Bourns 4630-RC 62µH Inductor: Equivalent & Substitute Parts

Part Overview

The Bourns 4630-RC is a 62 µH unshielded drum core wirewound inductor rated for 475 mA with a maximum DC resistance of 1.2Ohm. Designed for through-hole axial mounting, this component operates across the -55°C to 105°C temperature range and is ROHS3 compliant. The 4630-RC is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and production continuity.

Substiute Parts

4630-RC

Bourns Inc.In Stock: 7804630-RC Datasheet

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1537R-66J

API Delevan Inc.In Stock: 8921537R-66J Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 4630-RC is determined by the following critical parameters:

• Inductance value: 62 µH (exact match required)
• Inductance tolerance: ±5% (matching tolerance specification)
• Core material: Iron (maintains magnetic properties)
• Shielding configuration: Unshielded (electrical environment compatibility)
• Mounting type: Through hole axial (PCB layout compatibility)
• Operating temperature range: -55°C to 105°C (environmental suitability)
• RoHS compliance: ROHS3 (regulatory requirement)

The API Delevan 1537R-66J meets all core substitution criteria. However, the substitute exhibits reduced current rating (180 mA versus 475 mA) and increased DC resistance (3.15Ohm versus 1.2Ohm), which may impact circuit performance in current-limited applications.

Parameter Comparison

Engineering Selection Recommendations

The API Delevan 1537R-66J is an active product with ROHS3 compliance and REACH unaffected status, providing regulatory continuity with the obsolete 4630-RC. Both components share identical inductance values, tolerance specifications, core materials, and operating temperature ranges.

Selection of the 1537R-66J requires circuit-level evaluation of current and resistance parameters. The substitute's 180 mA current rating represents a 62% reduction from the original 475 mA specification, and the 3.15Ohm DC resistance is 2.6 times higher than the 1.2Ohm maximum of the 4630-RC. These differences will increase power dissipation and may alter circuit impedance characteristics. Applications operating at or near the original 475 mA specification cannot use this substitute without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can the API Delevan 1537R-66J directly replace the Bourns 4630-RC in all applications?

A: No. While both inductors share the same 62 µH inductance value and ±5% tolerance, the substitute has significantly lower current rating (180 mA vs. 475 mA) and higher DC resistance (3.15Ohm vs. 1.2Ohm). Direct substitution is only valid for circuits operating below 180 mA.

Q: What is the impact of the higher DC resistance in the substitute part?

A: The 1537R-66J's 3.15Ohm resistance will increase power dissipation by approximately 2.6 times at equivalent current levels. This affects thermal performance and may require circuit compensation or thermal management adjustments.

Q: Are both parts compliant with current regulatory requirements?

A: Yes. Both the 4630-RC and 1537R-66J are ROHS3 compliant and REACH unaffected, meeting current regulatory standards.

Q: What is the physical size difference between these inductors?

A: The 4630-RC measures 0.290" diameter × 0.875" length (7.37mm × 22.22mm). The 1537R-66J measures 0.156" diameter × 0.375" length (3.96mm × 9.53mm). The substitute is significantly smaller and may affect PCB layout.

Q: Why is the original part classified as obsolete?

A: The Bourns 4630-RC is listed as obsolete, indicating it is no longer manufactured. The API Delevan 1537R-66J is an active product, ensuring ongoing availability for new designs and production support.