FDMS8690 N-Channel 30V MOSFET Equivalent & Substitute Parts

Part Overview

The FDMS8690 is an N-Channel 30V MOSFET manufactured by onsemi in the PowerTrench® series, rated for 14A continuous drain current (Ta) and 27A (Tc) in a surface mount 8-MLP (5x6) package. This device is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across drain-source voltage, continuous drain current, on-resistance characteristics, and thermal performance parameters while accommodating available packaging options.

Key Parameters

Parameter	FDMS8690 Specification	Unit
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current @ 25°C (Ta)	14	A
Continuous Drain Current @ 25°C (Tc)	27	A
Rds On (Max) @ Id, Vgs	9 mOhm @ 14A, 10V	mOhm
Gate Threshold Voltage (Vgs(th)) @ Id	3	V @ 250µA
Gate Charge (Qg) @ Vgs	27	nC @ 10V
Input Capacitance (Ciss) @ Vds	1680	pF @ 15V
Power Dissipation (Ta)	2.5	W
Power Dissipation (Tc)	37.8	W
Operating Temperature Range	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package	8-MLP (5x6), Power56	—
FET Type	N-Channel	—
Technology	MOSFET (Metal Oxide)	—

Substitute Part Grouping Explanation

Substitute parts for the FDMS8690 are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Drain to Source Voltage (Vdss): 30V minimum
Continuous Drain Current (Ta): 14A minimum at 25°C
On-Resistance (Rds On): 9 mOhm or lower at rated conditions
Gate Threshold Voltage (Vgs(th)): Compatible gate drive requirements
Operating Temperature Range: -55°C to 150°C minimum
Surface Mount Configuration: 8-pin package variants

Substitution Categories:

Category 1: Direct Electrical Equivalents — Parts meeting or exceeding all electrical specifications with compatible package footprints (8-pin surface mount variants including 8-MLP, 8-PQFN, 8-TDSON, 8-VSON).

Category 2: Enhanced Performance Alternatives — Parts with superior continuous drain current (Tc) ratings, lower on-resistance, or improved thermal characteristics while maintaining 30V Vdss and minimum 14A (Ta) current rating.

Category 3: Functional Alternatives — Parts with slightly reduced continuous drain current (Ta) but acceptable for applications with thermal management or reduced duty cycles, maintaining 30V Vdss and core electrical characteristics.

All substitute parts listed are N-Channel MOSFETs with surface mount packaging, operating temperature range of -55°C to 150°C, and gate voltage ratings compatible with standard 10V drive levels.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vdss (V)	Id @ Ta (A)	Id @ Tc (A)	Rds On (mOhm)	Vgs(th) (V)	Qg (nC)	Ciss (pF)	Package	Product Status
FDMS8690	onsemi	30	14	27	9	3	27	1680	8-MLP (5x6)	Obsolete
FDMS7694	Fairchild Semiconductor	30	13.2	20	9.5	3	22	1410	8-PQFN (5x6)	Active
BSC080N03LSGATMA1	Infineon Technologies	30	14	53	8	2.2	21	1700	PG-TDSON-8-5	Obsolete
BSC080N03MSGATMA1	Infineon Technologies	30	13	53	8	2	27	2100	PG-TDSON-8-5	Not For New Designs
BSC090N03LSGATMA1	Infineon Technologies	30	13	48	9	2.2	18	1500	PG-TDSON-8-5	Active
BSC100N03MSGATMA1	Infineon Technologies	30	12	44	10	2	23	1700	PG-TDSON-8-5	Not For New Designs
BSC120N03LSGATMA1	Infineon Technologies	30	12	39	12	2.2	15	1200	PG-TDSON-8-5	Active
BSC120N03MSGATMA1	Infineon Technologies	30	11	39	12	2	20	1500	PG-TDSON-8-5	Active
CSD16410Q5A	Texas Instruments	25	16	59	8.5	2.3	5	740	8-VSONP (5x6)	Active
CSD17302Q5A	Texas Instruments	30	16	87	7.9	1.7	7	950	8-VSONP (5x6)	Active
CSD17307Q5A	Texas Instruments	30	14	73	10.5	1.8	5.2	700	8-VSONP (5x6)	Active

Engineering Selection Recommendations

Primary Recommendation for New Designs:

CSD17302Q5A (Texas Instruments NexFET™ series) is the preferred substitute for the FDMS8690. This part meets or exceeds all electrical specifications: 30V Vdss, 16A continuous drain current (Ta), 87A (Tc), and 7.9 mOhm on-resistance. The device is in Active product status, ensuring long-term availability and support. The 8-VSONP (5x6) package provides mechanical compatibility with the original 8-pin surface mount footprint. RoHS3 compliance and MSL 1 rating align with modern manufacturing requirements. Note: CSD17302Q5A carries REACH Affected status; verify compliance requirements for your application.

Secondary Recommendation for Active Product Status:

BSC090N03LSGATMA1 (Infineon OptiMOS™ series) provides an alternative with Active product status. This part delivers 30V Vdss, 13A continuous drain current (Ta), 48A (Tc), and 9 mOhm on-resistance, matching the FDMS8690 electrical envelope. The PG-TDSON-8-5 package is mechanically compatible with 8-pin surface mount requirements. RoHS3 compliance and MSL 1 rating are confirmed. This option is suitable for applications where Infineon device qualification is preferred.

