IRFR3708PBF Equivalent & Substitute Parts

Part Overview

The IRFR3708PBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 30V drain-to-source voltage with 61A continuous drain current at 25°C. This device is housed in a TO-252-3 DPAK surface mount package and is designed for high-current switching applications requiring low on-resistance performance. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain compatibility with existing circuit designs while meeting the same electrical and mechanical specifications.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	61	A (Tc)
On-Resistance (Rds On Max) @ 15A, 10V	12.5	mOhm
Gate Threshold Voltage (Vgs th) @ 250µA	2	V
Gate Charge (Qg) @ 4.5V	24	nC
Power Dissipation (Max)	87	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-252-3 DPAK	Surface Mount
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the IRFR3708PBF is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal 30V
Package Type: Must be TO-252-3 DPAK surface mount
FET Type: Must be N-Channel MOSFET
Operating Temperature Range: Must support -55°C to 175°C minimum
RoHS Compliance: Must maintain ROHS3 Compliant status

Secondary Compatibility Parameters:

Continuous Drain Current (Id): Minimum 61A at 25°C (Tc rating)
On-Resistance (Rds On): Maximum 12.5mOhm @ specified conditions
Gate Threshold Voltage (Vgs th): Maximum 2V @ 250µA
Power Dissipation: Minimum 87W (Tc)

The substitute parts listed below meet the primary criteria. Secondary parameters are provided for engineering evaluation of circuit-specific requirements.

Parameter Comparison

Parameter	IRFR3708PBF	IPD30N03S2L20ATMA1	BUK9214-30A,118	DMN3016LK3-13	FDD6690A
Manufacturer	Infineon	Infineon	Nexperia	Diodes Inc.	onsemi
Vdss (V)	30	30	30	30	30
Id @ 25°C (A)	61 (Tc)	30 (Tc)	63 (Tc)	12.4 (Ta)	12 (Ta) / 46 (Tc)
Rds On Max (mOhm)	12.5 @ 15A, 10V	20 @ 18A, 10V	12 @ 25A, 10V	12 @ 11A, 10V	12 @ 12A, 10V
Vgs th Max (V)	2 @ 250µA	2 @ 23µA	2 @ 1mA	2.3 @ 250µA	3 @ 250µA
Qg Max (nC)	24 @ 4.5V	19 @ 10V	31 @ 5V	25.1 @ 10V	18 @ 5V
Power Dissipation Max (W)	87 (Tc)	60 (Tc)	107 (Tc)	1.6 (Ta)	3.3 (Ta) / 56 (Tc)
Operating Temp (°C)	-55 to 175	-55 to 175	-55 to 175	-55 to 150	-55 to 175
Package	TO-252-3 DPAK	PG-TO252-3-11	DPAK	TO-252-3	TO-252AA
Product Status	Discontinued	Active	Obsolete	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

BUK9214-30A,118 (Nexperia USA Inc.)

This part provides the closest electrical match to the IRFR3708PBF with 63A continuous drain current and 107W power dissipation, both exceeding the original specification. The on-resistance of 12mOhm @ 25A, 10V meets the performance requirement. However, this part carries an Obsolete product status designation. The device is AEC-Q101 qualified for automotive applications and maintains ROHS3 compliance. Current inventory availability is 18,285 pieces.

IPD30N03S2L20ATMA1 (Infineon Technologies)

This OptiMOS™ series device from the same manufacturer as the original part provides active product status with 5,988 pieces in stock. The 30A continuous drain current falls below the IRFR3708PBF specification, and power dissipation is rated at 60W (Tc). The on-resistance of 20mOhm @ 18A, 10V is higher than the original part. This substitute is suitable for applications where the 61A current rating is not a hard requirement. Operating temperature range matches the original at -55°C to 175°C.

DMN3016LK3-13 (Diodes Incorporated)

This part is rated for only 12.4A continuous drain current and 1.6W power dissipation (Ta), making it unsuitable for high-current applications matching the IRFR3708PBF specification. The device maintains active product status with 30,700 pieces available. Operating temperature range is limited to -55°C to 150°C, below the original specification. This part is appropriate only for low-current switching applications.

FDD6690A (onsemi)

This PowerTrench® device offers dual current ratings: 12A (Ta) and 46A (Tc), with corresponding power dissipation of 3.3W (Ta) and 56W (Tc). The 46A (Tc) rating approaches but does not meet the 61A specification. The part is designated Obsolete with 38,065 pieces in inventory. On-resistance of 12mOhm @ 12A, 10V meets the specification. Operating temperature range extends to 175°C, matching the original.

Recommendation Priority:

For applications requiring the full 61A current specification and active product status, BUK9214-30A,118 is the primary selection despite its Obsolete designation, as it is the only substitute meeting or exceeding all electrical parameters. For new designs or applications with reduced current requirements, IPD30N03S2L20ATMA1 offers active product status and manufacturer continuity with Infineon Technologies.

Frequently Asked Questions (FAQ)

Q: Can IPD30N03S2L20ATMA1 replace IRFR3708PBF in all applications?

A: No. The IPD30N03S2L20ATMA1 is rated for 30A continuous drain current versus the IRFR3708PBF's 61A rating. Substitution is valid only for applications where the actual circuit current requirement does not exceed 30A at 25°C. Power dissipation is also reduced from 87W to 60W (Tc).

Q: Why is BUK9214-30A,118 listed as Obsolete if it is recommended?

A: Product status reflects manufacturer discontinuation status, not component reliability or availability. BUK9214-30A,118 is Obsolete at the manufacturer level but remains in active distribution with 18,285 pieces currently in stock. Obsolete status indicates no new production; however, existing inventory remains available for procurement.

Q: Are all substitute parts in the same TO-252 DPAK package?

A: Yes. All listed substitutes use TO-252-3 DPAK or equivalent surface mount packages (TO-252AA, PG-TO252-3-11). These packages are mechanically and electrically compatible for PCB layout purposes. Pin configuration remains consistent across all parts.

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

A: Ta (ambient temperature) ratings specify continuous drain current at 25°C ambient temperature with natural convection cooling. Tc (case temperature) ratings specify continuous drain current at 25°C case temperature with active thermal management. Tc ratings are typically higher and represent performance under controlled thermal conditions.

Q: Do all substitutes maintain RoHS3 compliance?

A: Yes. All listed substitute parts are ROHS3 Compliant, matching the original IRFR3708PBF specification. REACH status is Unaffected for all parts.

Q: Which substitute has the lowest on-resistance?

A: BUK9214-30A,118 offers 12mOhm on-resistance @ 25A, 10V, matching the IRFR3708PBF's 12.5mOhm @ 15A, 10V specification. FDD6690A and DMN3016LK3-13 also specify 12mOhm but at different current conditions.

Q: Can DMN3016LK3-13 be used as a direct replacement?

A: No. DMN3016LK3-13 is rated for only 12.4A continuous drain current and 1.6W power dissipation, making it unsuitable for applications requiring the 61A capability of the IRFR3708PBF. This part is appropriate only for low-current switching circuits.

Q: What is the operating temperature limitation of DMN3016LK3-13?

A: DMN3016LK3-13 operates from -55°C to 150°C (TJ), which is 25°C below the IRFR3708PBF specification of -55°C to 175°C. This limits its use in high-temperature applications.

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