Equivalent & Substitute Parts for IRL3303 N-Channel 30V 38A MOSFET

Part Overview

The IRL3303 is an N-Channel MOSFET manufactured by Infineon Technologies in the HEXFET® series, rated for 30V drain-source voltage and 38A continuous drain current at 25°C. The device is packaged in TO-220AB through-hole configuration with a maximum power dissipation of 68W. The IRL3303 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts must maintain compatibility with the original electrical specifications and mechanical form factor while offering active product status or improved performance characteristics.

Key Parameters

Parameter	IRL3303 Value	Unit
Drain-Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	38	A
On-State Resistance (Rds On) @ 20A, 10V	26	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	1	V
Gate Charge (Qg) @ 4.5V	26	nC
Input Capacitance (Ciss) @ 25V	870	pF
Power Dissipation (Max)	68	W
Operating Temperature Range	-55 to 175	°C
Package Type	TO-220AB	Through Hole
FET Type	N-Channel	—
Technology	MOSFET (Metal Oxide)	—

Substitute Part Grouping Explanation

Substitute parts for the IRL3303 are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Mandatory Compatibility Criteria:

FET Type: N-Channel (all substitutes)
Package: TO-220-3 or TO-220AB through-hole configuration
Drain-Source Voltage (Vdss): Equal to or greater than 30V
Continuous Drain Current (Id): Equal to or greater than 38A at 25°C
Operating Temperature Range: -55°C to 175°C (matching or exceeding)

Substitution Groups:

Group 1 – Direct Voltage/Current Match (30V, ≥38A): Parts maintaining 30V Vdss with drain current ratings at or above 38A. These include IRLB8721PBF (62A), PSMN2R0-30PL,127 (100A), PSMN4R3-30PL,127 (100A), and PSMN022-30PL,127 (30A). These parts are electrically interchangeable within the 30V class.

Group 2 – Elevated Voltage Class (40V, ≥38A): Parts rated for 40V Vdss with equivalent or higher current ratings. These include IPP015N04NGXKSA1 (120A) and PSMN2R2-40PS,127 (100A). These parts provide additional voltage margin and are suitable for applications where higher voltage headroom is acceptable.

Group 3 – Similar Voltage/Current Profile (30-33V, 40-62A): Parts with comparable electrical ratings including STP40NF03L (30V, 40A) and STP62NS04Z (33V, 62A). These maintain close alignment with the original part's performance envelope.

All substitute parts share the same operating temperature range (-55°C to 175°C), RoHS compliance status (ROHS3 Compliant or equivalent), and through-hole mounting configuration.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Qg (nC)	Ciss (pF)	Pd Max (W)	Package	Status
IRL3303	Infineon	30	38	26 @ 20A, 10V	26 @ 4.5V	870 @ 25V	68	TO-220AB	Obsolete
IRLB8721PBF	Infineon	30	62	8.7 @ 31A, 10V	13 @ 4.5V	1077 @ 15V	65	TO-220AB	Active
PSMN022-30PL,127	Nexperia	30	30	22 @ 5A, 10V	9 @ 10V	447 @ 15V	41	TO-220AB	Obsolete
PSMN2R0-30PL,127	Nexperia	30	100	2.1 @ 15A, 10V	117 @ 10V	6810 @ 12V	211	TO-220AB	Obsolete
PSMN2R2-40PS,127	Nexperia	40	100	2.1 @ 25A, 10V	130 @ 10V	8423 @ 20V	306	TO-220AB	Obsolete
PSMN4R3-30PL,127	Nexperia	30	100	4.3 @ 15A, 10V	41.5 @ 10V	2400 @ 12V	103	TO-220AB	Obsolete
STP40NF03L	STMicroelectronics	30	40	22 @ 20A, 10V	15 @ 4.5V	770 @ 25V	70	TO-220	Not For New Designs
STP62NS04Z	STMicroelectronics	33	62	15 @ 30A, 10V	47 @ 10V	1330 @ 25V	110	TO-220	Obsolete
IPP015N04NGXKSA1	Infineon	40	120	1.5 @ 100A, 10V	250 @ 10V	20000 @ 20V	250	PG-TO220-3-1	Active

Engineering Selection Recommendations

For Direct Replacement (Minimum Disruption):

IRLB8721PBF is the primary recommended substitute. It maintains the 30V Vdss rating of the IRL3303, offers higher continuous drain current (62A versus 38A), and is classified as Active product status. The IRLB8721PBF is manufactured by Infineon Technologies in the same HEXFET® series, ensuring design continuity. The part is packaged in TO-220AB, providing mechanical compatibility. RoHS3 compliance status exceeds the non-compliant status of the original part.

For Applications Requiring Higher Current Capacity:

PSMN2R0-30PL,127 or PSMN4R3-30PL,127 provide 100A continuous drain current at 30V, suitable for designs requiring significant current margin. Both parts maintain the 30V voltage class and TO-220AB packaging. Note that both are classified as Obsolete; however, they remain available in inventory (10,198 and 5,596 units respectively).

