4554-331K Equivalent & Substitute Parts

Part Overview

The 4554-331K is a 330 µH unshielded inductor manufactured by API Delevan Inc., rated for 540 mA with a maximum DC resistance of 900mOhm. This through-hole radial component operates across -40°C to 85°C and is currently in active production status with 787 units in stock. Substitute parts become necessary when addressing supply constraints, extended temperature range requirements, or compliance specifications for specific applications.

Substiute Parts

4554-331K

API Delevan Inc.In Stock: 8694554-331K Datasheet

Current PartRFQ

RL622-331K-RC

Bourns Inc.In Stock: 7464RL622-331K-RC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The RL622-331K-RC from Bourns Inc. qualifies as a direct substitute based on the following critical parameters:

• Inductance Match: Both parts specify 330 µH with ±10% tolerance
• Current Rating Match: Both rated for 540 mA
• Core Material Match: Both use ferrite core construction
• Shielding Match: Both are unshielded
• Mounting Match: Both are through-hole radial, vertical cylinder packages
• Frequency Characteristics Match: Both measure Q @ 20 at 796kHz with 2.3MHz self-resonant frequency
• Physical Dimensions: Diameter 8.50mm (RL622) vs 8.64mm (4554), height 11.00mm (both)
• DC Resistance: RL622 at 850mOhm Max is lower than 4554 at 900mOhm Max, providing improved performance margin

The RL622-331K-RC operates across -55°C to 105°C, extending the lower and upper temperature limits beyond the 4554-331K specification.

Parameter Comparison

Engineering Selection Recommendations

4554-331K Selection: Choose this part when the original design specification requires the API Delevan inductor and supply availability is confirmed. This part remains in active production with adequate inventory.

RL622-331K-RC Selection: This substitute is appropriate when:

• Extended temperature range operation (-55°C to 105°C) is required beyond the 4554-331K specification
• ROHS3 compliance is mandated for the application
• Lower DC resistance (850mOhm vs 900mOhm) provides performance advantage
• Supply of the 4554-331K is constrained; RL622 inventory is significantly higher (7390 units)

Both parts maintain identical electrical performance at the specified operating points. Physical dimensions are compatible with standard through-hole PCB layouts for radial inductors.

Frequently Asked Questions (FAQ)

Q: Can RL622-331K-RC directly replace 4554-331K in existing designs?

A: Yes. Both parts share identical inductance (330 µH), current rating (540 mA), tolerance (±10%), core material (ferrite), shielding (unshielded), and frequency characteristics (Q @ 20 at 796kHz, 2.3MHz self-resonant frequency). Physical dimensions are compatible with standard radial through-hole mounting. The RL622 offers lower DC resistance and extended temperature range.

Q: What is the difference in DC resistance between these parts?

A: The 4554-331K specifies 900mOhm maximum DC resistance, while the RL622-331K-RC specifies 850mOhm maximum. The lower resistance of the RL622 reduces power dissipation and heat generation in the inductor.

Q: Does the RL622-331K-RC fit the same PCB footprint?

A: Yes. Both parts use radial, vertical cylinder packages with identical height (0.433" / 11.00mm). Diameter difference is minimal (8.64mm vs 8.50mm), well within standard through-hole PCB tolerances for radial component mounting.

Q: What compliance difference exists between these parts?

A: The 4554-331K is RoHS non-compliant. The RL622-331K-RC is ROHS3 compliant. Select the RL622 when RoHS3 certification is required for the end application.

Q: Are the temperature operating ranges interchangeable?

A: No. The 4554-331K operates -40°C to 85°C. The RL622-331K-RC operates -55°C to 105°C. The RL622 extends both lower and upper temperature limits. Use the RL622 when extended temperature operation is required.

Q: Do both parts have the same Q factor?

A: Yes. Both parts specify Q @ 20 at 796kHz test frequency with 2.3MHz self-resonant frequency, indicating equivalent frequency response characteristics.