LAL04KB101K Equivalent & Substitute Parts

Part Overview

The LAL04KB101K is a 100 µH unshielded inductor manufactured by Taiyo Yuden, rated for 275 mA continuous current with a maximum DC resistance of 1.8 Ohm. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The part operates across a temperature range of -25°C to 105°C and is suitable for through-hole mounting applications requiring axial package configuration.

Substiute Parts

LAL04KB101K

Taiyo YudenIn Stock: 1121LAL04KB101K Datasheet

Current PartRFQ

1641R-104K

API Delevan Inc.In Stock: 11341641R-104K Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the LAL04KB101K is based on the following critical parameters that must align across candidate parts:

Primary Matching Criteria:

• Inductance value: 100 µH (±10% tolerance)
• Inductance tolerance: ±10%
• Mounting type: Through Hole
• Package configuration: Axial

Secondary Compatibility Parameters:

• Current rating: Minimum 275 mA required
• DC resistance: Maximum 1.8 Ohm preferred
• Operating temperature range: Minimum -25°C to 105°C coverage
• Shielding configuration: Unshielded preferred for electromagnetic compatibility with original design

The substitute part 1641R-104K from API Delevan Inc. matches the primary inductance and package requirements. However, this substitute exhibits reduced current rating (164 mA versus 275 mA) and increased DC resistance (3.12 Ohm versus 1.8 Ohm), indicating application-dependent suitability.

Parameter Comparison

Engineering Selection Recommendations

The 1641R-104K from API Delevan Inc. serves as an active production alternative to the obsolete LAL04KB101K. Both components share identical inductance values, tolerances, and axial through-hole package configurations, establishing baseline functional equivalence.

Compliance and Availability Factors: The 1641R-104K maintains active product status with current manufacturing availability, whereas the LAL04KB101K is classified as obsolete. The substitute achieves ROHS3 compliance and maintains REACH unaffected status, consistent with the original part's regulatory standing.

Application-Specific Considerations: Selection between these components depends on circuit-level current requirements. The LAL04KB101K supports 275 mA continuous current, while the 1641R-104K is rated for 164 mA. Applications requiring the full 275 mA rating cannot substitute the 1641R-104K without thermal or performance degradation. The increased DC resistance of the 1641R-104K (3.12 Ohm versus 1.8 Ohm) results in higher power dissipation at equivalent current levels.

The shielding difference (unshielded original versus shielded substitute) affects electromagnetic coupling characteristics. Shielded inductors reduce radiated emissions and susceptibility to external fields, potentially altering circuit behavior in sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can the 1641R-104K directly replace the LAL04KB101K in all applications?

A: Direct replacement is limited by current rating. The 1641R-104K supports 164 mA maximum continuous current, compared to 275 mA for the LAL04KB101K. Applications operating at currents exceeding 164 mA require the original part or an alternative rated for higher current.

Q: What impact does the increased DC resistance have on circuit performance?

A: The 1641R-104K exhibits 3.12 Ohm maximum DC resistance versus 1.8 Ohm for the LAL04KB101K. At equivalent current levels, the higher resistance increases power dissipation (P = I²R), generating additional heat. This affects thermal management and may alter circuit efficiency.

Q: How does shielding affect substitution suitability?

A: The LAL04KB101K is unshielded, while the 1641R-104K is shielded. Shielded inductors confine magnetic fields, reducing electromagnetic interference with adjacent components. In designs sensitive to EMI or requiring specific coupling characteristics, shielding differences may necessitate circuit re-evaluation.

Q: Are both parts compliant with current regulatory standards?

A: The 1641R-104K is ROHS3 compliant and REACH unaffected. The LAL04KB101K regulatory status is not specified in available documentation. Both parts carry EAR99 ECCN classification and identical HTSUS codes.

Q: What is the physical size difference between these components?

A: The LAL04KB101K measures 0.157" diameter by 0.386" length (4.00mm x 9.80mm). The 1641R-104K measures 0.162" diameter by 0.410" length (4.11mm x 10.41mm). Both fit standard axial through-hole footprints with minimal dimensional variation.

Q: Which part should be selected for new designs?

A: The 1641R-104K is recommended for new designs due to active product status and current manufacturing availability. The LAL04KB101K is obsolete and procurement is limited to existing inventory. Application current requirements must not exceed 164 mA for the 1641R-104K.