ELL-4FG470MA Equivalent & Substitute Parts

Part Overview

The ELL-4FG470MA is a 47 µH shielded wirewound inductor manufactured by Panasonic Electronic Components, rated for 330 mA continuous current with 1.6 Ohm DC resistance. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing production and maintenance applications. The part is packaged in a nonstandard surface mount configuration with RoHS3 compliance and unlimited moisture sensitivity rating.

Key Parameters

Parameter	Value
Inductance	47 µH
Tolerance	±20%
Current Rating	330 mA
Saturation Current (Isat)	290 mA
DC Resistance (DCR)	1.6 Ohm
Shielding	Shielded
Mounting Type	Surface Mount
Package Size	3.80mm x 3.80mm x 1.20mm (Max Height)
Test Frequency	100 kHz
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the ELL-4FG470MA is determined by the following critical parameters:

Inductance Value: Must be 47 µH with ±20% tolerance
Current Rating: Minimum 330 mA continuous current capability
Saturation Current: Must support at least 290 mA without saturation effects
DC Resistance: Lower DCR values improve efficiency; maximum acceptable DCR depends on circuit requirements
Shielding: Shielded configuration required to maintain electromagnetic isolation
Mounting Type: Surface mount configuration mandatory
Package Footprint: Physical dimensions must accommodate 3.80mm x 3.80mm footprint or compatible alternative
Compliance: RoHS3 compliance required for regulatory alignment

The substitute part NR4018T470M meets these criteria with improved electrical characteristics, including higher current rating (420 mA), lower DC resistance (780 mOhm), and higher saturation current (570 mA).

Parameter Comparison

Parameter	ELL-4FG470MA (Panasonic)	NR4018T470M (Taiyo Yuden)
Inductance	47 µH	47 µH
Tolerance	±20%	±20%
Current Rating (Amps)	330 mA	420 mA
Saturation Current (Isat)	290 mA	570 mA
DC Resistance (DCR)	1.6 Ohm	780 mOhm Max
Shielding	Shielded	Shielded
Mounting Type	Surface Mount	Surface Mount
Package Size (L x W)	3.80mm x 3.80mm	4.00mm x 4.00mm
Height (Max)	1.20mm	1.80mm
Test Frequency	100 kHz	100 kHz
Self Resonant Frequency	Not specified	10 MHz
Operating Temperature Range	Not specified	-25°C ~ 120°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Not For New Designs

Engineering Selection Recommendations

The NR4018T470M from Taiyo Yuden serves as a direct functional substitute for the obsolete ELL-4FG470MA. Both components maintain identical inductance values and tolerance specifications at the 100 kHz test frequency. The substitute part provides superior electrical performance with 27% higher current rating (420 mA vs. 330 mA) and significantly lower DC resistance (780 mOhm vs. 1.6 Ohm), resulting in reduced power dissipation and improved thermal characteristics.

Physical footprint differences exist: the NR4018T470M measures 4.00mm x 4.00mm with 1.80mm maximum height compared to the 3.80mm x 3.80mm x 1.20mm maximum height of the original part. PCB layout modifications may be required to accommodate the larger footprint and increased height.

Both parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). The substitute part is classified as "Not For New Designs," indicating limited long-term availability. For new designs, consultation with component suppliers for current-generation alternatives is recommended.

Frequently Asked Questions (FAQ)

Q: Can the NR4018T470M directly replace the ELL-4FG470MA without circuit modifications?

A: Electrical substitution is valid based on matching inductance, tolerance, and shielding specifications. Physical PCB layout modifications are necessary due to footprint size differences (4.00mm vs. 3.80mm) and increased height (1.80mm vs. 1.20mm maximum).

Q: What is the significance of the lower DC resistance in the substitute part?

A: The NR4018T470M exhibits 780 mOhm maximum DC resistance compared to 1.6 Ohm in the original part. Lower DCR reduces resistive losses and heat generation during operation, improving overall circuit efficiency and component reliability.

Q: Are both parts suitable for new product designs?

A: Neither part is recommended for new designs. The ELL-4FG470MA is obsolete, and the NR4018T470M is classified as "Not For New Designs." Current-generation inductors with equivalent specifications should be evaluated for new applications.

Q: What are the implications of the higher saturation current in the substitute?

A: The NR4018T470M provides 570 mA saturation current versus 290 mA in the original part. This higher saturation margin provides greater headroom before inductance degradation occurs, allowing operation at higher current levels without performance compromise.

Q: How do the package size differences affect PCB design?

A: The substitute part requires a larger footprint (4.00mm x 4.00mm vs. 3.80mm x 3.80mm) and greater height clearance (1.80mm vs. 1.20mm maximum). Component placement and routing must be adjusted accordingly. Verify clearance with adjacent components and mechanical constraints.

Q: Are there compliance differences between the two parts?

A: Both parts maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating. No compliance disadvantages exist for the substitute part in this regard.

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