Bourns 9310-40-RC Equivalent & Substitute Parts

Part Overview

The Bourns 9310-40-RC is a 15 µH unshielded drum core wirewound inductor rated for 370 mA with a maximum DC resistance of 1.4 Ohm, 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 105°C and meets ROHS3 compliance requirements.

Key Parameters

Parameter	Value
Inductance	15 µH
Inductance Tolerance	±10%
Current Rating	370 mA
DC Resistance (DCR)	1.4 Ohm Max
Core Material	Ferrite
Shielding	Unshielded
Mounting Type	Through Hole
Package Type	Axial
Operating Temperature	-55°C ~ 105°C
Q @ Frequency	65 @ 2.5 MHz
Self Resonant Frequency	40 MHz

Substitute Part Grouping Explanation

Substitution eligibility for the Bourns 9310-40-RC is determined by the following critical parameters:

Inductance Value: Must be 15 µH with ±10% tolerance
Mounting Configuration: Through-hole axial package required
Core Type & Shielding: Unshielded construction acceptable
Current Rating: Must support minimum 370 mA operation
DC Resistance: Maximum 1.4 Ohm DCR
Frequency Characteristics: Q factor and self-resonant frequency within acceptable operating range
Compliance: ROHS3 compliance required

Two substitute parts meet these criteria with varying trade-offs in current capacity, DC resistance, and core material composition.

Parameter Comparison

Parameter	Bourns 9310-40-RC (Main)	EPCOS B78108S1153K000 (Direct)	API Delevan 1537R-40K (Similar)
Inductance	15 µH	15 µH	15 µH
Inductance Tolerance	±10%	±10%	±10%
Current Rating (Amps)	370 mA	610 mA	271 mA
DC Resistance (DCR)	1.4 Ohm Max	600 mOhm Max	1.4 Ohm Max
Core Material	Ferrite	Ferrite	Iron
Shielding	Unshielded	Unshielded	Unshielded
Q @ Frequency	65 @ 2.5 MHz	60 @ 2.52 MHz	65 @ 2.5 MHz
Self Resonant Frequency	40 MHz	20 MHz	40 MHz
Mounting Type	Through Hole	Through Hole	Through Hole
Package Type	Axial	Axial	Axial
Operating Temperature	-55°C ~ 105°C	Not specified	-55°C ~ 105°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

EPCOS B78108S1153K000 (Direct Substitute)

This part is classified as a direct manufacturer substitute. It maintains ferrite core construction and unshielded axial configuration identical to the main part. The B78108S1153K000 exceeds the current rating requirement at 610 mA versus 370 mA, providing design margin. DC resistance is significantly lower at 600 mOhm maximum, reducing power dissipation. The part is active in production with ROHS3 compliance and REACH affected status. Self-resonant frequency is lower at 20 MHz compared to 40 MHz, which may affect high-frequency performance in specific applications.

API Delevan 1537R-40K (Similar Substitute)

This part is classified as a similar substitute with notable differences. It uses iron core material instead of ferrite, affecting frequency response characteristics. Current rating is 271 mA, which is below the main part specification of 370 mA and represents a design constraint. DC resistance matches the main part at 1.4 Ohm maximum. Q factor and self-resonant frequency are identical to the main part at 65 @ 2.5 MHz and 40 MHz respectively. The part is active in production with ROHS3 compliance and REACH unaffected status. Operating temperature range matches the main part at -55°C to 105°C.

Selection between substitutes depends on application requirements: choose B78108S1153K000 for applications requiring higher current capacity and lower losses; choose 1537R-40K for applications requiring identical frequency response and core material compatibility with iron-based designs.

Frequently Asked Questions (FAQ)

Q: Can the EPCOS B78108S1153K000 be used as a direct replacement for the Bourns 9310-40-RC?

A: Yes, the B78108S1153K000 meets all critical substitution parameters: 15 µH inductance, ±10% tolerance, through-hole axial mounting, unshielded construction, and ROHS3 compliance. The higher current rating (610 mA vs 370 mA) and lower DC resistance (600 mOhm vs 1.4 Ohm) provide performance advantages. The lower self-resonant frequency (20 MHz vs 40 MHz) must be evaluated for applications operating near or above 20 MHz.

Q: Why is the API Delevan 1537R-40K listed as a similar rather than direct substitute?

A: The 1537R-40K uses iron core material instead of ferrite, altering electromagnetic characteristics. More significantly, the current rating of 271 mA falls below the main part specification of 370 mA, making it unsuitable for applications requiring the full 370 mA capacity. It is suitable only for applications drawing 271 mA or less.

Q: What are the packaging differences between these parts?

A: The Bourns 9310-40-RC uses standard through-hole packaging. The EPCOS B78108S1153K000 is supplied in cut tape format. The API Delevan 1537R-40K is supplied in tape and reel format. All three maintain identical axial through-hole mounting configuration and physical dimensions within tolerance.

Q: Are there compliance or regulatory differences between the substitutes?

A: All three parts are ROHS3 compliant. The EPCOS B78108S1153K000 has REACH affected status, while the Bourns 9310-40-RC and API Delevan 1537R-40K have REACH unaffected status. Both the main part and API Delevan part are classified as ROHS unaffected. Regulatory requirements for your application determine the relevance of REACH status.

Q: What is the impact of DC resistance differences on circuit performance?

A: The EPCOS B78108S1153K000 has 600 mOhm DCR compared to 1.4 Ohm for both the main part and API Delevan substitute. Lower DCR reduces resistive losses and heat generation, beneficial for high-current applications. Applications sensitive to inductor impedance at DC or low frequencies will experience different circuit behavior with the EPCOS part.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message