S6004VS1 Equivalent & Substitute Parts

Part Overview

The S6004VS1 is a 600V 4A Sensitive Gate SCR (Silicon Controlled Rectifier) in TO-251 through-hole packaging manufactured by Littelfuse Inc. This thyristor is designed for applications requiring controlled rectification and switching at moderate current levels with sensitive gate triggering characteristics. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility for existing designs.

Key Parameters

Parameter	S6004VS1 Value
Voltage - Off State	600 V
Voltage - Gate Trigger (Vgt) (Max)	800 mV
Current - Gate Trigger (Igt) (Max)	50 µA
Voltage - On State (Vtm) (Max)	1.6 V
Current - On State (It (RMS)) (Max)	4 A
Current - Hold (Ih) (Max)	4 mA
SCR Type	Sensitive Gate
Operating Temperature	-40°C ~ 110°C
Mounting Type	Through Hole
Package / Case	TO-251-3 Short Leads, IPak, TO-251AA
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the S6004VS1 is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain 600V off-state voltage to ensure equivalent blocking capability in the application circuit.

SCR Type: The S6004VS1 is a Sensitive Gate device. Direct substitutes must also be Sensitive Gate SCRs to maintain the same gate triggering characteristics (lower gate trigger voltage and current requirements).

Mounting Type & Package: The original part uses through-hole TO-251 packaging. Substitutes are grouped into two categories: (1) direct through-hole TO-251 equivalents maintaining identical PCB footprint compatibility, and (2) surface-mount alternatives requiring PCB redesign.

Current Rating: While the S6004VS1 is rated for 4A RMS, substitute parts with higher current ratings (8A, 12A) are acceptable as they provide design margin and are backward-compatible for lower-current applications.

Gate Trigger Parameters: Sensitive Gate SCRs with Vgt ≤ 800 mV and Igt ≤ 50 µA are direct equivalents. Parts with higher gate trigger specifications may require circuit redesign.

Parameter Comparison

Parameter	S6004VS1	S6004VS1TP	TS1220-600H	TS820-600H	TN1215-600H	MCR708A1G
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	STMicroelectronics	STMicroelectronics	STMicroelectronics	Littelfuse Inc.
Voltage - Off State	600 V	600 V	600 V	600 V	600 V	600 V
Voltage - Gate Trigger (Vgt) (Max)	800 mV	800 mV	800 mV	800 mV	1.3 V	800 mV
Current - Gate Trigger (Igt) (Max)	50 µA	50 µA	200 µA	200 µA	15 mA	75 µA
Voltage - On State (Vtm) (Max)	1.6 V	1.6 V	1.6 V	1.6 V	1.6 V	2.2 V
Current - On State (It (RMS)) (Max)	4 A	4 A	12 A	8 A	12 A	4 A
Current - Hold (Ih) (Max)	4 mA	4 mA	5 mA	5 mA	40 mA	5 mA
SCR Type	Sensitive Gate	Sensitive Gate	Sensitive Gate	Sensitive Gate	Standard Recovery	Sensitive Gate
Operating Temperature	-40°C ~ 110°C	-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	Through Hole	Surface Mount
Package / Case	TO-251-3 Short Leads, IPak, TO-251AA	TO-251-3 Short Leads, IPak, TO-251AA	TO-251-3 Short Leads, IPak, TO-251AA	TO-251-3 Short Leads, IPak, TO-251AA	TO-251-3 Short Leads, IPak, TO-251AA	TO-252-3, DPAK (2 Leads + Tab), SC-63
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued at DiGi Electronics	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Pin-Compatible Replacement (No PCB Modification Required)

S6004VS1TP is the primary direct replacement. It is manufactured by Littelfuse Inc. and maintains identical electrical specifications and TO-251 through-hole packaging. The part is currently active in production with 5105 units in stock. This substitute requires no circuit or PCB changes.

Through-Hole Alternatives with Higher Current Ratings

TS1220-600H and TS820-600H are STMicroelectronics Sensitive Gate SCRs in TO-251 through-hole packaging. Both maintain 600V blocking voltage and 800 mV gate trigger voltage. TS1220-600H provides 12A RMS current capability, while TS820-600H provides 8A RMS. Both are rated for -40°C to 125°C operating temperature, extending the thermal range beyond the original S6004VS1. These parts are suitable for applications where higher current margin is beneficial.

Standard Recovery Alternative

TN1215-600H is an STMicroelectronics Standard Recovery SCR with 12A RMS current rating in TO-251 through-hole packaging. This part differs from the S6004VS1 in SCR type (Standard Recovery vs. Sensitive Gate) and exhibits higher gate trigger specifications (Vgt 1.3V, Igt 15mA). This substitute is applicable only when the application circuit can accommodate the different gate triggering characteristics and recovery behavior.

Surface-Mount Alternative (PCB Redesign Required)

MCR708A1G is a Littelfuse Inc. Sensitive Gate SCR in TO-252 surface-mount DPAK packaging. It maintains 600V blocking voltage and 800 mV gate trigger voltage with 4A RMS current rating. This substitute requires PCB layout modification to accommodate the different package footprint and is suitable for new designs or boards undergoing revision.

All substitute parts are ROHS3 compliant and carry EAR99 export classification matching the original part.

Frequently Asked Questions (FAQ)

Q: Can S6004VS1TP be used as a direct replacement for S6004VS1?

A: Yes. S6004VS1TP is manufactured by Littelfuse Inc. and provides identical electrical specifications and TO-251 through-hole packaging. No circuit or PCB modifications are required. The only difference is packaging format (tube vs. the original part's packaging).

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

A: Sensitive Gate SCRs require lower gate trigger voltage and current to initiate conduction, making them suitable for low-power gate drive circuits. Standard Recovery SCRs require higher gate trigger specifications but may offer different recovery characteristics. TN1215-600H is a Standard Recovery device and should only be substituted if the application circuit is designed to accommodate its higher gate trigger requirements.

Q: Can I use TS1220-600H or TS820-600H instead of S6004VS1?

A: Yes, both are suitable substitutes for through-hole applications. TS1220-600H provides 12A RMS current and TS820-600H provides 8A RMS current, both exceeding the original 4A rating. Both maintain 600V blocking voltage, 800 mV gate trigger voltage, and TO-251 through-hole packaging. The higher current ratings provide design margin for existing applications.

Q: Is MCR708A1G compatible with the original S6004VS1 PCB?

A: No. MCR708A1G uses TO-252 surface-mount DPAK packaging, while S6004VS1 uses through-hole TO-251 packaging. PCB layout modification is required. This substitute is suitable for new designs or boards undergoing revision.

Q: What is the operating temperature range difference?

A: S6004VS1 operates from -40°C to 110°C. STMicroelectronics substitutes (TS1220-600H, TS820-600H, TN1215-600H) extend the upper limit to 125°C, providing additional thermal margin in high-temperature environments.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, matching the environmental compliance status of the original S6004VS1.

Q: Which substitute should I choose for a new design?

A: For new through-hole designs requiring 4A capability, S6004VS1TP or MCR708A1G (if surface-mount is acceptable) are recommended. For designs requiring higher current margin, TS820-600H (8A) or TS1220-600H (12A) are suitable. For surface-mount designs, MCR708A1G is the appropriate choice.

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