Equivalent & Substitute Parts for Bourns 5521-RC

Part Overview

The Bourns 5521-RC is a 5 µH unshielded drum core wirewound inductor rated for 23 A continuous current with a maximum DC resistance of 4 mOhm. This through-hole component is designed for radial, horizontal cylinder mounting in applications requiring fixed inductance values with high current capacity. The 5521-RC is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications.

Substiute Parts

5521-RC

Bourns Inc.In Stock: 7525521-RC Datasheet

Current PartRFQ

1538M21

Hammond ManufacturingIn Stock: 8701538M21 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Bourns 5521-RC is determined by strict equivalence across the following critical parameters:

• Inductance value: 5 µH (exact match required)
• Current rating: 23 A minimum
• DC resistance: 4 mOhm maximum
• Shielding configuration: Unshielded
• Mounting type: Through hole
• Package form factor: Radial, horizontal cylinder
• Physical dimensions: 0.720" Dia x 1.380" L (18.28mm x 35.05mm)
• Inductance test frequency: 1 kHz

The Hammond Manufacturing 1538M21 meets all substitution criteria for the obsolete Bourns 5521-RC. Both components share identical electrical specifications and mechanical form factors, enabling direct replacement in existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

The Hammond Manufacturing 1538M21 is the direct equivalent substitute for the obsolete Bourns 5521-RC. Both components are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The 1538M21 offers the additional advantage of active product status with current manufacturing availability, whereas the 5521-RC is obsolete. The Hammond part features a tighter inductance tolerance of ±10% compared to the Bourns ±20%, providing improved circuit performance consistency. Physical dimensions are equivalent within manufacturing tolerances. Selection of the 1538M21 eliminates obsolescence risk while maintaining full electrical and mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the Hammond 1538M21 directly replace the Bourns 5521-RC in existing designs?

A: Yes. Both components share identical inductance (5 µH), current rating (23 A), DC resistance (4 mOhm max), shielding configuration (unshielded), mounting type (through hole), and physical form factor (radial, horizontal cylinder). Direct substitution is supported without circuit modification.

Q: What is the significance of the tolerance difference between the two parts?

A: The Bourns 5521-RC specifies ±20% inductance tolerance, while the Hammond 1538M21 specifies ±10%. The tighter tolerance of the Hammond part provides improved consistency in inductance values across production batches, which may benefit circuit performance in applications sensitive to inductance variation.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both the Bourns 5521-RC and Hammond 1538M21 are ROHS3 compliant and REACH unaffected. They meet equivalent regulatory requirements for current applications.

Q: Why is the Bourns 5521-RC listed as obsolete?

A: The Bourns 5521-RC has been discontinued by the manufacturer. The Hammond 1538M21 remains in active production, making it the recommended choice for new designs and ongoing component procurement.

Q: Are the physical dimensions identical between the two parts?

A: The dimensions are equivalent within manufacturing tolerances. Both parts measure 0.720" diameter by 1.380" length (approximately 18.28-18.29mm diameter by 35.05mm length). This equivalence ensures compatibility with existing PCB layouts and mechanical assemblies.