FDMS0308CS N-Channel 30V 22A MOSFET Equivalent & Substitute Parts

Part Overview

The FDMS0308CS is an N-Channel MOSFET manufactured by onsemi, rated for 30V drain-to-source voltage with 22A continuous drain current at 25°C. The device is housed in an 8-PQFN (5x6) surface mount package and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute devices maintain the core electrical specifications while offering improved availability and active product support from manufacturers including Infineon Technologies and Texas Instruments.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain-to-Source Voltage (Vdss)	30	V
Continuous Drain Current @ 25°C (Ta)	22	A
RDS(on) Max @ Id, Vgs	3 mOhm @ 21A, 10V	—
Gate Threshold Voltage (Vgs(th)) Max	3	V @ 1mA
Gate Charge (Qg) Max @ Vgs	66	nC @ 10V
Input Capacitance (Ciss) Max @ Vds	4225	pF @ 15V
Power Dissipation Max (Ta)	2.5	W
Operating Temperature Range	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package	8-PowerTDFN	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the FDMS0308CS are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Drain-to-Source Voltage (Vdss): 30V (exact match required)
Continuous Drain Current @ 25°C: 22A minimum at Ta rating
Package Type: 8-PowerTDFN surface mount configuration
Operating Temperature Range: -55°C to 150°C (TJ)
Mounting Type: Surface Mount

Secondary Compatibility Parameters:

RDS(on) characteristics within acceptable range for application
Gate charge and input capacitance for switching performance
Power dissipation capability at Ta and Tc ratings
Moisture Sensitivity Level: MSL 1 (Unlimited)

Substitute parts are classified into two categories:

Direct Substitutes: Parts meeting all critical parameters with equivalent or superior electrical performance at the specified 22A Ta rating. These include BSC034N03LSGATMA1 and BSC0503NSIATMA1 from Infineon Technologies, and CSD17501Q5A from Texas Instruments.

Similar Substitutes: Parts meeting critical voltage and package requirements with comparable or enhanced current ratings and thermal performance. These include BSC030N03LSGATMA1, BSC030N03MSGATMA1, CSD17301Q5A, CSD17305Q5A, and CSD17306Q5A. These devices offer active product status and improved thermal characteristics while maintaining functional compatibility.

Parameter Comparison

Parameter	FDMS0308CS (onsemi)	BSC034N03LSGATMA1 (Infineon)	BSC0503NSIATMA1 (Infineon)	CSD17301Q5A (TI)	CSD17305Q5A (TI)	CSD17306Q5A (TI)	CSD17501Q5A (TI)
Vdss	30V	30V	30V	30V	30V	30V	30V
Id @ 25°C (Ta)	22A	22A	22A	28A	29A	24A	—
Id @ 25°C (Tc)	—	100A	88A	100A	100A	100A	100A
RDS(on) Max @ Id, Vgs	3 mOhm @ 21A, 10V	3.4 mOhm @ 30A, 10V	3 mOhm @ 30A, 10V	2.6 mOhm @ 25A, 8V	3.4 mOhm @ 30A, 8V	3.7 mOhm @ 22A, 8V	2.9 mOhm @ 25A, 10V
Vgs(th) Max @ Id	3V @ 1mA	2.2V @ 250µA	2V @ 250µA	1.55V @ 250µA	1.6V @ 250µA	1.6V @ 250µA	1.8V @ 250µA
Qg Max @ Vgs	66 nC @ 10V	52 nC @ 10V	20 nC @ 10V	25 nC @ 4.5V	18.3 nC @ 4.5V	15.3 nC @ 4.5V	17 nC @ 4.5V
Ciss Max @ Vds	4225 pF @ 15V	4300 pF @ 15V	1300 pF @ 15V	3480 pF @ 15V	2600 pF @ 15V	2170 pF @ 15V	2630 pF @ 15V
Power Dissipation Max (Ta)	2.5W	2.5W	2.5W	3.2W	3.1W	3.2W	3.2W
Operating Temperature	-55 to 150°C (TJ)	-55 to 150°C (TJ)	-55 to 150°C (TJ)	-55 to 150°C (TJ)	-55 to 150°C (TJ)	-55 to 150°C (TJ)	-55 to 150°C (TJ)
Package	8-PowerTDFN	8-PowerTDFN	8-PowerTDFN	8-PowerTDFN	8-PowerTDFN	8-PowerTDFN	8-PowerTDFN
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

For Direct Substitution (Equivalent Performance):

BSC034N03LSGATMA1 (Infineon OptiMOS™) and BSC0503NSIATMA1 (Infineon OptiMOS™) are direct substitutes meeting the 22A Ta specification with 30V Vdss rating. Both devices are ROHS3 compliant and carry active product status. BSC034N03LSGATMA1 provides 100A Tc rating with 57W power dissipation at Tc, while BSC0503NSIATMA1 provides 88A Tc rating with 36W power dissipation at Tc. Both are packaged in 8-PowerTDFN configuration with MSL 1 (Unlimited) moisture sensitivity rating.

