Bourns 9310-08 680nH Axial Inductor: Equivalent & Substitute Parts

Part Overview

The Bourns 9310-08 is a 680nH unshielded drum core wirewound inductor rated for 1.1A continuous current with 150mOhm maximum DC resistance. Designed for through-hole axial mounting, this component operates across the -55°C to 105°C temperature range and is specified at 25MHz with a self-resonant frequency of 250MHz.

The 9310-08 is classified as obsolete. Equivalent and substitute inductors from API Delevan Inc. provide active product alternatives with compatible electrical and mechanical specifications, enabling direct circuit board replacement without design modification.

Key Parameters

Parameter	Value
Inductance	680 nH
Tolerance	±10%
Current Rating	1.1 A
DC Resistance (Max)	150 mOhm
Q @ 25MHz	50
Self-Resonant Frequency	250 MHz
Operating Temperature Range	-55°C to 105°C
Mounting Type	Through Hole Axial
Package Dimensions	0.156" Dia × 0.375" L (3.96mm × 9.53mm)
Shielding	Unshielded

Substitute Part Grouping Explanation

Substitution eligibility for the Bourns 9310-08 is determined by strict equivalence across the following parameters:

Inductance Value: 680 nH ±10% tolerance
Current Rating: Minimum 1.1 A continuous
DC Resistance: Maximum 150 mOhm
Q Factor: 50 @ 25 MHz
Self-Resonant Frequency: 250 MHz
Mounting Configuration: Through-hole axial package
Physical Dimensions: 0.156" diameter × 0.375" length
Shielding: Unshielded construction
Operating Temperature: Minimum -55°C to 105°C range

All substitute parts listed meet these electrical and mechanical criteria. Variations in core material (phenolic vs. ferrite), construction type (molded vs. drum core), and packaging format (tape & reel vs. cut tape) do not affect functional equivalence when electrical specifications remain identical.

Parameter Comparison

Part Number	Manufacturer	Inductance	Current Rating (A)	DCR Max (mOhm)	Q @ 25MHz	SRF (MHz)	Temp Range (°C)	Packaging	Status
9310-08	Bourns Inc.	680 nH	1.1	150	50	250	-55 to 105	Axial	Obsolete
1537-08K	API Delevan Inc.	680 nH	1.22	150	50	250	-55 to 125	Tape & Reel	Active
1537R-08K	API Delevan Inc.	680 nH	1.22	150	50	250	-55 to 125	Cut Tape	Active
ER1537-08KM	API Delevan Inc.	680 nH	1.1	150	50	250	-55 to 105	Tape & Reel	Active
ER1537-08KP	API Delevan Inc.	680 nH	1.1	150	50	250	-55 to 105	Tape & Reel	Active
ER1537-08KR	API Delevan Inc.	680 nH	1.1	150	50	250	-55 to 125	Cut Tape	Active

Engineering Selection Recommendations

Direct Electrical Equivalents (Identical Current Rating)

ER1537-08KM, ER1537-08KP, and ER1537-08KR maintain the exact 1.1A current rating of the Bourns 9310-08. These parts are functionally interchangeable for applications requiring the original current specification. ER1537-08KR offers extended temperature operation to 125°C and is available in cut tape packaging. ER1537-08KM and ER1537-08KP are supplied in tape & reel format and operate within the original -55°C to 105°C range.

Higher Current Capacity Alternatives

1537-08K and 1537R-08K provide 1.22A current rating, exceeding the original 1.1A specification while maintaining all other electrical parameters. These parts accommodate higher current applications and extend operating temperature to 125°C. 1537-08K is supplied in tape & reel; 1537R-08K is available in cut tape. The 1537R-08K variant is RoHS3 compliant, whereas other substitutes remain RoHS non-compliant.

Product Status Consideration

All API Delevan substitute parts carry active product status, ensuring continued availability and manufacturing support. The Bourns 9310-08 is obsolete and subject to supply discontinuation.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher current rating (1.22A) in place of the 1.1A Bourns 9310-08?

A: Yes. The 1537-08K and 1537R-08K inductors are rated for 1.22A continuous current, which exceeds the original 1.1A requirement. All other electrical parameters—inductance, DCR, Q factor, and self-resonant frequency—remain identical. Higher current rating does not degrade performance in circuits designed for lower current operation.

Q: What is the difference between tape & reel and cut tape packaging?

A: Tape & reel packaging supplies components on continuous carrier tape wound on reels, suitable for automated assembly equipment. Cut tape packaging provides components on tape segments, typically for manual assembly or lower-volume applications. Electrical performance is identical; packaging selection depends on assembly process requirements.

Q: Does the phenolic core material in API Delevan parts differ functionally from the ferrite core in the Bourns 9310-08?

A: No. Both core materials achieve the specified 680nH inductance, 150mOhm DCR, and 50 Q-factor at 25MHz. Core material selection does not affect electrical equivalence when all performance parameters are identical.

Q: Is the ER1537-08KR suitable for high-temperature applications?

A: The ER1537-08KR operates across -55°C to 125°C, extending 20°C above the original Bourns 9310-08 specification (-55°C to 105°C). This part is appropriate for applications requiring the extended upper temperature limit.

Q: Why is 1537R-08K marked RoHS3 compliant while other substitutes are not?

A: RoHS compliance status reflects the manufacturing process and material sourcing at the time of production. The 1537R-08K meets RoHS3 requirements; other parts do not. Selection should account for end-product regulatory requirements.

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