Bourns 9250-125 Equivalent & Substitute Parts

Part Overview

The Bourns 9250-125 is a 1.2 mH shielded drum core wirewound inductor rated for 60 mA with a maximum DC resistance of 22.1 Ohm. This through-hole axial component operates across a temperature range of -55°C to 105°C and is designed for applications requiring fixed inductance with ferrite core shielding.

The 9250-125 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for production and repair applications.

Key Parameters

Parameter	Value
Inductance	1.2 mH
Tolerance	±10%
Current Rating	60 mA
DC Resistance (Max)	22.1 Ohm
Shielding	Shielded
Core Material	Ferrite
Mounting Type	Through Hole
Package	Axial
Operating Temperature	-55°C to 105°C

Substitute Part Grouping Explanation

Substitution for the Bourns 9250-125 is determined by matching the following critical parameters:

Inductance value: 1.2 mH
Tolerance: ±10%
DC Resistance: 22.1 Ohm maximum
Shielding: Shielded
Core material: Ferrite
Mounting type: Through hole axial
Operating temperature range compatibility

Two substitute parts meet these criteria with varying degrees of parameter alignment. The Bourns 9250A-125-RC provides a direct replacement with identical electrical specifications and improved product status. The API Delevan 4307-125K offers higher current rating capability while maintaining core electrical parameters.

Parameter Comparison

Parameter	9250-125 (Main)	9250A-125-RC (Direct)	4307-125K (Similar)
Manufacturer	Bourns Inc.	Bourns Inc.	API Delevan Inc.
Inductance	1.2 mH	1.2 mH	1.2 mH
Tolerance	±10%	±10%	±10%
Current Rating	60 mA	60 mA	115 mA
Current - Saturation	35 mA	35 mA	35 mA
DC Resistance (Max)	22.1 Ohm	22.1 Ohm	22.1 Ohm
Q @ 250 kHz	45	45	50
Frequency - Self Resonant	1.5 MHz	1.5 MHz	3 MHz
Shielding	Shielded	Shielded	Shielded
Core Type	Drum Core, Wirewound	Molded	Molded
Operating Temperature	-55°C to 105°C	-55°C to 125°C	-55°C to 125°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	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)	0.197" Dia x 0.447" L (5.00mm x 11.35mm)
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	RoHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

The Bourns 9250A-125-RC is the primary substitute for the obsolete 9250-125. Both parts are manufactured by Bourns Inc. and share identical electrical specifications, inductance value, tolerance, current rating, DC resistance, and self-resonant frequency. The 9250A-125-RC maintains the same physical dimensions and axial through-hole mounting configuration. The substitute offers extended operating temperature range (-55°C to 125°C versus -55°C to 105°C) and RoHS3 compliance, making it suitable for modern production environments.

The API Delevan 4307-125K provides an alternative substitute with higher current rating capability (115 mA versus 60 mA) and improved self-resonant frequency (3 MHz versus 1.5 MHz). This part maintains identical inductance, tolerance, and DC resistance specifications. Physical dimensions differ slightly (0.197" diameter versus 0.162" diameter), requiring PCB layout verification. The 4307-125K is suitable for applications where higher current capacity or improved high-frequency performance is beneficial.

Selection between the two substitutes depends on application requirements. Use the 9250A-125-RC for direct replacement with minimal design changes and RoHS compliance. Use the 4307-125K when higher current rating or extended frequency response is required, with consideration for physical dimension differences.

Frequently Asked Questions (FAQ)

Q: Can the 9250A-125-RC be used as a direct replacement for the 9250-125?

A: Yes. The 9250A-125-RC matches all critical electrical parameters: 1.2 mH inductance, ±10% tolerance, 60 mA current rating, 22.1 Ohm maximum DC resistance, and shielded ferrite core construction. Physical dimensions and axial through-hole mounting are identical. The primary differences are product status (active versus obsolete), extended operating temperature range, and RoHS3 compliance.

Q: What are the key differences between the 9250A-125-RC and 4307-125K?

A: Both substitutes maintain 1.2 mH inductance and 22.1 Ohm DC resistance. The 9250A-125-RC is a Bourns product with identical current rating (60 mA) and physical dimensions to the original part. The 4307-125K is an API Delevan product with higher current rating (115 mA), improved self-resonant frequency (3 MHz), and slightly larger physical dimensions (0.197" diameter versus 0.162" diameter).

Q: Are there physical dimension constraints when substituting with the 4307-125K?

A: Yes. The 4307-125K has a larger diameter (0.197" versus 0.162") and slightly longer length (0.447" versus 0.410"). PCB layout and component spacing must be verified before substitution to ensure mechanical compatibility.

Q: Which substitute is recommended for new designs?

A: The 9250A-125-RC is recommended for designs requiring direct replacement of the obsolete 9250-125. It provides active product status, RoHS3 compliance, and identical electrical and physical specifications. The 4307-125K is suitable when higher current capacity or improved frequency response is required.

Q: Do the substitutes maintain the same shielding characteristics?

A: Yes. Both the 9250A-125-RC and 4307-125K are shielded inductors with ferrite cores, maintaining the same shielding approach as the original 9250-125.

Q: What is the impact of the extended operating temperature range in the 9250A-125-RC?

A: The 9250A-125-RC operates from -55°C to 125°C compared to the original -55°C to 105°C. This extended upper temperature limit provides additional thermal margin and is beneficial for applications in high-temperature environments.

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