S6004VS2 Equivalent & Substitute Parts

Part Overview

The S6004VS2 is a 600V 4A sensitive gate SCR (silicon-controlled rectifier) in TO-251 through-hole packaging manufactured by Littelfuse. This component is discontinued at DiGi Electronics but remains available in bulk inventory. Finding equivalent and substitute parts is necessary due to product discontinuation and to support design flexibility across manufacturing environments and supply chain optimization.

Key Parameters

Parameter	S6004VS2
Voltage - Off State	600 V
Voltage - Gate Trigger (Vgt) (Max)	800 mV
Current - Gate Trigger (Igt) (Max)	200 µA
Voltage - On State (Vtm) (Max)	1.6 V
Current - On State (It (RMS)) (Max)	4 A
Current - Hold (Ih) (Max)	6 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 S6004VS2 is determined by the following critical parameters:

Voltage Rating (Off State): Must be 600 V minimum
SCR Type: Sensitive Gate operation required for gate trigger compatibility
Current Rating (It (RMS)): Must support 4 A minimum
Gate Trigger Characteristics: Vgt (Max) 800 mV and Igt (Max) 200 µA define gate sensitivity
On-State Voltage (Vtm): Maximum 1.6 V for thermal performance equivalence
Mounting Type: Through-hole configuration for PCB compatibility
Package Compatibility: TO-251 (IPAK/V-Pak) footprint for direct board-level substitution

Substitute parts are grouped into two categories:

Direct Equivalents (Identical Packaging & Electrical Characteristics): Parts with matching TO-251 through-hole packaging, 600V rating, 4A RMS current, and sensitive gate operation.

Functional Alternatives (Different Packaging or Enhanced Ratings): Parts with compatible electrical performance but different mounting technology (surface mount) or higher current ratings that can serve the same circuit function with design adaptation.

Parameter Comparison

Part Number	Manufacturer	Voltage - Off State	Vgt (Max)	Igt (Max)	Vtm (Max)	It (RMS) (Max)	Ih (Max)	SCR Type	Mounting Type	Package	Product Status
S6004VS2	Littelfuse	600 V	800 mV	200 µA	1.6 V	4 A	6 mA	Sensitive Gate	Through Hole	TO-251	Discontinued
S6004VS2TP	Littelfuse Inc.	600 V	800 mV	200 µA	1.6 V	4 A	6 mA	Sensitive Gate	Through Hole	TO-251	Active
TS420-600H	STMicroelectronics	600 V	800 mV	200 µA	1.6 V	4 A	5 mA	Sensitive Gate	Through Hole	TO-251	Active
TS820-600H	STMicroelectronics	600 V	800 mV	200 µA	1.6 V	8 A	5 mA	Sensitive Gate	Through Hole	TO-251	Active
TS1220-600H	STMicroelectronics	600 V	800 mV	200 µA	1.6 V	12 A	5 mA	Sensitive Gate	Through Hole	TO-251	Active
TN1215-600H	STMicroelectronics	600 V	1.3 V	15 mA	1.6 V	12 A	40 mA	Standard Recovery	Through Hole	TO-251	Active
BT148-600R,127	WeEn Semiconductors	600 V	1.5 V	200 µA	1.8 V	4 A	6 mA	Sensitive Gate	Through Hole	SOT-82	Active
MCR708A1G	Littelfuse Inc.	600 V	800 mV	75 µA	2.2 V	4 A	5 mA	Sensitive Gate	Surface Mount	TO-252 (DPAK)	Active

Engineering Selection Recommendations

For Direct Replacement (No Design Changes Required):

S6004VS2TP is the primary direct equivalent. It is manufactured by Littelfuse, maintains identical electrical specifications and TO-251 through-hole packaging, and carries active product status with higher inventory availability (3834 pcs) compared to the discontinued S6004VS2 (2228 pcs).

TS420-600H (STMicroelectronics) provides an alternative direct replacement with matching 600V, 4A RMS, and sensitive gate characteristics in TO-251 packaging. It is ROHS3 compliant and actively produced with 1898 pcs in stock.

