28103C Equivalent & Substitute Parts

Part Overview

The 28103C is a 10 µH unshielded wirewound inductor manufactured by Murata Power Solutions Inc., rated for 5.9 A continuous current with a maximum DC resistance of 18mOhm. This component is classified as obsolete, making identification of compatible substitute parts essential for ongoing design support and procurement continuity. The part operates across the industrial temperature range of -40°C to 125°C and is suitable for surface mount applications in nonstandard package configurations.

Substiute Parts

28103C

Murata Power Solutions Inc.In Stock: 108128103C Datasheet

Current PartRFQ

SDR1806-100ML

Bourns Inc.In Stock: 1405SDR1806-100ML Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 28103C is determined by the following critical parameters:

• Inductance value: 10 µH (exact match required)
• Current rating: minimum 5.3 A (acceptable if ≥ 5.9 A design requirement or application permits lower rating)
• DC resistance: maximum 25mOhm (acceptable if ≤ 18mOhm or application thermal budget permits higher losses)
• Shielding configuration: unshielded (matching electromagnetic environment requirements)
• Mounting type: surface mount (PCB assembly compatibility)
• Operating temperature range: -40°C ~ 125°C (minimum requirement)
• Package footprint: physical dimensions within acceptable tolerance for PCB layout

The SDR1806-100ML from Bourns Inc. meets these substitution criteria with matching inductance, compatible current rating, and equivalent operating temperature range, though with increased DC resistance and different core material composition.

Parameter Comparison

Engineering Selection Recommendations

The SDR1806-100ML represents a viable substitute for the obsolete 28103C based on the following factors:

• Both components maintain identical 10 µH inductance specification
• Operating temperature range is equivalent across -40°C to 125°C
• The SDR1806-100ML is active product status, ensuring long-term availability and supply chain continuity
• RoHS3 compliance of the substitute part aligns with current regulatory requirements
• Physical dimensions are comparable with minimal PCB layout impact (height reduction of 0.027")
• Unshielded configuration matches the original design environment

Design considerations for substitution include the 0.6 A reduction in current rating (5.9 A to 5.3 A) and the 7mOhm increase in maximum DC resistance. These differences require evaluation against specific circuit operating conditions and thermal management capabilities.

Frequently Asked Questions (FAQ)

Q: Can the SDR1806-100ML directly replace the 28103C in existing designs?

A: Direct substitution is possible if circuit operating current does not exceed 5.3 A and the increased DC resistance of 25mOhm (versus 18mOhm) does not create unacceptable power dissipation or thermal conditions. Physical dimensions are compatible with minor PCB layout adjustments.

Q: What is the impact of the 7mOhm increase in DC resistance?

A: At rated current, the SDR1806-100ML dissipates approximately 0.7 W more power than the 28103C (5.3 A × 25mOhm = 0.703 W versus 5.9 A × 18mOhm = 0.626 W at equivalent current). Thermal design must accommodate this difference.

Q: Are there packaging differences between these parts?

A: Both components use nonstandard surface mount packages. The SDR1806-100ML is supplied in Tape & Reel (TR) packaging, while the 28103C packaging format is not specified. Verify reel compatibility with assembly equipment.

Q: Does the different core material affect performance?

A: The SDR1806-100ML uses ferrite drum core construction versus the unspecified core material of the 28103C. Both maintain unshielded configuration and equivalent operating temperature range. Frequency response characteristics differ slightly (Q @ 2.52MHz for SDR1806-100ML versus Q @ 1MHz for 28103C).

Q: What compliance certifications apply to substitution?

A: The SDR1806-100ML carries ROHS3 compliance and REACH Unaffected status, matching the regulatory framework of the original 28103C. Both components are classified under ECCN EAR99 and HTSUS 8504.50.4000.