ELL-CTV390M Equivalent & Substitute Parts

Part Overview

The ELL-CTV390M is a 39 µH shielded drum core, wirewound inductor manufactured by Panasonic Electronic Components. Designed for surface mount applications, this component delivers 2.1 A current rating with 61 mOhm DC resistance in a compact 12.00mm × 12.00mm footprint. The part carries obsolete product status, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Inductance	39 µH
Inductance Tolerance	±20%
Current Rating	2.1 A
DC Resistance (DCR)	61 mOhm
Core Type	Ferrite, Shielded Drum Core
Mounting Type	Surface Mount
Package Dimensions	12.00mm L × 12.00mm W × 4.50mm H
Inductance Test Frequency	100 kHz
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the ELL-CTV390M is determined by the following critical parameters:

Inductance Value: Must match 39 µH at 100 kHz test frequency with ±20% tolerance
Current Rating: Substitute must support minimum 2.1 A continuous current
DC Resistance: Substitute DCR must not exceed design thermal and efficiency limits
Core Material & Shielding: Ferrite core with shielding required for EMI performance
Mounting Type: Surface mount configuration mandatory
Package Footprint: Physical dimensions must accommodate 12.00mm × 12.00mm board space
Compliance: RoHS3 and MSL Level 1 required for manufacturing compatibility

The SRR1260-390M from Bourns Inc. meets all substitution criteria within these parameters.

Parameter Comparison

Parameter	ELL-CTV390M (Panasonic)	SRR1260-390M (Bourns)	Compatibility
Inductance	39 µH	39 µH	Match
Inductance Tolerance	±20%	±20%	Match
Current Rating (Amps)	2.1 A	2.8 A	Compatible (higher rating)
DC Resistance (DCR)	61 mOhm	70 mOhm Max	Compatible (within tolerance)
Core Type	Ferrite, Shielded Drum Core	Ferrite, Shielded Drum Core	Match
Mounting Type	Surface Mount	Surface Mount	Match
Package Dimensions (L × W)	12.00mm × 12.00mm	12.50mm × 12.50mm	Compatible (minimal footprint increase)
Height - Seated (Max)	4.50mm	6.50mm	Compatible (height increase acceptable for most applications)
Inductance 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 is actively manufactured

Engineering Selection Recommendations

The SRR1260-390M qualifies as a direct functional substitute for the ELL-CTV390M based on the following engineering criteria:

Electrical Compatibility: Both components deliver 39 µH inductance at 100 kHz with identical ±20% tolerance. The SRR1260-390M provides 2.8 A current rating, exceeding the ELL-CTV390M requirement of 2.1 A, ensuring adequate margin for circuit operation. DC resistance of 70 mOhm maximum remains within acceptable design parameters relative to the original 61 mOhm specification.

Physical Compatibility: Surface mount configuration and ferrite shielded drum core construction are identical. Package footprint increases from 12.00mm to 12.50mm and height from 4.50mm to 6.50mm represent minor dimensional changes suitable for most PCB layouts. Board-level verification is required only if space constraints are critical.

Compliance & Availability: Both components maintain ROHS3 compliance and MSL Level 1 rating. The SRR1260-390M carries active product status with established supply chain availability, eliminating obsolescence risk associated with the ELL-CTV390M.

Frequently Asked Questions (FAQ)

Q: Can the SRR1260-390M directly replace the ELL-CTV390M without circuit modification?

A: Yes. Both inductors deliver identical 39 µH inductance at 100 kHz with matching ±20% tolerance and ferrite shielded core construction. The higher current rating and marginally increased DC resistance of the substitute do not require circuit redesign for standard applications.

Q: What is the significance of the 0.5mm footprint increase (12.00mm to 12.50mm)?

A: The dimensional increase is minimal and accommodates standard PCB routing practices. Verification against specific board layout constraints is necessary only in space-restricted designs. Height increase from 4.50mm to 6.50mm should be confirmed against component clearance requirements.

Q: Why is the SRR1260-390M recommended despite higher DC resistance (70 mOhm vs. 61 mOhm)?

A: The 9 mOhm difference represents approximately 15% increase in resistance. For most inductor applications, this variance remains within acceptable thermal and efficiency margins. Circuit-specific thermal analysis is recommended only for high-current or thermally constrained designs.

Q: Are there packaging differences between these components?

A: The ELL-CTV390M is supplied in standard packaging, while the SRR1260-390M is available in Tape & Reel (TR) format. Both maintain MSL Level 1 rating. Tape & Reel packaging is standard for automated assembly processes and does not affect component performance.

Q: What compliance certifications apply to both parts?

A: Both the ELL-CTV390M and SRR1260-390M are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity rating. Both are classified under ECCN EAR99 for export purposes.

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