Bourns 9250-274 270µH Shielded Drum Core Inductor: Equivalent & Substitute Parts

Part Overview

The Bourns 9250-274 is a 270 µH shielded drum core wirewound inductor rated for 115 mA with a maximum DC resistance of 5.8 Ohm. This through-hole axial component operates across -55°C to 105°C and features ferrite core construction with ±10% inductance tolerance. The part is currently obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and production requirements.

Substiute Parts

9250-274

Bourns Inc.In Stock: 8659250-274 Datasheet

Current PartRFQ

9250A-274-RC

Bourns Inc.In Stock: 12649250A-274-RC Datasheet

DirectRFQ

ER1641-274KM

API Delevan Inc.In Stock: 854ER1641-274KM Datasheet

SimilarRFQ

ER1641-274KP

API Delevan Inc.In Stock: 812ER1641-274KP Datasheet

SimilarRFQ

ER1641-274KR

API Delevan Inc.In Stock: 1114ER1641-274KR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Bourns 9250-274 is determined by strict equivalence across the following electrical and mechanical parameters:

• Inductance value: 270 µH with ±10% tolerance
• Current rating: 115 mA minimum
• DC resistance: 5.8 Ohm maximum
• Saturation current: 70 mA or higher
• Shielding: Shielded construction required
• Core material: Ferrite
• Frequency characteristics: Q factor of 55 @ 790 kHz and self-resonant frequency of 7 MHz
• Operating temperature: -55°C to 105°C minimum
• Mounting and package: Through-hole axial configuration
• Physical dimensions: 0.162" diameter × 0.410" length

The Bourns 9250A-274-RC qualifies as a direct manufacturer upgrade, maintaining all electrical specifications while transitioning from drum core to molded construction and extending the operating temperature range to 125°C. The API Delevan ER1641 series (274KM, 274KP, 274KR variants) provide functional equivalence with identical electrical performance and physical form factor, differing only in packaging format (tape and reel).

Parameter Comparison

Engineering Selection Recommendations

The Bourns 9250A-274-RC is the primary recommended substitute for the obsolete 9250-274. This part maintains complete electrical and mechanical compatibility while offering active product status and RoHS3 compliance. The extended operating temperature range to 125°C provides additional thermal margin for demanding applications. Bulk packaging is suitable for standard production workflows.

The API Delevan ER1641 series (274KM, 274KP, 274KR) provides functionally equivalent alternatives with identical electrical specifications and physical form factor. These parts are supplied in tape and reel packaging, appropriate for automated assembly processes. All three ER1641 variants are active products with equivalent performance characteristics; selection among them depends on packaging and supply chain requirements.

For applications requiring RoHS3 compliance, the Bourns 9250A-274-RC is the only compliant option among the active substitutes. For applications with existing RoHS non-compliant designs, the API Delevan ER1641 series maintains compatibility with the original 9250-274 compliance profile.

Frequently Asked Questions (FAQ)

Q: Can the Bourns 9250A-274-RC be used as a direct replacement for the 9250-274?

A: Yes. The 9250A-274-RC maintains all electrical specifications (270 µH inductance, 115 mA current rating, 5.8 Ohm DC resistance, 55 Q factor at 790 kHz, 7 MHz self-resonant frequency) and physical dimensions (0.162" diameter × 0.410" length). The primary differences are construction type (molded versus drum core), extended operating temperature range (-55°C to 125°C versus -55°C to 105°C), and RoHS3 compliance status.

Q: What are the differences between the Bourns 9250A-274-RC and the API Delevan ER1641 series?

A: Electrical and mechanical specifications are identical. The primary differences are manufacturer (Bourns versus API Delevan), packaging format (bulk versus tape and reel), and RoHS compliance status (RoHS3 compliant versus RoHS non-compliant). Operating temperature ranges are equivalent at -55°C to 105°C for the ER1641 series.

Q: Are the ER1641-274KM, ER1641-274KP, and ER1641-274KR interchangeable?

A: Yes. All three variants are functionally equivalent with identical electrical specifications and physical dimensions. Selection depends on packaging and supply chain requirements, as all are supplied in tape and reel format.

Q: Does the extended temperature range of the 9250A-274-RC affect circuit performance?

A: The extended operating range to 125°C does not alter the electrical specifications within the -55°C to 105°C window. Applications operating within the original temperature range experience no performance change.

Q: What packaging considerations apply to these substitutes?

A: The Bourns 9250A-274-RC is supplied in bulk packaging suitable for manual or semi-automated assembly. The API Delevan ER1641 series is supplied in tape and reel format optimized for automated pick-and-place assembly. Physical form factor (0.162" diameter × 0.410" length axial package) is identical across all parts.