Bourns 9250-394 390µH Shielded Drum Core Inductor – Equivalent & Substitute Parts

Part Overview

The Bourns 9250-394 is a 390 µH shielded drum core wirewound inductor rated for 105 mA continuous current with 7.4Ω maximum DC resistance. This through-hole axial component operates across -55°C to 105°C and features ferrite core construction with ±10% inductance tolerance. The part is classified as obsolete, making equivalent substitutes necessary for new designs and production continuity. Active alternatives from both Bourns and API Delevan maintain identical electrical specifications while offering improved product status and compliance profiles.

Substiute Parts

9250-394

Bourns Inc.In Stock: 11199250-394 Datasheet

Current PartRFQ

9250A-394-RC

Bourns Inc.In Stock: 10319250A-394-RC Datasheet

DirectRFQ

ER1641-394KM

API Delevan Inc.In Stock: 1107ER1641-394KM Datasheet

SimilarRFQ

ER1641-394KP

API Delevan Inc.In Stock: 1186ER1641-394KP Datasheet

SimilarRFQ

ER1641-394KR

API Delevan Inc.In Stock: 847ER1641-394KR Datasheet

SimilarRFQ

ER1641-394KS

API Delevan Inc.In Stock: 1150ER1641-394KS Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across electrical and mechanical parameters. All substitute parts maintain identical inductance (390 µH), tolerance (±10%), current rating (105 mA), DC resistance (7.4Ω max), core material (ferrite), shielding (shielded), Q factor (60 @ 790 kHz), self-resonant frequency (6.2 MHz), test frequency (790 kHz), mounting type (through hole), package style (axial), and physical dimensions (0.162" Dia × 0.410" L).

Substitutes are classified into two categories:

Direct Manufacturer Substitute: The Bourns 9250A-394-RC represents the active production equivalent from the original manufacturer, differing only in construction type (molded vs. drum core) and offering extended operating temperature range (-55°C to 125°C) with RoHS3 compliance.

Cross-Manufacturer Substitutes: The API Delevan ER1641 series (ER1641-394KP, ER1641-394KM, ER1641-394KR, ER1641-394KS) provides functionally equivalent alternatives with identical electrical performance and physical form factor, available in tape & reel packaging.

Parameter Comparison

Engineering Selection Recommendations

For RoHS3-compliant applications: Select Bourns 9250A-394-RC. This part maintains full electrical equivalence to the 9250-394 while providing active product status, RoHS3 compliance, and extended operating temperature range to 125°C. Bulk packaging is suitable for standard procurement workflows.

For tape & reel packaging requirements: Any API Delevan ER1641 variant (ER1641-394KP, ER1641-394KM, ER1641-394KR, ER1641-394KS) provides equivalent electrical performance with automated assembly compatibility. All four variants are electrically identical; selection depends on supplier availability and lead time.

For legacy non-compliant designs: API Delevan ER1641 series parts maintain the original RoHS non-compliant status of the 9250-394 while offering active product availability and cross-manufacturer sourcing flexibility.

Frequently Asked Questions (FAQ)

Q: Can the Bourns 9250A-394-RC directly replace the 9250-394 in existing designs?

A: Yes. The 9250A-394-RC maintains identical electrical specifications (390 µH, 105 mA, 7.4Ω DCR, 60 Q @ 790 kHz) and physical dimensions (0.162" Dia × 0.410" L axial). The only differences are construction type (molded vs. drum core) and extended temperature range (-55°C to 125°C vs. -55°C to 105°C), both of which are backward compatible.

Q: Are the API Delevan ER1641 series parts electrically equivalent?

A: Yes. All ER1641 variants (ER1641-394KP, ER1641-394KM, ER1641-394KR, ER1641-394KS) provide identical inductance (390 µH), tolerance (±10%), current rating (105 mA), DC resistance (7.4Ω), core material (ferrite), shielding, Q factor (60 @ 790 kHz), and physical form factor. Differences exist only in packaging format (tape & reel) and supplier inventory.

Q: What is the difference between the four ER1641 part numbers?

A: The ER1641-394KP, ER1641-394KM, ER1641-394KR, and ER1641-394KS are electrically and mechanically identical. Variations in the suffix letter reflect different manufacturing batches or supplier designations but do not affect electrical performance or physical compatibility.

Q: Is the 9250A-394-RC suitable for applications requiring RoHS compliance?

A: Yes. The 9250A-394-RC is RoHS3 compliant, making it appropriate for designs subject to RoHS directives. The original 9250-394 and all API Delevan ER1641 variants are RoHS non-compliant.

Q: Can I use tape & reel packaged parts (ER1641 series) in place of bulk packaged parts (9250A-394-RC)?

A: Yes, from an electrical and mechanical standpoint. Tape & reel packaging is designed for automated assembly equipment. If your assembly process uses manual insertion or bulk component handling, the 9250A-394-RC bulk packaging may be more practical, though the components themselves are functionally identical.

Q: What is the operating temperature difference between the 9250-394 and 9250A-394-RC?

A: The 9250-394 operates from -55°C to 105°C, while the 9250A-394-RC extends to 125°C. For applications operating within the original -55°C to 105°C range, both parts are equivalent. For higher temperature environments, the 9250A-394-RC provides additional thermal margin.