FDMS0309AS_SN00347 Equivalent & Substitute Parts

Part Overview

The FDMS0309AS_SN00347 is an N-Channel MOSFET manufactured by onsemi, rated for 30V drain-to-source voltage with continuous drain current of 21A at Ta and 49A at Tc. This device is housed in an 8-PQFN (5x6) surface mount package and belongs to the PowerTrench® and SyncFET™ series. The part is currently classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Technology	MOSFET (Metal Oxide)	—
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current @ 25°C (Ta)	21	A
Continuous Drain Current @ 25°C (Tc)	49	A
Rds On (Max) @ 21A, 10V	3.5	mOhm
Vgs(th) (Max) @ 1mA	3	V
Gate Charge (Qg) @ 10V	47	nC
Input Capacitance (Ciss) @ 15V	3000	pF
Power Dissipation (Ta)	2.5	W
Power Dissipation (Tc)	50	W
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package	8-PQFN (5x6)	—

Substitute Part Grouping Explanation

Substitution of the FDMS0309AS_SN00347 is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Drain-to-source voltage rating (Vdss) must equal or exceed 30V
Continuous drain current at Ta must meet or exceed 21A
Gate threshold voltage (Vgs(th)) must be compatible with 3V specification
On-state resistance (Rds On) must not exceed 3.5mOhm at rated conditions
Gate charge (Qg) and input capacitance (Ciss) must remain within acceptable switching performance ranges
Operating temperature range must encompass -55°C to 150°C

Mechanical Compatibility Criteria:

Surface mount technology required
Package footprint must be compatible with 8-PQFN or equivalent 8-pin power package configurations

Substitute parts are grouped into two categories: parametric equivalents (identical electrical specifications and package) and similar alternatives (equivalent electrical performance with different package geometry).

Parameter Comparison

Parameter	FDMS0309AS_SN00347	FDMS0309AS	DMT3004LPS-13	Unit
Manufacturer	onsemi	onsemi	Diodes Incorporated	—
Product Status	Obsolete	Active	Active	—
FET Type	N-Channel	N-Channel	N-Channel	—
Vdss	30	30	30	V
Id @ 25°C (Ta)	21	21	21	A
Id @ 25°C (Tc)	49	49	140	A
Rds On (Max) @ 10V	3.5	3.5	3.8	mOhm
Vgs(th) (Max)	3	3	3	V
Qg @ 10V	47	47	43.7	nC
Ciss @ 15V	3000	3000	2370	pF
Power Dissipation (Ta)	2.5	2.5	2.7	W
Power Dissipation (Tc)	50	50	113	W
Operating Temperature	-55 to 150	-55 to 150	-55 to 150	°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	—
Package	8-PQFN (5x6)	8-PQFN (5x6)	PowerDI5060-8	—
RoHS Status	Not Specified	ROHS3 Compliant	ROHS3 Compliant	—
MSL Rating	Not Applicable	1 (Unlimited)	1 (Unlimited)	—

Engineering Selection Recommendations

FDMS0309AS (onsemi) is the primary substitute for FDMS0309AS_SN00347. This part is electrically identical with matching Vdss, Id, Rds On, Vgs(th), gate charge, and input capacitance specifications. Both devices utilize the same 8-PQFN (5x6) package footprint, enabling direct board-level replacement without layout modifications. FDMS0309AS carries Active product status with ROHS3 compliance and MSL 1 rating, providing superior supply chain availability and regulatory support compared to the obsolete original part.

DMT3004LPS-13 (Diodes Incorporated) serves as an alternative substitute with equivalent electrical performance at the Ta rating. This device maintains the same 30V Vdss, 21A Ta drain current, and compatible gate threshold voltage. The Rds On specification of 3.8mOhm at 10V is marginally higher than the original 3.5mOhm but remains within acceptable operating parameters. Gate charge and input capacitance are lower, resulting in improved switching efficiency. The primary distinction is the PowerDI5060-8 package, which differs from the 8-PQFN footprint and requires PCB layout evaluation. DMT3004LPS-13 is Active with ROHS3 compliance and MSL 1 rating. The higher Tc current rating (140A versus 49A) provides enhanced thermal performance in high-power applications.

Both substitute parts are REACH Unaffected and carry EAR99 ECCN classification, matching the regulatory profile of the original component.

Frequently Asked Questions (FAQ)

Q: Can FDMS0309AS directly replace FDMS0309AS_SN00347 without PCB modifications?

A: Yes. FDMS0309AS is a parametric equivalent with identical electrical specifications and package geometry (8-PQFN 5x6). Direct board-level substitution is supported without layout changes.

Q: What is the primary difference between FDMS0309AS and DMT3004LPS-13?

A: Both devices meet the 30V, 21A Ta electrical requirements. The key difference is package format: FDMS0309AS uses 8-PQFN (5x6), while DMT3004LPS-13 uses PowerDI5060-8. PCB footprint compatibility must be verified before selection. DMT3004LPS-13 offers higher Tc current (140A) for improved thermal performance.

Q: Is the 3.8mOhm Rds On of DMT3004LPS-13 acceptable as a substitute for the 3.5mOhm specification?

A: The 0.3mOhm difference represents approximately 8.6% variance. Substitution is acceptable for applications where this on-state resistance increase does not exceed thermal or efficiency margins. Circuit-level thermal analysis is required for high-current applications.

Q: What is the impact of lower gate charge (43.7nC) in DMT3004LPS-13 compared to 47nC in the original?

A: Lower gate charge reduces switching losses and driver power consumption, resulting in improved efficiency. This is a beneficial characteristic for switching applications and does not compromise compatibility.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both FDMS0309AS and DMT3004LPS-13 carry ROHS3 compliance certification, meeting environmental and regulatory requirements for current manufacturing standards.

Q: What is the MSL rating significance for these components?

A: Both substitute parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions during storage and handling. This provides flexibility in supply chain management and reduces risk of moisture-induced failures.

Q: Can DMT3004LPS-13 be used in applications requiring the exact 8-PQFN package footprint?

A: No. DMT3004LPS-13 uses PowerDI5060-8 package, which has a different footprint than 8-PQFN (5x6). PCB redesign is required for this substitution. For direct footprint compatibility, FDMS0309AS is the appropriate choice.

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