FDZ391P MOSFET P-Channel Equivalent & Substitute Parts

Part Overview

The FDZ391P is a P-Channel MOSFET manufactured by onsemi, rated for 20V drain-to-source voltage with 3A continuous drain current at 25°C. This device is packaged in a 6-WL-CSP Thin (1x1.5) surface mount configuration and is classified as obsolete. Due to its obsolete product status, identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for production and repair applications.

Substiute Parts

FDZ391P

onsemiIn Stock: 671FDZ391P Datasheet

Current PartRFQ

PMCM4401UPEZ

Nexperia USA Inc.In Stock: 9019PMCM4401UPEZ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDZ391P is determined by strict electrical and mechanical parameter alignment within the P-Channel MOSFET category. The following parameters establish substitution validity:

Critical Electrical Parameters:

• FET Type: P-Channel (required match)
• Drain to Source Voltage (Vdss): 20V (required match)
• Gate-Source Voltage (Vgs Max): ±8V (required match)
• Operating Temperature Range: -55°C to 150°C (required match)

Performance Parameters (substitution allowed if equal or superior):

• Current - Continuous Drain (Id) @ 25°C: minimum 3A
• Rds On (Max): equal or lower resistance
• Gate Charge (Qg): equal or lower charge
• Input Capacitance (Ciss): equal or lower capacitance

Mechanical & Compliance Parameters:

• Mounting Type: Surface Mount (required match)
• RoHS Status: ROHS3 Compliant (required match)
• Moisture Sensitivity Level: 1 (Unlimited) (required match)

The PMCM4401UPEZ qualifies as a substitute based on matching all critical electrical parameters and exceeding performance specifications in continuous drain current (4A vs. 3A).

Parameter Comparison

Engineering Selection Recommendations

The PMCM4401UPEZ is a valid substitute for the FDZ391P based on the following engineering criteria:

Compliance & Regulatory Alignment: Both devices maintain ROHS3 compliance, REACH unaffected status, and identical ECCN classification (EAR99), ensuring regulatory continuity in design and manufacturing environments.

Electrical Parameter Compatibility: The PMCM4401UPEZ matches all critical electrical specifications: 20V Vdss, ±8V Vgs maximum, and -55°C to 150°C operating temperature range. The substitute device exceeds the original specification in continuous drain current (4A vs. 3A), providing design margin for current-limited applications.

Performance Characteristics: The PMCM4401UPEZ demonstrates superior performance in gate charge (10 nC vs. 13 nC) and input capacitance (420 pF vs. 1065 pF), resulting in faster switching characteristics and reduced gate drive requirements. The threshold voltage is lower (900 mV vs. 1.5V), enabling operation at reduced gate drive voltages.

Mechanical & Packaging Considerations: Both devices are surface mount P-Channel MOSFETs with identical moisture sensitivity levels (MSL 1, Unlimited). Package differences exist: FDZ391P uses 6-WL-CSP Thin (1x1.5) while PMCM4401UPEZ uses 4-WLCSP (0.78x0.78). PCB layout modifications are required to accommodate the different package footprints.

Product Status: Both devices are classified as obsolete. Selection between these parts should prioritize long-term availability and inventory planning with component suppliers.

Frequently Asked Questions (FAQ)

Q: Can the PMCM4401UPEZ directly replace the FDZ391P without circuit modifications?

A: Electrical substitution is valid; however, PCB layout modifications are required due to different package footprints. The FDZ391P uses a 6-WL-CSP Thin (1x1.5) package, while the PMCM4401UPEZ uses a 4-WLCSP (0.78x0.78) package. Gate drive circuitry may be simplified due to lower gate charge and threshold voltage specifications of the substitute.

Q: What are the key electrical parameters that define substitution validity?

A: Substitution validity is determined by matching FET type (P-Channel), Vdss rating (20V), Vgs maximum (±8V), and operating temperature range (-55°C to 150°C). The substitute must meet or exceed the original device's continuous drain current specification (minimum 3A).

Q: How do the gate charge and input capacitance differences affect circuit design?

A: The PMCM4401UPEZ has lower gate charge (10 nC vs. 13 nC) and significantly lower input capacitance (420 pF vs. 1065 pF). These characteristics reduce gate drive power requirements and enable faster switching transitions, potentially improving overall circuit efficiency and frequency response.

Q: Are there compliance or regulatory differences between these devices?

A: No. Both devices are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. Regulatory and compliance requirements are identical.

Q: What is the impact of the different Rds On specifications?

A: The FDZ391P specifies 85 mOhm at 1A and 4.5V gate-source voltage. The PMCM4401UPEZ specifies 95 mOhm at 3A and 4.5V gate-source voltage. At equivalent gate drive conditions, the FDZ391P exhibits lower on-resistance at lower current levels. For applications operating at or above 3A, the PMCM4401UPEZ provides comparable performance with higher current capacity.

Q: Is the lower threshold voltage of the PMCM4401UPEZ (900 mV vs. 1.5V) advantageous?

A: Lower threshold voltage enables gate drive operation at reduced voltage levels, potentially simplifying gate drive circuit design and reducing power consumption in logic-level gate drive applications. This characteristic is particularly beneficial in low-voltage control systems.

Q: What packaging considerations must be addressed during substitution?

A: The PMCM4401UPEZ 4-WLCSP package (0.78x0.78) is smaller than the FDZ391P 6-WL-CSP Thin package (1x1.5). PCB footprint redesign is mandatory. Both devices maintain identical moisture sensitivity levels (MSL 1, Unlimited), so handling and storage requirements remain unchanged.