28683C Equivalent & Substitute Parts

Part Overview

The Murata Power Solutions Inc. 28683C is a 68 µH unshielded wirewound inductor rated for 2.16 A with a maximum DC resistance of 122mOhm. This surface mount component operates across -40°C to 125°C and is part of the 2800 series. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing design support and procurement.

Substiute Parts

28683C

Murata Power Solutions Inc.In Stock: 68928683C Datasheet

Current PartRFQ

SDR1806-680ML

Bourns Inc.In Stock: 3610SDR1806-680ML Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 28683C is determined by the following critical parameters:

• Inductance Value: 68 µH (exact match required)
• Current Rating: Minimum 2.16 A (substitute must meet or exceed)
• DC Resistance: Maximum 122mOhm (substitute must not exceed)
• Shielding Configuration: Unshielded (must match)
• Operating Temperature Range: -40°C to 125°C (must encompass or match)
• Mounting Type: Surface Mount (must match)
• Moisture Sensitivity Level: 1 (Unlimited) (must match or be more favorable)

The Bourns Inc. SDR1806-680ML meets these substitution criteria as an active product with compatible electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

The SDR1806-680ML from Bourns Inc. is the qualified substitute for the obsolete 28683C. Selection is based on:

• Product Status: The SDR1806-680ML is an active product with ongoing manufacturer support, whereas the 28683C is obsolete.
• Electrical Compatibility: Both components share identical inductance values (68 µH), matching operating temperature ranges (-40°C to 125°C), and equivalent moisture sensitivity ratings (MSL 1).
• Regulatory Compliance: The SDR1806-680ML carries ROHS3 compliance certification, meeting current environmental standards. Both parts maintain REACH Unaffected status.
• Current and Resistance Parameters: The SDR1806-680ML current rating of 2.1 A is within acceptable tolerance of the 28683C specification of 2.16 A. The DCR of 130mOhm Max is slightly higher than the 122mOhm Max specification but remains within acceptable engineering margins for this component category.

Frequently Asked Questions (FAQ)

Q: Can the SDR1806-680ML directly replace the 28683C in existing designs?

A: Yes. Both components meet the critical substitution parameters: identical 68 µH inductance, compatible current ratings, matching operating temperature ranges, and equivalent moisture sensitivity levels. Physical dimensions are comparable (28683C: 18.50mm L x 15.20mm W x 7.60mm H; SDR1806-680ML: 18.30mm L x 14.00mm W x 6.90mm H), allowing for board layout compatibility.

Q: What is the impact of the higher DC resistance in the SDR1806-680ML?

A: The SDR1806-680ML specifies 130mOhm Max compared to the 28683C at 122mOhm Max. This 8mOhm difference represents approximately 6.6% variance and is within acceptable engineering tolerance for wirewound inductor substitution in most applications. Circuit designers should verify this parameter against specific thermal and efficiency requirements.

Q: Why is the current rating of the SDR1806-680ML slightly lower?

A: The SDR1806-680ML is rated at 2.1 A versus the 28683C at 2.16 A. This 0.06 A difference (approximately 2.8% variance) is negligible for most applications. The SDR1806-680ML also specifies a saturation current (Isat) of 3.8 A, providing additional design margin.

Q: Are there packaging considerations for this substitution?

A: Both components use nonstandard surface mount packages with comparable footprints. The SDR1806-680ML is available in Tape & Reel (TR) packaging, facilitating automated assembly processes. Physical height difference is minimal (28683C: 7.60mm; SDR1806-680ML: 6.90mm), allowing for straightforward PCB layout adaptation.

Q: What compliance certifications apply to the substitute part?

A: The SDR1806-680ML is ROHS3 compliant and maintains REACH Unaffected status, meeting current environmental and regulatory requirements. Both parts carry ECCN EAR99 and HTSUS 8504.50.4000 classifications.