ELJ-SA181KF Equivalent & Substitute Parts

Part Overview

The ELJ-SA181KF is a 180 µH shielded inductor manufactured by Panasonic Electronic Components, designed for surface mount applications in the 1210 (3225 Metric) package. This component is rated for 5 mA maximum current with 11Ohm maximum DC resistance and operates at a self-resonant frequency of 5 MHz. The part is currently obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Inductance	180 µH
Tolerance	±10%
Current Rating	5 mA
DC Resistance (DCR)	11Ohm Max
Shielding	Shielded
Package / Case	1210 (3225 Metric)
Mounting Type	Surface Mount
Inductance Test Frequency	100 kHz
Self-Resonant Frequency	5 MHz
Q @ Frequency	40 @ 1.5MHz

Substitute Part Grouping Explanation

Substitution of the ELJ-SA181KF is determined by the following critical parameters:

Inductance Value: 180 µH ±10% tolerance
Package Compatibility: 1210 (3225 Metric) surface mount form factor
Shielding Type: Shielded construction
Current Handling: Minimum 5 mA rating required
DC Resistance: Maximum 11Ohm specification
Mounting Configuration: Surface mount technology

The SP1210R-184K from API Delevan Inc. meets these substitution criteria. Both components share identical inductance values, package dimensions, shielding characteristics, and mounting methodology. The substitute part exceeds the current rating requirement (119 mA vs. 5 mA) and maintains DC resistance within acceptable parameters (14.7Ohm Max vs. 11Ohm Max), making it suitable for direct replacement in applications where the original part is no longer available.

Parameter Comparison

Parameter	ELJ-SA181KF (Panasonic)	SP1210R-184K (API Delevan)	Match Status
Inductance	180 µH	180 µH	Exact Match
Tolerance	±10%	±10%	Exact Match
Current Rating (Amps)	5 mA	119 mA	Substitute Exceeds
DC Resistance (DCR)	11Ohm Max	14.7Ohm Max	Substitute Within Tolerance
Shielding	Shielded	Shielded	Exact Match
Package / Case	1210 (3225 Metric)	1210 (3225 Metric)	Exact Match
Mounting Type	Surface Mount	Surface Mount	Exact Match
Inductance Test Frequency	100 kHz	100 kHz	Exact Match
Size / Dimension	0.126" L x 0.098" W (3.20mm x 2.50mm)	0.128" L x 0.095" W (3.25mm x 2.42mm)	Dimensionally Compatible
Height - Seated (Max)	0.094" (2.40mm)	0.101" (2.57mm)	Dimensionally Compatible
Product Status	Obsolete	Active	Substitute Available
RoHS Status	Not Specified	ROHS3 Compliant	Substitute Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Exact Match

Engineering Selection Recommendations

The SP1210R-184K is the appropriate substitute for the obsolete ELJ-SA181KF based on the following engineering criteria:

Product Status: The ELJ-SA181KF is obsolete, while the SP1210R-184K maintains active production status, ensuring long-term availability and supply chain continuity.

Compliance & Certifications: The SP1210R-184K is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component procurement. Both parts carry MSL 1 (Unlimited) moisture sensitivity ratings.

Electrical Compatibility: The substitute part maintains the same 180 µH inductance value and ±10% tolerance. The increased current rating (119 mA vs. 5 mA) and slightly elevated DC resistance (14.7Ohm Max vs. 11Ohm Max) do not compromise functionality in applications designed for the original 5 mA specification.

Physical Compatibility: Dimensional variations between the two parts (0.128" vs. 0.126" length; 0.101" vs. 0.094" height) remain within acceptable PCB layout tolerances for 1210 package footprints.

Frequently Asked Questions (FAQ)

Q: Can the SP1210R-184K directly replace the ELJ-SA181KF on existing PCBs?

A: Yes. Both components use identical 1210 (3225 Metric) surface mount packages with dimensionally compatible footprints. The substitute part fits standard ELJ-SA181KF land patterns without modification.

Q: Why does the SP1210R-184K have a higher current rating than the original part?

A: The substitute part uses drum core, wirewound construction with ferrite material, which provides higher current handling capability. This does not affect substitution suitability; the part operates safely at the original 5 mA specification.

Q: Is the increased DC resistance of the SP1210R-184K (14.7Ohm vs. 11Ohm) a concern?

A: The 3.7Ohm difference represents approximately 34% higher resistance. Circuit designers must evaluate power dissipation impact at the 5 mA operating current. At 5 mA, the original part dissipates 0.275 mW; the substitute dissipates 0.368 mW. This difference is typically negligible in low-current applications.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution is determined by inductance value (180 µH ±10%), package type (1210 surface mount), shielding configuration (shielded), current rating capability (minimum 5 mA), and DC resistance specification (maximum 11Ohm). The SP1210R-184K meets all these criteria.

Q: Are there compliance differences between the two parts?

A: The SP1210R-184K is ROHS3 compliant and REACH unaffected. The original ELJ-SA181KF compliance status is not specified in available documentation. For applications requiring specific regulatory compliance, the substitute part provides documented certification.

Q: What is the moisture sensitivity level for both parts?

A: Both the ELJ-SA181KF and SP1210R-184K carry MSL 1 (Unlimited) ratings, indicating no moisture sensitivity restrictions for storage or handling.

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