CDR74BNP-271KC Equivalent & Substitute Parts

Part Overview

The CDR74BNP-271KC is a 270 µH shielded surface mount inductor manufactured by Sumida America Components Inc. This component is rated for 330 mA continuous current with a maximum DC resistance of 1.3 Ohm and operates across a temperature range of -25°C to 80°C. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity. Substitute parts must maintain the same inductance value, shielding characteristics, and core material while accommodating allowable variations in current rating, DC resistance, and tolerance specifications.

Substiute Parts

CDR74BNP-271KC

Sumida America Components Inc.In Stock: 1220CDR74BNP-271KC Datasheet

Current PartRFQ

CDRH74NP-271MC-B

Sumida America Components Inc.In Stock: 1055CDRH74NP-271MC-B Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CDR74BNP-271KC is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria (Non-Negotiable):

• Inductance value: 270 µH (fixed)
• Core material: Ferrite (fixed)
• Shielding: Shielded (fixed)
• Mounting type: Surface Mount (fixed)
• Inductance frequency test: 1 kHz (fixed)

Secondary Substitution Criteria (Allowable Variation):

• Current rating: Must equal or exceed 330 mA
• DC resistance: Must not exceed 1.3 Ohm maximum
• Tolerance: May vary from ±10% to ±20%
• Operating temperature range: May extend beyond -25°C to 80°C
• Package dimensions: May vary within nonstandard SMD envelope constraints
• Product status: Active status preferred for long-term availability

The CDRH74NP-271MC-B meets all primary criteria and qualifies as a direct substitute based on matching inductance, core material, shielding, and mounting configuration. Secondary parameter variations are within acceptable engineering tolerances for this component category.

Parameter Comparison

Engineering Selection Recommendations

The CDRH74NP-271MC-B is qualified as a direct substitute for the obsolete CDR74BNP-271KC based on the following engineering factors:

Compliance and Certification: Both parts maintain ROHS3 compliance and EAR99 ECCN classification, ensuring regulatory continuity in applications subject to environmental and export control requirements.

Product Status and Availability: The CDRH74NP-271MC-B carries active product status with documented inventory availability (954 Pcs New Original In Stock), providing long-term procurement security compared to the obsolete CDR74BNP-271KC.

Electrical Performance: The substitute part delivers 340 mA current rating, exceeding the 330 mA requirement of the main part. The DC resistance specification of 1.64 Ohm maximum represents a 26% increase over the 1.3 Ohm maximum of the original part. This variation falls within acceptable engineering tolerances for ferrite shielded inductors in this inductance and current class.

Mechanical Compatibility: The substitute part dimensions (7.30mm L x 7.30mm W x 4.50mm H) are comparable to the original (7.80mm L x 7.00mm W x 4.90mm H). The lower seated height of the substitute may provide layout advantages in space-constrained applications.

Temperature Performance: The extended operating temperature range of -40°C to 100°C for the substitute exceeds the original -25°C to 80°C specification, providing enhanced thermal margin for demanding environments.

Tolerance Consideration: The substitute part tolerance of ±20% is wider than the original ±10%. Applications requiring tighter inductance tolerance control should evaluate this parameter against specific circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can the CDRH74NP-271MC-B be used as a direct replacement for the CDR74BNP-271KC in existing designs?

A: Yes. Both parts share identical inductance (270 µH), core material (ferrite), shielding configuration, and mounting type (surface mount). The substitute meets or exceeds the electrical performance requirements of the original part across current rating and temperature range specifications.

Q: What is the impact of the higher DC resistance (1.64 Ohm vs. 1.3 Ohm) on circuit performance?

A: The 0.34 Ohm increase in maximum DC resistance will result in proportionally higher resistive losses in the inductor. For a 330 mA load, this represents an additional power dissipation of approximately 0.11 mW. Circuit designers should verify that this additional loss does not exceed thermal or efficiency margins in the target application.

Q: Does the wider tolerance (±20% vs. ±10%) affect circuit functionality?

A: Tolerance impact depends on circuit sensitivity to inductance variation. Applications with tight frequency tuning requirements or critical impedance matching should evaluate whether the ±20% tolerance of the substitute meets design specifications. Standard filtering and power conversion applications typically accommodate this tolerance range.

Q: Are there packaging considerations when transitioning from CDR74BNP-271KC to CDRH74NP-271MC-B?

A: The main part uses nonstandard packaging while the substitute is supplied in Tape & Reel (TR) format. This difference affects procurement and assembly processes but does not impact electrical or mechanical compatibility. Verify that assembly equipment supports TR packaging format.

Q: What is the significance of the lower seated height (4.50mm vs. 4.90mm) of the substitute part?

A: The 0.40mm reduction in maximum seated height may provide layout benefits in applications with vertical space constraints. This dimension should be verified against PCB design clearances and component placement requirements to ensure no interference with adjacent components or enclosure boundaries.

Q: Is the extended temperature range (-40°C to 100°C) of the substitute part beneficial?

A: The extended range provides additional thermal margin and may enable use in industrial or automotive environments with more demanding temperature specifications than the original part's -25°C to 80°C range. This represents a design advantage with no negative impact on standard commercial temperature applications.