S6008R SCR 600V 8A TO-220 Equivalent & Substitute Parts

Part Overview

The S6008R is a standard recovery silicon controlled rectifier (SCR) manufactured by Littelfuse Inc., rated for 600V off-state voltage and 8A RMS on-state current in a TO-220-3 through-hole package. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	S6008R Value
Voltage - Off State	600 V
Voltage - Gate Trigger (Vgt) (Max)	1.5 V
Current - Gate Trigger (Igt) (Max)	15 mA
Voltage - On State (Vtm) (Max)	1.6 V
Current - On State (It (RMS)) (Max)	8 A
Current - Hold (Ih) (Max)	30 mA
Current - Off State (Max)	10 µA
SCR Type	Standard Recovery
Operating Temperature Range	-40°C to 125°C
Package / Case	TO-220-3
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the S6008R is determined by the following critical parameters:

Voltage Rating: Off-state voltage must be 600V or higher
Current Rating: On-state RMS current must be 8A or higher to maintain or exceed the original specification
Gate Trigger Characteristics: Vgt and Igt must be compatible with existing gate drive circuitry
On-State Voltage Drop: Vtm should be comparable to minimize thermal and efficiency changes
SCR Type: Standard recovery SCR type preferred for direct replacement; sensitive gate variants acceptable if gate drive is compatible
Package: TO-220-3 through-hole package required for mechanical compatibility
Temperature Range: Operating range must cover -40°C to 125°C minimum

Substitute parts are grouped into two categories: direct replacements (same current rating and SCR type) and upgraded alternatives (higher current ratings with compatible electrical characteristics).

Parameter Comparison

Parameter	S6008R	MCR12MG	MCR72-8G	TYN606RG	TYN608RG	TYN610RG	TYN612RG
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Voltage - Off State	600 V	600 V	600 V	600 V	600 V	600 V	600 V
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	1 V	1.5 V	1.5 V	1.3 V	1.5 V	1.3 V
Current - Gate Trigger (Igt) (Max)	15 mA	20 mA	200 µA	15 mA	15 mA	15 mA	15 mA
Voltage - On State (Vtm) (Max)	1.6 V	2.2 V	2 V	1.6 V	1.6 V	1.6 V	1.6 V
Current - On State (It (RMS)) (Max)	8 A	12 A	8 A	6 A	8 A	10 A	12 A
Current - Hold (Ih) (Max)	30 mA	40 mA	6 mA	30 mA	30 mA	30 mA	30 mA
Current - Off State (Max)	10 µA	10 µA	10 µA	10 µA	5 µA	10 µA	5 µA
SCR Type	Standard Recovery	Standard Recovery	Sensitive Gate	Standard Recovery	Standard Recovery	Standard Recovery	Standard Recovery
Operating Temperature Range	-40°C to 125°C	-40°C to 125°C	-40°C to 110°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Current Rating Match (8A RMS):

MCR72-8G and TYN608RG both provide 8A RMS on-state current matching the S6008R specification. MCR72-8G is a sensitive gate variant with significantly lower gate trigger current (200 µA vs. 15 mA), suitable for applications with reduced gate drive capability. TYN608RG maintains standard gate characteristics with marginally lower gate trigger voltage (1.3V vs. 1.5V) and improved off-state leakage (5 µA vs. 10 µA). Both are active products with full temperature range support.

Upgraded Current Ratings:

MCR12MG, TYN610RG, and TYN612RG provide higher on-state current ratings (12A, 10A, and 12A respectively) while maintaining 600V voltage rating and TO-220-3 package compatibility. These are suitable for applications requiring additional current margin or where higher current capacity is beneficial. MCR12MG exhibits higher on-state voltage drop (2.2V vs. 1.6V) and increased gate trigger current (20 mA vs. 15 mA). TYN610RG and TYN612RG maintain on-state voltage characteristics comparable to the original part.

Lower Current Rating:

TYN606RG provides 6A RMS on-state current, below the S6008R specification. This part is suitable only for applications where the original 8A rating exceeds actual circuit requirements.

All substitute parts are ROHS3 compliant and support the full -40°C to 125°C operating temperature range, with the exception of MCR72-8G which is rated to 110°C maximum.

Frequently Asked Questions (FAQ)

Q: Can MCR72-8G replace S6008R directly in all applications?

A: MCR72-8G is electrically compatible as a direct current rating match (8A RMS), but it is a sensitive gate SCR type with gate trigger current of 200 µA compared to the S6008R standard gate specification of 15 mA. Applications with existing gate drive circuits designed for standard gate SCRs may require gate drive circuit modification. The maximum operating temperature is also reduced to 110°C.

Q: What is the difference between standard recovery and sensitive gate SCR types?

A: Standard recovery SCRs require higher gate trigger current (typically 15-20 mA) for reliable triggering. Sensitive gate SCRs require significantly lower gate trigger current (typically 200 µA or less), allowing operation with reduced gate drive power. Selection depends on the gate drive circuit design and available gate current capability.

Q: Are STMicroelectronics TYN series parts fully compatible with Littelfuse S6008R?

A: TYN606RG, TYN608RG, TYN610RG, and TYN612RG are mechanically and electrically compatible with S6008R in TO-220-3 through-hole applications. All maintain 600V voltage rating, standard recovery SCR type, and comparable gate trigger characteristics. Current ratings vary from 6A to 12A RMS. Verify on-state voltage drop and gate trigger specifications against application requirements.

Q: Can I use a higher current rated part as a substitute?

A: Yes. MCR12MG, TYN610RG, and TYN612RG provide higher current ratings (10A to 12A RMS) while maintaining 600V voltage rating and TO-220-3 package compatibility. Higher current rating provides additional thermal margin and is suitable for applications where the original 8A specification is marginal. Verify on-state voltage drop (Vtm) and gate trigger current (Igt) compatibility with existing circuit design.

Q: Why is TYN606RG listed if it provides only 6A current?

A: TYN606RG is included for applications where the original 8A rating exceeds actual circuit requirements. It provides a lower current alternative with identical voltage rating, package, and standard recovery SCR type. Use only if circuit analysis confirms 6A RMS current is sufficient.

Q: What is the impact of different on-state voltage drops (Vtm)?

A: On-state voltage drop directly affects power dissipation and thermal performance. S6008R specifies 1.6V maximum. MCR12MG specifies 2.2V maximum, resulting in approximately 37.5% higher power dissipation at rated current. TYN series parts maintain 1.6V specification. Higher Vtm increases heat generation and may require thermal design review in power-limited applications.

Q: Are all substitute parts currently in stock?

A: MCR12MG, MCR72-8G, TYN606RG, TYN608RG, TYN610RG, and TYN612RG are all active products with inventory available. S6008R is discontinued at DiGi Electronics. Verify current availability with your component supplier before design finalization.

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