28333C Equivalent & Substitute Parts

Part Overview

The Murata Power Solutions 28333C is a 33 µH unshielded wirewound surface mount inductor rated for 3.22 A with a maximum DC resistance of 63mOhm. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The part operates across a temperature range of -40°C to 125°C and is RoHS compliant with unlimited moisture sensitivity rating.

Substiute Parts

28333C

Murata Power Solutions Inc.In Stock: 94228333C Datasheet

Current PartRFQ

P0250.333NL

Pulse ElectronicsIn Stock: 3256P0250.333NL Datasheet

MFR RecommendedRFQ

SDR1806-330ML

Bourns Inc.In Stock: 1832SDR1806-330ML Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 28333C are selected based on the following critical parameters:

• Inductance Value: Must be 33 µH to maintain circuit functionality
• Current Rating: Substitute must support minimum 3 A continuous current; the original 3.22 A rating establishes the baseline requirement
• DC Resistance: Maximum 68mOhm acceptable; values within 63-68mOhm range maintain equivalent power dissipation characteristics
• Shielding Configuration: Unshielded topology required for electromagnetic compatibility with original circuit design
• Mounting Technology: Surface mount package mandatory for PCB integration compatibility
• Operating Temperature Range: Minimum -40°C to 125°C coverage required
• Compliance Standards: RoHS compliance required for regulatory alignment

Both substitute parts meet these criteria while offering active product status and improved availability compared to the obsolete 28333C.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are suitable replacements for the obsolete 28333C based on electrical parameter alignment and compliance certifications.

P0250.333NL (Pulse Electronics) offers the closest dimensional match with footprint dimensions of 18.62mm x 15.14mm and height of 7.36mm, minimizing PCB layout modifications. This part maintains active product status with ROHS3 compliance and extended operating temperature range to 130°C. The 66mOhm DCR represents a 4.8% increase over the original specification, within acceptable tolerance for most applications.

SDR1806-330ML (Bourns) provides the most compact profile at 18.30mm x 14.00mm with 6.90mm height, offering potential space savings on constrained PCBs. This part features ferrite drum core construction with active product status and ROHS3 compliance. The 68mOhm DCR represents a 7.9% increase over the original specification. Tape & Reel packaging supports automated assembly processes.

Both parts maintain unshielded topology, unlimited moisture sensitivity rating, and REACH unaffected status consistent with the original component.

Frequently Asked Questions (FAQ)

Q: Can the P0250.333NL or SDR1806-330ML be used directly as drop-in replacements for the 28333C?

A: Both parts are electrically compatible substitutes with matching 33 µH inductance and current ratings of 3 A, which satisfies the original 3.22 A requirement. Dimensional differences are minor; verify PCB footprint clearances before implementation. The P0250.333NL offers closer dimensional alignment, while the SDR1806-330ML provides a more compact footprint.

Q: What is the impact of the increased DC resistance in substitute parts?

A: The P0250.333NL exhibits 66mOhm DCR (3mOhm increase) and the SDR1806-330ML exhibits 68mOhm DCR (5mOhm increase) compared to the original 63mOhm specification. These increases result in proportionally higher power dissipation. Calculate actual power loss using P = I²R with your circuit's operating current to determine if thermal management adjustments are necessary.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both the P0250.333NL and SDR1806-330ML are ROHS3 compliant, meeting current regulatory requirements. The original 28333C is RoHS compliant, and both substitutes maintain or exceed this compliance level.

Q: What are the packaging differences between substitute options?

A: The P0250.333NL is supplied in standard packaging, while the SDR1806-330ML is supplied in Tape & Reel format, which is optimized for automated pick-and-place assembly. Select based on your manufacturing process requirements.

Q: Do the substitute parts support the same operating temperature range?

A: The SDR1806-330ML and original 28333C both operate from -40°C to 125°C. The P0250.333NL extends this range to -40°C to 130°C, providing additional thermal margin in high-temperature applications.