Bourns 9250-181 180 nH Shielded Drum Core Wirewound Inductor Equivalent & Substitute Parts

Part Overview

The Bourns 9250-181 is a 180 nH shielded drum core wirewound inductor rated for 1.3 A with a maximum DC resistance of 47 mOhm. This through-hole axial component operates across -55°C to 105°C and features ferrite core construction with ±10% inductance tolerance. The 9250-181 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Active alternatives with identical electrical specifications and mechanical form factors are available from both Bourns and API Delevan manufacturers.

Key Parameters

Parameter	Value
Inductance	180 nH
Inductance Tolerance	±10%
Current Rating	1.3 A
DC Resistance (Max)	47 mOhm
Q Factor @ 25 MHz	50
Self Resonant Frequency	250 MHz
Shielding	Shielded
Mounting Type	Through Hole
Package / Case	Axial
Size / Dimension	0.162" Dia x 0.410" L (4.11mm x 10.41mm)
Operating Temperature Range	-55°C ~ 105°C

Substitute Part Grouping Explanation

Substitution of the Bourns 9250-181 is determined by strict equivalence across the following electrical and mechanical parameters: inductance value (180 nH), inductance tolerance (±10%), current rating (1.3 A), DC resistance (47 mOhm maximum), Q factor at 25 MHz (50), self-resonant frequency (250 MHz), shielding type (shielded), and physical form factor (axial through-hole, 0.162" diameter × 0.410" length). All substitute parts listed maintain these specifications without deviation.

The 9250A-181-RC represents a direct manufacturer upgrade from Bourns, transitioning from drum core to molded construction while preserving all electrical parameters and mechanical compatibility. The ER1641 series from API Delevan (ER1641-181KM, ER1641-181KP, ER1641-181KR, ER1641-181KS) provides functionally equivalent alternatives with molded phenolic core construction, maintaining identical electrical performance and physical dimensions.

Parameter Comparison

Parameter	9250-181 (Main)	9250A-181-RC	ER1641-181KM	ER1641-181KP	ER1641-181KR	ER1641-181KS
Manufacturer	Bourns Inc.	Bourns Inc.	API Delevan Inc.	API Delevan Inc.	API Delevan Inc.	API Delevan Inc.
Inductance	180 nH	180 nH	180 nH	180 nH	180 nH	180 nH
Tolerance	±10%	±10%	±10%	±10%	±10%	±10%
Current Rating	1.3 A	1.3 A	1.3 A	1.3 A	1.3 A	1.3 A
DC Resistance (Max)	47 mOhm	47 mOhm	47 mOhm	47 mOhm	47 mOhm	47 mOhm
Q @ 25 MHz	50	50	50	50	50	50
Self Resonant Frequency	250 MHz	250 MHz	250 MHz	250 MHz	250 MHz	250 MHz
Shielding	Shielded	Shielded	Shielded	Shielded	Shielded	Shielded
Operating Temperature	-55°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Axial	Axial	Axial	Axial	Axial	Axial
Size / Dimension	0.162" Dia x 0.410" L	0.162" Dia x 0.410" L	0.162" Dia x 0.410" L	0.162" Dia x 0.410" L	0.162" Dia x 0.410" L	0.162" Dia x 0.410" L
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant

Engineering Selection Recommendations

The Bourns 9250A-181-RC is the primary recommended substitute for the obsolete 9250-181. This part maintains full electrical and mechanical compatibility while offering active product status and ROHS3 compliance. The extended operating temperature range (-55°C to 125°C versus -55°C to 105°C) provides additional thermal margin for demanding applications.

The API Delevan ER1641 series (ER1641-181KM, ER1641-181KP, ER1641-181KR, ER1641-181KS) provides functionally equivalent alternatives with identical electrical specifications and physical form factors. These parts maintain active product status and are suitable for applications where API Delevan sourcing is preferred. All ER1641 variants are RoHS non-compliant, consistent with the original 9250-181 classification.

Selection between Bourns 9250A-181-RC and API Delevan ER1641 variants should be based on supply chain requirements, packaging preferences (bulk versus tape & reel), and compliance mandates. All listed substitutes are electrically and mechanically interchangeable within the specified parameters.

Frequently Asked Questions (FAQ)

Q: Can the 9250A-181-RC directly replace the 9250-181 in existing designs?

A: Yes. The 9250A-181-RC maintains identical inductance (180 nH), current rating (1.3 A), DC resistance (47 mOhm), Q factor (50 @ 25 MHz), self-resonant frequency (250 MHz), and physical dimensions (0.162" diameter × 0.410" length). The transition from drum core to molded construction does not affect electrical performance or mechanical fit.

Q: What is the difference between the Bourns 9250A-181-RC and the API Delevan ER1641 series?

A: Both maintain identical electrical specifications and physical form factors. The primary differences are manufacturer (Bourns versus API Delevan), core material (ferrite versus phenolic), packaging format (bulk versus tape & reel), and RoHS compliance status (9250A-181-RC is ROHS3 compliant; ER1641 variants are RoHS non-compliant). All are functionally equivalent for circuit performance.

Q: Are all ER1641 variants (KM, KP, KR, KS) electrically identical?

A: Yes. The ER1641-181KM, ER1641-181KP, ER1641-181KR, and ER1641-181KS variants share identical electrical specifications and physical dimensions. Variant designations reflect packaging or internal manufacturing differences that do not affect circuit-level performance.

Q: Does the extended temperature range of the 9250A-181-RC (-55°C to 125°C) affect compatibility?

A: No. The extended upper temperature limit of the 9250A-181-RC provides additional thermal margin but does not compromise compatibility with designs specified for the original -55°C to 105°C range. The part remains suitable for all applications within the original temperature specification.

Q: What packaging options are available for these substitutes?

A: The Bourns 9250A-181-RC is supplied in bulk packaging. The API Delevan ER1641 series (all variants) is supplied in tape & reel format. Selection should align with production assembly requirements and inventory management practices.

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