SMP3316-681M Equivalent & Substitute Parts

Part Overview

The SMP3316-681M is a 6.8 µH unshielded molded inductor manufactured by Gowanda Electronics, designed for surface mount applications requiring 5 A current rating and low DC resistance of 20.2 mOhm maximum. This component is classified as Active product status with 735 units currently in stock. Alternative components become necessary when primary sourcing is unavailable, inventory constraints exist, or specific performance characteristics of substitute parts better align with application requirements.

Substiute Parts

SMP3316-681M

Gowanda ElectronicsIn Stock: 822SMP3316-681M Datasheet

Current PartRFQ

SDR1005-6R8ML

Bourns Inc.In Stock: 3128SDR1005-6R8ML Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMP3316-681M is determined by the following critical parameters:

• Inductance Value: Must match 6.8 µH with ±20% tolerance
• Current Rating: Minimum 5 A required; substitute parts with lower current ratings (3.4 A) do not meet this specification
• DC Resistance: Maximum 20.2 mOhm; higher DCR values increase power dissipation
• Shielding Type: Unshielded configuration required
• Mounting Type: Surface mount only
• Operating Temperature Range: Must support -55°C ~ 125°C minimum
• Package Classification: Nonstandard surface mount package

The SDR1005-6R8ML from Bourns Inc. shares the same inductance value and tolerance but presents a current rating of 3.4 A, which falls below the 5 A requirement of the main part. This difference represents a functional limitation that must be evaluated against specific application current demands.

Parameter Comparison

Engineering Selection Recommendations

SMP3316-681M (Primary Selection): Active product status with established supply chain. Meets full current rating specification of 5 A with lower DC resistance at 20.2 mOhm maximum. Supports extended operating temperature range from -55°C to 125°C. RoHS status listed as not applicable.

SDR1005-6R8ML (Conditional Substitute): Active product status with higher inventory availability (3052 units). ROHS3 compliant certification. Current rating of 3.4 A represents a 32% reduction from the main part specification. DC resistance of 30 mOhm maximum is 48% higher than the primary part, resulting in increased power dissipation. Operating temperature minimum of -40°C is 15°C higher than the main part. Physical dimensions are slightly smaller. Selection of this substitute requires confirmation that application current demands do not exceed 3.4 A and that increased DC resistance is acceptable for thermal management.

Frequently Asked Questions (FAQ)

Q: Can SDR1005-6R8ML directly replace SMP3316-681M in all applications?

A: No. The SDR1005-6R8ML has a maximum current rating of 3.4 A compared to the SMP3316-681M's 5 A rating. Direct substitution is only valid for applications where peak current demand does not exceed 3.4 A.

Q: What is the impact of higher DC resistance in the SDR1005-6R8ML?

A: The SDR1005-6R8ML has 30 mOhm maximum DC resistance versus 20.2 mOhm for the SMP3316-681M. At 3.4 A, this results in approximately 3.47 mW additional power dissipation compared to the main part at the same current level. Applications sensitive to thermal performance must account for this difference.

Q: Are there physical compatibility concerns between these parts?

A: Both parts are surface mount with nonstandard packages. The SDR1005-6R8ML is physically smaller (0.500" L x 0.394" W x 0.197" H) compared to the SMP3316-681M (0.530" L x 0.420" W x 0.236" H). PCB layout and thermal management considerations may differ.

Q: What is the operating temperature difference?

A: The SMP3316-681M operates from -55°C to 125°C, while the SDR1005-6R8ML operates from -40°C to 125°C. Applications requiring operation below -40°C must use the primary part.

Q: How do the inductance specifications compare?

A: Both parts provide 6.8 µH inductance with ±20% tolerance at their respective test frequencies (100 kHz for SMP3316-681M, 1 kHz for SDR1005-6R8ML). Inductance values are equivalent for standard circuit applications.

Q: What compliance certifications apply to each part?

A: The SMP3316-681M lists RoHS status as not applicable. The SDR1005-6R8ML is ROHS3 compliant. Both parts are REACH unaffected and classified as EAR99 for export control purposes.