Bourns 5703 125µH Toroidal Inductor Equivalent & Substitute Parts

Part Overview

The Bourns 5703 is a 125 µH unshielded toroidal inductor rated for 2.75 A with a maximum DC resistance of 120mOhm. This through-hole component features an iron powder core and operates across the temperature range of -55°C to 105°C. The 5703 is classified as obsolete, making identification of active equivalent parts essential for ongoing production and design continuity. Substitute parts must maintain identical electrical specifications and mechanical form factors to ensure direct replacement without circuit redesign.

Substiute Parts

5703

Bourns Inc.In Stock: 8275703 Datasheet

Current PartRFQ

5703-RC

Bourns Inc.In Stock: 14845703-RC Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Bourns 5703 is determined by strict equivalence across all electrical and mechanical parameters. The substitute part must match the following criteria:

• Inductance value: 125 µH with ±15% tolerance
• Current rating: 2.75 A minimum
• DC resistance: 120mOhm maximum
• Core type: Iron powder
• Shielding configuration: Unshielded
• Mounting: Through hole, radial vertical orientation
• Physical dimensions: 0.875" diameter x 0.437" width
• Operating temperature range: -55°C to 105°C
• Inductance measurement frequency: 1 kHz

The Bourns 5703-RC meets all these parameters and is classified as an active product, providing continuity for applications currently using the obsolete 5703.

Parameter Comparison

Engineering Selection Recommendations

The Bourns 5703-RC is the direct active equivalent for the obsolete Bourns 5703. Both parts are electrically and mechanically identical across all specified parameters. The primary distinction is product status and compliance certification: the 5703-RC is an active product with ROHS3 compliance, whereas the 5703 is obsolete and RoHS non-compliant.

For new designs or production continuity, the 5703-RC should be selected. The part maintains full compatibility with existing PCB layouts and circuit designs originally specified for the 5703, requiring no modifications to schematic or board assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the 5703-RC be used as a direct replacement for the 5703 in existing designs?

A: Yes. The 5703-RC is electrically and mechanically identical to the 5703 across all specified parameters, including inductance, current rating, DC resistance, core material, dimensions, and operating temperature range. No circuit modifications are required.

Q: What is the difference between the 5703 and 5703-RC?

A: The primary differences are product status and compliance. The 5703 is obsolete and RoHS non-compliant, while the 5703-RC is an active product with ROHS3 compliance. Electrical and mechanical specifications are identical.

Q: Are there packaging differences between the 5703 and 5703-RC?

A: The 5703 is supplied in standard packaging, while the 5703-RC is supplied in bulk packaging. Both use identical through-hole radial vertical (open) case styles with the same physical dimensions.

Q: What is the inductance tolerance for these parts?

A: Both the 5703 and 5703-RC have an inductance tolerance of ±15%, measured at 1 kHz.

Q: Can these inductors be used in high-temperature applications?

A: Yes. Both parts are rated for operation across -55°C to 105°C, suitable for industrial and automotive temperature ranges.