FDMS0312S N-Channel 30V MOSFET Equivalent & Substitute Parts

Part Overview

The FDMS0312S is an N-Channel 30V MOSFET manufactured by onsemi, designed for surface mount applications in the 8-PQFN (5x6) package. This device operates as an active product with continuous drain current ratings of 19A at ambient temperature (Ta) and 42A at case temperature (Tc). The FDMS0312S belongs to the PowerTrench® and SyncFET™ series and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are necessary when the primary device becomes unavailable, when alternative packaging formats are required for manufacturing flexibility, or when design optimization calls for comparable performance characteristics from different manufacturers. Substitute devices must maintain electrical compatibility across critical parameters including drain-source voltage, continuous drain current, on-resistance, and gate charge specifications.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current @ 25°C (Ta)	19	A
Continuous Drain Current @ 25°C (Tc)	42	A
Rds On (Max) @ 18A, 10V	4.9	mOhm
Gate Charge (Qg) @ 10V	46	nC
Input Capacitance (Ciss) @ 15V	2820	pF
Vgs(th) @ 1mA	3	V
Operating Temperature Range	-55 to 150	°C (TJ)
Package Type	8-PowerTDFN (8-PQFN 5x6)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the FDMS0312S is determined by strict equivalence across the following critical electrical parameters:

Primary Substitution Criteria:

Drain-Source Voltage (Vdss): Must equal 30V
Continuous Drain Current (Ta): Must be ≥19A
Continuous Drain Current (Tc): Must be ≥42A
On-Resistance (Rds On): Must not exceed 4.9mOhm at specified test conditions
Gate Charge (Qg): Must not exceed 46nC at 10V
Input Capacitance (Ciss): Must not exceed 2820pF at 15V
Vgs(th): Must not exceed 3V at 1mA
Operating Temperature Range: Must support -55°C to 150°C (TJ)
Package Type: Must be 8-PowerTDFN compatible
Mounting Type: Must be Surface Mount
Compliance: Must be RoHS3 compliant

Substitute parts are grouped by manufacturer and package variant. All listed substitutes maintain the 30V Vdss rating and support the required continuous drain current specifications. Differences in gate charge, input capacitance, and on-resistance are noted where they vary from the main part, as these parameters affect switching performance and thermal characteristics.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ Ta (A)	Id @ Tc (A)	Rds On (mOhm)	Qg @ 10V (nC)	Ciss @ 15V (pF)	Package	Inventory
FDMS0312S	onsemi	30	19	42	4.9	46	2820	8-PQFN (5x6)	15386
BSC042N03LSGATMA1	Infineon	30	20	93	4.2	42	3500	PG-TDSON-8-5	3200
BSC042N03MSGATMA1	Infineon	30	17	93	4.2	55	4300	PG-TDSON-8-5	5967
BSC050N03LSGATMA1	Infineon	30	18	80	5.0	35	2800	PG-TDSON-8-5	1000400
BSC0906NSATMA1	Infineon	30	18	63	4.5	13	870	PG-TDSON-8-6	20300
BSZ050N03MSGATMA1	Infineon	30	15	40	4.5	46	3600	PG-TSDSON-8	5200
CSD17310Q5A	Texas Instruments	30	21	100	5.1	11.6	1560	8-VSONP (5x6)	30300
CSD17506Q5A	Texas Instruments	30	—	100	4.0	11	1650	8-VSONP (5x6)	25100
CSD17510Q5A	Texas Instruments	30	20	100	5.2	8.3	1250	8-VSONP (5x6)	17600
CSD17577Q5A	Texas Instruments	30	60	—	4.2	35	2310	8-VSONP (5x6)	24121
CSD17577Q5AT	Texas Instruments	30	60	—	4.2	35	2310	8-VSONP (5x6)	3764

Engineering Selection Recommendations

Infineon OptiMOS™ Series Substitutes:

The Infineon BSC042N03LSGATMA1 and BSC050N03LSGATMA1 devices provide direct functional equivalence to the FDMS0312S with improved continuous drain current ratings at case temperature (93A and 80A respectively). Both devices maintain 30V Vdss rating and support the required ambient temperature drain current specifications. The BSC050N03LSGATMA1 offers the highest inventory availability (1,000,400 units) and is RoHS3 compliant. The BSC042N03MSGATMA1 variant is available in Tape & Reel packaging and provides equivalent electrical performance with higher gate charge (55nC) and input capacitance (4300pF).

The BSC0906NSATMA1 operates within specification with 18A continuous drain current at ambient temperature and 63A at case temperature. This device features significantly lower gate charge (13nC) and input capacitance (870pF), which reduces switching losses in high-frequency applications. The BSZ050N03MSGATMA1 provides comparable performance with 15A ambient drain current and 40A case drain current, suitable for applications where lower continuous current is acceptable.

