FDG314P Equivalent & Substitute Parts

Part Overview

The FDG314P is a P-Channel MOSFET manufactured by onsemi, designed for surface mount applications in the SC-88 (SC-70-6) package. This device operates at 25V drain-to-source voltage with a continuous drain current rating of 650mA and maximum power dissipation of 750mW. The FDG314P is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity.

Substiute Parts

FDG314P

onsemiIn Stock: 17121FDG314P Datasheet

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NTJS4151PT1G

onsemiIn Stock: 143433NTJS4151PT1G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDG314P is determined by the following critical parameters:

Package Compatibility: The substitute must use the SC-88/SC-70-6/SOT-363 surface mount package to ensure mechanical and electrical compatibility with existing PCB layouts.

Channel Type: The substitute must be a P-Channel MOSFET to maintain circuit functionality and polarity requirements.

Voltage Rating: The substitute's Vdss rating must be equal to or greater than the FDG314P's 25V specification to ensure safe operation under maximum voltage conditions.

Current Capability: The substitute's continuous drain current (Id) must meet or exceed the 650mA requirement of the FDG314P to support the intended load.

On-Resistance Characteristics: The substitute's Rds On must be compatible with the FDG314P's 1.1Ω specification to maintain switching efficiency and thermal performance.

Operating Temperature Range: The substitute must support the full -55°C to 150°C operating temperature range.

Gate Voltage Compatibility: The substitute's maximum gate voltage (Vgs Max) must accommodate the drive voltage levels used in the original circuit.

The NTJS4151PT1G meets these substitution criteria while offering enhanced performance characteristics in an active product status.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The FDG314P is classified as obsolete, while the NTJS4151PT1G maintains active product status with onsemi. Active status ensures continued availability, manufacturing support, and compliance with current industry standards.

Compliance and Certifications: Both devices are REACH Unaffected and classified under ECCN EAR99. The NTJS4151PT1G carries RoHS3 Compliant certification, providing additional environmental compliance assurance for new designs and procurement.

Substitution Feasibility: The NTJS4151PT1G is a direct substitute for the FDG314P in applications where the drain-to-source voltage requirement does not exceed 20V. The lower Vdss rating of the NTJS4151PT1G (20V versus 25V) requires verification that circuit maximum voltages remain within this specification.

Performance Enhancement: The NTJS4151PT1G offers superior electrical characteristics including higher continuous drain current (3.3A versus 650mA), lower on-resistance (60mΩ versus 1.1Ω), and higher power dissipation rating (1W versus 750mW). These enhancements provide improved thermal performance and reduced power loss in switching applications.

Gate Drive Compatibility: The NTJS4151PT1G accepts gate voltages up to ±12V compared to the FDG314P's ±8V maximum. This expanded gate voltage range accommodates a broader range of driver circuits. However, the higher input capacitance (850pF versus 63pF) may require adjustment of gate drive timing in high-frequency applications.

Inventory and Supply: The NTJS4151PT1G is available in significantly higher quantities (143,400 pieces) compared to the FDG314P (17,100 pieces), supporting long-term procurement requirements.

Frequently Asked Questions (FAQ)

Q: Can the NTJS4151PT1G directly replace the FDG314P in all applications?

A: The NTJS4151PT1G is a functional substitute provided the circuit maximum drain-to-source voltage does not exceed 20V. The FDG314P is rated for 25V operation. Applications operating at voltages between 20V and 25V require circuit redesign or voltage limiting measures to use the NTJS4151PT1G.

Q: What is the significance of the lower on-resistance in the NTJS4151PT1G?

A: The NTJS4151PT1G on-resistance of 60mΩ (at 3.3A, 4.5V) compared to the FDG314P's 1.1Ω (at 500mA, 4.5V) results in lower power dissipation during conduction. This reduces thermal load on the device and surrounding circuitry, improving overall system efficiency.

Q: Are the packages physically identical?

A: Both devices use the SC-88/SC-70-6/SOT-363 package family. The 6-pin surface mount configuration is identical, allowing direct PCB layout compatibility without redesign.

Q: How does the higher input capacitance of the NTJS4151PT1G affect circuit performance?

A: The NTJS4151PT1G input capacitance of 850pF (versus 63pF for the FDG314P) increases gate charge requirements and may extend switching transition times. High-frequency switching applications operating above 1MHz may require gate driver circuit optimization to maintain switching speed.

Q: What is the impact of the higher gate charge specification?

A: The NTJS4151PT1G gate charge of 10nC (versus 1.5nC for the FDG314P) requires greater charge delivery from the gate driver circuit. Gate driver circuits must supply sufficient current to charge the gate within the required switching time window.

Q: Is the NTJS4151PT1G suitable for battery-powered applications?

A: The NTJS4151PT1G's lower on-resistance and higher current capability make it suitable for battery-powered applications where efficiency is critical. The reduced conduction losses minimize battery drain compared to the FDG314P.

Q: What compliance advantages does the NTJS4151PT1G offer?

A: The NTJS4151PT1G carries RoHS3 Compliant certification, ensuring compliance with current environmental regulations. Both devices are REACH Unaffected, providing regulatory certainty for procurement and use.

Q: Can the NTJS4151PT1G be used in circuits designed for the FDG314P without PCB modifications?

A: Yes, the identical SC-88/SC-70-6/SOT-363 package allows direct PCB compatibility. However, circuit analysis is required to confirm that maximum drain-to-source voltage does not exceed 20V and that gate drive circuits can accommodate the higher input capacitance.