Bourns 9310-28 Equivalent & Substitute Parts

Part Overview

The Bourns 9310-28 is a 4.7 µH unshielded drum core wirewound inductor rated for 260 mA with a maximum DC resistance of 2.6 Ohm. This through-hole axial component operates across the temperature range of -55°C to 105°C and features a self-resonant frequency of 90 MHz. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Suitable alternatives maintain the same inductance value, current rating, DC resistance, and physical dimensions while offering active product status from alternative manufacturers.

Key Parameters

Parameter	Value
Inductance	4.7 µH
Tolerance	±10%
Current Rating	260 mA
DC Resistance (Max)	2.6 Ohm
Shielding	Unshielded
Mounting Type	Through Hole
Package / Case	Axial
Size / Dimension	0.156" Dia x 0.375" L (3.96mm x 9.53mm)
Operating Temperature	-55°C ~ 105°C
Q @ Freq	33 @ 7.9MHz
Frequency - Self Resonant	90 MHz

Substitute Part Grouping Explanation

Substitution eligibility for the Bourns 9310-28 is determined by strict equivalence across the following critical parameters:

Inductance Value: 4.7 µH (±10% tolerance maintained)
Current Rating: Minimum 260 mA
DC Resistance: 2.6 Ohm maximum
Shielding Configuration: Unshielded
Mounting Type: Through Hole
Package / Case: Axial
Physical Dimensions: 0.156" Dia x 0.375" L (3.96mm x 9.53mm)
Q Factor: 33 @ 7.9MHz
Self-Resonant Frequency: 90 MHz

All substitute parts listed below meet these electrical and mechanical specifications. Variations in core material (phenolic vs. ferrite), inductor type (molded vs. drum core), and operating temperature range do not affect functional substitution when the above parameters are matched.

Parameter Comparison

Parameter	Bourns 9310-28	API Delevan 1537-28K	API Delevan ER1537-28KM	API Delevan ER1537-28KP	API Delevan ER1537-28KR
Manufacturer	Bourns Inc.	API Delevan Inc.	API Delevan Inc.	API Delevan Inc.	API Delevan Inc.
Inductance	4.7 µH	4.7 µH	4.7 µH	4.7 µH	4.7 µH
Tolerance	±10%	±10%	±10%	±10%	±10%
Current Rating (Amps)	260 mA	294 mA	260 mA	260 mA	260 mA
DC Resistance (Max)	2.6 Ohm	2.6 Ohm	2.6 Ohm	2.6 Ohm	2.6 Ohm
Shielding	Unshielded	Unshielded	Unshielded	Unshielded	Unshielded
Q @ Freq	33 @ 7.9MHz	33 @ 7.9MHz	33 @ 7.9MHz	33 @ 7.9MHz	33 @ 7.9MHz
Frequency - Self Resonant	90 MHz	90 MHz	90 MHz	90 MHz	90 MHz
Operating Temperature	-55°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Axial	Axial	Axial	Axial	Axial
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)	0.156" Dia x 0.375" L (3.96mm x 9.53mm)	0.156" Dia x 0.375" L (3.96mm x 9.53mm)	0.156" Dia x 0.375" L (3.96mm x 9.53mm)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant

Engineering Selection Recommendations

All four API Delevan substitute parts (1537-28K, ER1537-28KM, ER1537-28KP, ER1537-28KR) provide direct functional equivalence to the obsolete Bourns 9310-28 across all critical electrical and mechanical parameters. Selection among these alternatives should be based on product availability and packaging requirements.

The API Delevan 1537-28K offers an extended operating temperature range of -55°C to 125°C compared to the original -55°C to 105°C specification, providing additional thermal margin for applications requiring higher temperature operation. This part also supports a higher current rating of 294 mA while maintaining the same DC resistance and inductance specifications.

The ER1537 series parts (ER1537-28KM, ER1537-28KP, ER1537-28KR) are molded inductors with identical electrical performance to the original drum core design. These parts maintain the original operating temperature range of -55°C to 105°C and current rating of 260 mA. All substitute parts are supplied in Tape & Reel packaging and carry the same ECCN (EAR99) and HTSUS (8504.50.8000) classifications as the original component.

Frequently Asked Questions (FAQ)

Q: Can the API Delevan 1537-28K be used as a direct replacement for the Bourns 9310-28?

A: Yes. The 1537-28K meets all critical electrical specifications: 4.7 µH inductance, 260 mA minimum current rating, 2.6 Ohm maximum DC resistance, and identical physical dimensions. The extended temperature range to 125°C provides additional operational margin.

Q: What is the difference between the 1537-28K and the ER1537 series parts?

A: The 1537-28K is a standard unshielded inductor with a phenolic core and supports 294 mA current rating. The ER1537-28KM, ER1537-28KP, and ER1537-28KR are molded variants with phenolic cores, each rated for 260 mA. All four parts maintain identical inductance, DC resistance, and physical dimensions. The ER1537 variants differ only in packaging configuration codes (M, P, R designations).

Q: Are there any compatibility concerns when substituting these parts?

A: No compatibility concerns exist for applications requiring the specified electrical and mechanical parameters. All substitute parts are through-hole axial components with identical 0.156" diameter and 0.375" length dimensions, ensuring direct PCB footprint compatibility.

Q: What is the significance of the core material difference between drum core and molded inductors?

A: Both drum core and molded constructions deliver the same electrical performance when specifications are matched. The core material difference does not affect inductance value, Q factor, self-resonant frequency, or DC resistance. Selection between drum core and molded types is based on availability and packaging preference.

Q: Do all substitute parts carry the same regulatory classifications?

A: Yes. All substitute parts share identical ECCN (EAR99), HTSUS (8504.50.8000), and RoHS non-compliance status with the original Bourns 9310-28. REACH status is unaffected for all parts.

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