For Applications Accepting Higher Voltage Rating:

IPP015N04NGXKSA1 is classified as Active product status and offers 40V Vdss with 120A continuous drain current. This part is suitable for new designs and provides the highest performance margin. The elevated voltage rating (40V versus 30V) is acceptable in applications where circuit design permits. The part is packaged in PG-TO220-3-1, which is mechanically compatible with TO-220-3 footprints.

For Cost-Optimized Selection:

STP40NF03L provides electrical characteristics closely matching the IRL3303 (30V, 40A) with similar on-state resistance (22 mOhm). The part is manufactured by STMicroelectronics and is packaged in TO-220. Product status is Not For New Designs; however, it remains available in inventory (15,426 units).

Compliance Considerations:

All recommended substitutes maintain RoHS3 compliance and REACH Unaffected status, matching or exceeding the regulatory requirements of the original part. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts, indicating no special handling requirements.

Frequently Asked Questions (FAQ)

Q1: Can IRLB8721PBF be used as a direct drop-in replacement for IRL3303?

A: Yes. IRLB8721PBF is electrically and mechanically compatible. Both parts are N-Channel MOSFETs rated for 30V Vdss, packaged in TO-220AB, and operate across the same temperature range (-55°C to 175°C). The IRLB8721PBF provides higher continuous drain current (62A versus 38A), making it suitable for the same applications with additional current margin. No circuit modifications are required.

Q2: What is the difference between 30V and 40V rated MOSFETs in terms of substitution?

A: The voltage rating indicates the maximum drain-source voltage the device can withstand. A 40V-rated MOSFET (such as IPP015N04NGXKSA1 or PSMN2R2-40PS,127) can be used in circuits designed for 30V operation, as it provides additional voltage headroom. However, a 30V-rated MOSFET cannot be used in a 40V circuit. Substitution from 30V to 40V is always acceptable; the reverse is not.

Q3: Why do some substitute parts have significantly lower on-state resistance (Rds On)?

A: Lower on-state resistance indicates improved switching efficiency and reduced power dissipation during conduction. Parts such as PSMN2R0-30PL,127 (2.1 mOhm) and IPP015N04NGXKSA1 (1.5 mOhm) represent newer technology generations with enhanced performance. Lower Rds On reduces heat generation and improves overall circuit efficiency, making these parts suitable for high-current applications.

Q4: Are all substitute parts available in the same package?

A: Most substitute parts are packaged in TO-220AB or TO-220-3, which are mechanically compatible. IPP015N04NGXKSA1 uses PG-TO220-3-1 packaging, which is also compatible with standard TO-220-3 PCB footprints. All parts are through-hole mounted, maintaining the same board-level integration approach as the original IRL3303.

Q5: What does "Obsolete" product status mean for substitution purposes?

A: Obsolete status indicates the manufacturer has discontinued active production and support for the part. However, obsolete parts may remain available through inventory channels. For new designs, Active status parts (such as IRLB8721PBF or IPP015N04NGXKSA1) are preferred. For existing designs requiring replacement, obsolete parts with available inventory remain viable substitutes if electrical and mechanical specifications match.

Q6: How do gate charge (Qg) differences affect circuit design?

A: Gate charge determines the energy required to switch the MOSFET on and off. Higher gate charge (such as 250 nC in IPP015N04NGXKSA1) requires more driver current or longer switching times. Lower gate charge (such as 13 nC in IRLB8721PBF) enables faster switching and reduces driver power consumption. For most applications, gate charge differences do not require circuit redesign; however, high-frequency switching circuits may benefit from lower gate charge values.

Q7: Can PSMN022-30PL,127 be used as a substitute despite its lower current rating (30A)?

A: PSMN022-30PL,127 is rated for 30A continuous drain current, which is below the IRL3303 specification of 38A. This part is not suitable as a direct substitute for applications requiring the full 38A rating. However, it may be acceptable for applications operating below 30A. Verification of actual circuit current requirements is necessary before selecting this part.

Q8: What is the significance of input capacitance (Ciss) in MOSFET selection?

A: Input capacitance affects gate drive requirements and switching speed. Higher Ciss (such as 20,000 pF in IPP015N04NGXKSA1) requires more gate charge and may slow switching transitions. Lower Ciss (such as 447 pF in PSMN022-30PL,127) enables faster switching. For most DC switching applications, Ciss differences have minimal impact; however, high-frequency applications may require consideration of this parameter.

Q9: Are there any thermal considerations when substituting MOSFETs?

A: Yes. Power dissipation (Pd Max) varies among substitute parts. The IRL3303 is rated for 68W maximum dissipation. Substitutes with higher Pd ratings (such as PSMN2R0-30PL,127 at 211W or IPP015N04NGXKSA1 at 250W) provide greater thermal margin and may reduce heatsink requirements. Conversely, parts with lower Pd ratings require careful thermal management. Actual power dissipation depends on circuit operating conditions and on-state resistance.

Q10: What compliance certifications should be verified for substitute parts?

A: All recommended substitute parts maintain RoHS3 compliance and REACH Unaffected status, meeting current regulatory requirements. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts, indicating no special moisture control during storage or handling. ECCN and HTSUS classifications are identical across all parts, ensuring consistent export and import compliance.

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