FDZ371PZ Equivalent & Substitute Parts

Part Overview

The FDZ371PZ is a P-Channel MOSFET manufactured by onsemi, rated for 20V drain-to-source voltage with 3.7A continuous drain current at 25°C. The device is housed in a 4-WLCSP (1x1) surface mount package and features PowerTrench® technology. This part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support, production continuity, and system maintenance.

Substiute Parts

FDZ371PZ

onsemiIn Stock: 19738FDZ371PZ Datasheet

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PMCM4401UPEZ

Nexperia USA Inc.In Stock: 9019PMCM4401UPEZ Datasheet

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SI8425DB-T1-E1

Vishay SiliconixIn Stock: 485324SI8425DB-T1-E1 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDZ371PZ is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• FET Type: P-Channel
• Drain to Source Voltage (Vdss): 20V minimum
• Continuous Drain Current (Id) @ 25°C: Equal to or greater than 3.7A
• Gate-Source Voltage (Vgs) Rating: ±8V minimum
• Operating Temperature Range: -55°C to 150°C (TJ)
• Mounting Type: Surface Mount
• Package Category: 4-WLCSP (XFBGA/UFBGA variants acceptable)
• Compliance: ROHS3 Compliant, MSL 1

Substitute Parts Identified:

1. PMCM4401UPEZ (Nexperia USA Inc.) — Meets all critical parameters with 4A continuous drain current and 95 mOhm Rds On @ 3A, 4.5V. Package: 4-WLCSP (0.78x0.78). Status: Obsolete.

2. SI8425DB-T1-E1 (Vishay Siliconix) — Exceeds all critical parameters with 5.9A continuous drain current and 23 mOhm Rds On @ 2A, 4.5V. Package: 4-WLCSP (1.6x1.6). Status: Active.

Parameter Comparison

Engineering Selection Recommendations

SI8425DB-T1-E1 (Vishay Siliconix) is the primary substitute for the FDZ371PZ. This part is currently in active production status, ensuring long-term availability and supply chain stability. It exceeds the electrical performance requirements of the original part with superior drain current capability (5.9A vs. 3.7A) and significantly lower on-resistance (23 mOhm vs. 75 mOhm @ 2A, 4.5V). Both parts maintain identical voltage ratings (20V Vdss), operating temperature range (-55°C to 150°C TJ), and regulatory compliance (ROHS3, MSL 1). The SI8425DB-T1-E1 is suitable for direct replacement in applications where the FDZ371PZ is specified.

PMCM4401UPEZ (Nexperia USA Inc.) serves as a secondary substitute option. This part meets all critical electrical and mechanical parameters with 4A continuous drain current and maintains the same voltage and temperature specifications. However, this part is classified as obsolete, which may limit future availability. The PMCM4401UPEZ is appropriate for applications requiring exact current matching closer to the original 3.7A specification.

Both substitute parts are surface mount devices in 4-WLCSP packages with identical compliance certifications. Package dimensions vary slightly between options, requiring PCB layout verification prior to implementation.

Frequently Asked Questions (FAQ)

Q: Can SI8425DB-T1-E1 directly replace FDZ371PZ in all applications?

A: SI8425DB-T1-E1 meets or exceeds all critical electrical parameters of FDZ371PZ, including voltage rating, current capability, temperature range, and compliance certifications. Direct replacement is supported from an electrical standpoint. PCB layout verification is required due to package dimension differences (1.6x1.6 mm vs. 1x1 mm).

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

A: SI8425DB-T1-E1 offers superior performance with 5.9A continuous drain current and 23 mOhm on-resistance, and maintains active production status. PMCM4401UPEZ provides 4A continuous drain current with 95 mOhm on-resistance and is obsolete. Both meet the minimum 3.7A requirement of the original FDZ371PZ.

Q: Are package dimensions interchangeable between FDZ371PZ and its substitutes?

A: All three parts use 4-WLCSP package technology but with different physical dimensions: FDZ371PZ (1x1 mm), PMCM4401UPEZ (0.78x0.78 mm), and SI8425DB-T1-E1 (1.6x1.6 mm). PCB footprint and layout must be verified for each substitute before implementation.

Q: Do the substitute parts maintain the same compliance and certifications?

A: Yes. Both PMCM4401UPEZ and SI8425DB-T1-E1 are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the FDZ371PZ specifications.

Q: Which substitute should be selected for new designs?

A: SI8425DB-T1-E1 is recommended for new designs due to its active production status, superior electrical performance, and long-term supply availability. PMCM4401UPEZ is suitable only for legacy system support where exact current matching is critical.

Q: What is the impact of different gate charge specifications on circuit design?

A: Gate charge differences (FDZ371PZ: 17 nC @ 4.5V, PMCM4401UPEZ: 10 nC @ 4.5V, SI8425DB-T1-E1: 110 nC @ 10V) affect gate drive circuit design and switching speed. Circuit validation is required when substituting parts with significantly different gate charge values.

Q: Are there thermal performance differences between the substitute parts?

A: Power dissipation ratings differ: FDZ371PZ (1.7W Ta), PMCM4401UPEZ (400 mW Ta / 12.5W Tc), and SI8425DB-T1-E1 (1.1W Ta / 2.7W Tc). Thermal management and PCB design must account for these variations in specific applications.