ELL-ATV120M Equivalent & Substitute Parts

Part Overview

The ELL-ATV120M is a 12 µH shielded drum core, wirewound inductor manufactured by Panasonic Electronic Components. Designed for surface mount applications, this component delivers 2.9 A current rating with 25mOhm DC resistance in a compact 10.00mm x 10.00mm footprint. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Inductance	12 µH
Current Rating	2.9 A
DC Resistance (DCR)	25mOhm
Tolerance	±20%
Core Type	Ferrite, Shielded Drum Core
Mounting Type	Surface Mount
Package Dimensions	10.00mm x 10.00mm x 4.50mm (max height)
Test Frequency	100 kHz
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the ELL-ATV120M is determined by the following critical parameters:

Primary Matching Criteria:

Inductance value: 12 µH (exact match required)
Core type: Ferrite, shielded drum core construction
Mounting type: Surface mount
Test frequency: 100 kHz

Secondary Compatibility Parameters:

Current rating: Substitute must equal or exceed 2.9 A
DC resistance: Substitute must not exceed 25mOhm significantly
Tolerance: ±20% or tighter acceptable
Package footprint: Nonstandard drum core geometry; physical dimensions must accommodate board layout constraints
RoHS and MSL compliance: ROHS3 Compliant and MSL 1 required

The SRR1050A-120Y from Bourns Inc. meets these substitution criteria with matching inductance, core type, mounting configuration, and compliance ratings, while providing enhanced current capacity and saturation specifications.

Parameter Comparison

Parameter	ELL-ATV120M (Panasonic)	SRR1050A-120Y (Bourns)	Compatibility
Inductance	12 µH	12 µH	Match
Current Rating (Amps)	2.9 A	3.8 A	Substitute exceeds requirement
DC Resistance (DCR)	25mOhm	35mOhm Max	Substitute within acceptable range
Tolerance	±20%	±30%	Original tighter; substitute acceptable
Core Type	Ferrite, Shielded Drum Core	Ferrite, Shielded Drum Core	Match
Shielding	Shielded	Shielded	Match
Mounting Type	Surface Mount	Surface Mount	Match
Package Dimensions (L x W)	10.00mm x 10.00mm	10.20mm x 10.00mm	Functionally equivalent footprint
Height - Seated (Max)	4.50mm	5.10mm	Substitute 0.60mm taller; verify clearance
Test Frequency	100 kHz	100 kHz	Match
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match
MSL Rating	1 (Unlimited)	1 (Unlimited)	Match
Product Status	Obsolete	Active	Substitute actively manufactured

Engineering Selection Recommendations

The SRR1050A-120Y is the qualified substitute for the obsolete ELL-ATV120M based on the following engineering criteria:

Compliance & Availability:

SRR1050A-120Y maintains ROHS3 compliance and MSL 1 rating, matching the original specification
Active product status ensures long-term availability and supply chain continuity
AEC-Q200 automotive qualification provides additional reliability assurance

Electrical Performance:

Identical 12 µH inductance at 100 kHz test frequency
Current rating of 3.8 A exceeds the original 2.9 A requirement, providing design margin
DC resistance of 35mOhm maximum is within acceptable tolerance relative to the 25mOhm original specification
Saturation current specification (4A) provides defined performance boundary

Physical Considerations:

Footprint dimensions (10.20mm x 10.00mm) are functionally equivalent to the original 10.00mm x 10.00mm
Maximum seated height of 5.10mm exceeds the original 4.50mm by 0.60mm; board layout clearance must be verified before implementation

Frequently Asked Questions (FAQ)

Q: Can the SRR1050A-120Y directly replace the ELL-ATV120M without circuit modification?

A: Yes, provided board layout accommodates the 0.60mm additional height. The electrical parameters—inductance, current rating, and DC resistance—are compatible with the original design intent. No circuit redesign is required.

Q: What is the significance of the higher DC resistance (35mOhm vs. 25mOhm) in the substitute?

A: The 10mOhm difference represents approximately 40% higher resistance. For applications where power dissipation or thermal performance is critical, calculate the impact using I²R losses at maximum operating current. In most general-purpose filtering and energy storage applications, this difference is negligible.

Q: Why does the substitute have a ±30% tolerance instead of ±20%?

A: Tolerance specifications reflect manufacturing process capabilities. The ±30% tolerance of the SRR1050A-120Y is acceptable for most circuit applications where the 12 µH inductance value is not the primary precision-dependent element. If tighter tolerance is mandatory, alternative substitutes should be evaluated.

Q: Is the additional saturation current specification (4A) on the SRR1050A-120Y relevant?

A: Yes. The saturation current defines the maximum current before inductance degrades significantly. The 4A saturation specification on the substitute provides a defined performance boundary above the 3.8 A continuous rating, offering design margin and predictable behavior under transient conditions.

Q: What packaging format is the SRR1050A-120Y supplied in?

A: The SRR1050A-120Y is supplied in Tape & Reel (TR) format, standard for high-volume surface mount assembly. Confirm your procurement and assembly process accommodates this packaging format.

Q: Are there any temperature or frequency limitations I should consider?

A: The SRR1050A-120Y operates across -40°C to 125°C, covering standard industrial and automotive temperature ranges. The 15MHz self-resonant frequency indicates stable performance well above the 100 kHz test frequency, suitable for typical switching power supply and filtering applications.

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