Bourns 9250-225 Equivalent & Substitute Parts

Part Overview

The Bourns 9250-225 is a 2.2 mH shielded drum core wirewound inductor rated for 50 mA with a maximum DC resistance of 33.8 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 9250-225 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	2.2 mH
Tolerance	±10%
Current Rating	50 mA
DC Resistance (Max)	33.8 Ohm
Shielding	Shielded
Core Material	Ferrite
Mounting Type	Through Hole
Package	Axial
Operating Temperature	-55°C to 105°C

Substitute Part Grouping Explanation

Substitute parts for the 9250-225 are identified based on the following critical parameters:

Inductance value: 2.2 mH (exact match required)
Tolerance: ±10% (exact match required)
DC Resistance: 33.8 Ohm maximum (exact match required)
Shielding: Shielded (required)
Core Material: Ferrite (required)
Mounting Type: Through Hole (required)
Package: Axial (required)
Current Rating: Minimum 50 mA (equal or greater acceptable)

The substitute parts listed below meet these electrical and mechanical criteria and are suitable for direct replacement in applications where the 9250-225 was originally specified.

Parameter Comparison

Parameter	9250-225	9250A-225-RC	4307-225K
Manufacturer	Bourns Inc.	Bourns Inc.	API Delevan Inc.
Series	9250	9250A	4307
Inductance	2.2 mH	2.2 mH	2.2 mH
Tolerance	±10%	±10%	±10%
Current Rating (Amps)	50 mA	50 mA	99 mA
Current - Saturation (Isat)	27 mA	27 mA	27 mA
DC Resistance (Max)	33.8 Ohm	33.8 Ohm	33.8 Ohm
Shielding	Shielded	Shielded	Shielded
Core Material	Ferrite	Ferrite	Ferrite
Q @ Freq	45 @ 250kHz	45 @ 250kHz	50 @ 250kHz
Frequency - Self Resonant	970 kHz	970 kHz	2.4 MHz
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-225-RC is the primary direct substitute for the obsolete 9250-225. Both components are manufactured by Bourns Inc., share identical electrical specifications, and maintain the same physical dimensions. The 9250A-225-RC is classified as active product status and meets ROHS3 compliance requirements, making it suitable for new designs and production environments with regulatory compliance mandates.

The API Delevan 4307-225K provides an alternative substitute with higher current rating capability (99 mA versus 50 mA) and extended upper operating temperature limit (125°C versus 105°C). Physical dimensions differ slightly, requiring PCB layout verification. This component is suitable for applications where increased current headroom or higher temperature operation is beneficial.

Selection between the two substitutes depends on compliance requirements, available inventory, and physical space constraints on the target PCB.

Frequently Asked Questions (FAQ)

Q: Can the 9250A-225-RC be used as a direct replacement for the 9250-225?

A: Yes. The 9250A-225-RC meets all electrical and mechanical specifications of the 9250-225, including inductance, tolerance, DC resistance, current rating, and physical dimensions. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 compliant versus non-compliant).

Q: What are the physical dimension differences between the 9250-225 and 4307-225K?

A: The 9250-225 measures 0.162" diameter by 0.410" length (4.11mm x 10.41mm). The 4307-225K measures 0.197" diameter by 0.447" length (5.00mm x 11.35mm). The larger dimensions of the 4307-225K require verification of available PCB space before substitution.

Q: Is the 4307-225K suitable for applications originally designed for the 9250-225?

A: The 4307-225K meets all critical electrical parameters (inductance, tolerance, DC resistance, shielding, core material) required for substitution. However, the increased physical dimensions and different self-resonant frequency (2.4 MHz versus 970 kHz) must be evaluated against specific application requirements.

Q: What is the current rating difference between the 9250-225 and 4307-225K?

A: The 9250-225 is rated for 50 mA maximum current. The 4307-225K is rated for 99 mA maximum current. Both components share the same saturation current (27 mA) and DC resistance specifications. The higher current rating of the 4307-225K provides additional design margin in current-limited applications.

Q: Are there packaging differences between these substitutes?

A: The 9250-225 and 9250A-225-RC are supplied in equivalent through-hole axial packages. The 4307-225K is supplied in Tape & Reel (TR) packaging, which may affect procurement and assembly processes.

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