Bourns 5728 50µH Toroidal Inductor Equivalent & Substitute Parts

Part Overview

The Bourns 5728 is a 50µH unshielded toroidal inductor rated for 2.5A continuous current with 60mOhm maximum DC resistance. This through-hole component features an iron powder core and operates across the -55°C to 105°C temperature range. The 5728 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Inductance	50 µH
Current Rating	2.5 A
DC Resistance (Max)	60 mOhm
Tolerance	±15%
Core Material	Iron Powder
Shielding	Unshielded
Mounting Type	Through Hole
Package Type	Radial, Vertical (Open)
Operating Temperature	-55°C to 105°C

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Inductance Value: Must be 50µH (exact match required)
Current Rating: Must meet or exceed 2.5A
DC Resistance: Must not exceed 60mOhm maximum
Core Type: Iron powder core
Shielding: Unshielded configuration
Mounting: Through-hole radial vertical orientation
Package: Radial, Vertical (Open) form factor

The identified substitutes meet these core electrical and mechanical requirements while offering improved product status and compliance certifications.

Parameter Comparison

Parameter	Bourns 5728	Bourns 5728-RC	Pulse Electronics PE-92101NL
Inductance	50 µH	50 µH	50 µH
Current Rating (Amps)	2.5 A	2.5 A	2.6 A
DC Resistance (Max)	60 mOhm	60 mOhm	71 mOhm
Tolerance	±15%	±15%	±20%
Operating Temperature	-55°C to 105°C	-55°C to 105°C	-40°C to 130°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Vertical (Open)	Radial, Vertical (Open)	Radial, Vertical (Open)
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Bourns 5728-RC is the primary substitute for the obsolete Bourns 5728. Both parts share identical electrical specifications (50µH, 2.5A, 60mOhm DCR, ±15% tolerance) and thermal operating range. The 5728-RC is actively manufactured and ROHS3 compliant, addressing the obsolescence and regulatory compliance limitations of the original part. Packaging differs (bulk vs. original), but electrical and mechanical compatibility is direct.

Pulse Electronics PE-92101NL serves as an alternative substitute when the 5728-RC is unavailable. This part meets the core inductance and current requirements with a 2.6A rating and maintains the 50µH specification. The PE-92101NL exhibits slightly higher DC resistance (71mOhm vs. 60mOhm) and wider tolerance (±20% vs. ±15%), which may impact circuit performance in applications with tight impedance budgets. The extended operating temperature range (-40°C to 130°C) provides broader thermal coverage. ROHS3 compliance and active production status support long-term availability.

Selection should prioritize the 5728-RC for direct electrical equivalence. The PE-92101NL is suitable where the higher DCR and tolerance variance are acceptable within circuit design margins.

Frequently Asked Questions (FAQ)

Q: Can the Bourns 5728-RC directly replace the obsolete 5728?

A: Yes. The 5728-RC is electrically and mechanically equivalent with identical inductance (50µH), current rating (2.5A), DC resistance (60mOhm), tolerance (±15%), and operating temperature range (-55°C to 105°C). The primary difference is product status (active vs. obsolete) and RoHS compliance.

Q: What are the limitations of the Pulse Electronics PE-92101NL as a substitute?

A: The PE-92101NL meets the 50µH inductance and exceeds the 2.5A current requirement at 2.6A. However, it exhibits 71mOhm maximum DC resistance (11mOhm higher than the 5728) and ±20% tolerance (wider than ±15%). These differences may affect circuit performance in applications with strict impedance specifications. The lower operating temperature minimum (-40°C vs. -55°C) may also be a constraint in extreme cold environments.

Q: Are there package or form factor differences between these parts?

A: All three parts share the same through-hole radial vertical (open) package configuration. Physical dimensions vary slightly: the 5728 measures 0.875" diameter, the 5728-RC measures 0.750" diameter, and the PE-92101NL measures 0.700" diameter. These dimensional differences may require PCB layout verification for mechanical fit.

Q: Which substitute should I select for new designs?

A: The Bourns 5728-RC is the recommended choice for new designs due to direct electrical equivalence and active manufacturing status. The PE-92101NL is a secondary option when the 5728-RC is unavailable and circuit design margins accommodate the higher DCR and tolerance specifications.

Q: Are both substitutes RoHS compliant?

A: Yes. Both the Bourns 5728-RC and Pulse Electronics PE-92101NL are ROHS3 compliant, addressing regulatory requirements that the obsolete 5728 does not meet.

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