FDG327N Equivalent & Substitute Parts

Part Overview

The FDG327N is an N-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 (SC-88/SOT-363) surface mount package and is part of the PowerTrench® series. The FDG327N is classified as obsolete product status. Identification of equivalent and substitute parts is necessary due to the obsolete classification, which may result in limited availability or discontinuation of supply. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current capacity, and thermal characteristics while supporting the same surface mount packaging standard.

Substiute Parts

FDG327N

onsemiIn Stock: 71161FDG327N Datasheet

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NTJS3157NT1G

onsemiIn Stock: 1647NTJS3157NT1G Datasheet

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AO7408

Alpha & Omega Semiconductor Inc.In Stock: 4262AO7408 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDG327N is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

• Drain to Source Voltage (Vdss): Must equal or exceed 20V
• Continuous Drain Current (Id): Must equal or exceed 1.5A at 25°C
• Gate Threshold Voltage (Vgs(th)): Must be compatible with 1.5V @ 250µA specification
• Maximum Gate Voltage (Vgs): Must support ±8V operation
• Operating Temperature Range: Must span -55°C to 150°C (TJ)
• Package Type: Must be 6-TSSOP (SC-88/SOT-363) surface mount
• RoHS Compliance: Must maintain ROHS3 Compliant status

Acceptable Variation Parameters:

• Rds On (Max): Substitute values lower than 90 mOhm are acceptable
• Gate Charge (Qg): Substitute values may vary provided gate drive compatibility is maintained
• Input Capacitance (Ciss): Substitute values may vary within the specified voltage rating
• Power Dissipation (Max): Substitute values equal to or greater than 420mW are acceptable

The substitute parts NTJS3157NT1G and AO7408 meet all critical substitution parameters and are therefore electrically and mechanically compatible with the FDG327N.

Parameter Comparison

Engineering Selection Recommendations

NTJS3157NT1G (onsemi)

The NTJS3157NT1G is an active product from onsemi with enhanced electrical performance characteristics. This substitute provides 3.2A continuous drain current, exceeding the FDG327N requirement of 1.5A. The device maintains identical 20V Vdss rating and ±8V gate voltage specification. Rds On is reduced to 60 mOhm, providing improved efficiency. Gate threshold voltage is lowered to 1V, which may require gate drive circuit evaluation. Power dissipation capability is increased to 1W. The NTJS3157NT1G is ROHS3 compliant and maintains unlimited moisture sensitivity rating. This substitute is suitable for applications requiring higher current capacity or improved thermal performance within the same package footprint.

AO7408 (Alpha & Omega Semiconductor Inc.)

The AO7408 is an active product from Alpha & Omega Semiconductor Inc. with performance characteristics closely aligned to the FDG327N. This substitute provides 2A continuous drain current, exceeding the FDG327N requirement of 1.5A. The device maintains identical 20V Vdss rating and ±8V gate voltage specification. Rds On is reduced to 62 mOhm, providing improved efficiency. Gate threshold voltage is lowered to 1V. Power dissipation capability is 350mW, which is lower than the FDG327N at 420mW. The AO7408 is ROHS3 compliant and maintains unlimited moisture sensitivity rating. This substitute is suitable for applications with moderate current requirements and thermal constraints similar to the original design.

Both substitute parts are active products with established supply chains, addressing the obsolete status of the FDG327N. Selection between NTJS3157NT1G and AO7408 depends on application current requirements and thermal management considerations.

Frequently Asked Questions (FAQ)

Q: Can the NTJS3157NT1G replace the FDG327N in all applications?

A: The NTJS3157NT1G meets all critical electrical and mechanical substitution parameters. The higher continuous drain current (3.2A versus 1.5A) and lower gate threshold voltage (1V versus 1.5V) require evaluation of gate drive circuitry and current handling capacity in the specific application. The device is pin-compatible in the 6-TSSOP package.

Q: What is the primary difference between the AO7408 and NTJS3157NT1G substitutes?

A: Both devices maintain the 20V Vdss rating and 6-TSSOP package compatibility. The NTJS3157NT1G provides higher continuous drain current (3.2A) and power dissipation (1W), while the AO7408 provides moderate current capacity (2A) with lower power dissipation (350mW). The AO7408 more closely matches the original FDG327N power dissipation specification.

Q: Are the substitute parts available in the same package as the FDG327N?

A: Yes. Both NTJS3157NT1G and AO7408 are available in the 6-TSSOP (SC-88/SOT-363) surface mount package, identical to the FDG327N. No PCB layout modifications are required for package compatibility.

Q: Do the substitute parts maintain RoHS compliance?

A: Yes. Both NTJS3157NT1G and AO7408 are ROHS3 compliant with REACH Unaffected status, matching the environmental compliance profile of the FDG327N.

Q: What is the impact of lower gate threshold voltage in the substitute parts?

A: The NTJS3157NT1G and AO7408 have gate threshold voltage of 1V @ 250µA, compared to 1.5V @ 250µA for the FDG327N. This lower threshold may affect gate drive timing and switching characteristics. Gate drive circuit evaluation is necessary to ensure proper device operation within the application's voltage and frequency specifications.

Q: Can both substitute parts operate across the same temperature range as the FDG327N?

A: Yes. Both NTJS3157NT1G and AO7408 operate across the -55°C to 150°C (TJ) temperature range, identical to the FDG327N.

Q: What is the significance of the reduced Rds On in the substitute parts?

A: The lower Rds On values (60 mOhm for NTJS3157NT1G and 62 mOhm for AO7408, versus 90 mOhm for FDG327N) indicate improved on-state resistance. This results in lower conduction losses and reduced heat generation during operation, providing enhanced efficiency and thermal performance.

Q: Are there inventory considerations when selecting between the substitute parts?

A: The NTJS3157NT1G has 1634 units in stock, while the AO7408 has 4171 units in stock. Both represent active products with established supply availability, contrasting with the obsolete FDG327N status.