Hammond Manufacturing 622U Equivalent & Substitute Parts

Part Overview

The Hammond Manufacturing 622U is a fixed wirewound inductor rated at 100 mH with a current rating of 9.3 mA and 49 Ohm DC resistance. This through-hole radial component features an unshielded design and operates at a self-resonant frequency of 15 kHz. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning.

Substiute Parts

622U

Hammond ManufacturingIn Stock: 885622U Datasheet

Current PartRFQ

RL181S-104J-RC

Bourns Inc.In Stock: 877RL181S-104J-RC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 622U is determined by the following critical parameters:

• Inductance Value: 100 mH (primary functional requirement)
• Current Rating: Minimum 9.3 mA (electrical performance threshold)
• Mounting Type: Through Hole (mechanical compatibility)
• Package / Case: Radial configuration (PCB layout compatibility)
• DC Resistance: Acceptable range dependent on circuit application tolerance
• Compliance: ROHS3 and REACH status alignment

The Bourns Inc. RL181S-104J-RC meets the core inductance, current rating, and mounting requirements. Variations in shielding, core material, DCR, and physical dimensions represent trade-offs that must be evaluated against specific circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

The Bourns RL181S-104J-RC qualifies as a functional substitute based on matching inductance value, through-hole mounting, and radial package configuration. Both parts maintain ROHS3 compliance and REACH unaffected status.

Key considerations for selection:

• Current Rating: The RL181S-104J-RC is rated at 9 mA versus the 622U at 9.3 mA. This represents a 3.2% reduction in current capacity and must be evaluated against actual circuit current requirements.
• DC Resistance: The RL181S-104J-RC exhibits 82 Ohm maximum DCR compared to 49 Ohm for the 622U. This 67% increase in resistance will affect power dissipation and circuit performance in applications sensitive to inductor losses.
• Shielding: The RL181S-104J-RC provides shielded construction versus the unshielded 622U. Shielding reduces electromagnetic interference but may alter frequency response characteristics in sensitive circuits.
• Physical Dimensions: The RL181S-104J-RC is significantly smaller (0.413" diameter versus 0.780" diameter), improving PCB space efficiency but requiring layout verification.
• Product Status: The RL181S-104J-RC is active production, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the RL181S-104J-RC directly replace the 622U in all applications?

A: Direct replacement requires circuit-level analysis. The RL181S-104J-RC maintains the same 100 mH inductance and through-hole radial mounting, but differs in current rating (9 mA vs. 9.3 mA), DC resistance (82 Ohm vs. 49 Ohm), and shielding. Applications with tight current or resistance specifications must be re-evaluated.

Q: What impact does the higher DC resistance of the RL181S-104J-RC have?

A: The 82 Ohm DCR of the RL181S-104J-RC versus 49 Ohm for the 622U increases power dissipation proportionally to the square of circuit current. In low-current applications, this difference may be negligible; in higher-current circuits, thermal performance and efficiency must be recalculated.

Q: Does the shielded design of the RL181S-104J-RC affect circuit performance?

A: Shielding reduces radiated electromagnetic interference but may introduce minor changes to frequency response and self-resonant characteristics. The RL181S-104J-RC exhibits a self-resonant frequency of 90 kHz versus 15 kHz for the 622U. Applications operating near these frequencies require frequency response analysis.

Q: Are there physical space constraints with the RL181S-104J-RC?

A: The RL181S-104J-RC is substantially smaller in diameter (0.413" versus 0.780") but slightly taller (0.551" versus 0.500"). PCB layout must be verified to confirm the smaller footprint is compatible with existing board designs and component spacing.

Q: What compliance certifications apply to both parts?

A: Both the 622U and RL181S-104J-RC are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component procurement.