IRLL1503 N-Channel MOSFET 30V 75A Equivalent & Substitute Parts

Part Overview

The IRLL1503 is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 30V drain-to-source voltage with 75A continuous drain current at 25°C. This device is packaged in SOT-223 (TO-261-4/TO-261AA) configuration and is designed for through-hole mounting applications. The IRLL1503 is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	75	A
On-Resistance (Rds On) @ 140A, 10V	3.3	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	200	nC
Input Capacitance (Ciss) @ 25V	5730	pF
Package Type	SOT-223 (TO-261-4/TO-261AA)	—
Mounting Type	Through Hole	—
RoHS Status	Non-compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the IRLL1503 is determined by the following critical parameters:

Primary Matching Criteria:

FET Type: N-Channel
Drain to Source Voltage (Vdss): 30V minimum
Package/Case: SOT-223 (TO-261-4/TO-261AA)
Continuous Drain Current (Id): 75A or greater at 25°C

Secondary Compatibility Factors:

On-Resistance (Rds On): 3.3 mOhm or lower at specified conditions
Gate Threshold Voltage (Vgs(th)): 4V or lower
Gate Charge (Qg): 200 nC or lower
Input Capacitance (Ciss): 5730 pF or lower

The IRLL1503TR from Vishay Siliconix shares the same base part number designation (IRLL1503), identical package configuration (SOT-223), matching voltage rating (30V), and equivalent FET technology (N-Channel MOSFET). The primary distinction is mounting type: the IRLL1503TR is surface-mount, whereas the original IRLL1503 is through-hole. This difference requires circuit board redesign and is not a direct pin-compatible substitute.

Parameter Comparison

Parameter	IRLL1503 (Infineon)	IRLL1503TR (Vishay)	Match Status
Manufacturer	Infineon Technologies	Vishay Siliconix	Different
FET Type	N-Channel	N-Channel	Match
Technology	MOSFET (Metal Oxide)	MOSFET (Metal Oxide)	Match
Drain to Source Voltage (Vdss)	30V	30V	Match
Continuous Drain Current (Id) @ 25°C	75A	Not specified	Partial
Package/Case	TO-261-4, TO-261AA	TO-261-4, TO-261AA	Match
Supplier Device Package	SOT-223	SOT-223	Match
Mounting Type	Through Hole	Surface Mount	Different
Product Status	Obsolete	Active	Different
RoHS Status	Non-compliant	Non-compliant	Match
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Match
ECCN	EAR99	EAR99	Match
HTSUS Code	8541.29.0095	8541.29.0095	Match

Engineering Selection Recommendations

For Direct Through-Hole Replacement:

No direct pin-compatible through-hole substitute is identified in the provided data. The IRLL1503TR, while electrically equivalent in voltage rating and FET technology, requires surface-mount PCB layout and cannot be used as a direct replacement without circuit board redesign.

For New Designs or PCB Redesign:

The IRLL1503TR (Vishay Siliconix) is electrically compatible with the IRLL1503 based on matching voltage rating (30V), FET type (N-Channel), and package designation (SOT-223). The IRLL1503TR maintains active product status, ensuring long-term availability and supply chain continuity compared to the obsolete IRLL1503.

Compliance Considerations:

Both the IRLL1503 and IRLL1503TR are RoHS non-compliant and REACH unaffected. Selection between these parts should account for regulatory requirements in the target application and end-market region.

Frequently Asked Questions (FAQ)

Q: Can the IRLL1503TR be used as a direct replacement for the IRLL1503 in existing PCBs?

A: No. Although both devices share the same base part number and package designation (SOT-223), the IRLL1503 is through-hole mounted while the IRLL1503TR is surface-mount. Direct substitution requires PCB redesign and different assembly processes.

Q: What are the key electrical parameters that determine substitution compatibility?

A: The critical parameters are: FET type (N-Channel), drain-to-source voltage rating (30V), continuous drain current capability (75A), on-resistance (3.3 mOhm), and gate threshold voltage (4V). Any substitute must meet or exceed these specifications.

Q: Why is the IRLL1503 classified as obsolete?

A: The IRLL1503 is listed as obsolete by Infineon Technologies. The IRLL1503TR from Vishay Siliconix maintains active status and represents the current-generation equivalent for new designs.

Q: Are there electrical parameter differences between the IRLL1503 and IRLL1503TR?

A: The provided data does not specify continuous drain current, on-resistance, gate threshold voltage, or gate charge for the IRLL1503TR. Verification against the Vishay datasheet is required to confirm electrical equivalence beyond voltage rating and FET type.

Q: What is the moisture sensitivity level for both devices?

A: Both the IRLL1503 and IRLL1503TR are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: Are both devices RoHS compliant?

A: No. Both the IRLL1503 and IRLL1503TR are RoHS non-compliant. Applications requiring RoHS compliance require alternative component selection.

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