Bourns 9250-122 Equivalent & Substitute Parts

Part Overview

The Bourns 9250-122 is a 1.2 µH shielded drum core wirewound inductor rated for 895 mA with a maximum DC resistance of 100 mOhm. This through-hole axial component operates across -55°C to 105°C and features ferrite core construction with ±10% inductance tolerance. The part is currently obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Inductance	1.2 µH
Inductance Tolerance	±10%
Current Rating	895 mA
DC Resistance (Max)	100 mOhm
Shielding	Shielded
Core Material	Ferrite
Q Factor @ 7.9 MHz	44
Self Resonant Frequency	130 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 is determined by matching the following critical parameters: inductance value (1.2 µH), inductance tolerance (±10%), current rating (895 mA), DC resistance (100 mOhm maximum), shielding (shielded), mounting type (through hole), package style (axial), and physical dimensions (0.162" Dia x 0.410" L). All identified substitutes meet these electrical and mechanical specifications. Core material variation (ferrite versus iron) and product status differences are noted but do not preclude functional equivalence within the specified parameter envelope.

Parameter Comparison

Parameter	9250-122 (Bourns)	9250A-122-RC (Bourns)	ER1641-122KM (API Delevan)	ER1641-122KP (API Delevan)	ER1641-122KR (API Delevan)
Inductance	1.2 µH	1.2 µH	1.2 µH	1.2 µH	1.2 µH
Inductance Tolerance	±10%	±10%	±10%	±10%	±10%
Current Rating (Amps)	895 mA	895 mA	895 mA	895 mA	895 mA
DC Resistance (Max)	100 mOhm	100 mOhm	100 mOhm	100 mOhm	100 mOhm
Shielding	Shielded	Shielded	Shielded	Shielded	Shielded
Q @ 7.9 MHz	44	44	44	44	44
Self Resonant Frequency	130 MHz	130 MHz	130 MHz	130 MHz	130 MHz
Operating Temperature Range	-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 / Case	Axial	Axial	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)	0.162" Dia x 0.410" L (4.11mm x 10.41mm)	0.162" Dia x 0.410" L (4.11mm x 10.41mm)	0.162" Dia x 0.410" L (4.11mm x 10.41mm)
Core Material	Ferrite	Ferrite	Iron	Iron	Iron
Type	Drum Core, Wirewound	Molded	Molded	Molded	Molded
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant

Engineering Selection Recommendations

The Bourns 9250A-122-RC is the primary direct substitute, offering identical electrical specifications with extended operating temperature range (-55°C to 125°C) and active product status. This part is ROHS3 compliant and available in bulk packaging, making it suitable for new designs and production transitions from the obsolete 9250-122.

The API Delevan ER1641 series (ER1641-122KM, ER1641-122KP, ER1641-122KR) provides functional equivalence across all critical electrical parameters. These parts are active products available in tape and reel packaging. Core material differs (iron versus ferrite), and these parts are RoHS non-compliant. Selection among the three ER1641 variants should be based on packaging requirements and inventory availability.

For applications requiring RoHS3 compliance, the Bourns 9250A-122-RC is the only compliant option among the identified substitutes.

Frequently Asked Questions (FAQ)

Q: Can the Bourns 9250A-122-RC directly replace the obsolete 9250-122?

A: Yes. The 9250A-122-RC matches all critical electrical parameters: 1.2 µH inductance, 895 mA current rating, 100 mOhm maximum DC resistance, shielded construction, and identical physical dimensions. The extended operating temperature range (-55°C to 125°C versus -55°C to 105°C) provides additional margin. Mounting and package compatibility are identical.

Q: What is the difference between the Bourns and API Delevan substitutes?

A: The Bourns 9250A-122-RC uses ferrite core material and is ROHS3 compliant. The API Delevan ER1641 series uses iron core material and is RoHS non-compliant. All parts meet the specified electrical performance envelope. Packaging differs: 9250A-122-RC is supplied in bulk; ER1641 variants are supplied in tape and reel.

Q: Are there differences among the three ER1641 variants?

A: The ER1641-122KM, ER1641-122KP, and ER1641-122KR are electrically identical. Differences relate to packaging configuration and supplier logistics. Selection should be based on procurement requirements and inventory availability.

Q: Does core material (ferrite versus iron) affect circuit performance?

A: Both ferrite and iron core materials deliver the specified electrical parameters: 1.2 µH inductance, 44 Q factor at 7.9 MHz, and 130 MHz self-resonant frequency. Core material selection is an engineering trade-off determined by application-specific requirements beyond the scope of this substitution analysis.

Q: What packaging options are available?

A: The Bourns 9250A-122-RC is supplied in bulk packaging. The API Delevan ER1641 series is supplied in tape and reel (TR) packaging. Through-hole axial package and physical dimensions are identical across all substitutes.

Q: Is RoHS compliance a requirement for my application?

A: If RoHS3 compliance is mandatory, the Bourns 9250A-122-RC is the only compliant option. The original 9250-122 and all API Delevan ER1641 variants are RoHS non-compliant.

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