Bourns 9230-34 Fixed Inductor Equivalent & Substitute Parts

Part Overview

The Bourns 9230-34 is a 3.9 µH unshielded molded inductor rated for 350 mA with 1Ohm maximum DC resistance, designed for through-hole axial mounting. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates across a temperature range of -55°C to 125°C and is RoHS non-compliant.

Key Parameters

Parameter	Value
Inductance	3.9 µH
Inductance Tolerance	±10%
Current Rating	350 mA
DC Resistance (Max)	1 Ohm
Q @ Frequency	45 @ 7.9 MHz
Frequency - Self Resonant	82 MHz
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Through Hole
Package / Case	Axial
Size / Dimension	0.095" Dia x 0.250" L (2.41mm x 6.35mm)
Shielding	Unshielded

Substitute Part Grouping Explanation

Substitute parts for the Bourns 9230-34 are qualified based on the following critical parameters:

Inductance Value: 3.9 µH (±10% tolerance maintained across all substitutes)
DC Resistance: 1 Ohm maximum
Current Rating: Minimum 263 mA (all substitutes meet or exceed this requirement)
Mounting Type: Through hole axial configuration
Operating Temperature Range: Minimum -55°C lower bound
Q Factor & Self Resonant Frequency: Consistent performance at 7.9 MHz test frequency

Two substitute parts meet these electrical criteria: the API Delevan 1025-34K and the TE Connectivity SC303R9KT. Both maintain the core inductance specification and DC resistance while offering different current ratings and physical dimensions.

Parameter Comparison

Parameter	Bourns 9230-34	API Delevan 1025-34K	TE Connectivity SC303R9KT
Inductance	3.9 µH	3.9 µH	3.9 µH
Inductance Tolerance	±10%	±10%	±10%
Current Rating (Amps)	350 mA	263 mA	420 mA
DC Resistance (Max)	1 Ohm	1 Ohm	1 Ohm
Q @ Frequency	45 @ 7.9 MHz	45 @ 7.9 MHz	45 @ 7.9 MHz
Frequency - Self Resonant	82 MHz	80 MHz	80 MHz
Operating Temperature Range	-55°C ~ 125°C	-55°C ~ 105°C	-55°C ~ 100°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Axial	Axial	Axial
Size / Dimension	0.095" Dia x 0.250" L (2.41mm x 6.35mm)	0.095" Dia x 0.250" L (2.41mm x 6.35mm)	0.165" Dia x 0.394" L (4.20mm x 10.00mm)
Shielding	Unshielded	Unshielded	Shielded
RoHS Status	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

API Delevan 1025-34K: This substitute maintains identical physical dimensions and electrical characteristics to the Bourns 9230-34. The current rating of 263 mA is lower than the original 350 mA specification. Selection of this part is appropriate only when circuit current requirements do not exceed 263 mA. The part remains RoHS non-compliant and operates to 105°C maximum, reducing the upper temperature margin by 20°C compared to the original.

TE Connectivity SC303R9KT: This substitute provides the highest current rating at 420 mA and is ROHS3 compliant, addressing regulatory requirements. The shielded construction differs from the unshielded original, which may affect circuit performance in noise-sensitive applications. Physical dimensions are larger (0.165" Dia x 0.394" L versus 0.095" Dia x 0.250" L), requiring PCB layout verification. Operating temperature maximum is 100°C, further reducing the upper temperature margin. This part is suitable for applications where RoHS compliance is mandatory and PCB space permits the larger footprint.

Frequently Asked Questions (FAQ)

Q: Can the API Delevan 1025-34K directly replace the Bourns 9230-34 in all applications?

A: Direct replacement is possible only if circuit current requirements do not exceed 263 mA. The lower current rating is the limiting factor. All other electrical parameters (inductance, DC resistance, Q factor, self-resonant frequency) are equivalent. Operating temperature range is reduced to 105°C maximum.

Q: What is the primary difference between the TE Connectivity SC303R9KT and the original Bourns part?

A: The SC303R9KT features shielded construction versus the unshielded original design. This affects electromagnetic coupling characteristics and may alter circuit performance in sensitive applications. Additionally, the larger physical dimensions (0.165" Dia x 0.394" L) require PCB layout verification. The part offers higher current capacity (420 mA) and ROHS3 compliance.

Q: Are there physical footprint compatibility concerns with the TE Connectivity substitute?

A: Yes. The SC303R9KT dimensions (0.165" Dia x 0.394" L) differ significantly from the original (0.095" Dia x 0.250" L). PCB hole spacing and component clearance must be verified before implementation. The API Delevan 1025-34K maintains identical dimensions and requires no layout modifications.

Q: Which substitute is recommended for new designs?

A: Selection depends on application requirements. For current demands up to 263 mA with identical form factor, use the API Delevan 1025-34K. For applications requiring RoHS3 compliance and higher current capacity (up to 420 mA), use the TE Connectivity SC303R9KT, provided PCB layout accommodates the larger package and shielded construction is acceptable.

Q: How do operating temperature ranges compare?

A: The original Bourns 9230-34 operates to 125°C maximum. The API Delevan 1025-34K operates to 105°C (20°C reduction). The TE Connectivity SC303R9KT operates to 100°C (25°C reduction). Applications requiring operation above 100°C may not be suitable for either substitute.

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