ELJ-NC27NKF Equivalent & Substitute Parts

Part Overview

The ELJ-NC27NKF is a 27 nH unshielded wirewound inductor manufactured by Panasonic Electronic Components, rated for 230 mA maximum current with 470mOhm DC resistance. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. The part is housed in a 1008 (2520 Metric) surface mount package suitable for high-frequency applications up to 1.15 GHz self-resonant frequency.

Key Parameters

Parameter	Value
Inductance	27 nH
Tolerance	±10%
Current Rating	230 mA
DC Resistance (DCR)	470mOhm Max
Shielding	Unshielded
Package / Case	1008 (2520 Metric)
Mounting Type	Surface Mount
Operating Temperature	-20°C ~ 85°C
Frequency - Self Resonant	1.15 GHz

Substitute Part Grouping Explanation

Substitute parts for the ELJ-NC27NKF are qualified based on the following electrical and mechanical parameters:

Inductance value: 27 nH (exact match required)
Package / Case: 1008 (2520 Metric) (exact match required)
Mounting Type: Surface Mount (exact match required)
Shielding: Unshielded (exact match required)
Tolerance: ±10% or tighter acceptable
Current Rating: Equal to or greater than 230 mA
DC Resistance: Lower or equal to 470mOhm preferred for performance optimization
Operating Temperature Range: Must encompass or exceed -20°C ~ 85°C

Two substitute parts meet these criteria: CW252016-27NK (Bourns Inc.) and NLV25T-027J-PF (TDK Corporation).

Parameter Comparison

Parameter	ELJ-NC27NKF (Panasonic)	CW252016-27NK (Bourns)	NLV25T-027J-PF (TDK)
Inductance	27 nH	27 nH	27 nH
Tolerance	±10%	±10%	±5%
Current Rating (Amps)	230 mA	600 mA	410 mA
DC Resistance (DCR)	470mOhm Max	130mOhm Max	400mOhm Max
Shielding	Unshielded	Unshielded	Unshielded
Package / Case	1008 (2520 Metric)	1008 (2520 Metric)	1008 (2520 Metric)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Size / Dimension	0.098" L x 0.079" W (2.50mm x 2.00mm)	0.098" L x 0.079" W (2.50mm x 2.00mm)	0.098" L x 0.079" W (2.50mm x 2.00mm)
Height - Seated (Max)	0.071" (1.80mm)	0.071" (1.80mm)	0.075" (1.90mm)
Operating Temperature	-20°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 105°C
Frequency - Self Resonant	1.15 GHz	1.6 GHz	1.55 GHz
Product Status	Obsolete	Active	Not For New Designs
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

CW252016-27NK (Bourns Inc.) is the primary substitute for new designs. This part is in active production status, offers superior electrical performance with 130mOhm maximum DC resistance compared to the original 470mOhm specification, and provides 600 mA current rating capability exceeding the 230 mA requirement. The extended operating temperature range (-40°C ~ 125°C) and higher self-resonant frequency (1.6 GHz) provide additional design margin. RoHS3 compliance and REACH unaffected status confirm regulatory alignment for current manufacturing standards.

NLV25T-027J-PF (TDK Corporation) serves as a secondary substitute option. While this part carries a "Not For New Designs" status, it remains available with substantial inventory (25,400 pcs). The ±5% inductance tolerance provides tighter specification control than the original ±10%. DC resistance at 400mOhm and current rating of 410 mA both exceed the original part requirements. Height dimension (1.90mm seated) is marginally higher than the original (1.80mm), requiring PCB layout verification. RoHS3 compliance is confirmed; however, REACH affected status requires compliance documentation review for specific applications.

Frequently Asked Questions (FAQ)

Q: Can CW252016-27NK directly replace ELJ-NC27NKF without circuit modification?

A: Yes. Both parts share identical inductance (27 nH), package (1008 / 2520 Metric), mounting type (surface mount), and shielding (unshielded). The substitute offers improved electrical performance with lower DC resistance and higher current rating, making it functionally compatible without circuit redesign.

Q: What is the impact of lower DC resistance in CW252016-27NK?

A: Lower DC resistance (130mOhm vs. 470mOhm) reduces resistive losses in the inductor, resulting in improved Q factor and reduced heat generation. This is a performance enhancement for the application.

Q: Is the 0.10mm height difference between NLV25T-027J-PF and the original part significant?

A: The height difference (1.90mm vs. 1.80mm seated) is 0.10mm. Verify PCB clearance and component stacking requirements in your specific layout. This dimension should be confirmed against board design constraints before selection.

Q: Why is NLV25T-027J-PF marked "Not For New Designs"?

A: This designation indicates the manufacturer recommends against using this part in new product development. While the part remains available, CW252016-27NK is the preferred choice for new designs due to its active production status.

Q: Are there compliance differences between the substitute parts?

A: CW252016-27NK carries RoHS3 compliance with REACH unaffected status. NLV25T-027J-PF is RoHS3 compliant but REACH affected, requiring additional compliance documentation for certain applications. Verify regulatory requirements for your specific market and application.

Q: Can both substitute parts handle the original 230 mA current requirement?

A: Yes. CW252016-27NK is rated for 600 mA and NLV25T-027J-PF for 410 mA, both exceeding the 230 mA requirement of the original part.

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