Bourns 6702 25µH Shielded Toroidal Inductor Equivalent & Substitute Parts

Part Overview

The Bourns 6702 is a 25µH shielded toroidal inductor rated for 5.5A continuous current with a maximum DC resistance of 14mOhm. This through-hole component features an iron powder core and is designed for radial, vertical mounting with 4 open leads. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications requiring this inductance value and current rating.

Substiute Parts

6702

Bourns Inc.In Stock: 8246702 Datasheet

Current PartRFQ

PT25-800

API Delevan Inc.In Stock: 725PT25-800 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Bourns 6702 is determined by the following critical parameters:

• Inductance Value: Must be 25µH (±15% tolerance acceptable)
• Current Rating: Must meet or exceed 5.5A continuous current
• DC Resistance: Must not exceed 14mOhm maximum
• Core Type: Iron powder core required for equivalent performance
• Shielding: Shielded construction required
• Mounting: Through-hole, radial vertical configuration
• Lead Configuration: 4-lead open package
• Test Frequency: 1 kHz inductance measurement standard

The API Delevan PT25-800 meets the inductance, core material, shielding, mounting type, and test frequency requirements. However, it exceeds the maximum DC resistance specification and has different lead configuration characteristics.

Parameter Comparison

Engineering Selection Recommendations

The API Delevan PT25-800 provides functional substitution for the obsolete Bourns 6702 based on matching inductance, core material, shielding, and mounting characteristics. The PT25-800 offers superior current rating capability at 6.6A versus the original 5.5A specification.

The primary consideration is DC resistance: the PT25-800 maximum of 25mOhm exceeds the Bourns 6702 specification of 14mOhm maximum. This increased resistance will result in higher power dissipation in applications operating at rated current. Circuit designs with thermal margin or lower operating currents may accommodate this variance. Applications with strict power dissipation budgets or thermal constraints require evaluation of the resistance impact.

Both parts maintain identical RoHS non-compliance status, REACH unaffected classification, EAR99 export control designation, and HTSUS commodity code alignment, ensuring regulatory consistency in component substitution.

Frequently Asked Questions (FAQ)

Q: Can the API Delevan PT25-800 directly replace the Bourns 6702 in all applications?

A: The PT25-800 matches the critical inductance, core material, shielding, and mounting specifications. However, the increased DC resistance (25mOhm vs. 14mOhm) will increase power dissipation. Applications operating at or near 5.5A continuous current should evaluate thermal performance with the higher resistance value.

Q: What is the significance of the current rating difference between these parts?

A: The Bourns 6702 is rated for 5.5A continuous current, while the PT25-800 is rated for 6.6A. The higher rating on the substitute part provides additional current capacity margin. This does not affect substitution suitability for applications within the original 5.5A specification.

Q: Are the physical dimensions compatible?

A: The Bourns 6702 measures 0.875" L x 0.425" W with a maximum seated height of 1.000". The PT25-800 measures 0.800" Dia x 0.350" W. Both use radial, vertical through-hole mounting. Physical layout verification is required to confirm PCB footprint compatibility.

Q: Do these parts have identical regulatory compliance?

A: Both parts are RoHS non-compliant, REACH unaffected, classified as EAR99 for export control, and share the same HTSUS commodity code (8504.50.4000). Regulatory status is consistent between the original and substitute part.

Q: What is the tolerance specification for inductance?

A: Both the Bourns 6702 and API Delevan PT25-800 maintain ±15% inductance tolerance, measured at 1 kHz test frequency. This tolerance applies equally to both parts.

Q: How does the DC resistance affect circuit performance?

A: DC resistance causes I²R power dissipation in the inductor. At 5.5A, the Bourns 6702 dissipates approximately 0.423W (5.5² × 0.014), while the PT25-800 dissipates approximately 0.756W (5.5² × 0.025). The substitute part generates 79% additional heat at identical current levels. Thermal design review is necessary for applications with limited heat dissipation capability.