CDRH125-271MC Equivalent & Substitute Parts

Part Overview

The CDRH125-271MC is a 270 µH shielded surface mount inductor manufactured by Sumida America Components Inc., rated for 750 mA continuous current with a maximum DC resistance of 460 mOhm. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and procurement continuity. The part operates across a temperature range of -25°C to 80°C and is mounted on nonstandard package dimensions of 12.00mm × 12.00mm × 6.00mm (seated height).

Due to its obsolete status, active equivalent parts from Sumida and alternative manufacturers provide functional replacements while offering improved product lifecycle support and compliance certifications.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Inductance	270	µH	Critical - must match exactly
Current Rating	750	mA	Critical - minimum acceptable rating
DC Resistance (DCR)	460	mOhm Max	Critical - power loss and thermal performance
Shielding	Shielded	—	Critical - EMI containment
Mounting Type	Surface Mount	—	Critical - assembly compatibility
Package Dimensions	12.00mm × 12.00mm × 6.00mm	L × W × H	Important - PCB layout fit
Tolerance	±20%	—	Important - circuit performance margin
Operating Temperature	-25°C to 80°C	—	Important - thermal operating envelope
Inductance Test Frequency	1	kHz	Reference - measurement standard

Substitute Part Grouping Explanation

Substitute parts are classified into two categories based on electrical and mechanical compatibility with the CDRH125-271MC:

Direct Substitutes maintain identical or superior electrical specifications within the allowed parameter tolerances:

Inductance: 270 µH (±20% tolerance)
Current Rating: 750 mA minimum
DC Resistance: 460 mOhm maximum
Shielding: Shielded configuration
Mounting: Surface mount, nonstandard package
Operating Temperature: Must encompass or exceed -25°C to 80°C range

Similar Substitutes provide functional equivalence with minor parameter variations that remain within acceptable engineering margins:

Current Rating: May exceed 750 mA (higher current capacity acceptable)
DC Resistance: May exceed 460 mOhm within specified limits
Package Dimensions: Minor dimensional variations (±0.5mm) acceptable if PCB layout permits
Operating Temperature: Extended ranges acceptable if minimum -25°C and maximum 80°C are met

All substitute parts maintain shielded construction, surface mount configuration, 270 µH inductance, and ±20% tolerance as mandatory requirements.

Parameter Comparison

Part Number	Manufacturer	Inductance (µH)	Current Rating (mA)	DCR Max (mOhm)	Shielding	Package L×W (mm)	Height Max (mm)	Temp Range (°C)	Product Status	RoHS Compliance
CDRH125-271MC	Sumida	270	750	460	Shielded	12.00 × 12.00	6.00	-25 to 80	Obsolete	Non-compliant
CDRH125NP-271MC	Sumida	270	750	460	Shielded	12.00 × 12.00	6.00	-40 to 100	Active	RoHS3 Compliant
PA4304.274NLT	Pulse Electronics	270	750	460	Shielded	12.50 × 12.50	6.00	-40 to 125	Active	RoHS3 Compliant
SPD125R-274M	API Delevan	270	750	510	Shielded	12.00 × 12.00	6.00	-55 to 125	Active	RoHS3 Compliant
P1171.274NLT	Pulse Electronics	270	910	460	Shielded	12.24 × 12.24	6.00	-40 to 130	Active	RoHS3 Compliant
P1170.274NLT	Pulse Electronics	270	910	460	Shielded	12.24 × 12.24	6.00	-40 to 130	Active	RoHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: CDRH125NP-271MC

The CDRH125NP-271MC from Sumida America Components Inc. is the direct equivalent replacement for the obsolete CDRH125-271MC. This part maintains identical electrical specifications (270 µH, 750 mA, 460 mOhm DCR) and physical dimensions (12.00mm × 12.00mm × 6.00mm). The primary advantages are identical package geometry ensuring direct PCB compatibility and active product status with RoHS3 compliance. The extended operating temperature range (-40°C to 100°C) provides improved thermal margin compared to the original part.

