Bourns 5721 250µH Toroidal Inductor Equivalent & Substitute Parts

Part Overview

The Bourns 5721 is a 250µH unshielded toroidal inductor rated for 8A continuous current with a maximum DC resistance of 41mOhm. This through-hole component features an iron powder core and operates across the temperature range of -55°C to 105°C. The 5721 is classified as obsolete, making identification of active equivalent parts essential for ongoing production and maintenance applications. The substitute part 5721-RC provides functional equivalence while maintaining active product status and improved compliance certifications.

Substiute Parts

5721

Bourns Inc.In Stock: 9155721 Datasheet

Current PartRFQ

5721-RC

Bourns Inc.In Stock: 14755721-RC Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Bourns 5721-RC qualifies as a direct substitute based on matching electrical and mechanical parameters. Substitution is valid when the following criteria are met:

• Inductance value: 250 µH (identical)
• Inductance tolerance: ±15% (identical)
• Current rating: 8 A (identical)
• DC resistance: 41 mOhm maximum (identical)
• Core material: Iron Powder (identical)
• Shielding configuration: Unshielded (identical)
• Operating temperature range: -55°C to 105°C (identical)
• Mounting type: Through Hole (identical)
• Package configuration: Radial, Vertical (Open) (identical)
• Inductance test frequency: 1 kHz (identical)

The 5721-RC maintains all critical electrical specifications and mechanical compatibility with the original 5721, enabling direct substitution in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The Bourns 5721-RC is the appropriate selection for new designs and production applications. The original 5721 is obsolete and no longer actively manufactured. The 5721-RC maintains identical electrical and mechanical specifications while offering ROHS3 compliance, addressing regulatory requirements for modern manufacturing environments. Both parts share the same REACH and ECCN classifications, ensuring equivalent export and supply chain compliance. Selection between these parts is determined by product lifecycle stage: the 5721-RC for active production and the 5721 only for legacy system maintenance where existing inventory remains available.

Frequently Asked Questions (FAQ)

Q: Can the 5721-RC be used as a direct replacement for the 5721 in existing circuits?

A: Yes. The 5721-RC provides electrical and mechanical equivalence across all specified parameters, including inductance value, current rating, DC resistance, core material, temperature range, and mounting configuration. Direct substitution is valid for circuit applications.

Q: What is the primary difference between the 5721 and 5721-RC?

A: The 5721-RC is the active production variant with ROHS3 compliance, while the 5721 is obsolete and RoHS non-compliant. Both parts maintain identical electrical specifications and mechanical form factors.

Q: Are there physical dimension differences between these parts?

A: Yes. The 5721 has a diameter of 0.875" (22.22mm) with a width of 0.437" (11.10mm), while the 5721-RC has a diameter of 2.125" (53.97mm) with a width of 0.937" (23.80mm). Physical layout verification is required during board redesign or component substitution.

Q: What packaging options are available?

A: The 5721 is supplied in standard packaging, while the 5721-RC is available in bulk packaging. Packaging selection depends on procurement volume and supply chain requirements.

Q: Are both parts suitable for the same operating temperature applications?

A: Yes. Both the 5721 and 5721-RC operate across the identical temperature range of -55°C to 105°C, supporting equivalent thermal performance in circuit applications.