S4008DTP Equivalent & Substitute Parts

Part Overview

The S4008DTP is a 400V, 8A standard recovery SCR (silicon-controlled rectifier) manufactured by Littelfuse Inc. in a surface mount TO-252 (DPAK) package. This thyristor is designed for AC switching and power control applications requiring moderate voltage ratings and current handling capabilities. The part is currently active in production with 779 units in stock inventory.

Substitute parts become necessary when the original component experiences extended lead times, supply constraints, or when design requirements permit operation at higher voltage ratings while maintaining compatible electrical and mechanical characteristics.

Substiute Parts

S4008DTP

Littelfuse Inc.In Stock: 869S4008DTP Datasheet

Current PartRFQ

TN815-600B-TR

STMicroelectronicsIn Stock: 1583TN815-600B-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The TN815-600B-TR from STMicroelectronics qualifies as a direct substitute for the S4008DTP based on the following substitution criteria:

Mechanical Compatibility: Both parts use identical surface mount packaging (TO-252-3 DPAK with 2 leads + tab, SC-63 case designation), ensuring PCB footprint and assembly process compatibility.

Electrical Compatibility: The substitute maintains gate trigger characteristics (Vgt Max 1.3V, Igt Max 15mA) and on-state voltage (Vtm Max 1.6V) within acceptable operating margins. Current handling capacity remains at 8A RMS, meeting or exceeding the original specification.

Voltage Rating: The TN815-600B-TR operates at 600V off-state voltage, which is higher than the S4008DTP's 400V rating. This represents an uprated substitute suitable for applications where the circuit voltage does not exceed 400V, providing additional safety margin and component availability flexibility.

Thermal and Compliance: Both parts operate across the identical temperature range (-40°C to 125°C), maintain ROHS3 compliance, and carry unlimited moisture sensitivity level (MSL 1), ensuring manufacturing and environmental compatibility.

Parameter Comparison

Engineering Selection Recommendations

The TN815-600B-TR is qualified as a direct substitute for the S4008DTP in applications where circuit voltage remains at or below 400V. Both components maintain active product status with established manufacturing support and full ROHS3 compliance certification.

Selection between these parts should be based on availability and supply chain requirements. The TN815-600B-TR's higher voltage rating (600V) provides additional design margin for circuits operating below 400V, while the S4008DTP remains the original specification component. Both parts are suitable for production use without design modification when applied within their respective voltage ratings.

Frequently Asked Questions (FAQ)

Q: Can the TN815-600B-TR replace the S4008DTP in a 400V circuit?

A: Yes. The TN815-600B-TR is rated for 600V off-state voltage and is suitable for circuits operating at 400V or lower. The higher voltage rating does not create compatibility issues in lower-voltage applications.

Q: Are the packages identical between these parts?

A: Yes. Both the S4008DTP and TN815-600B-TR use the TO-252-3 DPAK surface mount package with identical pinout and footprint, requiring no PCB layout changes.

Q: What are the key electrical differences between these parts?

A: The primary differences are: (1) off-state voltage rating (400V vs. 600V), (2) gate trigger voltage maximum (1.5V vs. 1.3V), and (3) hold current maximum (30mA vs. 40mA). Gate trigger current, on-state voltage, on-state current, and operating temperature range are identical.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the S4008DTP and TN815-600B-TR are ROHS3 compliant with unlimited moisture sensitivity level (MSL 1) and REACH unaffected status.

Q: Which part should be selected for new designs?

A: Either part is acceptable for new designs. Selection should be based on current availability, supply chain lead times, and design voltage requirements. Both maintain active production status.