S6006VS3TP Equivalent & Substitute Parts

Part Overview

The S6006VS3TP is a 600V, 6A sensitive gate SCR (silicon controlled rectifier) manufactured by Littelfuse Inc. in a through-hole TO-251 package. This thyristor is designed for AC and DC switching applications requiring controlled gate triggering. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating. Substitute parts may be required due to inventory constraints, application-specific current requirements, or package preference changes while maintaining electrical compatibility within the 600V off-state voltage class.

Key Parameters

Parameter	S6006VS3TP
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 Range	-40°C to 110°C
Mounting Type	Through Hole
Package / Case	TO-251-3 (V-Pak/I-Pak)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the S6006VS3TP is determined by the following criteria:

Primary Compatibility Requirements:

Off-state voltage rating: 600V (exact match required)
SCR type: Sensitive Gate (gate trigger characteristics must be compatible)
Mounting type: Through Hole (mechanical fit requirement)
Package: TO-251 family (pin configuration compatibility)
On-state voltage (Vtm): Maximum 1.6V (thermal performance equivalence)

Current Rating Considerations:

RMS current rating may vary (4A to 12A) depending on application thermal design
Gate trigger current (Igt) and voltage (Vgt) must support the control circuit design
Hold current (Ih) affects minimum load current requirements

Compliance Requirements:

RoHS3 compliance maintained across all substitutes
Operating temperature range may extend to 125°C for some alternatives
MSL rating: 1 (Unlimited) for all qualified substitutes

Parameter Comparison

Parameter	S6006VS3TP	MCR708A1G	TN1215-600H	TS1220-600H	TS820-600H
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	STMicroelectronics	STMicroelectronics	STMicroelectronics
Voltage - Off State	600 V	600 V	600 V	600 V	600 V
Voltage - Gate Trigger (Vgt) Max	800 mV	800 mV	1.3 V	800 mV	800 mV
Current - Gate Trigger (Igt) Max	500 µA	75 µA	15 mA	200 µA	200 µA
Voltage - On State (Vtm) Max	1.6 V	2.2 V	1.6 V	1.6 V	1.6 V
Current - On State (It RMS) Max	6 A	4 A	12 A	12 A	8 A
Current - Hold (Ih) Max	8 mA	5 mA	40 mA	5 mA	5 mA
SCR Type	Sensitive Gate	Sensitive Gate	Standard Recovery	Sensitive Gate	Sensitive Gate
Operating Temperature Range	-40°C to 110°C	-40°C to 110°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Mounting Type	Through Hole	Surface Mount	Through Hole	Through Hole	Through Hole
Package / Case	TO-251-3	TO-252-3 (DPAK)	TO-251-3	TO-251-3	TO-251-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Through-Hole Substitutes (Same Package Family):

TS1220-600H and TS820-600H are direct mechanical and electrical substitutes for through-hole applications. Both maintain the TO-251-3 package configuration, 600V off-state voltage, and sensitive gate characteristics. TS1220-600H provides higher current capacity (12A RMS) suitable for applications requiring increased thermal margin. TS820-600H offers 8A RMS current rating as an intermediate option. Both parts extend operating temperature to 125°C and maintain gate trigger specifications compatible with existing control circuits.

Current-Limited Substitute (Through-Hole):

TN1215-600H is a through-hole TO-251-3 substitute with 12A RMS capacity but operates as a standard recovery SCR rather than sensitive gate. This part requires higher gate trigger current (15 mA maximum) and voltage (1.3V maximum), necessitating control circuit redesign. Selection is appropriate only when higher current capacity is required and gate drive circuitry can be modified.

Surface Mount Alternative (Package Change):

MCR708A1G is a surface mount TO-252 (DPAK) substitute with 4A RMS current rating. This part maintains sensitive gate characteristics and 600V off-state voltage but requires PCB layout modification and surface mount assembly capability. On-state voltage is elevated to 2.2V maximum. Selection is appropriate for new designs or board revisions where surface mount technology is preferred and current requirements do not exceed 4A RMS.

Compliance and Availability:

All substitute parts maintain ROHS3 compliance, unlimited MSL rating, and active production status. Selection should prioritize parts with highest inventory availability for supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can MCR708A1G replace S6006VS3TP in an existing through-hole PCB design?

A: No. MCR708A1G uses TO-252 surface mount packaging, which is mechanically incompatible with through-hole TO-251-3 footprints. PCB redesign and assembly process modification are required. This substitute is suitable only for new designs or board revisions.

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

A: Sensitive gate SCRs (S6006VS3TP, TS1220-600H, TS820-600H) require lower gate trigger current and voltage for activation, enabling simpler control circuits. Standard recovery SCRs (TN1215-600H) require higher gate drive current (15 mA) and voltage (1.3V), necessitating more robust gate drive circuitry. Standard recovery types typically offer faster turn-off characteristics.

Q: Can TS1220-600H be used in applications designed for S6006VS3TP?

A: Yes. TS1220-600H maintains identical TO-251-3 package, 600V off-state voltage, 1.6V on-state voltage, and sensitive gate characteristics. The 12A RMS rating exceeds the 6A requirement, providing thermal margin. Operating temperature extends to 125°C. No circuit modification is required.

Q: What are the implications of using TS820-600H instead of S6006VS3TP?

A: TS820-600H is a direct substitute with identical package, voltage ratings, and gate characteristics. The 8A RMS rating exceeds the 6A requirement. Operating temperature extends to 125°C. No circuit modification is required. Selection is appropriate when intermediate current capacity is preferred.

Q: Why does MCR708A1G have a higher on-state voltage (2.2V) than S6006VS3TP (1.6V)?

A: On-state voltage variation reflects different semiconductor design and manufacturing processes between manufacturers and package types. The 0.6V difference results in increased power dissipation at rated current. Thermal design must account for this elevated voltage drop. MCR708A1G is suitable only for applications where this additional power loss is acceptable.

Q: Is TN1215-600H compatible with the gate drive circuit designed for S6006VS3TP?

A: No. TN1215-600H requires significantly higher gate trigger current (15 mA maximum vs. 500 µA) and voltage (1.3V maximum vs. 800 mV). Existing gate drive circuits designed for sensitive gate operation will not reliably trigger this standard recovery device. Gate drive circuit redesign is mandatory.

Q: Can all substitute parts be used interchangeably in the same application?

A: No. Substitution depends on specific application requirements. Through-hole mounting is required for existing PCB designs, eliminating MCR708A1G. Gate drive circuit compatibility eliminates TN1215-600H unless redesign is performed. Current requirements determine whether 4A (MCR708A1G), 6A (S6006VS3TP), 8A (TS820-600H), or 12A (TS1220-600H, TN1215-600H) rating is appropriate.

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