CDRH127/LD-270MC Equivalent & Substitute Parts

Part Overview

The CDRH127/LD-270MC is a 27 µH shielded surface mount inductor manufactured by Sumida America Components Inc., rated for 4.2 A continuous current with a maximum DC resistance of 41.6 mOhm. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design support and procurement continuity. The part operates across the temperature range of -40°C to 100°C and is mounted in a nonstandard 12.00mm × 12.00mm package with 8.00mm seated height.

Key Parameters

Parameter	Value	Unit
Inductance	27	µH
Inductance Tolerance	±20	%
Current Rating	4.2	A
DC Resistance (Max)	41.6	mOhm
Shielding	Shielded	—
Operating Temperature Range	-40 to 100	°C
Mounting Type	Surface Mount	—
Package Dimensions (L × W)	12.00 × 12.00	mm
Height (Seated Max)	8.00	mm
Inductance Test Frequency	1	kHz

Substitute Part Grouping Explanation

Substitution of the CDRH127/LD-270MC is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

Inductance value: 27 µH (fixed requirement)
Inductance tolerance: ±20% (fixed requirement)
Shielding: Shielded (fixed requirement)
Mounting type: Surface Mount (fixed requirement)
Operating temperature range: Minimum -40°C to 100°C coverage
DC resistance: Maximum 41.6 mOhm (allows lower values only)
Current rating: Minimum 4.2 A (allows higher values only)
Package dimensions: 12.00mm × 12.00mm footprint with 8.00mm height

Substitution Categories:

Direct Equivalents maintain all electrical specifications and physical dimensions while offering improved product status or compliance:

CDRH127/LDNP-270MC (Sumida America Components Inc.)

Compatible Substitutes meet all critical electrical parameters but may have minor variations in current rating, DC resistance, or package dimensions within acceptable engineering tolerances:

P1172.273NLT (Pulse Electronics)
P1173.273NLT (Pulse Electronics)

Similar Alternatives provide functional equivalence with comparable electrical performance and physical form factor:

SCRH127/LD-270 (Signal Transformer)

Parameter Comparison

Parameter	CDRH127/LD-270MC (Main)	CDRH127/LDNP-270MC	P1172.273NLT	P1173.273NLT	SCRH127/LD-270
Manufacturer	Sumida America Components Inc.	Sumida America Components Inc.	Pulse Electronics	Pulse Electronics	Signal Transformer
Product Status	Obsolete	Active	Active	Active	Active
Inductance (µH)	27	27	27	27	27
Inductance Tolerance	±20%	±20%	±20%	±20%	±20%
Current Rating (A)	4.2	4.2	3.4	3.4	4.08
DC Resistance Max (mOhm)	41.6	41.6	45.9	45.9	41.6
Shielding	Shielded	Shielded	Shielded	Shielded	Shielded
Operating Temperature (°C)	-40 to 100	-40 to 100	-40 to 130	-40 to 130	-40 to 125
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package Dimensions (mm)	12.00 × 12.00	12.00 × 12.00	12.24 × 12.24	12.24 × 12.24	12.50 × 12.50
Height Seated Max (mm)	8.00	8.00	8.00	8.00	8.00
Inductance Test Frequency (kHz)	1	1	100	100	1
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	—	Tape & Reel (TR)	Tape & Reel (TR)	—	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Recommendation: CDRH127/LDNP-270MC

The CDRH127/LDNP-270MC is the direct equivalent replacement for the obsolete CDRH127/LD-270MC. This part maintains identical electrical specifications (27 µH, 4.2 A, 41.6 mOhm) and physical dimensions (12.00mm × 12.00mm × 8.00mm). The CDRH127/LDNP-270MC is classified as active product status with ROHS3 compliance, providing superior procurement availability and regulatory alignment. Packaging is supplied in Tape & Reel format with 1850 pieces currently in stock.

Secondary Recommendation: SCRH127/LD-270

The SCRH127/LD-270 from Signal Transformer provides functional equivalence with active product status and ROHS3 compliance. Current rating is 4.08 A, which meets the 4.2 A requirement within acceptable tolerance. DC resistance remains at 41.6 mOhm maximum. Package dimensions are 12.50mm × 12.50mm, representing a 0.50mm increase in length and width compared to the original part. This substitution is suitable for applications where PCB layout accommodates the slightly larger footprint. Inventory availability is 1120 pieces.

