SCRH127/LD-7R4 Equivalent & Substitute Parts

Part Overview

The SCRH127/LD-7R4 is a 7.4 µH shielded surface mount inductor manufactured by Signal Transformer, rated for 6.9 A continuous current with a maximum DC resistance of 17.7 mOhm. This component is designed for applications requiring compact, shielded inductance in nonstandard packaging. The part is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical and mechanical parameters are maintained within the specified tolerances, ensuring functional interchangeability in the target application circuit.

Substiute Parts

SCRH127/LD-7R4

Signal TransformerIn Stock: 971SCRH127/LD-7R4 Datasheet

Current PartRFQ

CDRH127/LDNP-7R4NC

Sumida America Components Inc.In Stock: 2237CDRH127/LDNP-7R4NC Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SCRH127/LD-7R4 is determined by the following critical parameters:

• Inductance Value: Must be 7.4 µH with ±30% tolerance
• DC Resistance: Must not exceed 17.7 mOhm maximum
• Current Rating: Must meet or exceed 6.9 A continuous rating
• Shielding: Must be shielded construction
• Mounting Type: Must be surface mount
• Package Configuration: Must accommodate nonstandard form factor
• Inductance Test Frequency: Must be measured at 100 kHz
• Compliance: Must maintain RoHS3 compliance and MSL 1 rating

The CDRH127/LDNP-7R4NC from Sumida America Components Inc. meets all substitution criteria and is classified as a manufacturer-recommended equivalent.

Parameter Comparison

Engineering Selection Recommendations

The CDRH127/LDNP-7R4NC is qualified as a direct substitute based on electrical parameter equivalence and compliance certification alignment. Both parts maintain ROHS3 compliance and MSL 1 ratings, ensuring regulatory and environmental compatibility.

The substitute part provides a higher current saturation rating (7.4 A versus 6.9 A), which offers improved thermal margin in applications operating near maximum current specifications. The ferrite core material specification in the substitute part provides documented core composition, whereas the original part does not specify core material.

The operating temperature range of the substitute part extends to 100°C maximum, compared to 125°C for the original part. Applications requiring operation above 100°C must retain the original SCRH127/LD-7R4 specification.

Physical dimensions of the substitute part are slightly reduced (12.00 x 12.00 mm versus 12.50 x 12.50 mm), with identical seated height. PCB layout verification is required to confirm footprint compatibility in existing designs.

Frequently Asked Questions (FAQ)

Q: Can the CDRH127/LDNP-7R4NC be used as a direct replacement for the SCRH127/LD-7R4?

A: Yes, provided the application operating temperature does not exceed 100°C. The substitute part meets all electrical specifications and maintains equivalent compliance certifications. PCB footprint verification is required due to minor dimensional differences.

Q: What is the primary difference between these two parts?

A: The maximum operating temperature differs: the original part is rated to 125°C, while the substitute is rated to 100°C. The substitute part also specifies ferrite core material and has slightly smaller planar dimensions (12.00 x 12.00 mm versus 12.50 x 12.50 mm).

Q: Are both parts RoHS3 compliant?

A: Yes, both the SCRH127/LD-7R4 and CDRH127/LDNP-7R4NC are ROHS3 compliant with MSL 1 (unlimited) moisture sensitivity ratings.

Q: Does the higher current rating of the substitute part affect circuit performance?

A: No. The higher current saturation rating (7.4 A versus 6.9 A) of the substitute part provides additional thermal margin without altering inductance or DC resistance characteristics. Both parts maintain identical inductance values and maximum DC resistance specifications.

Q: What should be verified before implementing the substitute part?

A: Confirm that the application operating temperature range does not exceed 100°C. Verify PCB footprint compatibility given the reduced planar dimensions of the substitute part (12.00 x 12.00 mm). Electrical circuit performance remains equivalent when these conditions are met.