Murata 493R3SC Equivalent & Substitute Parts

Part Overview

The Murata 493R3SC is a 3.3 µH shielded wirewound inductor rated for 8.4 A continuous current with a maximum DC resistance of 10mOhm. This component is part of the 4900S series and is actively manufactured. The part operates across the industrial temperature range of -40°C to 85°C and is housed in a nonstandard 4-lead surface mount package measuring 12.20mm × 12.20mm × 8.00mm (max height). Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for this inductance value and current rating category.

Substiute Parts

493R3SC

Murata Power Solutions Inc.In Stock: 821493R3SC Datasheet

Current PartRFQ

SRR1280-3R3Y

Bourns Inc.In Stock: 2284SRR1280-3R3Y Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Murata 493R3SC is determined by the following criteria:

Primary Electrical Parameters:

• Inductance value: 3.3 µH (±30% tolerance band)
• Current rating: minimum 8.4 A continuous
• DC resistance: maximum 10mOhm (lower values acceptable)
• Shielding: required (shielded construction)

Mechanical Parameters:

• Mounting type: Surface Mount
• Package configuration: Nonstandard, 4-lead
• Physical dimensions: compatible with 12.20mm × 12.20mm footprint and 8.00mm maximum height
• Lead configuration: 4-lead

Compliance & Environmental:

• RoHS3 compliance required
• Operating temperature range: minimum -40°C to 85°C (extended ranges acceptable)
• Moisture sensitivity level: MSL 1 or equivalent

The Bourns SRR1280-3R3Y meets these substitution criteria through equivalent inductance, higher current rating (8.8 A), comparable DC resistance (12mOhm max), identical shielding, compatible surface mount package, and matching compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

Murata 493R3SC (Primary Part): The original Murata part remains the preferred selection when supply is available. It is actively manufactured, RoHS3 compliant, and meets all specified electrical and mechanical requirements. The part carries MSL 1 rating and is suitable for applications requiring the exact original component specification.

Bourns SRR1280-3R3Y (Substitute Part): The Bourns SRR1280-3R3Y is qualified as a direct substitute when Murata 493R3SC availability is constrained. The substitute part provides equivalent inductance (3.3 µH) with identical tolerance (±30%), higher current rating (8.8 A vs. 8.4 A), and extended operating temperature range (-40°C to 125°C vs. -40°C to 85°C). DC resistance is marginally higher at 12mOhm maximum compared to 10mOhm maximum, remaining within acceptable design margins for this component category. Both parts are RoHS3 compliant, MSL 1 rated, and employ surface mount technology with compatible 4-lead nonstandard packages. Physical dimensions are nearly identical with maximum height matching at 8.00mm.

Selection between these parts should be based on availability, lead time, and cost considerations, as both meet the electrical and mechanical requirements for this application category.

Frequently Asked Questions (FAQ)

Q: Can the Bourns SRR1280-3R3Y be used as a direct replacement for the Murata 493R3SC?

A: Yes. Both parts share identical inductance (3.3 µH), tolerance (±30%), shielding, mounting type, and package height. The Bourns part has a higher current rating (8.8 A vs. 8.4 A) and extended temperature range, making it functionally compatible. The 2mOhm increase in maximum DC resistance (12mOhm vs. 10mOhm) is within acceptable tolerance for this component class.

Q: What are the key electrical parameters that determine substitution eligibility?

A: Substitution is based on inductance value (3.3 µH ±30%), current rating (minimum 8.4 A), DC resistance (maximum 10mOhm for primary part), and shielding requirement. The substitute part must maintain these electrical characteristics within specified tolerances.

Q: Are there mechanical compatibility concerns between these parts?

A: Both parts are surface mount components with nonstandard 4-lead packages and identical maximum heights (8.00mm). Footprint dimensions are nearly identical (12.20mm vs. 12.50mm), presenting no practical placement or routing issues in standard PCB layouts.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the Murata 493R3SC and Bourns SRR1280-3R3Y are RoHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity ratings. Both are classified under ECCN EAR99 and HTSUS 8504.50.4000.

Q: What is the temperature operating range difference, and does it matter for substitution?

A: The Murata part operates from -40°C to 85°C, while the Bourns substitute operates from -40°C to 125°C. The extended upper temperature limit of the Bourns part does not create compatibility issues and may provide additional design margin in thermally demanding applications.

Q: How do the DC resistance values compare, and what is the practical impact?

A: The Murata part specifies 10mOhm maximum DC resistance, while the Bourns substitute specifies 12mOhm maximum. This 2mOhm difference results in minimal additional power dissipation and is acceptable for applications designed around the original 10mOhm specification.