CD75NP-121KC Equivalent & Substitute Parts

Part Overview

The CD75NP-121KC is a 120 µH unshielded surface mount inductor manufactured by Sumida America Components Inc. This fixed inductor is designed for applications requiring 660 mA current handling capability with a maximum DC resistance of 470mOhm. The component operates across the temperature range of -40°C to 100°C and is RoHS3 compliant. As an active product with 869 pieces in stock, substitute parts may be required for design flexibility, supply chain optimization, or application-specific performance requirements.

Substiute Parts

CD75NP-121KC

Sumida America Components Inc.In Stock: 903CD75NP-121KC Datasheet

Current PartRFQ

SDR0805-121KL

Bourns Inc.In Stock: 9373SDR0805-121KL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD75NP-121KC is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

• Inductance value: 120 µH with ±10% tolerance
• Current rating: 660 mA minimum
• DC resistance: Within acceptable operational limits (470mOhm reference)
• Core material: Ferrite
• Shielding configuration: Unshielded
• Surface mount package compatibility
• RoHS3 compliance

The SDR0805-121KL from Bourns Inc. meets all primary equivalence criteria. Both components share identical inductance specifications, current ratings, and core material composition. The substitute part demonstrates superior thermal performance with an extended operating temperature range (-40°C ~ 125°C versus -40°C ~ 100°C) and includes additional performance metrics (Q factor and self-resonant frequency specifications).

Parameter Comparison

Engineering Selection Recommendations

CD75NP-121KC (Primary Component): The CD75NP-121KC remains the specified component for applications where the original design parameters are maintained. This part is active, RoHS3 compliant, and carries MSL 1 rating. Selection is appropriate for standard operating conditions within the -40°C to 100°C range.

SDR0805-121KL (Substitute Component): The SDR0805-121KL from Bourns Inc. is a direct functional equivalent suitable for applications requiring extended thermal performance. The substitute part is active, RoHS3 compliant, and REACH unaffected. The extended operating temperature range (-40°C ~ 125°C) provides additional margin for thermal stress conditions. DC resistance specification (480mOhm Max) is within 2% of the primary component, maintaining equivalent power dissipation characteristics. Both components carry identical moisture sensitivity ratings and are packaged in Tape & Reel format.

Selection between these components should be based on supply availability, thermal operating requirements, and design margin preferences. Both parts satisfy the core electrical and mechanical requirements for 120 µH, 660 mA surface mount inductor applications.

Frequently Asked Questions (FAQ)

Q: Can the SDR0805-121KL directly replace the CD75NP-121KC in existing designs?

A: Yes. Both components share identical inductance values (120 µH ±10%), current ratings (660 mA), core material (ferrite), and shielding configuration (unshielded). Physical dimensions are compatible for surface mount PCB layouts. DC resistance values differ by 10mOhm (480mOhm versus 470mOhm), which represents a 2% variance and is within acceptable operational tolerance for most applications.

Q: What are the key differences between these two inductors?

A: The primary differences are manufacturer origin (Sumida versus Bourns), operating temperature range (100°C versus 125°C maximum), and physical footprint width (7.00mm versus 7.80mm). The Bourns substitute provides additional performance documentation including Q factor (12 @ 796kHz) and self-resonant frequency (6MHz). Height specifications are nearly identical (5.50mm versus 5.30mm).

Q: Are both parts RoHS3 compliant?

A: Yes. Both the CD75NP-121KC and SDR0805-121KL are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings, suitable for standard manufacturing and storage conditions.

Q: What is the significance of the DC resistance difference?

A: The DC resistance difference of 10mOhm (470mOhm versus 480mOhm) represents approximately 2% variance. This difference affects power dissipation at rated current. At 660 mA, the CD75NP-121KC dissipates approximately 0.206 watts while the SDR0805-121KL dissipates approximately 0.211 watts. This variance is typically negligible in most circuit applications but should be evaluated for thermally constrained designs.

Q: Can these parts be used interchangeably in high-frequency applications?

A: The SDR0805-121KL provides documented high-frequency performance specifications (Q @ 796kHz and 6MHz self-resonant frequency). The CD75NP-121KC does not include these specifications. For applications operating near or above 1 MHz, the Bourns substitute with documented frequency response characteristics may be preferred.

Q: What packaging format is used for both components?

A: Both components are supplied in Tape & Reel (TR) format, standard for automated surface mount assembly processes. This packaging format is compatible with standard pick-and-place equipment and reflow soldering procedures.