CQ3P-40B Equivalent & Substitute Parts

Part Overview

The CQ3P-40B is a TRIAC rated for 40A at 200V in TO-3 packaging, manufactured by Central Semiconductor Corp. This component is classified as obsolete and no longer in active production. Due to its obsolete status and limited availability, identifying functionally equivalent substitute components is essential for system redesign, maintenance, and long-term supply chain continuity.

Substiute Parts

CQ3P-40B

Central Semiconductor CorpIn Stock: 884CQ3P-40B Datasheet

Current PartRFQ

BTA40-600B

STMicroelectronicsIn Stock: 16391BTA40-600B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The BTA40-600B qualifies as a functional substitute based on the following substitution criteria:

Current Rating Compatibility: Both the CQ3P-40B and BTA40-600B are rated for 40A on-state current (It (RMS) Max), meeting the primary load-handling requirement.

Voltage Rating Consideration: The BTA40-600B is rated for 600V off-state voltage, which exceeds the CQ3P-40B's 200V rating. This higher voltage rating provides enhanced margin and is acceptable for applications originally designed for 200V operation.

TRIAC Configuration: Both components are single-configuration TRIACs with standard switching characteristics suitable for AC load control applications.

Availability and Status: The BTA40-600B is in active production with substantial inventory (16,285 pcs), ensuring reliable supply compared to the obsolete CQ3P-40B.

Parameter Comparison

Engineering Selection Recommendations

The BTA40-600B is suitable as a substitute for the CQ3P-40B in applications requiring 40A TRIAC functionality. The higher voltage rating (600V vs. 200V) does not compromise performance in 200V-rated circuits and provides additional design margin. The BTA40-600B's active production status and ROHS3 compliance make it appropriate for new designs and legacy system updates. Mechanical integration requires verification due to packaging differences (RD91 Chassis Mount vs. TO-3).

Frequently Asked Questions (FAQ)

Q: Can the BTA40-600B directly replace the CQ3P-40B without circuit modifications?

A: The BTA40-600B matches the 40A current rating and exceeds the voltage requirement. However, packaging and mounting differences (RD91 Chassis Mount vs. TO-3) require mechanical and thermal design review before direct substitution.

Q: Why is the BTA40-600B rated for 600V when the original part is 200V?

A: Higher voltage ratings in TRIAC components do not degrade performance in lower-voltage applications. The 600V rating provides additional safety margin and is a standard characteristic of the BTA40 series across multiple voltage variants.

Q: What compliance certifications apply to the BTA40-600B?

A: The BTA40-600B is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic components.

Q: Are there thermal or mounting considerations when substituting these parts?

A: Yes. The CQ3P-40B uses TO-3 packaging while the BTA40-600B uses RD91 Chassis Mount packaging. Thermal dissipation characteristics and mechanical mounting must be evaluated for the specific application.

Q: What is the gate trigger voltage specification for the BTA40-600B?

A: The gate trigger voltage (Vgt) maximum is 1.3V, and the gate trigger current (Igt) maximum is 50mA, with a hold current (Ih) maximum of 80mA.