Bourns 9250-186 Fixed Inductor: Equivalent & Substitute Parts

Part Overview

The Bourns 9250-186 is an 18 mH shielded drum core wirewound inductor rated for 21 mA maximum current with 175 Ohm DC resistance. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part operates across a temperature range of -55°C to 105°C and is designed for through-hole axial mounting applications requiring ferrite core shielding.

Substiute Parts

9250-186

Bourns Inc.In Stock: 11579250-186 Datasheet

Current PartRFQ

4307-186K

API Delevan Inc.In Stock: 9034307-186K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Bourns 9250-186 is determined by the following critical parameters:

• Inductance Value: Must be 18 mH ±10% tolerance
• Shielding: Must be shielded ferrite core construction
• Mounting Configuration: Must be through-hole axial package
• Current Handling: Substitute must support minimum 21 mA operation
• DC Resistance: Must not exceed application circuit requirements
• Operating Temperature Range: Must cover -55°C minimum to 105°C minimum
• Frequency Characteristics: Q factor and self-resonant frequency must be compatible with circuit application

The API Delevan 4307-186K meets these substitution criteria with equivalent inductance, shielding, and mounting type, while offering enhanced current rating and extended temperature range.

Parameter Comparison

Engineering Selection Recommendations

The API Delevan 4307-186K is a direct functional substitute for the obsolete Bourns 9250-186. Both components share identical inductance values, tolerance specifications, shielding characteristics, and core materials. The substitute part is currently in active production status, ensuring long-term availability and supply chain continuity.

The 4307-186K provides superior current handling capacity at 41 mA compared to the original 21 mA rating, and extends the maximum operating temperature to 125°C. The increased DC resistance of 225 Ohm versus 175 Ohm must be evaluated within the specific circuit application to confirm acceptable performance.

Both parts maintain equivalent Q factor performance at 79 kHz and identical saturation current specifications. Compliance status remains consistent between the two components, with both classified as RoHS non-compliant and REACH unaffected.

Frequently Asked Questions (FAQ)

Q: Can the API Delevan 4307-186K directly replace the Bourns 9250-186 in existing designs?

A: Yes, the 4307-186K is functionally equivalent for applications requiring 18 mH inductance with shielded ferrite core construction and through-hole axial mounting. The higher current rating and extended temperature range provide additional design margin. Circuit validation is required to confirm the increased DC resistance does not impact performance.

Q: What is the primary difference between these two inductors?

A: The main differences are current rating (41 mA vs. 21 mA), DC resistance (225 Ohm vs. 175 Ohm), maximum operating temperature (125°C vs. 105°C), and product status (active vs. obsolete). Inductance, tolerance, shielding, and core material are identical.

Q: Are there packaging differences between the Bourns 9250-186 and API Delevan 4307-186K?

A: Both components use through-hole axial packaging. The 4307-186K is supplied in Tape & Reel format, while the 9250-186 packaging format is not specified in available data. Physical dimensions differ slightly: 9250-186 is 0.162" diameter × 0.410" length; 4307-186K is 0.197" diameter × 0.447" length.

Q: What compliance certifications apply to the substitute part?

A: The API Delevan 4307-186K carries the same compliance designations as the original: RoHS non-compliant, REACH unaffected, and ECCN EAR99 classification.

Q: Is the saturation current specification identical between both parts?

A: Yes, both the Bourns 9250-186 and API Delevan 4307-186K specify 10 mA saturation current (Isat).