Bourns 6729 100µH Toroidal Inductor Equivalent & Substitute Parts

Part Overview

The Bourns 6729 is a 100µH shielded toroidal inductor rated for 2.5A continuous current with 80mOhm maximum DC resistance. 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. Equivalent parts must maintain the same inductance value, core shielding characteristics, and electrical performance within specified tolerances to ensure circuit functionality.

Key Parameters

Parameter	Specification
Inductance	100 µH
Inductance Tolerance	±15%
Current Rating	2.5 A
DC Resistance (DCR)	80 mOhm Max
Core Material	Iron Powder
Shielding	Shielded
Mounting Type	Through Hole
Package Type	Radial, Vertical, 4 Leads (Open)
Operating Temperature Range	-55°C to 105°C
Inductance Test Frequency	1 kHz

Substitute Part Grouping Explanation

Substitution eligibility for the Bourns 6729 is determined by the following critical parameters:

Inductance Value: Must be 100µH with ±15% tolerance
Core Type & Shielding: Iron powder core with shielding required
DC Resistance: Maximum 80mOhm
Mounting Configuration: Through-hole radial/vertical orientation
Current Capability: Minimum 2.5A rating (higher ratings are acceptable)
Operating Temperature: Must support -55°C to 105°C range or equivalent
Test Frequency: 1 kHz inductance measurement standard

The API Delevan PT100-1000 qualifies as a direct substitute based on matching inductance, core material, shielding, DC resistance, mounting type, and test frequency. The higher current rating (4.6A vs. 2.5A) provides additional design margin without compromising circuit compatibility.

Parameter Comparison

Parameter	Bourns 6729	API Delevan PT100-1000	Match Status
Inductance	100 µH	100 µH	Exact Match
Inductance Tolerance	±15%	±15%	Exact Match
Current Rating (Amps)	2.5 A	4.6 A	Substitute Exceeds
DC Resistance (DCR)	80 mOhm Max	80 mOhm Max	Exact Match
Core Material	Iron Powder	Iron Powder	Exact Match
Shielding	Shielded	Shielded	Exact Match
Mounting Type	Through Hole	Through Hole	Exact Match
Package / Case	Radial, Vertical, 4 Leads (Open)	Radial, Vertical (Open)	Compatible
Inductance Test Frequency	1 kHz	1 kHz	Exact Match
RoHS Status	Non-compliant	Non-compliant	Equivalent
REACH Status	Unaffected	Unaffected	Equivalent
ECCN Classification	EAR99	EAR99	Exact Match
HTSUS Code	8504.50.4000	8504.50.4000	Exact Match

Engineering Selection Recommendations

The API Delevan PT100-1000 is a qualified substitute for the obsolete Bourns 6729. Selection is based on the following factors:

Product Status: The Bourns 6729 is obsolete, while the API Delevan PT100-1000 maintains active product status, ensuring ongoing availability and supply chain reliability.

Electrical Equivalence: Both components share identical inductance (100µH ±15%), DC resistance (80mOhm max), core material (iron powder), and shielding characteristics. The PT100-1000 provides a higher current rating (4.6A vs. 2.5A), which is compatible with applications designed for the 6729 and offers additional thermal margin.

Compliance & Certifications: Both parts carry identical RoHS non-compliant status, REACH unaffected classification, EAR99 export control designation, and HTSUS commodity code 8504.50.4000. No compliance conflicts exist between the original and substitute.

Mechanical Compatibility: Both components feature through-hole radial/vertical mounting with open lead configurations suitable for PCB assembly processes. Physical dimensions differ slightly, requiring verification of PCB footprint clearance during board layout review.

Frequently Asked Questions (FAQ)

Q: Can the API Delevan PT100-1000 directly replace the Bourns 6729 in existing designs?

A: Yes. The PT100-1000 meets all critical electrical parameters: 100µH inductance at ±15% tolerance, 80mOhm maximum DC resistance, iron powder shielded core, and through-hole radial/vertical mounting. The higher current rating (4.6A) is compatible with 2.5A circuit requirements. PCB footprint dimensions should be verified before production implementation.

Q: What are the key differences between these two inductors?

A: The primary differences are product status (Bourns 6729 is obsolete; API Delevan PT100-1000 is active), current rating (2.5A vs. 4.6A), and physical dimensions. Electrical performance and core characteristics are equivalent.

Q: Are there any compliance or regulatory concerns with substitution?

A: No. Both components share identical RoHS non-compliant status, REACH unaffected classification, and EAR99 export control designation. No additional compliance review is required for substitution.

Q: Does the higher current rating of the PT100-1000 affect circuit performance?

A: No. A higher current rating does not negatively impact circuit operation. The substitute component will perform identically to the original within the specified 2.5A operating range, with improved thermal performance due to lower core losses at rated current.

Q: What should be verified before implementing the substitute part?

A: Confirm PCB footprint compatibility by comparing lead spacing and component height. Both parts use radial/vertical through-hole configurations with 4 open leads, but physical dimensions differ slightly (Bourns: 0.850" L x 0.425" W x 1.000" H; API Delevan: 1.000" Dia x 0.360" W). Verify clearance in the target PCB layout.

Q: Is the PT100-1000 available in the same packaging as the Bourns 6729?

A: The PT100-1000 is supplied in bulk packaging, while the Bourns 6729 was supplied with standard packaging designation. Both use identical through-hole radial/vertical lead configurations. Confirm packaging requirements with your procurement department.

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