FDB8878 Equivalent & Substitute Parts

Part Overview

The FDB8878 is an N-Channel MOSFET manufactured by onsemi, rated for 30V drain-to-source voltage with 48A continuous drain current at 25°C. The device is housed in a Surface Mount TO-263 (D2PAK) package and dissipates 47.3W at rated conditions. This part is classified as Obsolete, making identification of equivalent and substitute components necessary for ongoing design support and procurement continuity.

Substiute Parts

FDB8878

onsemiIn Stock: 15148FDB8878 Datasheet

Current PartRFQ

PSMN017-30BL,118

Nexperia USA Inc.In Stock: 2850PSMN017-30BL,118 Datasheet

SimilarRFQ

PSMN4R3-30BL,118

Nexperia USA Inc.In Stock: 10797PSMN4R3-30BL,118 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDB8878 is determined by the following critical electrical and mechanical parameters:

Mandatory Matching Parameters:

• Drain to Source Voltage (Vdss): 30V
• Package Type: TO-263 (D2PAK) Surface Mount
• FET Type: N-Channel MOSFET
• Operating Temperature Range: -55°C to 175°C (TJ)
• Gate Voltage Rating (Vgs Max): ±20V

Allowable Variation Parameters:

• Continuous Drain Current (Id): Substitute parts may exceed the 48A rating of the FDB8878
• Rds On (Max): Substitute parts may have lower on-resistance values
• Gate Charge (Qg): Substitute parts may have different gate charge characteristics
• Power Dissipation (Max): Substitute parts may have higher power dissipation ratings

The two substitute parts identified—PSMN017-30BL,118 and PSMN4R3-30BL,118—both maintain the mandatory matching parameters while offering different current and power dissipation ratings suitable for various application requirements.

Parameter Comparison

Engineering Selection Recommendations

PSMN017-30BL,118 Selection Criteria: This substitute is suitable for applications where the FDB8878's 48A continuous drain current exceeds system requirements. The PSMN017-30BL,118 provides 32A continuous drain current with comparable power dissipation (47W). Both parts share identical voltage ratings and operating temperature ranges. The PSMN017-30BL,118 is classified as Obsolete, matching the FDB8878 status. This part is ROHS3 Compliant and REACH Unaffected, providing regulatory alignment for new designs.

PSMN4R3-30BL,118 Selection Criteria: This substitute is suitable for applications requiring higher current capacity or lower on-resistance characteristics. The PSMN4R3-30BL,118 provides 100A continuous drain current with 103W power dissipation, offering significant performance headroom above the FDB8878 specification. Critically, the PSMN4R3-30BL,118 maintains Active product status, ensuring long-term availability and supply chain continuity. This part is ROHS3 Compliant and REACH Unaffected. The lower on-resistance (4.1mOhm @ 15A, 10V) reduces thermal dissipation in high-current applications.

Both substitute parts maintain the mandatory electrical and mechanical parameters required for direct substitution within the TO-263 (D2PAK) package footprint.

Frequently Asked Questions (FAQ)

Q: Can the PSMN017-30BL,118 be used as a direct replacement for the FDB8878?

A: The PSMN017-30BL,118 is electrically compatible with the FDB8878 for applications operating at or below 32A continuous drain current. Both parts share identical 30V Vdss rating, ±20V Vgs maximum, and -55°C to 175°C operating temperature range. The D2PAK package footprint is identical. However, the PSMN017-30BL,118 provides lower current capacity (32A versus 48A), making it unsuitable for applications requiring the full 48A rating of the FDB8878.

Q: Can the PSMN4R3-30BL,118 be used as a direct replacement for the FDB8878?

A: The PSMN4R3-30BL,118 is electrically compatible with the FDB8878 and provides superior performance characteristics. The 100A continuous drain current rating exceeds the FDB8878's 48A specification, and the lower on-resistance (4.1mOhm) reduces power dissipation. Both parts share identical 30V Vdss rating, ±20V Vgs maximum, and -55°C to 175°C operating temperature range. The D2PAK package footprint is identical. The PSMN4R3-30BL,118 maintains Active product status, ensuring supply availability.

Q: What are the key differences between the two substitute parts?

A: The PSMN017-30BL,118 provides 32A continuous drain current with 47W power dissipation and Obsolete product status. The PSMN4R3-30BL,118 provides 100A continuous drain current with 103W power dissipation and Active product status. Both maintain identical voltage ratings and package type. The PSMN4R3-30BL,118 exhibits significantly lower on-resistance (4.1mOhm versus 17mOhm) and higher gate charge (41.5nC versus 10.7nC).

Q: Are there package compatibility concerns when substituting these parts?

A: All three parts—FDB8878, PSMN017-30BL,118, and PSMN4R3-30BL,118—use the TO-263 (D2PAK) Surface Mount package with identical pinout and footprint. No PCB layout modifications are required for substitution.

Q: What compliance certifications apply to these substitute parts?

A: Both substitute parts are ROHS3 Compliant and REACH Unaffected. The FDB8878 status for RoHS compliance is not specified in the provided data. All three parts carry EAR99 ECCN classification and 8541.29.0095 HTSUS code.

Q: Which substitute part should be selected for new designs?

A: The PSMN4R3-30BL,118 is recommended for new designs due to its Active product status, ensuring long-term supply chain availability. The PSMN017-30BL,118 is suitable only for legacy design support where current requirements do not exceed 32A.