LAL03NA2R2M Equivalent & Substitute Parts

Part Overview

The LAL03NA2R2M is a 2.2 µH unshielded axial inductor manufactured by Taiyo Yuden, rated for 230 mA maximum current with 1.2 Ohm maximum DC resistance. This component is classified as obsolete, necessitating identification of active equivalent 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

LAL03NA2R2M

Taiyo YudenIn Stock: 994LAL03NA2R2M Datasheet

Current PartRFQ

78F2R2K-RC

Bourns Inc.In Stock: 701778F2R2K-RC Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LAL03NA2R2M is determined by matching the following critical electrical and mechanical parameters:

Inductance Value: Both the main part and substitute must maintain 2.2 µH inductance to ensure circuit functionality.

Mounting Configuration: Through-hole axial package format is required for mechanical compatibility with existing PCB layouts.

Current Rating: The substitute part must support the circuit's maximum current demand. The LAL03NA2R2M is rated for 230 mA; substitute parts with equal or higher current ratings are acceptable.

DC Resistance: Lower DC resistance values reduce power dissipation and heat generation. The main part specifies 1.2 Ohm maximum; substitutes with lower DCR values provide improved performance characteristics.

Shielding Type: Both parts are unshielded, maintaining electromagnetic compatibility with the original design.

Operating Temperature Range: The substitute must support the application's thermal environment. The main part operates from -25°C to 105°C.

Frequency Characteristics: Self-resonant frequency and Q-factor at test frequency must be comparable to maintain circuit performance at operating frequencies.

Parameter Comparison

Engineering Selection Recommendations

The 78F2R2K-RC manufactured by Bourns Inc. is an active substitute for the obsolete LAL03NA2R2M. Selection of this substitute is based on the following engineering criteria:

Electrical Equivalence: Both parts maintain identical 2.2 µH inductance values and equivalent frequency characteristics (Q-factor and self-resonant frequency). The substitute's ±10% tolerance provides improved inductance accuracy compared to the original ±20% tolerance.

Current Capacity: The 78F2R2K-RC is rated for 630 mA, exceeding the original 230 mA requirement. This provides additional design margin and thermal headroom in the application.

DC Resistance Performance: The substitute exhibits 250 mOhm maximum DC resistance, substantially lower than the original 1.2 Ohm specification. This reduction minimizes resistive losses and heat dissipation in the inductor.

Mechanical Compatibility: Both parts utilize through-hole axial packaging with comparable physical dimensions (0.110" diameter × 0.280" length versus 0.102" diameter × 0.276" length). Minor dimensional differences do not preclude direct PCB mounting compatibility.

Compliance and Availability: The 78F2R2K-RC is ROHS3 compliant and currently in active production with substantial inventory availability (6934 pieces in stock). The original LAL03NA2R2M is obsolete with limited remaining stock (968 pieces).

Temperature Range: The substitute supports operation from -55°C to 105°C, extending the low-temperature operating envelope beyond the original -25°C to 105°C specification.

Frequently Asked Questions (FAQ)

Q: Can the 78F2R2K-RC directly replace the LAL03NA2R2M in existing designs?

A: Yes. Both parts share identical inductance values (2.2 µH), unshielded configuration, through-hole axial mounting, and equivalent frequency characteristics. The substitute's superior current rating (630 mA versus 230 mA) and lower DC resistance (250 mOhm versus 1.2 Ohm) provide enhanced performance margins.

Q: What are the physical dimension differences between these parts?

A: The LAL03NA2R2M measures 0.102" diameter × 0.276" length (2.60mm × 7.00mm). The 78F2R2K-RC measures 0.110" diameter × 0.280" length (2.79mm × 7.11mm). These minor variations are within typical PCB layout tolerances for through-hole components and do not affect mounting compatibility.

Q: How do the DC resistance specifications compare?

A: The LAL03NA2R2M specifies 1.2 Ohm maximum DC resistance, while the 78F2R2K-RC specifies 250 mOhm maximum. The substitute's significantly lower resistance reduces power dissipation and improves efficiency in the application circuit.

Q: Are there temperature range considerations for substitution?

A: The original part operates from -25°C to 105°C. The substitute operates from -55°C to 105°C, providing extended low-temperature capability. If the application operates only within the original temperature range, both parts are functionally equivalent in this parameter.

Q: What is the inductance tolerance difference?

A: The LAL03NA2R2M carries ±20% inductance tolerance, while the 78F2R2K-RC carries ±10% tolerance. The substitute provides tighter inductance accuracy, which may improve circuit performance in applications sensitive to inductance variation.

Q: Why is the substitute rated for higher current (630 mA versus 230 mA)?

A: The 78F2R2K-RC uses a drum core wirewound construction with ferrite core material, enabling higher current handling capacity compared to the original design. This higher rating does not affect substitution compatibility; the part operates safely at the original 230 mA requirement with additional design margin.

Q: Is the substitute part currently available?

A: Yes. The 78F2R2K-RC is in active production status with 6934 pieces in current inventory. The original LAL03NA2R2M is obsolete with limited remaining stock.

Q: Are there compliance differences between the parts?

A: The 78F2R2K-RC is ROHS3 compliant. Both parts are REACH unaffected and carry EAR99 ECCN classification. The substitute meets current regulatory requirements for new designs and procurement.