CDH38D09NP-4R7MC Equivalent & Substitute Parts

Part Overview

The CDH38D09NP-4R7MC is a 4.7 µH unshielded drum core wirewound inductor manufactured by Sumida America Components Inc., rated for 950 mA continuous current with a maximum DC resistance of 300mOhm. This component is classified as obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications requiring this inductance value and current rating in surface mount form factor.

Substiute Parts

CDH38D09NP-4R7MC

Sumida America Components Inc.In Stock: 935CDH38D09NP-4R7MC Datasheet

Current PartRFQ

ASPI-0412FS-4R7M-T4

Abracon LLCIn Stock: 924ASPI-0412FS-4R7M-T4 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CDH38D09NP-4R7MC is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 4.7 µH (exact match required)
• Inductance tolerance: ±20% (matching tolerance band)
• Current rating: minimum 950 mA continuous
• Mounting type: Surface Mount
• Package form factor: Nonstandard (3.80mm x 3.80mm footprint)

Secondary Compatibility Factors:

• DC resistance within acceptable operating limits
• Operating temperature range compatibility
• RoHS3 compliance for regulatory alignment
• Saturation current (Isat) sufficient for application demands

The substitute part ASPI-0412FS-4R7M-T4 meets the primary inductance and current requirements with enhanced specifications in current rating and saturation performance. Core material differs (Nickel Zinc Ferrite vs. Ferrite), and shielding configuration differs (Shielded vs. Unshielded), which may affect electromagnetic interference characteristics in the application circuit.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The ASPI-0412FS-4R7M-T4 from Abracon LLC is a viable substitute for the obsolete CDH38D09NP-4R7MC based on the following engineering factors:

1. Electrical Compatibility: Both components provide 4.7 µH inductance with ±20% tolerance. The substitute offers superior current handling (1.05 A vs. 950 mA) and lower DC resistance (228mOhm vs. 300mOhm), resulting in reduced power dissipation and improved thermal performance.

2. Product Status Advantage: The substitute part maintains Active product status, ensuring long-term availability and supply chain continuity compared to the Obsolete status of the original part.

3. Regulatory Compliance: Both parts are ROHS3 compliant and carry MSL Level 1 rating, meeting environmental and moisture sensitivity requirements.

4. Physical Footprint: Dimensional variations are minor (3.80mm to 4.00mm length/width; 1.00mm to 1.20mm height). PCB layout verification is required to confirm clearance compatibility.

5. Design Considerations: The substitute features shielded construction versus unshielded original design. This difference affects electromagnetic interference characteristics and must be evaluated within the specific application circuit context. The Nickel Zinc Ferrite core material in the substitute may exhibit different frequency response characteristics compared to the standard Ferrite core of the original part.

6. Temperature Range: The substitute supports an extended operating temperature range (-25°C to 125°C vs. -40°C to 105°C), providing additional thermal margin for demanding applications.

Frequently Asked Questions (FAQ)

Q1: Can the ASPI-0412FS-4R7M-T4 be used as a direct replacement for CDH38D09NP-4R7MC?

A: The ASPI-0412FS-4R7M-T4 meets the core electrical requirements (4.7 µH inductance, ±20% tolerance, and exceeds the 950 mA current rating). However, direct replacement requires verification of three factors: (1) PCB footprint clearance due to minor dimensional differences, (2) electromagnetic compatibility due to shielded vs. unshielded configuration, and (3) frequency response characteristics due to different core materials.

Q2: What are the key differences between these two inductors?

A: The primary differences are: (1) Shielding configuration (unshielded vs. shielded), (2) Core material (Ferrite vs. Nickel Zinc Ferrite), (3) DC resistance (300mOhm vs. 228mOhm), (4) Physical dimensions (3.80mm vs. 4.00mm), (5) Product status (Obsolete vs. Active), and (6) Operating temperature range (-40°C to 105°C vs. -25°C to 125°C).

Q3: Will the lower DC resistance of the substitute part affect circuit performance?

A: Lower DC resistance (228mOhm vs. 300mOhm) reduces power dissipation and heat generation, which is generally beneficial. However, this change may slightly alter circuit impedance characteristics and should be evaluated in the context of the specific application circuit design.

Q4: Does the shielded design of the substitute part create compatibility issues?

A: Shielded construction reduces electromagnetic radiation and susceptibility to external interference. In applications where the original unshielded design was intentional, the shielded substitute may alter circuit behavior. Circuit-level testing is necessary to confirm functional equivalence.

Q5: Are there packaging differences between these parts?

A: The main part is supplied in standard packaging format, while the substitute (ASPI-0412FS-4R7M-T4) is supplied in Tape & Reel (TR) format. This affects handling, storage, and assembly processes but does not impact component functionality.

Q6: What is the significance of the different core materials?

A: The original part uses standard Ferrite core material, while the substitute uses Nickel Zinc Ferrite (NiZn). NiZn ferrite typically exhibits different permeability and frequency response characteristics. Applications sensitive to frequency-dependent behavior should evaluate this difference through circuit simulation or testing.

Q7: Is the substitute part RoHS compliant?

A: Yes, the ASPI-0412FS-4R7M-T4 is ROHS3 compliant, matching the compliance status of the original CDH38D09NP-4R7MC.