IRF3315L N-Channel MOSFET 150V 21A TO-262 Equivalent & Substitute Parts

Part Overview

The IRF3315L is an N-Channel MOSFET manufactured by Infineon Technologies, designed for high-voltage switching applications requiring 150V drain-to-source voltage capability and 21A continuous drain current. This device features the HEXFET® series technology and is housed in a TO-262 through-hole package.

The IRF3315L carries an Obsolete product status. Locating equivalent or substitute components is necessary for ongoing system maintenance, repair, and new design implementations where this part is specified or required as a functional replacement.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	150	V
Continuous Drain Current (Id) @ 25°C	21	A
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) @ Ta	3.8	W
Power Dissipation (Max) @ Tc	94	W
Operating Temperature Range	-55 to 175	°C
Mounting Type	Through Hole	—
Package	TO-262-3	—

Substitute Part Grouping Explanation

Substitution of the IRF3315L requires strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

Drain-to-Source Voltage (Vdss): Must equal or exceed 150V to maintain voltage margin in the application circuit
Continuous Drain Current (Id): Must equal or exceed 21A to support the specified load current
On-State Resistance (Rds On): Lower values indicate better efficiency; values at or below 82mOhm @ specified conditions are preferred
Gate Threshold Voltage (Vgs(th)): Must remain within ±20V gate voltage specification
Operating Temperature Range: Must support -55°C to 175°C junction temperature operation
Mounting Type & Package: Must be Through Hole TO-262 or compatible variant to ensure mechanical fit and thermal performance

Substitution Logic: A part qualifies as a substitute only when all critical parameters meet or exceed the IRF3315L specifications. Parts with lower voltage or current ratings do not qualify as direct substitutes, as they cannot fulfill the same functional role in the circuit.

Parameter Comparison

Parameter	IRF3315L (Main Part)	IRFZ14L (Substitute)	Compatibility Assessment
Manufacturer	Infineon Technologies	Vishay Siliconix	Different manufacturer
Drain to Source Voltage (Vdss)	150 V	60 V	Substitute rated lower; not equivalent
Continuous Drain Current (Id) @ 25°C	21 A	10 A	Substitute rated lower; not equivalent
On-State Resistance (Rds On)	82 mOhm @ 12A, 10V	200 mOhm @ 6A, 10V	Substitute has higher resistance
Gate Threshold Voltage (Vgs(th))	4 V @ 250µA	4 V @ 250µA	Equivalent
Gate Charge (Qg) @ 10V	95 nC	11 nC	Substitute lower; faster switching
Input Capacitance (Ciss) @ 25V	1300 pF	300 pF	Substitute lower; reduced capacitive loading
Power Dissipation (Max) @ Ta	3.8 W	3.7 W	Comparable
Power Dissipation (Max) @ Tc	94 W	43 W	Substitute rated lower
Operating Temperature Range	-55 to 175 °C	-55 to 175 °C	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Package	TO-262-3	TO-262-3	Equivalent
Product Status	Obsolete	Active	Substitute is currently available

Engineering Selection Recommendations

Based on the parameter comparison, the IRFZ14L does not qualify as a direct functional equivalent to the IRF3315L. The substitute part is rated for 60V maximum drain-to-source voltage and 10A continuous drain current, both significantly lower than the IRF3315L specifications of 150V and 21A respectively.

Application Compatibility: The IRFZ14L is suitable only for applications where the circuit operates at 60V or lower and requires 10A or less continuous drain current. It cannot be used as a replacement in circuits designed for the IRF3315L's 150V/21A operating envelope.

Product Status Consideration: The IRF3315L is classified as Obsolete. The IRFZ14L is classified as Active and maintains current manufacturing availability. However, availability does not override electrical incompatibility.

Compliance & Certifications: Both parts carry identical RoHS non-compliant status, MSL Level 1 (Unlimited), ECCN EAR99, and HTSUS 8541.29.0095 classifications. Neither part provides RoHS compliance or REACH compliance advantage over the other.

Frequently Asked Questions (FAQ)

Q: Can the IRFZ14L replace the IRF3315L in my circuit?

A: No. The IRFZ14L has a maximum drain-to-source voltage rating of 60V, while the IRF3315L is rated for 150V. Additionally, the IRFZ14L supports only 10A continuous drain current compared to the IRF3315L's 21A rating. Direct substitution would result in circuit failure or component damage if the application requires the full 150V/21A capability.

Q: Why is the IRFZ14L listed if it is not compatible?

A: The IRFZ14L is presented for reference purposes only. It demonstrates the parameter comparison methodology used in equivalent part selection. Direct substitution requires matching or exceeding all critical electrical specifications.

Q: What parameters must a substitute part meet to replace the IRF3315L?

A: A qualifying substitute must meet the following minimum specifications: Vdss ≥ 150V, Id ≥ 21A @ 25°C, Vgs(th) within ±20V, operating temperature range -55°C to 175°C, and TO-262 through-hole package compatibility. On-state resistance should not exceed 82mOhm @ 12A, 10V to maintain thermal performance equivalence.

Q: Are there package alternatives to TO-262 for the IRF3315L?

A: The IRF3315L is specified in TO-262-3 Long Leads, I2PAK, TO-262AA package variants. Substitutes must maintain through-hole mounting compatibility and thermal characteristics equivalent to the TO-262 package family.

Q: What is the significance of the Gate Charge (Qg) parameter in substitution?

A: Gate charge determines the energy required to switch the MOSFET on and off. The IRF3315L requires 95nC @ 10V. A substitute with lower gate charge will switch faster and generate less heat in the gate drive circuit, but must still meet all voltage and current ratings.

Q: Does the Obsolete status of the IRF3315L affect substitution criteria?

A: Obsolete status indicates the part is no longer manufactured. This necessitates finding alternatives, but does not lower the electrical requirements for substitution. Any replacement must still meet the original 150V/21A specifications or the application circuit must be redesigned.

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