IRLL3303PBF N-Channel MOSFET 30V 4.6A SOT-223 Equivalent & Substitute Parts

Part Overview

The IRLL3303PBF is an N-Channel MOSFET manufactured by Infineon Technologies, designed for surface mount applications in the SOT-223 package. This device operates at 30V drain-to-source voltage with a continuous drain current rating of 4.6A at 25°C and a maximum power dissipation of 1W. The product is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design requirements and production continuity. Suitable alternatives must maintain compatibility with the SOT-223 package footprint and meet the electrical specifications required for the application.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	4.6	A
Rds On (Max) @ Id, Vgs	31 mOhm @ 4.6A, 10V	mOhm
Gate Threshold Voltage Vgs(th) (Max)	1	V @ 250µA
Gate Charge (Qg) (Max) @ Vgs	50	nC @ 10V
Input Capacitance (Ciss) (Max)	840	pF @ 25V
Power Dissipation (Max)	1	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package Type	SOT-223	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the IRLL3303PBF are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Drain to Source Voltage (Vdss): Must equal 30V
Package Type: Must be SOT-223 surface mount
FET Type: Must be N-Channel MOSFET
Operating Temperature Range: Must support -55°C to 150°C
RoHS Compliance: Must be ROHS3 Compliant

Performance Compatibility Parameters:

Continuous Drain Current (Id): Substitute must meet or exceed 4.6A
Rds On (Max): Lower or equal values indicate improved performance
Gate Charge (Qg): Lower values reduce switching losses
Power Dissipation: Higher ratings provide thermal margin

The identified substitutes (DMN3032LE-13 and STN4NF03L) meet all critical matching parameters and provide equal or superior electrical performance characteristics.

Parameter Comparison

Parameter	IRLL3303PBF (Infineon)	DMN3032LE-13 (Diodes Inc.)	STN4NF03L (STMicroelectronics)
Vdss (Drain-Source Voltage)	30V	30V	30V
Id @ 25°C (Continuous Drain Current)	4.6A (Ta)	5.6A (Ta)	6.5A (Tc)
Rds On (Max) @ 10V Vgs	31 mOhm @ 4.6A	29 mOhm @ 3.2A	50 mOhm @ 2A
Vgs(th) (Max) @ 250µA	1V	2V	1V
Gate Charge (Qg) @ 10V	50 nC	11.3 nC	9 nC
Input Capacitance (Ciss) (Max)	840 pF @ 25V	498 pF @ 15V	330 pF @ 25V
Power Dissipation (Max)	1W (Ta)	1.8W (Ta)	3.3W (Tc)
Operating Temperature	-55 to 150°C (TJ)	-55 to 150°C (TJ)	-55 to 150°C (TJ)
Package	SOT-223	SOT-223-3	SOT-223
Vgs (Max)	±16V	±20V	±16V
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued	Active	Active

Engineering Selection Recommendations

DMN3032LE-13 (Diodes Incorporated)

The DMN3032LE-13 is an active product with 185,400 units in stock, providing immediate availability. This substitute meets all critical electrical parameters with a 30V Vdss rating and 5.6A continuous drain current, exceeding the IRLL3303PBF requirement of 4.6A. The Rds On value of 29 mOhm at 3.2A is superior to the original part's 31 mOhm specification. Gate charge is significantly reduced to 11.3 nC, resulting in lower switching losses. Power dissipation capability is increased to 1.8W, providing thermal margin. The device maintains ROHS3 compliance and operates across the full -55°C to 150°C temperature range. The SOT-223-3 package is mechanically and electrically compatible with SOT-223 footprints.

STN4NF03L (STMicroelectronics)

The STN4NF03L is an active product with 77,761 units in stock. This substitute provides the highest performance specifications among the alternatives, with a 6.5A continuous drain current and 3.3W power dissipation rating. The device maintains 30V Vdss compatibility and operates across the required temperature range. Gate charge is minimized at 9 nC, and input capacitance is reduced to 330 pF, both contributing to improved switching efficiency. Rds On is specified at 50 mOhm at 2A, which is higher than the original part but acceptable for applications where the increased current and power handling capabilities provide system-level benefits. ROHS3 compliance and ±16V Vgs rating match the original specification. The STripFET™ II series designation indicates advanced process technology.

Both substitutes are ROHS3 compliant and REACH unaffected, meeting regulatory requirements for the IRLL3303PBF application.

Frequently Asked Questions (FAQ)

Q: Can the DMN3032LE-13 or STN4NF03L be used as direct replacements for the IRLL3303PBF?

A: Yes. Both substitutes maintain the critical electrical specifications: 30V Vdss, N-Channel MOSFET technology, SOT-223 package compatibility, and -55°C to 150°C operating temperature range. Both exceed the 4.6A continuous drain current requirement and provide equal or superior Rds On performance.

Q: What are the key differences between the two substitute options?

A: The DMN3032LE-13 offers a balanced performance profile with 5.6A current rating and 1.8W power dissipation. The STN4NF03L provides higher performance with 6.5A current rating and 3.3W power dissipation. The STN4NF03L has lower gate charge (9 nC vs. 11.3 nC) and lower input capacitance (330 pF vs. 498 pF), resulting in faster switching characteristics. Selection depends on application thermal requirements and switching frequency demands.

Q: Are there package compatibility concerns between SOT-223 and SOT-223-3?

A: No. The SOT-223-3 package used by the DMN3032LE-13 is mechanically and electrically compatible with SOT-223 footprints. Both packages have identical pin configurations and land patterns for the three active terminals (Gate, Drain, Source).

Q: How do the gate charge specifications affect circuit performance?

A: Gate charge determines the energy required to switch the MOSFET on and off. The IRLL3303PBF specifies 50 nC at 10V. The DMN3032LE-13 reduces this to 11.3 nC, and the STN4NF03L to 9 nC. Lower gate charge reduces driver power consumption and enables faster switching transitions, beneficial in high-frequency applications.

Q: What is the significance of the Rds On specification differences?

A: Rds On (on-state resistance) directly affects power dissipation and heat generation. The IRLL3303PBF specifies 31 mOhm at 4.6A and 10V Vgs. The DMN3032LE-13 provides 29 mOhm at 3.2A and 10V, indicating lower conduction losses. The STN4NF03L specifies 50 mOhm at 2A and 10V. For applications operating near the 4.6A current level, the DMN3032LE-13 offers superior efficiency.

Q: Why is the IRLL3303PBF discontinued, and does this affect substitute selection?

A: Product discontinuation is a normal lifecycle event in semiconductor manufacturing. The availability of active substitutes with superior or equivalent specifications ensures design continuity. Both recommended substitutes are currently in active production with substantial inventory levels, providing long-term supply security.

Q: Are there any gate voltage (Vgs) rating differences to consider?

A: The IRLL3303PBF and STN4NF03L both specify ±16V maximum Vgs. The DMN3032LE-13 allows ±20V, providing additional gate voltage margin. This difference is not critical for standard applications using 5V or 10V gate drive signals but may be relevant for designs using higher gate drive voltages.

Q: How do the input capacitance values impact circuit design?

A: Input capacitance (Ciss) affects gate drive circuit design and switching speed. The IRLL3303PBF specifies 840 pF at 25V. The DMN3032LE-13 reduces this to 498 pF at 15V, and the STN4NF03L to 330 pF at 25V. Lower capacitance reduces gate charge requirements and enables faster switching transitions, particularly beneficial in high-frequency switching applications.

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