Bourns 9250-121 120nH Shielded Drum Core Wirewound Inductor Equivalent & Substitute Parts

Part Overview

The Bourns 9250-121 is a 120 nH shielded drum core wirewound inductor rated for 1.53 A with a maximum DC resistance of 34 mOhm. This through-hole axial component operates across the temperature range of -55°C to 105°C and features a self-resonant frequency of 250 MHz. The part is classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Inductance	120 nH
Tolerance	±10%
Current Rating	1.53 A
DC Resistance (Max)	34 mOhm
Shielding	Shielded
Mounting Type	Through Hole
Package	Axial
Operating Temperature	-55°C to 105°C
Self-Resonant Frequency	250 MHz
Size	0.162" Dia x 0.410" L (4.11mm x 10.41mm)

Substitute Part Grouping Explanation

Substitution for the Bourns 9250-121 is based on strict electrical and mechanical parameter matching:

Critical Matching Parameters:

Inductance value: 120 nH with ±10% tolerance
Current rating: 1.53 A minimum
DC resistance: 34 mOhm maximum
Shielding: Shielded construction required
Mounting: Through-hole axial configuration
Physical dimensions: 0.162" Dia x 0.410" L (4.11mm x 10.41mm)
Operating temperature range: -55°C to 105°C
Self-resonant frequency: 250 MHz
Test frequency: 25 MHz

The API Delevan ER1641 series parts (ER1641-121KM, ER1641-121KP, ER1641-121KR) meet all specified electrical and mechanical parameters. These molded inductors provide equivalent performance characteristics with active product status, ensuring long-term availability.

Parameter Comparison

Parameter	Bourns 9250-121	API Delevan ER1641-121KM	API Delevan ER1641-121KP	API Delevan ER1641-121KR
Inductance	120 nH	120 nH	120 nH	120 nH
Tolerance	±10%	±10%	±10%	±10%
Current Rating (A)	1.53	1.53	1.53	1.53
DC Resistance (Max)	34 mOhm	34 mOhm	34 mOhm	34 mOhm
Shielding	Shielded	Shielded	Shielded	Shielded
Q @ 25 MHz	51	50	50	50
Self-Resonant Frequency	250 MHz	250 MHz	250 MHz	250 MHz
Operating Temperature	-55°C to 105°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
Package	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
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	Non-compliant	Non-compliant	Non-compliant
REACH Status	Unaffected	Unaffected	Unaffected	Unaffected

Engineering Selection Recommendations

The API Delevan ER1641 series inductors (ER1641-121KM, ER1641-121KP, ER1641-121KR) are direct functional equivalents to the obsolete Bourns 9250-121. All three variants maintain identical electrical specifications and physical dimensions, with the primary distinction being packaging format (Tape & Reel).

Selection among the three ER1641 variants should be based on procurement quantity requirements and supply chain availability. All three parts carry active product status, ensuring sustained manufacturing support and component availability. Compliance certifications (REACH Unaffected, ECCN EAR99, HTSUS 8504.50.8000) are consistent across all substitute options.

Frequently Asked Questions (FAQ)

Q: Can the API Delevan ER1641 series parts directly replace the Bourns 9250-121 in existing designs?

A: Yes. The ER1641-121KM, ER1641-121KP, and ER1641-121KR maintain identical inductance (120 nH), current rating (1.53 A), DC resistance (34 mOhm maximum), shielding, operating temperature range (-55°C to 105°C), and physical dimensions (0.162" Dia x 0.410" L). Through-hole axial mounting is preserved across all parts.

Q: What is the difference between ER1641-121KM, ER1641-121KP, and ER1641-121KR?

A: These three part numbers represent the same electrical and mechanical specifications. The differentiation is in packaging format, with all three supplied in Tape & Reel (TR) configuration. Selection should be based on procurement volume and inventory management requirements.

Q: Are there any performance differences between the Bourns 9250-121 and the API Delevan ER1641 substitutes?

A: The Q factor at 25 MHz differs slightly: Bourns 9250-121 specifies Q of 51, while the ER1641 series specifies Q of 50. This represents a negligible performance variance for most applications. All other electrical parameters, including inductance, current rating, DC resistance, and self-resonant frequency, are identical.

Q: What is the core material difference between these parts?

A: The Bourns 9250-121 uses a ferrite drum core, while the API Delevan ER1641 series uses a phenolic core. Both constructions achieve the specified electrical performance and shielding requirements for this inductance value and current rating.

Q: Are these parts RoHS compliant?

A: No. Both the Bourns 9250-121 and all API Delevan ER1641 variants are classified as RoHS non-compliant. REACH status is Unaffected for all parts.

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