DC1390-124K Equivalent & Substitute Parts

Part Overview

The DC1390-124K is a 120 µH fixed unshielded inductor manufactured by API Delevan Inc., rated for 9.23 A continuous current with a maximum DC resistance of 28 mOhm. This through-hole radial component operates across the temperature range of -55°C to 125°C and is currently in active production status. Alternative equivalent parts may be required due to inventory availability, compliance requirements, or specific application constraints such as saturation current performance or operating temperature specifications.

Substiute Parts

DC1390-124K

API Delevan Inc.In Stock: 861DC1390-124K Datasheet

Current PartRFQ

1140-121K-RC

Bourns Inc.In Stock: 16291140-121K-RC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DC1390-124K is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

• Inductance value: 120 µH at 1 kHz test frequency
• Inductance tolerance: ±10%
• DC resistance: 28 mOhm maximum
• Mounting type: Through hole
• Package configuration: Radial, vertical cylinder
• Core material: Ferrite
• Shielding classification: Unshielded

Secondary Compatibility Parameters:

• Current rating: minimum 9.23 A continuous
• Saturation current: minimum 12.3 A
• Operating temperature range: must encompass or exceed -55°C to 125°C

The substitute part 1140-121K-RC from Bourns Inc. meets all primary equivalence criteria and demonstrates enhanced performance in saturation current (18.6 A versus 12.3 A) and comparable current rating (9.9 A versus 9.23 A). Physical dimensions remain within acceptable tolerance for radial through-hole mounting applications.

Parameter Comparison

Engineering Selection Recommendations

DC1390-124K (API Delevan Inc.) remains the primary specification when the full operating temperature range of -55°C to 125°C is required and RoHS non-compliance is acceptable for the application.

1140-121K-RC (Bourns Inc.) serves as a direct functional substitute with the following considerations:

• Compliance Advantage: ROHS3 compliant, addressing regulatory requirements where the original part does not meet standards
• Performance Enhancement: Higher saturation current (18.6 A) and current rating (9.9 A) provide additional design margin
• Temperature Limitation: Operating temperature maximum of 105°C restricts use in applications requiring the full -55°C to 125°C range
• Product Status: Both parts are active production items with confirmed inventory availability

Selection between these parts depends on whether the application requires the extended upper temperature limit (125°C) or benefits from RoHS3 compliance and enhanced current ratings.

Frequently Asked Questions (FAQ)

Q: Can the 1140-121K-RC replace the DC1390-124K in all applications?

A: The 1140-121K-RC is functionally equivalent for inductance, DC resistance, and mounting characteristics. However, applications operating above 105°C require the DC1390-124K due to its 125°C maximum temperature rating. Applications requiring RoHS3 compliance benefit from the 1140-121K-RC.

Q: What is the significance of the higher saturation current in the 1140-121K-RC?

A: The 1140-121K-RC saturation current of 18.6 A versus 12.3 A in the DC1390-124K indicates greater core material headroom before magnetic saturation occurs. This provides additional design margin in applications with transient current spikes or demanding load conditions.

Q: Are the physical dimensions interchangeable?

A: Both parts use radial, vertical cylinder packaging suitable for through-hole mounting. The DC1390-124K measures 1.480" diameter by 1.064" height; the 1140-121K-RC measures 1.500" diameter by 1.030" height. These dimensional differences are within acceptable tolerance for standard through-hole PCB layouts.

Q: Does RoHS compliance affect electrical performance?

A: RoHS3 compliance in the 1140-121K-RC reflects material composition changes but does not alter the specified electrical parameters of inductance, DC resistance, or current rating. Electrical performance remains equivalent to the DC1390-124K.

Q: Which part should be selected for new designs?

A: For new designs without strict temperature requirements above 105°C, the 1140-121K-RC is preferred due to ROHS3 compliance and enhanced saturation current performance. For applications requiring the full -55°C to 125°C operating range, the DC1390-124K is the appropriate selection.