4554R-221K Equivalent & Substitute Parts

Part Overview

The 4554R-221K is a 220 µH unshielded inductor manufactured by API Delevan Inc., rated for 640 mA continuous current with a maximum DC resistance of 650 mOhm. This through-hole radial inductor is actively produced and ROHS3 compliant. Identifying equivalent substitute parts is necessary for supply chain continuity, component obsolescence management, and availability optimization when the primary part reaches allocation constraints or discontinuation.

Substiute Parts

4554R-221K

API Delevan Inc.In Stock: 11724554R-221K Datasheet

Current PartRFQ

AIUR-03-221K

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 4554R-221K is determined by electrical and mechanical parameters that must align with circuit design requirements. The critical parameters governing substitution are:

Electrical Criteria:

• Inductance value of 220 µH within ±10% tolerance
• DC resistance of 650 mOhm maximum
• Current rating sufficient for continuous operation (minimum 640 mA for direct substitution)
• Q factor and self-resonant frequency characteristics matching or exceeding performance specifications
• Ferrite core material composition

Mechanical Criteria:

• Through-hole mounting compatibility
• Radial, vertical cylinder package form factor
• Physical dimensions compatible with circuit board layout constraints

Compliance & Environmental:

• ROHS3 compliance
• Operating temperature range encompassing application requirements

The AIUR-03-221K manufactured by Abracon LLC satisfies all critical electrical parameters with identical inductance (220 µH), matching DC resistance (650 mOhm), and equivalent frequency characteristics. The primary design difference is the current saturation rating (640 mA vs. 500 mA continuous), which establishes the substitution boundary.

Parameter Comparison

Engineering Selection Recommendations

Both the 4554R-221K and AIUR-03-221K maintain active product status and achieve ROHS3 compliance, confirming regulatory alignment for current manufacturing standards. The choice between these parts depends on application current requirements:

The 4554R-221K provides 640 mA continuous current rating and is the preferred selection for applications requiring maximum continuous load capacity within the 220 µH inductance class.

The AIUR-03-221K supports 500 mA continuous current with 640 mA saturation rating, establishing it as a functional equivalent for applications requiring up to 500 mA continuous operation. The saturation characteristic at 640 mA provides transient headroom for brief current excursions above the continuous rating.

Physical dimensions differ by approximately 0.35 mm in diameter and 0.39 mm in height. Board layout verification is required when substituting to confirm clearance and routing compatibility within the PCB design envelope.

Temperature range divergence (-40°C lower limit on primary part versus -25°C on substitute) must be evaluated against application environmental specifications.

Frequently Asked Questions (FAQ)

Q: Can the AIUR-03-221K substitute for the 4554R-221K in all applications?

A: Substitution compatibility depends on circuit current requirements. At continuous currents up to 500 mA, the AIUR-03-221K is electrically equivalent. Applications requiring continuous operation above 500 mA must use the 4554R-221K due to its 640 mA current rating.

Q: What are the physical dimension differences between these parts?

A: The AIUR-03-221K measures 0.354" (9.00 mm) diameter and 0.472" (12.00 mm) height, compared to the 4554R-221K at 0.340" (8.64 mm) diameter and 0.433" (11.00 mm) height. PCB layout clearances must accommodate the larger substitute part.

Q: Are both parts ROHS3 compliant?

A: Yes. Both the 4554R-221K and AIUR-03-221K carry ROHS3 compliance certification, satisfying current regulatory manufacturing requirements.

Q: What is the significance of the saturation current specification on the AIUR-03-221K?

A: The 640 mA saturation rating indicates the current level at which magnetic core saturation occurs. This parameter allows operation above the 500 mA continuous rating for brief transient periods without core damage, provided thermal limits are not exceeded.

Q: Do both inductors operate across the same temperature range?

A: The 4554R-221K operates from -40°C to 85°C, while the AIUR-03-221K operates from -25°C to 85°C. Applications requiring operation below -25°C must use the 4554R-221K.

Q: Is the DC resistance identical between both parts?

A: Yes. Both inductors specify a maximum DC resistance of 650 mOhm, maintaining equivalent power dissipation characteristics and impedance behavior at DC and low frequencies.