LAL03NA3R3K Equivalent & Substitute Parts

Part Overview

The LAL03NA3R3K is a 3.3 µH unshielded axial inductor manufactured by Taiyo Yuden, rated for 210 mA maximum current with 1.4 Ohm maximum DC resistance. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and procurement needs. The part operates across a temperature range of -25°C to 105°C and is suitable for through-hole mounting applications.

Substiute Parts

LAL03NA3R3K

Taiyo YudenIn Stock: 1028LAL03NA3R3K Datasheet

Current PartRFQ

78F3R3J-RC

Bourns Inc.In Stock: 1304678F3R3J-RC Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 78F3R3J-RC from Bourns Inc. qualifies as a direct substitute for the LAL03NA3R3K based on the following critical parameters:

Matching Parameters:

• Inductance value: 3.3 µH (identical)
• Shielding configuration: Unshielded (identical)
• Mounting type: Through Hole (identical)
• Package type: Axial (identical)
• Inductance test frequency: 7.9 MHz (equivalent to 7.96 MHz)
• Q factor: 50 @ 7.9 MHz (equivalent performance)

Enhanced Specifications: The 78F3R3J-RC provides superior electrical performance in current handling capacity (575 mA versus 210 mA) and significantly lower DC resistance (300 mOhm versus 1.4 Ohm). The substitute part maintains the same inductance value and unshielded configuration while offering improved thermal performance through an extended lower operating temperature limit (-55°C versus -25°C). The substitute part is currently in active production status with ROHS3 compliance certification.

Parameter Comparison

Engineering Selection Recommendations

The 78F3R3J-RC is the appropriate substitute for the obsolete LAL03NA3R3K. Both components share identical inductance values, unshielded configuration, and axial through-hole mounting characteristics. The substitute part is currently in active production status, ensuring long-term availability and supply chain continuity.

The 78F3R3J-RC demonstrates superior electrical performance with lower DC resistance and higher current rating capacity, making it suitable for applications where the original LAL03NA3R3K was specified. Both parts maintain REACH Unaffected status and EAR99 export classification. The substitute part carries ROHS3 compliance certification, meeting current regulatory requirements.

The dimensional compatibility between the two parts (0.110" Dia x 0.280" L for the substitute versus 0.102" Dia x 0.276" L for the original) is within acceptable tolerances for standard through-hole PCB layouts. The inductance tolerance improvement (±5% versus ±10%) in the substitute part provides enhanced circuit performance predictability.

Frequently Asked Questions (FAQ)

Q: Can the 78F3R3J-RC directly replace the LAL03NA3R3K in existing circuit designs?

A: Yes. Both components share identical inductance values (3.3 µH), unshielded configuration, and axial through-hole mounting. The substitute part's superior electrical characteristics (lower DCR and higher current rating) make it functionally compatible with applications designed for the original part.

Q: What are the key differences between these two inductors?

A: The primary differences are current rating capacity (575 mA versus 210 mA), DC resistance (300 mOhm versus 1.4 Ohm), inductance tolerance (±5% versus ±10%), and product status (active versus obsolete). The substitute part also offers extended lower temperature operation (-55°C versus -25°C).

Q: Are there any dimensional compatibility concerns?

A: The substitute part dimensions (0.110" Dia x 0.280" L) are slightly larger than the original (0.102" Dia x 0.276" L). These differences are within standard PCB layout tolerances for axial through-hole components and do not present installation constraints.

Q: Does the 78F3R3J-RC meet current regulatory requirements?

A: Yes. The substitute part is ROHS3 compliant and maintains REACH Unaffected status, meeting current environmental and regulatory standards. Both components share identical ECCN (EAR99) export classification.

Q: What is the significance of the lower DC resistance in the substitute part?

A: The 78F3R3J-RC's 300 mOhm maximum DC resistance compared to the original 1.4 Ohm specification results in reduced power dissipation and improved thermal performance in the inductor. This characteristic is beneficial for applications requiring lower losses and extended operational reliability.

Q: Are the Q factor specifications equivalent between these parts?

A: Yes. Both components specify Q factor of 50 at approximately 7.9-7.96 MHz, indicating equivalent frequency response characteristics at the test frequency.