CDRH74NP-121MC-B Equivalent & Substitute Parts

Part Overview

The CDRH74NP-121MC-B is a 120 µH shielded surface mount inductor manufactured by Sumida America Components Inc. This fixed inductor is designed for applications requiring moderate current handling at 520 mA with a maximum DC resistance of 660 mOhm. The component features ferrite core construction with shielding to minimize electromagnetic interference. The part is Active in product status and maintains full RoHS3 compliance. Substitute parts are identified when equivalent electrical and mechanical specifications are required due to inventory constraints, supply chain considerations, or design flexibility within the allowed parameter ranges.

Substiute Parts

CDRH74NP-121MC-B

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

Current PartRFQ

SRR0745A-121M

Bourns Inc.In Stock: 3971SRR0745A-121M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CDRH74NP-121MC-B is determined by strict alignment of the following critical parameters:

Inductance Value: Must be 120 µH with ±20% tolerance to maintain circuit performance.

Current Rating: Substitute parts must support a minimum of 520 mA. Parts with higher current ratings (600 mA or greater) are acceptable as they provide additional design margin without compromising circuit function.

DC Resistance: Substitute parts must not exceed 660 mOhm maximum. Lower DC resistance values are acceptable as they reduce power dissipation.

Core Material & Shielding: Both the main part and substitutes must use ferrite core construction with shielding to maintain electromagnetic compatibility and performance characteristics.

Mounting Type & Package Footprint: Surface mount configuration with 7.30 x 7.30 mm footprint is required for PCB compatibility.

Environmental Compliance: All substitute parts must maintain RoHS3 compliance and MSL Level 1 rating.

The SRR0745A-121M from Bourns Inc. meets all substitution criteria and is classified as an equivalent substitute part.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection: The CDRH74NP-121MC-B remains the preferred choice when available. This part is Active in product status with 636 units in stock, ensuring supply continuity for current production requirements.

Substitute Part Selection: The SRR0745A-121M from Bourns Inc. is qualified as a direct equivalent substitute. This part is also Active in product status with 3884 units available in inventory. The substitute provides the following advantages within the allowed parameter framework:

• Current rating of 600 mA exceeds the 520 mA requirement, providing additional design margin
• DC resistance of 550 mOhm is lower than the 660 mOhm maximum, reducing power dissipation
• Operating temperature range extends to 125°C compared to 100°C, supporting broader thermal applications
• Height of 4.70 mm is within acceptable PCB assembly tolerances relative to the 4.50 mm specification

Both parts maintain identical inductance values, tolerance specifications, core materials, shielding characteristics, and RoHS3 compliance. The SRR0745A-121M carries AEC-Q200 automotive qualification, which may be relevant for specific application requirements.

Frequently Asked Questions (FAQ)

Q: Can the SRR0745A-121M be used as a direct replacement for the CDRH74NP-121MC-B?

A: Yes. The SRR0745A-121M meets all critical electrical and mechanical parameters required for substitution. Both parts share identical inductance values (120 µH), tolerance (±20%), core material (ferrite), shielding, mounting type (surface mount), and package footprint (7.30 x 7.30 mm). The substitute part provides equal or improved performance across all measured parameters.

Q: What are the differences in current handling between these two parts?

A: The CDRH74NP-121MC-B is rated for 520 mA continuous current. The SRR0745A-121M is rated for 600 mA continuous current with a saturation current of 700 mA. The higher current rating of the substitute part provides additional design margin and is fully compatible with circuits designed for the original part.

Q: How do the DC resistance values compare?

A: The CDRH74NP-121MC-B has a maximum DC resistance of 660 mOhm. The SRR0745A-121M has a maximum DC resistance of 550 mOhm. The lower resistance of the substitute part results in reduced power dissipation and improved efficiency in the circuit.

Q: Are there any height or footprint differences that affect PCB assembly?

A: Both parts use identical 7.30 x 7.30 mm footprints for PCB compatibility. The seated height differs slightly: CDRH74NP-121MC-B is 4.50 mm maximum, while SRR0745A-121M is 4.70 mm maximum. This 0.20 mm difference is within standard PCB assembly tolerances and does not affect component placement or clearance.

Q: Do both parts meet the same environmental and compliance standards?

A: Yes. Both the CDRH74NP-121MC-B and SRR0745A-121M are RoHS3 compliant, carry MSL Level 1 (Unlimited) moisture sensitivity ratings, and are classified under ECCN EAR99 with HTSUS code 8504.50.4000. The SRR0745A-121M additionally carries AEC-Q200 automotive qualification.

Q: What is the operating temperature range for each part?

A: The CDRH74NP-121MC-B operates from -40°C to 100°C. The SRR0745A-121M operates from -40°C to 125°C. The substitute part supports a wider temperature range, making it suitable for applications requiring extended thermal performance.

Q: Are both parts tested at the same inductance frequency?

A: Yes. Both parts have inductance values tested and specified at 1 kHz, ensuring consistent measurement methodology and comparable performance data.