S8008R SCR 800V 8A TO-220 Equivalent & Substitute Parts

Part Overview

The S8008R is a Silicon Controlled Rectifier (SCR) manufactured by Littelfuse Inc., rated for 800V off-state voltage and 8A RMS on-state current in a TO-220-3 package configuration. This part is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design requirements and procurement needs. The S8008R operates across the industrial temperature range of -40°C to 125°C and complies with RoHS3 standards.

Substiute Parts

S8008R

Littelfuse Inc.In Stock: 930S8008R Datasheet

Current PartRFQ

MCR8NG

Littelfuse Inc.In Stock: 15637MCR8NG Datasheet

MFR RecommendedRFQ

TYN812RG

STMicroelectronicsIn Stock: 26265TYN812RG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the S8008R is determined by the following critical parameters:

• Off-state voltage rating of 800V minimum
• Gate trigger voltage (Vgt) and current (Igt) compatibility within specified maximums
• On-state voltage (Vtm) and current ratings suitable for 8A RMS operation
• Hold current (Ih) and off-state leakage current within acceptable ranges
• Standard Recovery SCR type classification
• TO-220-3 package footprint compatibility
• Operating temperature range of -40°C to 125°C
• RoHS3 compliance

The two substitute parts identified—MCR8NG (Littelfuse Inc.) and TYN812RG (STMicroelectronics)—meet these core electrical and mechanical requirements while offering improved availability and active product status.

Parameter Comparison

Engineering Selection Recommendations

MCR8NG is the primary substitute option, manufactured by Littelfuse Inc. as the same original equipment manufacturer of the S8008R. This part maintains identical off-state voltage, gate trigger current, hold current specifications, and operating temperature range. The MCR8NG features a lower gate trigger voltage maximum (1V versus 1.5V), which represents improved gate sensitivity. The part is in active production status with 15,600 units in stock and carries RoHS3 compliance with REACH Unaffected status.

TYN812RG, manufactured by STMicroelectronics, serves as an alternative substitute with higher current capacity (12A RMS versus 8A RMS) and lower off-state leakage current (5µA versus 10µA). This part is suitable for applications where the additional current margin provides design flexibility. TYN812RG is in active production with 26,200 units in stock and maintains RoHS3 compliance with REACH Unaffected status.

Both substitute parts are available in TO-220-3 package configuration, ensuring mechanical compatibility with existing PCB layouts and thermal management designs.

Frequently Asked Questions (FAQ)

Q: Can MCR8NG directly replace S8008R in existing designs?

A: MCR8NG is electrically compatible with S8008R across all critical parameters. Both parts share identical 800V off-state voltage, 8A RMS current rating, 30mA hold current, and -40°C to 125°C operating temperature range. The TO-220-3 package footprint is identical. The lower gate trigger voltage (1V max versus 1.5V max) on MCR8NG represents improved gate sensitivity and does not create compatibility issues.

Q: What is the difference between MCR8NG and TYN812RG?

A: MCR8NG is manufactured by Littelfuse Inc. and maintains the exact 8A RMS current rating of the original S8008R. TYN812RG is manufactured by STMicroelectronics and provides higher current capacity at 12A RMS, along with lower off-state leakage current (5µA versus 10µA). Both parts meet the 800V voltage requirement and Standard Recovery SCR classification. Selection depends on whether the additional current margin in TYN812RG provides value for the specific application.

Q: Are package dimensions identical across all three parts?

A: All three parts—S8008R, MCR8NG, and TYN812RG—use the TO-220-3 package configuration. Physical footprint and pin spacing are compatible for direct PCB substitution.

Q: Do all substitute parts meet RoHS3 compliance?

A: Both MCR8NG and TYN812RG are RoHS3 compliant, matching the compliance status of the original S8008R. MCR8NG additionally carries REACH Unaffected status, and TYN812RG also carries REACH Unaffected status.

Q: What is the availability status of substitute parts?

A: MCR8NG is in active production with 15,600 units in stock. TYN812RG is in active production with 26,200 units in stock. Both parts offer significantly better availability compared to the discontinued S8008R.