IRF3315LPBF Equivalent & Substitute Parts

Part Overview

The IRF3315LPBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 150V drain-to-source voltage with 21A continuous drain current at 25°C. This device is packaged in TO-262-3 (I2PAK) configuration for through-hole mounting applications. The IRF3315LPBF is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support, maintenance, and production continuity. Substitute parts must maintain functional compatibility within the electrical and mechanical constraints of the original design.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	150	V
Continuous Drain Current (Id) @ 25°C	21	A (Tc)
On-State Resistance (Rds On) @ 12A, 10V	82	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	95	nC
Input Capacitance (Ciss) @ 25V	1300	pF
Power Dissipation (Max)	94 (Tc)	W
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-262-3	Through Hole
Gate Voltage (Max)	±20	V

Substitute Part Grouping Explanation

Substitution of the IRF3315LPBF is constrained by the following critical electrical and mechanical parameters:

Voltage Rating Requirement: The substitute must support minimum 150V Vdss to maintain voltage margin in the original circuit topology.

Current Handling Capability: The substitute must support minimum 21A continuous drain current at 25°C to ensure adequate current capacity for the application.

On-State Resistance: The substitute Rds On value must not exceed the original specification to prevent excessive power dissipation and thermal stress.

Package Compatibility: The substitute must use TO-262-3 through-hole packaging to ensure mechanical fit and thermal interface compatibility with existing PCB designs.

Gate Drive Voltage: The substitute must operate with 10V gate drive voltage and maintain compatible gate threshold voltage characteristics.

Temperature Range: The substitute must support the full operating temperature range of -55°C to 175°C (TJ).

The IRFZ14L from Vishay Siliconix does not meet the voltage rating requirement (60V vs. 150V required) and does not meet the current requirement (10A vs. 21A required). This part is therefore not a valid substitute for the IRF3315LPBF.

Parameter Comparison

Parameter	IRF3315LPBF (Infineon)	IRFZ14L (Vishay)	Compatibility
Drain-to-Source Voltage (Vdss)	150 V	60 V	Not Compatible
Continuous Drain Current (Id) @ 25°C	21 A (Tc)	10 A (Tc)	Not Compatible
On-State Resistance (Rds On)	82 mOhm @ 12A, 10V	200 mOhm @ 6A, 10V	Not Compatible
Gate Threshold Voltage (Vgs(th))	4 V @ 250µA	4 V @ 250µA	Compatible
Gate Charge (Qg) @ 10V	95 nC	11 nC	Compatible
Input Capacitance (Ciss) @ 25V	1300 pF	300 pF	Compatible
Power Dissipation (Max)	94 W (Tc)	43 W (Tc)	Not Compatible
Operating Temperature Range	-55 to 175 °C (TJ)	-55 to 175 °C (TJ)	Compatible
Package Type	TO-262-3	TO-262-3	Compatible
Gate Voltage (Max)	±20 V	±20 V	Compatible

Engineering Selection Recommendations

Based on the provided electrical specifications and product status information, the IRFZ14L does not qualify as a substitute for the IRF3315LPBF. The IRFZ14L operates at a maximum drain-to-source voltage of 60V, which is insufficient for circuits designed for the 150V rating of the IRF3315LPBF. Additionally, the IRFZ14L is rated for 10A continuous drain current, which falls below the 21A requirement of the original design.

The IRF3315LPBF is classified as obsolete. For applications requiring this device, direct replacement with an equivalent part from the same manufacturer or a qualified alternative with identical electrical and mechanical specifications is necessary. Any substitute selection must verify that all critical parameters—particularly Vdss, Id, Rds On, and package type—meet or exceed the original design requirements.

The IRFZ14L is classified as active and RoHS non-compliant, whereas the IRF3315LPBF status is obsolete with REACH unaffected classification. These differences in product status and compliance do not alter the fundamental incompatibility based on electrical ratings.

Frequently Asked Questions (FAQ)

Q: Can the IRFZ14L be used as a direct replacement for the IRF3315LPBF?

A: No. The IRFZ14L has a maximum Vdss rating of 60V compared to the IRF3315LPBF's 150V rating. Using a lower voltage-rated device in a 150V circuit creates risk of device failure and circuit malfunction. The IRFZ14L also provides only 10A continuous drain current versus the required 21A.

Q: What are the critical parameters that determine substitution eligibility?

A: Substitution eligibility is determined by: (1) Drain-to-Source Voltage (Vdss) minimum 150V, (2) Continuous Drain Current (Id) minimum 21A at 25°C, (3) On-State Resistance (Rds On) not exceeding 82 mOhm at specified conditions, (4) TO-262-3 package type for mechanical compatibility, and (5) Operating temperature range of -55°C to 175°C (TJ).

Q: Are there any gate drive compatibility concerns between these parts?

A: Both devices share identical gate threshold voltage (4V @ 250µA) and maximum gate voltage (±20V) specifications. However, gate drive compatibility is secondary to the fundamental voltage and current rating incompatibility.

Q: What is the significance of the TO-262-3 package requirement?

A: The TO-262-3 package is a through-hole configuration with specific lead geometry and thermal interface characteristics. Substitutes must use this identical package type to ensure proper PCB mounting, thermal coupling to the board, and mechanical fit within the existing design.

Q: Why is the IRF3315LPBF classified as obsolete?

A: Obsolete status indicates the part is no longer manufactured or supported by Infineon Technologies. This classification necessitates identification of equivalent alternatives for design continuity and production support.

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