CDRH124NP-331MC Equivalent & Substitute Parts

Part Overview

The CDRH124NP-331MC is a 330 µH shielded surface mount inductor manufactured by Sumida America Components Inc. This fixed inductor is rated for 500 mA continuous current with a maximum DC resistance of 990 mOhm and operates across the temperature range of -40°C to 100°C. The component is classified as Active product status and is RoHS3 compliant. Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing, improved performance characteristics, or enhanced availability from qualified manufacturers.

Substiute Parts

CDRH124NP-331MC

Sumida America Components Inc.In Stock: 1146CDRH124NP-331MC Datasheet

Current PartRFQ

SRR1240-331K

Bourns Inc.In Stock: 6470SRR1240-331K Datasheet

DirectRFQ

DRA124-331-R

Eaton - Electronics DivisionIn Stock: 1868DRA124-331-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CDRH124NP-331MC are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Inductance value: 330 µH (exact match required)
• Inductance tolerance: ±20% or better
• Current rating: equal to or greater than 500 mA
• DC resistance: equal to or less than 990 mOhm
• Shielding: Shielded configuration
• Core material: Ferrite
• Mounting type: Surface Mount
• Package dimensions: compatible with 12.00 x 12.00 mm footprint and 4.50 mm maximum height
• Operating temperature: minimum -40°C to 100°C coverage
• RoHS3 compliance required

Substitute Parts Identified:

1. SRR1240-331K (Bourns Inc.) - Direct equivalent with enhanced current rating and improved tolerance
2. DRA124-331-R (Eaton - Electronics Division) - Similar specification with extended temperature range

Parameter Comparison

Engineering Selection Recommendations

SRR1240-331K (Bourns Inc.) - Primary Substitute:

The SRR1240-331K qualifies as a direct equivalent with superior electrical characteristics. This part exceeds the current rating requirement at 750 mA versus the original 500 mA specification, providing 50% additional current capacity. The DC resistance of 950 mOhm is lower than the 990 mOhm maximum of the CDRH124NP-331MC, resulting in reduced power dissipation. The inductance tolerance is improved to ±10% compared to ±20%, offering tighter specification control. Operating temperature extends to 125°C, providing enhanced thermal margin. All compliance requirements are met: ROHS3 compliant, MSL 1, and Active product status. The footprint dimensions of 12.50 x 12.50 mm represent a 0.50 mm increase in length and width while maintaining the 4.50 mm height, requiring PCB layout verification for space-constrained applications.

DRA124-331-R (Eaton - Electronics Division) - Secondary Substitute:

The DRA124-331-R provides an alternative with extended operating temperature range to 165°C and higher saturation current of 1.092 A. The DC resistance of 892 mOhm is superior to the original specification. Current rating of 690 mA exceeds the 500 mA requirement. Inductance tolerance matches the original at ±20%. This part carries AEC-Q200 automotive qualification, indicating suitability for automotive and high-reliability applications. RoHS3 compliance and MSL 1 rating are confirmed. Footprint dimensions match the SRR1240-331K at 12.50 x 12.50 mm with 4.50 mm height. Product status is Active.

Substitution Compatibility Summary:

Both substitute parts maintain the 330 µH inductance specification, shielded configuration, surface mount mounting type, and all regulatory compliance requirements. Electrical performance is equal to or superior to the original part across current rating and DC resistance parameters. PCB layout modifications are required for both substitutes due to the 0.50 mm increase in footprint dimensions. Temperature range extensions provide additional operational margin for both alternatives.

Frequently Asked Questions (FAQ)

Q: Can the SRR1240-331K be used as a direct replacement for the CDRH124NP-331MC without circuit redesign?

A: The SRR1240-331K is electrically compatible and superior in performance. However, the footprint dimensions increase from 12.00 x 12.00 mm to 12.50 x 12.50 mm. PCB layout verification is required to confirm adequate clearance in the component placement area. The 4.50 mm height remains unchanged, eliminating vertical clearance concerns.

Q: What is the significance of the inductance tolerance difference between ±20% and ±10%?

A: Inductance tolerance defines the acceptable range of actual inductance values around the nominal 330 µH specification. The ±20% tolerance of the CDRH124NP-331MC allows values between 264 µH and 396 µH. The ±10% tolerance of the SRR1240-331K restricts the range to 297 µH to 363 µH, providing tighter specification control and improved circuit performance predictability in applications sensitive to inductance variation.

Q: Are there thermal considerations when selecting between these three parts?

A: The CDRH124NP-331MC operates to 100°C maximum. The SRR1240-331K extends to 125°C, and the DRA124-331-R to 165°C. Selection depends on the application's thermal environment. For applications operating near or above 100°C, the SRR1240-331K or DRA124-331-R provide thermal margin. DC resistance values (990 mOhm, 950 mOhm, and 892 mOhm respectively) determine power dissipation at rated current, with lower resistance generating less heat.

Q: What does the MSL 1 (Unlimited) rating indicate?

A: Moisture Sensitivity Level 1 (Unlimited) indicates the component has no moisture sensitivity restrictions. These parts do not require special moisture control during storage, handling, or assembly. Standard PCB assembly processes are applicable without additional moisture bake-out procedures.

Q: Is the 0.50 mm footprint increase from 12.00 x 12.00 mm to 12.50 x 12.50 mm significant?

A: The 0.50 mm increase in both length and width represents a 4.2% dimensional increase. Significance depends on PCB layout density and component spacing. In high-density designs with minimal clearance, this increase may require layout modification. In standard density layouts with adequate spacing, the increase is typically accommodated without redesign.

Q: What is the difference between Drum Core, Wirewound and Wirewound inductor types?

A: The SRR1240-331K uses Drum Core, Wirewound construction, while the DRA124-331-R uses Wirewound construction. Both are shielded ferrite-based inductors. The specific construction type affects electromagnetic characteristics, Q factor, and frequency response. Both types meet the 330 µH inductance specification at 100 kHz test frequency.

Q: Are all three parts RoHS3 compliant?

A: Yes. The CDRH124NP-331MC, SRR1240-331K, and DRA124-331-R are all confirmed RoHS3 compliant. This compliance is maintained across all substitute selections, ensuring regulatory requirements are satisfied for applications subject to RoHS directives.

Q: What does AEC-Q200 qualification on the DRA124-331-R indicate?

A: AEC-Q200 is an automotive electronics council qualification standard for passive components. This certification indicates the DRA124-331-R has undergone rigorous testing for automotive applications, including thermal cycling, vibration, and reliability assessments. This qualification is relevant for automotive and high-reliability industrial applications.

Q: Can current rating differences affect circuit performance?

A: Current rating defines the maximum continuous current the inductor can handle without exceeding temperature limits. The CDRH124NP-331MC is rated 500 mA, while substitutes are rated 750 mA and 690 mA respectively. If circuit current remains at or below 500 mA, all three parts perform identically. If circuit current exceeds 500 mA but remains below the substitute rating, only the substitute parts are suitable. Exceeding any part's current rating causes excessive heating and potential failure.