FDMS8692 N-Channel 30V MOSFET Equivalent & Substitute Parts

Part Overview

The FDMS8692 is an N-Channel 30V MOSFET manufactured by onsemi in the PowerTrench® series, rated for 12A continuous drain current (Ta) and 28A (Tc) in an 8-PQFN (5x6) surface mount package. This device is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing production support, design updates, and inventory management. The part operates across a temperature range of -55°C to 150°C (TJ) and is suitable for general-purpose switching applications requiring moderate current handling in compact form factors.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current @ 25°C (Ta)	12	A
Continuous Drain Current @ 25°C (Tc)	28	A
Rds On (Max) @ Id, Vgs	9 mOhm @ 12A, 10V	mOhm
Gate Charge (Qg) @ Vgs	21 nC @ 10V	nC
Input Capacitance (Ciss) @ Vds	1265 pF @ 15V	pF
Power Dissipation (Ta)	2.5	W
Power Dissipation (Tc)	41	W
Operating Temperature Range	-55 to 150	°C
Package Type	8-PQFN (5x6)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the FDMS8692 is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

Drain to Source Voltage (Vdss): Must equal or exceed 30V
Continuous Drain Current (Ta): Must equal or exceed 12A
Continuous Drain Current (Tc): Must equal or exceed 28A
Rds On (Max): Must not exceed 9 mOhm at rated conditions
Gate Charge (Qg): Must not exceed 21 nC at 10V
Input Capacitance (Ciss): Must not exceed 1265 pF at 15V
Operating Temperature Range: Must encompass -55°C to 150°C
Package Type: Must be compatible 8-pin surface mount configuration
FET Type: N-Channel only
Technology: MOSFET (Metal Oxide)

Secondary Considerations:

Product Status: Active or Not For New Designs preferred over Obsolete
Compliance: RoHS3 and REACH status alignment
Moisture Sensitivity Level (MSL): Level 1 (Unlimited) preferred

Substitute parts are grouped into two categories: direct equivalents (matching all primary criteria within tolerance) and functional alternatives (meeting or exceeding performance specifications with minor parameter variations).

Parameter Comparison

Parameter	FDMS8692	FDMS7694	BSC120N03LSGATMA1	BSC080N03LSGATMA1	BSC080N03MSGATMA1	BSC090N03LSGATMA1	BSC100N03MSGATMA1	BSC120N03MSGATMA1	CSD17302Q5A
Manufacturer	onsemi	Fairchild Semiconductor	Infineon	Infineon	Infineon	Infineon	Infineon	Infineon	Texas Instruments
Vdss (V)	30	30	30	30	30	30	30	30	30
Id @ 25°C Ta (A)	12	13.2	12	14	13	13	12	11	16
Id @ 25°C Tc (A)	28	20	39	53	53	48	44	39	87
Rds On (Max) (mOhm)	9	9.5	12	8	8	9	10	12	7.9
Qg @ 10V (nC)	21	22	15	21	27	18	23	20	7
Ciss @ 15V (pF)	1265	1410	1200	1700	2100	1500	1700	1500	950
Power Dissipation Ta (W)	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	3
Power Dissipation Tc (W)	41	27	28	35	35	32	30	28	—
Operating Temp Range (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package	8-PQFN (5x6)	8-PQFN (5x6)	PG-TDSON-8-5	PG-TDSON-8-5	PG-TDSON-8-5	PG-TDSON-8-5	PG-TDSON-8-5	PG-TDSON-8-5	8-VSONP (5x6)
Product Status	Obsolete	Active	Active	Obsolete	Not For New Designs	Active	Not For New Designs	Active	Active
RoHS Status	—	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Preferred for Replacement):

FDMS7694 (Fairchild Semiconductor) is the closest functional equivalent to the FDMS8692. Both devices share identical Vdss (30V), matching Ta drain current (12A vs. 13.2A), and nearly identical Rds On specifications (9 mOhm vs. 9.5 mOhm). The FDMS7694 is currently in Active product status, providing long-term availability and supply chain stability. Package compatibility is confirmed (8-PQFN 5x6). This part is suitable for direct substitution in existing designs.

Active Status Alternatives (Recommended for New Designs):

BSC090N03LSGATMA1 (Infineon OptiMOS™) meets all primary substitution criteria with 30V Vdss, 13A Ta current (exceeding 12A requirement), and 48A Tc current (exceeding 28A requirement). Rds On is 9 mOhm at 30A, 10V, matching the FDMS8692 specification. Gate charge is 18 nC, within the 21 nC limit. This device is Active status and RoHS3 compliant. Package is PG-TDSON-8-5, which is mechanically compatible with 8-pin surface mount layouts.

