IRFR3708 N-Channel MOSFET 30V 61A Equivalent & Substitute Parts

Part Overview

The IRFR3708 is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 30V drain-to-source voltage with 61A continuous drain current at 25°C. The device is housed in a TO-252AA (DPAK) surface mount package and is part of the HEXFET® series. The IRFR3708 is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support, production continuity, and component sourcing.

Substiute Parts

IRFR3708

Infineon TechnologiesIn Stock: 18888IRFR3708 Datasheet

Current PartRFQ

IPD135N03LGATMA1

Infineon TechnologiesIn Stock: 32529IPD135N03LGATMA1 Datasheet

MFR RecommendedRFQ

IPD30N03S2L20ATMA1

Infineon TechnologiesIn Stock: 6096IPD30N03S2L20ATMA1 Datasheet

MFR RecommendedRFQ

BUK9214-30A,118

Nexperia USA Inc.In Stock: 18336BUK9214-30A,118 Datasheet

MFR RecommendedRFQ

DMN3016LK3-13

Diodes IncorporatedIn Stock: 30777DMN3016LK3-13 Datasheet

MFR RecommendedRFQ

FDD6690A

onsemiIn Stock: 38078FDD6690A Datasheet

MFR RecommendedRFQ

NTD4813NHT4G

onsemiIn Stock: 40745NTD4813NHT4G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IRFR3708 is determined by strict electrical and mechanical compatibility within the following parameters:

Primary Substitution Criteria:

• Drain-to-Source Voltage (Vdss): Must equal or exceed 30V
• Continuous Drain Current (Id): Must meet or exceed 61A at 25°C
• On-Resistance (Rds On): Must not significantly exceed 12.5 mOhm to maintain thermal performance
• Package Type: Must be TO-252-3 (DPAK) surface mount
• Gate Threshold Voltage (Vgs(th)): Must be compatible with 2V specification
• Operating Temperature Range: Must support -55°C to 175°C

Substitution Logic: Parts are grouped into two categories based on current rating capability:

1. Direct Current Equivalents (≥61A): Parts meeting or exceeding the 61A continuous drain current specification, suitable for direct replacement in applications requiring full current capacity.

2. Reduced Current Substitutes (<61A): Parts with lower continuous drain current ratings but compatible voltage, package, and thermal characteristics. These are suitable for applications where the full 61A capacity is not required.

Parameter Comparison

Engineering Selection Recommendations

Direct Current Equivalents (≥61A):

The BUK9214-30A,118 from Nexperia is the only substitute meeting the full 61A continuous drain current specification. This part delivers 63A (Tc) with 12 mOhm on-resistance, exceeding the IRFR3708 performance in current capacity and power dissipation (107W vs. 87W). The BUK9214-30A,118 is AEC-Q101 qualified for automotive applications and is ROHS3 compliant. However, it is classified as obsolete, limiting long-term availability.

Reduced Current Substitutes (40–46A Range):

The NTD4813NHT4G (onsemi) and FDD6690A (onsemi) provide 40A and 46A continuous drain current respectively, with on-resistance values of 13 mOhm and 12 mOhm. Both devices support the full -55°C to 175°C operating temperature range and are ROHS3 compliant. The NTD4813NHT4G is active in production, while the FDD6690A is obsolete.

Reduced Current Substitutes (30A Range):

The IPD135N03LGATMA1 and IPD30N03S2L20ATMA1 (both Infineon OptiMOS™ series) provide 30A continuous drain current with on-resistance values of 13.5 mOhm and 20 mOhm respectively. Both are active products with ROHS3 compliance and full temperature range support. The IPD135N03LGATMA1 offers superior on-resistance performance within this group.

Low Current Substitute (<15A):

The DMN3016LK3-13 (Diodes Incorporated) provides only 12.4A continuous drain current and is suitable only for applications with significantly reduced current requirements. Operating temperature range is limited to -55°C to 150°C. This part is active and ROHS3 compliant.

Compliance Considerations:

All active substitute parts are ROHS3 compliant, addressing environmental and regulatory requirements. The IRFR3708 is RoHS non-compliant. For new designs or production requiring RoHS compliance, active parts (IPD135N03LGATMA1, IPD30N03S2L20ATMA1, NTD4813NHT4G, DMN3016LK3-13) are required.

Frequently Asked Questions (FAQ)

Q: Can the BUK9214-30A,118 directly replace the IRFR3708?

A: Yes, the BUK9214-30A,118 meets all electrical and mechanical requirements for direct replacement. It provides 63A continuous drain current (exceeding the 61A specification), 12 mOhm on-resistance, and identical TO-252-3 (DPAK) packaging. However, both parts are classified as obsolete, limiting future availability.

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

A: Tc (case temperature) and Ta (ambient temperature) represent different measurement conditions. Tc ratings assume controlled case temperature (typically 25°C), while Ta ratings assume ambient temperature conditions. The IRFR3708 specifies 61A at Tc. Substitute parts using Ta ratings (such as DMN3016LK3-13 at 12.4A Ta) indicate lower sustained current capability under ambient conditions.

Q: Can I use the IPD135N03LGATMA1 in place of the IRFR3708?

A: The IPD135N03LGATMA1 is suitable for applications where continuous drain current does not exceed 30A. It provides compatible voltage (30V), package (TO-252-3 DPAK), and operating temperature range (-55°C to 175°C). On-resistance is 13.5 mOhm, slightly higher than the IRFR3708. This part is active and ROHS3 compliant, making it preferable for new designs.

Q: Why do some substitutes have lower power dissipation ratings?

A: Power dissipation is directly related to continuous drain current and on-resistance. Parts with lower current ratings (such as DMN3016LK3-13 at 12.4A) inherently have lower power dissipation (1.6W). These parts are suitable only for low-current applications and cannot replace the IRFR3708 in high-current designs.

Q: Are all substitute parts available in the same package?

A: Yes, all substitute parts listed are housed in TO-252-3 (DPAK) surface mount packaging, ensuring mechanical compatibility with the IRFR3708. Pinout and thermal characteristics are identical across all listed parts.

Q: Which substitute offers the best long-term availability?

A: The IPD135N03LGATMA1, IPD30N03S2L20ATMA1, NTD4813NHT4G, and DMN3016LK3-13 are all classified as active products. Among these, the IPD135N03LGATMA1 and NTD4813NHT4G offer the best balance of current capacity (30A and 40A respectively) and production status. For applications requiring the full 61A capacity, no active substitute is available; the BUK9214-30A,118 is the only option but is obsolete.

Q: What is the impact of gate charge (Qg) differences on circuit design?

A: Gate charge affects switching speed and driver circuit requirements. The IRFR3708 specifies 24 nC at 4.5V. Substitutes range from 10 nC (IPD135N03LGATMA1, NTD4813NHT4G) to 31 nC (BUK9214-30A,118). Lower gate charge enables faster switching and reduces driver power consumption. Higher gate charge may require stronger gate drive circuits but does not prevent substitution if the driver is capable.

Q: Is RoHS compliance mandatory for my application?

A: RoHS compliance is mandatory for products sold in the European Union and many other markets. The IRFR3708 is RoHS non-compliant. All active substitute parts (IPD135N03LGATMA1, IPD30N03S2L20ATMA1, NTD4813NHT4G, DMN3016LK3-13) are ROHS3 compliant. For new designs or production requiring regulatory compliance, active parts must be selected.

Q: Can I use multiple lower-current devices in parallel to achieve 61A?

A: Parallel operation of MOSFETs is not addressed by the provided electrical parameters and falls outside the scope of direct substitution. Circuit design considerations for parallel operation require additional analysis beyond component-level equivalence.