CDR74NP-121MC Equivalent & Substitute Parts

Part Overview

The CDR74NP-121MC is a 120 µH shielded surface mount inductor manufactured by Sumida America Components Inc., rated for 470 mA continuous current with a maximum DC resistance of 620 mOhm. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. Substitute parts must maintain the 120 µH inductance specification while accommodating variations in current rating, DC resistance, and physical dimensions within acceptable engineering tolerances.

Substiute Parts

CDR74NP-121MC

Sumida America Components Inc.In Stock: 961CDR74NP-121MC Datasheet

Current PartRFQ

CDRH74NP-121MC-B

Sumida America Components Inc.In Stock: 726CDRH74NP-121MC-B Datasheet

SimilarRFQ

SRR7045-121M

Bourns Inc.In Stock: 1651SRR7045-121M Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CDR74NP-121MC is determined by the following criteria:

Primary Matching Criteria:

• Inductance value: 120 µH (fixed requirement)
• Inductance tolerance: Must accommodate ±20% or tighter specification
• Shielding: Shielded configuration required
• Mounting type: Surface mount only
• RoHS compliance: ROHS3 Compliant

Secondary Compatibility Criteria:

• Current rating: Substitute must equal or exceed 470 mA
• DC resistance: Lower or equal to 620 mOhm preferred; higher values acceptable if circuit design permits
• Physical dimensions: Nonstandard package; dimensional compatibility with PCB layout required
• Moisture sensitivity: MSL 1 acceptable

Identified Substitutes:

1. CDRH74NP-121MC-B (Sumida America Components Inc.) — Active product with enhanced current rating (520 mA) and improved thermal characteristics
2. SRR7045-121M (Bourns Inc.) — Active product with superior current rating (900 mA) and lower DC resistance (420 mOhm)

Parameter Comparison

Engineering Selection Recommendations

CDRH74NP-121MC-B Selection Criteria:

The CDRH74NP-121MC-B is an active product from the same manufacturer (Sumida America Components Inc.) with direct lineage to the obsolete CDR74NP-121MC. This substitute provides a 10.6% increase in current rating (520 mA vs. 470 mA) while maintaining the 120 µH inductance specification. The DC resistance increases marginally to 660 mOhm (6.5% higher), which remains within acceptable tolerance for most applications. Physical dimensions are comparable (7.30 x 7.30 mm vs. 7.70 x 7.10 mm), with reduced height (4.50 mm vs. 4.85 mm). Operating temperature range is specified at -40°C to 100°C. This part is available in Tape & Reel packaging and maintains ROHS3 compliance and MSL 1 rating.

SRR7045-121M Selection Criteria:

The SRR7045-121M is an active product from Bourns Inc. offering superior electrical performance with a 91.5% increase in current rating (900 mA vs. 470 mA) and a 32.3% reduction in DC resistance (420 mOhm vs. 620 mOhm). The inductor features a drum core, wirewound construction with documented saturation current of 550 mA. Physical dimensions are slightly smaller (7.00 x 7.00 mm vs. 7.70 x 7.10 mm) with comparable height (4.80 mm vs. 4.85 mm). Operating temperature range extends to -40°C to 125°C. This part is available in Tape & Reel packaging and maintains ROHS3 compliance and MSL 1 rating. The lower DC resistance and higher current rating make this substitute suitable for applications requiring enhanced thermal performance and current headroom.

Compliance and Certification:

Both substitute parts maintain ROHS3 compliance, EAR99 ECCN classification, and MSL 1 moisture sensitivity rating, ensuring compatibility with existing supply chain and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can CDRH74NP-121MC-B directly replace CDR74NP-121MC in all applications?

A: The CDRH74NP-121MC-B maintains the same 120 µH inductance and shielded surface mount configuration. The 10.6% increase in current rating and 6.5% increase in DC resistance are within typical design margins. Physical dimensions differ slightly (7.30 x 7.30 mm vs. 7.70 x 7.10 mm); PCB layout compatibility must be verified. The part is active and available in production quantities.

Q: What are the advantages of SRR7045-121M over CDRH74NP-121MC-B?

A: The SRR7045-121M provides significantly higher current rating (900 mA vs. 520 mA) and lower DC resistance (420 mOhm vs. 660 mOhm), resulting in reduced power dissipation and improved thermal performance. Operating temperature range extends to 125°C. These characteristics make it suitable for high-current or thermally constrained applications. Physical dimensions are slightly smaller.

Q: Are there dimensional compatibility concerns when substituting these parts?

A: All three parts use nonstandard packages with comparable footprints. CDR74NP-121MC measures 7.70 x 7.10 mm; CDRH74NP-121MC-B measures 7.30 x 7.30 mm; SRR7045-121M measures 7.00 x 7.00 mm. Height differences are minimal (4.85 mm, 4.50 mm, and 4.80 mm respectively). PCB layout verification is required to confirm pad spacing and clearance compatibility.

Q: Do all substitute parts maintain RoHS and moisture sensitivity compliance?

A: Yes. Both CDRH74NP-121MC-B and SRR7045-121M are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original CDR74NP-121MC specification.

Q: What is the inductance tolerance specification for substitute parts?

A: CDRH74NP-121MC-B and SRR7045-121M both specify ±20% inductance tolerance, compared to -15%, +20% for the original CDR74NP-121MC. This tighter symmetrical tolerance is acceptable for most applications.

Q: Which substitute is recommended for new designs?

A: Selection depends on application requirements. For direct replacement with minimal design changes, CDRH74NP-121MC-B is recommended due to manufacturer continuity and comparable electrical characteristics. For applications requiring enhanced current capacity and lower losses, SRR7045-121M is recommended. Both parts are active products with established supply availability.