S6006VS3 Equivalent & Substitute Parts

Part Overview

The S6006VS3 is a 600V, 6A sensitive gate SCR (silicon controlled rectifier) manufactured by Littelfuse in a through-hole TO-251 package. This component is discontinued at DiGi Electronics but remains available in inventory (1018 pcs). Due to its discontinued status, equivalent substitute parts from active product lines are necessary for new designs and ongoing production requirements. Substitute parts must maintain the 600V off-state voltage rating and sensitive gate characteristics while accommodating variations in current ratings and mounting technologies.

Key Parameters

Parameter	S6006VS3
Voltage - Off State	600 V
Voltage - Gate Trigger (Vgt) (Max)	800 mV
Current - Gate Trigger (Igt) (Max)	500 µA
Voltage - On State (Vtm) (Max)	1.6 V
Current - On State (It (RMS)) (Max)	6 A
Current - Hold (Ih) (Max)	8 mA
SCR Type	Sensitive Gate
Operating Temperature	-40°C ~ 110°C
Mounting Type	Through Hole
Package / Case	TO-251-3 Short Leads, IPak
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution logic for the S6006VS3 is based on the following critical parameters:

Primary Matching Criteria:

Voltage - Off State: 600 V (mandatory)
SCR Type: Sensitive Gate (mandatory for gate trigger characteristics)
Voltage - Gate Trigger (Vgt) (Max): 800 mV (defines gate sensitivity)
Voltage - On State (Vtm) (Max): 1.6 V (on-state performance)

Secondary Matching Criteria:

Current - On State (It (RMS)): Rated equal to or greater than 6 A
Current - Hold (Ih) (Max): Must not exceed application requirements
Operating Temperature Range: -40°C minimum, 110°C minimum
Mounting Type: Through Hole preferred for direct replacement; Surface Mount (MCR708A1G) acceptable for redesign scenarios
Package Compatibility: TO-251 (IPAK/I-PAK) for through-hole applications

Substitute parts are grouped into two categories:

Category 1: Direct Through-Hole Replacements (Same Package)

TS1220-600H, TS420-600H, TS820-600H: All maintain TO-251 through-hole mounting, sensitive gate type, and 600V rating with matching on-state voltage characteristics.

Category 2: Surface Mount Alternative (Redesign Required)

MCR708A1G: Provides 600V sensitive gate functionality but requires PCB redesign due to TO-252 (DPAK) surface mount package. Current rating is lower (4A RMS) and suitable only for lower-current applications.

Parameter Comparison

Parameter	S6006VS3	TS1220-600H	TS420-600H	TS820-600H	MCR708A1G
Voltage - Off State	600 V	600 V	600 V	600 V	600 V
Voltage - Gate Trigger (Vgt) (Max)	800 mV	800 mV	800 mV	800 mV	800 mV
Current - Gate Trigger (Igt) (Max)	500 µA	200 µA	200 µA	200 µA	75 µA
Voltage - On State (Vtm) (Max)	1.6 V	1.6 V	1.6 V	1.6 V	2.2 V
Current - On State (It (RMS)) (Max)	6 A	12 A	4 A	8 A	4 A
Current - Hold (Ih) (Max)	8 mA	40 mA	5 mA	5 mA	5 mA
SCR Type	Sensitive Gate	Standard Recovery	Sensitive Gate	Sensitive Gate	Sensitive Gate
Operating Temperature	-40°C ~ 110°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 110°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Surface Mount
Package / Case	TO-251-3 Short Leads, IPak	TO-251-3 Short Leads, IPak	TO-251-3 Short Leads, IPak	TO-251-3 Short Leads, IPak	TO-252-3, DPAK
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued	Active	Active	Active	Active

Engineering Selection Recommendations

For Direct Through-Hole Replacement (No PCB Redesign):

TS820-600H is the primary substitute for the S6006VS3. It maintains identical package geometry (TO-251 IPAK), matching on-state voltage (1.6V max), and sensitive gate characteristics (800 mV Vgt, 200 µA Igt). The 8A RMS current rating exceeds the original 6A specification, providing margin for thermal and transient conditions. Operating temperature range extends to 125°C. All compliance certifications (ROHS3) are maintained. This part is actively manufactured by STMicroelectronics with 2100 pcs in stock.

