Equivalent & Substitute Parts for Bourns 9250-181-RC

Part Overview

The Bourns 9250-181-RC 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 a temperature range of -55°C to 105°C and is designed for applications requiring low inductance values with controlled impedance characteristics at high frequencies.

The 9250-181-RC has reached obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for legacy systems or new designs requiring identical electrical performance.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution eligibility for the 9250-181-RC is determined by strict equivalence across the following critical parameters:

Inductance Value: 180 nH ±10%
Current Rating: 1.3 A minimum
DC Resistance: 47 mOhm maximum
Shielding: Shielded configuration required
Frequency Response: Q factor of 50 @ 25 MHz and self-resonant frequency of 250 MHz
Mounting and Package: Through-hole axial configuration with identical physical dimensions (0.162" Dia x 0.410" L)
Operating Temperature: Minimum -55°C to 105°C range

Substitute parts are grouped into two categories:

Direct Manufacturer Substitute: Parts from the same manufacturer (Bourns Inc.) that maintain identical electrical specifications and physical form factor.

Similar Manufacturer Substitutes: Parts from alternative manufacturers (API Delevan Inc.) that meet all electrical and mechanical requirements but may differ in core material composition and compliance certifications.

Parameter Comparison

Parameter	9250-181-RC (Main)	9250A-181-RC	ER1641-181KM	ER1641-181KP	ER1641-181KR
Manufacturer	Bourns Inc.	Bourns Inc.	API Delevan Inc.	API Delevan Inc.	API Delevan Inc.
Inductance	180 nH	180 nH	180 nH	180 nH	180 nH
Tolerance	±10%	±10%	±10%	±10%	±10%
Current Rating (A)	1.3	1.3	1.3	1.3	1.3
DC Resistance (Max)	47 mOhm	47 mOhm	47 mOhm	47 mOhm	47 mOhm
Q @ 25 MHz	50	50	50	50	50
Self Resonant Frequency	250 MHz	250 MHz	250 MHz	250 MHz	250 MHz
Shielding	Shielded	Shielded	Shielded	Shielded	Shielded
Operating Temperature	-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
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package	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-181-RC is the recommended direct substitute. This part maintains identical electrical specifications and physical dimensions while offering an extended operating temperature range of -55°C to 125°C. The 9250A-181-RC carries active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment.

Alternative Substitutes: The API Delevan ER1641 series (ER1641-181KM, ER1641-181KP, ER1641-181KR) provides electrical equivalence across all critical parameters. These parts are active products with confirmed inventory availability. However, these alternatives are RoHS non-compliant and feature phenolic core material instead of ferrite. Selection of API Delevan parts is appropriate only when RoHS compliance is not a design requirement and phenolic core characteristics are acceptable for the application.

Compliance Considerations: Applications requiring ROHS3 compliance must use either the 9250-181-RC (if legacy stock is available) or the 9250A-181-RC. The API Delevan ER1641 series is unsuitable for designs with mandatory RoHS compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can the 9250A-181-RC be used as a direct replacement for the 9250-181-RC?

A: Yes. The 9250A-181-RC is electrically and mechanically equivalent to the 9250-181-RC across all critical parameters: inductance, current rating, DC resistance, frequency response, and physical dimensions. The primary difference is product status (active vs. obsolete) and an extended upper operating temperature limit (125°C vs. 105°C), which provides additional design margin.

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

A: Both meet identical electrical specifications for inductance, current rating, DC resistance, and frequency response. The key differences are: (1) core material composition (ferrite vs. phenolic), (2) RoHS compliance status (ROHS3 compliant vs. non-compliant), and (3) manufacturer. The ER1641 series is suitable only when RoHS compliance is not required.

Q: Are the ER1641-181KM, ER1641-181KP, and ER1641-181KR interchangeable?

A: Yes. All three API Delevan variants meet identical electrical and mechanical specifications. The suffix designations (KM, KP, KR) indicate packaging or internal configuration differences that do not affect electrical performance or physical form factor. Selection among these variants depends on packaging availability and supplier inventory.

Q: What packaging formats are available for substitute parts?

A: The Bourns 9250A-181-RC is supplied in bulk packaging. The API Delevan ER1641 series (all variants) is supplied in Tape & Reel (TR) format. Both packaging formats are compatible with standard through-hole assembly processes.

Q: Can I use an ER1641 series part in a design that requires RoHS compliance?

A: No. The ER1641 series is RoHS non-compliant and cannot be used in applications with mandatory RoHS compliance requirements. Use the Bourns 9250A-181-RC for RoHS-compliant designs.

Q: What is the inventory status for each substitute part?

A: Current inventory levels are: 9250A-181-RC (1747 pcs), ER1641-181KM (968 pcs), ER1641-181KP (1093 pcs), and ER1641-181KR (835 pcs). All parts are available as new original stock.

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