CS3P-40D TRIAC Equivalent & Substitute Parts

Part Overview

The CS3P-40D is a 40A 400V TRIAC manufactured by Central Semiconductor Corp in TO-3 packaging. This component is classified as obsolete and is no longer in active production. Due to its obsolete status, sourcing original units becomes increasingly difficult. Identifying qualified substitute parts ensures design continuity and maintains system reliability for applications requiring TRIAC functionality in this amperage and voltage class.

Substiute Parts

CS3P-40D

Central Semiconductor CorpIn Stock: 1185CS3P-40D Datasheet

Current PartRFQ

BTA40-600B

STMicroelectronicsIn Stock: 16391BTA40-600B Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CS3P-40D is determined by the following critical parameters:

• Current Rating: Minimum 40A on-state current (It (RMS))
• Voltage Rating: Minimum 400V off-state voltage (Voff)
• Device Type: Single TRIAC configuration
• Thermal Performance: Operating temperature range compatibility

The BTA40-600B qualifies as a substitute because it meets or exceeds the current and voltage requirements of the original part. The BTA40-600B provides 40A at 600V, which encompasses the CS3P-40D specifications. Packaging differences (RD91 vs. TO-3) require mechanical evaluation for board-level integration.

Parameter Comparison

Engineering Selection Recommendations

The BTA40-600B is an active production substitute for the obsolete CS3P-40D. Selection of this substitute is based on:

• Electrical Equivalence: Both devices are 40A TRIACs; the BTA40-600B's 600V rating provides margin above the 400V requirement
• Product Availability: The BTA40-600B maintains active production status with 16,285 units in stock, ensuring supply chain continuity
• Compliance: The BTA40-600B carries ROHS3 compliance and REACH unaffected status, meeting modern regulatory requirements
• Mechanical Integration: Packaging transition from TO-3 to RD91-3 (Chassis Mount) requires PCB layout and thermal management verification

Frequently Asked Questions (FAQ)

Q: Can the BTA40-600B directly replace the CS3P-40D without circuit modification?

A: Electrical substitution is valid based on current and voltage ratings. However, the packaging change from TO-3 to RD91-3 requires mechanical and thermal evaluation. PCB mounting, heatsinking, and lead configuration must be assessed for your specific application.

Q: What does the higher 600V rating on the BTA40-600B mean for my 400V application?

A: The 600V rating indicates the maximum off-state voltage the device can withstand. Operating at 400V is within the BTA40-600B's safe operating area and provides additional voltage margin for transient protection.

Q: Are there any compliance differences between the CS3P-40D and BTA40-600B?

A: The CS3P-40D is obsolete with unspecified compliance status. The BTA40-600B is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Q: What are the gate trigger characteristics of the BTA40-600B?

A: The BTA40-600B has a maximum gate trigger voltage (Vgt) of 1.3V and maximum gate trigger current (Igt) of 50mA, with a maximum hold current (Ih) of 80mA. Verify these parameters against your gate drive circuit design.

Q: How does the RD91 package differ from TO-3?

A: The RD91-3 is an insulated chassis mount package designed for direct mounting to heatsinks, whereas TO-3 is a threaded stud package. Thermal management and PCB layout strategies differ between these form factors.