Alternative for Thermal Performance Priority:

BSC080N03LSGATMA1 (Infineon OptiMOS™ series) offers superior thermal characteristics with 53A continuous drain current (Tc) and 8 mOhm on-resistance, though it carries Obsolete product status. This part is suitable only for existing production lines with established supply agreements.

Not Recommended for New Designs:

FDMS7694 (Fairchild Semiconductor): Reduced continuous drain current (13.2A Ta, 20A Tc) and higher on-resistance (9.5 mOhm) compared to FDMS8690.
BSC100N03MSGATMA1, BSC100N03MSGATMA1, BSC120N03MSGATMA1: Not For New Designs or Obsolete status; continuous drain current (Ta) below 14A specification.
CSD16410Q5A: 25V Vdss rating is below the 30V requirement; suitable only for applications with reduced voltage headroom.

Compliance Considerations:

All recommended substitutes maintain -55°C to 150°C operating temperature range and surface mount configuration. Verify RoHS and REACH compliance requirements for your specific application and region. MSL 1 (Unlimited) moisture sensitivity applies to all listed parts, supporting standard PCB assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the FDMS8690 be directly replaced with CSD17302Q5A without circuit modifications?

A: CSD17302Q5A is electrically compatible with FDMS8690 across all critical parameters: 30V Vdss, 16A continuous drain current (Ta), and superior on-resistance (7.9 mOhm vs. 9 mOhm). Both devices use 8-pin surface mount packages with identical footprints. No circuit modifications are required. Verify gate drive voltage compatibility; CSD17302Q5A operates with 3V to 8V gate drive, while FDMS8690 uses 4.5V to 10V. Standard 10V gate drive signals are compatible with both devices.

Q: What is the difference between the Infineon BSC080N03LSGATMA1 and BSC080N03MSGATMA1?

A: Both parts share identical electrical specifications at the 30V Vdss and 14A (Ta) rating level. The primary differences are: BSC080N03LSGATMA1 carries Obsolete product status with Tape & Reel packaging, while BSC080N03MSGATMA1 is Not For New Designs with Cut Tape & Digi-Reel® packaging. Gate threshold voltage differs slightly (2.2V vs. 2V), and gate charge specifications vary (21 nC vs. 27 nC). For new designs, neither part is recommended due to product status; use CSD17302Q5A or BSC090N03LSGATMA1 instead.

Q: Why does CSD16410Q5A have a lower Vdss rating (25V) than the FDMS8690 (30V)?

A: CSD16410Q5A is rated for 25V maximum drain-source voltage, which is below the 30V specification of FDMS8690. This part is not suitable as a direct substitute for applications requiring 30V headroom. Use CSD16410Q5A only in circuits designed for 25V operation or lower. For 30V applications, select CSD17302Q5A or BSC090N03LSGATMA1.

Q: Are there package compatibility issues between the FDMS8690 8-MLP and substitute parts using 8-TDSON or 8-VSON packages?

A: The FDMS8690 uses 8-MLP (5x6) packaging, while substitutes use 8-PQFN, 8-TDSON, or 8-VSON variants. All these packages share identical 5x6 mm footprints and 8-pin configurations, providing mechanical compatibility on standard PCBs. Pin assignments and thermal pad locations are consistent across these package types. Verify PCB layout and thermal management design to ensure adequate heat dissipation for the substitute device's power rating.

Q: What is the significance of "Not For New Designs" product status?

A: Parts marked "Not For New Designs" are in mature or declining production phases. Manufacturers do not recommend these parts for new circuit designs due to potential future discontinuation or limited supply. These parts may be used in existing production lines with established supply agreements. For new designs, select parts with Active product status such as CSD17302Q5A, BSC090N03LSGATMA1, or BSC120N03LSGATMA1.

Q: How do gate charge (Qg) differences affect circuit performance?

A: Gate charge specifications (FDMS8690: 27 nC @ 10V; CSD17302Q5A: 7 nC @ 4.5V) reflect the energy required to switch the device. Lower gate charge enables faster switching and reduced driver power dissipation. CSD17302Q5A's lower gate charge improves switching efficiency but requires verification that existing gate driver circuits can supply the specified gate voltage levels. Standard 10V gate drivers are compatible with both devices.

Q: Is thermal performance a critical factor in selecting a substitute?

A: Yes. The FDMS8690 dissipates 37.8W (Tc) maximum. Substitute parts offer varying thermal performance: CSD17302Q5A provides superior thermal characteristics through lower on-resistance (7.9 mOhm) and higher continuous drain current (87A Tc). BSC090N03LSGATMA1 delivers 32W (Tc) dissipation with 9 mOhm on-resistance. Verify that PCB thermal design, heatsinking, and ambient operating conditions support the selected device's power dissipation requirements.

Q: What does MSL 1 (Unlimited) moisture sensitivity mean for manufacturing?

A: MSL 1 (Unlimited) indicates the device has no moisture sensitivity limitations. These parts do not require special moisture control during storage, handling, or PCB assembly. Standard manufacturing processes and storage conditions are acceptable. No baking or desiccant packaging is required prior to reflow soldering.

Q: Can FDMS8690 be used interchangeably with BSC120N03LSGATMA1?

A: No. BSC120N03LSGATMA1 has a continuous drain current (Ta) of 12A, which is below the FDMS8690's 14A specification. Additionally, on-resistance is higher (12 mOhm vs. 9 mOhm), resulting in increased power dissipation. This part is suitable only for applications with reduced current requirements or where higher on-resistance is acceptable. For equivalent performance, use CSD17302Q5A or BSC090N03LSGATMA1.

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