Bourns 9250-273 27µH Shielded Drum Core Inductor – Equivalent & Substitute Parts

Part Overview

The Bourns 9250-273 is a 27 µH shielded drum core wirewound inductor rated for 260 mA with a maximum DC resistance of 1.19Ω. This component is classified as obsolete, making equivalent substitutes necessary for new designs and production continuity. The part operates across the temperature range of -55°C to 105°C and is designed for through-hole axial mounting applications requiring shielded ferrite core inductors with tight tolerance specifications.

Key Parameters

Parameter	Value
Inductance	27 µH
Tolerance	±10%
Current Rating	260 mA
DC Resistance (Max)	1.19Ω
Shielding	Shielded
Core Material	Ferrite
Q @ 2.5MHz	45
Self Resonant Frequency	38 MHz
Operating Temperature	-55°C to 105°C
Mounting Type	Through Hole
Package	Axial
Size	0.162" Dia × 0.410" L (4.11mm × 10.41mm)

Substitute Part Grouping Explanation

Substitution for the 9250-273 is determined by strict equivalence across the following critical parameters: inductance value (27 µH), tolerance (±10%), current rating (260 mA minimum), DC resistance (1.19Ω maximum), shielding requirement (shielded), core material (ferrite), mounting type (through hole), and package form (axial). All substitute parts must maintain identical physical dimensions to ensure mechanical compatibility in existing PCB layouts.

The substitute parts are grouped into two categories:

Direct Manufacturer Equivalent: The 9250A-273-RC from Bourns Inc. is a direct successor with identical electrical specifications and physical dimensions. This part transitions from drum core to molded construction while maintaining all critical parameters.

Cross-Manufacturer Alternatives: The API Delevan Inc. parts (1641R-273K, ER1641-273KM, ER1641-273KP, ER1641-273KR) provide electrical equivalence with variations in packaging format and shielding configuration. These parts maintain the core electrical specifications but differ in product status, RoHS compliance, and in one case, shielding type.

Parameter Comparison

Part Number	Manufacturer	Inductance	Current Rating	DCR (Max)	Shielding	Type	Packaging	Product Status	RoHS Status	Temp Range
9250-273	Bourns Inc.	27 µH	260 mA	1.19Ω	Shielded	Drum Core, Wirewound	Bulk	Obsolete	Non-compliant	-55°C to 105°C
9250A-273-RC	Bourns Inc.	27 µH	260 mA	1.19Ω	Shielded	Molded	Bulk	Active	ROHS3 Compliant	-55°C to 125°C
1641R-273K	API Delevan Inc.	27 µH	265 mA	1.19Ω	Shielded	Molded	Bulk	Active	ROHS3 Compliant	-55°C to 105°C
ER1641-273KM	API Delevan Inc.	27 µH	260 mA	1.19Ω	Shielded	Molded	Tape & Reel	Active	Non-compliant	-55°C to 105°C
ER1641-273KP	API Delevan Inc.	27 µH	260 mA	1.19Ω	Shielded	Molded	Tape & Reel	Active	Non-compliant	-55°C to 105°C
ER1641-273KR	API Delevan Inc.	27 µH	260 mA	1.19Ω	Unshielded	Molded	Tape & Reel	Active	Non-compliant	-55°C to 105°C

Engineering Selection Recommendations

Primary Recommendation: The Bourns 9250A-273-RC is the preferred substitute. It is manufactured by the original supplier, maintains identical electrical and mechanical specifications, carries ROHS3 compliance certification, and is in active production status. The extended operating temperature range (-55°C to 125°C) provides additional thermal margin compared to the obsolete 9250-273.

Secondary Recommendations: The API Delevan 1641R-273K offers ROHS3 compliance and active product status with a marginally higher current rating (265 mA vs. 260 mA), making it suitable for applications with standard current requirements. The ER1641-273KM and ER1641-273KP variants provide identical electrical specifications in tape and reel packaging for automated assembly environments, though they retain RoHS non-compliance status.

Not Recommended for Shielded Applications: The ER1641-273KR is unshielded and is not suitable as a substitute for the shielded 9250-273 in applications requiring electromagnetic interference suppression.

Frequently Asked Questions (FAQ)

Q: Can the 9250A-273-RC directly replace the 9250-273 in existing designs?

A: Yes. The 9250A-273-RC maintains identical inductance (27 µH), current rating (260 mA), DC resistance (1.19Ω maximum), shielding, and physical dimensions (0.162" Dia × 0.410" L). The transition from drum core to molded construction does not affect electrical performance or mechanical fit.

Q: What is the difference between the Bourns and API Delevan substitutes?

A: Both manufacturers provide 27 µH shielded inductors with equivalent electrical specifications. The Bourns 9250A-273-RC is the direct successor from the original manufacturer. API Delevan parts (1641R-273K, ER1641-273KM, ER1641-273KP) are cross-manufacturer alternatives with identical core specifications but different packaging formats and compliance certifications.

Q: Why is the ER1641-273KR listed as a substitute if it is unshielded?

A: The ER1641-273KR is not a suitable substitute for shielded applications. It is included in the reference for completeness but should only be selected if the application does not require shielding.

Q: Does the higher current rating of the 1641R-273K (265 mA vs. 260 mA) affect compatibility?

A: No. A higher current rating indicates greater capacity and does not compromise compatibility. The 1641R-273K can be used in any application designed for the 9250-273 without derating concerns.

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

A: The Bourns 9250A-273-RC and API Delevan 1641R-273K are supplied in bulk packaging. The ER1641-273KM and ER1641-273KP are supplied in tape and reel format for automated pick-and-place assembly. Select based on production assembly requirements.

Q: Are there compliance differences between the substitutes?

A: Yes. The 9250A-273-RC and 1641R-273K are ROHS3 compliant. The ER1641-273KM, ER1641-273KP, and ER1641-273KR are RoHS non-compliant. Select based on regulatory requirements for the end application.

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