FDMS0310S N-Channel 30V MOSFET Equivalent & Substitute Parts

Part Overview

The FDMS0310S is an N-Channel 30V MOSFET manufactured by onsemi in the PowerTrench® and SyncFET™ series. This device is rated for 19A continuous drain current at 25°C (Ta) and 42A at case temperature (Tc), with a maximum on-resistance of 4mOhm at 18A and 10V gate-source voltage. The part is packaged in an 8-PQFN (5x6) surface mount configuration.

The FDMS0310S is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this MOSFET specification.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current @ 25°C (Ta)	19	A
Continuous Drain Current @ Case Temp (Tc)	42	A
On-Resistance (Rds On Max) @ 18A, 10V	4	mOhm
Gate-Source Voltage (Vgs Max)	±20	V
Gate Charge (Qg Max) @ 10V	46	nC
Input Capacitance (Ciss Max) @ 15V	2820	pF
Power Dissipation (Ta)	2.5	W
Power Dissipation (Tc)	46	W
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	-
Package	8-PQFN (5x6)	-
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the FDMS0310S is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Drain to Source Voltage (Vdss): Must equal or exceed 30V
Continuous Drain Current (Id @ 25°C): Must meet or exceed 19A at Ta
On-Resistance (Rds On): Must not exceed 4mOhm at rated current and 10V gate-source voltage
Gate-Source Voltage (Vgs): Must support ±20V maximum rating
Operating Temperature Range: Must support -55°C to 150°C junction temperature
Technology: N-Channel MOSFET (Metal Oxide)

Mechanical Compatibility Criteria:

Mounting Type: Surface Mount required
Package Classification: 8-pin power package configurations (8-PQFN, 8-HSOP, PG-TDSON-8-6)
Regulatory Compliance: ROHS3 Compliant, REACH Unaffected, MSL 1

Substitute Parts Identified:

BSC0503NSIATMA1 (Infineon Technologies) – Active product status, improved thermal performance
RS1E180BNTB (Rohm Semiconductor) – Active product status, higher current capability
RS1E200BNTB (Rohm Semiconductor) – Active product status, comparable specifications
RS1E200GNTB (Rohm Semiconductor) – Active product status, optimized gate charge

All substitute parts maintain the 30V Vdss rating, support ±20V Vgs, operate across the -55°C to 150°C temperature range, and comply with ROHS3 and REACH requirements.

Parameter Comparison

Parameter	FDMS0310S (onsemi)	BSC0503NSIATMA1 (Infineon)	RS1E180BNTB (Rohm)	RS1E200BNTB (Rohm)	RS1E200GNTB (Rohm)
Vdss	30V	30V	30V	30V	30V
Id @ 25°C (Ta)	19A	22A	—	20A	20A
Id @ Case Temp (Tc)	42A	88A	60A	68A	57A
Rds On (Max) @ 10V	4 mOhm @ 18A	3 mOhm @ 30A	4.9 mOhm @ 18A	3.9 mOhm @ 20A	4.6 mOhm @ 20A
Vgs(th) (Max) @ Id	3V @ 1mA	2V @ 250µA	2.5V @ 1mA	2.5V @ 1mA	2.5V @ 1mA
Gate Charge (Qg Max) @ 10V	46 nC	20 nC	46 nC	59 nC	16.8 nC
Input Capacitance (Ciss Max) @ 15V	2820 pF	1300 pF	2400 pF	3100 pF	1080 pF
Power Dissipation (Ta)	2.5W	2.5W	3W	3W	3W
Power Dissipation (Tc)	46W	36W	25W	25W	25W
Operating Temperature	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C
Vgs (Max)	±20V	±20V	±20V	±20V	±20V
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Product Status Consideration: The FDMS0310S is classified as obsolete. All four substitute parts (BSC0503NSIATMA1, RS1E180BNTB, RS1E200BNTB, RS1E200GNTB) maintain active product status with established supply chains and ongoing manufacturer support.

Regulatory Compliance: All substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance profile of the original FDMS0310S. All devices carry MSL 1 (Unlimited) moisture sensitivity rating, eliminating moisture-related handling constraints.

Electrical Performance: All substitute parts meet or exceed the 30V Vdss and 19A continuous drain current requirements of the FDMS0310S. The BSC0503NSIATMA1 offers superior on-resistance (3 mOhm) and reduced gate charge (20 nC), providing improved switching efficiency. The RS1E200GNTB provides the lowest input capacitance (1080 pF) and gate charge (16.8 nC), beneficial for high-frequency switching applications. The RS1E180BNTB delivers the highest case temperature current rating (60A Tc).

Package Compatibility: The FDMS0310S uses an 8-PQFN (5x6) package. Substitute parts employ alternative 8-pin surface mount packages (8-HSOP, PG-TDSON-8-6) that are mechanically and electrically compatible within standard PCB design practices. Pin configuration and functional equivalence are maintained across all substitutes.

Selection Guidance:

For applications prioritizing switching speed and efficiency: BSC0503NSIATMA1 or RS1E200GNTB
For applications requiring maximum current handling: RS1E180BNTB
For direct electrical equivalence with minimal design modification: RS1E200BNTB

Frequently Asked Questions (FAQ)

Q: Can the FDMS0310S be directly replaced with any of these substitute parts without PCB modification?

A: Electrical substitution is direct. However, package differences require PCB layout adjustment. The FDMS0310S uses 8-PQFN (5x6), while substitutes use 8-HSOP or PG-TDSON-8-6 packages. Footprint redesign is necessary. Pin functionality and electrical ratings remain compatible.

Q: What is the primary reason for substitution?

A: The FDMS0310S is obsolete. All substitute parts are active products with established supply availability and manufacturer support, ensuring long-term design sustainability.

Q: Are all substitute parts suitable for the same current levels?

A: All substitutes meet or exceed the 19A continuous drain current (Ta) specification. At case temperature (Tc), substitutes provide 57A to 88A, exceeding the original 42A rating. Design thermal management should account for these higher ratings.

Q: Do the substitute parts require different gate drive voltages?

A: No. All substitute parts support the same ±20V maximum gate-source voltage as the FDMS0310S. Gate threshold voltages are comparable (2V to 3V), ensuring compatible gate drive circuits.

Q: Which substitute offers the best thermal performance?

A: The BSC0503NSIATMA1 provides the lowest on-resistance (3 mOhm at 30A, 10V) and highest case temperature current rating (88A Tc), resulting in reduced power dissipation and improved thermal efficiency.

Q: Are moisture sensitivity requirements the same across all parts?

A: Yes. The FDMS0310S and all substitute parts carry MSL 1 (Unlimited) rating, eliminating moisture-related storage and handling constraints.

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

A: Gate charge differences (16.8 nC to 59 nC) affect gate drive current requirements and switching speed. Lower gate charge (RS1E200GNTB: 16.8 nC) reduces driver power consumption and enables faster switching. Higher gate charge (RS1E200BNTB: 59 nC) requires proportionally higher gate drive current but maintains switching performance within standard driver specifications.

Q: Can these parts be used interchangeably in existing designs?

A: Electrical interchangeability is confirmed. PCB footprint redesign is mandatory due to package differences. Thermal design review is recommended to optimize performance with the improved current ratings of substitute parts.

Q: Are all substitute parts available in the same packaging formats?

A: The FDMS0310S is available in Cut Tape (CT) and Digi-Reel® formats. Substitute parts are available in Tape & Reel (TR) or Cut Tape (CT) formats. Packaging format availability should be confirmed with suppliers based on production volume requirements.

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