473R3SC Equivalent & Substitute Parts

Part Overview

The 473R3SC is a 3.3 µH shielded wirewound inductor manufactured by Murata Power Solutions Inc., rated for 6.4 A continuous current with a maximum DC resistance of 11.1mOhm. This component is classified as obsolete, necessitating identification of active equivalent parts that maintain functional compatibility across power supply and filtering applications. Substitute parts must preserve the core inductance value, shielding characteristics, and thermal operating range while accommodating variations in current ratings and DC resistance within acceptable design margins.

Substiute Parts

473R3SC

Murata Power Solutions Inc.In Stock: 666473R3SC Datasheet

Current PartRFQ

7447715003

Würth ElektronikIn Stock: 28917447715003 Datasheet

MFR RecommendedRFQ

BPSC001313453R3T00

Pulse ElectronicsIn Stock: 1225BPSC001313453R3T00 Datasheet

MFR RecommendedRFQ

SRR1205-3R3ML

Bourns Inc.In Stock: 1795SRR1205-3R3ML Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following mandatory parameters:

• Inductance Value: All substitutes must match 3.3 µH with tolerance specifications compatible to ±30%
• Shielding Configuration: All substitutes must maintain shielded construction to preserve EMI performance
• Mounting Technology: All substitutes must be surface mount compatible
• DC Resistance: Substitutes with higher DC resistance values are acceptable provided they remain within design thermal budgets; lower values are preferred
• Current Rating: Substitutes with current ratings at or above 4.5 A are functionally compatible; lower ratings require application-specific verification
• Operating Temperature: Substitutes with extended temperature ranges (-40°C ~ 125°C) provide enhanced reliability margins over the original -40°C ~ 85°C specification
• RoHS/REACH Compliance: All substitutes must maintain RoHS3 compliance and REACH unaffected status

All three substitute parts meet these criteria and are classified as active products with current manufacturing availability.

Parameter Comparison

Engineering Selection Recommendations

7447715003 (Würth Elektronik WE-PD Series) provides the closest electrical match to the 473R3SC with a current rating of 5.9 A and DC resistance of 13mOhm. This part carries AEC-Q200 automotive qualification and operates across an extended temperature range of -40°C ~ 125°C. The 1.9mOhm increase in DC resistance relative to the original part is within acceptable design margins for most power conversion applications. ROHS3 compliance and active product status ensure long-term supply availability.

BPSC001313453R3T00 (Pulse Electronics BPSC Series) offers a shielded ferrite core construction with 15mOhm maximum DC resistance. While current rating is not specified, the saturation current of 8.8 A indicates adequate headroom for applications requiring up to 6.4 A continuous operation. Extended temperature range and ROHS3 compliance support reliability requirements. This part is suitable for applications where DC resistance tolerance is less critical.

SRR1205-3R3ML (Bourns SRR1205 Series) provides the tightest inductance tolerance at ±20% and includes published Q factor and self-resonant frequency specifications. The 4.5 A current rating and 30mOhm DC resistance represent the most conservative electrical performance among substitutes. This part is recommended only for applications where current requirements do not exceed 4.5 A and where the higher DC resistance does not compromise thermal or efficiency budgets. ROHS3 compliance and active status are confirmed.

Frequently Asked Questions (FAQ)

Q: Can 7447715003 directly replace 473R3SC in existing designs? A: Yes, provided the application current does not exceed 5.9 A. The 1.9mOhm increase in DC resistance will produce proportionally higher I²R losses; verify thermal performance in your specific circuit topology.

Q: What is the impact of higher DC resistance in substitute parts? A: DC resistance directly affects power dissipation (P = I²R). At 6.4 A, the original 11.1mOhm produces 0.454 W; 7447715003 at 13mOhm produces 0.531 W; BPSC001313453R3T00 at 15mOhm produces 0.614 W. Confirm thermal design margins accommodate these increases.

Q: Are all substitutes compatible with the original PCB footprint? A: All substitutes use nonstandard surface mount packages. Physical dimensions vary: 473R3SC is 12.20mm × 12.20mm × 5.00mm; 7447715003 is 12.00mm × 12.00mm × 4.50mm; BPSC001313453R3T00 is 12.50mm × 12.50mm × 4.50mm; SRR1205-3R3ML is 12.70mm × 12.70mm × 5.50mm. Verify PCB layout compatibility before implementation.

Q: Which substitute offers the best long-term supply assurance? A: All three substitutes are classified as active products with current manufacturing status. 7447715003 and BPSC001313453R3T00 each maintain inventory exceeding 2,800 units; SRR1205-3R3ML maintains 1,782 units. All carry ROHS3 compliance and REACH unaffected status, supporting regulatory continuity.

Q: Can SRR1205-3R3ML be used in applications requiring 6.4 A continuous current? A: No. The 4.5 A current rating of SRR1205-3R3ML is below the 6.4 A requirement of the original design. Use only in applications where continuous current does not exceed 4.5 A.

Q: What is the significance of the extended temperature range in substitutes? A: All substitutes operate to -40°C ~ 125°C versus the original -40°C ~ 85°C. This provides 40°C additional margin at the upper temperature limit, improving reliability in high-ambient or high-power-density applications without design modification.