FDD3680 N-Channel MOSFET 100V 25A Equivalent & Substitute Parts

Part Overview

The FDD3680 is an N-Channel MOSFET manufactured by onsemi, rated for 100V drain-to-source voltage with 25A continuous drain current in a surface mount TO-252AA package. This device is part of the PowerTrench® series and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary to maintain design continuity and ensure long-term component availability for new designs and production runs.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	100	V
Continuous Drain Current (Id) @ 25°C	25	A
On-State Resistance (Rds On) @ 10V	46	mOhm
Gate-Source Threshold Voltage (Vgs(th))	4	V @ 250µA
Gate Charge (Qg) @ 10V	53	nC
Maximum Gate-Source Voltage (Vgs)	±20	V
Input Capacitance (Ciss) @ 50V	1735	pF
Power Dissipation (Max)	68	W
Operating Temperature Range	-55 to 175	°C
Package Type	TO-252-3 (DPAK)	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the FDD3680 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Drain-to-Source Voltage (Vdss): Must equal or exceed 100V
Continuous Drain Current (Id): Must equal or exceed 25A at rated temperature
Gate-Source Threshold Voltage (Vgs(th)): Must be compatible with 4V nominal specification
Maximum Gate-Source Voltage (Vgs): Must support ±20V operation
On-State Resistance (Rds On): Lower values indicate improved performance; values within 35–46 mOhm at 10V are acceptable

Mechanical & Environmental Compatibility:

Package Type: TO-252-3 (DPAK) surface mount configuration
Operating Temperature Range: Must support -55°C to 175°C
RoHS Compliance: ROHS3 Compliant
Moisture Sensitivity Level: MSL 1 (Unlimited)

Substitute parts are grouped into two categories:

Category A – Direct Electrical Equivalents (25A @ 100V): STD25NF10LT4, STD25NF10LA, STD25NF10T4, and STD25N10F7 from STMicroelectronics provide matched electrical performance with identical voltage and current ratings. These parts maintain the same gate threshold voltage range and are suitable for direct replacement in existing designs.

Category B – Higher Current Capability (>25A @ 100V): BUK7240-100A,118 from Nexperia USA Inc. and STD20NF10T4 from STMicroelectronics offer enhanced current handling (34A and 25A respectively) while maintaining 100V voltage rating. These parts provide design margin for applications requiring higher current capacity.

Category C – Lower Current Capability (<25A @ 100V): STD15NF10T4 from STMicroelectronics and RSD201N10TL from Rohm Semiconductor provide 23A and 20A continuous drain current respectively. These parts are suitable for applications where the full 25A rating is not required.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On @ 10V (mOhm)	Vgs(th) (V)	Qg @ 10V (nC)	Vgs Max (V)	Ciss @ 25-50V (pF)	Power Diss (W)	Temp Range (°C)	Status
FDD3680	onsemi	100	25	46	4	53	±20	1735	68	-55 to 175	Obsolete
STD25NF10LT4	STMicroelectronics	100	25	35	2.5	52	±16	1710	100	-55 to 175	Active
STD25NF10LA	STMicroelectronics	100	25	35	2.5	52	±16	1710	100	-55 to 175	Active
STD25NF10T4	STMicroelectronics	100	25	38	4	55	±20	1550	100	-55 to 175	Active
STD25N10F7	STMicroelectronics	100	25	35	4.5	14	±20	920	40	-55 to 175	Active
BUK7240-100A,118	Nexperia USA Inc.	100	34	40	4	N/A	±20	2293	114	-55 to 175	Obsolete
STD20NF10T4	STMicroelectronics	100	25	45	4	55	±20	1200	85	-55 to 175	Active
STD15NF10T4	STMicroelectronics	100	23	65	4	40	±20	870	70	-55 to 175	Active
RSD201N10TL	Rohm Semiconductor	100	20	46	2.5	55	±20	2100	20	-55 to 150	Active
STD26NF10	STMicroelectronics	100	25	38	4	55	±20	1550	100	-55 to 175	Active

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement):

STD25NF10T4 and STD26NF10 from STMicroelectronics are the preferred direct substitutes for the FDD3680. Both devices maintain 100V/25A electrical specifications with active product status, ROHS3 compliance, and full -55°C to 175°C operating temperature range. STD25NF10T4 offers slightly lower on-state resistance (38 mOhm vs. 46 mOhm) and improved power dissipation characteristics (100W vs. 68W), providing enhanced thermal performance. Both parts are available in high inventory quantities and support identical TO-252-3 (DPAK) surface mount packaging.

