Equivalent & Substitute Parts for Bourns 9250-274-RC

Part Overview

The Bourns 9250-274-RC is a 270 µH shielded drum core wirewound inductor rated for 115 mA with a maximum DC resistance of 5.8 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 9250-274-RC has reached obsolete product status. Identifying equivalent substitute parts ensures design continuity and supply chain reliability for existing applications and new production runs requiring compatible inductance characteristics.

Key Parameters

Parameter	Value
Inductance	270 µH
Tolerance	±10%
Current Rating	115 mA
DC Resistance (Max)	5.8 Ohm
Shielding	Shielded
Core Material	Ferrite
Q @ Frequency	55 @ 790 kHz
Self Resonant Frequency	7 MHz
Mounting Type	Through Hole
Package	Axial
Size	0.162" Dia x 0.410" L (4.11 mm x 10.41 mm)
Operating Temperature	-55°C to 105°C

Substitute Part Grouping Explanation

Substitute parts for the 9250-274-RC are qualified based on the following electrical and mechanical parameters:

Inductance value: 270 µH with ±10% tolerance
Current rating: 115 mA minimum
DC resistance: 5.8 Ohm maximum
Shielding: Shielded configuration
Core material: Ferrite
Q factor: 55 @ 790 kHz
Self resonant frequency: 7 MHz
Mounting: Through hole axial package
Physical dimensions: 0.162" Dia x 0.410" L (4.11 mm x 10.41 mm)

Substitutes are grouped into two categories: direct manufacturer alternatives from Bourns Inc. and equivalent parts from API Delevan Inc. that meet identical electrical specifications and physical form factors.

Parameter Comparison

Part Number	Manufacturer	Type	Inductance	Current Rating	DCR (Max)	Q @ 790 kHz	Temp Range	Status	RoHS
9250-274-RC	Bourns Inc.	Drum Core, Wirewound	270 µH	115 mA	5.8 Ohm	55	-55°C to 105°C	Obsolete	ROHS3 Compliant
9250A-274-RC	Bourns Inc.	Molded	270 µH	115 mA	5.8 Ohm	55	-55°C to 125°C	Active	ROHS3 Compliant
ER1641-274KM	API Delevan Inc.	Molded	270 µH	115 mA	5.8 Ohm	55	-55°C to 105°C	Active	RoHS Non-compliant
ER1641-274KP	API Delevan Inc.	Molded	270 µH	115 mA	5.8 Ohm	55	-55°C to 105°C	Active	RoHS Non-compliant
ER1641-274KR	API Delevan Inc.	Molded	270 µH	115 mA	5.8 Ohm	55	-55°C to 105°C	Active	RoHS Non-compliant

Engineering Selection Recommendations

The 9250A-274-RC from Bourns Inc. is the primary direct substitute for the obsolete 9250-274-RC. Both parts maintain identical electrical specifications and physical dimensions. The 9250A-274-RC offers an extended operating temperature range (-55°C to 125°C versus -55°C to 105°C) and maintains ROHS3 compliance, making it suitable for applications with stricter regulatory requirements.

The ER1641 series inductors from API Delevan Inc. (ER1641-274KM, ER1641-274KP, ER1641-274KR) provide electrical equivalence with matching inductance, current rating, DC resistance, and Q factor specifications. These parts are available in active production status. However, the ER1641 series carries RoHS non-compliant status, which may restrict use in applications subject to RoHS directives or customer specifications requiring RoHS compliance.

Selection between Bourns and API Delevan alternatives depends on regulatory compliance requirements and supply chain availability. The Bourns 9250A-274-RC is recommended for applications requiring RoHS compliance. API Delevan ER1641 variants are suitable for applications without RoHS restrictions.

Frequently Asked Questions (FAQ)

Q: Can the 9250A-274-RC directly replace the 9250-274-RC in existing designs?

A: Yes. The 9250A-274-RC maintains identical inductance (270 µH), current rating (115 mA), DC resistance (5.8 Ohm max), and physical dimensions (0.162" Dia x 0.410" L). The extended temperature range of the 9250A-274-RC (-55°C to 125°C) provides additional operational margin compared to the original part (-55°C to 105°C).

Q: What is the difference between the Bourns 9250-274-RC and 9250A-274-RC?

A: The primary difference is construction type: the 9250-274-RC uses a drum core wirewound design, while the 9250A-274-RC uses a molded construction. Electrical performance and physical form factor remain equivalent. The 9250A-274-RC is in active production status, whereas the 9250-274-RC is obsolete.

Q: Are the API Delevan ER1641 series parts suitable for RoHS-compliant applications?

A: No. The ER1641-274KM, ER1641-274KP, and ER1641-274KR variants are RoHS non-compliant. Applications requiring RoHS compliance should use the Bourns 9250A-274-RC, which carries ROHS3 compliance certification.

Q: Do all substitute parts use the same axial through-hole package?

A: Yes. All listed substitute parts (9250A-274-RC, ER1641-274KM, ER1641-274KP, ER1641-274KR) maintain the same axial through-hole package configuration with identical physical dimensions of 0.162" Dia x 0.410" L (4.11 mm x 10.41 mm).

Q: What is the difference between ER1641-274KM, ER1641-274KP, and ER1641-274KR?

A: These three API Delevan part numbers share identical electrical specifications and physical dimensions. The suffix designations (KM, KP, KR) indicate different packaging configurations (Tape & Reel). Electrical performance and form factor are equivalent across all three variants.

Q: Can I use ER1641 series inductors in applications originally designed for the Bourns 9250-274-RC?

A: Electrical substitution is valid based on matching inductance, current rating, DC resistance, and Q factor specifications. However, RoHS compliance status must be evaluated against application requirements. If RoHS compliance is mandatory, use the Bourns 9250A-274-RC instead.

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