Bourns 9250-155 Equivalent & Substitute Parts

Part Overview

The Bourns 9250-155 is a 1.5 mH shielded drum core wirewound inductor rated for 55 mA with a maximum DC resistance of 26.5 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 9250-155 has reached obsolete product status. 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	1.5 mH
Tolerance	±10%
Current Rating	55 mA
DC Resistance (Max)	26.5 Ohm
Shielding	Shielded
Core Material	Ferrite
Mounting Type	Through Hole
Package	Axial
Operating Temperature	-55°C to 105°C
Q @ 250 kHz	45
Self Resonant Frequency	1.2 MHz

Substitute Part Grouping Explanation

Substitute parts for the 9250-155 are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Inductance value: 1.5 mH
Tolerance: ±10%
DC Resistance: 26.5 Ohm maximum
Shielding: Shielded
Core Material: Ferrite
Mounting Type: Through Hole
Package: Axial

Secondary Considerations:

Current rating must meet or exceed the application requirement
Operating temperature range must cover the intended application environment
Self-resonant frequency and Q factor must be compatible with circuit operation

Substitute parts are classified as direct equivalents when all primary criteria are met with identical or superior electrical performance. Parts with higher current ratings or extended temperature ranges are suitable for applications where the original part's specifications are within acceptable margins.

Parameter Comparison

Parameter	9250-155 (Main)	9250A-155-RC (Direct)	4307-155K (Similar)
Manufacturer	Bourns Inc.	Bourns Inc.	API Delevan Inc.
Inductance	1.5 mH	1.5 mH	1.5 mH
Tolerance	±10%	±10%	±10%
Current Rating (Amps)	55 mA	55 mA	110 mA
Current - Saturation (Isat)	33 mA	33 mA	33 mA
DC Resistance (Max)	26.5 Ohm	26.5 Ohm	26.5 Ohm
Shielding	Shielded	Shielded	Shielded
Core Material	Ferrite	Ferrite	Ferrite
Q @ 250 kHz	45	45	50
Self Resonant Frequency	1.2 MHz	1.2 MHz	2.8 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
Type	Drum Core, Wirewound	Molded	Molded
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	RoHS3 Compliant	RoHS non-compliant
Packaging	-	Bulk	Tape & Reel (TR)

Engineering Selection Recommendations

Bourns 9250A-155-RC is the primary direct substitute for the obsolete 9250-155. This part maintains identical electrical specifications including inductance, tolerance, current rating, and DC resistance. The 9250A-155-RC is manufactured by the same supplier (Bourns Inc.) and offers improved product status as an active component. The extended operating temperature range (-55°C to 125°C versus -55°C to 105°C) provides additional thermal margin. RoHS3 compliance of the 9250A-155-RC addresses regulatory requirements not met by the original part.

API Delevan 4307-155K is a suitable alternative when higher current capacity is required. This part doubles the current rating to 110 mA while maintaining the same inductance, tolerance, and DC resistance specifications. The 4307-155K exhibits superior Q factor (50 versus 45 at 250 kHz) and higher self-resonant frequency (2.8 MHz versus 1.2 MHz), making it suitable for higher-frequency applications. The extended operating temperature range (-55°C to 125°C) matches the 9250A-155-RC. Physical dimensions differ slightly (0.197" diameter × 0.447" length versus 0.162" diameter × 0.410" length), requiring verification of board layout compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 9250A-155-RC be used as a direct replacement for the 9250-155?

A: Yes. The 9250A-155-RC meets all primary electrical specifications of the 9250-155, including inductance, tolerance, current rating, and DC resistance. The primary differences are construction type (molded versus drum core wirewound), extended temperature range, and improved RoHS compliance. No circuit redesign is required.

Q: What are the physical differences between these parts?

A: The 9250-155 and 9250A-155-RC share identical dimensions (0.162" diameter × 0.410" length). The 4307-155K has larger dimensions (0.197" diameter × 0.447" length) and requires board layout verification before substitution.

Q: When should the 4307-155K be selected over the 9250A-155-RC?

A: The 4307-155K is appropriate when the application requires higher current capacity (110 mA versus 55 mA) or operates at higher frequencies where the superior self-resonant frequency (2.8 MHz) provides better performance. Board space constraints must be evaluated due to larger physical dimensions.

Q: Are there compliance differences between these parts?

A: The 9250A-155-RC is RoHS3 compliant, while both the original 9250-155 and the 4307-155K are RoHS non-compliant. For applications subject to RoHS requirements, the 9250A-155-RC is the appropriate selection.

Q: What packaging options are available?

A: The 9250A-155-RC is supplied in bulk packaging. The 4307-155K is supplied in Tape & Reel (TR) format, suitable for automated assembly processes.

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