CDRR157NP-330MC Equivalent & Substitute Parts

Part Overview

The CDRR157NP-330MC is a 33 µH shielded inductor manufactured by Sumida America Components Inc., designed for surface mount applications requiring fixed inductance in compact form factors. This component is rated for 2.7 A continuous current with a maximum DC resistance of 69 mOhm and operates across the temperature range of -40°C to 100°C. The part maintains Active product status and is RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Substitute components are identified when equivalent electrical performance can be maintained within the specified parameter tolerances while accommodating standard component availability and supply chain requirements.

Substiute Parts

CDRR157NP-330MC

Sumida America Components Inc.In Stock: 1033CDRR157NP-330MC Datasheet

Current PartRFQ

SRR1806-330M

Bourns Inc.In Stock: 1623SRR1806-330M Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the CDRR157NP-330MC are qualified based on the following criteria:

Electrical Parameter Alignment:

• Inductance value must equal 33 µH within the ±20% tolerance band
• Current rating must support the 2.7 A continuous requirement
• DC resistance should not significantly exceed the 69 mOhm maximum to maintain thermal performance
• Saturation current must accommodate transient current conditions

Physical and Mechanical Compatibility:

• Surface mount mounting type required for PCB assembly compatibility
• Package dimensions must fit within the nonstandard form factor constraints (18.50mm L × 15.00mm W × 7.00mm H maximum)
• Shielded construction required for electromagnetic containment

Regulatory and Environmental Compliance:

• RoHS3 compliance mandatory
• Operating temperature range must encompass or exceed -40°C to 100°C
• Moisture sensitivity level MSL 1 (unlimited) acceptable

Supply and Availability:

• Active product status ensures ongoing availability
• Packaging in Tape & Reel (TR) format for automated assembly

Parameter Comparison

Engineering Selection Recommendations

Primary Component (CDRR157NP-330MC): The CDRR157NP-330MC remains the specified component for applications requiring the full 2.7 A continuous current rating and 69 mOhm maximum DC resistance. Active product status and established supply chain support this selection for new designs and ongoing production.

Substitute Component (SRR1806-330M): The SRR1806-330M by Bourns Inc. qualifies as a direct substitute when the following conditions are met:

• Circuit design accommodates the 2.5 A continuous current rating (0.2 A reduction from primary component)
• Thermal analysis accepts the 14 mOhm increase in DC resistance
• Extended operating temperature range to 125°C provides additional environmental margin
• PCB layout accommodates the 0.2 mm dimensional variance in length and height

Both components maintain RoHS3 compliance, MSL 1 rating, and Active product status. The substitute component provides higher saturation current (5.0 A versus 3.5 A), which may benefit applications with transient current conditions.

Selection Criteria:

• Use CDRR157NP-330MC when 2.7 A continuous current is mandatory
• Use SRR1806-330M when 2.5 A continuous current is acceptable and higher saturation margin is beneficial
• Verify PCB layout accommodates the minor dimensional differences before design release

Frequently Asked Questions (FAQ)

Q: Can the SRR1806-330M replace the CDRR157NP-330MC in all applications?

A: The SRR1806-330M is electrically compatible for applications where the 2.5 A continuous current rating meets circuit requirements. If the design requires the full 2.7 A rating, the primary component must be used. The 14 mOhm increase in DC resistance results in approximately 20% higher power dissipation at rated current; thermal analysis is required for high-temperature environments.

Q: What is the impact of the 14 mOhm DCR difference?

A: At 2.5 A continuous current, the SRR1806-330M dissipates approximately 0.52 W compared to 0.47 W for the CDRR157NP-330MC. This 0.05 W difference is typically negligible in most applications but should be verified in thermally constrained designs.

Q: Are the physical dimensions compatible with the PCB footprint?

A: The SRR1806-330M dimensions (18.30 × 14.00 × 7.10 mm) differ from the CDRR157NP-330MC (18.50 × 15.00 × 7.00 mm) by less than 0.2 mm in each axis. PCB layout must be verified to confirm the substitute component fits within the designated mounting area and clearance requirements.

Q: Do both components require identical handling and storage procedures?

A: Yes. Both components carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions. Standard surface mount component handling procedures apply to both parts.

Q: What is the significance of the higher saturation current in the substitute?

A: The SRR1806-330M saturation current of 5.0 A (versus 3.5 A for the primary component) provides greater margin before inductance degradation occurs. This is beneficial in applications experiencing transient current spikes or where circuit protection may not immediately limit overcurrent conditions.

Q: Are both components available in the same packaging format?

A: Yes. Both CDRR157NP-330MC and SRR1806-330M are supplied in Tape & Reel (TR) packaging, compatible with standard automated PCB assembly equipment.

Q: What compliance certifications apply to both components?

A: Both components are RoHS3 compliant and carry ECCN EAR99 classification. The SRR1806-330M additionally carries REACH Unaffected status. Both are classified under HTSUS 8504.50.4000.