CDH37D10SLDNP-2R2MC Equivalent & Substitute Parts

Part Overview

The CDH37D10SLDNP-2R2MC is a 2.2 µH unshielded surface mount inductor manufactured by Sumida America Components Inc. with a current rating of 2.05 A and maximum DC resistance of 87.3 mOhm. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing production and maintenance applications. The part is RoHS3 compliant with MSL 1 rating, indicating unlimited moisture sensitivity tolerance.

Substiute Parts

CDH37D10SLDNP-2R2MC

Sumida America Components Inc.In Stock: 883CDH37D10SLDNP-2R2MC Datasheet

Current PartRFQ

SRN4026-2R2Y

Bourns Inc.In Stock: 21714SRN4026-2R2Y Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CDH37D10SLDNP-2R2MC is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 2.2 µH at 100 kHz test frequency
• Current rating: minimum 2.05 A continuous operation
• Saturation current: minimum 1.52 A
• Surface mount package compatibility
• RoHS3 compliance and MSL 1 rating

Secondary Compatibility Factors:

• DC resistance must not exceed application thermal and efficiency requirements
• Shielding configuration (unshielded to semi-shielded acceptable for non-EMI-critical applications)
• Physical footprint accommodation within PCB layout constraints
• Operating temperature range compatibility

The substitute part SRN4026-2R2Y meets the primary inductance and current specifications while offering improved DC resistance characteristics and active product status.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility: SRN4026-2R2Y

The SRN4026-2R2Y from Bourns Inc. is a direct functional substitute for the obsolete CDH37D10SLDNP-2R2MC based on the following engineering criteria:

Electrical Compatibility:

• Identical inductance value of 2.2 µH at 100 kHz test frequency
• Current rating of 2.1 A exceeds the original 2.05 A requirement
• Saturation current of 2.1 A provides improved margin over the original 1.52 A specification
• DC resistance of 29 mOhm is significantly lower than the original 87.3 mOhm, resulting in reduced power dissipation and improved efficiency

Regulatory & Compliance Status:

• Both parts are RoHS3 compliant
• Both parts carry MSL 1 rating with unlimited moisture sensitivity tolerance
• SRN4026-2R2Y is active product status with established supply chain availability

Physical Considerations:

• Package footprint is compatible with 4.00mm x 4.00mm PCB land pattern
• Height increase from 1.20mm to 2.50mm requires clearance verification in the application
• Semi-shielded configuration of the substitute provides improved EMI performance compared to unshielded original

Operational Advantages:

• Defined operating temperature range of -40°C to 125°C provides explicit thermal specification
• Ferrite drum core construction with wirewound design offers superior performance characteristics
• Q factor of 9 at 7.96 MHz and self-resonant frequency of 60 MHz enable higher frequency operation

Frequently Asked Questions (FAQ)

Q: Can the SRN4026-2R2Y directly replace the CDH37D10SLDNP-2R2MC without circuit modifications?

A: The SRN4026-2R2Y meets all primary electrical specifications for the CDH37D10SLDNP-2R2MC. However, the increased height (2.50mm vs. 1.20mm) requires verification of PCB clearance. The lower DC resistance of 29 mOhm versus 87.3 mOhm will reduce power dissipation, which is beneficial for thermal performance. The semi-shielded configuration may affect EMI characteristics in sensitive applications; circuit-level EMI testing is recommended if the original unshielded design was critical to system performance.

Q: What is the significance of the inductance tolerance difference between ±20% and ±30%?

A: The original CDH37D10SLDNP-2R2MC specifies ±20% tolerance, while the SRN4026-2R2Y specifies ±30% tolerance. This wider tolerance in the substitute part means the actual inductance value may deviate further from the nominal 2.2 µH. Applications with tight inductance requirements should include component sorting or circuit tuning provisions to accommodate this tolerance variation.

Q: How does the DC resistance difference affect circuit performance?

A: The SRN4026-2R2Y has significantly lower DC resistance (29 mOhm) compared to the original (87.3 mOhm). This 66% reduction in resistance decreases I²R power losses, resulting in lower heat generation and improved efficiency. In current-limiting or power-dissipation-sensitive applications, this improvement is advantageous. However, if the original design relied on the higher resistance for current limiting or thermal management, circuit analysis is required.

Q: Are there any shielding considerations when substituting from unshielded to semi-shielded?

A: The original CDH37D10SLDNP-2R2MC is unshielded, while the SRN4026-2R2Y is semi-shielded. Semi-shielding reduces radiated EMI emissions and improves immunity to external electromagnetic interference. In most applications, this is beneficial. However, if the circuit design specifically requires an unshielded inductor for coupling purposes, the semi-shielded substitute may alter circuit behavior. EMI and coupling characteristics should be evaluated in the specific application context.

Q: What is the impact of the saturation current difference?

A: The original part has Isat of 1.52 A, while the substitute has Isat of 2.1 A. Saturation current represents the current level at which the inductor's inductance begins to degrade significantly. The substitute's higher saturation current provides greater headroom before inductance degradation occurs, offering improved performance margin in transient or peak current conditions.

Q: Is the package size increase from 4.00mm x 3.70mm to 4.00mm x 4.00mm critical?

A: The length remains 4.00mm, but width increases from 3.70mm to 4.00mm, and height increases from 1.20mm to 2.50mm. The width increase of 0.30mm is minimal and typically accommodated by standard PCB land patterns. The height increase of 1.30mm requires verification of clearance above the component. If vertical space is constrained, this may present a physical limitation.

Q: What supply chain advantages does the SRN4026-2R2Y offer?

A: The SRN4026-2R2Y is classified as active product status with 21,671 pieces in stock, compared to the obsolete CDH37D10SLDNP-2R2MC with 823 pieces. Active product status ensures long-term availability, established distribution channels, and consistent manufacturing processes. This provides supply chain security for ongoing production and future maintenance requirements.