SDH2812-680-R Equivalent & Substitute Parts

Part Overview

The SDH2812-680-R is a 68 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 270 mA continuous current with a maximum DC resistance of 2.7 Ohm, operating across the temperature range of -40°C to 125°C. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support, production continuity, and component procurement.

Substiute Parts

SDH2812-680-R

Eaton - Electronics DivisionIn Stock: 826SDH2812-680-R Datasheet

Current PartRFQ

TYS3012680M-10

Laird-Signal Integrity ProductsIn Stock: 942TYS3012680M-10 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SDH2812-680-R is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Inductance value: 68 µH (matched exactly)
• Inductance tolerance: ±20% (matched exactly)
• Core type: Ferrite drum core, wirewound (matched exactly)
• Shielding: Shielded construction (matched exactly)
• Mounting: Surface mount technology (matched exactly)
• Operating temperature range: -40°C to 125°C (matched exactly)
• Test frequency: 100 kHz (matched exactly)

Secondary Compatibility Parameters:

• Current rating: Must meet or exceed 270 mA minimum
• DC resistance: Must not exceed 2.7 Ohm maximum
• Physical footprint: Must accommodate nonstandard package dimensions within PCB layout constraints
• Moisture sensitivity: MSL 1 or equivalent

The substitute part TYS3012680M-10 from Laird-Signal Integrity Products meets all primary criteria and demonstrates improved electrical performance in secondary parameters.

Parameter Comparison

Engineering Selection Recommendations

TYS3012680M-10 as Primary Substitute:

The TYS3012680M-10 is suitable as a direct substitute for the obsolete SDH2812-680-R based on the following engineering factors:

1. Electrical Equivalence: Both components share identical inductance (68 µH), tolerance (±20%), core material (ferrite), and test frequency (100 kHz). The substitute demonstrates superior DC resistance performance (2.171 Ohm vs. 2.7 Ohm maximum), reducing power dissipation in the application circuit.

2. Current Handling: The TYS3012680M-10 provides a higher continuous current rating (330 mA vs. 270 mA), offering design margin for the original application. However, the saturation current of the substitute (240 mA) is lower than the original part's 270 mA rating. Circuit designers must verify that peak current transients do not exceed 240 mA saturation threshold.

3. Product Status and Compliance: The substitute is classified as active product status, ensuring long-term availability and supply chain continuity. The part carries ROHS3 compliance certification, meeting current environmental and regulatory requirements.

4. Physical Compatibility: Both components use nonstandard surface mount packages with similar footprints (3.00 × 2.80 mm vs. 3.00 × 3.00 mm). The substitute exhibits a slightly increased seated height (1.40 mm vs. 1.20 mm), which must be verified against PCB clearance and assembly constraints.

5. Thermal and Environmental: Both parts operate across identical temperature ranges (-40°C to 125°C) and share MSL 1 moisture sensitivity classification, ensuring equivalent reliability in storage and field deployment.

Frequently Asked Questions (FAQ)

Q: Can TYS3012680M-10 be used as a direct replacement for SDH2812-680-R in existing designs?

A: Yes, with design verification. The substitute meets all primary electrical specifications (inductance, tolerance, core type, shielding, temperature range). However, the lower saturation current (240 mA vs. 270 mA) requires confirmation that circuit peak currents remain below this threshold. Physical height difference (1.40 mm vs. 1.20 mm) must be cleared against PCB assembly constraints.

Q: What is the impact of the DC resistance difference between these parts?

A: The TYS3012680M-10 exhibits lower DC resistance (2.171 Ohm max vs. 2.7 Ohm max), resulting in reduced resistive losses and lower heat generation. This represents an improvement over the original part specification and is compatible with circuit designs that tolerate the original resistance value.

Q: Are there any compliance or certification differences?

A: The substitute TYS3012680M-10 carries ROHS3 compliance certification, while the original SDH2812-680-R does not specify this status. Both parts are classified as MSL 1 (Unlimited moisture sensitivity) and operate across -40°C to 125°C. The substitute's active product status ensures ongoing manufacturer support and supply availability.

Q: How do the physical dimensions affect PCB layout?

A: The substitute is slightly larger in width (3.00 mm vs. 2.80 mm) and height (1.40 mm vs. 1.20 mm). PCB designs must verify that the increased footprint and height do not conflict with adjacent components, solder mask clearances, or assembly equipment clearances. The length remains identical at 3.00 mm.

Q: What is the significance of the 12 MHz self-resonant frequency specification?

A: The TYS3012680M-10 provides a specified self-resonant frequency of 12 MHz, which was not documented for the original part. This parameter defines the frequency above which the inductor transitions from inductive to capacitive behavior. Circuits operating near or above this frequency should account for this characteristic.

Q: Is packaging format a consideration for substitution?

A: The original SDH2812-680-R packaging format is not specified. The substitute TYS3012680M-10 is supplied in Tape & Reel (TR) format, which is standard for automated assembly. Verify that your procurement and assembly processes accommodate this packaging format.