CDRH127/LD-271MC Equivalent & Substitute Parts

Part Overview

The CDRH127/LD-271MC is a 270 µH shielded surface mount inductor manufactured by Sumida America Components Inc., rated for 1.3 A continuous current with a maximum DC resistance of 419mOhm. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The part operates across the temperature range of -40°C to 100°C and is mounted on nonstandard package dimensions of 12.00mm × 12.00mm × 8.00mm (seated height).

Due to its obsolete status, direct replacements from active product lines are required for procurement continuity. Substitute parts must maintain electrical equivalence in inductance value, current rating, and DC resistance characteristics while meeting modern compliance standards.

Key Parameters

Parameter	Value	Unit	Criticality for Substitution
Inductance	270	µH	Critical
Inductance Tolerance	±20%	%	Critical
Current Rating	1.3	A	Critical
DC Resistance (DCR)	419	mOhm Max	Critical
Shielding	Shielded	—	Critical
Mounting Type	Surface Mount	—	Critical
Operating Temperature Range	-40°C to 100°C	°C	Important
Inductance Test Frequency	1	kHz	Important
Moisture Sensitivity Level	1 (Unlimited)	—	Important

Substitute Part Grouping Explanation

Substitute parts for the CDRH127/LD-271MC are classified into two categories based on electrical and mechanical parameter alignment:

Direct Equivalent (Highest Compatibility): The CDRH127/LDNP-271MC from Sumida America Components Inc. maintains identical electrical specifications: 270 µH inductance at ±20% tolerance, 1.3 A current rating, and 419mOhm maximum DC resistance. Physical dimensions and mounting characteristics are identical. The primary distinction is product status (active versus obsolete) and packaging format (Tape & Reel versus bulk). This part is ROHS3 compliant and represents the primary replacement path.

Similar Equivalents (Parameter Variance Acceptable): The SCRH127/LD-271 (Signal Transformer) and SPD127R-274M (API Delevan Inc.) provide functional equivalence with specified parameter tolerances:

SCRH127/LD-271: Maintains 270 µH inductance and 419mOhm DCR. Current rating is 1.28 A (0.02 A below primary specification). Operating temperature extends to 125°C. Physical dimensions vary slightly (12.50mm × 12.50mm versus 12.00mm × 12.00mm). Acceptable for applications where the 1.28 A rating meets circuit requirements.
SPD127R-274M: Maintains 270 µH inductance with ±20% tolerance. Current rating is 1.1 A (0.2 A below primary specification) with maximum DCR of 520mOhm (101mOhm above primary specification). Operating temperature range extends to -55°C to 125°C. Physical dimensions match primary part (12.00mm × 12.00mm). Acceptable for applications with lower current demands or where extended temperature range is required.

All substitute parts are shielded, surface mount components with MSL rating of 1 (Unlimited) and ROHS3 compliance.

Parameter Comparison

Parameter	CDRH127/LD-271MC (Main)	CDRH127/LDNP-271MC (Direct)	SCRH127/LD-271 (Similar)	SPD127R-274M (Similar)
Manufacturer	Sumida America Components Inc.	Sumida America Components Inc.	Signal Transformer	API Delevan Inc.
Inductance	270 µH	270 µH	270 µH	270 µH
Inductance Tolerance	±20%	±20%	±20%	±20%
Current Rating	1.3 A	1.3 A	1.28 A	1.1 A
DC Resistance (Max)	419 mOhm	419 mOhm	419 mOhm	520 mOhm
Shielding	Shielded	Shielded	Shielded	Shielded
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Size (L × W)	12.00 × 12.00 mm	12.00 × 12.00 mm	12.50 × 12.50 mm	12.00 × 12.00 mm
Height (Seated Max)	8.00 mm	8.00 mm	8.00 mm	8.00 mm
Operating Temperature	-40°C to 100°C	-40°C to 100°C	-40°C to 125°C	-55°C to 125°C
Product Status	Obsolete	Active	Active	Active
RoHS Compliance	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Packaging	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Selection: CDRH127/LDNP-271MC

The CDRH127/LDNP-271MC is the recommended direct replacement for the obsolete CDRH127/LD-271MC. This part maintains complete electrical and mechanical equivalence with identical inductance, current rating, and DC resistance specifications. The part is active in production, available in standard Tape & Reel packaging for automated assembly, and carries ROHS3 compliance certification. The ferrite core material is explicitly specified, providing consistency with the original design intent. Current inventory of 752 pieces supports production requirements.

