FDMS7656AS N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The FDMS7656AS is an N-Channel MOSFET manufactured by onsemi, rated for 30V drain-to-source voltage with continuous drain current of 31A at Ta and 49A at Tc. This device is part of the PowerTrench® and SyncFET™ series and is housed in an 8-PQFN (5x6) surface mount package. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, supply chain considerations, or specific packaging preferences while maintaining electrical and mechanical compatibility within the defined parameter ranges.

Substiute Parts

FDMS7656AS

onsemiIn Stock: 18162FDMS7656AS Datasheet

Current PartRFQ

FDMS0300S

onsemiIn Stock: 18910FDMS0300S Datasheet

Parametric EquivalentRFQ

RS1E350BNTB

Rohm SemiconductorIn Stock: 3283RS1E350BNTB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FDMS7656AS are classified based on electrical parameter compatibility and packaging considerations. The substitution logic is determined by the following critical parameters:

Electrical Compatibility Criteria:

• Drain to Source Voltage (Vdss) must equal or exceed 30V
• Continuous drain current must meet or exceed 31A at Ta and 49A at Tc
• Rds On characteristics must be compatible with the application requirements
• Gate threshold voltage and gate charge must fall within acceptable operating ranges
• Operating temperature range must encompass -55°C to 150°C

Mechanical Compatibility Criteria:

• Surface mount technology requirement
• Package footprint compatibility (8-PQFN or equivalent pinout)
• RoHS3 compliance and MSL rating

Substitutes are grouped into two categories: parametric equivalents (identical electrical specifications with different packaging) and similar manufacturer parts (comparable electrical performance with minor parameter variations and different package types).

Parameter Comparison

Engineering Selection Recommendations

FDMS0300S (Parametric Equivalent): The FDMS0300S is a parametric equivalent to the FDMS7656AS, offering identical electrical specifications across all measured parameters. Both devices are manufactured by onsemi, operate within the same voltage and current ranges, and share the same 8-PQFN (5x6) package footprint. The primary distinction is the packaging format: FDMS0300S is supplied in Tape & Reel (TR) format, while FDMS7656AS is available in Cut Tape (CT) & Digi-Reel® format. Both parts maintain ROHS3 compliance and MSL 1 rating. Selection between these two should be based on packaging and supply chain requirements rather than electrical performance.

RS1E350BNTB (Similar Manufacturer Part): The RS1E350BNTB is manufactured by Rohm Semiconductor and provides comparable electrical performance with notable differences in specific parameters. This device exceeds the FDMS7656AS in continuous drain current (35A at Ta, 80A at Tc) and offers lower on-resistance (1.7 mOhm vs. 1.8 mOhm). However, the RS1E350BNTB utilizes an 8-HSOP package rather than the 8-PQFN format, requiring PCB layout modifications. Gate charge is higher at 185 nC compared to 133 nC, and power dissipation at Ta is increased to 3W. The RS1E350BNTB maintains ROHS3 compliance and MSL 1 rating. This substitute is suitable for applications where the larger package footprint is acceptable and enhanced current handling capability is beneficial.

All substitute parts maintain active product status and full regulatory compliance with ROHS3 and REACH requirements.

Frequently Asked Questions (FAQ)

Q: Can FDMS0300S be used as a direct replacement for FDMS7656AS?

A: Yes. The FDMS0300S is a parametric equivalent with identical electrical specifications. Both devices share the same 8-PQFN (5x6) package footprint, drain-to-source voltage, continuous drain current ratings, on-resistance, gate charge, and input capacitance. The only difference is the packaging format (Tape & Reel vs. Cut Tape & Digi-Reel®). No circuit modifications are required.

Q: What are the key differences between FDMS7656AS and RS1E350BNTB?

A: The RS1E350BNTB offers higher continuous drain current (35A at Ta vs. 31A) and lower on-resistance (1.7 mOhm vs. 1.8 mOhm). However, it uses an 8-HSOP package instead of 8-PQFN, requiring different PCB layout. Gate charge is higher (185 nC vs. 133 nC), and power dissipation at Ta is increased (3W vs. 2.5W). Both maintain 30V Vdss and -55 to 150°C operating range.

Q: Is the package change from 8-PQFN to 8-HSOP significant?

A: Yes. The 8-HSOP package has a different footprint and pin spacing compared to 8-PQFN (5x6). PCB layout modifications are required, including trace routing and thermal management adjustments. Verify footprint compatibility with your PCB design before substitution.

Q: Do all substitute parts meet the same compliance requirements?

A: Yes. FDMS0300S and RS1E350BNTB are both ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity rating. All parts are classified under ECCN EAR99 and HTSUS 8541.29.0095.

Q: Which substitute should I select for high-current applications?

A: The RS1E350BNTB supports higher continuous drain current (35A at Ta, 80A at Tc) compared to FDMS7656AS (31A at Ta, 49A at Tc). However, package compatibility must be verified. For identical package compatibility, FDMS0300S is the appropriate choice.

Q: Are there temperature range differences between the substitutes?

A: No. All three parts operate across the same temperature range of -55°C to 150°C (TJ). Temperature performance is equivalent across FDMS7656AS, FDMS0300S, and RS1E350BNTB.

Q: What is the impact of higher gate charge in RS1E350BNTB?

A: The RS1E350BNTB has gate charge of 185 nC at 10V compared to 133 nC for FDMS7656AS. Higher gate charge requires more energy to switch the device and may impact switching speed and driver requirements. Verify gate driver capability before substitution.