FDMS8672S N-Channel 30V 17A/35A MOSFET Equivalent & Substitute Parts

Part Overview

The FDMS8672S is an N-Channel 30V MOSFET manufactured by onsemi in the PowerTrench® series, rated for 17A continuous drain current at 25°C (Ta) and 35A at case temperature (Tc). The device is housed in an 8-PQFN (5x6) surface mount package with a maximum on-resistance of 5mOhm at 17A and 10V gate-source voltage. This part is currently obsolete, making equivalent and substitute components necessary for new designs and ongoing production support.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current @ 25°C (Ta)	17	A
Continuous Drain Current @ Case Temp (Tc)	35	A
On-Resistance (Rds On) Max @ 17A, 10V	5	mOhm
Gate Threshold Voltage (Vgs(th)) @ 1mA	3	V
Gate Charge (Qg) @ 10V	47	nC
Input Capacitance (Ciss) @ 15V	2515	pF
Power Dissipation (Ta)	2.5	W
Power Dissipation (Tc)	50	W
Operating Temperature Range	-55 to 150	°C
Package Type	8-PQFN (5x6)	-
Mounting Type	Surface Mount	-

Substitute Part Grouping Explanation

Substitution of the FDMS8672S is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain to Source Voltage (Vdss): 30V minimum
Continuous Drain Current (Ta): 17A minimum
On-Resistance (Rds On): 5mOhm or lower at rated conditions
Gate Threshold Voltage (Vgs(th)): Compatible with 3V nominal
Package Type: 8-pin surface mount with compatible footprint
Operating Temperature Range: -55°C to 150°C minimum
Mounting Type: Surface Mount

Substitute parts are grouped into two categories based on compatibility:

Category 1 - Direct Electrical Equivalents (Same Vdss, Similar Current Ratings): Parts maintaining 30V Vdss rating with continuous drain current at or above 17A (Ta) and on-resistance specifications compatible with the original design.

Category 2 - Functional Alternatives (30V Vdss, Enhanced Performance): Parts with 30V Vdss rating and higher current handling capability (Tc ratings above 35A), suitable for designs requiring thermal margin or higher peak current capacity while maintaining the same voltage class.

Excluded from Substitution: Parts with Vdss below 30V (such as CSD16404Q5A at 25V) are not direct substitutes due to reduced voltage headroom, though they may be considered for applications with lower voltage requirements.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ Ta (A)	Id @ Tc (A)	Rds On Max (mOhm)	Vgs(th) (V)	Qg @ 10V (nC)	Ciss @ 15V (pF)	Package	Status
FDMS8672S	onsemi	30	17	35	5.0	3.0	47	2515	8-PQFN (5x6)	Obsolete
FDMS0312AS	onsemi	30	18	22	5.0	3.0	31	1815	8-PQFN (5x6)	Active
BSC042N03MSGATMA1	Infineon	30	17	93	4.2	2.0	55	4300	PG-TDSON-8-5	Active
BSC057N03LSGATMA1	Infineon	30	17	71	5.7	2.2	30	2400	PG-TDSON-8-5	Obsolete
BSC050N03LSGATMA1	Infineon	30	18	80	5.0	2.2	35	2800	PG-TDSON-8-5	Active
BSZ050N03MSGATMA1	Infineon	30	15	40	4.5	2.0	46	3600	PG-TSDSON-8	Active
CSD16404Q5A	Texas Instruments	25	21	81	5.1	2.1	8.5	1220	8-VSONP (5x6)	Active
CSD17310Q5A	Texas Instruments	30	21	100	5.1	1.8	11.6	1560	8-VSONP (5x6)	Active
CSD17506Q5A	Texas Instruments	30	—	100	4.0	1.8	11	1650	8-VSONP (5x6)	Active
CSD17510Q5A	Texas Instruments	30	20	100	5.2	2.1	8.3	1250	8-VSONP (5x6)	Active
CSD17577Q5A	Texas Instruments	30	60	—	4.2	1.8	35	2310	8-VSONP (5x6)	Active

Engineering Selection Recommendations

Primary Recommendation - onsemi FDMS0312AS: The FDMS0312AS is the closest functional equivalent to the FDMS8672S. Both devices are manufactured by onsemi in the PowerTrench® series with identical 30V Vdss rating and 8-PQFN (5x6) package footprint. The FDMS0312AS is currently in Active product status, ensuring long-term availability. The continuous drain current at Ta is 18A, exceeding the original 17A specification. On-resistance is identical at 5.0mOhm. The primary difference is reduced gate charge (31nC vs. 47nC) and lower input capacitance (1815pF vs. 2515pF), which may improve switching performance in certain applications. RoHS3 compliance is confirmed.

