Equivalent & Substitute Parts for Bourns 5900-391

Part Overview

The Bourns 5900-391 is a 390 µH unshielded drum core wirewound inductor rated for 1.2 A with a maximum DC resistance of 310 mOhm. This through-hole axial component operates across -55°C to 105°C and is designed for applications requiring fixed inductance in compact form factors. The 5900-391 carries an obsolete product status, making identification of equivalent and substitute parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Inductance	390 µH
Tolerance	±10%
Current Rating	1.2 A
DC Resistance (Max)	310 mOhm
Core Type	Ferrite, Unshielded Drum Core
Mounting Type	Through Hole, Axial
Operating Temperature Range	-55°C to 105°C
Package Dimension	0.453" Dia × 0.900" L (11.51 mm × 22.86 mm)
Inductance Test Frequency	1 kHz

Substitute Part Grouping Explanation

Substitution eligibility for the 5900-391 is determined by the following critical parameters: inductance value (390 µH), tolerance (±10%), core material and shielding configuration (ferrite, unshielded), mounting type (through-hole axial), and physical dimensions compatible with the original footprint. Current rating and DC resistance are secondary selection criteria; substitute parts with equal or higher current ratings and equal or lower DC resistance maintain or improve performance margins.

The substitute parts are grouped as follows:

Direct Equivalent (Same Manufacturer): 5900-391-RC maintains identical electrical specifications and physical dimensions, differing only in packaging format and product status.

Similar Alternatives (Different Manufacturer): 4590-394K and 4590R-394K from API Delevan Inc. share the same inductance, tolerance, core type, and mounting configuration. These parts feature improved current ratings (1.52 A vs. 1.2 A) and lower DC resistance (288 mOhm vs. 310 mOhm), with dimensions within acceptable tolerance of the original part.

Parameter Comparison

Parameter	5900-391 (Main)	5900-391-RC (Direct)	4590-394K (Similar)	4590R-394K (Similar)
Manufacturer	Bourns Inc.	Bourns Inc.	API Delevan Inc.	API Delevan Inc.
Inductance	390 µH	390 µH	390 µH	390 µH
Tolerance	±10%	±10%	±10%	±10%
Current Rating	1.2 A	1.2 A	1.52 A	1.52 A
DC Resistance (Max)	310 mOhm	310 mOhm	288 mOhm	288 mOhm
Core Type	Ferrite, Unshielded	Ferrite, Unshielded	Ferrite, Unshielded	Ferrite, Unshielded
Mounting Type	Through Hole, Axial	Through Hole, Axial	Through Hole, Axial	Through Hole, Axial
Operating Temperature	-55°C to 105°C	-55°C to 105°C	-55°C to 125°C	-55°C to 125°C
Package Dimension	0.453" Dia × 0.900" L	0.453" Dia × 0.900" L	0.455" Dia × 0.900" L	0.455" Dia × 0.900" L
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	Non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

5900-391-RC is the primary substitute for the obsolete 5900-391. Both parts are manufactured by Bourns Inc. and share identical electrical and mechanical specifications. The 5900-391-RC is currently in active production status with ROHS3 compliance, making it the preferred choice for new designs and ongoing procurement. Packaging differs (tray vs. standard), but electrical performance is equivalent.

4590-394K and 4590R-394K from API Delevan Inc. serve as secondary alternatives when Bourns parts are unavailable. Both API Delevan parts deliver superior performance margins: higher current rating (1.52 A vs. 1.2 A) and lower DC resistance (288 mOhm vs. 310 mOhm). The extended operating temperature range (-55°C to 125°C vs. -55°C to 105°C) provides additional thermal headroom. Physical dimensions are within 0.002" tolerance of the original part, ensuring PCB footprint compatibility. The 4590R-394K variant includes ROHS3 compliance for regulated applications.

Selection priority: 5900-391-RC for direct replacement; 4590R-394K for new designs requiring RoHS compliance; 4590-394K for cost-optimized applications where RoHS compliance is not mandated.

Frequently Asked Questions (FAQ)

Q: Can the 5900-391-RC be used as a direct drop-in replacement for the 5900-391?

A: Yes. The 5900-391-RC is electrically and mechanically identical to the 5900-391. Both parts feature 390 µH inductance, 1.2 A current rating, 310 mOhm maximum DC resistance, and identical physical dimensions. The only difference is packaging format (tray vs. standard) and active product status of the -RC variant.

Q: What are the key differences between the Bourns 5900-391-RC and the API Delevan 4590R-394K?

A: Both parts maintain 390 µH inductance and ±10% tolerance. The API Delevan 4590R-394K offers higher current rating (1.52 A vs. 1.2 A), lower DC resistance (288 mOhm vs. 310 mOhm), and extended operating temperature range (-55°C to 125°C vs. -55°C to 105°C). Physical dimensions differ by 0.002" in diameter (0.455" vs. 0.453"). The 4590R-394K includes ROHS3 compliance, while the 5900-391-RC is ROHS3 compliant but the original 5900-391 is not.

Q: Are the API Delevan 4590-394K and 4590R-394K interchangeable?

A: Electrically and mechanically, yes. Both parts share identical inductance, tolerance, current rating, DC resistance, core type, and physical dimensions. The primary difference is RoHS compliance status: 4590R-394K is ROHS3 compliant, while 4590-394K is not. Selection depends on regulatory requirements for the end application.

Q: Will the slightly larger diameter of the API Delevan parts (0.455" vs. 0.453") cause PCB compatibility issues?

A: The 0.002" diameter difference is within standard PCB through-hole tolerance and does not affect mechanical fit or electrical performance. Both parts are axial-mounted with identical lead spacing and length (0.900"), ensuring compatibility with the original 5900-391 footprint.

Q: Why is the 5900-391 marked as obsolete?

A: The 5900-391 has been discontinued by Bourns Inc. The active equivalent 5900-391-RC is available as a direct replacement with identical specifications and improved compliance status.

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