S4008DRP SCR 400V 8A TO-252 Equivalent & Substitute Parts

Part Overview

The S4008DRP is a silicon-controlled rectifier (SCR) manufactured by Littelfuse Inc., rated for 400V off-state voltage with 8A RMS on-state current capability. This thyristor is designed for surface mount applications in the TO-252 (DPAK) package and maintains active product status with full RoHS3 compliance. Equivalent and substitute parts are identified based on matching electrical ratings, thermal characteristics, and mechanical compatibility within the SCR thyristor category.

Substiute Parts

S4008DRP

Littelfuse Inc.In Stock: 1089S4008DRP Datasheet

Current PartRFQ

S4006DRP

Littelfuse Inc.In Stock: 2283S4006DRP Datasheet

Parametric EquivalentRFQ

TN815-600B-TR

STMicroelectronicsIn Stock: 1583TN815-600B-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the S4008DRP is determined by the following critical parameters:

Voltage Rating Compatibility: Off-state voltage must be equal to or greater than 400V to maintain circuit protection margins.

Current Rating Compatibility: On-state RMS current (It (RMS)) must be equal to or greater than 8A to support the application load without thermal stress.

Gate Trigger Characteristics: Voltage gate trigger (Vgt) and current gate trigger (Igt) must remain within compatible ranges to ensure reliable gate control.

Thermal Operating Range: Operating temperature range must encompass -40°C to 125°C to match environmental specifications.

Package Compatibility: Surface mount TO-252 (DPAK) package with identical pinout configuration is required for direct PCB substitution.

Compliance Requirements: RoHS3 compliance is mandatory for regulatory alignment.

Based on these criteria, the following parts qualify as substitutes:

S4006DRP (Littelfuse Inc.): Parametric equivalent with reduced on-state current rating (6A RMS vs. 8A RMS). Maintains 400V voltage rating, identical gate trigger specifications, and TO-252 package compatibility. Suitable for applications with lower current demands.

TN815-600B-TR (STMicroelectronics): Manufacturer-recommended alternative with elevated off-state voltage rating (600V vs. 400V). Maintains 8A RMS on-state current, compatible gate trigger characteristics, and TO-252 package. Provides enhanced voltage margin for higher-voltage circuit applications.

Parameter Comparison

Engineering Selection Recommendations

S4006DRP Selection: This Littelfuse part maintains identical voltage and gate trigger specifications as the S4008DRP while reducing on-state current capacity to 6A RMS. Selection is appropriate for applications where circuit current requirements do not exceed 6A RMS. Both parts share active product status, ROHS3 compliance, and unlimited moisture sensitivity rating, ensuring regulatory and environmental compatibility.

TN815-600B-TR Selection: This STMicroelectronics part provides 600V off-state voltage rating with maintained 8A RMS on-state current. Selection is appropriate for applications requiring higher voltage margins or operating in elevated voltage environments. The part maintains active product status and ROHS3 compliance. The reduced gate trigger voltage (1.3V vs. 1.5V) and lower off-state leakage current (5µA vs. 10µA) represent improved performance characteristics within the same functional category.

All three parts maintain identical operating temperature ranges (-40°C to 125°C), surface mount TO-252 package configuration, and RoHS3 regulatory compliance, supporting direct substitution within these constraints.

Frequently Asked Questions (FAQ)

Q: Can S4006DRP directly replace S4008DRP in all applications?

A: S4006DRP is a parametric equivalent with reduced on-state current rating (6A RMS vs. 8A RMS). Direct substitution is valid only for applications where circuit current demand does not exceed 6A RMS. Both parts share identical voltage ratings, gate trigger specifications, package configuration, and compliance certifications.

Q: What is the primary difference between S4008DRP and TN815-600B-TR?

A: The primary difference is off-state voltage rating: TN815-600B-TR is rated for 600V compared to S4008DRP at 400V. Both maintain 8A RMS on-state current and TO-252 package compatibility. TN815-600B-TR is suitable for higher-voltage circuit applications while maintaining equivalent current handling and thermal characteristics.

Q: Are all three parts pin-compatible in TO-252 package?

A: Yes. All three parts use identical TO-252-3 (DPAK) package configuration with 2 leads plus tab, ensuring mechanical and electrical pin compatibility for direct PCB substitution.

Q: Do all substitute parts meet the same compliance requirements?

A: Yes. S4006DRP, TN815-600B-TR, and S4008DRP all maintain ROHS3 compliance, unlimited moisture sensitivity rating (MSL 1), and active product status, ensuring regulatory and environmental compatibility across all three options.

Q: What is the impact of TN815-600B-TR's lower gate trigger voltage (1.3V vs. 1.5V)?

A: The lower gate trigger voltage in TN815-600B-TR represents improved gate sensitivity, requiring less trigger voltage to initiate SCR conduction. This is a performance enhancement that does not affect substitution compatibility, as the lower value remains within acceptable control circuit parameters.

Q: Can TN815-600B-TR be used in a 400V circuit application?

A: Yes. TN815-600B-TR is rated for 600V off-state voltage, which exceeds the 400V circuit requirement. The higher voltage rating provides additional safety margin and does not negatively impact circuit operation at lower voltages.