SDH2812-470-R Equivalent & Substitute Parts

Part Overview

The SDH2812-470-R is a 46.7 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 300 mA continuous current with a maximum DC resistance of 1.99 Ohm 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.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Inductance	46.7	µH	Critical - Must match within tolerance
Current Rating	300	mA	Critical - Minimum acceptable rating
DC Resistance (DCR)	1.99	Ohm Max	Critical - Affects power dissipation
Tolerance	±20%	%	Critical - Defines acceptable inductance range
Core Type	Ferrite Drum Core	-	Critical - Determines shielding and performance
Shielding	Shielded	-	Critical - EMI containment requirement
Mounting Type	Surface Mount	-	Critical - PCB assembly compatibility
Operating Temperature	-40 to 125	°C	Important - Environmental compatibility
Package Type	Nonstandard	-	Important - Physical footprint

Substitute Part Grouping Explanation

Substitution eligibility for the SDH2812-470-R is determined by the following criteria:

Inductance Compatibility: The substitute part must deliver inductance within the ±20% tolerance band of the main part. The SDH2812-470-R specifies 46.7 µH; therefore, acceptable inductance values range from 37.36 µH to 56.04 µH.

Current Rating: The substitute must support a continuous current rating equal to or greater than 300 mA to ensure safe operation under identical load conditions.

DC Resistance: The substitute's maximum DC resistance must not exceed 1.99 Ohm to maintain equivalent power dissipation characteristics and thermal performance.

Core Material and Shielding: Both the main part and substitute must employ ferrite drum core construction with shielding to preserve electromagnetic containment and frequency response.

Mounting and Package: Surface mount configuration is mandatory. Physical dimensions must be compatible with the original PCB footprint (0.118" L x 0.110" W, height 0.047" max).

Operating Temperature Range: The substitute must support the full -40°C to 125°C operating window.

Test Frequency: Inductance measurement at 100 kHz ensures consistent comparison methodology.

Parameter Comparison

Parameter	SDH2812-470-R (Main)	TYS3012470M-10 (Substitute)	Compatibility Status
Inductance	46.7 µH	47 µH	Compatible (within ±20% tolerance)
Inductance Tolerance	±20%	±20%	Matched
Current Rating	300 mA	350 mA	Compatible (higher rating acceptable)
DC Resistance (DCR)	1.99 Ohm Max	1.885 Ohm Max	Compatible (lower DCR acceptable)
Core Type	Ferrite Drum Core	Ferrite Drum Core	Matched
Shielding	Shielded	Shielded	Matched
Mounting Type	Surface Mount	Surface Mount	Matched
Operating Temperature	-40°C to 125°C	-40°C to 125°C	Matched
Inductance Test Frequency	100 kHz	100 kHz	Matched
Size / Dimension	0.118" L x 0.110" W (3.00mm x 2.80mm)	0.118" L x 0.118" W (3.00mm x 3.00mm)	Compatible (minimal dimensional variance)
Height - Seated (Max)	0.047" (1.20mm)	0.055" (1.40mm)	Compatible (within typical PCB clearance)
Product Status	Obsolete	Active	Substitute is actively manufactured

Engineering Selection Recommendations

The TYS3012470M-10 manufactured by Laird-Signal Integrity Products qualifies as a functional equivalent to the obsolete SDH2812-470-R based on the following engineering criteria:

Electrical Equivalence: The substitute delivers 47 µH inductance, which falls within the ±20% tolerance specification of the main part (46.7 µH ±20% = 37.36–56.04 µH range). The current rating of 350 mA exceeds the 300 mA requirement, and the DC resistance of 1.885 Ohm is lower than the 1.99 Ohm maximum, resulting in improved thermal performance.

Physical Compatibility: Both components employ identical surface mount technology with ferrite drum core shielded construction. Dimensional differences are minimal: the substitute is 0.008" wider (3.00mm vs 2.80mm) and 0.008" taller (1.40mm vs 1.20mm). These variations remain within standard PCB design tolerances for surface mount assembly.

Product Status and Availability: The TYS3012470M-10 is classified as active product with confirmed inventory availability (681 pieces in stock), ensuring procurement reliability for ongoing production and field service applications.

Compliance and Certification: The substitute carries RoHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements. Both parts share identical ECCN classification (EAR99) and moisture sensitivity level (MSL 1 - Unlimited).

Frequency Performance: The substitute specifies a self-resonant frequency of 14 MHz, providing additional technical documentation compared to the main part. Inductance measurement at 100 kHz ensures direct comparison validity.

Frequently Asked Questions (FAQ)

Q: Can the TYS3012470M-10 be used as a direct replacement for the SDH2812-470-R in existing designs?

A: Yes. The substitute meets all critical electrical parameters (inductance within tolerance, equal or superior current rating, lower DC resistance) and maintains identical mounting type, core material, shielding, and operating temperature range. Minimal dimensional variance (0.008" width and height differences) is compatible with standard PCB design tolerances.

Q: What is the inductance tolerance range for both parts?

A: Both the SDH2812-470-R and TYS3012470M-10 specify ±20% tolerance. For the main part at 46.7 µH, the acceptable range is 37.36–56.04 µH. The substitute at 47 µH falls within this range and also within its own tolerance band of 37.6–56.4 µH.

Q: How do the DC resistance values compare, and does the difference matter?

A: The main part specifies 1.99 Ohm maximum; the substitute specifies 1.885 Ohm maximum. Lower DC resistance in the substitute results in reduced power dissipation and improved thermal performance under identical current conditions. This represents an improvement over the original specification.

Q: Are there packaging differences between these parts?

A: The main part is listed as nonstandard packaging. The substitute is supplied in Tape & Reel (TR) format with a supplier device package designation of 3012. Both use surface mount technology. The TR packaging is standard for high-volume production and field service applications.

Q: What is the saturation current difference, and is it significant?

A: The main part specifies saturation current (Isat) of 320 mA; the substitute specifies 270 mA. Since both parts are rated for 300 mA continuous operation, the substitute's lower saturation point requires verification that circuit peak current transients do not exceed 270 mA. If circuit design maintains operation below this threshold, the substitute is suitable.

Q: Do both parts meet current environmental and regulatory standards?

A: The substitute (TYS3012470M-10) carries active RoHS3 compliance and REACH unaffected certification. The main part (SDH2812-470-R) is obsolete and no longer manufactured. For new designs or field replacements requiring current compliance documentation, the substitute is the appropriate selection.

Q: What are the self-resonant frequency specifications?

A: The main part does not specify self-resonant frequency. The substitute specifies 14 MHz. This additional technical data for the substitute provides better characterization for high-frequency circuit applications but does not affect substitution validity for standard inductor applications.

Q: Are there any restrictions on using the substitute in specific circuit topologies?

A: No restrictions are indicated based on provided parameters. Both parts are shielded ferrite drum core inductors suitable for general-purpose surface mount applications. Circuit-specific validation should follow standard engineering practice for any component substitution.

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