ELJ-SA270KF Equivalent & Substitute Parts

Part Overview

The ELJ-SA270KF is a 27 µH shielded surface mount inductor manufactured by Panasonic Electronic Components, rated for 10 mA maximum current with 3.2Ω maximum DC resistance in a 1210 (3225 Metric) package. This part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. Substitute parts must maintain the same inductance value, package form factor, and shielding characteristics while accommodating variations in current rating and DC resistance within acceptable design margins.

Substiute Parts

ELJ-SA270KF

Panasonic Electronic ComponentsIn Stock: 727ELJ-SA270KF Datasheet

Current PartRFQ

S1210-273K

API Delevan Inc.In Stock: 947S1210-273K Datasheet

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S1210R-273K

API Delevan Inc.In Stock: 728S1210R-273K Datasheet

SimilarRFQ

SP1210R-273K

API Delevan Inc.In Stock: 1045SP1210R-273K Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ELJ-SA270KF are qualified based on the following criteria:

Primary Matching Parameters:

• Inductance value: 27 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)

Secondary Compatibility Parameters:

• Current Rating: Substitute parts must equal or exceed the 10 mA requirement
• DC Resistance: Substitute parts with higher DCR values are acceptable if circuit design permits
• Moisture Sensitivity Level: MSL 1 (Unlimited) maintained across all substitutes

All three substitute parts (S1210-273K, S1210R-273K, SP1210R-273K) from API Delevan Inc. meet these primary matching criteria. Differences in current rating and DC resistance reflect design variations that do not preclude substitution in applications where the ELJ-SA270KF operates below its maximum current specification.

Parameter Comparison

Engineering Selection Recommendations

S1210R-273K (Recommended Primary Substitute)

The S1210R-273K is the preferred substitute for the obsolete ELJ-SA270KF. This part maintains identical inductance, tolerance, and package specifications while providing superior current handling (201 mA vs. 10 mA) and ROHS3 compliance. The 4Ω maximum DCR represents a 0.8Ω increase from the original specification, which is acceptable in most circuit applications where the ELJ-SA270KF operates at or below its 10 mA rating. Active product status ensures long-term availability and supply chain stability.

SP1210R-273K (Alternative for Low-Resistance Applications)

The SP1210R-273K offers the lowest DC resistance (2.5Ω Max) among available substitutes, making it suitable for applications where minimizing resistive losses is critical. This drum core, wirewound inductor provides the highest current rating (291 mA) and maintains ROHS3 compliance. Selection of this part is appropriate when circuit design specifically benefits from reduced DCR or higher current capacity.

S1210-273K (Legacy Compatibility)

The S1210-273K is electrically equivalent to S1210R-273K but carries RoHS non-compliant status. This part should be selected only when legacy design requirements or specific procurement constraints mandate non-compliant components. Active product status provides availability, but ROHS3-compliant alternatives are preferred for new designs.

Frequently Asked Questions (FAQ)

Q: Can S1210-273K, S1210R-273K, or SP1210R-273K be used as direct replacements for ELJ-SA270KF?

A: Yes. All three substitute parts maintain the same 27 µH inductance value, ±10% tolerance, 1210 (3225 Metric) package, and shielded configuration. The higher current ratings and variations in DC resistance do not prevent substitution in circuits where the ELJ-SA270KF operates within its 10 mA specification.

Q: What is the significance of the DC resistance difference between ELJ-SA270KF (3.2Ω) and the substitutes (4Ω or 2.5Ω)?

A: DC resistance affects power dissipation and voltage drop across the inductor. The 0.8Ω increase in S1210-273K and S1210R-273K is typically negligible in low-current applications. SP1210R-273K's 2.5Ω maximum DCR provides lower losses and is preferable when power efficiency is a design consideration.

Q: Why is S1210R-273K recommended over S1210-273K?

A: S1210R-273K is ROHS3 compliant, whereas S1210-273K is RoHS non-compliant. For new designs and applications subject to environmental regulations, ROHS3 compliance is the standard requirement. Both parts are electrically identical.

Q: Are there dimensional compatibility concerns with the substitute parts?

A: Substitute parts have slightly larger maximum dimensions (0.128" L x 0.095" W vs. 0.126" L x 0.098" W) and greater seated height (0.101" vs. 0.094"). These differences are within typical PCB layout tolerances for 1210 package components. Verify PCB footprint clearances before final design release.

Q: What is the difference between S1210-273K and SP1210R-273K construction?

A: S1210-273K uses standard ferrite core construction, while SP1210R-273K employs drum core, wirewound construction. The wirewound design in SP1210R-273K contributes to its lower DC resistance (2.5Ω vs. 4Ω) and higher current saturation point (249 mA).

Q: Are all substitute parts available in Tape & Reel (TR) packaging?

A: Yes. S1210-273K, S1210R-273K, and SP1210R-273K are all supplied in Tape & Reel packaging, suitable for automated assembly processes.