Bourns 9220-28 Fixed Inductor: Equivalent & Substitute Parts

Part Overview

The Bourns 9220-28 is a 1 mH unshielded drum core wirewound inductor rated for 78 mA with a maximum DC resistance of 16.5 Ohm. This through-hole axial component operates across the temperature range of -55°C to 105°C and is designed for applications requiring fixed inductance values with tight tolerance specifications.

The 9220-28 is classified as obsolete. Locating equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production, repair, and field replacement applications.

Key Parameters

Parameter	Value
Inductance	1 mH
Inductance Tolerance	±5%
Current Rating	78 mA
DC Resistance (Max)	16.5 Ohm
Shielding	Unshielded
Operating Temperature Range	-55°C to 105°C
Mounting Type	Through Hole
Package / Case	Axial
Physical Dimensions	0.190" Dia x 0.440" L (4.83mm x 11.18mm)
Q @ Frequency	60 @ 7.9 MHz
Self Resonant Frequency	2.8 MHz

Substitute Part Grouping Explanation

Substitution of the Bourns 9220-28 is determined by the following critical parameters:

Inductance Value: Must be 1 mH with ±5% tolerance
Current Rating: Substitute must support minimum 78 mA; higher ratings are acceptable
DC Resistance: Maximum 16.5 Ohm
Operating Temperature: Must cover -55°C to 105°C range
Mounting Configuration: Through-hole axial package required
Physical Dimensions: 0.190" Dia x 0.440" L (4.83mm x 11.18mm)
Shielding: Unshielded construction

The API Delevan 2500-28J meets all substitution criteria. While it employs molded construction instead of drum core design, and uses iron core material instead of ferrite, the electrical performance parameters—inductance, tolerance, DC resistance, temperature range, and frequency characteristics—remain equivalent for circuit-level functionality.

Parameter Comparison

Parameter	Bourns 9220-28	API Delevan 2500-28J	Match Status
Inductance	1 mH	1 mH	Equivalent
Inductance Tolerance	±5%	±5%	Equivalent
Current Rating (Amps)	78 mA	88 mA	Compatible (higher rating)
DC Resistance (Max)	16.5 Ohm	16.5 Ohm	Equivalent
Shielding	Unshielded	Unshielded	Equivalent
Operating Temperature Range	-55°C to 105°C	-55°C to 105°C	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	Axial	Axial	Equivalent
Physical Dimensions	0.190" Dia x 0.440" L (4.83mm x 11.18mm)	0.190" Dia x 0.440" L (4.83mm x 11.18mm)	Equivalent
Self Resonant Frequency	2.8 MHz	2.8 MHz	Equivalent
Q @ Frequency	60 @ 7.9 MHz	60 @ 790 kHz	Different test frequency
Product Status	Obsolete	Active	Substitute is active
RoHS Status	RoHS non-compliant	RoHS non-compliant	Equivalent

Engineering Selection Recommendations

The API Delevan 2500-28J is a direct functional substitute for the obsolete Bourns 9220-28. Both components share identical electrical specifications for inductance, tolerance, DC resistance, and operating temperature range. The 2500-28J provides a higher current rating (88 mA versus 78 mA), which offers additional design margin without compromising circuit performance.

Both parts carry identical RoHS non-compliance and REACH unaffected status, ensuring regulatory consistency in applications where these certifications apply. The 2500-28J is currently in active production status, providing reliable long-term availability compared to the obsolete 9220-28.

Physical compatibility is confirmed: both components maintain identical axial through-hole package dimensions (0.190" Dia x 0.440" L), enabling direct board-level substitution without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the API Delevan 2500-28J replace the Bourns 9220-28 in existing designs?

A: Yes. The 2500-28J meets all critical electrical parameters: 1 mH inductance at ±5% tolerance, 16.5 Ohm maximum DC resistance, 78+ mA current capability, and -55°C to 105°C operating range. Physical dimensions are identical, enabling direct board substitution.

Q: What is the difference between drum core and molded construction?

A: The Bourns 9220-28 uses drum core wirewound construction with ferrite material, while the API Delevan 2500-28J uses molded construction with iron core material. Despite these construction differences, both deliver equivalent electrical performance at the specified operating parameters.

Q: Does the higher current rating of the 2500-28J affect circuit compatibility?

A: No. A higher current rating provides additional design margin and does not degrade performance in circuits designed for the 78 mA specification. The component will operate safely within the original design envelope.

Q: Are there packaging differences between these parts?

A: Both components are supplied in through-hole axial packages with identical physical dimensions. The 2500-28J is supplied in cut tape packaging, while the 9220-28 was supplied in standard packaging. This does not affect circuit-level compatibility.

Q: What is the significance of the different Q frequency test points?

A: The Bourns 9220-28 specifies Q at 7.9 MHz, while the API Delevan 2500-28J specifies Q at 790 kHz. Both achieve Q = 60 at their respective test frequencies. This reflects different measurement methodologies but does not indicate functional incompatibility for standard circuit applications.

Q: Are both parts compliant with current regulatory standards?

A: Both the Bourns 9220-28 and API Delevan 2500-28J are RoHS non-compliant and REACH unaffected. Applications requiring RoHS compliance will need alternative components outside this substitution group.

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