FDZ661PZ Equivalent & Substitute Parts

Part Overview

The FDZ661PZ is a P-Channel MOSFET manufactured by onsemi, rated for 20V drain-to-source voltage with 2.6A continuous drain current at 25°C. The device is housed in a 4-WLCSP (0.8x0.8mm) surface mount package and features a maximum on-resistance of 140mOhm at 2A and 4.5V gate-source voltage. This part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Substiute Parts

FDZ661PZ

onsemiIn Stock: 7947FDZ661PZ Datasheet

Current PartRFQ

PMCM4401UPEZ

Nexperia USA Inc.In Stock: 9019PMCM4401UPEZ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDZ661PZ is determined by strict equivalence across the following critical parameters:

Mandatory Matching Criteria:

• FET Type: P-Channel topology
• Drain-to-Source Voltage (Vdss): 20V minimum rating
• Package Type: 4-WLCSP surface mount configuration
• Operating Temperature Range: -55°C to 150°C (TJ)
• RoHS3 Compliance and MSL Level 1 classification

Performance Compatibility Criteria:

• Continuous Drain Current (Id): Equal to or greater than 2.6A at 25°C
• On-Resistance (Rds On): Equal to or lower than 140mOhm at rated conditions
• Gate Charge (Qg): Comparable switching characteristics
• Input Capacitance (Ciss): Compatible with circuit timing requirements

The PMCM4401UPEZ manufactured by Nexperia USA Inc. meets all mandatory criteria and exceeds performance specifications in drain current (4A vs. 2.6A) and on-resistance (95mOhm vs. 140mOhm), making it a direct functional substitute.

Parameter Comparison

Engineering Selection Recommendations

Both the FDZ661PZ and PMCM4401UPEZ are classified as obsolete products. Selection between these parts for new designs or legacy system support is based on the following factors:

Compliance and Regulatory Status: Both parts maintain ROHS3 compliance and MSL Level 1 classification, ensuring compatibility with current manufacturing and environmental standards. Neither part is subject to REACH restrictions, and both carry EAR99 export classification.

Performance Headroom: The PMCM4401UPEZ provides superior electrical performance with 53.6% higher continuous drain current (4A vs. 2.6A) and 32.1% lower on-resistance (95mOhm vs. 140mOhm). This performance margin reduces thermal stress and improves circuit efficiency in applications operating near the FDZ661PZ current limits.

Package Compatibility: Both devices use 4-WLCSP surface mount packages with minimal dimensional variation (0.8x0.8mm vs. 0.78x0.78mm). PCB layout modifications are not required for direct substitution.

Thermal Characteristics: The PMCM4401UPEZ exhibits lower power dissipation at ambient temperature (400mW vs. 1.3W at Ta), with significantly higher power dissipation capability at case temperature (12.5W at Tc). This characteristic supports applications with active thermal management.

Frequently Asked Questions (FAQ)

Q: Can the PMCM4401UPEZ directly replace the FDZ661PZ in existing designs?

A: Yes. Both devices share identical drain-to-source voltage rating (20V), P-Channel topology, operating temperature range (-55°C to 150°C), and 4-WLCSP surface mount package configuration. The PMCM4401UPEZ meets or exceeds all electrical specifications of the FDZ661PZ.

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

A: The PMCM4401UPEZ provides higher continuous drain current (4A vs. 2.6A), lower on-resistance (95mOhm vs. 140mOhm at rated conditions), lower gate-source threshold voltage (0.9V vs. 1.2V), and reduced input capacitance (420pF vs. 555pF). Gate charge is slightly higher (10nC vs. 8.8nC).

Q: Are there package size differences that affect PCB layout?

A: Package dimensions differ minimally: FDZ661PZ uses 0.8x0.8mm while PMCM4401UPEZ uses 0.78x0.78mm. Both are 4-WLCSP configurations. No PCB redesign is required for substitution.

Q: Do both parts meet current environmental and compliance standards?

A: Yes. Both the FDZ661PZ and PMCM4401UPEZ are ROHS3 compliant, carry MSL Level 1 classification (unlimited moisture exposure), and are REACH unaffected. Both are classified as EAR99 for export purposes.

Q: What is the significance of the lower on-resistance in the PMCM4401UPEZ?

A: Lower on-resistance (95mOhm vs. 140mOhm) reduces conduction losses and heat generation during operation. This improvement is particularly beneficial in applications with continuous or high-frequency switching where thermal management is critical.

Q: Are gate drive requirements different between these parts?

A: Gate-source threshold voltage differs slightly (0.9V vs. 1.2V maximum), and gate charge is marginally higher (10nC vs. 8.8nC). Standard gate driver circuits compatible with 4.5V gate-source voltage operation function with both devices without modification.

Q: Why are both parts classified as obsolete?

A: Obsolete status indicates these parts are no longer in active production by their respective manufacturers. Existing inventory remains available for procurement, but long-term availability is not guaranteed. Design teams should evaluate current-generation alternatives for new product development.