requiring thermal and current distribution analysis
• Power dissipation rating is lower (52W vs. 89W), necessitating thermal management review
• Gate threshold voltage is lower (3.5V vs. 5V), affecting gate drive circuit compatibility
• Maximum gate voltage is reduced (±20V vs. ±30V), requiring gate drive voltage verification
• Input capacitance is lower (710 pF vs. 940 pF), resulting in faster switching characteristics
• Lead configuration differs (stub leads vs. short leads), requiring PCB layout verification

Compliance Status: Both parts maintain identical regulatory compliance across RoHS3, REACH, and ECCN classifications, supporting direct substitution from a regulatory perspective.

Frequently Asked Questions (FAQ)

Q: Can the FCU900N60Z directly replace the FDU6N50TU in existing designs?

A: Direct replacement requires circuit-level evaluation. While both devices share the same package type (TO-251-3 I-PAK through-hole), the FCU900N60Z has lower continuous drain current (4.5A vs. 6A) and reduced power dissipation rating (52W vs. 89W). Applications operating near the 6A current limit or 89W power dissipation limit require thermal and current distribution analysis before substitution.

Q: What are the lead configuration differences between these parts?

A: The FDU6N50TU uses TO-251-3 short leads, while the FCU900N60Z uses TO-251-3 stub leads. Both are through-hole I-PAK packages, but the different lead lengths may require PCB layout modifications. Lead length compatibility with existing board hole spacing and solder pad dimensions must be verified.

Q: How do the gate drive requirements differ?

A: The FCU900N60Z has a lower gate threshold voltage (3.5V vs. 5V) and reduced maximum gate voltage rating (±20V vs. ±30V). Gate drive circuits must be evaluated to ensure compatibility with the lower threshold voltage and maximum gate voltage limits of the substitute part.

Q: Are there switching performance differences?

A: Yes. The FCU900N60Z has lower input capacitance (710 pF vs. 940 pF) and similar gate charge (17 nC vs. 16.6 nC), resulting in faster switching characteristics. This may affect EMI performance and switching losses in the application circuit.

Q: What is the inventory status for each part?

A: The FDU6N50TU (obsolete) has 1,902 pieces in stock. The FCU900N60Z (Last Time Buy) has 22,900 pieces available. For long-term production continuity, the FCU900N60Z is the preferred choice due to higher inventory and active Last Time Buy status.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both the FDU6N50TU and FCU900N60Z are ROHS3 compliant and REACH unaffected, maintaining identical regulatory compliance status.