Bourns 9250-561 Equivalent & Substitute Parts

Part Overview

The Bourns 9250-561 is a 560 nH shielded drum core wirewound inductor rated for 490 mA with a maximum DC resistance of 330 mOhm. This through-hole axial component operates across the temperature range of -55°C to 105°C and features a self-resonant frequency of 210 MHz. The part is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Inductance	560 nH
Tolerance	±10%
Current Rating	490 mA
DC Resistance (Max)	330 mOhm
Q @ 25 MHz	43
Self-Resonant Frequency	210 MHz
Shielding	Shielded
Operating Temperature	-55°C to 105°C
Mounting Type	Through Hole
Package	Axial
Size	0.162" Dia x 0.410" L (4.11 mm x 10.41 mm)

Substitute Part Grouping Explanation

Substitution for the Bourns 9250-561 is based on electrical and mechanical parameter equivalence. The following criteria determine compatibility:

Inductance value: 560 nH with ±10% tolerance
Current rating: 490 mA minimum
DC resistance: 330 mOhm maximum
Shielding: Shielded construction required
Self-resonant frequency: 210 MHz
Q factor: 43 @ 25 MHz
Operating temperature range: -55°C to 105°C
Physical form factor: Through-hole axial package
Dimensions: 0.162" Dia x 0.410" L (4.11 mm x 10.41 mm)

The API Delevan ER1641 series parts meet all specified electrical and mechanical parameters. These substitutes differ in core material (phenolic vs. ferrite) and construction type (molded vs. drum core), but maintain functional equivalence within the defined parameter set.

Parameter Comparison

Parameter	Bourns 9250-561	API Delevan ER1641-561KM	API Delevan ER1641-561KP	API Delevan ER1641-561KR	API Delevan ER1641-561KS
Inductance	560 nH	560 nH	560 nH	560 nH	560 nH
Tolerance	±10%	±10%	±10%	±10%	±10%
Current Rating (mA)	490	490	490	490	490
DC Resistance (Max)	330 mOhm	330 mOhm	330 mOhm	330 mOhm	330 mOhm
Q @ 25 MHz	43	43	43	43	43
Self-Resonant Frequency	210 MHz	210 MHz	210 MHz	210 MHz	210 MHz
Shielding	Shielded	Shielded	Shielded	Shielded	Shielded
Operating Temperature	-55°C to 105°C	-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	Through Hole
Package	Axial	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	0.162" Dia x 0.410" L
Product Status	Obsolete	Active	Active	Active	Active
Packaging	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

The API Delevan ER1641 series (ER1641-561KM, ER1641-561KP, ER1641-561KR, ER1641-561KS) provides direct functional substitution for the obsolete Bourns 9250-561. All substitute parts maintain active product status, ensuring long-term availability and supply chain continuity.

Both the main part and substitute parts carry identical RoHS non-compliance status and REACH unaffected classification. Compliance posture remains consistent across the substitution group.

The ER1641 series components are supplied in Tape & Reel packaging, which differs from the bulk packaging of the original part. This packaging format is standard for active production components and supports automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the API Delevan ER1641-561K series directly replace the Bourns 9250-561 in existing designs?

A: Yes. All electrical parameters, physical dimensions, and operating characteristics are equivalent. The components are pin-compatible and functionally interchangeable within the specified parameter set.

Q: What is the difference between the four ER1641 variants (KM, KP, KR, KS)?

A: The variants represent different packaging tape configurations or manufacturing batches within the ER1641-561 product line. All four variants maintain identical electrical and mechanical specifications.

Q: Does the change from drum core (ferrite) to molded (phenolic) construction affect circuit performance?

A: The substitute parts are specified to deliver equivalent electrical performance across all measured parameters: inductance, Q factor, self-resonant frequency, and DC resistance. The core material difference is internal to the component design and does not alter the functional characteristics within the defined parameter tolerance.

Q: Are there any compliance or certification differences between the main part and substitutes?

A: No. Both the Bourns 9250-561 and all API Delevan ER1641-561K variants share identical RoHS and REACH compliance status.

Q: What inventory levels are available for the substitute parts?

A: API Delevan ER1641-561KM: 877 pcs; ER1641-561KP: 1098 pcs; ER1641-561KR: 1087 pcs; ER1641-561KS: 1129 pcs. All are listed as new original stock.

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