SST08B-800B TRIAC Equivalent & Substitute Parts

Part Overview

The SST08B-800B is a standard TRIAC manufactured by SMC Diode Solutions, rated for 800V off-state voltage and 8A on-state current in a Through Hole TO-220B package. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system support, maintenance, and new design implementations where legacy component replacement is required.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	800	V
Current - On State (It (RMS)) (Max)	8	A
Voltage - Gate Trigger (Vgt) (Max)	1.5	V
Current - Gate Trigger (Igt) (Max)	25	mA
Current - Hold (Ih) (Max)	40	mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	80	A @ 50Hz
Operating Temperature Range	-40 to 125	°C (TJ)
Package / Case	TO-220-3	-
Mounting Type	Through Hole	-
Configuration	Single	-

Substitute Part Grouping Explanation

Substitution of the obsolete SST08B-800B is determined by strict equivalence across the following critical parameters:

Voltage Rating (Off State): 800V minimum
Current Rating (On State RMS): 8A minimum
Gate Trigger Voltage (Vgt): 1.5V maximum
Gate Trigger Current (Igt): 25mA maximum
Hold Current (Ih): 40mA maximum
Surge Current (Itsm): 80A @ 50Hz minimum
Operating Temperature Range: -40°C to 125°C (TJ)
Package Type: TO-220-3 Through Hole configuration
Triac Type: Standard configuration, Single device

The SST08C-800B qualifies as a direct substitute based on shared base product number (SST08), identical electrical specifications, and compatible TO-220B packaging. The primary distinction is product status: SST08C-800B is Active, providing ongoing availability and supply chain continuity.

Parameter Comparison

Parameter	SST08B-800B (Main Part)	SST08C-800B (Substitute)	Match Status
Manufacturer	SMC Diode Solutions	SMC Diode Solutions	Identical
Category	Thyristors	Thyristors	Identical
Triac Type	Standard	Standard	Identical
Voltage - Off State	800 V	800 V	Identical
Current - On State (It (RMS)) (Max)	8 A	8 A	Identical
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	1.5 V	Identical
Current - Gate Trigger (Igt) (Max)	25 mA	25 mA	Identical
Current - Hold (Ih) (Max)	40 mA	40 mA	Identical
Current - Non Rep. Surge 50, 60Hz (Itsm)	80 A @ 50Hz	80 A @ 50Hz	Identical
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	Identical
Configuration	Single	Single	Identical
Package / Case	TO-220-3	TO-220-3	Identical
Mounting Type	Through Hole	Through Hole	Identical
Product Status	Obsolete	Active	Different
Base Product Number	SST08	SST08	Identical
ECCN	EAR99	EAR99	Identical
HTSUS	8541.30.0080	8541.30.0080	Identical

Engineering Selection Recommendations

The SST08C-800B is the manufacturer-recommended substitute for the obsolete SST08B-800B. Both components share identical electrical and mechanical specifications, including voltage rating, current capacity, gate trigger parameters, and thermal operating range. The SST08C-800B maintains Active product status, ensuring continued availability from SMC Diode Solutions and compliance with current supply chain requirements.

Both parts carry identical export control classification (ECCN: EAR99) and harmonized tariff codes (HTSUS: 8541.30.0080), confirming regulatory equivalence for procurement and documentation purposes.

For applications currently using the SST08B-800B, direct substitution with the SST08C-800B requires no circuit modifications, thermal management adjustments, or gate drive circuit redesign. The TO-220-3 Through Hole package remains unchanged, permitting direct board-level replacement without PCB layout alterations.

Frequently Asked Questions (FAQ)

Q: Can the SST08C-800B be used as a direct replacement for SST08B-800B in existing designs?

A: Yes. The SST08C-800B is electrically and mechanically identical to the SST08B-800B across all specified parameters. No circuit modifications are required. The TO-220-3 package dimensions and pin configuration are unchanged.

Q: What is the primary reason for substitution?

A: The SST08B-800B is classified as obsolete. The SST08C-800B is the active equivalent from the same manufacturer, providing ongoing supply chain availability and support.

Q: Are the gate trigger specifications identical between both parts?

A: Yes. Both components specify maximum gate trigger voltage (Vgt) of 1.5V and maximum gate trigger current (Igt) of 25mA. Gate drive circuits require no adjustment.

Q: Do both parts operate within the same temperature range?

A: Yes. Both the SST08B-800B and SST08C-800B operate from -40°C to 125°C junction temperature (TJ). Thermal management requirements remain unchanged.

Q: Is the TO-220-3 package identical for both parts?

A: Yes. Both components use the TO-220-3 Through Hole package. PCB footprints, mounting hardware, and thermal interface requirements are identical.

Q: Are there any compliance or export control differences?

A: No. Both parts carry identical ECCN (EAR99) and HTSUS (8541.30.0080) classifications. Procurement and export documentation requirements are unchanged.

Q: What is the current rating for both parts?

A: Both components are rated for 8A on-state RMS current (It (RMS) Max) with an 80A non-repetitive surge current (Itsm) at 50Hz.

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