Bourns 9250-393 39µH Shielded Drum Core Inductor – Equivalent & Substitute Parts

Part Overview

The Bourns 9250-393 is a 39 µH shielded drum core wirewound inductor rated for 205 mA with a maximum DC resistance of 1.93 Ohm. This through-hole axial component operates across the temperature range of -55°C to 105°C and is designed for applications requiring controlled inductance with ferrite core shielding.

The 9250-393 carries an obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for production and repair applications.

Substiute Parts

9250-393

Bourns Inc.In Stock: 10669250-393 Datasheet

Current PartRFQ

9250A-393-RC

Bourns Inc.In Stock: 18349250A-393-RC Datasheet

DirectRFQ

1641R-393K

DelevanIn Stock: 10331641R-393K Datasheet

SimilarRFQ

ER1641-393KM

API Delevan Inc.In Stock: 974ER1641-393KM Datasheet

SimilarRFQ

ER1641-393KP

API Delevan Inc.In Stock: 892ER1641-393KP Datasheet

SimilarRFQ

ER1641-393KR

API Delevan Inc.In Stock: 1234ER1641-393KR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 9250-393 are qualified based on the following electrical and mechanical parameters:

• Inductance value: 39 µH (±10% tolerance)
• Current rating: 205 mA minimum
• DC resistance: 1.93 Ohm maximum
• Shielding: Shielded configuration
• Core material: Ferrite
• Q factor: 50 @ 2.5 MHz
• Self resonant frequency: 29 MHz
• Operating temperature range: -55°C minimum to 105°C minimum
• Mounting and package: Through-hole axial configuration
• Physical dimensions: 0.162" Dia × 0.410" L (4.11mm × 10.41mm)

Parts meeting these criteria are classified as direct or similar substitutes. Variations in packaging format (bulk versus tape & reel) and RoHS compliance status do not affect electrical equivalence but may impact procurement and regulatory requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: Bourns 9250A-393-RC

The 9250A-393-RC is the direct successor to the obsolete 9250-393. Both parts are manufactured by Bourns Inc. and share identical electrical specifications. The 9250A-393-RC offers an extended operating temperature range (-55°C to 125°C versus -55°C to 105°C) and carries ROHS3 compliance, making it suitable for applications with regulatory requirements. This part is actively produced and available in bulk packaging.

Secondary Recommendations: Delevan 1641R-393K and API Delevan ER1641 Series

The Delevan 1641R-393K provides electrical equivalence with a marginally higher current rating (209 mA versus 205 mA) and ROHS3 compliance. This part is available in bulk packaging and maintains active production status.

The API Delevan ER1641-393KM, ER1641-393KP, and ER1641-393KR parts are electrically equivalent to the original 9250-393 and are supplied in tape & reel packaging. These parts are suitable for automated assembly processes. All three variants maintain active production status but do not carry ROHS3 compliance.

Compliance Considerations

For applications requiring RoHS3 compliance, select either the Bourns 9250A-393-RC or Delevan 1641R-393K. For applications without RoHS requirements, the API Delevan ER1641 series offers equivalent performance with tape & reel availability for high-volume manufacturing.

Frequently Asked Questions (FAQ)

Q: Can the 9250A-393-RC directly replace the obsolete 9250-393?

A: Yes. Both parts share identical electrical specifications: 39 µH inductance, 205 mA current rating, 1.93 Ohm maximum DC resistance, and ferrite shielded construction. The 9250A-393-RC offers an extended temperature range and improved compliance status. Physical dimensions and mounting type are identical.

Q: What is the difference between the Bourns 9250-393 (drum core) and 9250A-393-RC (molded)?

A: The primary difference is construction type. The original 9250-393 uses drum core wirewound construction, while the 9250A-393-RC uses molded construction. Electrical performance parameters are equivalent. Molded construction typically offers improved mechanical robustness and environmental protection.

Q: Why does the Delevan 1641R-393K have a higher current rating (209 mA) than the original part (205 mA)?

A: The 1641R-393K is rated for 209 mA, which exceeds the original 205 mA specification. This higher rating does not affect substitution compatibility; the part can be used in applications designed for 205 mA operation. All other electrical parameters remain equivalent.

Q: What is the difference between bulk and tape & reel packaging?

A: Bulk packaging is suitable for manual assembly and small-volume production. Tape & reel packaging is designed for automated pick-and-place assembly systems used in high-volume manufacturing. Electrical specifications are identical; packaging selection depends on assembly process requirements.

Q: Are the API Delevan ER1641-393KM, ER1641-393KP, and ER1641-393KR parts interchangeable?

A: Yes. All three parts are electrically and mechanically equivalent. They differ only in packaging reel specifications or internal manufacturing variants. Selection among these three should be based on reel compatibility with your assembly equipment.

Q: Which substitute part should I select for a new design?

A: For new designs, the Bourns 9250A-393-RC is the recommended choice. It is the direct successor to the obsolete 9250-393, carries ROHS3 compliance, and offers an extended operating temperature range. For high-volume automated assembly, the API Delevan ER1641 series in tape & reel format provides equivalent performance.

Q: Does RoHS compliance affect electrical performance?

A: No. RoHS compliance relates to material composition and environmental regulations, not electrical performance. Parts with and without RoHS compliance in this comparison set maintain identical electrical specifications.