Secondary Recommendation: PA4304.274NLT

The PA4304.274NLT from Pulse Electronics provides equivalent electrical performance with identical current rating and DCR specifications. This part features a ferrite drum core construction and is actively manufactured with RoHS3 compliance. The package dimensions are marginally larger (12.50mm × 12.50mm) but maintain the same 6.00mm seated height. This option is suitable when PCB layout permits the minor dimensional increase and when extended temperature operation (-40°C to 125°C) is beneficial.

Alternative Consideration: SPD125R-274M

The SPD125R-274M from API Delevan Inc. maintains identical package dimensions and current rating but specifies a maximum DCR of 510 mOhm, representing a 50 mOhm increase over the original specification. This part is acceptable only when circuit design tolerates the additional 10.9% resistance increase and associated power dissipation. The extended temperature range (-55°C to 125°C) and RoHS3 compliance are advantages for demanding applications.

Not Recommended for Direct Substitution: P1171.274NLT and P1170.274NLT

These Pulse Electronics wirewound inductors feature 910 mA current ratings, exceeding the original 750 mA specification. While higher current capacity is generally acceptable, the package dimensions increase to 12.24mm × 12.24mm, potentially requiring PCB layout modifications. These parts are suitable only when PCB space permits and higher current margin is desired.

Frequently Asked Questions (FAQ)

Q: Can CDRH125NP-271MC directly replace CDRH125-271MC without PCB modification?

A: Yes. The CDRH125NP-271MC maintains identical package dimensions (12.00mm × 12.00mm × 6.00mm), electrical specifications (270 µH, 750 mA, 460 mOhm DCR), and shielded surface mount configuration. No PCB layout changes are required.

Q: What is the significance of the DCR specification in substitute selection?

A: DC Resistance directly affects power dissipation and thermal performance. The original CDRH125-271MC specifies 460 mOhm maximum. Substitute parts must not exceed this value to maintain equivalent thermal characteristics. The SPD125R-274M at 510 mOhm represents a 10.9% increase in resistance and corresponding power loss.

Q: Are the Pulse Electronics P1171.274NLT and P1170.274NLT suitable substitutes?

A: These parts provide functional equivalence with higher current ratings (910 mA vs. 750 mA) and extended temperature ranges. However, package dimensions increase to 12.24mm × 12.24mm, requiring PCB layout verification. Use only when circuit design accommodates the dimensional change and higher current margin is beneficial.

Q: What is the impact of operating temperature range differences?

A: The original CDRH125-271MC operates from -25°C to 80°C. All recommended substitutes extend this range to at least -40°C to 100°C or beyond. Extended temperature ranges provide design margin but do not affect compatibility if the original operating envelope is maintained within the substitute's specification.

Q: Does RoHS compliance affect electrical performance?

A: RoHS3 compliance indicates lead-free construction and restricted hazardous substance compliance. This is a regulatory and environmental specification, not an electrical performance parameter. All active substitute parts are RoHS3 compliant, making them suitable for modern manufacturing and end-of-life requirements.

Q: Can substitute parts with higher current ratings be used in place of the 750 mA rated CDRH125-271MC?

A: Yes. Higher current ratings provide additional thermal and electrical margin. Parts such as P1171.274NLT and P1170.274NLT rated at 910 mA are functionally acceptable. Verify that package dimensions accommodate PCB layout constraints before selection.

Q: What packaging format differences exist among substitute parts?

A: The original CDRH125-271MC is supplied in standard packaging. Direct substitute CDRH125NP-271MC is available in Tape & Reel (TR) format. PA4304.274NLT and SPD125R-274M are also supplied in Tape & Reel. Verify packaging format compatibility with assembly equipment and procurement requirements.

Q: Is the ferrite core material in PA4304.274NLT and SPD125R-274M equivalent to the original part?

A: The original CDRH125-271MC core material is not specified in the provided data. The PA4304.274NLT and SPD125R-274M explicitly specify ferrite drum core construction. Both maintain identical inductance, current rating, and DCR specifications, indicating functional equivalence for the specified electrical performance.

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