Equivalent & Substitute Parts for Bourns 9310-04

Part Overview

The Bourns 9310-04 is a 330 nH unshielded drum core wirewound inductor rated for 1.4 A with a maximum DC resistance of 90 mOhm. This through-hole axial component operates across a temperature range of -55°C to 105°C and is designed for applications requiring fixed inductance in the sub-microhenry range. The 9310-04 is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Inductance	330 nH
Tolerance	±20%
Current Rating	1.4 A
DC Resistance (Max)	90 mOhm
Q @ 25 MHz	45
Self Resonant Frequency	360 MHz
Operating Temperature Range	-55°C to 105°C
Mounting Type	Through Hole
Package	Axial
Physical Dimensions	0.156" Dia x 0.375" L (3.96mm x 9.53mm)
Shielding	Unshielded

Substitute Part Grouping Explanation

Substitution for the Bourns 9310-04 is determined by strict equivalence across the following critical parameters:

Inductance Value: 330 nH (exact match required)
DC Resistance: 90 mOhm maximum (no deviation permitted)
Current Rating: Minimum 1.4 A (equal or higher acceptable)
Q Factor: 45 @ 25 MHz (electrical performance baseline)
Self Resonant Frequency: 360 MHz (frequency response characteristic)
Mounting and Package: Through-hole axial configuration with identical physical dimensions (0.156" Dia x 0.375" L)
Shielding: Unshielded construction
Operating Temperature: Minimum -55°C to 105°C range (extended ranges acceptable)

The substitute parts listed below meet all these criteria and are therefore electrically and mechanically interchangeable with the 9310-04 in applications where the specified parameters are required.

Parameter Comparison

Parameter	Bourns 9310-04	API Delevan 1537-04M	API Delevan ER1537-04LR
Inductance	330 nH	330 nH	330 nH
Tolerance	±20%	±20%	±10%
Current Rating (Amps)	1.4 A	1.58 A	1.4 A
DC Resistance (Max)	90 mOhm	90 mOhm	90 mOhm
Q @ 25 MHz	45	45	45
Self Resonant Frequency	360 MHz	360 MHz	360 MHz
Operating Temperature Range	-55°C to 105°C	-55°C to 125°C	-55°C to 125°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Axial	Axial	Axial
Physical Dimensions	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)
Shielding	Unshielded	Unshielded	Unshielded
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	Non-compliant	Non-compliant

Engineering Selection Recommendations

Both API Delevan substitute parts are active products with current manufacturing support, addressing the obsolescence of the Bourns 9310-04.

API Delevan 1537-04M provides a direct functional replacement with a higher current rating (1.58 A versus 1.4 A) and an extended operating temperature range to 125°C. This part is available in tape and reel packaging for automated assembly processes.

API Delevan ER1537-04LR is qualified to MIL-PRF-39010/06 military specifications and offers tighter inductance tolerance (±10% versus ±20%), making it suitable for applications requiring enhanced precision and military-grade reliability. The extended temperature range to 125°C provides additional thermal margin.

Both substitutes maintain electrical equivalence through identical inductance, DC resistance, Q factor, and self-resonant frequency specifications. Selection between them depends on packaging requirements (tape and reel versus standard), tolerance specifications, and military qualification needs.

Frequently Asked Questions (FAQ)

Q: Can the API Delevan 1537-04M be used as a direct replacement for the Bourns 9310-04?

A: Yes. The 1537-04M meets all critical electrical parameters: 330 nH inductance, 90 mOhm DC resistance, 45 Q @ 25 MHz, and 360 MHz self-resonant frequency. The higher current rating (1.58 A) and extended temperature range (to 125°C) provide additional design margin. Physical dimensions and axial through-hole mounting are identical.

Q: What is the difference between the two API Delevan substitutes?

A: The 1537-04M is a standard molded inductor available in tape and reel packaging. The ER1537-04LR is a military-qualified variant (MIL-PRF-39010/06) with tighter inductance tolerance (±10% versus ±20%). Both are electrically equivalent to the 9310-04.

Q: Are there any compliance differences between the main part and substitutes?

A: All three parts are RoHS non-compliant and REACH unaffected. The ER1537-04LR carries military qualification under MIL-PRF-39010/06, which may be required for specific applications.

Q: Does the higher current rating of the 1537-04M affect circuit performance?

A: No. A higher current rating indicates greater thermal margin and does not alter the electrical characteristics of the inductor. The inductance, DC resistance, Q factor, and frequency response remain identical to the 9310-04.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes. All three parts share identical physical dimensions (0.156" Dia x 0.375" L), axial through-hole mounting, and package footprint. No PCB redesign is required.

Q: What is the significance of the ±10% tolerance on the ER1537-04LR?

A: The tighter tolerance reduces inductance variation across the production range, providing more consistent circuit performance. This is beneficial in applications where inductance precision directly affects circuit behavior.

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