Bourns 9310-44 Equivalent & Substitute Parts

Part Overview

The Bourns 9310-44 is a 22 µH unshielded drum core wirewound inductor rated for 265 mA with a maximum DC resistance of 2.5 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 values in compact form factors.

The 9310-44 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this component.

Key Parameters

Parameter	Value
Inductance	22 µH
Tolerance	±10%
Current Rating	265 mA
DC Resistance (Max)	2.5 Ohm
Q @ Frequency	75 @ 2.5 MHz
Self Resonant Frequency	30 MHz
Operating Temperature Range	-55°C to 105°C
Mounting Type	Through Hole
Package / Case	Axial
Size / Dimension	0.156" Dia x 0.375" L (3.96mm x 9.53mm)
Shielding	Unshielded

Substitute Part Grouping Explanation

Substitution of the Bourns 9310-44 is determined by strict equivalence across the following critical parameters:

Inductance Value: 22 µH (exact match required)
Inductance Tolerance: ±10% (matching tolerance specification)
Current Rating: Substitute must support minimum 265 mA; lower ratings are not acceptable
DC Resistance: Maximum 2.5 Ohm (substitute must not exceed this value)
Q Factor: 75 @ 2.5 MHz (electrical performance indicator)
Self Resonant Frequency: 30 MHz (frequency response characteristic)
Operating Temperature Range: -55°C to 105°C (thermal compatibility)
Mounting Type: Through Hole (mechanical compatibility)
Package / Case: Axial (form factor and PCB layout compatibility)
Physical Dimensions: 0.156" Dia x 0.375" L (3.96mm x 9.53mm) (board space constraint)
Shielding: Unshielded (electromagnetic environment compatibility)

The API Delevan 1537-44K meets these substitution criteria with the exception of current rating, which is specified at 202 mA. This represents a 23.8% reduction in current capacity relative to the original specification.

Parameter Comparison

Parameter	Bourns 9310-44	API Delevan 1537-44K	Match Status
Inductance	22 µH	22 µH	Exact Match
Tolerance	±10%	±10%	Exact Match
Current Rating (Amps)	265 mA	202 mA	Reduced Capacity
DC Resistance (Max)	2.5 Ohm	2.5 Ohm	Exact Match
Q @ Frequency	75 @ 2.5 MHz	75 @ 2.5 MHz	Exact Match
Self Resonant Frequency	30 MHz	30 MHz	Exact Match
Operating Temperature Range	-55°C to 105°C	-55°C to 105°C	Exact Match
Mounting Type	Through Hole	Through Hole	Exact Match
Package / Case	Axial	Axial	Exact Match
Size / Dimension	0.156" Dia x 0.375" L (3.96mm x 9.53mm)	0.156" Dia x 0.375" L (3.96mm x 9.53mm)	Exact Match
Shielding	Unshielded	Unshielded	Exact Match
Product Status	Obsolete	Active	Substitute is Active

Engineering Selection Recommendations

The API Delevan 1537-44K is an active product classified under military specifications (MIL-PRF-M15305, MS14046), providing improved supply chain availability compared to the obsolete Bourns 9310-44.

Both components share identical electrical and mechanical specifications with one exception: the API Delevan substitute operates at a reduced current rating of 202 mA versus the original 265 mA specification. This 63 mA reduction in current capacity must be evaluated against the actual operating current of the target application. If the application current does not exceed 202 mA, the substitute is electrically and mechanically compatible.

Both components carry identical RoHS non-compliance and REACH unaffected status. Compliance requirements should be confirmed against the target application's regulatory framework.

Frequently Asked Questions (FAQ)

Q: Can the API Delevan 1537-44K be used as a direct replacement for the Bourns 9310-44?

A: The API Delevan 1537-44K is mechanically and electrically compatible for applications where the operating current does not exceed 202 mA. If your circuit operates at currents between 202 mA and 265 mA, the substitute will not meet the original specification.

Q: What is the significance of the current rating difference?

A: The Bourns 9310-44 is rated for 265 mA maximum current, while the API Delevan 1537-44K is rated for 202 mA. This difference reflects different core materials (ferrite versus iron) and winding configurations. Operating the substitute above 202 mA may result in inductor saturation and performance degradation.

Q: Are the physical dimensions identical?

A: Yes. Both components measure 0.156" diameter by 0.375" length (3.96mm x 9.53mm), ensuring identical PCB footprint and mounting compatibility.

Q: Do both components have the same inductance tolerance?

A: Yes. Both the Bourns 9310-44 and API Delevan 1537-44K are specified at ±10% inductance tolerance, ensuring equivalent circuit performance in tolerance-sensitive applications.

Q: What is the difference between ferrite and iron core materials?

A: The Bourns 9310-44 uses a ferrite core, while the API Delevan 1537-44K uses an iron core. Both materials achieve the specified 22 µH inductance and 75 Q factor at 2.5 MHz. The core material difference accounts for the reduced current rating in the substitute.

Q: Are compliance certifications identical?

A: Both components are RoHS non-compliant and REACH unaffected. The API Delevan 1537-44K carries additional military specification designations (MIL-PRF-M15305, MS14046), which may be advantageous for defense or aerospace applications.

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