Bourns 9250-182 Equivalent & Substitute Parts

Part Overview

The Bourns 9250-182 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 features ferrite core construction with ±10% inductance tolerance. The 9250-182 is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications requiring compatible 1.8 µH shielded inductors in axial through-hole packages.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution for the Bourns 9250-182 is determined by strict equivalence across the following critical parameters: inductance value (1.8 µH), inductance tolerance (±10%), current rating (minimum 775 mA), maximum DC resistance (140 mOhm), shielding requirement (shielded), Q factor (44 @ 7.9 MHz), self-resonant frequency (105 MHz), mounting type (through hole), and package configuration (axial). Physical dimensions must match or be compatible with the original 0.162" diameter x 0.410" length specification.

Substitute parts are grouped into two categories:

Direct Equivalent (Active Status): The Bourns 9250A-182-RC maintains identical electrical specifications while offering improved product status and RoHS3 compliance. This part represents the primary replacement path for the obsolete 9250-182.

Similar Equivalents (Active Status): The API Delevan ER1641 series (ER1641-182KM, ER1641-182KP, ER1641-182KR) provides functional equivalence with minor parameter variations. These parts maintain the same inductance, tolerance, DC resistance, Q factor, and self-resonant frequency. Current rating is 755 mA (20 mA lower than the original), and core material differs (iron versus ferrite). Shielding configuration varies: ER1641-182KM and ER1641-182KP are shielded; ER1641-182KR is unshielded.

Parameter Comparison

Parameter	9250-182 (Main)	9250A-182-RC (Direct)	ER1641-182KM (Similar)	ER1641-182KP (Similar)	ER1641-182KR (Similar)
Manufacturer	Bourns Inc.	Bourns Inc.	API Delevan Inc.	API Delevan Inc.	API Delevan Inc.
Series	9250	9250A	ER1641	ER1641	Military, MIL-PRF-39010/02, ER1641
Product Status	Obsolete	Active	Active	Active	Active
Type	Drum Core, Wirewound	Molded	Molded	Molded	Unshielded
Material - Core	Ferrite	Ferrite	Iron	Iron	Iron
Inductance	1.8 µH	1.8 µH	1.8 µH	1.8 µH	1.8 µH
Inductance 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
Q @ Freq	44 @ 7.9MHz	44 @ 7.9MHz	44 @ 7.9MHz	44 @ 7.9MHz	44 @ 7.9MHz
Frequency - Self Resonant	105 MHz	105 MHz	105 MHz	105 MHz	105 MHz
Operating Temperature	-55°C ~ 105°C	-55°C ~ 125°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
Package / Case	Axial	Axial	Axial	Axial	Axial
Size / Dimension	0.162" Dia x 0.410" L (4.11mm x 10.41mm)	0.162" Dia x 0.410" L (4.11mm x 10.41mm)	0.162" Dia x 0.410" L (4.11mm x 10.41mm)	0.162" Dia x 0.410" L (4.11mm x 10.41mm)	0.162" Dia x 0.410" L (4.11mm x 10.41mm)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant
Packaging	-	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Recommendation: Bourns 9250A-182-RC

The 9250A-182-RC is the direct equivalent replacement for the obsolete 9250-182. This part maintains identical electrical specifications including inductance, current rating, DC resistance, Q factor, and self-resonant frequency. The 9250A-182-RC offers active product status, ensuring long-term availability and supply chain stability. The part achieves ROHS3 compliance, meeting modern regulatory requirements. Operating temperature range extends to 125°C, providing enhanced thermal margin compared to the original 105°C maximum. Packaging is available in bulk format.

Secondary Recommendation: API Delevan ER1641-182KM or ER1641-182KP

The ER1641-182KM and ER1641-182KP are suitable alternatives when shielding is required and the 20 mA reduction in current rating (755 mA versus 775 mA) is acceptable for the application. Both parts maintain identical inductance, tolerance, DC resistance, Q factor, and self-resonant frequency. These parts are active products supplied in tape and reel packaging. Core material differs (iron versus ferrite), which may affect frequency response characteristics in specific circuit topologies. Both parts are RoHS non-compliant.

Tertiary Recommendation: API Delevan ER1641-182KR

The ER1641-182KR is applicable only when shielding is not required. This unshielded variant maintains the same electrical specifications as the shielded ER1641 options but offers military qualification under MIL-PRF-39010/02. Selection of this part requires confirmation that EMI shielding is not a circuit requirement.

Frequently Asked Questions (FAQ)

Q: Can the 9250A-182-RC directly replace the 9250-182 without circuit modification?

A: Yes. The 9250A-182-RC maintains identical inductance (1.8 µH), tolerance (±10%), current rating (775 mA), DC resistance (140 mOhm), Q factor (44 @ 7.9 MHz), and self-resonant frequency (105 MHz). Physical dimensions and axial through-hole mounting are identical. No circuit modification is required.

Q: What is the impact of using ER1641-182KM or ER1641-182KP instead of the 9250-182?

A: The ER1641 series maintains inductance, tolerance, DC resistance, Q factor, and self-resonant frequency specifications. Current rating is reduced by 20 mA (755 mA versus 775 mA). Core material differs (iron versus ferrite), which may introduce minor frequency response variations. Shielding is maintained in both KM and KP variants. These parts are suitable if the application current does not exceed 755 mA.

Q: When should ER1641-182KR be selected over the shielded alternatives?

A: The ER1641-182KR unshielded variant should be selected only when EMI shielding is not required by the circuit design. This part offers military qualification under MIL-PRF-39010/02. All other electrical specifications remain equivalent to the shielded ER1641 options.

Q: Are there packaging format differences between substitute parts?

A: Yes. The 9250A-182-RC is supplied in bulk packaging. The ER1641 series (ER1641-182KM, ER1641-182KP, ER1641-182KR) is supplied in tape and reel format. Packaging selection depends on production volume and assembly equipment compatibility.

Q: Does the extended operating temperature range of the 9250A-182-RC (-55°C to 125°C) provide any advantage?

A: The 9250A-182-RC supports operation to 125°C compared to 105°C for the original 9250-182 and all ER1641 variants. This extended range provides additional thermal margin in applications operating near temperature limits but does not affect electrical performance within the original -55°C to 105°C specification window.

Q: What is the RoHS compliance status of available substitutes?

A: The 9250A-182-RC is ROHS3 compliant. The ER1641 series (all variants) is RoHS non-compliant. Selection depends on regulatory requirements for the end application.

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