CR75NP-331KC Equivalent & Substitute Parts

Part Overview

The CR75NP-331KC is a 330 µH unshielded drum core wirewound inductor manufactured by Sumida America Components Inc. This surface mount component is rated for 400 mA continuous current with a maximum DC resistance of 1.26 Ohm and operates across the temperature range of -40°C to 100°C. The part is classified as Active product status and is ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for this inductor category.

Substiute Parts

CR75NP-331KC

Sumida America Components Inc.In Stock: 912CR75NP-331KC Datasheet

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SDR0805-331KL

Bourns Inc.In Stock: 52250SDR0805-331KL Datasheet

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SDR7045-331K

Bourns Inc.In Stock: 9025SDR7045-331K Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CR75NP-331KC are qualified based on the following critical parameters:

Primary Matching Criteria:

• Inductance value: 330 µH (±10% tolerance)
• Core type: Ferrite, unshielded drum core wirewound
• Mounting: Surface mount
• Current rating: Minimum 400 mA
• DC resistance: Maximum 1.26 Ohm
• Compliance: ROHS3 compliant

Substitution Logic: Parts are considered equivalent when they maintain the specified inductance, support the required current rating, and operate within the temperature range of -40°C to 100°C. Mechanical package dimensions may vary within nonstandard specifications provided the parts are surface mountable. DC resistance and current saturation characteristics must not degrade circuit performance below the main part specifications.

Parameter Comparison

Engineering Selection Recommendations

SDR0805-331KL (Bourns Inc.): This substitute maintains identical inductance, current rating, and DC resistance specifications to the CR75NP-331KC. The extended operating temperature range to 125°C provides additional thermal margin. Both parts are ROHS3 compliant with MSL 1 rating. Physical dimensions differ slightly (7.80mm x 7.80mm vs. 7.80mm x 7.00mm), with SDR0805-331KL seated height of 5.30mm compared to 5.50mm for the main part. This substitute is suitable for direct replacement in applications where the dimensional variation is accommodated by the PCB layout.

SDR7045-331K (Bourns Inc.): This substitute provides 330 µH inductance with a higher current rating of 420 mA and marginally lower DC resistance of 1.24 Ohm maximum. The extended operating temperature range to 125°C and higher self-resonant frequency of 6 MHz offer performance advantages. Physical dimensions are more compact (7.00mm x 7.00mm with 4.80mm seated height). ROHS3 compliance and MSL 1 rating are maintained. This substitute is suitable for applications requiring improved thermal performance or higher current headroom.

Both substitute parts are Active status products from an established manufacturer with full compliance certifications matching the original part.

Frequently Asked Questions (FAQ)

Q: Can SDR0805-331KL replace CR75NP-331KC in all applications? A: SDR0805-331KL maintains the same inductance value, current rating, and DC resistance as CR75NP-331KC. The primary difference is physical dimensions and extended temperature range to 125°C. Substitution is valid provided PCB layout accommodates the dimensional variation (7.80mm x 7.80mm footprint vs. 7.80mm x 7.00mm).

Q: What is the advantage of SDR7045-331K over the main part? A: SDR7045-331K offers a higher current rating of 420 mA versus 400 mA, lower DC resistance of 1.24 Ohm maximum, and a higher self-resonant frequency of 6 MHz. The extended operating temperature range to 125°C provides additional thermal margin. Physical dimensions are more compact at 7.00mm x 7.00mm.

Q: Are all three parts ROHS3 compliant? A: Yes. CR75NP-331KC, SDR0805-331KL, and SDR7045-331K are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level.

Q: What is the impact of different self-resonant frequencies? A: Self-resonant frequency indicates the frequency at which the inductor transitions from inductive to capacitive behavior. CR75NP-331KC operates at 4.3 MHz, SDR0805-331KL at 4 MHz, and SDR7045-331K at 6 MHz. Selection depends on the application frequency range and filtering requirements.

Q: Can I use SDR7045-331K in a circuit designed for 400 mA maximum current? A: Yes. SDR7045-331K is rated for 420 mA continuous current, which exceeds the 400 mA requirement. The lower DC resistance of 1.24 Ohm also reduces power dissipation compared to the 1.26 Ohm maximum of CR75NP-331KC.

Q: What are the packaging considerations for these parts? A: All three parts are supplied in Tape & Reel (TR) packaging for automated assembly. Physical dimensions vary: CR75NP-331KC is 7.80mm x 7.00mm x 5.50mm (seated height), SDR0805-331KL is 7.80mm x 7.80mm x 5.30mm, and SDR7045-331K is 7.00mm x 7.00mm x 4.80mm. Verify PCB footprint compatibility before substitution.