ELJ-EA331KF Equivalent & Substitute Parts

Part Overview

The ELJ-EA331KF is a 330 µH shielded wirewound inductor manufactured by Panasonic Electronic Components, rated for 30 mA maximum current with 7.1Ohm DC resistance in a 1210 (3225 Metric) surface mount package. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain functional compatibility within the specified electrical and mechanical parameters.

Substiute Parts

ELJ-EA331KF

Panasonic Electronic ComponentsIn Stock: 1221ELJ-EA331KF Datasheet

Current PartRFQ

NLFV32T-331K-EF

TDK CorporationIn Stock: 17416NLFV32T-331K-EF Datasheet

DirectRFQ

SP1210R-334K

API Delevan Inc.In Stock: 688SP1210R-334K Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following mandatory parameters:

• Inductance value: 330 µH (exact match required)
• Tolerance: ±10% (exact match required)
• Package / Case: 1210 (3225 Metric) (exact match required)
• Shielding: Shielded (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Current Rating: Must equal or exceed 30 mA
• DC Resistance: Must not exceed 7.1Ohm Max
• Operating Temperature Range: Must encompass or exceed -20°C ~ 85°C

Two active substitute parts meet these criteria:

1. NLFV32T-331K-EF (TDK Corporation) – Current rating 35 mA, DCR 8.16Ohm Max
2. SP1210R-334K (API Delevan Inc.) – Current rating 88 mA, DCR 26.8Ohm Max

Parameter Comparison

Engineering Selection Recommendations

Both NLFV32T-331K-EF and SP1210R-334K are active products with ROHS3 compliance and REACH unaffected status, providing long-term supply assurance compared to the obsolete ELJ-EA331KF.

NLFV32T-331K-EF (TDK Corporation) provides the closest electrical match with 35 mA current rating and 8.16Ohm DCR, representing a minimal deviation from the original specification. This part maintains compatibility with the original operating temperature range and offers extended upper temperature capability to 105°C.

SP1210R-334K (API Delevan Inc.) offers significantly higher current capacity at 88 mA with extended operating temperature range to 125°C. However, the 26.8Ohm DCR represents a substantial increase from the original 7.1Ohm specification and may impact circuit performance in applications sensitive to inductor resistance.

Both substitutes maintain identical inductance, tolerance, shielding, and package footprint specifications. Dimensional variations are minimal and within typical PCB assembly tolerances.

Frequently Asked Questions (FAQ)

Q: Can NLFV32T-331K-EF directly replace ELJ-EA331KF in all applications?

A: NLFV32T-331K-EF meets all mandatory substitution criteria: identical inductance (330 µH), tolerance (±10%), package (1210), shielding, and mounting type. Current rating (35 mA) exceeds the original 30 mA requirement. The 8.16Ohm DCR is slightly elevated from 7.1Ohm; circuit performance impact depends on application sensitivity to inductor resistance.

Q: Why does SP1210R-334K have significantly higher DC resistance?

A: SP1210R-334K is specified for 88 mA current capacity, substantially exceeding the original 30 mA rating. Higher current capacity typically requires thicker wire gauge, resulting in increased DC resistance. This part is suitable only for applications where the higher DCR does not compromise circuit function.

Q: Are there PCB layout considerations when substituting these parts?

A: SP1210R-334K has maximum seated height of 0.101" (2.57mm) compared to 0.094" (2.40mm) for the original and NLFV32T-331K-EF. Verify clearance in confined spaces. Dimensional length and width variations are within standard PCB assembly tolerances.

Q: What is the impact of extended operating temperature ranges?

A: Both substitutes support extended temperature ranges beyond the original -20°C ~ 85°C specification. NLFV32T-331K-EF operates to 105°C; SP1210R-334K to 125°C. These extended ranges provide design margin but do not require circuit modification if the original temperature range is sufficient.

Q: Are both substitutes available in the same packaging format?

A: NLFV32T-331K-EF is supplied in Tape & Reel (TR) format. SP1210R-334K is also supplied in Tape & Reel (TR) format. Both are compatible with automated assembly processes.