For Current Margin Applications:

TS820-600H and TS1220-600H are higher-current rated alternatives (8A and 12A RMS respectively) in the same TO-251 package with identical gate trigger specifications. These are suitable for designs requiring thermal margin or future current scaling while maintaining the same footprint and gate drive requirements.

For Non-Sensitive Gate Applications:

TN1215-600H (STMicroelectronics) is a standard recovery SCR with 12A RMS rating in TO-251 packaging. This part differs in SCR type (standard recovery vs. sensitive gate) and gate trigger parameters (Vgt 1.3V, Igt 15mA). Selection requires verification that the application does not depend on sensitive gate operation.

For Surface Mount Designs:

MCR708A1G (Littelfuse) provides a surface-mount alternative in TO-252 (DPAK) packaging with 600V, 4A RMS, and sensitive gate operation. Gate trigger current is lower (75 µA vs. 200 µA), and on-state voltage is higher (2.2V vs. 1.6V). This part is suitable only for new designs with surface-mount capability.

For Different Footprint Compatibility:

BT148-600R,127 (WeEn Semiconductors) is a through-hole sensitive gate SCR with 600V, 4A RMS in SOT-82 packaging. Gate trigger voltage is higher (1.5V vs. 800mV), and on-state voltage is higher (1.8V vs. 1.6V). This part requires PCB footprint redesign and is suitable only when SOT-82 packaging is available in the design.

All recommended substitutes are ROHS3 compliant and carry active product status except the original S6004VS2.

Frequently Asked Questions (FAQ)

Q: Can S6004VS2TP be used as a direct drop-in replacement for S6004VS2?

A: Yes. S6004VS2TP is manufactured by Littelfuse with identical electrical specifications (600V, 4A RMS, 800mV gate trigger, 1.6V on-state voltage) and TO-251 through-hole packaging. The only difference is packaging format (tube vs. bulk), which does not affect electrical performance or PCB compatibility.

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

A: Sensitive gate SCRs (S6004VS2, TS420-600H, TS820-600H, TS1220-600H, BT148-600R,127, MCR708A1G) require lower gate trigger current and voltage for turn-on. Standard recovery SCRs (TN1215-600H) require higher gate drive (Igt 15mA vs. 200µA, Vgt 1.3V vs. 800mV) and are designed for different circuit topologies. Substitution between these types requires gate drive circuit verification.

Q: Can TS820-600H or TS1220-600H replace S6004VS2 in a 4A application?

A: Yes, with thermal margin. Both parts maintain 600V voltage rating, sensitive gate operation, and TO-251 packaging. TS820-600H is rated 8A RMS and TS1220-600H is rated 12A RMS, providing current headroom above the 4A requirement. On-state voltage (1.6V) and gate trigger specifications are identical to S6004VS2, ensuring gate drive compatibility.

Q: Why is MCR708A1G not recommended as a direct replacement?

A: MCR708A1G uses surface-mount TO-252 (DPAK) packaging instead of through-hole TO-251. Additionally, gate trigger current is lower (75µA vs. 200µA) and on-state voltage is higher (2.2V vs. 1.6V). This part requires PCB redesign and gate drive circuit verification. It is suitable only for new surface-mount designs.

Q: Is BT148-600R,127 compatible with S6004VS2 circuits?

A: BT148-600R,127 maintains 600V, 4A RMS, and sensitive gate operation in through-hole packaging. However, it uses SOT-82 footprint instead of TO-251, requiring PCB redesign. Gate trigger voltage is higher (1.5V vs. 800mV) and on-state voltage is higher (1.8V vs. 1.6V). Substitution requires footprint change and gate drive circuit verification.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts listed are ROHS3 compliant. S6004VS2TP, TS420-600H, TS820-600H, TS1220-600H, and TS820-600H carry REACH Unaffected status. BT148-600R,127 carries REACH Affected status. MCR708A1G carries REACH Unaffected status. All parts are classified under ECCN EAR99 and HTSUS 8541.30.0080.

Q: Which substitute has the highest inventory availability?

A: TS1220-600H has the highest inventory with 41,300 pcs in stock, followed by BT148-600R,127 with 10,328 pcs. S6004VS2TP has 3,834 pcs available. For immediate availability with direct compatibility, S6004VS2TP is recommended.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message