SDH2812-8R2-R Equivalent & Substitute Parts

Part Overview

The SDH2812-8R2-R is an 8.17 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 660 mA continuous current with a maximum DC resistance of 417 mOhm and operates across the temperature range of -40°C to 125°C. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity.

Substiute Parts

SDH2812-8R2-R

Eaton - Electronics DivisionIn Stock: 1040SDH2812-8R2-R Datasheet

Current PartRFQ

CDRH2D14NP-8R2NC

Sumida America Components Inc.In Stock: 758CDRH2D14NP-8R2NC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SDH2812-8R2-R is determined by the following critical parameters:

Inductance Value: The substitute part must operate at 8.17 µH ±20% (main part tolerance). The CDRH2D14NP-8R2NC provides 8.2 µH, which falls within acceptable inductance variance for this application category.

Current Rating: The main part supports 660 mA continuous current. The substitute part must maintain or exceed this rating. The CDRH2D14NP-8R2NC is rated for 800 mA, providing adequate current capacity.

DC Resistance: The main part specifies 417 mOhm maximum. The substitute part CDRH2D14NP-8R2NC provides 281 mOhm maximum, which is lower and therefore acceptable for applications where DCR is a limiting factor.

Core Material and Shielding: Both parts utilize ferrite core material with shielding, ensuring electromagnetic compatibility and performance consistency.

Mounting and Package Type: Both parts are surface mount components with nonstandard package dimensions, compatible with the same assembly processes.

Temperature Range: The main part operates -40°C to 125°C. The substitute part operates -40°C to 100°C, which covers the lower temperature bound but has a reduced upper limit of 25°C.

Parameter Comparison

Engineering Selection Recommendations

The CDRH2D14NP-8R2NC from Sumida America Components Inc. is an active production substitute for the obsolete SDH2812-8R2-R. Selection of this substitute is based on the following engineering criteria:

Product Status: The main part is obsolete, while the substitute is in active production, ensuring long-term availability and supply chain continuity.

Electrical Compatibility: The substitute meets or exceeds all critical electrical parameters. The inductance value of 8.2 µH is within acceptable variance of the 8.17 µH specification. The current rating of 800 mA exceeds the 660 mA requirement, and the lower DC resistance of 281 mOhm provides improved efficiency compared to the 417 mOhm maximum of the original part.

Thermal Considerations: The substitute operates to 100°C maximum, compared to the original part's 125°C upper limit. Applications requiring operation above 100°C require evaluation against actual thermal requirements.

Physical Dimensions: The substitute is 0.35mm taller (1.55mm vs. 1.20mm) and 0.2mm wider (3.00mm x 3.00mm vs. 3.00mm x 2.80mm). PCB layout and clearance verification is necessary to confirm mechanical compatibility.

Compliance: The substitute is RoHS3 compliant, meeting current regulatory requirements for electronic components.

Frequently Asked Questions (FAQ)

Q: Can the CDRH2D14NP-8R2NC directly replace the SDH2812-8R2-R without circuit modification?

A: The substitute part is electrically compatible for applications operating at or below 100°C. The inductance values are within acceptable tolerance variance at the 100 kHz test frequency. Physical dimensions differ slightly; PCB layout must accommodate the increased height and width.

Q: What is the significance of the inductance tolerance difference (±20% vs. ±30%)?

A: The main part specifies ±20% tolerance, while the substitute specifies ±30%. For circuits with tight inductance requirements, the wider tolerance of the substitute may introduce greater variation in circuit performance. Circuit simulation or testing is appropriate for applications sensitive to inductance variance.

Q: Why is the DC resistance of the substitute lower than the original part?

A: Lower DC resistance (281 mOhm vs. 417 mOhm) reduces resistive losses in the inductor, resulting in improved efficiency and reduced heat generation. This is a beneficial characteristic for most applications.

Q: Are there thermal limitations when using the substitute?

A: The substitute is rated to 100°C maximum, compared to the original part's 125°C. Applications requiring sustained operation above 100°C must use the original part or identify alternative inductors with higher temperature ratings.

Q: What packaging differences exist between these parts?

A: The main part is supplied in standard inventory form. The substitute is supplied in Tape & Reel (TR) packaging, which is standard for automated assembly processes. Both parts are classified as nonstandard package types.

Q: Is the substitute RoHS compliant?

A: Yes, the CDRH2D14NP-8R2NC is RoHS3 compliant. The original part's RoHS status is not specified in the provided data.

Q: How do the saturation current ratings compare?

A: The main part has a saturation current of 780 mA, while the substitute is rated at 800 mA. Both values exceed the continuous current rating of 660 mA, providing adequate margin for transient current conditions.