FDMS3016DC N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The FDMS3016DC is an N-Channel 30V MOSFET manufactured by onsemi, featuring the Dual Cool™ and PowerTrench® technology series. This device is rated for 18A continuous drain current (Ta) and 49A (Tc) with a maximum drain-to-source voltage of 30V. The part is housed in an 8-PQFN (5x6) surface mount package and is currently classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current @ 25°C (Ta)	18	A
Continuous Drain Current @ 25°C (Tc)	49	A
RDS(on) Max @ Id, Vgs	6	mOhm @ 12A, 10V
Gate Threshold Voltage (Vgs(th)) Max	3	V @ 250µA
Gate Charge (Qg) Max	23	nC @ 10V
Input Capacitance (Ciss) Max	1385	pF @ 15V
Power Dissipation Max (Ta)	3.3	W
Power Dissipation Max (Tc)	60	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package Type	8-PQFN (5x6)	Surface Mount
FET Type	N-Channel	MOSFET

Substitute Part Grouping Explanation

Substitution of the FDMS3016DC is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain to Source Voltage (Vdss): Must be ≥30V
Continuous Drain Current (Id @ Ta): Must be ≥18A
Continuous Drain Current (Id @ Tc): Must be ≥49A
RDS(on) Max: Must be ≤6mOhm or equivalent thermal performance
Gate Threshold Voltage (Vgs(th)): Must be ≤3V
Operating Temperature Range: Must support -55°C to 150°C minimum
Package Type: Surface mount 8-pin configurations (PQFN, HSOP, DFN, VSON variants acceptable)
FET Type: N-Channel MOSFET technology

Secondary Compatibility Factors:

Gate Charge (Qg): Lower values preferred for faster switching
Input Capacitance (Ciss): Lower values preferred for reduced gate drive requirements
Power Dissipation capability: Must support thermal requirements of application

Substitute parts are grouped into two categories: Direct Equivalents (matching all primary criteria within tolerance) and Similar Alternatives (meeting primary criteria with acceptable trade-offs in secondary parameters).

Parameter Comparison

Parameter	FDMS3016DC (Main)	RS1E170GNTB	AON6414AL	CSD17552Q5A	CSD18503Q5A	STL66N3LLH5
Manufacturer	onsemi	Rohm Semiconductor	Alpha & Omega Semiconductor	Texas Instruments	Texas Instruments	STMicroelectronics
Vdss (V)	30	30	30	30	40	30
Id @ Ta (A)	18	17	13	17	19	—
Id @ Tc (A)	49	40	30	60	100	80
RDS(on) Max (mOhm)	6 @ 12A, 10V	6.7 @ 17A, 10V	8 @ 20A, 10V	6.2 @ 15A, 10V	4.3 @ 22A, 10V	5.8 @ 10.5A, 10V
Vgs(th) Max (V)	3 @ 250µA	2.5 @ 1mA	2.5 @ 250µA	1.9 @ 250µA	2.3 @ 250µA	3 @ 250µA
Qg Max (nC)	23 @ 10V	12 @ 10V	24 @ 10V	12 @ 4.5V	32 @ 10V	12 @ 4.5V
Ciss Max (pF)	1385 @ 15V	720 @ 15V	1380 @ 15V	2050 @ 15V	2640 @ 20V	1500 @ 25V
Power Dissipation Ta (W)	3.3	3	2.3	3	3.1	—
Power Dissipation Tc (W)	60	23	31	—	120	72
Operating Temperature (°C)	-55 to 150	to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 175
Package Type	8-PQFN (5x6)	8-HSOP	8-DFN (5x6)	8-VSONP (5x6)	8-VSONP (5x6)	PowerFlat™ (5x6)
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent Substitutes:

CSD17552Q5A (Texas Instruments NexFET™ Series) is the primary recommended substitute. This part meets or exceeds all primary electrical criteria with Vdss of 30V, Id(Ta) of 17A, and Id(Tc) of 60A. The RDS(on) of 6.2mOhm is comparable to the main part. The device is in active production status with ROHS3 compliance and maintains the same operating temperature range. The 8-VSONP (5x6) package is mechanically compatible with the original 8-PQFN footprint.