Secondary Recommendation - Infineon BSC050N03LSGATMA1: The BSC050N03LSGATMA1 provides a 30V Vdss equivalent with 18A continuous drain current at Ta and 80A at Tc, offering significant thermal margin. The device is housed in PG-TDSON-8-5 package, which is mechanically compatible with 8-pin surface mount layouts but requires PCB footprint verification. On-resistance is 5.0mOhm at 30A and 10V. Active product status and RoHS3 compliance are confirmed. This part is suitable for designs requiring enhanced thermal performance.

Alternative Recommendation - Texas Instruments CSD17310Q5A: The CSD17310Q5A is a 30V NexFET™ device with 21A continuous drain current at Ta and 100A at Tc. The 8-VSONP (5x6) package is mechanically similar to the original 8-PQFN footprint. On-resistance is 5.1mOhm at 20A and 8V. Lower gate threshold voltage (1.8V vs. 3.0V) and reduced gate charge (11.6nC vs. 47nC) enable faster switching. Active product status and RoHS3 compliance are confirmed. This part is suitable for high-performance applications where switching speed is critical.

Not Recommended - CSD16404Q5A: The CSD16404Q5A has a reduced Vdss rating of 25V, which is below the 30V specification of the original part. This voltage reduction limits design margin and is not suitable as a direct substitute.

Not Recommended - BSC057N03LSGATMA1: Although this part meets electrical specifications, it is currently in Obsolete product status, making it unsuitable for long-term production support.

Frequently Asked Questions (FAQ)

Q: Can the FDMS0312AS be used as a direct replacement for the FDMS8672S?

A: Yes. Both parts share identical 30V Vdss rating, 8-PQFN (5x6) package footprint, and on-resistance specification of 5.0mOhm. The FDMS0312AS has a slightly higher continuous drain current (18A vs. 17A) and lower gate charge, making it functionally compatible. The FDMS0312AS is in Active product status, ensuring availability.

Q: What is the difference between the 8-PQFN and PG-TDSON-8-5 packages?

A: Both are 8-pin surface mount packages with similar thermal performance characteristics. The 8-PQFN (5x6) is the original package for the FDMS8672S. The PG-TDSON-8-5 used by Infineon parts has comparable dimensions and pin configuration but requires verification of PCB footprint compatibility before implementation. Consult package datasheets for exact land pattern specifications.

Q: Why do some substitute parts have lower gate threshold voltage (Vgs(th))?

A: Gate threshold voltage varies by manufacturer and process technology. Parts with lower Vgs(th) (such as 1.8V vs. 3.0V) require lower gate drive voltage for full enhancement but may be more susceptible to parasitic turn-on. Verify gate drive circuit compatibility with the selected substitute part's Vgs(th) specification.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended substitute parts (FDMS0312AS, BSC050N03LSGATMA1, CSD17310Q5A, CSD17506Q5A, CSD17510Q5A, CSD17577Q5A) are confirmed RoHS3 compliant. BSC057N03LSGATMA1 is RoHS3 compliant but is Obsolete. CSD16404Q5A is RoHS3 compliant but has reduced Vdss rating.

Q: What is the significance of gate charge (Qg) differences between parts?

A: Gate charge determines the energy required to switch the MOSFET on and off. Lower gate charge (such as 11.6nC in CSD17310Q5A vs. 47nC in FDMS8672S) reduces switching losses and allows faster switching speeds with lower gate drive current. Higher gate charge may require higher gate drive capability but typically indicates lower on-resistance or higher current handling.

Q: Can I use CSD17506Q5A if my application only requires 17A continuous current?

A: Yes. The CSD17506Q5A is rated for 100A at Tc and has on-resistance of 4.0mOhm at 20A and 10V, which exceeds the performance of the original FDMS8672S. However, verify that the 8-VSONP (5x6) package footprint is compatible with your PCB layout. The lower on-resistance may reduce power dissipation in your application.

Q: What is the impact of using a part with higher Tc current rating?

A: Parts with higher Tc ratings (such as 80A or 100A) provide greater thermal margin and lower junction temperature rise under the same current load. This extends device lifetime and improves reliability. There is no negative impact on applications requiring lower current; the device simply operates with reduced thermal stress.

Q: Is the BSZ050N03MSGATMA1 suitable as a substitute?

A: The BSZ050N03MSGATMA1 has a 30V Vdss rating and 15A continuous drain current at Ta, which is slightly below the original 17A specification. The PG-TSDSON-8 package differs from the original 8-PQFN footprint. While electrically compatible in voltage class, the lower current rating and different package make it a secondary choice. The part is in Active product status.

Q: What compliance certifications should I verify before selecting a substitute?

A: Verify RoHS3 compliance, REACH status, and product status (Active vs. Obsolete). All recommended substitutes are RoHS3 compliant and REACH Unaffected or REACH Affected as noted. Confirm that the selected part's compliance status meets your application and regional requirements.

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