Equivalent & Substitute Parts for 9310-28-RC

Part Overview

The Bourns 9310-28-RC 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 a temperature range of -55°C to 105°C. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Active alternatives from API Delevan Inc. provide functional equivalence while maintaining the same electrical specifications and physical form factor.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution eligibility for the 9310-28-RC is determined by the following critical parameters:

Inductance Value: 4.7 µH (exact match required)
Tolerance: ±10% (exact match required)
DC Resistance: 2.6 Ohm maximum (exact match required)
Current Rating: Minimum 260 mA (equal or higher acceptable)
Q Factor & Self Resonant Frequency: 33 @ 7.9 MHz and 90 MHz (exact match required)
Physical Form Factor: Axial through-hole, 0.156" Dia x 0.375" L (exact match required)
Shielding: Unshielded (exact match required)

The substitute parts from API Delevan Inc. meet these core electrical and mechanical requirements. The primary difference lies in core material composition (phenolic vs. ferrite) and packaging format, which do not affect functional equivalence in the specified application parameters.

Parameter Comparison

Parameter	9310-28-RC (Bourns)	1537R-28K (API Delevan)	ER1537-28KM (API Delevan)	ER1537-28KP (API Delevan)	ER1537-28KR (API Delevan)
Inductance	4.7 µH	4.7 µH	4.7 µH	4.7 µH	4.7 µH
Tolerance	±10%	±10%	±10%	±10%	±10%
Current Rating (mA)	260	294	260	260	260
DC Resistance (Max)	2.6 Ohm	2.6 Ohm	2.6 Ohm	2.6 Ohm	2.6 Ohm
Q @ Frequency	33 @ 7.9 MHz	33 @ 7.9 MHz	33 @ 7.9 MHz	33 @ 7.9 MHz	33 @ 7.9 MHz
Self Resonant Frequency	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
Physical Dimensions	0.156" Dia x 0.375" L	0.156" Dia x 0.375" L	0.156" Dia x 0.375" L	0.156" Dia x 0.375" L	0.156" Dia x 0.375" L
Shielding	Unshielded	Unshielded	Unshielded	Unshielded	Unshielded
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant

Engineering Selection Recommendations

Primary Recommendation: 1537R-28K

The 1537R-28K is the preferred direct substitute. It maintains ROHS3 compliance matching the original part, operates across an extended temperature range (-55°C to 125°C), and is actively manufactured. The current rating of 294 mA exceeds the 260 mA requirement, providing additional design margin. This part is supplied in Cut Tape packaging.

Secondary Options: ER1537-28KM, ER1537-28KP, ER1537-28KR

These three variants are functionally equivalent alternatives with identical electrical specifications to the original 9310-28-RC. All three are actively produced and supplied in Tape & Reel packaging. Selection among these three should be based on packaging requirements and inventory availability. Note that these variants are RoHS non-compliant; use only in applications where RoHS compliance is not mandated.

All substitute parts maintain the same physical form factor, electrical performance, and mechanical compatibility with the original circuit design.

Frequently Asked Questions (FAQ)

Q: Can the 1537R-28K replace the 9310-28-RC in all applications?

A: Yes. The 1537R-28K meets all critical electrical parameters: 4.7 µH inductance, ±10% tolerance, 2.6 Ohm maximum DC resistance, 260 mA minimum current rating, and identical Q factor and self-resonant frequency. Physical dimensions and mounting type are identical. The extended temperature range and higher current rating provide additional operational margin.

Q: What is the difference between 1537R-28K and the ER1537 variants?

A: The 1537R-28K and ER1537 variants are electrically identical. The primary differences are packaging format (Cut Tape vs. Tape & Reel) and RoHS compliance status. The 1537R-28K is ROHS3 compliant; the ER1537 variants are not. Select based on your packaging requirements and regulatory compliance needs.

Q: Why do the ER1537 variants show RoHS non-compliance?

A: RoHS compliance status is provided as specified in the component data. This designation should be verified against your specific application requirements and regional regulations before selection.

Q: Are the physical dimensions identical across all substitute parts?

A: Yes. All substitute parts maintain the same axial form factor: 0.156" diameter by 0.375" length (3.96mm x 9.53mm). Direct board-level substitution is possible without mechanical redesign.

Q: Does the core material difference (ferrite vs. phenolic) affect performance?

A: No. The electrical specifications—inductance, Q factor, self-resonant frequency, and DC resistance—are identical across all parts. Core material composition does not affect functional equivalence for the specified electrical parameters.

Q: Which substitute should I choose for new designs?

A: For new designs, use the 1537R-28K. It is actively manufactured, ROHS3 compliant, and provides the best long-term availability and regulatory alignment.

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