IRFU3910 N-Channel MOSFET 100V 16A Equivalent & Substitute Parts

Part Overview

The IRFU3910 is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 100V drain-to-source voltage and 16A continuous drain current in an IPAK (TO-251AA) through-hole package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and production requirements. The IRFU3910 belongs to the HEXFET® series and is designed for applications requiring moderate voltage and current switching capabilities with through-hole mounting.

Key Parameters

Parameter	Value	Condition
Drain-to-Source Voltage (Vdss)	100 V	Maximum rating
Continuous Drain Current (Id)	16 A	@ 25°C (Tc)
On-State Resistance (Rds On)	115 mOhm	@ 10A, 10V Vgs
Gate Threshold Voltage (Vgs(th))	4 V	@ 250 µA
Gate Charge (Qg)	44 nC	@ 10V Vgs
Input Capacitance (Ciss)	640 pF	@ 25V Vds
Power Dissipation	79 W	@ Tc
Operating Temperature Range	-55°C to 175°C	Junction temperature (TJ)
Package Type	TO-251-3 (IPAK)	Through-hole
Gate Voltage Range	±20 V	Maximum

Substitute Part Grouping Explanation

Substitution of the IRFU3910 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): 100V minimum
Continuous Drain Current (Id): 16A minimum @ 25°C
Package Type: TO-251-3 (IPAK) through-hole configuration
FET Type: N-Channel MOSFET technology
On-State Resistance (Rds On): 115 mOhm or lower @ specified conditions
Operating Temperature Range: Support for -55°C to 175°C minimum

Direct Equivalent Classification: Parts meeting all primary criteria with identical or superior electrical performance are classified as direct equivalents. The IRFU3910PBF is a direct equivalent manufactured by Infineon Technologies, differing only in packaging format (tube vs. loose) and product status (active vs. obsolete).

Functional Substitute Classification: Parts meeting voltage and current ratings with minor variations in secondary parameters (gate charge, input capacitance, power dissipation) are classified as functional substitutes. The 2SK3484-AZ from Renesas Electronics Corporation qualifies as a functional substitute, with equivalent voltage and current ratings but different thermal and capacitive characteristics.

Parameter Comparison

Parameter	IRFU3910	IRFU3910PBF	2SK3484-AZ	Unit
Manufacturer	Infineon Technologies	Infineon Technologies	Renesas Electronics	—
Product Status	Obsolete	Active	Obsolete	—
Vdss (Drain-Source Voltage)	100	100	100	V
Id (Continuous Drain Current @ 25°C)	16	16	16	A
Rds On (Max) @ Id, Vgs	115 @ 10A, 10V	115 @ 10A, 10V	125 @ 8A, 10V	mOhm
Vgs(th) (Gate Threshold)	4 @ 250 µA	4 @ 250 µA	Not specified	V
Qg (Gate Charge) @ 10V	44	44	20	nC
Ciss (Input Capacitance) @ Vds	640 @ 25V	640 @ 25V	900 @ 10V	pF
Power Dissipation (Max)	79 @ Tc	79 @ Tc	30 @ Tc	W
Operating Temperature Range	-55 to 175	-55 to 175	Up to 150	°C
Package Type	TO-251-3 (IPAK)	TO-251-3 (IPAK)	TO-251-3 (IPAK)	—
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	—
Mounting Type	Through-hole	Through-hole	Through-hole	—

Engineering Selection Recommendations

IRFU3910PBF (Direct Equivalent - Recommended Primary Choice)

The IRFU3910PBF is the preferred substitute for the obsolete IRFU3910. Both parts are manufactured by Infineon Technologies and share identical electrical specifications, gate charge characteristics, and thermal performance. The IRFU3910PBF is currently in active production status with 59,098 units in stock, ensuring long-term availability. The primary distinction is packaging format: IRFU3910PBF is supplied in tube packaging, while the original IRFU3910 was supplied loose. Both conform to ROHS3 compliance standards, with IRFU3910PBF offering improved environmental compliance compared to the non-compliant original part. Pin configuration and footprint are identical, requiring no circuit board modifications.

