ELC-09D121DF Equivalent & Substitute Parts

Part Overview

The ELC-09D121DF is a 120 µH unshielded wirewound inductor manufactured by Panasonic Electronic Components, rated for 770 mA with a DC resistance of 250mOhm. This through-hole radial component is designed for general-purpose filtering and energy storage applications in electronic circuits.

The ELC-09D121DF is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this inductor.

Substiute Parts

ELC-09D121DF

Panasonic Electronic ComponentsIn Stock: 836ELC-09D121DF Datasheet

Current PartRFQ

RL622-121K-RC

Bourns Inc.In Stock: 1681RL622-121K-RC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ELC-09D121DF is determined by the following critical parameters:

• Inductance Value: Must be 120 µH with ±10% tolerance
• Current Rating: Substitute must support minimum 770 mA continuous current
• DC Resistance: Substitute DCR must not exceed 250mOhm to maintain circuit performance
• Mounting Type: Through-hole radial configuration required
• Package Compatibility: Radial, vertical cylinder form factor
• Regulatory Compliance: ROHS3 compliance required

The RL622-121K-RC from Bourns Inc. meets these substitution criteria. It provides the same inductance value, supports higher current (840 mA), maintains comparable DC resistance (320mOhm max), and shares the same through-hole radial mounting configuration.

Parameter Comparison

Engineering Selection Recommendations

The RL622-121K-RC is suitable as a substitute for the ELC-09D121DF based on the following factors:

• Both components are ROHS3 compliant, meeting regulatory requirements
• The RL622-121K-RC is an active product with confirmed supply availability, addressing the obsolescence of the original part
• Electrical parameters align within acceptable tolerances: identical inductance and tolerance, higher current rating, and comparable DC resistance
• Through-hole radial mounting configuration is preserved, supporting direct board-level replacement
• Physical dimensions differ slightly; PCB layout verification is required to confirm fit within the available mounting space

Frequently Asked Questions (FAQ)

Q: Can the RL622-121K-RC be used as a direct replacement for the ELC-09D121DF?

A: Yes, the RL622-121K-RC meets the core electrical and mechanical substitution criteria. However, physical dimensions differ: the RL622-121K-RC is slightly smaller in diameter (0.335" vs 0.374") but taller (0.433" vs 0.350"). PCB layout must be verified to confirm adequate clearance.

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

A: The primary differences are product status (obsolete vs. active), current rating (770 mA vs. 840 mA), DC resistance (250mOhm vs. 320mOhm max), and physical dimensions. Inductance, tolerance, and mounting type are identical.

Q: Does the higher DC resistance of the RL622-121K-RC affect circuit performance?

A: The RL622-121K-RC has a maximum DC resistance of 320mOhm compared to 250mOhm for the ELC-09D121DF. This 28% increase in resistance will result in proportionally higher power dissipation. Circuit analysis is required to determine if this is acceptable for the specific application.

Q: Are there any compliance or certification differences?

A: Both components are ROHS3 compliant. The RL622-121K-RC includes REACH Unaffected status, providing additional regulatory documentation.

Q: What should be considered when selecting between these parts?

A: Selection should be based on supply availability, PCB layout constraints, acceptable power dissipation limits, and current requirements. The RL622-121K-RC offers higher current capacity and active product status, making it suitable for new designs and ongoing production support.