RS1E170GNTB (Rohm Semiconductor) provides a close electrical match with 30V Vdss, 17A Id(Ta), and 40A Id(Tc). RDS(on) of 6.7mOhm is within acceptable tolerance. This part is active and ROHS3 compliant. The 8-HSOP package requires PCB layout verification for compatibility.

Alternative Substitutes with Enhanced Performance:

CSD18503Q5A (Texas Instruments NexFET™ Series) offers higher voltage rating (40V Vdss) and superior current handling (19A Ta, 100A Tc) with lower RDS(on) of 4.3mOhm. This part is suitable for applications requiring higher voltage margin or improved thermal performance. ROHS3 compliant and active production status.

STL66N3LLH5 (STMicroelectronics STripFET™ V Series) provides 30V Vdss with exceptional current capability (80A Tc) and low RDS(on) of 5.8mOhm. This automotive-qualified part (AEC-Q101) extends operating temperature to 175°C and is suitable for high-reliability applications. Active production status with ROHS3 compliance.

AON6414AL (Alpha & Omega Semiconductor) meets 30V Vdss requirement with 13A Ta and 30A Tc ratings. This part is suitable for lower current applications or as a cost-optimized alternative. Active production status with ROHS3 compliance.

All recommended substitutes are in active production status, eliminating obsolescence risk associated with the original FDMS3016DC.

Frequently Asked Questions (FAQ)

Q: Can I use CSD18503Q5A as a direct replacement for FDMS3016DC?

A: CSD18503Q5A is electrically compatible but operates at 40V Vdss versus the original 30V. This higher voltage rating is acceptable for 30V applications and provides additional design margin. The part exceeds current requirements (19A Ta, 100A Tc versus 18A Ta, 49A Tc) and offers superior RDS(on) performance. Package compatibility requires PCB layout verification.

Q: What is the difference between Ta and Tc current ratings?

A: Ta represents continuous drain current at ambient temperature (25°C), while Tc represents continuous drain current at case temperature. Tc ratings are typically higher due to improved thermal conditions at the device case. Selection should be based on the thermal environment of the specific application.

Q: Are all substitute parts RoHS compliant?

A: Yes. All active substitute parts listed (RS1E170GNTB, AON6414AL, CSD17552Q5A, CSD18503Q5A, and STL66N3LLH5) are ROHS3 compliant, meeting environmental and regulatory requirements for new designs.

Q: Can I use STL66N3LLH5 in a non-automotive application?

A: Yes. STL66N3LLH5 is automotive-qualified (AEC-Q101) but is suitable for any application. The automotive qualification indicates higher reliability standards and extended temperature range (-55°C to 175°C), making it appropriate for demanding non-automotive applications as well.

Q: What package considerations should I evaluate?

A: The original FDMS3016DC uses 8-PQFN (5x6). Substitute parts use 8-HSOP, 8-DFN, 8-VSONP, or PowerFlat™ packages. While all are 8-pin surface mount devices in similar physical dimensions, PCB footprint and thermal via placement differ. Verify PCB layout compatibility before design implementation.

Q: Which substitute offers the best thermal performance?

A: CSD18503Q5A and STL66N3LLH5 provide the highest power dissipation ratings (120W Tc and 72W Tc respectively) and lowest RDS(on) values, resulting in superior thermal performance. Selection depends on specific thermal requirements and package compatibility with your PCB design.

Q: Is gate charge (Qg) an important consideration for substitution?

A: Gate charge affects switching speed and gate drive circuit requirements. Substitute parts show varying Qg values (12 to 32 nC). Lower gate charge enables faster switching and reduces gate drive power. If your design uses a fixed gate drive circuit, verify that the substitute's Qg is compatible with your driver specifications.

Q: Can I substitute AON6414AL if my application requires lower current?

A: Yes. AON6414AL is suitable for applications requiring 13A Ta or lower. However, if your design requires the full 18A Ta capability of the original part, AON6414AL is not recommended as it does not meet the minimum current requirement.

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