SD3812-680-R Equivalent & Substitute Parts Reference

Part Overview

The SD3812-680-R is a 68 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 269 mA continuous current with a DC resistance of 2.666 Ohm and operates across the temperature range of -40°C to 85°C. The part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support and procurement continuity. Substitute parts must maintain the 68 µH inductance specification while accommodating variations in current ratings, DC resistance, and operating temperature ranges within acceptable engineering tolerances.

Substiute Parts

SD3812-680-R

Eaton - Electronics DivisionIn Stock: 939SD3812-680-R Datasheet

Current PartRFQ

SRR3011-680YL

Bourns Inc.In Stock: 715SRR3011-680YL Datasheet

SimilarRFQ

TYS4018680M-10

Laird-Signal Integrity ProductsIn Stock: 1131TYS4018680M-10 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SD3812-680-R is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value of 68 µH at 100 kHz test frequency
• Shielded construction to maintain electromagnetic isolation
• Surface mount configuration with nonstandard package footprint
• Ferrite core material composition

Secondary Compatibility Factors:

• Current rating must equal or exceed 269 mA continuous operation
• DC resistance variation acceptable within circuit design margins
• Operating temperature range must encompass -40°C to 85°C minimum
• Saturation current (Isat) must support circuit peak current demands
• Moisture sensitivity level MSL 1 (Unlimited) for storage and handling

The substitute parts SRR3011-680YL and TYS4018680M-10 both maintain the 68 µH inductance specification and shielded surface mount configuration. Variations in current ratings, DC resistance, and operating temperature ranges reflect different design trade-offs suitable for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

SRR3011-680YL (Bourns Inc.) - Active Product Status

The SRR3011-680YL maintains the 68 µH inductance specification with ±30% tolerance and operates across -40°C to 125°C, exceeding the original operating temperature range. Current rating of 220 mA is lower than the SD3812-680-R by 49 mA, requiring circuit evaluation for applications demanding the full 269 mA continuous current. DC resistance of 2.25 Ohm Max provides improved performance over the original 2.666 Ohm specification. The SRR3011-680YL is ROHS3 compliant and REACH unaffected, supporting modern regulatory requirements. Footprint dimensions of 3.80mm x 3.80mm are slightly smaller than the original, with height of 1.30 mm. This substitute is suitable for applications where current requirements do not exceed 220 mA and extended temperature operation to 125°C is beneficial.

TYS4018680M-10 (Laird-Signal Integrity Products) - Active Product Status

The TYS4018680M-10 maintains the 68 µH inductance specification with ±20% tolerance and operates across -40°C to 125°C. Current rating of 320 mA exceeds the original SD3812-680-R by 51 mA, providing margin for applications requiring higher current capacity. DC resistance of 1 Ohm Max represents significant improvement over the original 2.666 Ohm specification, reducing power dissipation. Saturation current (Isat) of 470 mA provides substantial headroom above the original 299 mA. The TYS4018680M-10 is ROHS3 compliant and REACH unaffected. Footprint dimensions match the original at 4.00mm x 4.00mm, but height of 2.00 mm exceeds the original 1.20 mm, requiring PCB layout verification. This substitute is suitable for applications requiring higher current capacity and lower DC resistance with extended temperature operation.

Both substitute parts are active products with current manufacturing support, addressing the obsolescence of the SD3812-680-R. Selection between substitutes depends on specific circuit current requirements, thermal dissipation constraints, and available PCB height clearance.

Frequently Asked Questions (FAQ)

Q: Can the SRR3011-680YL replace the SD3812-680-R in all applications?

A: The SRR3011-680YL maintains the 68 µH inductance and shielded construction. However, the current rating of 220 mA is 49 mA lower than the original 269 mA specification. Substitution is valid only for applications where continuous current does not exceed 220 mA. Circuit analysis is required to confirm current requirements.

Q: What are the key differences between the two substitute parts?

A: The SRR3011-680YL (Bourns) provides lower DC resistance (2.25 Ohm Max) and operates to 125°C with a smaller footprint (3.80mm x 3.80mm) but lower current rating (220 mA). The TYS4018680M-10 (Laird) provides higher current rating (320 mA), significantly lower DC resistance (1 Ohm Max), and operates to 125°C but requires greater PCB height clearance (2.00 mm vs. 1.20 mm).

Q: Are there PCB layout considerations when substituting these parts?

A: Yes. The SRR3011-680YL has a smaller footprint (3.80mm x 3.80mm vs. 4.00mm x 4.00mm) and slightly greater height (1.30 mm vs. 1.20 mm). The TYS4018680M-10 maintains the original footprint but requires significantly greater height clearance (2.00 mm vs. 1.20 mm). PCB layout verification is mandatory before component substitution.

Q: Do the substitute parts meet modern regulatory requirements?

A: Both SRR3011-680YL and TYS4018680M-10 are ROHS3 compliant and REACH unaffected, meeting current regulatory standards. The original SD3812-680-R is obsolete and no longer manufactured.

Q: What is the impact of DC resistance differences on circuit performance?

A: The SRR3011-680YL (2.25 Ohm Max) and TYS4018680M-10 (1 Ohm Max) both provide lower DC resistance than the original 2.666 Ohm specification. Lower DC resistance reduces power dissipation and heat generation. Circuit analysis is required to confirm acceptable performance with modified DC resistance values.

Q: Can I use the TYS4018680M-10 in applications requiring only 220 mA current?

A: Yes. The TYS4018680M-10 is rated for 320 mA continuous current, providing margin for applications requiring lower current. The higher current rating does not create compatibility issues in lower-current applications.

Q: What is the significance of inductance tolerance differences?

A: The SD3812-680-R specifies ±15% tolerance, the SRR3011-680YL specifies ±30%, and the TYS4018680M-10 specifies ±20%. Wider tolerance ranges may affect circuit performance in applications with tight inductance requirements. Circuit analysis is required to confirm acceptable performance with modified tolerance specifications.