Bourns 5729 100µH Toroidal Inductor Equivalent & Substitute Parts

Part Overview

The Bourns 5729 is a 100µH unshielded toroidal inductor rated for 2.5A continuous current with 80mOhm maximum DC resistance, designed for through-hole mounting in radial vertical orientation. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. The 5700 series toroidal inductors serve applications requiring compact form factors with controlled inductance values and current handling capabilities in the 2-3A range.

Key Parameters

Parameter	Value
Inductance	100 µH
Current Rating	2.5 A
DC Resistance (DCR)	80 mOhm Max
Tolerance	±15%
Core Material	Iron Powder
Shielding	Unshielded
Mounting Type	Through Hole
Package Type	Radial, Vertical (Open)
Operating Temperature	-55°C ~ 105°C

Substitute Part Grouping Explanation

Substitution eligibility for the Bourns 5729 is determined by the following critical parameters:

Primary Criteria (Must Match):

Inductance value: 100 µH
Package type: Radial, Vertical (Open) through-hole configuration
Shielding classification: Unshielded

Secondary Criteria (Allowable Variance):

Current rating: Minimum 2.5A (higher ratings acceptable)
DC resistance: Maximum 80mOhm (lower values acceptable)
Tolerance: ±15% or tighter (±20% acceptable with design verification)
Core material: Iron powder preferred for performance consistency
Operating temperature range: Must encompass -55°C to 105°C minimum

The substitute parts listed below satisfy these criteria within acceptable engineering tolerances for direct replacement in equivalent circuit applications.

Parameter Comparison

Parameter	Bourns 5729	Bourns 5729-RC	Pulse Electronics PE-92102NL
Inductance	100 µH	100 µH	100 µH
Current Rating (Amps)	2.5 A	2.5 A	2.6 A
DC Resistance (DCR)	80 mOhm Max	80 mOhm Max	100 mOhm Max
Tolerance	±15%	±15%	±20%
Core Material	Iron Powder	Iron Powder	Not specified
Shielding	Unshielded	Unshielded	Unshielded
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C	-40°C ~ 130°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package Type	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 5729-RC is the primary substitute for the obsolete Bourns 5729. Both components share identical electrical specifications (100µH, 2.5A, 80mOhm DCR, ±15% tolerance) and core material composition. The 5729-RC is actively manufactured and ROHS3 compliant, addressing regulatory requirements for new production. Physical dimensions differ slightly (0.850" Dia x 0.360" W versus 0.875" Dia x 0.437" W), requiring PCB layout verification for space-constrained applications. The 5729-RC is available in bulk packaging, supporting high-volume manufacturing.

Pulse Electronics PE-92102NL serves as a secondary substitute where supply constraints or specific sourcing requirements necessitate an alternative manufacturer. This component exceeds the original specifications in current rating (2.6A versus 2.5A) and operating temperature range (-40°C to 130°C versus -55°C to 105°C). The PE-92102NL exhibits higher DC resistance (100mOhm maximum versus 80mOhm) and wider inductance tolerance (±20% versus ±15%), requiring circuit-level analysis to confirm acceptable performance margins. This part is ROHS3 compliant and actively produced.

Selection between the two substitutes depends on design constraints: choose 5729-RC for direct electrical equivalence and minimal design impact; select PE-92102NL when alternative sourcing or extended temperature operation is required, subject to circuit validation.

Frequently Asked Questions (FAQ)

Q: Can the Bourns 5729-RC directly replace the obsolete Bourns 5729 without circuit modification?

A: Yes. The 5729-RC maintains identical inductance (100µH), current rating (2.5A), DC resistance (80mOhm maximum), tolerance (±15%), and core material (iron powder). Physical dimensions vary slightly; verify PCB footprint clearance before implementation.

Q: What are the key differences between the Bourns 5729-RC and Pulse Electronics PE-92102NL?

A: The 5729-RC matches the original 5729 specifications exactly. The PE-92102NL offers higher current capacity (2.6A), extended temperature range (-40°C to 130°C), but exhibits higher DC resistance (100mOhm) and wider tolerance (±20%). Circuit analysis is required to confirm PE-92102NL suitability for applications with tight inductance or power dissipation requirements.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both the Bourns 5729-RC and Pulse Electronics PE-92102NL are ROHS3 compliant. The original Bourns 5729 is non-compliant, making substitution necessary for regulatory compliance in new designs.

Q: What packaging formats are available for these substitute parts?

A: The Bourns 5729-RC is supplied in bulk packaging. The Pulse Electronics PE-92102NL is supplied in tray packaging. Confirm packaging compatibility with assembly equipment and procurement workflows.

Q: Can the PE-92102NL be used in applications requiring the original -55°C lower temperature limit?

A: No. The PE-92102NL operates from -40°C minimum, which does not satisfy the original -55°C to 105°C specification. Use only in applications where the -40°C to 130°C range is acceptable.

Q: How do the physical dimensions affect PCB layout?

A: The Bourns 5729 measures 0.875" Dia x 0.437" W; the 5729-RC measures 0.850" Dia x 0.360" W; the PE-92102NL measures 0.850" Dia x 0.410" W. All three use radial vertical through-hole mounting. Verify footprint spacing and clearance to adjacent components before design release.

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