CDRH127/LDNP-271MC Equivalent & Substitute Parts

Part Overview

The CDRH127/LDNP-271MC is a 270 µH shielded surface mount inductor manufactured by Sumida America Components Inc. This fixed inductor is designed for applications requiring moderate inductance values with current handling up to 1.3 A. The component features ferrite core construction with shielding to minimize electromagnetic interference. The part is currently active in production and maintains ROHS3 compliance. Substitute parts are identified when original inventory becomes unavailable or when design requirements permit alternative specifications within acceptable electrical and mechanical tolerances.

Substiute Parts

CDRH127/LDNP-271MC

Sumida America Components Inc.In Stock: 808CDRH127/LDNP-271MC Datasheet

Current PartRFQ

SRR1280-271K

Bourns Inc.In Stock: 1451SRR1280-271K Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CDRH127/LDNP-271MC are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Inductance value: 270 µH (exact match required)
• Core material: Ferrite shielded construction
• Mounting type: Surface mount
• Package classification: Nonstandard form factor
• RoHS compliance: ROHS3 Compliant

Secondary Compatibility Parameters:

• Current rating: Minimum 1.2 A (substitute must support circuit current requirements)
• DC resistance: Maximum 450 mOhm (acceptable variance for thermal and efficiency considerations)
• Operating temperature range: Minimum -40°C to 100°C overlap
• Moisture sensitivity: MSL 1 classification

The SRR1280-271K from Bourns Inc. meets all primary matching criteria and maintains compatibility within secondary parameters. The substitute exhibits slightly higher DC resistance (450 mOhm vs. 419 mOhm) and marginally lower current rating (1.2 A vs. 1.3 A), which are acceptable variations for most applications within the specified inductance and core material class.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (CDRH127/LDNP-271MC): Select the original Sumida part when inventory is available and current rating of 1.3 A is required. This part maintains the lowest DC resistance specification (419 mOhm Max) and the exact package footprint (12.00 mm × 12.00 mm). Both parts are ROHS3 compliant and MSL 1 rated, ensuring equivalent environmental and regulatory compliance.

Substitute Selection (SRR1280-271K): The Bourns SRR1280-271K is a qualified substitute when the original part is unavailable. This substitute is acceptable for applications where:

• Circuit peak current does not exceed 1.2 A
• PCB layout accommodates the slightly larger footprint (12.50 mm × 12.50 mm)
• The additional 31 mOhm DC resistance does not create unacceptable thermal or efficiency losses

Both parts maintain identical height (8.00 mm), identical inductance (270 µH), and identical shielding characteristics. The substitute offers improved tolerance (±10% vs. ±20%) and extended operating temperature range (-40°C to 125°C vs. -40°C to 100°C).

Frequently Asked Questions (FAQ)

Q: Can the SRR1280-271K directly replace the CDRH127/LDNP-271MC on the PCB?

A: Direct replacement requires PCB layout verification. The substitute is 0.5 mm larger in length and width (12.50 mm vs. 12.00 mm). Height remains identical at 8.00 mm maximum. Confirm adequate clearance around the component footprint before substitution.

Q: What is the impact of the 31 mOhm higher DC resistance in the substitute?

A: The SRR1280-271K exhibits 450 mOhm maximum DC resistance compared to 419 mOhm maximum in the original part. This 7.4% increase results in proportionally higher resistive losses. For a 1.2 A circuit, this translates to approximately 0.29 mW additional power dissipation. Evaluate thermal requirements for your specific application.

Q: Is the lower current rating of the substitute (1.2 A vs. 1.3 A) a limitation?

A: The substitute current rating of 1.2 A is acceptable if your circuit peak current does not exceed this value. If your design requires sustained operation above 1.2 A, the original CDRH127/LDNP-271MC is required. Verify actual circuit current requirements before selecting the substitute.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the CDRH127/LDNP-271MC and SRR1280-271K are ROHS3 compliant and rated MSL 1 (Unlimited moisture sensitivity level). Regulatory and environmental compliance are equivalent between the two parts.

Q: What is the difference in inductance tolerance between these parts?

A: The original Sumida part specifies ±20% tolerance, while the Bourns substitute specifies ±10% tolerance. The tighter tolerance of the substitute may provide improved circuit performance in applications sensitive to inductance variation, though both parts meet the 270 µH nominal specification.

Q: Are there any frequency-dependent differences between these inductors?

A: The original part was tested at 1 kHz inductance frequency, while the substitute was tested at 100 kHz. The substitute provides additional frequency characterization data (Q @ 796 kHz = 20, Self Resonant Frequency = 3.1 MHz). For applications operating at higher frequencies, the substitute's extended characterization data may be beneficial.