IRFR310 Equivalent & Substitute Parts

Part Overview

The IRFR310 is an N-Channel 400 V, 1.7A MOSFET manufactured by Vishay Siliconix in a surface mount DPAK package. This device is classified as obsolete, indicating discontinued production and limited availability. The IRFR310 was designed for general-purpose switching applications requiring moderate voltage and current ratings with low on-resistance characteristics.

Due to its obsolete status, identifying equivalent and substitute parts is necessary for design continuity, production support, and long-term component sourcing. Substitute parts must maintain electrical compatibility across critical parameters including drain-source voltage, continuous drain current, on-resistance, and thermal characteristics while accommodating the DPAK surface mount package format.

Key Parameters

Parameter	Value	Unit	Condition
FET Type	N-Channel	—	—
Drain to Source Voltage (Vdss)	400	V	—
Continuous Drain Current (Id)	1.7	A	Tc @ 25°C
On-Resistance (Rds On Max)	3.6	Ω	@ 1A, 10V Vgs
Gate Threshold Voltage (Vgs(th) Max)	4	V	@ 250µA Id
Gate Charge (Qg Max)	12	nC	@ 10V Vgs
Input Capacitance (Ciss Max)	170	pF	@ 25V Vds
Power Dissipation (Max)	2.5 / 25	W	Ta / Tc
Operating Temperature Range	-55 to 150	°C	Tj
Package Type	DPAK / TO-252-3	—	Surface Mount
RoHS Status	ROHS3 Compliant	—	—

Substitute Part Grouping Explanation

Substitution of the IRFR310 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-Source Voltage (Vdss): Must equal or exceed 400 V
FET Type: Must be N-Channel MOSFET
Package: Must be DPAK / TO-252-3 surface mount configuration
Technology: Must be Metal Oxide MOSFET

Secondary Compatibility Parameters:

Continuous Drain Current (Id): Substitute must meet or exceed 1.7 A at Tc
On-Resistance (Rds On): Lower or equal values indicate improved performance
Gate Threshold Voltage (Vgs(th)): Must be compatible with 10V drive voltage
Operating Temperature Range: Must encompass -55°C to 150°C or equivalent
RoHS Compliance: Must maintain ROHS3 compliance status

Substitute Parts Identified:

IRFR310PBF (Vishay Siliconix) — Parametric equivalent with identical electrical specifications; differs only in packaging format (Tube vs. standard) and product status (Active vs. Obsolete).
FDD3N40TM (onsemi) — Meets all primary criteria with enhanced specifications: 2A continuous drain current, 3.4Ω on-resistance, 30W power dissipation at Tc, and active product status.
AOD3N40 (Alpha & Omega Semiconductor Inc.) — Exceeds primary requirements with 2.6A continuous drain current, 3.1Ω on-resistance, and 50W power dissipation at Tc.
RJK4002DPD-00#J2 (Renesas Electronics Corporation) — Highest performance option with 3A continuous drain current, 2.9Ω on-resistance, and 30W power dissipation at Tc.
TN2640K4-G (Microchip Technology) — Lower current rating (500mA) with 5Ω on-resistance; suitable only for reduced current applications within the 400V voltage class.

Parameter Comparison

Parameter	IRFR310	IRFR310PBF	FDD3N40TM	AOD3N40	RJK4002DPD-00#J2	TN2640K4-G
Manufacturer	Vishay Siliconix	Vishay Siliconix	onsemi	Alpha & Omega	Renesas	Microchip
Product Status	Obsolete	Active	Active	Active	Active	Active
Vdss (V)	400	400	400	400	400	400
Id Continuous (A)	1.7	1.7	2.0	2.6	3.0	0.5
Rds On Max (Ω)	3.6	3.6	3.4	3.1	2.9	5.0
Vgs(th) Max (V)	4.0	4.0	5.0	4.5	—	2.0
Qg Max (nC)	12	12	6	5.1	6	—
Ciss Max (pF)	170	170	225	225	165	225
Power Dissipation Tc (W)	25	25	30	50	30	—
Operating Temp Range (°C)	-55 to 150	-55 to 150	-55 to 150	-50 to 150	— to 150	-55 to 150
Package	DPAK	DPAK	TO-252AA	TO-252	MP-3A	TO-252
RoHS Status	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3
Moisture Sensitivity (MSL)	1	1	1	1	1	3

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility):

IRFR310PBF is the primary direct replacement for the obsolete IRFR310. Both devices share identical electrical specifications, gate charge characteristics, and input capacitance. The only distinction is product status (Active vs. Obsolete) and packaging format (Tube). IRFR310PBF maintains full backward compatibility and requires no circuit modifications. This part is recommended for applications where the original 1.7A continuous drain current and 3.6Ω on-resistance specifications are sufficient.