BSC120N03LSGATMA1 (Infineon OptiMOS™) provides 30V Vdss with 12A Ta current and 39A Tc current. Rds On is 12 mOhm at 30A, 10V, which exceeds the FDMS8692 specification by 3 mOhm. Gate charge is 15 nC, below the 21 nC limit. This device is Active status and RoHS3 compliant. Suitable for applications where slightly higher on-resistance is acceptable.

CSD17302Q5A (Texas Instruments NexFET™) exceeds all primary electrical specifications with 30V Vdss, 16A Ta current, and 87A Tc current. Rds On is 7.9 mOhm at 14A, 8V, providing superior performance. Gate charge is 7 nC at 4.5V, significantly lower than the FDMS8692. This device is Active status and RoHS3 compliant. Package is 8-VSONP (5x6), mechanically compatible with the original part. This part is suitable for performance-critical applications.

Obsolete Status Alternatives (Legacy Support Only):

BSC080N03LSGATMA1 and BSC080N03MSGATMA1 (Infineon OptiMOS™) meet electrical requirements but carry Obsolete or Not For New Designs status. These parts should be used only for legacy system maintenance where supply is available.

Compliance Considerations:

All recommended active-status alternatives are RoHS3 compliant and REACH unaffected, ensuring regulatory alignment with current environmental standards. The FDMS8692 carries no explicit RoHS designation; substitutes provide compliance assurance for new production runs.

Frequently Asked Questions (FAQ)

Q: Can the FDMS7694 be used as a direct replacement for the FDMS8692?

A: Yes. The FDMS7694 shares identical voltage rating (30V), nearly identical continuous drain current (13.2A vs. 12A), and matching Rds On specification (9.5 mOhm vs. 9 mOhm). Both use 8-PQFN (5x6) packages. The FDMS7694 is currently in Active production status, providing supply continuity. No circuit modifications are required.

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

A: Both are 8-pin surface mount packages with 5x6 mm footprints and are mechanically compatible for PCB layout purposes. The 8-PQFN is onsemi's designation; PG-TDSON-8-5 is Infineon's designation for the same physical form factor. Pin assignments and thermal characteristics are equivalent. PCB designs using either package type can accommodate the other without layout modification.

Q: Why does the CSD17302Q5A have lower gate charge (7 nC) compared to the FDMS8692 (21 nC)?

A: Gate charge variation reflects differences in internal transistor structure and manufacturing process between manufacturers. Lower gate charge in the CSD17302Q5A indicates faster switching characteristics, which can reduce switching losses in high-frequency applications. This is a performance advantage, not a compatibility issue. The CSD17302Q5A remains a valid substitute.

Q: Is the BSC120N03LSGATMA1 suitable if my application requires exactly 9 mOhm Rds On?

A: No. The BSC120N03LSGATMA1 specifies 12 mOhm Rds On at 30A, 10V, which exceeds the FDMS8692 specification by 3 mOhm. For applications requiring the exact 9 mOhm specification, use the FDMS7694, BSC090N03LSGATMA1, or CSD17302Q5A.

Q: Can I use a substitute part with higher continuous drain current (Tc) than the FDMS8692?

A: Yes. Higher Tc rating indicates greater thermal capacity and is not a compatibility concern. Parts such as the CSD17302Q5A (87A Tc) and BSC080N03LSGATMA1 (53A Tc) exceed the FDMS8692 (28A Tc) and provide additional thermal margin. This is beneficial for thermal management and reliability.

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

A: Parts marked "Not For New Designs" are in mature or declining production phases. While electrically functional and available in current inventory, manufacturers do not recommend their use in new product development. These parts are suitable for legacy system support and maintenance. For new designs, select parts with Active status such as FDMS7694, BSC090N03LSGATMA1, or CSD17302Q5A.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended active-status substitutes (FDMS7694, BSC090N03LSGATMA1, BSC120N03LSGATMA1, CSD17302Q5A) are explicitly RoHS3 compliant. The original FDMS8692 carries no RoHS designation. Substitution ensures compliance with current environmental regulations for new production runs.

Q: What is the operating temperature range compatibility?

A: All substitute parts listed operate across -55°C to 150°C (TJ), matching the FDMS8692 specification. No thermal performance adjustment is required when substituting.

Q: Can I substitute the FDMS8692 with a part rated for 34V (such as BSC0909NSATMA1)?

A: Yes, with design consideration. The BSC0909NSATMA1 is rated for 34V Vdss, exceeding the FDMS8692 (30V). Higher voltage rating provides additional safety margin and is not a compatibility issue. However, this part is not listed as a primary substitute due to the voltage rating difference. Use only if your application can accommodate the higher voltage specification.

Q: What inventory status should I consider when selecting a substitute?

A: Current inventory levels are provided for reference. FDMS7694 has 15,793 units available; BSC090N03LSGATMA1 has 23,536 units; CSD17302Q5A has 14,560 units. For long-term production support, prioritize parts with Active status and established supply chains rather than inventory quantity alone.

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