FDD4243-F085 Equivalent & Substitute Parts

Part Overview

The FDD4243-F085 is a P-Channel 40V MOSFET manufactured by onsemi, housed in a TO-252AA (DPAK) surface mount package. This device is rated for 6.7A continuous drain current at 25°C (Ta) and 14A at case temperature (Tc), with a maximum power dissipation of 50W. The part is qualified to AEC-Q101 automotive standards and carries ROHS3 compliance.

The FDD4243-F085 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this MOSFET topology.

Key Parameters

Parameter	Value	Unit
FET Type	P-Channel	—
Drain to Source Voltage (Vdss)	40	V
Continuous Drain Current (Id) @ 25°C	6.7 (Ta), 14 (Tc)	A
Rds On (Max) @ Id, Vgs	44	mOhm @ 6.7A, 10V
Gate Threshold Voltage (Vgs(th)) @ Id	3	V @ 250µA
Power Dissipation (Max)	50 (Tc)	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package Type	TO-252-3 (DPAK)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Automotive Grade	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the FDD4243-F085 is determined by the following critical parameters:

Mandatory Matching Criteria:

FET Type: P-Channel
Drain to Source Voltage (Vdss): 40V minimum
Package Type: TO-252-3 (DPAK) surface mount
Mounting Type: Surface mount
RoHS Compliance: ROHS3 Compliant

Performance Compatibility Criteria:

Continuous Drain Current (Id): Equal to or greater than 6.7A (Ta) or 14A (Tc)
Rds On (Max): Equal to or less than 44 mOhm at specified conditions
Gate Threshold Voltage (Vgs(th)): Within ±0.5V of 3V @ 250µA
Power Dissipation: Equal to or greater than 50W (Tc)
Operating Temperature: Minimum -55°C to +150°C

Substitute parts are grouped into two categories:

Category A – Direct Equivalents (Automotive Grade, AEC-Q101): Parts meeting all mandatory criteria with automotive qualification matching the original specification.

Category B – Functional Equivalents (Active Status): Parts meeting all mandatory criteria with active product status, suitable for applications where automotive qualification is not required or where enhanced performance is acceptable.

Parameter Comparison

Parameter	FDD4243-F085 (onsemi)	PJD16P04-AU_L2_000A1 (Panjit)	AOD413A (Alpha & Omega)	NP15P04SLG-E1-AY (Renesas)	DMP4047SK3-13 (Diodes)	IXTY32P05T (IXYS)	TJ15P04M3,RQ(S (Toshiba)
Manufacturer	onsemi	Panjit International Inc.	Alpha & Omega Semiconductor Inc.	Renesas Electronics Corporation	Diodes Incorporated	IXYS	Toshiba Semiconductor and Storage
FET Type	P-Channel	P-Channel	P-Channel	P-Channel	P-Channel	P-Channel	P-Channel
Vdss (V)	40	40	40	40	40	50	40
Id @ 25°C (A)	6.7 (Ta), 14 (Tc)	5 (Ta), 16 (Tc)	12 (Tc)	15 (Ta)	20 (Tc)	32 (Tc)	15 (Ta)
Rds On (Max) (mOhm)	44 @ 6.7A, 10V	45 @ 10A, 10V	44 @ 12A, 10V	40 @ 7.5A, 10V	45 @ 4.4A, 10V	39 @ 16A, 10V	36 @ 7.5A, 10V
Vgs(th) (V) @ Id	3 @ 250µA	2.5 @ 250µA	3 @ 250µA	2.5 @ 250µA	3 @ 250µA	4.5 @ 250µA	2 @ 100µA
Gate Charge (Qg) (nC) @ 10V	29	8.3 @ 4.5V	21	23	23.2	46	26
Power Dissipation (Max) (W)	50 (Tc)	2 (Ta), 22 (Tc)	2.5 (Ta), 50 (Tc)	1.2 (Ta), 30 (Tc)	1.6 (Ta)	83 (Tc)	29 (Tc)
Operating Temperature (°C)	-55 to 150	-55 to 150	-55 to 175	to 175	-55 to 150	-55 to 150	to 150
Package Type	TO-252-3 (DPAK)	TO-252-3 (DPAK)	TO-252-3 (DPAK)	TO-252-3 (DPAK)	TO-252-3 (DPAK)	TO-252-3 (DPAK)	TO-252-3 (DPAK)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	AEC-Q101	AEC-Q101	—	—	—	—	—

Engineering Selection Recommendations

For Automotive Applications (AEC-Q101 Required):

The PJD16P04-AU_L2_000A1 (Panjit International Inc.) is the primary equivalent for the FDD4243-F085. Both parts carry AEC-Q101 automotive qualification and ROHS3 compliance. The PJD16P04-AU_L2_000A1 provides 16A continuous drain current at case temperature, exceeding the original 14A specification, while maintaining compatible Rds On characteristics (45 mOhm vs. 44 mOhm). Operating temperature range matches at -55°C to 150°C. This part is currently in active production status with 3,427 units in stock.