Enhanced Performance Substitutes (Recommended for New Designs):

FDD3N40TM, AOD3N40, and RJK4002DPD-00#J2 are active products that exceed the IRFR310 specifications while maintaining 400V voltage rating and DPAK package compatibility. These devices offer improved on-resistance (3.4Ω, 3.1Ω, and 2.9Ω respectively) and higher continuous drain current ratings (2.0A, 2.6A, and 3.0A respectively). All three maintain ROHS3 compliance and MSL-1 moisture sensitivity ratings. These substitutes are suitable for applications requiring enhanced thermal performance or higher current capacity without circuit redesign.

Limited Current Applications:

TN2640K4-G is suitable only for applications where continuous drain current does not exceed 500mA. This device exhibits higher on-resistance (5.0Ω) and carries MSL-3 moisture sensitivity rating, requiring extended bake-out procedures. Selection of this part is appropriate only when current requirements are significantly reduced from the original IRFR310 specification.

Compliance and Regulatory Considerations:

All identified substitutes maintain ROHS3 compliance and EAR99 export classification consistent with the original IRFR310. REACH status varies: IRFR310PBF is REACH Affected, while FDD3N40TM, AOD3N40, RJK4002DPD-00#J2, and TN2640K4-G are REACH Unaffected. Selection should account for supply chain and regulatory requirements specific to end-use applications.

Frequently Asked Questions (FAQ)

Q: Can IRFR310PBF be used as a direct drop-in replacement for IRFR310?

A: Yes. IRFR310PBF is electrically and mechanically identical to IRFR310. Both devices feature 400V Vdss, 1.7A continuous drain current, 3.6Ω on-resistance, and DPAK surface mount packaging. The primary difference is product status: IRFR310PBF is active production while IRFR310 is obsolete. No circuit modifications are required.

Q: What are the key differences between IRFR310 and the enhanced substitutes (FDD3N40TM, AOD3N40, RJK4002DPD-00#J2)?

A: Enhanced substitutes maintain the 400V voltage rating and DPAK package but offer improved electrical performance: lower on-resistance (3.1Ω to 3.4Ω vs. 3.6Ω), higher continuous drain current (2.0A to 3.0A vs. 1.7A), and increased power dissipation capability (30W to 50W at Tc vs. 25W). These improvements reduce heat generation and enable higher current applications. All maintain ROHS3 compliance and are suitable for direct substitution in existing designs.

Q: Is TN2640K4-G suitable for applications currently using IRFR310?

A: TN2640K4-G is not recommended as a general substitute for IRFR310. This device is rated for only 500mA continuous drain current compared to IRFR310's 1.7A, representing a 71% reduction in current capacity. Additionally, TN2640K4-G carries MSL-3 moisture sensitivity rating versus MSL-1 for IRFR310, requiring extended bake-out procedures. Selection of TN2640K4-G is appropriate only for applications where continuous drain current does not exceed 500mA.

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

A: All substitute parts are available in DPAK-compatible surface mount packages: IRFR310PBF (DPAK), FDD3N40TM (TO-252AA), AOD3N40 (TO-252), RJK4002DPD-00#J2 (MP-3A), and TN2640K4-G (TO-252). While package designations vary slightly, all are mechanically compatible with standard DPAK footprints and require no PCB layout modifications.

Q: What is the impact of lower on-resistance in substitute parts?

A: Lower on-resistance (Rds On) directly reduces power dissipation during conduction. For example, AOD3N40 at 3.1Ω versus IRFR310 at 3.6Ω represents approximately 14% reduction in resistive losses at equivalent current levels. This improvement reduces junction temperature rise, extends device lifetime, and decreases thermal management requirements. Lower on-resistance is beneficial in all applications and introduces no compatibility concerns.

Q: Do substitute parts require different gate drive voltage?

A: All substitute parts operate with 10V gate drive voltage consistent with IRFR310. Gate threshold voltages (Vgs(th)) range from 2.0V to 5.0V across substitutes, all compatible with standard 10V drive circuits. No modifications to gate drive circuitry are required for any identified substitute.

Q: What is the significance of MSL rating differences?

A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to ambient conditions (30°C, 60% relative humidity) before requiring bake-out. IRFR310, IRFR310PBF, FDD3N40TM, AOD3N40, and RJK4002DPD-00#J2 carry MSL-1 (Unlimited), requiring no special moisture handling. TN2640K4-G carries MSL-3 (168 Hours), requiring bake-out procedures if exposed to ambient conditions beyond 168 hours. MSL-1 rated parts are preferred for standard manufacturing environments.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All identified substitute parts (IRFR310PBF, FDD3N40TM, AOD3N40, RJK4002DPD-00#J2, and TN2640K4-G) maintain ROHS3 compliance consistent with the original IRFR310. All are suitable for applications requiring RoHS certification.

Q: What inventory considerations apply to these substitutes?

A: IRFR310PBF offers the highest inventory availability (22,900 pcs) among active substitutes. FDD3N40TM (19,769 pcs), AOD3N40 (20,200 pcs), and TN2640K4-G (20,495 pcs) maintain substantial stock levels. RJK4002DPD-00#J2 (6,903 pcs) and original IRFR310 (6,968 pcs) have lower availability. For long-term production support, IRFR310PBF, FDD3N40TM, AOD3N40, or TN2640K4-G are recommended due to active product status and higher inventory levels.

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