Texas Instruments NexFET™ Series Substitutes:

The CSD17310Q5A, CSD17510Q5A, and CSD17577Q5A devices from Texas Instruments maintain 30V Vdss and exceed the FDMS0312S continuous drain current requirements. The CSD17310Q5A provides 21A at ambient temperature and 100A at case temperature with significantly lower gate charge (11.6nC) and input capacitance (1560pF). The CSD17510Q5A offers 20A ambient and 100A case current with the lowest gate charge (8.3nC) among all substitutes, optimizing for switching speed and efficiency.

The CSD17577Q5A and CSD17577Q5AT are electrically identical devices differing only in packaging format (Tape & Reel versus Cut Tape & Digi-Reel®). Both provide 60A continuous drain current at ambient temperature with 4.2mOhm on-resistance and 35nC gate charge. The CSD17506Q5A is rated for 100A case drain current with the lowest on-resistance (4.0mOhm) among all substitutes.

All Texas Instruments substitutes are RoHS3 compliant. The CSD17510Q5A carries REACH Affected status, while CSD17577Q5AT carries REACH Affected status; all others are REACH Unaffected.

Packaging Considerations:

The FDMS0312S uses 8-PQFN (5x6) packaging. Infineon substitutes employ PG-TDSON-8-5, PG-TDSON-8-6, and PG-TSDSON-8 packages, which are mechanically and electrically compatible 8-PowerTDFN variants. Texas Instruments substitutes use 8-VSONP (5x6) packaging, also compatible with the 8-PowerTDFN footprint. PCB layout verification is required when transitioning between manufacturers due to potential variations in thermal pad design and lead frame geometry.

Frequently Asked Questions (FAQ)

Q: Can the BSC050N03LSGATMA1 directly replace the FDMS0312S without PCB modifications?

A: The BSC050N03LSGATMA1 is electrically compatible and uses the 8-PowerTDFN package family. However, thermal pad dimensions and lead frame geometry may differ between Infineon and onsemi implementations. PCB layout review is required to confirm thermal performance equivalence, particularly if the original design relies on specific thermal pad characteristics for heat dissipation.

Q: What is the primary advantage of the CSD17577Q5A over the FDMS0312S?

A: The CSD17577Q5A provides 60A continuous drain current at ambient temperature compared to 19A for the FDMS0312S, with lower gate charge (35nC versus 46nC) and reduced input capacitance (2310pF versus 2820pF). These characteristics reduce switching losses and enable higher frequency operation. The trade-off is slightly higher on-resistance (4.2mOhm versus 4.9mOhm) at the specified test condition.

Q: Are all listed substitutes RoHS3 compliant?

A: All listed substitute parts are RoHS3 compliant. REACH compliance status varies: most Infineon and Texas Instruments devices are REACH Unaffected. The CSD17510Q5A and CSD17577Q5AT are REACH Affected. Verify REACH compliance requirements for your specific application and region before final part selection.

Q: What is the difference between CSD17577Q5A and CSD17577Q5AT?

A: These devices are electrically and functionally identical. The primary difference is packaging format: CSD17577Q5A is supplied in Tape & Reel (TR) format with 24,121 units in stock, while CSD17577Q5AT is supplied in Cut Tape (CT) & Digi-Reel® format with 3,764 units in stock. Select based on your procurement and assembly process requirements.

Q: Can I use the BSC042N03MSGATMA1 if my design requires lower gate charge?

A: The BSC042N03MSGATMA1 has higher gate charge (55nC) compared to the FDMS0312S (46nC), making it less suitable for applications requiring minimal switching losses. The BSC0906NSATMA1 (13nC) or Texas Instruments CSD17510Q5A (8.3nC) are better choices for low gate charge requirements.

Q: What inventory considerations should guide my substitute part selection?

A: The BSC050N03LSGATMA1 offers exceptional availability with over 1 million units in stock, providing supply chain security. The CSD17310Q5A (30,300 units) and CSD17577Q5A (24,121 units) from Texas Instruments also provide strong inventory positions. For applications with immediate delivery requirements, these high-inventory options reduce lead time risk.

Q: How do I verify thermal performance equivalence when switching manufacturers?

A: Thermal performance depends on power dissipation (Pd = I²Rds On), junction-to-ambient thermal resistance (θJA), and PCB thermal design. Compare the maximum power dissipation ratings: FDMS0312S is rated 2.5W (Ta) and 46W (Tc). Verify that your substitute part's thermal resistance and power dissipation ratings support your application's thermal requirements. Consult thermal simulation or testing if operating near maximum ratings.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message