Hammond Manufacturing 622S Fixed Inductor - Equivalent & Substitute Parts

Part Overview

The Hammond Manufacturing 622S is a 47 mH unshielded wirewound inductor rated for 13.7 mA with 27 Ohm DC resistance, designed for through-hole radial mounting. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The 622S operates at a self-resonant frequency of 16 kHz and is ROHS3 compliant.

Substiute Parts

622S

Hammond ManufacturingIn Stock: 1249622S Datasheet

Current PartRFQ

RL181S-473J-RC

Bourns Inc.In Stock: 8800RL181S-473J-RC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The Bourns Inc. RL181S-473J-RC qualifies as a substitute based on the following critical parameters:

Matching Parameters:

• Inductance: 47 mH (identical)
• Current Rating: 13 mA (622S rated 13.7 mA; RL181S rated 13 mA - within acceptable margin for through-hole radial inductors)
• Mounting Type: Through Hole (identical)
• Package / Case: Radial (identical)
• RoHS Status: ROHS3 Compliant (identical)

Differing Parameters:

• DC Resistance: 622S 27 Ohm vs. RL181S 52 Ohm Max (higher resistance in substitute)
• Tolerance: 622S ±2% vs. RL181S ±5% (wider tolerance in substitute)
• Shielding: 622S Unshielded vs. RL181S Shielded (substitute provides additional shielding)
• Self-Resonant Frequency: 622S 16 kHz vs. RL181S 120 kHz (higher in substitute)
• Physical Dimensions: 622S 0.780" Dia vs. RL181S 0.413" Dia (substitute is smaller)
• Product Status: 622S Obsolete vs. RL181S Active (substitute is currently manufactured)

Parameter Comparison

Engineering Selection Recommendations

The RL181S-473J-RC is an active production substitute for the obsolete 622S. Both components meet ROHS3 compliance and REACH unaffected status. The substitute maintains the critical 47 mH inductance specification and supports through-hole radial mounting on standard PCB layouts.

Selection of the RL181S-473J-RC requires evaluation of the following design considerations:

• The substitute exhibits higher DC resistance (52 Ohm Max vs. 27 Ohm), which will increase power dissipation in the inductor.
• The substitute provides shielded construction, which may alter electromagnetic coupling characteristics in the circuit.
• The substitute has a smaller physical footprint (0.413" diameter vs. 0.780" diameter), allowing for more compact board layouts.
• The substitute operates at a higher self-resonant frequency (120 kHz vs. 16 kHz), extending the usable frequency range.
• The substitute has a wider inductance tolerance (±5% vs. ±2%), which may impact circuit performance in tolerance-sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can the RL181S-473J-RC directly replace the 622S in existing designs?

A: The RL181S-473J-RC maintains the same 47 mH inductance and through-hole radial mounting configuration. However, the higher DC resistance and shielded construction may affect circuit performance. PCB layout modifications may be required due to the smaller physical dimensions of the substitute.

Q: What is the impact of the higher DC resistance in the RL181S-473J-RC?

A: The RL181S-473J-RC has a maximum DC resistance of 52 Ohm compared to the 622S at 27 Ohm. This nearly doubles the resistive losses in the inductor, resulting in increased heat generation and reduced circuit efficiency. Applications sensitive to power dissipation must account for this difference.

Q: Does the shielded construction of the RL181S-473J-RC affect compatibility?

A: The RL181S-473J-RC features shielded drum core construction, whereas the 622S is unshielded. Shielding reduces electromagnetic radiation and susceptibility to external fields. In circuits designed for unshielded inductors, the shielded substitute may alter coupling characteristics with adjacent components.

Q: Are there physical mounting differences between these parts?

A: Both components use through-hole radial mounting. The RL181S-473J-RC is significantly smaller (0.413" diameter vs. 0.780" diameter), allowing placement in tighter board areas. Height difference is minimal (0.551" vs. 0.500"), presenting no practical mounting constraint.

Q: What is the significance of the different self-resonant frequencies?

A: The 622S has a self-resonant frequency of 16 kHz, while the RL181S-473J-RC operates at 120 kHz. The higher self-resonant frequency of the substitute extends the frequency range over which the component behaves as a true inductor before parasitic capacitance dominates.

Q: How do the tolerance specifications compare?

A: The 622S offers ±2% inductance tolerance, while the RL181S-473J-RC provides ±5% tolerance. Applications requiring tighter inductance control may experience greater variation with the substitute. Circuit designs must accommodate the wider tolerance band of the RL181S-473J-RC.

Q: Are both components compliant with current regulations?

A: Both the 622S and RL181S-473J-RC are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and use.