Bourns 9250-124 Equivalent & Substitute Parts

Part Overview

The Bourns 9250-124 is a 120 µH shielded drum core wirewound inductor rated for 150 mA with a maximum DC resistance of 3.6Ohm. This through-hole axial component operates across -55°C to 105°C and features ferrite core construction with ±10% inductance tolerance. The part is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Inductance	120 µH
Current Rating	150 mA
DC Resistance (Max)	3.6Ohm
Tolerance	±10%
Core Material	Ferrite
Shielding	Shielded
Mounting Type	Through Hole
Package	Axial
Size	0.162" Dia x 0.410" L (4.11mm x 10.41mm)
Operating Temperature	-55°C ~ 105°C

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching the following critical parameters: inductance value (120 µH), current rating (150 mA), DC resistance (3.6Ohm max), tolerance (±10%), core material (ferrite), mounting type (through hole), and package format (axial). Shielding configuration is a secondary consideration that may vary based on application requirements.

The substitute parts are grouped into two categories:

Direct Manufacturer Substitute: Parts from Bourns Inc. that maintain identical electrical specifications and form factor while offering improved product status or compliance.

Cross-Manufacturer Equivalents: Parts from API Delevan Inc. that match all critical electrical parameters and physical dimensions, with variations in shielding configuration and compliance certifications.

Parameter Comparison

Parameter	9250-124	9250A-124-RC	ER1641-124KM	ER1641-124KP	ER1641-124KR
Manufacturer	Bourns Inc.	Bourns Inc.	API Delevan Inc.	API Delevan Inc.	API Delevan Inc.
Inductance	120 µH	120 µH	120 µH	120 µH	120 µH
Current Rating	150 mA	150 mA	150 mA	150 mA	150 mA
DC Resistance (Max)	3.6Ohm	3.6Ohm	3.6Ohm	3.6Ohm	3.6Ohm
Tolerance	±10%	±10%	±10%	±10%	±10%
Q @ 790kHz	55	55	55	55	55
Self Resonant Frequency	9.7MHz	9.7MHz	9.7MHz	9.7MHz	9.7MHz
Core Material	Ferrite	Ferrite	Ferrite	Ferrite	Ferrite
Shielding	Shielded	Shielded	Shielded	Shielded	Unshielded
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
Operating Temperature	-55°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant
Packaging Format	-	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

Bourns 9250A-124-RC is the primary direct substitute for the obsolete 9250-124. Both parts are manufactured by Bourns Inc. and maintain identical electrical specifications. The 9250A-124-RC offers active product status, extended operating temperature range (-55°C to 125°C versus -55°C to 105°C), and ROHS3 compliance, making it suitable for applications requiring regulatory adherence. The molded construction replaces the original drum core design while preserving all critical electrical parameters.

API Delevan ER1641-124KM and ER1641-124KP are cross-manufacturer equivalents with active product status and identical electrical performance. Both feature shielded molded construction and are supplied in Tape & Reel packaging. These parts are suitable for high-volume production environments where tape and reel format is preferred.

API Delevan ER1641-124KR matches all electrical specifications but features unshielded construction. This variant is qualified to MIL-PRF-39010/03 military standards. Selection of this part requires confirmation that shielding is not a functional requirement in the target application.

Frequently Asked Questions (FAQ)

Q: Can the 9250A-124-RC directly replace the obsolete 9250-124?

A: Yes. The 9250A-124-RC maintains all critical electrical parameters: 120 µH inductance, 150 mA current rating, 3.6Ohm maximum DC resistance, ±10% tolerance, ferrite core, shielded configuration, and identical physical dimensions. The extended operating temperature range and ROHS3 compliance provide additional benefits for modern applications.

Q: What is the difference between shielded and unshielded variants?

A: The ER1641-124KR is unshielded, while the 9250-124, 9250A-124-RC, ER1641-124KM, and ER1641-124KP are shielded. Shielding reduces electromagnetic interference. Selection depends on whether EMI suppression is required in the circuit design.

Q: Are the API Delevan parts electrically equivalent to the Bourns parts?

A: Yes. The ER1641 series parts match all specified electrical parameters: inductance, current rating, DC resistance, tolerance, Q factor, and self-resonant frequency. Physical dimensions and mounting characteristics are identical.

Q: What packaging formats are available?

A: The 9250A-124-RC is supplied in bulk packaging. The ER1641-124KM, ER1641-124KP, and ER1641-124KR are supplied in Tape & Reel format, which is standard for automated assembly processes.

Q: Does RoHS compliance affect electrical performance?

A: No. RoHS compliance is a material composition requirement that does not alter electrical specifications. The ROHS3-compliant 9250A-124-RC delivers identical electrical performance to the non-compliant 9250-124.

Q: Can the ER1641-124KR unshielded variant be used in place of shielded parts?

A: Only if the application does not require electromagnetic shielding. Unshielded inductors may introduce or be susceptible to EMI in sensitive circuits. Circuit design review is necessary to confirm compatibility.

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