DC1390-394K Fixed Inductor Equivalent & Substitute Parts

Part Overview

The DC1390-394K is a 390 µH fixed unshielded inductor manufactured by API Delevan Inc., rated for 5.39 A continuous current with a maximum DC resistance of 82 mOhm. The component features a ferrite core, through-hole radial vertical cylinder mounting, and operates across a wide temperature range of -55°C to 125°C. This product maintains Active status in the manufacturer's portfolio. Identifying equivalent and substitute parts is essential when the primary component becomes unavailable, when procurement requirements necessitate alternative suppliers, or when design specifications allow flexibility within the established electrical and mechanical parameters.

Key Parameters

Parameter	Value
Inductance	390 µH
Inductance Tolerance	±10%
Current Rating	5.39 A
Saturation Current (Isat)	6.8 A
DC Resistance (Max)	82 mOhm
Core Material	Ferrite
Shielding	Unshielded
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Through Hole
Package Type	Radial, Vertical Cylinder
Size (Diameter)	1.480" (37.60 mm)
Height (Max)	1.064" (27.03 mm)
Inductance Test Frequency	1 kHz

Substitute Part Grouping Explanation

Substitution of the DC1390-394K inductor is permissible based on strict electrical and mechanical equivalence within the following parameters:

Primary Electrical Criteria:

Inductance value: 390 µH with ±10% tolerance
Current rating minimum: 5.39 A (substitutes must maintain or exceed this rating)
DC resistance maximum: 82 mOhm (critical for power dissipation and thermal characteristics)
Core material: Ferrite
Shielding classification: Unshielded

Mechanical and Operational Criteria:

Mounting type: Through Hole
Package classification: Radial configuration
Operating temperature compatibility: Minimum -55°C to 125°C range (or subset that includes design operating point)
Inductance measurement frequency: 1 kHz

The Bourns Inc. 1140-391K-RC satisfies these substitution criteria, providing equivalent inductance, ferrite core construction, unshielded configuration, and through-hole radial mounting. The substitute component exhibits enhanced current capacity and saturation characteristics while maintaining identical DC resistance and inductance specifications.

Parameter Comparison

Parameter	DC1390-394K (API Delevan)	1140-391K-RC (Bourns Inc.)	Match Status
Inductance	390 µH	390 µH	Exact Match
Inductance Tolerance	±10%	±10%	Exact Match
Current Rating (Amps)	5.39 A	5.8 A	Substitute Exceeds
Saturation Current (Isat)	6.8 A	10.4 A	Substitute Exceeds
DC Resistance (Max)	82 mOhm	82 mOhm	Exact Match
Core Material	Ferrite	Ferrite	Exact Match
Shielding	Unshielded	Unshielded	Exact Match
Mounting Type	Through Hole	Through Hole	Exact Match
Package Type	Radial, Vertical Cylinder	Radial	Compatible
Operating Temperature Range	-55°C ~ 125°C	-55°C ~ 105°C	Substitute Subset
Size (Diameter)	1.480" (37.60 mm)	1.500" (38.10 mm)	Minimal Variance
Height (Max)	1.064" (27.03 mm)	1.030" (26.16 mm)	Compatible Dimensions
Inductance Test Frequency	1 kHz	1 kHz	Exact Match

Engineering Selection Recommendations

DC1390-394K Suitability: The DC1390-394K remains the primary selection for applications requiring the full operating temperature range of -55°C to 125°C. This component carries Active product status from API Delevan Inc. and is RoHS non-compliant, which may be relevant for specific legacy or non-regulated applications.

1140-391K-RC Substitute Suitability: The 1140-391K-RC from Bourns Inc. functions as a direct electrical substitute when operating temperatures remain within its specified range of -55°C to 105°C. This component holds ROHS3 Compliant certification, offering advantage in regulated markets and new product designs subject to environmental compliance mandates. The substitute provides superior saturation current performance (10.4 A versus 6.8 A), enhancing circuit reliability under transient conditions. Both components maintain identical DC resistance characteristics critical for thermal design calculations.

Compliance Consideration: If RoHS3 compliance is a project requirement, the 1140-391K-RC is the appropriate selection. If operation above 105°C is mandatory, the DC1390-394K remains the only viable option among these alternatives.

Frequently Asked Questions (FAQ)

Q: Can the 1140-391K-RC replace the DC1390-394K in all applications? A: Electrical substitution is valid when operating temperature remains within -55°C to 105°C. If your design operates above 105°C, the DC1390-394K is required. Both components provide identical inductance, DC resistance, and saturation performance within the 5.39 A to 5.8 A current range.

Q: How do the physical dimensions affect substitution? A: The substitute (1140-391K-RC) is marginally larger in diameter (1.500" versus 1.480") and slightly shorter in height (1.030" versus 1.064"). These minimal variations are typically accommodated in through-hole circuit board layouts, but PCB footprint verification is necessary for compact designs.

Q: What is the significance of the higher saturation current in the 1140-391K-RC? A: The 1140-391K-RC saturates at 10.4 A compared to the DC1390-394K at 6.8 A. This provides additional margin against saturation-induced inductance loss during current transients, delivering improved circuit stability without changing nominal inductance performance.

Q: Are both components suitable for 1 kHz measurement frequency applications? A: Yes. Both the DC1390-394K and 1140-391K-RC are specified at 1 kHz inductance test frequency, ensuring consistent inductance values across both components when measured under identical conditions.

Q: What compliance differences should I consider? A: The 1140-391K-RC holds ROHS3 compliance, making it the appropriate choice for regulated consumer electronics and products requiring environmental certifications. The DC1390-394K is RoHS non-compliant and may be restricted in certain markets.

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