Equivalent & Substitute Parts for Bourns 9250-105-RC

Part Overview

The Bourns 9250-105-RC is a 1 mH shielded drum core wirewound inductor rated for 70 mA with a maximum DC resistance of 17.5 Ohm. This through-hole axial component operates across -55°C to 105°C and is designed for applications requiring electromagnetic shielding in compact form factors. The 9250-105-RC is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Inductance	1 mH
Inductance Tolerance	±10%
Current Rating	70 mA
DC Resistance (Max)	17.5 Ohm
Shielding	Shielded
Core Material	Ferrite
Q @ Frequency	60 @ 790 kHz
Self Resonant Frequency	3.8 MHz
Operating Temperature Range	-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 9250-105-RC is determined by strict equivalence across the following critical parameters: inductance value (1 mH), inductance tolerance (±10%), current rating (70 mA), DC resistance (17.5 Ohm maximum), core material (ferrite), shielding configuration, Q factor (60 @ 790 kHz), self-resonant frequency (3.8 MHz), mounting type (through hole), and package form (axial). Physical dimensions must match within the specified tolerance of 0.162" diameter by 0.410" length.

The substitute parts are grouped into two categories:

Direct Equivalent: The Bourns 9250A-105-RC maintains identical electrical specifications and physical dimensions as the main part, with the distinction of being an active product in molded construction rather than drum core construction. This part is the primary replacement for obsolete stock.

Similar Equivalents: The API Delevan ER1641 series (ER1641-105KM, ER1641-105KP, ER1641-105KR) meets all electrical and mechanical parameters. These parts differ in shielding configuration (ER1641-105KR is unshielded) and regulatory compliance status.

Parameter Comparison

Parameter	9250-105-RC (Main)	9250A-105-RC	ER1641-105KM	ER1641-105KP	ER1641-105KR
Manufacturer	Bourns Inc.	Bourns Inc.	API Delevan Inc.	API Delevan Inc.	API Delevan Inc.
Inductance	1 mH	1 mH	1 mH	1 mH	1 mH
Tolerance	±10%	±10%	±10%	±10%	±10%
Current Rating	70 mA	70 mA	70 mA	70 mA	70 mA
DC Resistance (Max)	17.5 Ohm	17.5 Ohm	17.5 Ohm	17.5 Ohm	17.5 Ohm
Q @ 790 kHz	60	60	60	60	60
Self Resonant Frequency	3.8 MHz	3.8 MHz	3.8 MHz	3.8 MHz	3.8 MHz
Shielding	Shielded	Shielded	Shielded	Shielded	Unshielded
Core Material	Ferrite	Ferrite	Ferrite	Ferrite	Ferrite
Operating Temperature	-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	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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Non-Compliant	RoHS Non-Compliant	RoHS Non-Compliant

Engineering Selection Recommendations

Primary Substitute: The Bourns 9250A-105-RC is the recommended direct replacement for the obsolete 9250-105-RC. Both parts are manufactured by Bourns Inc., maintain identical electrical specifications and physical dimensions, and the 9250A-105-RC is currently in active production status. The 9250A-105-RC offers an extended operating temperature range to 125°C compared to the original 105°C maximum. Both parts are ROHS3 compliant.

Alternative Substitutes: The API Delevan ER1641-105KM and ER1641-105KP are electrically and mechanically equivalent to the main part and are active products. These parts are suitable for applications where RoHS compliance is not required. Selection between ER1641-105KM and ER1641-105KP should be based on packaging requirements (both are supplied in Tape & Reel format).

Conditional Substitute: The API Delevan ER1641-105KR is electrically equivalent but features an unshielded construction. This part is suitable only for applications where electromagnetic shielding is not a functional requirement. The ER1641-105KR is qualified to MIL-PRF-39010/03 military specifications.

Frequently Asked Questions (FAQ)

Q: Can the 9250A-105-RC be used as a direct replacement for the 9250-105-RC?

A: Yes. The 9250A-105-RC maintains all critical electrical parameters (1 mH inductance, 70 mA current rating, 17.5 Ohm DC resistance, 60 Q @ 790 kHz) and physical dimensions (0.162" diameter x 0.410" length) required for direct substitution. The primary difference is construction type (molded versus drum core) and extended temperature rating to 125°C.

Q: What is the difference between shielded and unshielded variants?

A: The 9250-105-RC, 9250A-105-RC, ER1641-105KM, and ER1641-105KP are shielded inductors, providing electromagnetic containment. The ER1641-105KR is unshielded and must be used only in applications where shielding is not functionally required. Shielding affects electromagnetic interference characteristics and board layout considerations.

Q: Are the API Delevan ER1641 series parts suitable for new designs?

A: The ER1641-105KM and ER1641-105KP are active products suitable for new designs. However, these parts are RoHS non-compliant, which may restrict use in applications requiring RoHS certification. The Bourns 9250A-105-RC is the preferred choice for new designs requiring RoHS3 compliance.

Q: What packaging options are available?

A: The Bourns 9250-105-RC and 9250A-105-RC are supplied in bulk packaging. The API Delevan ER1641 series (ER1641-105KM, ER1641-105KP, ER1641-105KR) are supplied in Tape & Reel format. Packaging selection depends on production volume and assembly process requirements.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes, all substitute parts share identical axial through-hole mounting and physical dimensions (0.162" diameter x 0.410" length), allowing direct PCB footprint compatibility. Electrical performance is equivalent across all shielded variants at the specified operating parameters.

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