Bourns 9230-78 270µH Axial Inductor Equivalent & Substitute Parts

Part Overview

The Bourns 9230-78 is a 270 µH unshielded molded inductor rated for 65 mA with 25Ohm maximum DC resistance, designed for through-hole axial mounting. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing production support and design continuity. Substitute parts must maintain the same inductance value, core material, shielding configuration, and mounting type while meeting the electrical performance requirements of the original application.

Key Parameters

Parameter	Value
Inductance	270 µH
Tolerance	±10%
Current Rating	65 mA
DC Resistance (Max)	25Ohm
Core Material	Ferrite
Shielding	Unshielded
Mounting Type	Through Hole Axial
Package / Case	Axial
Operating Temperature Range	-55°C ~ 125°C
Q @ Frequency	30 @ 790kHz
Self Resonant Frequency	8MHz
Physical Dimensions	0.095" Dia x 0.250" L (2.41mm x 6.35mm)

Substitute Part Grouping Explanation

Substitute parts for the Bourns 9230-78 are identified based on strict electrical and mechanical compatibility criteria. The following parameters define acceptable substitution:

Inductance value: 270 µH (exact match required)
Inductance tolerance: ±10% (matching specification)
Core material: Ferrite (unshielded configuration)
Mounting type: Through hole axial
Package / case: Axial
Physical dimensions: 0.095" Dia x 0.250" L (2.41mm x 6.35mm)
DC resistance: 25Ohm maximum
Q factor: 30 @ 790kHz
Self resonant frequency: 8MHz

The current rating may vary within the application's design margin, provided the substitute part meets or exceeds the minimum current requirement of the circuit. Operating temperature range and compliance certifications are secondary selection criteria based on application environment and regulatory requirements.

Parameter Comparison

Parameter	Bourns 9230-78	API Delevan 1025-78K	Compatibility
Inductance	270 µH	270 µH	Match
Tolerance	±10%	±10%	Match
Current Rating (Amps)	65 mA	47 mA	Substitute rated lower
DC Resistance (Max)	25Ohm	25Ohm	Match
Core Material	Ferrite	Ferrite	Match
Shielding	Unshielded	Unshielded	Match
Q @ Frequency	30 @ 790kHz	30 @ 790kHz	Match
Frequency - Self Resonant	8MHz	8MHz	Match
Mounting Type	Through Hole	Through Hole	Match
Package / Case	Axial	Axial	Match
Physical Dimensions	0.095" Dia x 0.250" L (2.41mm x 6.35mm)	0.095" Dia x 0.250" L (2.41mm x 6.35mm)	Match
Operating Temperature Range	-55°C ~ 125°C	-55°C ~ 105°C	Substitute range narrower
Product Status	Obsolete	Active	Substitute actively manufactured

Engineering Selection Recommendations

The API Delevan 1025-78K qualifies as a functional substitute for the Bourns 9230-78 based on matching inductance, tolerance, DC resistance, core material, shielding, and physical dimensions. Both components are RoHS non-compliant and REACH unaffected, with identical ECCN and HTSUS classifications.

Selection of the API Delevan 1025-78K requires evaluation of two parameter differences:

Current rating: The substitute part is rated for 47 mA versus the original 65 mA. This substitution is acceptable only if the circuit's actual current demand does not exceed 47 mA. If the application requires the full 65 mA capability, this substitute is not suitable.

Operating temperature range: The substitute operates from -55°C to 105°C, compared to the original -55°C to 125°C. This substitution is acceptable if the application environment remains within the -55°C to 105°C window. Applications requiring operation above 105°C require the original specification or an alternative part with extended temperature rating.

The API Delevan 1025-78K is actively manufactured, providing supply continuity for the obsolete Bourns 9230-78.

Frequently Asked Questions (FAQ)

Q: Can the API Delevan 1025-78K replace the Bourns 9230-78 in all applications?

A: The API Delevan 1025-78K is electrically and mechanically compatible with the Bourns 9230-78 for inductance, tolerance, DC resistance, core material, and physical dimensions. However, substitution is conditional on two factors: the circuit's maximum current demand must not exceed 47 mA, and the operating environment must remain within -55°C to 105°C. If either condition is not met, alternative parts must be evaluated.

Q: What are the critical parameters for substituting this inductor?

A: The critical parameters are inductance (270 µH), tolerance (±10%), DC resistance (25Ohm maximum), core material (ferrite), shielding (unshielded), mounting type (through hole axial), and physical dimensions (0.095" Dia x 0.250" L). These parameters must match exactly for functional equivalence. Current rating and operating temperature range are application-dependent and must be verified against circuit requirements.

Q: Are there any compliance or certification differences between these parts?

A: Both the Bourns 9230-78 and API Delevan 1025-78K share identical RoHS status (non-compliant), REACH status (unaffected), ECCN (EAR99), and HTSUS classification (8504.50.8000). No compliance or certification differences exist between these parts.

Q: What is the physical compatibility between these inductors?

A: Both inductors have identical axial package dimensions of 0.095" diameter by 0.250" length (2.41mm x 6.35mm). They are mechanically interchangeable in through-hole PCB applications with standard 0.032" lead diameter axial component footprints.

Q: Why is the Bourns 9230-78 classified as obsolete?

A: The Bourns 9230-78 is listed as obsolete, indicating it is no longer in active production. The API Delevan 1025-78K, classified as active, represents the current manufacturing alternative for this inductance value and specification class.

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