IMS05WDST181J40 Equivalent & Substitute Parts

Part Overview

The IMS05WDST181J40 is a 180 µH shielded inductor manufactured by Vishay Dale, designed for through-hole applications requiring fixed inductance with moderate current handling. This component operates at 300 mA maximum current with a DC resistance of 3.6 Ohm maximum, suitable for filtering, energy storage, and signal conditioning circuits in industrial and consumer electronics applications.

The necessity to identify substitute parts arises from inventory constraints, supply chain discontinuities, or application-specific requirements where alternative specifications within acceptable tolerance ranges may be required.

Substiute Parts

IMS05WDST181J40

Vishay DaleIn Stock: 816IMS05WDST181J40 Datasheet

Current PartRFQ

IMS5SWDER181K65

Vishay DaleIn Stock: 722IMS5SWDER181K65 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the IMS05WDST181J40 is determined by the following critical parameters:

• Inductance Value: Must be 180 µH (no tolerance deviation permitted for direct substitution)
• Current Rating: Substitute must support minimum 300 mA; higher ratings are acceptable
• DC Resistance: Substitute maximum DC resistance must not exceed 3.6 Ohm to maintain circuit performance
• Package Configuration: Through-hole axial format required for mechanical compatibility
• Shielding Requirement: Shielded construction mandatory to prevent electromagnetic interference

The IMS5SWDER181K65 qualifies as a substitute part within the Vishay Dale product family, maintaining the same inductance specification and shielded axial configuration while operating within acceptable parameter ranges for equivalent circuit functionality.

Parameter Comparison

Engineering Selection Recommendations

The IMS5SWDER181K65 serves as a functional equivalent for applications where the IMS05WDST181J40 is unavailable. Selection between these parts requires evaluation of circuit-specific constraints:

Current Capacity Consideration: The substitute part operates at 260 mA maximum, which is 40 mA lower than the primary part. Applications operating at or near 300 mA maximum current should retain the IMS05WDST181J40 to maintain design margin.

DC Resistance Impact: The substitute exhibits 0.8 Ohm higher DC resistance (4.4 Ohm versus 3.6 Ohm). In circuits sensitive to resistive losses or thermal dissipation, this difference may affect performance. Power dissipation increases proportionally with the resistance increase at equivalent current levels.

Mechanical Compatibility: Both parts maintain through-hole axial configuration, ensuring direct board-level substitution without layout modification.

Shielding Performance: Both parts provide shielded construction. The molded variant in the substitute may offer enhanced mechanical robustness in high-vibration environments.

Frequently Asked Questions (FAQ)

Q: Can IMS5SWDER181K65 replace IMS05WDST181J40 in all applications?

A: Direct substitution is valid for circuits operating below 260 mA. Applications requiring the full 300 mA rating or sensitive to the additional 0.8 Ohm DC resistance require circuit re-evaluation before substitution.

Q: What is the impact of increased DC resistance on circuit performance?

A: Higher DC resistance increases power dissipation (P = I²R) and voltage drop across the inductor. In filtering applications, this may reduce attenuation effectiveness. In energy storage circuits, thermal losses increase proportionally.

Q: Are both parts mechanically interchangeable on the PCB?

A: Yes. Both parts use through-hole axial packaging and maintain compatible physical dimensions for direct board-level substitution without layout changes.

Q: What does "shielded molded" construction mean for the substitute part?

A: Shielded molded construction encapsulates the inductor core and windings in a protective molded compound, providing electromagnetic shielding and mechanical protection. This differs from the standard shielded design but maintains equivalent shielding performance for EMI suppression.

Q: Should I test the substitute before production implementation?

A: Circuit validation should confirm that the 260 mA current rating and 4.4 Ohm DC resistance remain within acceptable operating parameters for the specific application.