IRFR3708TRLPBF N-Channel 30V 61A MOSFET Equivalent & Substitute Parts

Part Overview

The IRFR3708TRLPBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 30V drain-to-source voltage and 61A continuous drain current in the HEXFET® series. This device is housed in a Surface Mount TO-252-3 DPAK package and is classified as Obsolete product status. Due to its obsolete classification, equivalent and substitute parts from active product lines or alternative manufacturers are necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility across critical electrical parameters including voltage rating, current capacity, on-resistance characteristics, and thermal performance while accommodating packaging and mounting type variations.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	30	V
Current - Continuous Drain (Id) @ 25°C	61	A (Tc)
Rds On (Max) @ Id, Vgs	12.5 mOhm @ 15A, 10V	mOhm
Gate Charge (Qg) (Max) @ Vgs	24	nC @ 4.5V
Power Dissipation (Max)	87	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-252-3 DPAK	Surface Mount
Vgs (Max)	±12	V
Input Capacitance (Ciss) (Max) @ Vds	2417	pF @ 15V

Substitute Part Grouping Explanation

Substitution eligibility for the IRFR3708TRLPBF is determined by the following critical parameters:

Primary Substitution Criteria:

Drain to Source Voltage (Vdss): Must equal 30V
FET Type: Must be N-Channel
Technology: Must be MOSFET (Metal Oxide)
Package/Case: Must be TO-252-3 DPAK or equivalent surface mount package
Operating Temperature Range: Must support -55°C to 175°C minimum

Secondary Compatibility Parameters:

Current - Continuous Drain (Id): Substitute must meet or exceed 61A at 25°C
Rds On (Max): Lower or equal on-resistance values are acceptable
Power Dissipation (Max): Must support 87W or greater thermal capacity
Gate Charge (Qg): Lower values preferred for switching efficiency
Vgs (Max): Must accommodate ±12V gate voltage or greater

Substitute parts are grouped into two categories: Direct Equivalents (matching or exceeding all primary specifications with active product status) and Functional Alternatives (meeting electrical requirements with acceptable trade-offs in current rating or thermal performance).

Parameter Comparison

Parameter	IRFR3708TRLPBF	IPD30N03S2L20ATMA1	BUK9214-30A,118	DMN3016LK3-13	FDD6690A	NTD4815N-35G
Manufacturer	Infineon	Infineon	Nexperia	Diodes Inc.	onsemi	onsemi
Vdss (V)	30	30	30	30	30	30
Id @ 25°C (A)	61 (Tc)	30 (Tc)	63 (Tc)	12.4 (Ta)	12 (Ta) / 46 (Tc)	6.9 (Ta) / 35 (Tc)
Rds On (Max) @ 10V (mOhm)	12.5 @ 15A	20 @ 18A	12 @ 25A	12 @ 11A	12 @ 12A	15 @ 30A
Power Dissipation (Max) (W)	87 (Tc)	60 (Tc)	107 (Tc)	1.6 (Ta)	3.3 (Ta) / 56 (Tc)	1.26 (Ta) / 32.6 (Tc)
Gate Charge (Qg) (nC)	24 @ 4.5V	19 @ 10V	31 @ 5V	25.1 @ 10V	18 @ 5V	14.1 @ 11.5V
Vgs (Max) (V)	±12	±20	±15	±20	±20	±20
Operating Temp Range (°C)	-55 to 175	-55 to 175	-55 to 175	-55 to 150	-55 to 175	-55 to 175
Package Type	TO-252-3 DPAK (SM)	PG-TO252-3-11 (SM)	DPAK (SM)	TO-252-3 (SM)	TO-252AA (SM)	TO-251-3 (TH)
Product Status	Obsolete	Active	Obsolete	Active	Obsolete	Obsolete
RoHS Compliance	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3
Moisture Sensitivity (MSL)	1	1	1	1	1	1

Engineering Selection Recommendations

Primary Recommendation: IPD30N03S2L20ATMA1

The IPD30N03S2L20ATMA1 from Infineon Technologies is the preferred substitute for new designs. This part maintains the same 30V voltage rating and shares the same manufacturer ecosystem as the original IRFR3708TRLPBF. The IPD30N03S2L20ATMA1 carries Active product status, ensuring long-term availability and supply chain stability. It is ROHS3 compliant with MSL 1 rating, matching the original part's environmental qualifications. The primary trade-off is reduced continuous drain current (30A versus 61A) and lower power dissipation (60W versus 87W). This substitute is suitable for applications where the full 61A current capacity is not required. The part is supplied in Tape & Reel packaging for automated assembly.