For General-Purpose Applications (Non-Automotive):

Multiple active alternatives are available:

AOD413A (Alpha & Omega Semiconductor Inc.): Provides 12A continuous drain current with 44 mOhm Rds On, matching the original electrical characteristics. Extended operating temperature to 175°C. 146,230 units in stock.
NP15P04SLG-E1-AY (Renesas Electronics Corporation): Delivers 15A continuous drain current with improved 40 mOhm Rds On. Extended operating temperature to 175°C. 1,670 units in stock.
DMP4047SK3-13 (Diodes Incorporated): Offers 20A continuous drain current with 45 mOhm Rds On. Maintains -55°C to 150°C operating range. 30,600 units in stock.
TJ15P04M3,RQ(S (Toshiba Semiconductor and Storage): Provides 15A continuous drain current with superior 36 mOhm Rds On. U-MOSVI series technology. 3,475 units in stock.

For High-Current Applications:

The IXTY32P05T (IXYS) is suitable where higher current capacity is required. This part delivers 32A continuous drain current with 39 mOhm Rds On and 83W power dissipation. Vdss is rated at 50V, providing additional voltage margin. TrenchP™ series technology. 21,200 units in stock. Note: Vgs(th) is 4.5V @ 250µA, requiring gate drive circuit verification.

All substitute parts maintain TO-252-3 (DPAK) surface mount packaging, ensuring mechanical and thermal compatibility with the original design.

Frequently Asked Questions (FAQ)

Q: Can the PJD16P04-AU_L2_000A1 directly replace the FDD4243-F085 in automotive applications?

A: Yes. Both parts are AEC-Q101 qualified, ROHS3 compliant, and housed in TO-252-3 (DPAK) packages. The PJD16P04-AU_L2_000A1 provides 16A continuous drain current at case temperature, exceeding the original 14A specification. Rds On characteristics are compatible (45 mOhm vs. 44 mOhm). Operating temperature range matches at -55°C to 150°C. Electrical performance is equivalent for standard switching applications.

Q: What is the difference between Ta (ambient temperature) and Tc (case temperature) current ratings?

A: Ta (ambient temperature) current rating assumes operation in free air at 25°C without forced cooling. Tc (case temperature) rating assumes the device case is maintained at 25°C through active cooling or thermal management. Tc ratings are typically higher because they represent the device's capability under controlled thermal conditions. Design calculations should use the appropriate rating based on the thermal management strategy employed in the application.

Q: Are all substitute parts pin-compatible with the FDD4243-F085?

A: Yes. All listed substitute parts use the TO-252-3 (DPAK) package with identical pin configuration: Gate, Drain, and Source connections. Physical footprint and PCB layout compatibility is maintained across all substitutes.

Q: Can I use the IXTY32P05T in place of the FDD4243-F085?

A: The IXTY32P05T is functionally compatible from a package and electrical standpoint. However, three differences require verification: (1) Vdss is 50V instead of 40V, providing additional voltage margin; (2) Vgs(th) is 4.5V @ 250µA instead of 3V, requiring confirmation that gate drive voltage is sufficient; (3) Gate charge is 46 nC @ 10V versus 29 nC, affecting switching speed and drive circuit power consumption. The part is not AEC-Q101 qualified. Use is appropriate for non-automotive applications where higher current capacity is beneficial.

Q: What is the significance of RoHS3 compliance?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, hexavalent chromium, and certain brominated flame retardants. All listed substitute parts carry ROHS3 compliance, ensuring regulatory alignment with the original FDD4243-F085 and compatibility with modern supply chain requirements.

Q: How do I determine which substitute is best for my application?

A: Selection depends on three factors: (1) Regulatory requirements—if AEC-Q101 automotive qualification is mandatory, use PJD16P04-AU_L2_000A1; (2) Current requirements—if continuous drain current exceeds 14A, consider AOD413A (12A), NP15P04SLG-E1-AY (15A), DMP4047SK3-13 (20A), TJ15P04M3,RQ(S (15A), or IXTY32P05T (32A); (3) Thermal management—if power dissipation or operating temperature range is critical, verify the substitute's specifications against your design limits.

Q: What is the MSL (Moisture Sensitivity Level) rating?

A: All listed parts carry MSL 1 (Unlimited), indicating no moisture sensitivity. These devices do not require special moisture control during storage, handling, or assembly. Standard PCB assembly processes are applicable without additional precautions.

Q: Are there any gate drive considerations when substituting parts?

A: Most substitutes maintain Vgs(th) near 3V @ 250µA, compatible with standard gate drive circuits. The exception is IXTY32P05T, which specifies 4.5V @ 250µA. Verify that your gate drive voltage is sufficient to achieve full on-state performance. Additionally, gate charge (Qg) varies across substitutes (8.3 nC to 46 nC), affecting switching speed and drive circuit power consumption. Review datasheet switching characteristics for your specific application.

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