SST04K-800SW TRIAC Equivalent & Substitute Parts

Part Overview

The SST04K-800SW is a standard TRIAC rated for 800V off-state voltage and 4A on-state current, manufactured by SMC Diode Solutions in a surface mount DPAK package. This component is actively produced and widely used in AC switching applications requiring reliable gate triggering characteristics. Substitute parts are identified when equivalent electrical ratings, mechanical compatibility, and compliance certifications align with the original specification, enabling seamless integration into existing designs or addressing supply chain requirements.

Substiute Parts

SST04K-800SW

SMC Diode SolutionsIn Stock: 3370SST04K-800SW Datasheet

Current PartRFQ

MAC4DSNT4G

Littelfuse Inc.In Stock: 19696MAC4DSNT4G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SST04K-800SW is determined by strict alignment of the following critical parameters:

• Voltage - Off State: 800 V (exact match required)
• Current - On State (It (RMS)) (Max): 4 A (exact match required)
• Package / Case: TO-252-3, DPAK (2 Leads + Tab), SC-63 (mechanical compatibility required)
• Mounting Type: Surface Mount (assembly process compatibility)
• Operating Temperature Range: -40°C ~ 125°C (thermal envelope compatibility)
• Gate Trigger Parameters (Vgt, Igt, Ih): Must remain within or below specified maximums to ensure circuit compatibility

The MAC4DSNT4G qualifies as a substitute because it meets all critical electrical ratings and mechanical requirements. The primary distinction is the TRIAC type classification: the SST04K-800SW is a Standard TRIAC, while the MAC4DSNT4G is a Logic - Sensitive Gate TRIAC. This difference reflects gate sensitivity characteristics but does not preclude substitution when circuit design accommodates the lower gate trigger voltage (1.3 V vs. 1.5 V maximum).

Parameter Comparison

Engineering Selection Recommendations

Both the SST04K-800SW and MAC4DSNT4G are active production components with ROHS3 compliance and identical moisture sensitivity ratings. The SST04K-800SW maintains standard TRIAC gate characteristics, while the MAC4DSNT4G offers logic-level sensitive gate operation with a lower maximum gate trigger voltage. Selection between these parts depends on circuit gate drive requirements: applications designed for standard gate triggering thresholds should use the SST04K-800SW, while circuits capable of operating with lower gate trigger voltages may use the MAC4DSNT4G. Both parts are suitable for -40°C to 125°C operating environments and meet regulatory compliance requirements for their respective manufacturers.

Frequently Asked Questions (FAQ)

Q: Can the MAC4DSNT4G directly replace the SST04K-800SW in an existing circuit?

A: Direct replacement is possible if the circuit design accommodates the MAC4DSNT4G's lower maximum gate trigger voltage (1.3 V vs. 1.5 V). The identical on-state current rating, off-state voltage, and DPAK package ensure mechanical and electrical compatibility. Circuits designed with gate drive margins above 1.3 V will function without modification.

Q: What is the difference between Standard TRIAC and Logic - Sensitive Gate TRIAC types?

A: The SST04K-800SW is classified as a Standard TRIAC with a maximum gate trigger voltage of 1.5 V. The MAC4DSNT4G is a Logic - Sensitive Gate TRIAC with a maximum gate trigger voltage of 1.3 V. Sensitive gate TRIACs require lower gate current to trigger, making them suitable for logic-level gate drive circuits.

Q: Are both parts available in the same package?

A: Yes. Both the SST04K-800SW and MAC4DSNT4G use the TO-252-3 DPAK package with identical pinout and mechanical dimensions, enabling direct PCB footprint compatibility.

Q: Do both parts meet the same compliance standards?

A: Both parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings. The SST04K-800SW is REACH Affected, while the MAC4DSNT4G is REACH Unaffected. Verify REACH compliance requirements for your specific application and end-use region.

Q: What is the difference in surge current ratings between these parts?

A: The SST04K-800SW specifies 40A non-repetitive surge at 50Hz, while the MAC4DSNT4G specifies 40A at 60Hz. Both parts maintain identical surge current magnitude; the frequency specification reflects regional power system standards.