Bourns 6708 400µH Shielded Toroidal Inductor Equivalent & Substitute Parts

Part Overview

The Bourns 6708 is a 400µH shielded toroidal inductor rated for 2.25A continuous current with a maximum DC resistance of 330mOhm. This through-hole component features an iron powder core and operates across the temperature range of -55°C to 105°C. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

6708

Bourns Inc.In Stock: 8516708 Datasheet

Current PartRFQ

PT400-1200

API Delevan Inc.In Stock: 896PT400-1200 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Bourns 6708 is determined by the following critical parameters:

• Inductance Value: Must be 400µH with ±15% tolerance
• Current Rating: Substitute must support minimum 2.25A continuous current
• DC Resistance: Lower or equal DCR values are acceptable; higher values indicate increased losses
• Core Type: Iron powder core construction required for equivalent electromagnetic performance
• Shielding: Shielded configuration mandatory to maintain EMI containment
• Mounting Configuration: Through-hole radial/vertical orientation with compatible lead count and spacing
• Test Frequency: Inductance measured at 1 kHz per specification

The API Delevan PT400-1200 meets all substitution criteria with equivalent inductance, superior current rating (2.4A vs 2.25A), and improved DC resistance (250mOhm vs 330mOhm).

Parameter Comparison

Engineering Selection Recommendations

The API Delevan PT400-1200 is a direct functional substitute for the Bourns 6708. Selection is based on the following factors:

• Product Status: The PT400-1200 maintains active production status, ensuring long-term availability and supply chain stability compared to the obsolete 6708
• Electrical Performance: The PT400-1200 exceeds minimum specifications with higher current rating (2.4A) and lower DC resistance (250mOhm), resulting in reduced power dissipation
• Compliance Alignment: Both components share identical RoHS and REACH status classifications
• Physical Compatibility: Both components utilize through-hole radial/vertical mounting with open lead configurations suitable for PCB integration
• Core Technology: Iron powder core construction is maintained across both components, preserving electromagnetic characteristics

Frequently Asked Questions (FAQ)

Q: Can the PT400-1200 directly replace the Bourns 6708 in existing designs?

A: Yes. Both components share identical inductance values (400µH ±15%), core materials (iron powder), shielding configuration, and through-hole mounting type. The PT400-1200 provides superior electrical performance with higher current rating and lower DC resistance.

Q: What is the significance of the lower DC resistance in the PT400-1200?

A: The PT400-1200 exhibits 250mOhm maximum DC resistance compared to 330mOhm in the 6708. This 24% reduction in resistance decreases I²R losses, resulting in lower operating temperature and improved efficiency in current-carrying applications.

Q: Are there physical dimension differences between these components?

A: Yes. The Bourns 6708 measures 1.125" L × 0.600" W with 1.250" seated height. The API Delevan PT400-1200 measures 1.200" diameter × 0.550" width. PCB layout verification is required to confirm mechanical fit within existing designs.

Q: Do both components operate across the same temperature range?

A: The Bourns 6708 specifies -55°C to 105°C operating temperature. The PT400-1200 does not provide an operating temperature specification in the available data. Temperature range compatibility must be verified against application requirements.

Q: What compliance considerations apply to component selection?

A: Both components are RoHS non-compliant and REACH unaffected. Design teams must confirm that existing compliance requirements permit non-RoHS components or pursue alternative solutions if RoHS compliance is mandatory.