FDG328P P-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The FDG328P is an active P-Channel MOSFET manufactured by onsemi, rated for 20V drain-to-source voltage with 1.5A continuous drain current at 25°C. The device is housed in a 6-TSSOP surface mount package (SC-88/SOT-363) and is part of the PowerTrench® series. This component is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1) and is suitable for general-purpose switching and amplification applications in surface mount designs.

Equivalent and substitute parts are identified when alternative manufacturers offer P-Channel MOSFETs with compatible electrical characteristics, matching package configurations, and equivalent operating parameters that allow direct functional replacement in circuit designs.

Substiute Parts

FDG328P

onsemiIn Stock: 16139FDG328P Datasheet

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NTJS4151PT1G

onsemiIn Stock: 143433NTJS4151PT1G Datasheet

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PMG85XP,115

NXP USA Inc.In Stock: 13008PMG85XP,115 Datasheet

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PMG85XPH

Nexperia USA Inc.In Stock: 3381PMG85XPH Datasheet

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SI1403BDL-T1-GE3

Vishay SiliconixIn Stock: 38482SI1403BDL-T1-GE3 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FDG328P are qualified based on the following critical parameters:

Electrical Compatibility Criteria:

• Matching P-Channel FET type
• Identical or higher Drain-to-Source Voltage rating (20V minimum)
• Continuous drain current rating equal to or exceeding 1.5A at 25°C
• Gate threshold voltage within compatible range for standard logic-level gate drive
• Maximum gate voltage rating of ±12V
• Operating temperature range spanning -55°C to 150°C

Mechanical Compatibility Criteria:

• Surface mount package configuration (6-TSSOP/SC-88/SOT-363)
• Pin-compatible footprint allowing direct PCB substitution

Compliance Criteria:

• ROHS3 compliance
• MSL 1 rating (unlimited moisture sensitivity)
• Active product status

Substitute parts are grouped into two categories: Direct Equivalents (matching current rating and on-resistance characteristics) and Enhanced Substitutes (higher current capability with improved performance characteristics while maintaining electrical compatibility).

Parameter Comparison

Engineering Selection Recommendations

SI1403BDL-T1-GE3 (Vishay Siliconix)

This substitute provides direct electrical equivalence to the FDG328P with matching 1.5A continuous drain current and 20V Vdss rating. The on-resistance of 150 mOhm at 4.5V is within acceptable tolerance of the FDG328P specification (145 mOhm). The SI1403BDL-T1-GE3 features lower gate charge (4.5 nC) and reduced power dissipation (625 mW), offering improved switching performance. All compliance certifications match: ROHS3 compliant with MSL 1 rating. Package compatibility is confirmed across 6-TSSOP/SC-88/SOT-363 configurations. Product status is active with 38,400 units in stock.

PMG85XP,115 and PMG85XPH (NXP/Nexperia)

These NXP and Nexperia variants provide enhanced performance substitutes with 2A continuous drain current at 25°C, exceeding the FDG328P requirement. On-resistance is reduced to 115 mOhm at 4.5V, providing lower conduction losses. Gate threshold voltage is lower (1.15V), enabling faster switching response. Both parts maintain 20V Vdss rating and full operating temperature range compatibility (-55°C to 150°C). ROHS3 compliance is confirmed. PMG85XPH includes MSL 1 rating. Both are pin-compatible in 6-TSSOP packages. PMG85XP,115 has 12,900 units in stock; PMG85XPH has 3,294 units available.

NTJS4151PT1G (onsemi)

This enhanced substitute from onsemi offers superior current handling at 3.3A continuous drain current, with significantly reduced on-resistance of 60 mOhm at 4.5V. The NTJS4151PT1G maintains 20V Vdss rating and full temperature range compatibility. Gate charge is 10 nC at 4.5V with higher input capacitance (850 pF), reflecting the increased current capability. Power dissipation rating is 1W, supporting higher power applications. All compliance requirements are met: ROHS3 compliant with MSL 1 rating. Package compatibility is confirmed across SC-88/SC70-6/SOT-363 configurations. Product status is active with 143,400 units in stock.

Frequently Asked Questions (FAQ)

Q: Can the SI1403BDL-T1-GE3 be used as a direct replacement for the FDG328P?

A: Yes. The SI1403BDL-T1-GE3 meets all electrical and mechanical compatibility requirements. Both devices are rated for 20V Vdss, 1.5A continuous drain current, and operate across -55°C to 150°C. On-resistance values are within acceptable tolerance (150 mOhm vs. 145 mOhm at 4.5V). Package configurations are compatible (6-TSSOP/SC-88/SOT-363). Both are ROHS3 compliant with MSL 1 rating.

Q: What is the advantage of using NTJS4151PT1G over the FDG328P?

A: The NTJS4151PT1G provides higher current capacity (3.3A vs. 1.5A) and significantly lower on-resistance (60 mOhm vs. 145 mOhm at 4.5V). These characteristics reduce conduction losses and heat dissipation in applications requiring higher switching currents. The device maintains identical voltage ratings and temperature range, with full compliance certification. This substitute is suitable for designs requiring improved thermal performance or higher current switching capability.

Q: Are PMG85XP,115 and PMG85XPH electrically identical?

A: Yes. Both parts share identical electrical specifications: 20V Vdss, 2A continuous drain current, 115 mOhm on-resistance at 4.5V, and 1.15V gate threshold voltage. The primary difference is packaging format: PMG85XP,115 is supplied without specified packaging, while PMG85XPH is supplied in Tape & Reel (TR) format. Both are ROHS3 compliant and pin-compatible in 6-TSSOP packages.

Q: Can I use a higher current-rated substitute in a circuit designed for the FDG328P?

A: Yes, provided the package footprint is compatible and the circuit design does not depend on specific on-resistance or gate charge characteristics. Higher current-rated devices such as NTJS4151PT1G (3.3A) or PMG85XP,115 (2A) are electrically backward-compatible with the FDG328P (1.5A) in applications where current demand does not exceed the original specification. Lower on-resistance values in higher-rated devices result in reduced power dissipation, which is generally beneficial. Verify that gate drive voltage and switching frequency remain within device specifications.

Q: What package compatibility exists between these substitute parts?

A: All substitute parts are housed in 6-TSSOP/SC-88/SOT-363 surface mount packages, ensuring pin-compatible PCB footprints. The FDG328P, SI1403BDL-T1-GE3, PMG85XP,115, PMG85XPH, and NTJS4151PT1G all use identical package designations, allowing direct component substitution without PCB redesign.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts—SI1403BDL-T1-GE3, PMG85XP,115, PMG85XPH, and NTJS4151PT1G—are ROHS3 compliant, matching the FDG328P compliance status. MSL 1 (unlimited moisture sensitivity) is confirmed for FDG328P, SI1403BDL-T1-GE3, PMG85XPH, and NTJS4151PT1G.

Q: Which substitute offers the best thermal performance?

A: The NTJS4151PT1G provides the lowest on-resistance (60 mOhm at 4.5V) and highest power dissipation rating (1W), resulting in the lowest conduction losses and reduced junction temperature rise during operation. The PMG85XP,115 and PMG85XPH offer intermediate thermal performance with 115 mOhm on-resistance and 375 mW (Ta) / 2.4W (Tc) power dissipation ratings. The SI1403BDL-T1-GE3 provides moderate thermal performance with 150 mOhm on-resistance and 625 mW power dissipation.