S4008VTP Equivalent & Substitute Parts

Part Overview

The S4008VTP is a Silicon Controlled Rectifier (SCR) manufactured by Littelfuse, rated for 400V off-state voltage with 8A RMS on-state current capability. This component is designed for standard recovery applications in Through Hole TO-251 packaging. The part maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Equivalent and substitute parts are identified based on matching electrical characteristics and mechanical compatibility within the thyristor category.

Key Parameters

Parameter	Value
Voltage - Off State	400 V
Current - On State (It (RMS)) (Max)	8 A
Current - On State (It (AV)) (Max)	5.1 A
Voltage - Gate Trigger (Vgt) (Max)	1.5 V
Current - Gate Trigger (Igt) (Max)	15 mA
Voltage - On State (Vtm) (Max)	1.6 V
Current - Hold (Ih) (Max)	30 mA
Operating Temperature Range	-40°C to 125°C
Package / Case	TO-251-3 Short Leads, IPak, TO-251AA
Mounting Type	Through Hole
SCR Type	Standard Recovery

Substitute Part Grouping Explanation

Substitution eligibility for the S4008VTP is determined by the following critical parameters:

Voltage Rating Compatibility: Off-state voltage must match at 400V to ensure equivalent blocking capability and circuit protection characteristics.

Gate Trigger Parameters: Voltage gate trigger (Vgt) and current gate trigger (Igt) must remain constant at 1.5V maximum and 15mA maximum respectively to maintain gate drive circuit compatibility.

On-State Voltage: Voltage on-state (Vtm) must not exceed 1.6V maximum to preserve conduction losses and thermal performance.

Hold Current: Hold current (Ih) must remain at 30mA maximum for consistent latching behavior.

Package and Mounting: Through Hole mounting in TO-251-3 Short Leads configuration is required for mechanical and thermal interface compatibility.

SCR Type: Standard Recovery classification ensures consistent switching characteristics.

Compliance Status: RoHS3 compliance and REACH unaffected status must be maintained.

The S4008VTP current rating of 8A RMS represents the upper performance specification. Parts with lower on-state current ratings (It (RMS)) may serve as substitutes in applications where the full 8A capacity is not required, provided all other electrical parameters remain within specification.

Parameter Comparison

Parameter	S4008VTP (Main Part)	S4006VTP (Substitute)
Manufacturer	Littelfuse	Littelfuse Inc.
Category	Thyristors	Thyristors
Voltage - Off State	400 V	400 V
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	1.5 V
Current - Gate Trigger (Igt) (Max)	15 mA	15 mA
Voltage - On State (Vtm) (Max)	1.6 V	1.6 V
Current - On State (It (RMS)) (Max)	8 A	6 A
Current - On State (It (AV)) (Max)	5.1 A	3.8 A
Current - Hold (Ih) (Max)	30 mA	30 mA
Current - Off State (Max)	5 µA	10 µA
Current - Non Rep. Surge 50, 60Hz (Itsm)	83A, 100A	83A, 100A
SCR Type	Standard Recovery	Standard Recovery
Operating Temperature	-40°C to 125°C	-40°C to 125°C
Mounting Type	Through Hole	Through Hole
Package / Case	TO-251-3 Short Leads, IPak, TO-251AA	TO-251-3 Short Leads, IPak, TO-251AA
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

S4008VTP Primary Selection: Use for applications requiring the full 8A RMS on-state current specification. This part is Active status with confirmed inventory of 955 pieces in stock.

S4006VTP Substitute Selection: This part is suitable for applications where on-state current requirements do not exceed 6A RMS. The S4006VTP maintains identical voltage ratings, gate trigger parameters, hold current, and operating temperature range. Both parts share Standard Recovery SCR classification, Through Hole mounting, and TO-251 packaging. The S4006VTP carries Active product status with higher inventory availability (1442 pieces in stock). Both parts maintain full RoHS3 compliance and REACH unaffected status, ensuring regulatory compatibility in equivalent applications.

The primary distinction between these parts is the on-state current capacity. Selection between S4008VTP and S4006VTP depends solely on the circuit's maximum sustained current requirement at rated conditions.

Frequently Asked Questions (FAQ)

Q: Can S4006VTP replace S4008VTP in any application?

A: S4006VTP is suitable only for applications where the maximum on-state current does not exceed 6A RMS. The S4006VTP has lower current capacity (6A RMS vs. 8A RMS) and lower average on-state current (3.8A vs. 5.1A). All other electrical parameters remain identical. Circuit current requirements must be evaluated before substitution.

Q: Are the gate trigger parameters identical between these parts?

A: Yes. Both S4008VTP and S4006VTP have identical gate trigger voltage (1.5V maximum) and gate trigger current (15mA maximum). Gate drive circuits designed for one part will function identically with the other.

Q: Do these parts use the same package?

A: Both parts use Through Hole mounting in TO-251-3 Short Leads configuration (TO-251AA). Mechanical and thermal interface compatibility is maintained. PCB layout and heatsinking requirements remain unchanged between parts.

Q: What is the difference in off-state leakage current?

A: S4008VTP specifies 5µA maximum off-state current, while S4006VTP specifies 10µA maximum. This difference is within standard manufacturing variation for this device class and does not affect circuit functionality in typical applications.

Q: Are both parts RoHS3 compliant?

A: Yes. Both S4008VTP and S4006VTP are RoHS3 compliant with REACH unaffected status. Regulatory requirements are satisfied by either part.

Q: What is the operating temperature range for both parts?

A: Both parts operate from -40°C to 125°C. Thermal design considerations remain identical between S4008VTP and S4006VTP.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message