4554-221K Fixed Inductor Equivalent & Substitute Parts

Part Overview

The 4554-221K is a 220 µH unshielded through-hole inductor manufactured by API Delevan Inc., designed for applications requiring fixed inductance in radial, vertical cylinder configuration. This Active product features a ferrite core with 640 mA current rating and 650mOhm maximum DC resistance. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within specified parameter tolerances, enabling procurement flexibility and supply chain continuity.

Substiute Parts

4554-221K

API Delevan Inc.In Stock: 8204554-221K Datasheet

Current PartRFQ

AIUR-03-221K

Abracon LLCIn Stock: 1672AIUR-03-221K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 4554-221K are identified based on strict electrical and mechanical parameter alignment. The substitution logic requires:

Electrical Parameters (Must Match):

• Inductance value: 220 µH within ±10% tolerance
• DC Resistance: 650mOhm maximum (no exceedance permitted)
• Q factor: 20 @ 796kHz (performance consistency)
• Self-resonant frequency: 2.7MHz (frequency response alignment)

Mechanical Parameters (Must Match):

• Mounting type: Through Hole configuration
• Package style: Radial, Vertical Cylinder
• Core material: Ferrite

Current Rating Consideration: Substitute parts must support minimum 640 mA continuous current. Parts with saturation current (Isat) specifications must demonstrate capability at or above this threshold.

Operating Temperature: Substitute parts must support the application temperature range or a compatible subset thereof.

Parameter Comparison

Engineering Selection Recommendations

AIUR-03-221K Substitution Criteria:

The AIUR-03-221K from Abracon LLC qualifies as a functional substitute for the 4554-221K based on matched electrical parameters: identical inductance (220 µH ±10%), DC resistance (650mOhm Max), Q factor (20 @ 796kHz), and self-resonant frequency (2.7MHz). Both components feature through-hole mounting in radial, vertical cylinder configuration with ferrite cores.

Limitations and Considerations:

1. Current Rating Differential: The AIUR-03-221K is rated for 500 mA continuous current versus 640 mA for the 4554-221K. The substitute specifies 640mA saturation current (Isat), indicating capability at this level but not as continuous rating. Applications requiring sustained 640 mA operation must evaluate this distinction.

2. Operating Temperature Range: The AIUR-03-221K operates within -25°C ~ 85°C, narrower than the 4554-221K range of -40°C ~ 85°C. Applications requiring operation below -25°C require the original part.

3. Physical Dimensions: Minor dimensional variations exist (diameter 0.354" vs 0.340"; height 0.472" vs 0.433"). PCB layout and mechanical clearance must be verified.

4. Compliance Status: The AIUR-03-221K is ROHS3 compliant, whereas the 4554-221K is RoHS non-compliant. Applications with RoHS compliance requirements must use the substitute.

Selection Logic:

• Use 4554-221K for applications requiring -40°C minimum temperature operation or sustained 640 mA current in non-RoHS environments
• Use AIUR-03-221K for RoHS-compliant applications within -25°C ~ 85°C range with current requirements at or below 500 mA continuous

Frequently Asked Questions (FAQ)

Q: Can AIUR-03-221K replace 4554-221K in all applications?

A: No. The AIUR-03-221K has a lower continuous current rating (500 mA vs 640 mA) and narrower operating temperature range (-25°C ~ 85°C vs -40°C ~ 85°C). Verify application requirements before substitution.

Q: What does the saturation current specification on AIUR-03-221K indicate?

A: The 640mA Isat specification indicates the current level at which the inductor's inductance begins to degrade due to core saturation. This differs from continuous current rating, which specifies safe sustained operation.

Q: Are the physical dimensions compatible with existing PCB layouts?

A: Both parts use radial, vertical cylinder configuration with similar dimensions. However, the AIUR-03-221K is slightly larger (0.354" diameter, 0.472" height vs 0.340" diameter, 0.433" height). Verify PCB footprint clearances and lead spacing before substitution.

Q: Which part should be used for low-temperature applications?

A: The 4554-221K supports operation down to -40°C. The AIUR-03-221K minimum operating temperature is -25°C. For applications below -25°C, the 4554-221K is required.

Q: Does RoHS compliance affect electrical performance?

A: No. RoHS compliance status reflects manufacturing process and material composition, not electrical characteristics. Both parts deliver equivalent inductance, resistance, and frequency response.

Q: What is the significance of matching Q factor and self-resonant frequency?

A: Q factor (20 @ 796kHz) and self-resonant frequency (2.7MHz) determine inductor performance in AC circuits. Matching these parameters ensures equivalent behavior in filtering, tuning, and impedance matching applications.

Q: Can these inductors be used interchangeably in high-frequency circuits?

A: Yes, provided the application current requirements do not exceed the substitute part's continuous rating and operating temperature range is compatible. The matched Q factor and self-resonant frequency ensure equivalent high-frequency performance.