TS420-600H serves as a substitute for current-limited applications requiring 4A RMS or less. It maintains identical electrical characteristics to TS820-600H but with lower current capacity. Use this part only when application current requirements do not exceed 4A RMS.

TS1220-600H provides the highest current capacity (12A RMS) but uses Standard Recovery SCR type rather than Sensitive Gate. This part is suitable only if gate trigger characteristics are not critical to circuit operation. Current - Hold (Ih) is elevated to 40 mA compared to 5 mA in sensitive gate alternatives.

For Surface Mount Redesign:

MCR708A1G is the only surface mount option, requiring PCB redesign due to TO-252 (DPAK) package. This part is suitable for new designs or redesigns where surface mount technology is preferred. The 4A RMS current rating limits application to lower-current circuits. On-state voltage is elevated to 2.2V maximum. Gate trigger current is reduced to 75 µA, indicating enhanced gate sensitivity. This part is actively manufactured by Littelfuse with 8425 pcs in stock.

Compliance and Availability:

All substitute parts maintain ROHS3 compliance and are actively manufactured. TS1220-600H has the highest inventory (41300 pcs), followed by MCR708A1G (8425 pcs), TS820-600H (2100 pcs), and TS420-600H (1898 pcs).

Frequently Asked Questions (FAQ)

Q: Can TS820-600H directly replace S6006VS3 without circuit modification?

A: Yes. TS820-600H maintains identical package (TO-251 IPAK), voltage ratings (600V off-state, 1.6V on-state max), and gate characteristics (800 mV Vgt, sensitive gate type). The higher current rating (8A vs 6A) does not require circuit changes and provides additional thermal margin.

Q: Why is TS1220-600H listed as a substitute if it uses Standard Recovery instead of Sensitive Gate?

A: TS1220-600H is included because it meets the 600V voltage requirement and maintains the same package. However, Standard Recovery type has different gate trigger characteristics (1.3V Vgt, 15 mA Igt) and higher hold current (40 mA). Use this part only if your circuit does not depend on sensitive gate triggering behavior.

Q: Is MCR708A1G suitable as a drop-in replacement?

A: No. MCR708A1G requires PCB redesign because it uses TO-252 (DPAK) surface mount package instead of through-hole TO-251. Additionally, the 4A RMS current rating is lower than the original 6A specification. This part is suitable only for new designs or complete board redesigns where surface mount technology is implemented.

Q: What is the difference between Sensitive Gate and Standard Recovery SCR types?

A: Sensitive Gate SCRs have lower gate trigger voltage (Vgt) and current (Igt) requirements, enabling triggering with minimal gate drive circuitry. Standard Recovery SCRs require higher gate drive but may offer faster turn-off characteristics. For the S6006VS3 application, Sensitive Gate type is preferred unless circuit design specifically requires Standard Recovery performance.

Q: Can I use TS420-600H if my application requires 6A?

A: No. TS420-600H is rated for 4A RMS maximum. Using it in a 6A application exceeds its current rating and will cause thermal stress and potential failure. Use TS820-600H or TS1220-600H for 6A or higher current requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed (TS1220-600H, TS420-600H, TS820-600H, MCR708A1G) are ROHS3 compliant, matching the original S6006VS3 compliance status.

Q: What is the operating temperature difference between S6006VS3 and its substitutes?

A: S6006VS3 operates from -40°C to 110°C. TS1220-600H, TS420-600H, and TS820-600H extend the upper limit to 125°C, providing additional thermal margin. MCR708A1G maintains the same -40°C to 110°C range as the original part.

Q: Which substitute has the best gate sensitivity?

A: MCR708A1G has the lowest gate trigger current (Igt) at 75 µA maximum, indicating the highest gate sensitivity. TS1220-600H, TS420-600H, and TS820-600H all have 200 µA Igt. The original S6006VS3 has 500 µA Igt. Lower Igt values allow triggering with minimal gate drive power.

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