Bourns 9250-105 Fixed Inductor: Equivalent & Substitute Parts

Part Overview

The Bourns 9250-105 is a 1 mH shielded drum core wirewound inductor rated for 70 mA continuous current with a maximum DC resistance of 17.5 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 electromagnetic shielding.

The 9250-105 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for legacy systems.

Substiute Parts

9250-105

Bourns Inc.In Stock: 7809250-105 Datasheet

Current PartRFQ

9250A-105-RC

Bourns Inc.In Stock: 29869250A-105-RC Datasheet

DirectRFQ

ER1641-105KM

API Delevan Inc.In Stock: 1114ER1641-105KM Datasheet

SimilarRFQ

ER1641-105KP

API Delevan Inc.In Stock: 838ER1641-105KP Datasheet

SimilarRFQ

ER1641-105KR

API Delevan Inc.In Stock: 818ER1641-105KR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Bourns 9250-105 is determined by strict equivalence across the following electrical and mechanical parameters:

• Inductance value: 1 mH
• Tolerance: ±10%
• Current rating: 70 mA minimum
• DC resistance: 17.5 Ohm maximum
• Q factor: 60 @ 790 kHz
• Self-resonant frequency: 3.8 MHz
• Core material: Ferrite
• Shielding requirement: Shielded (primary criterion)
• Mounting type: Through hole axial
• Physical dimensions: 0.162" Dia x 0.410" L (4.11 mm x 10.41 mm)
• Operating temperature range: -55°C to 105°C minimum

Substitute parts are classified into two categories:

Direct Manufacturer Substitute: Parts from Bourns Inc. that maintain identical electrical specifications and physical form factor with updated construction or compliance status.

Similar Manufacturer Substitutes: Parts from alternative manufacturers (API Delevan Inc.) that meet all electrical and mechanical parameters. Shielding configuration is a critical differentiator; unshielded variants are listed separately due to electromagnetic performance differences.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: Bourns 9250A-105-RC

The 9250A-105-RC is the direct manufacturer substitute for the obsolete 9250-105. This part maintains identical electrical specifications and physical dimensions while offering the following advantages:

• Active product status with ongoing manufacturer support
• ROHS3 compliance, meeting current environmental regulations
• Extended operating temperature range (-55°C to 125°C) providing additional thermal margin
• Molded construction versus drum core, offering improved mechanical robustness
• Bulk packaging available for production quantities

Secondary Recommendations: API Delevan ER1641 Series

The ER1641-105KM and ER1641-105KP are functionally equivalent shielded inductors from API Delevan Inc. Both parts meet all electrical and mechanical specifications of the 9250-105:

• Active product status
• Tape & Reel packaging suitable for automated assembly
• Identical inductance, current rating, DC resistance, and Q factor
• Shielded construction maintaining electromagnetic isolation

Not Recommended for Direct Substitution: ER1641-105KR

The ER1641-105KR is an unshielded variant of the ER1641 series. While it matches all other electrical parameters, the absence of shielding creates a fundamental performance difference. This part is suitable only for applications where electromagnetic shielding is not a design requirement. The ER1641-105KR is qualified to MIL-PRF-39010/03 military specifications.

Frequently Asked Questions (FAQ)

Q: Can the 9250A-105-RC be used as a direct replacement for the 9250-105 in existing designs?

A: Yes. The 9250A-105-RC maintains identical electrical specifications (1 mH inductance, 70 mA current rating, 17.5 Ohm DCR, 60 Q @ 790 kHz) and physical dimensions (0.162" Dia x 0.410" L). The primary differences are product status (active versus obsolete), RoHS compliance (ROHS3 versus non-compliant), and construction method (molded versus drum core). No circuit redesign is required.

Q: What is the difference between the Bourns 9250A-105-RC and the API Delevan ER1641-105KM?

A: Both parts are electrically and mechanically equivalent. The differences are manufacturer origin and packaging format. The 9250A-105-RC is supplied in bulk packaging by Bourns Inc., while the ER1641-105KM is supplied in Tape & Reel format by API Delevan Inc. Selection depends on procurement preferences, supply chain availability, and assembly process requirements.

Q: Why is the ER1641-105KR listed separately from the ER1641-105KM and ER1641-105KP?

A: The ER1641-105KR is an unshielded inductor, whereas the 9250-105 and other listed substitutes are shielded. Shielding provides electromagnetic isolation and is a critical design parameter. The ER1641-105KR is suitable only for applications where shielding is not required. Use of an unshielded part in a design requiring shielding will result in performance degradation.

Q: Does the extended temperature range of the 9250A-105-RC (-55°C to 125°C versus -55°C to 105°C) affect compatibility?

A: No. The extended temperature range of the 9250A-105-RC is a superset of the original 9250-105 specification. This provides additional operational margin and is not a compatibility concern. The part will function correctly across the original -55°C to 105°C range and beyond.

Q: What packaging formats are available for these substitute parts?

A: The 9250A-105-RC is available in bulk packaging. The ER1641-105KM, ER1641-105KP, and ER1641-105KR are available in Tape & Reel format. Packaging selection depends on production volume and assembly automation requirements.

Q: Are there RoHS compliance differences between the substitute options?

A: Yes. The 9250A-105-RC is ROHS3 compliant. The ER1641-105KM, ER1641-105KP, and ER1641-105KR are RoHS non-compliant. For applications subject to RoHS regulations, the 9250A-105-RC is the appropriate selection.