CQ92D Equivalent & Substitute Parts

Part Overview

The CQ92D is an internally triggered TRIAC rated for 400 V off-state voltage and 1 A on-state current in a TO-92-3 through-hole package. This component is classified as obsolete, making equivalent substitutes necessary for new designs and production continuity. The CQ92D was manufactured by Central Semiconductor Corp and is no longer in active production, requiring engineers to identify functionally compatible alternatives from active product lines.

Key Parameters

Parameter	Value
Voltage - Off State	400 V
Current - On State (It (RMS)) (Max)	1 A
Voltage - Gate Trigger (Vgt) (Max)	2 V
Current - Gate Trigger (Igt) (Max)	5 mA
Current - Hold (Ih) (Max)	5 mA
Configuration	Single
Operating Temperature Range	-40°C to 125°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3
Triac Type	Internally Triggered

Substitute Part Grouping Explanation

Substitution of the CQ92D is determined by the following critical parameters:

Voltage Rating (Off State): Must be 400 V or higher to maintain circuit protection margins
Current Rating (On State): Must support 1 A RMS or greater
Gate Trigger Voltage (Vgt): Must not exceed 2 V to ensure reliable gate drive compatibility
Gate Trigger Current (Igt): Must not exceed 5 mA to maintain gate circuit compatibility
Hold Current (Ih): Must not exceed 5 mA
Package Type: Must be TO-92-3 through-hole configuration for mechanical and thermal compatibility
Operating Temperature Range: Must cover -40°C to 125°C minimum

The L401E3 from Littelfuse Inc. meets all substitution criteria as an active product with equivalent electrical ratings and identical package configuration.

Parameter Comparison

Parameter	CQ92D (Main Part)	L401E3 (Substitute)	Compatibility
Voltage - Off State	400 V	400 V	Equivalent
Current - On State (It (RMS)) (Max)	1 A	1 A	Equivalent
Voltage - Gate Trigger (Vgt) (Max)	2 V	1.3 V	Compatible (L401E3 lower)
Current - Gate Trigger (Igt) (Max)	5 mA	3 mA	Compatible (L401E3 lower)
Current - Hold (Ih) (Max)	5 mA	5 mA	Equivalent
Configuration	Single	Single	Equivalent
Operating Temperature Range	-40°C to 125°C	-65°C to 125°C	Compatible (L401E3 wider)
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	TO-226-3, TO-92-3	TO-226-3, TO-92-3	Equivalent
Triac Type	Internally Triggered	Logic - Sensitive Gate	Functionally compatible

Engineering Selection Recommendations

The L401E3 is the qualified substitute for the obsolete CQ92D based on the following factors:

Product Status: The L401E3 is an active product from Littelfuse Inc., ensuring long-term availability and supply chain continuity
Electrical Equivalence: All critical electrical parameters meet or exceed CQ92D specifications
Gate Characteristics: The L401E3 features lower gate trigger voltage (1.3 V vs. 2 V) and lower gate trigger current (3 mA vs. 5 mA), providing improved gate drive efficiency
Temperature Range: The L401E3 supports an extended operating temperature range (-65°C to 125°C), offering greater thermal margin
Compliance: The L401E3 is RoHS3 compliant, whereas the CQ92D is RoHS non-compliant
Package Compatibility: Identical TO-92-3 through-hole package ensures direct mechanical and thermal compatibility without PCB redesign

Frequently Asked Questions (FAQ)

Q: Can the L401E3 directly replace the CQ92D without circuit modifications?

A: Yes. The L401E3 meets all electrical parameter requirements and uses the identical TO-92-3 package. Pin configuration and thermal characteristics are compatible for direct substitution.

Q: What is the difference between "Internally Triggered" and "Logic - Sensitive Gate" TRIAC types?

A: Both types function as TRIACs with the same electrical performance in this application. The L401E3's logic-sensitive gate design requires lower trigger voltage and current, which improves gate drive efficiency and reduces power consumption in the gate circuit.

Q: Does the lower gate trigger voltage of the L401E3 affect circuit compatibility?

A: No. Lower gate trigger voltage is a beneficial characteristic that ensures reliable triggering with lower gate drive power. Existing gate drive circuits designed for the CQ92D will operate reliably with the L401E3.

Q: Is the L401E3 suitable for high-temperature applications?

A: The L401E3 supports operation up to 125°C junction temperature, matching the CQ92D maximum. The extended lower temperature limit (-65°C vs. -40°C) provides additional margin for cold-temperature applications.

Q: What is the significance of RoHS3 compliance on the L401E3?

A: RoHS3 compliance indicates the L401E3 meets current environmental and material restriction standards. This is relevant for applications subject to regulatory requirements or customer specifications mandating RoHS compliance.

Q: Are there any package or pinout differences between CQ92D and L401E3?

A: No. Both components use the TO-92-3 (TO-226-3) through-hole package with identical pinout and mechanical dimensions, enabling direct PCB substitution.

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