Secondary Substitutes (Enhanced Performance):

STD25NF10LT4 and STD25NF10LA from STMicroelectronics provide superior on-state resistance (35 mOhm) and power dissipation (100W), with lower gate threshold voltage (2.5V). These parts are suitable for applications requiring improved efficiency and thermal margin. Both maintain full compliance with RoHS3 and operating temperature specifications.

Alternative Substitutes (Current Derating):

STD15NF10T4 from STMicroelectronics is suitable for applications where continuous drain current requirements do not exceed 23A. This device maintains 100V voltage rating and full temperature range support, with active product status and ROHS3 compliance.

RSD201N10TL from Rohm Semiconductor provides 20A continuous drain current with matched on-state resistance (46 mOhm). This part is active and ROHS3 compliant but operates to 150°C maximum junction temperature, which is 25°C lower than the FDD3680 specification.

Avoid:

BUK7240-100A,118 from Nexperia USA Inc., despite higher current capability (34A), carries obsolete product status identical to the FDD3680 and does not resolve long-term availability concerns.

Frequently Asked Questions (FAQ)

Q: Can STD25NF10T4 directly replace FDD3680 in existing PCB layouts?

A: Yes. Both devices use identical TO-252-3 (DPAK) surface mount packaging with the same pin configuration and footprint. No PCB modifications are required.

Q: What is the difference between STD25NF10LT4 and STD25NF10T4?

A: STD25NF10LT4 features lower gate threshold voltage (2.5V vs. 4V) and lower on-state resistance (35 mOhm vs. 38 mOhm). STD25NF10T4 maintains the original 4V threshold voltage specification. Both support identical voltage and current ratings. Selection depends on gate drive circuit compatibility and efficiency requirements.

Q: Is RSD201N10TL suitable for applications requiring full 25A continuous current?

A: No. RSD201N10TL is rated for 20A continuous drain current, which is 5A below the FDD3680 specification. This part is suitable only for applications where maximum continuous current does not exceed 20A.

Q: Do all substitute parts maintain the -55°C to 175°C operating temperature range?

A: All recommended substitutes except RSD201N10TL support the full -55°C to 175°C range. RSD201N10TL operates to 150°C maximum junction temperature. Verify application temperature requirements before selection.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the FDD3680 environmental specifications.

Q: What is the advantage of STD25N10F7 over other STD25 variants?

A: STD25N10F7 features significantly lower gate charge (14 nC vs. 52–55 nC) and lower input capacitance (920 pF vs. 1200–1710 pF), resulting in faster switching performance and reduced gate drive power requirements. Power dissipation is lower (40W vs. 68–100W). This part is suitable for high-frequency switching applications.

Q: Can BUK7240-100A,118 be used as a substitute despite obsolete status?

A: BUK7240-100A,118 offers higher current capability (34A) but carries obsolete product status, which does not resolve the availability concerns that necessitate finding alternatives to the FDD3680. Active product alternatives are recommended for new designs.

Q: What packaging options are available for substitute parts?

A: All substitute parts are supplied in TO-252-3 (DPAK) surface mount configuration. Packaging options include Cut Tape (CT), Digi-Reel®, and Tape & Reel (TR) formats depending on the specific part number and supplier.

Q: How do I verify compatibility of a substitute part in my application?

A: Confirm that the substitute part meets or exceeds the following minimum requirements: 100V Vdss rating, 25A (or application-specific) continuous drain current, compatible gate threshold voltage for your gate drive circuit, and full -55°C to 175°C operating temperature range if required by your application.

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