Secondary Selection: SCRH127/LD-271

The SCRH127/LD-271 from Signal Transformer is suitable for applications where the 1.28 A current rating satisfies circuit requirements. This part maintains identical inductance and DC resistance values. The extended operating temperature range to 125°C provides additional thermal margin. Physical dimensions increase by 0.50mm in length and width (12.50mm versus 12.00mm), requiring PCB layout verification. ROHS3 compliance and active product status support long-term availability. Inventory of 978 pieces is available.

Tertiary Selection: SPD127R-274M

The SPD127R-274M from API Delevan Inc. is applicable for circuits with maximum current requirements of 1.1 A. The increased DC resistance of 520mOhm (101mOhm above specification) results in higher power dissipation and must be evaluated against thermal design constraints. The extended operating temperature range (-55°C to 125°C) and drum core wirewound construction provide design flexibility for extreme environment applications. Physical dimensions match the primary part. ROHS3 compliance and active status ensure procurement continuity. Inventory of 1004 pieces is available.

All substitute parts carry ECCN classification EAR99 and REACH Unaffected status, maintaining regulatory alignment with the original component.

Frequently Asked Questions (FAQ)

Q: Can CDRH127/LDNP-271MC be used as a direct drop-in replacement for CDRH127/LD-271MC?

A: Yes. The CDRH127/LDNP-271MC provides complete electrical and mechanical equivalence. Inductance, current rating, DC resistance, shielding, and physical dimensions are identical. The primary difference is packaging format (Tape & Reel versus bulk) and product status (active versus obsolete). PCB layout and assembly processes require no modification.

Q: What are the current rating implications when substituting with SCRH127/LD-271?

A: The SCRH127/LD-271 has a rated current of 1.28 A compared to the primary specification of 1.3 A. This 0.02 A reduction is acceptable for applications where circuit current demand does not exceed 1.28 A. For circuits requiring the full 1.3 A rating, this part is not suitable. Saturation current is specified at 1.3 A, providing margin at the rated current level.

Q: How does the increased DC resistance of SPD127R-274M affect circuit performance?

A: The SPD127R-274M has a maximum DC resistance of 520mOhm compared to 419mOhm for the primary part. This 101mOhm increase results in higher resistive losses and power dissipation. For a 1.1 A current, the additional power loss is approximately 0.126 watts. Thermal design and circuit efficiency calculations must account for this increase. This part is suitable only for applications where current demand does not exceed 1.1 A.

Q: Are all substitute parts RoHS compliant?

A: The CDRH127/LD-271MC (original) is RoHS non-compliant. All substitute parts—CDRH127/LDNP-271MC, SCRH127/LD-271, and SPD127R-274M—are ROHS3 compliant. This compliance upgrade is mandatory for new designs and many production environments.

Q: What is the impact of the SCRH127/LD-271 dimension increase from 12.00mm to 12.50mm?

A: The SCRH127/LD-271 increases in length and width by 0.50mm each (12.00mm × 12.00mm to 12.50mm × 12.50mm). Seated height remains 8.00mm. PCB footprint and component placement must be verified to ensure clearance with adjacent components and routing constraints. This dimensional change may require PCB layout modification.

Q: Can substitute parts be mixed within a single production batch?

A: Mixing substitute parts within a single batch is not recommended. Each substitute part has distinct electrical characteristics (current rating, DC resistance) and physical dimensions. Batch consistency requires selection of a single substitute part per production run. Different substitute parts should be used only in separate production batches with documented design verification.

Q: What is the significance of the ferrite core material specification in CDRH127/LDNP-271MC?

A: The ferrite core material is explicitly specified for CDRH127/LDNP-271MC, providing consistency with the original design. The SCRH127/LD-271 does not specify core material in the provided data. The SPD127R-274M specifies ferrite core with drum core wirewound construction. Core material affects frequency response, temperature stability, and saturation characteristics. The ferrite specification in CDRH127/LDNP-271MC ensures electromagnetic performance alignment with the original design.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Yes. CDRH127/LDNP-271MC, SCRH127/LD-271, and SPD127R-274M are all available in Tape & Reel (TR) packaging, suitable for automated assembly processes. The original CDRH127/LD-271MC is available only in bulk packaging. Tape & Reel format is standard for modern production environments.

Q: What inventory levels support production continuity?

A: Current inventory levels are: CDRH127/LDNP-271MC (752 pieces), SCRH127/LD-271 (978 pieces), and SPD127R-274M (1004 pieces). These quantities support medium-volume production runs. For high-volume requirements, supplier lead times and production schedules must be confirmed with manufacturers.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message