SCRH127/LD-270 Equivalent & Substitute Parts

Part Overview

The SCRH127/LD-270 is a 27 µH shielded surface mount inductor manufactured by Signal Transformer, designed for applications requiring fixed inductance with moderate current handling capability. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when original stock becomes unavailable, when supply chain constraints occur, or when design flexibility permits component interchange within specified electrical and mechanical tolerances.

Substiute Parts

SCRH127/LD-270

Signal TransformerIn Stock: 1198SCRH127/LD-270 Datasheet

Current PartRFQ

CDRH127NP-270MC

Sumida America Components Inc.In Stock: 2335CDRH127NP-270MC Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SCRH127/LD-270 is permissible when the following core electrical parameters are maintained within acceptable design margins:

Inductance value must remain 27 µH with ±20% tolerance to ensure circuit performance specifications are met. Shielding type must be Shielded to maintain electromagnetic compatibility and prevent interference in sensitive applications. Mounting type must be Surface Mount to ensure PCB assembly compatibility. Operating temperature range must encompass the application's required operating conditions; the substitute part's range may be narrower but must not fall below the minimum required temperature.

Current rating and DC resistance are critical for thermal management and power dissipation calculations. Substitute parts with lower current ratings or higher DC resistance values introduce design constraints and must be evaluated against circuit requirements. Physical dimensions (length, width, and height) must be compatible with PCB layout and component placement constraints.

Parameter Comparison

Engineering Selection Recommendations

Both the SCRH127/LD-270 and CDRH127NP-270MC maintain identical inductance values and tolerance specifications, ensuring equivalent circuit performance in inductance-dependent functions. Both components are RoHS3 compliant with MSL Level 1 rating, meeting environmental and reliability standards for industrial and commercial applications.

The SCRH127/LD-270 provides a higher current rating of 4.08 A compared to the CDRH127NP-270MC at 3.4 A, representing a 20% reduction in current capacity for the substitute part. The SCRH127/LD-270 also features lower DC resistance at 41.6 mOhm Max versus 45.9 mOhm Max, resulting in reduced power dissipation and improved thermal performance.

The SCRH127/LD-270 supports an operating temperature range of -40°C to 125°C, while the CDRH127NP-270MC is rated to -40°C to 100°C. Applications requiring operation above 100°C must use the original SCRH127/LD-270 component.

Physical dimensions differ slightly: the SCRH127/LD-270 measures 12.50mm x 12.50mm while the CDRH127NP-270MC measures 12.00mm x 12.00mm. Both maintain identical maximum seated height of 8.00mm, ensuring compatibility with standard PCB assembly processes.

Frequently Asked Questions (FAQ)

Q: Can CDRH127NP-270MC be used as a direct replacement for SCRH127/LD-270 in all applications?

A: The CDRH127NP-270MC is electrically equivalent for inductance value and tolerance. However, the reduced current rating (3.4 A vs. 4.08 A) and higher DC resistance (45.9 mOhm vs. 41.6 mOhm) must be evaluated against circuit current requirements and thermal constraints. The narrower operating temperature range (-40°C to 100°C vs. -40°C to 125°C) restricts use in high-temperature applications.

Q: What are the critical parameters for substitution between these inductors?

A: Inductance value (27 µH), inductance tolerance (±20%), shielding type (Shielded), and mounting type (Surface Mount) are the primary substitution criteria. Current rating, DC resistance, and operating temperature range must be verified against specific circuit requirements before substitution.

Q: Are there physical compatibility concerns when substituting CDRH127NP-270MC for SCRH127/LD-270?

A: The CDRH127NP-270MC is slightly smaller in footprint (12.00mm x 12.00mm vs. 12.50mm x 12.50mm) but maintains the same maximum height (8.00mm). PCB layout must accommodate the smaller footprint; existing pad patterns designed for the larger SCRH127/LD-270 may require adjustment.

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

A: Both components are RoHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity rating. Both are classified as Active product status. REACH status differs: SCRH127/LD-270 is REACH Unaffected while CDRH127NP-270MC is Vendor Undefined.

Q: What is the impact of higher DC resistance in the substitute part?

A: The CDRH127NP-270MC exhibits 4.3 mOhm higher DC resistance (45.9 mOhm vs. 41.6 mOhm). This results in increased power dissipation (I²R losses) and higher operating temperature under load. For applications with sustained high current operation, thermal analysis is required to ensure the substitute part remains within acceptable temperature limits.