DC1390-684K Equivalent & Substitute Parts

Part Overview

The DC1390-684K is a 680 µH unshielded inductor manufactured by API Delevan Inc., rated for 4.14 A continuous current with a maximum DC resistance of 139mOhm. This through-hole radial component operates across the industrial temperature range of -55°C to 125°C and is currently in active production status. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances.

Substiute Parts

DC1390-684K

API Delevan Inc.In Stock: 1071DC1390-684K Datasheet

Current PartRFQ

1140-681K-RC

Bourns Inc.In Stock: 12581140-681K-RC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The 1140-681K-RC from Bourns Inc. qualifies as a direct substitute based on the following critical parameters:

• Inductance Value: Both parts specify 680 µH with ±10% tolerance
• DC Resistance: Both maintain 139mOhm maximum, ensuring equivalent power dissipation characteristics
• Core Material: Both utilize ferrite cores with unshielded construction
• Mounting Configuration: Both are through-hole radial, vertical cylinder packages
• Current Rating: The substitute provides 4.4 A continuous rating, exceeding the main part's 4.14 A requirement
• Saturation Current: The substitute's 7.9 A Isat exceeds the main part's 5.11 A, providing additional margin
• Mechanical Compatibility: Both components fit radial, vertical cylinder footprints with comparable dimensional profiles

Parameter Comparison

Engineering Selection Recommendations

The 1140-681K-RC provides functional equivalence to the DC1390-684K across all critical electrical parameters. The substitute part delivers equal or superior performance in current handling and saturation characteristics. The Bourns component carries ROHS3 compliance certification, whereas the API Delevan part is RoHS non-compliant. Both components maintain REACH Unaffected status and EAR99 export classification.

Selection between these parts should account for the operating temperature ceiling: the DC1390-684K supports operation to 125°C, while the 1140-681K-RC is rated to 105°C maximum. Applications requiring sustained operation above 105°C necessitate the original DC1390-684K specification.

Frequently Asked Questions (FAQ)

Q: Can the 1140-681K-RC replace the DC1390-684K in all applications?

A: The 1140-681K-RC provides electrical and mechanical equivalence for applications operating within -55°C to 105°C. Applications requiring operation above 105°C must use the DC1390-684K.

Q: Are the physical dimensions compatible?

A: Both components use radial, vertical cylinder packages. The DC1390-684K measures 1.480" diameter × 1.064" height seated, while the 1140-681K-RC measures 1.500" diameter × 1.030" height seated. These dimensional differences are within typical PCB layout tolerances for radial through-hole components.

Q: What is the significance of the higher saturation current in the substitute part?

A: The 1140-681K-RC's 7.9 A saturation current versus the DC1390-684K's 5.11 A provides additional design margin. This allows the substitute to maintain inductance stability under transient current conditions that approach saturation limits.

Q: Do compliance certifications differ between these parts?

A: Yes. The 1140-681K-RC is ROHS3 compliant, while the DC1390-684K is RoHS non-compliant. Both maintain REACH Unaffected status. Applications subject to RoHS requirements must specify the Bourns component.

Q: How do the DC resistance values compare?

A: Both parts specify 139mOhm maximum DC resistance at 1 kHz test frequency, ensuring identical power dissipation characteristics in circuit operation.