ELJ-FBR22MF Equivalent & Substitute Parts

Part Overview

The ELJ-FBR22MF is a 220 nH unshielded wirewound inductor manufactured by Panasonic Electronic Components, rated for 700 mA continuous current with a maximum DC resistance of 300mOhm. The component is packaged in 1812 (4532 Metric) surface mount format with ±20% inductance tolerance and operates across -20°C to 85°C. This part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs or production transitions.

Key Parameters

Parameter	Value
Inductance	220 nH
Inductance Tolerance	±20%
Current Rating	700 mA
DC Resistance (DCR)	300mOhm Max
Package / Case	1812 (4532 Metric)
Mounting Type	Surface Mount
Shielding	Unshielded
Operating Temperature	-20°C ~ 85°C
Type	Wirewound

Substitute Part Grouping Explanation

Substitution eligibility for the ELJ-FBR22MF is determined by the following critical parameters:

Primary Matching Criteria:

Inductance value: 220 nH with ±20% tolerance
Package / Case: 1812 (4532 Metric) surface mount
Mounting Type: Surface Mount
Physical dimensions: 0.177" L x 0.126" W (4.50mm x 3.20mm), Height 0.134" max (3.40mm)

Secondary Compatibility Parameters:

Current Rating: Minimum 700 mA (substitute parts may exceed this rating)
DC Resistance: Maximum 300mOhm (substitute parts may have lower DCR)
Shielding configuration: Unshielded preferred; shielded variants acceptable if electrical performance permits
Operating Temperature: Minimum -20°C to 85°C range (substitute parts may have extended ranges)

All identified substitute parts meet the primary matching criteria. Variations in current rating, DCR, and temperature range reflect different core materials and construction methods while maintaining functional equivalence for the 220 nH inductance specification.

Parameter Comparison

Part Number	Manufacturer	Inductance	Tolerance	Current Rating (mA)	DCR (mOhm Max)	Shielding	Type	Operating Temp	Product Status
ELJ-FBR22MF	Panasonic	220 nH	±20%	700	300	Unshielded	Wirewound	-20°C ~ 85°C	Obsolete
CM453232-R22ML	Bourns Inc.	220 nH	±20%	665	250	Unshielded	Drum Core, Wirewound	-40°C ~ 125°C	Active
IMC1812BNR22M	Vishay Dale	220 nH	±20%	450	400	Unshielded	Wirewound	-55°C ~ 125°C	Active
IMC1812EBR22M	Vishay Dale	220 nH	±20%	450	400	Unshielded	Wirewound	-55°C ~ 125°C	Active
IMC1812ERR22M	Vishay Dale	220 nH	±20%	450	400	Unshielded	Wirewound	-55°C ~ 125°C	Active
IMC1812ESR22M	Vishay Dale	220 nH	±20%	450	400	Unshielded	Wirewound	-55°C ~ 125°C	Active
IMC1812RQR22M	Vishay Dale	220 nH	±20%	450	400	Unshielded	Wirewound	-55°C ~ 125°C	Active
IMC1812RVR22M	Vishay Dale	220 nH	±20%	450	400	Unshielded	Wirewound	-55°C ~ 125°C	Active
S1812R-221K	API Delevan Inc.	220 nH	±10%	1154	150	Shielded	-	-55°C ~ 125°C	Active

Engineering Selection Recommendations

CM453232-R22ML (Bourns Inc.) is the primary active substitute. This component maintains unshielded construction matching the original design intent, offers improved DC resistance (250mOhm vs. 300mOhm), and provides extended operating temperature range (-40°C to 125°C). Product status is active with ROHS3 compliance and REACH unaffected designation.

IMC1812 Series (Vishay Dale) comprises multiple packaging variants (IMC1812BNR22M, IMC1812EBR22M, IMC1812ERR22M, IMC1812ESR22M, IMC1812RQR22M, IMC1812RVR22M) with identical electrical specifications. These components feature non-magnetic core construction, extended temperature range (-55°C to 125°C), and higher self-resonant frequency (350MHz). Current rating is 450 mA, which is below the original 700 mA specification. RoHS compliance varies by variant: IMC1812EBR22M, IMC1812ERR22M, IMC1812ESR22M are ROHS3 compliant; IMC1812BNR22M, IMC1812RQR22M, IMC1812RVR22M are non-compliant.

S1812R-221K (API Delevan Inc.) provides shielded construction with superior current rating (1.154 A) and lowest DC resistance (150mOhm). Shielding configuration differs from the original unshielded design and should be evaluated for electromagnetic compatibility in the target application. Inductance tolerance is tighter (±10% vs. ±20%). Product status is active with ROHS3 compliance and REACH unaffected designation.

Frequently Asked Questions (FAQ)

Q: Can IMC1812 series parts substitute for ELJ-FBR22MF in high-current applications?

A: IMC1812 series components are rated for 450 mA continuous current, which is below the original 700 mA specification. Application of these parts requires circuit analysis to confirm current levels remain within the 450 mA limit. If the design requires 700 mA operation, CM453232-R22ML (665 mA) or S1812R-221K (1.154 A) are appropriate selections.

Q: What is the difference between shielded and unshielded inductors?

A: The original ELJ-FBR22MF is unshielded. S1812R-221K is shielded, which reduces electromagnetic radiation but may alter circuit performance in sensitive applications. Shielded construction is suitable when EMI mitigation is required; unshielded construction is preferred for standard RF and analog circuits where shielding is not necessary.

Q: Are all IMC1812 variants electrically equivalent?

A: Yes. IMC1812BNR22M, IMC1812EBR22M, IMC1812ERR22M, IMC1812ESR22M, IMC1812RQR22M, and IMC1812RVR22M share identical electrical specifications (220 nH, 450 mA, 400mOhm DCR). Differences are packaging format (bulk vs. tape & reel) and RoHS compliance status. Selection depends on procurement requirements and regulatory compliance mandates.

Q: Does inductance tolerance affect circuit performance?

A: The original part specifies ±20% tolerance. S1812R-221K offers ±10% tolerance, providing tighter inductance control. All other substitutes maintain ±20% tolerance. Tighter tolerance may improve circuit stability in precision applications but is not required for standard substitution.

Q: What is the impact of DC resistance differences?

A: Lower DC resistance reduces power dissipation and heat generation. CM453232-R22ML (250mOhm) and S1812R-221K (150mOhm) dissipate less power than the original 300mOhm specification. IMC1812 series (400mOhm) dissipates more power. For applications with current near the component rating, higher DCR may require thermal analysis.

Q: Can I use S1812R-221K in place of ELJ-FBR22MF without circuit modification?

A: S1812R-221K is mechanically and electrically compatible in terms of inductance value and package size. However, shielded construction may affect circuit behavior in sensitive RF or analog applications. Circuit validation is necessary to confirm performance equivalence, particularly in high-frequency or low-noise designs.

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