4554-681K Equivalent & Substitute Parts

Part Overview

The 4554-681K is a fixed unshielded inductor manufactured by API Delevan Inc., rated at 680 µH inductance with a maximum current rating of 380 mA and DC resistance of 1.6Ohm. This through-hole radial component operates across a temperature range of -40°C to 85°C and is currently in active production status. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the same inductance value, current rating, DC resistance, and package form factor.

Substiute Parts

4554-681K

API Delevan Inc.In Stock: 8254554-681K Datasheet

Current PartRFQ

RL622-681K-RC

Bourns Inc.In Stock: 1717RL622-681K-RC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The RL622-681K-RC from Bourns Inc. qualifies as a direct substitute based on the following critical parameters:

• Inductance value: 680 µH (identical)
• Tolerance: ±10% (identical)
• Current rating: 380 mA (identical)
• DC resistance: 1.6Ohm Max (identical)
• Shielding: Unshielded (identical)
• Mounting type: Through Hole (identical)
• Package form: Radial, Vertical Cylinder (identical)
• Core material: Ferrite (identical)
• Q factor and self-resonant frequency: 20 @ 796kHz and 1.6MHz (identical)

Physical dimensions are within acceptable tolerance for through-hole radial mounting applications.

Parameter Comparison

Engineering Selection Recommendations

Both the 4554-681K and RL622-681K-RC are active production components with identical electrical specifications and compatible mechanical form factors. The RL622-681K-RC offers an extended operating temperature range (-55°C to 105°C versus -40°C to 85°C) and ROHS3 compliance, making it suitable for applications requiring enhanced environmental performance or regulatory compliance. The 4554-681K remains appropriate for applications within its specified temperature range where RoHS compliance is not a requirement. Physical dimensions are compatible for standard through-hole PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can the RL622-681K-RC replace the 4554-681K in all applications?

A: Yes, provided the application operates within the 4554-681K temperature range of -40°C to 85°C. The RL622-681K-RC supports this range and extends beyond it. All electrical parameters are identical.

Q: Are there physical compatibility concerns between these parts?

A: No. Both components use identical radial, vertical cylinder packaging with matching height (0.433" / 11.00mm). Diameter difference (0.340" versus 0.335") is within standard PCB hole tolerance for through-hole mounting.

Q: Does RoHS compliance affect electrical performance?

A: No. RoHS compliance status does not alter the electrical characteristics. The RL622-681K-RC maintains identical inductance, current rating, DC resistance, and frequency response.

Q: What determines substitution eligibility for these inductors?

A: Substitution is based on matching inductance value (680 µH), tolerance (±10%), current rating (380 mA), DC resistance (1.6Ohm Max), shielding type (unshielded), core material (ferrite), mounting type (through-hole), and package form (radial, vertical cylinder).

Q: Can these parts be used interchangeably on existing PCBs?

A: Yes. Identical electrical specifications and compatible mechanical dimensions allow direct substitution without circuit redesign or PCB layout modification.