Secondary Recommendation: BUK9214-30A,118

The BUK9214-30A,118 from Nexperia USA Inc. provides the closest electrical match to the IRFR3708TRLPBF, with 63A continuous drain current and 107W power dissipation exceeding the original specifications. This TrenchMOS™ series device maintains 30V Vdss rating and TO-252-3 DPAK surface mount packaging. The part carries AEC-Q101 automotive qualification, providing additional reliability assurance. However, BUK9214-30A,118 is classified as Obsolete, limiting its suitability for new long-term production programs. This substitute is appropriate for legacy system maintenance and repair applications where existing design validation has been completed.

Tertiary Recommendation: FDD6690A

The FDD6690A from onsemi offers a functional alternative with dual current ratings (12A at Ta, 46A at Tc) and dual power dissipation values (3.3W at Ta, 56W at Tc). This PowerTrench® series device maintains 30V Vdss and TO-252AA surface mount packaging compatible with DPAK footprints. The FDD6690A is suitable for applications with moderate current requirements and provides lower gate charge (18 nC) for improved switching performance. Product status is Obsolete, restricting use to maintenance and repair scenarios.

Not Recommended for Direct Substitution:

DMN3016LK3-13 and NTD4815N-35G do not meet the continuous drain current requirement of 61A. DMN3016LK3-13 is limited to 12.4A (Ta) and NTD4815N-35G to 6.9A (Ta) / 35A (Tc). Additionally, NTD4815N-35G uses Through Hole I-Pak packaging, incompatible with surface mount applications. These parts are suitable only for lower-current applications or as reference designs for alternative topologies.

Frequently Asked Questions (FAQ)

Q: Can the IPD30N03S2L20ATMA1 replace the IRFR3708TRLPBF in all applications?

A: The IPD30N03S2L20ATMA1 is suitable for applications where continuous drain current does not exceed 30A. If your circuit requires the full 61A capacity of the IRFR3708TRLPBF, this substitute will not be adequate. Verify your actual operating current before selection.

Q: What is the difference between Ta and Tc current ratings?

A: Ta (ambient temperature) ratings assume measurement at 25°C ambient with natural convection cooling. Tc (case temperature) ratings assume measurement at 25°C case temperature with active thermal management. Tc ratings are typically higher and represent the device's true current capacity under proper thermal conditions.

Q: Are all substitute parts compatible with the original DPAK footprint?

A: All recommended substitutes use TO-252-3 DPAK or equivalent surface mount packages with identical pin configurations. PCB footprints are compatible. NTD4815N-35G is the exception, using Through Hole I-Pak packaging and requiring different PCB layout.

Q: Why is the IRFR3708TRLPBF classified as Obsolete?

A: Obsolete classification indicates the manufacturer has discontinued production. The part remains available through existing inventory channels but will not receive design updates or long-term supply guarantees. New designs should transition to Active product alternatives.

Q: What does RoHS3 compliance mean?

A: ROHS3 (Restriction of Hazardous Substances Directive 3) compliance certifies that the component contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, or polybrominated diphenyl ethers above specified thresholds. All listed substitutes meet this environmental standard.

Q: Can I use BUK9214-30A,118 as a direct replacement despite Obsolete status?

A: BUK9214-30A,118 provides superior electrical performance (63A, 107W) and is electrically compatible. However, Obsolete status means limited future availability. Use this substitute only for maintenance of existing products or short-term production runs where supply has been secured.

Q: What is Moisture Sensitivity Level (MSL) 1?

A: MSL 1 indicates Unlimited shelf life without moisture control requirements. The component can be stored at room temperature without desiccant packaging or special humidity controls. All listed parts carry MSL 1 rating.

Q: How do I determine if a substitute's on-resistance is acceptable?

A: Lower on-resistance (Rds On) values reduce power dissipation and heat generation. If your application operates at the specified current and voltage conditions, verify that the substitute's Rds On does not exceed your thermal budget. Most substitutes listed have equal or lower Rds On values than the original.

Q: Is gate charge (Qg) important for my application?

A: Gate charge affects switching speed and driver circuit requirements. Lower Qg values (FDD6690A at 18 nC) enable faster switching and reduce driver power consumption. Higher Qg values (BUK9214-30A,118 at 31 nC) require more robust gate drive circuits but may provide better noise immunity.

Q: Can I parallel multiple lower-current devices to replace the 61A rating?

A: Paralleling MOSFETs requires careful circuit design to ensure equal current distribution. This approach is not recommended without extensive thermal and electrical analysis. Select a substitute with adequate current rating instead.

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