Equivalent & Substitute Parts for Bourns 9250-333-RC

Part Overview

The Bourns 9250-333-RC is a 33 µH shielded drum core wirewound inductor rated for 240 mA with a maximum DC resistance of 1.37 Ohm. This component is classified as obsolete, making identification of suitable alternatives necessary for ongoing design support and production continuity. The part features through-hole axial mounting and operates across a temperature range of -55°C to 105°C.

Key Parameters

Parameter	Value
Inductance	33 µH
Tolerance	±10%
Current Rating	240 mA
DC Resistance (Max)	1.37 Ohm
Shielding	Shielded
Core Material	Ferrite
Mounting Type	Through Hole
Package	Axial
Size	0.162" Dia x 0.410" L (4.11mm x 10.41mm)
Operating Temperature	-55°C to 105°C
Q @ 2.5 MHz	45
Self Resonant Frequency	34 MHz

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching the following critical parameters: inductance value (33 µH), tolerance (±10%), current rating (240 mA), DC resistance (1.37 Ohm max), core material (ferrite), mounting type (through hole), package style (axial), and physical dimensions (0.162" Dia x 0.410" L). Shielding configuration and operating temperature range are secondary considerations based on application requirements.

The substitute parts are grouped into two categories:

Direct Substitute (Active Status): 9250A-333-RC meets all primary electrical and mechanical parameters with improved operating temperature range (-55°C to 125°C) and active product status.

Similar Substitutes (Alternative Manufacturers): ER1641-333KM, ER1641-333KP, and ER1641-333KR from API Delevan Inc. match all core electrical specifications and physical dimensions but differ in shielding configuration, compliance certifications, and packaging format.

Parameter Comparison

Parameter	9250-333-RC (Main)	9250A-333-RC	ER1641-333KM	ER1641-333KP	ER1641-333KR
Manufacturer	Bourns Inc.	Bourns Inc.	API Delevan Inc.	API Delevan Inc.	API Delevan Inc.
Inductance	33 µH	33 µH	33 µH	33 µH	33 µH
Tolerance	±10%	±10%	±10%	±10%	±10%
Current Rating	240 mA	240 mA	240 mA	240 mA	240 mA
DC Resistance (Max)	1.37 Ohm	1.37 Ohm	1.37 Ohm	1.37 Ohm	1.37 Ohm
Core Material	Ferrite	Ferrite	Ferrite	Ferrite	Ferrite
Shielding	Shielded	Shielded	Shielded	Shielded	Unshielded
Q @ 2.5 MHz	45	45	45	45	45
Self Resonant Frequency	34 MHz	34 MHz	34 MHz	34 MHz	34 MHz
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
Packaging Format	Bulk	Bulk	Tape & Reel	Tape & Reel	Tape & Reel

Engineering Selection Recommendations

9250A-333-RC is the primary recommended substitute. This Bourns part maintains identical electrical specifications and physical dimensions while offering active product status and an extended operating temperature range to 125°C. Both the main part and this substitute are ROHS3 compliant, ensuring regulatory consistency in applications requiring RoHS certification.

ER1641-333KM and ER1641-333KP are functionally equivalent alternatives from API Delevan Inc., both featuring shielded molded construction. These parts match all core electrical parameters and physical dimensions. However, they are RoHS non-compliant and available only in Tape & Reel packaging. Selection of these parts is appropriate for applications where RoHS compliance is not required and automated assembly processes are utilized.

ER1641-333KR is an unshielded variant from API Delevan Inc. suitable only for applications where electromagnetic shielding is not a design requirement. This part is RoHS non-compliant and available in Tape & Reel format. The unshielded configuration represents a functional deviation from the original shielded design.

Frequently Asked Questions (FAQ)

Q: Can 9250A-333-RC directly replace 9250-333-RC in existing designs?

A: Yes. The 9250A-333-RC maintains identical inductance, current rating, DC resistance, and physical dimensions. The extended operating temperature range (-55°C to 125°C versus -55°C to 105°C) provides additional thermal margin. Both parts are ROHS3 compliant.

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

A: The Bourns 9250A-333-RC is ROHS3 compliant and available in bulk packaging. The API Delevan ER1641 series parts are RoHS non-compliant and supplied in Tape & Reel format. All three maintain equivalent electrical performance and physical dimensions.

Q: When should ER1641-333KR (unshielded) be used instead of the shielded alternatives?

A: The unshielded ER1641-333KR is appropriate only for applications where electromagnetic shielding is not required by circuit design. The shielded variants (ER1641-333KM and ER1641-333KP) are preferred for designs originally specified with shielding.

Q: Are there packaging considerations when switching to API Delevan parts?

A: Yes. The ER1641 series is supplied in Tape & Reel format, requiring compatibility with automated assembly equipment. The Bourns 9250A-333-RC is available in bulk packaging, suitable for manual or mixed assembly processes.

Q: Does RoHS compliance affect part selection?

A: RoHS compliance is a regulatory requirement for many applications. The Bourns 9250A-333-RC is ROHS3 compliant. The API Delevan ER1641 series parts are RoHS non-compliant and should be selected only when regulatory exemptions apply or RoHS compliance is not required.

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