ELJ-FA101JFD 100µH SMD Inductor Equivalent & Substitute Parts

Part Overview

The Panasonic ELJ-FA101JFD is a 100µH unshielded wirewound inductor rated for 70mA with 14Ohm maximum DC resistance in a 1210 (3225 Metric) surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substitute parts are selected based on matching core electrical parameters: 100µH inductance at ±5% tolerance, surface mount 1210 package compatibility, and operating temperature ranges suitable for the application. Current rating, DC resistance, and shielding characteristics are secondary selection criteria that may vary within acceptable limits depending on circuit requirements.

Key Parameters

Parameter	Value
Inductance	100 µH
Tolerance	±5%
Current Rating	70 mA
DC Resistance (DCR)	14 Ohm Max
Shielding	Unshielded
Package / Case	1210 (3225 Metric)
Mounting Type	Surface Mount
Operating Temperature	-20°C ~ 85°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution logic is based on the following mandatory parameters:

Inductance Value: All substitute parts must be 100µH ±5% tolerance
Package Format: All parts must be 1210 (3225 Metric) surface mount compatible
Electrical Performance: Current rating and DC resistance must meet or exceed the original specification for direct substitution

Substitute parts are categorized as follows:

Direct Substitutes (higher current rating, lower or equal DCR):

1210R-104J (API Delevan Inc.) – 120mA rating, 13Ohm DCR, ferrite core, active status
CM322522-101JL (Bourns Inc.) – 60mA rating, 10Ohm DCR, drum core wirewound, active status

Similar Substitutes (shielded variants, equivalent current handling):

ISC1210ER101J (Vishay Dale) – 80mA rating, 12Ohm DCR, shielded drum core, tape & reel packaging
ISC1210EB101J (Vishay Dale) – 80mA rating, 12Ohm DCR, shielded drum core, bulk packaging

Parameter Comparison

Part Number	Manufacturer	Inductance	Tolerance	Current Rating (mA)	DCR (Ohm Max)	Shielding	Core Type	Operating Temp	Product Status
ELJ-FA101JFD	Panasonic	100 µH	±5%	70	14	Unshielded	Wirewound	-20°C ~ 85°C	Obsolete
1210R-104J	API Delevan Inc.	100 µH	±5%	120	13	Unshielded	Ferrite	-55°C ~ 125°C	Active
CM322522-101JL	Bourns Inc.	100 µH	±5%	60	10	Unshielded	Drum Core, Wirewound	-40°C ~ 125°C	Active
ISC1210ER101J	Vishay Dale	100 µH	±5%	80	12	Shielded	Drum Core, Wirewound	-55°C ~ 125°C	Active
ISC1210EB101J	Vishay Dale	100 µH	±5%	80	12	Shielded	Drum Core, Wirewound	-55°C ~ 125°C	Active

Engineering Selection Recommendations

For Direct Replacement (Unshielded, Active Status):

1210R-104J is the primary direct substitute. It provides higher current capacity (120mA vs. 70mA), lower DC resistance (13Ohm vs. 14Ohm), and extended operating temperature range (-55°C ~ 125°C). Active product status ensures long-term availability and supply chain stability.

CM322522-101JL offers the lowest DC resistance (10Ohm) and maintains wirewound construction matching the original design. Current rating is 60mA, which is below the original specification and requires circuit validation. Active status and ROHS3 compliance are confirmed.

For Shielded Applications:

ISC1210ER101J and ISC1210EB101J are functionally identical shielded variants with 80mA current rating and 12Ohm DCR. ISC1210ER101J is supplied in tape & reel format; ISC1210EB101J is supplied in bulk. Both are active products with ROHS3 compliance and extended temperature range. Shielding introduces electromagnetic isolation suitable for noise-sensitive circuits.

Compliance Considerations:

All active substitute parts carry ROHS3 compliance and REACH unaffected status, meeting modern regulatory requirements. The original ELJ-FA101JFD carries MSL 1 (Unlimited) moisture sensitivity, consistent with all substitutes.

Frequently Asked Questions (FAQ)

Q: Can 1210R-104J replace ELJ-FA101JFD in all applications?

A: 1210R-104J meets or exceeds all electrical parameters of the original part. The higher current rating (120mA vs. 70mA) and lower DCR (13Ohm vs. 14Ohm) make it suitable for direct replacement. Verify circuit operating conditions do not depend on the original part's specific frequency response characteristics.

Q: What is the difference between ISC1210ER101J and ISC1210EB101J?

A: Both parts are electrically identical 100µH shielded inductors with 80mA rating and 12Ohm DCR. The difference is packaging: ISC1210ER101J is supplied in tape & reel format for automated assembly; ISC1210EB101J is supplied in bulk. Select based on assembly process requirements.

Q: Why does CM322522-101JL have lower current rating than the original?

A: CM322522-101JL is rated for 60mA, below the original 70mA specification. This part is suitable only if circuit operating current does not exceed 60mA. Verify actual circuit current draw before selection.

Q: Are shielded variants (ISC1210 series) compatible with unshielded circuit designs?

A: Shielded inductors provide electromagnetic isolation and are physically compatible with 1210 package footprints. Shielding may alter circuit impedance characteristics and frequency response. Validate performance in the target application before production use.

Q: What is the significance of the ferrite core in 1210R-104J versus wirewound cores?

A: Core material affects frequency response, Q factor, and saturation characteristics. 1210R-104J uses ferrite core with Q of 30 @ 2.5MHz; the original uses wirewound with Q of 20 @ 796kHz. Core type selection depends on circuit frequency requirements and performance specifications.

Q: Are all substitute parts available in the same package dimensions?

A: All parts conform to 1210 (3225 Metric) package specification. Physical dimensions vary slightly: height ranges from 2.40mm to 2.57mm. Verify PCB assembly clearance for height-sensitive applications.

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