For Enhanced Performance Substitution:

CSD17501Q5A (Texas Instruments NexFET™) offers superior electrical characteristics with 2.9 mOhm RDS(on) at 25A, 10V and 100A Tc rating. This device is ROHS3 compliant with active product status. CSD17306Q5A (Texas Instruments NexFET™) provides 24A Ta rating with 3.7 mOhm RDS(on) at 22A, 8V and 100A Tc rating, also ROHS3 compliant and active.

For Similar Performance with Enhanced Thermal Capability:

BSC030N03LSGATMA1 and BSC030N03MSGATMA1 (Infineon OptiMOS™) provide 23A and 21A Ta ratings respectively with 100A Tc rating and 69W power dissipation at Tc. Both are ROHS3 compliant and active. CSD17301Q5A and CSD17305Q5A (Texas Instruments NexFET™) provide 28A and 29A Ta ratings with 100A Tc rating, ROHS3 compliant and active.

All substitute parts maintain the -55°C to 150°C operating temperature range, MSL 1 (Unlimited) moisture sensitivity, REACH Unaffected status, and EAR99 ECCN classification of the original FDMS0308CS device.

Frequently Asked Questions (FAQ)

Q: Can BSC034N03LSGATMA1 directly replace FDMS0308CS in existing designs?

A: Yes. BSC034N03LSGATMA1 meets the critical electrical specifications: 30V Vdss, 22A Ta rating, and 8-PowerTDFN package. The device is ROHS3 compliant and carries active product status. Pin configuration and package footprint are compatible with the original FDMS0308CS.

Q: What is the difference between the Infineon and Texas Instruments substitute options?

A: Infineon OptiMOS™ devices (BSC034N03LSGATMA1, BSC0503NSIATMA1, BSC030N03LSGATMA1, BSC030N03MSGATMA1) maintain specifications closely aligned to the original FDMS0308CS with 22A Ta ratings. Texas Instruments NexFET™ devices (CSD17301Q5A, CSD17305Q5A, CSD17306Q5A, CSD17501Q5A) offer enhanced current ratings (24A to 100A Ta) and lower gate charge characteristics. Both families are ROHS3 compliant and active.

Q: Are there packaging differences between substitute parts?

A: All substitute parts use the 8-PowerTDFN surface mount package, maintaining mechanical compatibility with FDMS0308CS. Packaging options vary by supplier: Infineon devices are available in Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel®; Texas Instruments devices are available in Cut Tape (CT) & Digi-Reel® or Tape & Reel (TR). Consult supplier documentation for specific packaging availability.

Q: Which substitute offers the lowest on-resistance?

A: CSD17501Q5A provides 2.9 mOhm RDS(on) at 25A, 10V, the lowest among all substitutes. CSD17301Q5A provides 2.6 mOhm RDS(on) at 25A, 8V. Both are Texas Instruments NexFET™ devices with active product status and ROHS3 compliance.

Q: Is gate charge an important consideration for substitution?

A: Gate charge affects switching speed and driver requirements. The original FDMS0308CS specifies 66 nC @ 10V. Substitute devices range from 15.3 nC to 52 nC, generally lower than the original. Lower gate charge reduces switching losses and driver power consumption. Verify driver compatibility with the selected substitute device specifications.

Q: What is the thermal performance difference between substitutes?

A: Power dissipation at Ta (25°C) ranges from 2.5W to 3.2W across all devices. At Tc (case temperature), Infineon devices provide 36W to 69W dissipation, while Texas Instruments devices specify 3.1W to 3.2W at Ta. Thermal performance depends on PCB design, heatsinking, and application duty cycle. Consult thermal models in device datasheets for specific applications.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 Compliant status. The original FDMS0308CS does not specify RoHS status. All substitutes maintain REACH Unaffected status and EAR99 ECCN classification.

Q: What is the moisture sensitivity level for substitute parts?

A: All substitute parts carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original FDMS0308CS specification. This indicates unlimited shelf life under controlled storage conditions.

Q: Can CSD17501Q5A be used as a drop-in replacement despite higher current rating?

A: Yes. CSD17501Q5A is electrically and mechanically compatible with FDMS0308CS. The 100A Tc rating exceeds the original 22A Ta requirement, providing design margin. The device maintains 30V Vdss, 8-PowerTDFN package, and -55°C to 150°C operating range. Verify gate drive compatibility due to lower gate charge (17 nC @ 4.5V vs. 66 nC @ 10V).

Q: Which substitute offers the best inventory availability?

A: CSD17501Q5A has the highest inventory level at 30,400 pieces. BSC030N03MSGATMA1 has 11,656 pieces. BSC034N03LSGATMA1 has 786 pieces. Inventory levels are subject to change; consult current supplier data for real-time availability.

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