2SK3484-AZ (Functional Substitute - Secondary Option)

The 2SK3484-AZ from Renesas Electronics Corporation is a functional substitute meeting the core voltage (100V) and current (16A) requirements. This part exhibits lower gate charge (20 nC vs. 44 nC), resulting in faster switching characteristics suitable for high-frequency applications. However, the 2SK3484-AZ has reduced power dissipation capability (30W @ Tc vs. 79W @ Tc) and a lower maximum operating temperature (150°C vs. 175°C). The 2SK3484-AZ is also classified as obsolete with 3,680 units in stock. Selection of this substitute requires verification that application thermal and frequency requirements align with its reduced power dissipation rating. Both parts share identical TO-251-3 package geometry and pin configuration.

Compliance and Regulatory Considerations

For new designs or production requiring RoHS compliance, IRFU3910PBF is the mandatory choice, as it meets ROHS3 standards while the original IRFU3910 does not. Both substitute options are REACH unaffected and classified under ECCN EAR99 for export control purposes.

Frequently Asked Questions (FAQ)

Q: Can IRFU3910PBF be used as a direct replacement for IRFU3910 without circuit modifications?

A: Yes. The IRFU3910PBF is electrically and mechanically identical to the IRFU3910. Both parts share the same pin configuration, electrical specifications, and TO-251-3 package footprint. No circuit board layout changes or design modifications are required. The only difference is packaging format (tube vs. loose).

Q: What are the key differences between IRFU3910PBF and 2SK3484-AZ?

A: Both parts meet the 100V/16A core requirements and use identical TO-251-3 packages. The primary differences are: (1) Gate charge is significantly lower in 2SK3484-AZ (20 nC vs. 44 nC), enabling faster switching; (2) Power dissipation is reduced in 2SK3484-AZ (30W vs. 79W @ Tc), limiting thermal performance; (3) Maximum operating temperature is lower in 2SK3484-AZ (150°C vs. 175°C); (4) On-state resistance is slightly higher in 2SK3484-AZ (125 mOhm vs. 115 mOhm). Selection depends on application thermal budget and switching frequency requirements.

Q: Is the IRFU3910PBF RoHS compliant?

A: Yes. The IRFU3910PBF is ROHS3 compliant. The original IRFU3910 is not RoHS compliant. For applications requiring RoHS certification, IRFU3910PBF is the required choice.

Q: Can 2SK3484-AZ be used in high-temperature applications above 150°C?

A: No. The 2SK3484-AZ has a maximum operating temperature of 150°C, compared to 175°C for IRFU3910 and IRFU3910PBF. Applications requiring operation above 150°C must use IRFU3910PBF.

Q: What is the impact of lower gate charge in 2SK3484-AZ on circuit design?

A: Lower gate charge (20 nC vs. 44 nC) reduces the energy required to switch the transistor, enabling faster switching transitions and lower gate drive power consumption. This is beneficial in high-frequency switching applications. However, this does not affect DC operating point or static electrical characteristics. Gate drive circuits designed for IRFU3910 will function with 2SK3484-AZ, though switching speed will be faster.

Q: Are all three parts (IRFU3910, IRFU3910PBF, 2SK3484-AZ) pin-compatible?

A: Yes. All three parts use the TO-251-3 (IPAK) package with identical pin configuration and footprint. Direct PCB substitution is possible without layout modifications.

Q: Why is the original IRFU3910 classified as obsolete?

A: The IRFU3910 is obsolete due to manufacturer discontinuation. The IRFU3910PBF remains in active production as the current equivalent. For new designs and ongoing production, IRFU3910PBF should be specified.

Q: What is the difference between IRFU3910 and IRFU3910PBF packaging?

A: IRFU3910PBF is supplied in tube packaging for automated assembly, while IRFU3910 was supplied in bulk or loose form. Electrical and mechanical specifications are identical. Tube packaging is standard for current production and improves handling efficiency in manufacturing environments.

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