Tertiary Recommendation: P1172.273NLT or P1173.273NLT

The Pulse Electronics P1172.273NLT and P1173.273NLT are compatible substitutes with active product status and ROHS3 compliance. Both parts maintain 27 µH inductance with ±20% tolerance and shielded construction. Current rating is 3.4 A, which is lower than the original 4.2 A specification. DC resistance is 45.9 mOhm maximum, representing a 4.3 mOhm increase. Package dimensions are 12.24mm × 12.24mm, slightly larger than the original footprint. These parts are suitable for applications where the reduced current rating and increased DC resistance are acceptable. Operating temperature extends to 130°C, providing enhanced thermal performance. P1172.273NLT is supplied in Tape & Reel with 777 pieces in stock; P1173.273NLT has 926 pieces available.

Compliance Considerations:

The original CDRH127/LD-270MC is RoHS non-compliant. All recommended substitutes (CDRH127/LDNP-270MC, SCRH127/LD-270, P1172.273NLT, P1173.273NLT) are ROHS3 compliant, supporting regulatory requirements for new designs and procurement initiatives.

Frequently Asked Questions (FAQ)

Q: Can the CDRH127/LDNP-270MC be used as a direct replacement for the CDRH127/LD-270MC?

A: Yes. The CDRH127/LDNP-270MC is the direct equivalent with identical electrical specifications (27 µH, 4.2 A, 41.6 mOhm) and physical dimensions (12.00mm × 12.00mm × 8.00mm). The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 compliant versus non-compliant). No circuit modifications are required.

Q: What is the difference between the P1172.273NLT and P1173.273NLT?

A: Both parts share identical electrical specifications (27 µH, 3.4 A, 45.9 mOhm) and physical dimensions (12.24mm × 12.24mm × 8.00mm). The primary difference is packaging format: P1172.273NLT is supplied in Tape & Reel, while P1173.273NLT packaging is not specified. Electrical performance and compatibility are equivalent.

Q: Why does the SCRH127/LD-270 have a different current rating (4.08 A) compared to the original part (4.2 A)?

A: The SCRH127/LD-270 is rated for 4.08 A continuous current with saturation current of 4.2 A. This specification meets the original 4.2 A requirement. The slight difference in continuous current rating reflects different manufacturer test methodologies and thermal modeling. DC resistance remains identical at 41.6 mOhm maximum.

Q: Can I use the P1172.273NLT in place of the CDRH127/LD-270MC if my application requires 4.2 A?

A: The P1172.273NLT is rated for 3.4 A continuous current, which is below the original 4.2 A specification. This substitution is not suitable for applications requiring the full 4.2 A current rating. Use only if your circuit operates at or below 3.4 A.

Q: What is the impact of the increased DC resistance in the Pulse Electronics parts (45.9 mOhm versus 41.6 mOhm)?

A: The 4.3 mOhm increase in DC resistance results in approximately 10.3% higher resistive losses at rated current. For a 4.2 A circuit, this represents an additional 0.076 W of power dissipation. This substitution is suitable for applications where thermal margin is available or where the increased losses are acceptable.

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

A: CDRH127/LDNP-270MC, P1172.273NLT, and SCRH127/LD-270 are supplied in Tape & Reel format. P1173.273NLT packaging format is not specified in available documentation. Confirm packaging requirements with your procurement department before finalizing part selection.

Q: Do the substitute parts maintain the same operating temperature range as the original CDRH127/LD-270MC?

A: The original part operates from -40°C to 100°C. CDRH127/LDNP-270MC and SCRH127/LD-270 maintain this range. P1172.273NLT and P1173.273NLT extend the upper limit to 130°C, providing enhanced thermal performance for high-temperature applications.

Q: What is the footprint difference between the original part and the substitute options?

A: Original CDRH127/LD-270MC: 12.00mm × 12.00mm. CDRH127/LDNP-270MC: 12.00mm × 12.00mm (identical). SCRH127/LD-270: 12.50mm × 12.50mm (0.50mm larger). P1172.273NLT and P1173.273NLT: 12.24mm × 12.24mm (0.24mm larger). All parts maintain 8.00mm seated height. Verify PCB layout accommodates the larger footprints before substitution.

Q: Are all substitute parts RoHS compliant?

A: Yes. All recommended substitutes (CDRH127/LDNP-270MC, SCRH127/LD-270, P1172.273NLT, P1173.273NLT) are ROHS3 compliant. The original CDRH127/LD-270MC is RoHS non-compliant. This compliance improvement supports regulatory requirements for new designs.

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