Bourns 9250-182-RC Equivalent & Substitute Parts

Part Overview

The Bourns 9250-182-RC is a 1.8 µH shielded drum core wirewound inductor rated for 775 mA with a maximum DC resistance of 140 mOhm. This through-hole axial component operates across -55°C to 105°C and is designed for applications requiring shielded inductive filtering and energy storage. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Inductance	1.8 µH
Tolerance	±10%
Current Rating	775 mA
DC Resistance (Max)	140 mOhm
Shielding	Shielded
Core Material	Ferrite
Q @ 7.9 MHz	44
Self Resonant Frequency	105 MHz
Operating Temperature Range	-55°C to 105°C
Package / Case	Axial
Size	0.162" Dia x 0.410" L (4.11mm x 10.41mm)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters: inductance value (1.8 µH), tolerance (±10%), DC resistance (140 mOhm maximum), shielding requirement (shielded), current rating capability, package type (axial through-hole), and physical dimensions (0.162" Dia x 0.410" L).

The substitute parts are grouped into two categories:

Direct Manufacturer Substitute (Bourns Series): The 9250A-182-RC maintains identical electrical specifications and physical dimensions while offering an active product status with an extended operating temperature range (-55°C to 125°C). This part uses molded construction instead of drum core but preserves all critical electrical parameters.

Similar Manufacturer Substitutes (API Delevan ER1641 Series): The ER1641-182KM and ER1641-182KP variants provide equivalent inductance, tolerance, DC resistance, and shielding with a 20 mA reduction in current rating (755 mA vs. 775 mA). The ER1641-182KR is an unshielded variant and is not suitable for applications requiring shielding.

Parameter Comparison

Parameter	9250-182-RC (Main)	9250A-182-RC	ER1641-182KM	ER1641-182KP	ER1641-182KR
Manufacturer	Bourns Inc.	Bourns Inc.	API Delevan Inc.	API Delevan Inc.	API Delevan Inc.
Inductance	1.8 µH	1.8 µH	1.8 µH	1.8 µH	1.8 µH
Tolerance	±10%	±10%	±10%	±10%	±10%
Current Rating (Amps)	775 mA	775 mA	755 mA	755 mA	755 mA
DC Resistance (Max)	140 mOhm	140 mOhm	140 mOhm	140 mOhm	140 mOhm
Shielding	Shielded	Shielded	Shielded	Shielded	Unshielded
Core Material	Ferrite	Ferrite	Iron	Iron	Iron
Q @ 7.9 MHz	44	44	44	44	44
Self Resonant Frequency	105 MHz	105 MHz	105 MHz	105 MHz	105 MHz
Operating Temperature Range	-55°C to 105°C	-55°C to 125°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C
Package / Case	Axial	Axial	Axial	Axial	Axial
Size	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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Non-Compliant	RoHS Non-Compliant	RoHS Non-Compliant

Engineering Selection Recommendations

Primary Substitute: The Bourns 9250A-182-RC is the preferred direct substitute. It maintains identical electrical performance and physical dimensions while offering active product status and extended temperature range capability (-55°C to 125°C vs. -55°C to 105°C). Both parts are ROHS3 compliant, ensuring regulatory alignment for new designs and legacy system maintenance.

Secondary Substitutes: The API Delevan ER1641-182KM and ER1641-182KP are functionally equivalent for applications where the 20 mA current rating reduction (755 mA vs. 775 mA) is acceptable. Both maintain shielding, inductance, tolerance, and DC resistance specifications. However, these parts are RoHS non-compliant, limiting their use in applications with strict environmental compliance requirements.

Not Recommended: The ER1641-182KR is unsuitable as a substitute due to its unshielded construction, which does not meet the shielding requirement of the original 9250-182-RC specification.

Frequently Asked Questions (FAQ)

Q: Can the 9250A-182-RC directly replace the obsolete 9250-182-RC?

A: Yes. The 9250A-182-RC provides direct electrical and mechanical compatibility with identical inductance (1.8 µH), tolerance (±10%), current rating (775 mA), DC resistance (140 mOhm), shielding, and physical dimensions. The primary differences are active product status and extended operating temperature range (-55°C to 125°C).

Q: What is the impact of the 20 mA current rating difference in the ER1641 series?

A: The ER1641-182KM and ER1641-182KP are rated for 755 mA versus the original 775 mA. This 20 mA reduction may be acceptable for applications operating below 755 mA. Applications requiring the full 775 mA rating must use the 9250A-182-RC.

Q: Why is the ER1641-182KR not a suitable substitute?

A: The ER1641-182KR is unshielded, whereas the original 9250-182-RC and all recommended substitutes are shielded. Shielding is critical for EMI suppression and noise isolation in sensitive circuit applications. Unshielded variants will not provide equivalent electromagnetic performance.

Q: Are there RoHS compliance differences between substitutes?

A: Yes. The Bourns 9250A-182-RC is ROHS3 compliant, matching the original part. The API Delevan ER1641 series (all variants) are RoHS non-compliant. For applications requiring RoHS compliance, the 9250A-182-RC is the only suitable substitute.

Q: Do all substitutes maintain the same physical footprint?

A: Yes. All substitute parts share identical axial package dimensions of 0.162" Dia x 0.410" L (4.11mm x 10.41mm), ensuring direct PCB compatibility without layout modifications.

Q: What is the difference between drum core and molded construction?

A: The original 9250-182-RC uses drum core construction, while the 9250A-182-RC uses molded construction. Both achieve identical electrical specifications and shielding performance. Molded construction offers improved mechanical robustness and is the current manufacturing standard for the Bourns 9250A series.

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