CDH74NP-330KC Equivalent & Substitute Parts

Part Overview

The CDH74NP-330KC is a 33 µH unshielded drum core wirewound inductor manufactured by Sumida America Components Inc. This surface mount component is rated for 1.45 A continuous current with a maximum DC resistance of 170mOhm and operates across the temperature range of -40°C to 100°C. The part is Active in product status and ROHS3 compliant, making it suitable for modern electronic applications requiring fixed inductance in compact form factors.

Equivalent and substitute parts are identified when alternative components share the same inductance value, core type, mounting technology, and operating parameters within acceptable engineering tolerances. Substitutes enable design flexibility, inventory optimization, and supply chain continuity.

Substiute Parts

CDH74NP-330KC

Sumida America Components Inc.In Stock: 1146CDH74NP-330KC Datasheet

Current PartRFQ

SDR7045-330M

Bourns Inc.In Stock: 3646SDR7045-330M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CDH74NP-330KC is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 33 µH (exact match required)
• Core type: Drum core, wirewound construction
• Core material: Ferrite
• Shielding configuration: Unshielded
• Mounting technology: Surface mount

Secondary Compatibility Parameters:

• Current rating: Substitute must support minimum 1.45 A
• DC resistance: Substitute maximum DCR must not exceed application thermal limits
• Operating temperature range: Substitute range must encompass or exceed -40°C to 100°C
• Compliance: ROHS3 compliance required for regulatory alignment
• Moisture sensitivity: MSL 1 classification acceptable

The SDR7045-330M from Bourns Inc. qualifies as a substitute based on matching inductance, core type, core material, shielding, and surface mount configuration. Variations in tolerance, current saturation specifications, and physical dimensions are within acceptable engineering parameters for equivalent component selection.

Parameter Comparison

Engineering Selection Recommendations

CDH74NP-330KC Selection Criteria:

• Applications requiring current ratings up to 1.45 A
• Operating temperature range limited to -40°C to 100°C
• Inductance tolerance of ±10% is acceptable
• Sumida supply chain availability is prioritized

SDR7045-330M Selection Criteria:

• Applications with current requirements up to 1.22 A
• Extended operating temperature range to 125°C is beneficial
• Lower DC resistance (150mOhm vs 170mOhm) reduces power dissipation
• Smaller physical footprint (7.00mm x 7.00mm vs 8.00mm x 7.30mm) accommodates space-constrained layouts
• Bourns supply chain availability is prioritized
• Wider inductance tolerance (±20%) is acceptable for the application

Both parts maintain Active product status and ROHS3 compliance. Selection between the two components depends on current rating requirements, thermal operating conditions, physical space constraints, and supply chain considerations. The Bourns SDR7045-330M is suitable as a substitute when current demand does not exceed 1.22 A and the extended temperature capability or reduced footprint provides design advantage.

Frequently Asked Questions (FAQ)

Q: Can SDR7045-330M replace CDH74NP-330KC in all applications?

A: No. The SDR7045-330M has a maximum current rating of 1.22 A, compared to 1.45 A for the CDH74NP-330KC. Substitution is valid only for applications where the inductor current does not exceed 1.22 A. Verify actual circuit current requirements before substitution.

Q: What is the impact of the inductance tolerance difference (±10% vs ±20%)?

A: The CDH74NP-330KC has tighter tolerance (±10%), providing inductance values between 29.7 µH and 36.3 µH. The SDR7045-330M tolerance of ±20% yields a range of 26.4 µH to 39.6 µH. Applications sensitive to inductance variation must account for this wider tolerance in the Bourns part.

Q: Are the physical dimensions compatible on the same PCB?

A: The SDR7045-330M (7.00mm x 7.00mm x 4.80mm) is smaller than the CDH74NP-330KC (8.00mm x 7.30mm x 5.20mm). The Bourns part fits in the same footprint area but with reduced height. Verify PCB layout and clearance requirements before substitution. No design modification is required if the original layout accommodates the smaller component.

Q: Do both parts meet the same compliance standards?

A: Yes. Both CDH74NP-330KC and SDR7045-330M are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity classification. Both are suitable for applications with equivalent regulatory requirements.

Q: What is the significance of the lower DC resistance in the SDR7045-330M?

A: The SDR7045-330M has 150mOhm maximum DCR compared to 170mOhm for the CDH74NP-330KC. Lower DCR reduces resistive power loss (I²R), resulting in lower heat generation and improved thermal performance. This is advantageous in high-current or thermally constrained applications.

Q: Can the CDH74NP-330KC operate at 125°C?

A: No. The CDH74NP-330KC operating temperature range is -40°C to 100°C. Applications requiring operation above 100°C must use the SDR7045-330M, which supports -40°C to 125°C.

Q: Are there any electrical performance differences beyond the listed parameters?

A: The SDR7045-330M provides additional electrical characterization: saturation current (Isat) of 1.32 A, Q factor of 20 at 2.52 MHz, and self-resonant frequency of 18 MHz. These parameters are not specified for the CDH74NP-330KC. Applications requiring these specifications should reference the Bourns datasheet directly.