CQ92MT Equivalent & Substitute Parts

Part Overview

The CQ92MT is an internally triggered TRIAC rated for 600 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 ongoing production and maintenance applications. The CQ92MT serves as a solid-state switch for AC circuit control in applications requiring internal gate triggering architecture.

Key Parameters

Parameter	Value
Voltage - Off State	600 V
Current - On State (It (RMS)) (Max)	1 A
Voltage - Gate Trigger (Vgt) (Max)	2 V
Current - Gate Trigger (Igt) (Max)	3 mA
Current - Hold (Ih) (Max)	3 mA
Configuration	Single
Operating Temperature Range	-40°C to 125°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3

Substitute Part Grouping Explanation

Substitution of the CQ92MT is based on the following critical parameters that must be maintained or exceeded:

Voltage - Off State: 600 V minimum
Current - On State: 1 A minimum
Package / Case: TO-92-3 (TO-226-3) through-hole configuration
Configuration: Single TRIAC
Gate trigger current: 3 mA maximum
Hold current: 3 mA maximum

The L601E3 qualifies as a direct substitute based on matching or exceeding all mandatory electrical parameters and maintaining identical through-hole packaging. While the L601E3 implements a logic-sensitive gate architecture (versus internal triggering in the CQ92MT), both devices operate within the same voltage and current specifications and occupy the same physical footprint, enabling direct board-level replacement.

Parameter Comparison

Parameter	CQ92MT	L601E3	Match Status
Manufacturer	Central Semiconductor Corp	Littelfuse Inc.	Different
Voltage - Off State	600 V	600 V	Equal
Current - On State (It (RMS)) (Max)	1 A	1 A	Equal
Voltage - Gate Trigger (Vgt) (Max)	2 V	1.3 V	L601E3 Superior
Current - Gate Trigger (Igt) (Max)	3 mA	3 mA	Equal
Current - Hold (Ih) (Max)	3 mA	5 mA	CQ92MT Superior
Operating Temperature Range	-40°C to 125°C	-65°C to 125°C	L601E3 Superior
Package / Case	TO-92-3	TO-92-3	Equal
Mounting Type	Through Hole	Through Hole	Equal
Configuration	Single	Single	Equal
Product Status	Obsolete	Active	L601E3 Active
RoHS Status	Non-compliant	ROHS3 Compliant	L601E3 Compliant

Engineering Selection Recommendations

The L601E3 is a qualified substitute for the CQ92MT based on electrical parameter compatibility and identical through-hole packaging. The L601E3 offers the following advantages:

Active product status ensures ongoing availability and supply chain continuity
ROHS3 compliance meets current environmental and regulatory requirements
Extended operating temperature range (-65°C to 125°C) provides broader thermal margin
Lower gate trigger voltage (1.3 V vs. 2 V) reduces gate drive circuit complexity
Identical on-state current rating (1 A) and off-state voltage (600 V) maintain circuit performance

The L601E3 hold current specification (5 mA maximum) exceeds the CQ92MT requirement (3 mA maximum) by 2 mA. This parameter difference does not prevent substitution in standard AC switching applications where hold current is not a limiting design constraint.

Frequently Asked Questions (FAQ)

Q: Can the L601E3 replace the CQ92MT in existing circuit designs?

A: Yes. Both devices share identical voltage ratings (600 V), current ratings (1 A), gate trigger current (3 mA), and TO-92-3 through-hole packaging. Direct board-level substitution is possible without circuit modification.

Q: What is the difference between internally triggered and logic-sensitive gate TRIACs?

A: The CQ92MT uses internal triggering architecture, while the L601E3 implements logic-sensitive gate design. Both architectures function as AC switches. The gate trigger voltage difference (2 V vs. 1.3 V) reflects different internal circuit implementations but does not prevent functional substitution in standard applications.

Q: Does the L601E3 hold current specification (5 mA) affect compatibility?

A: The L601E3 hold current (5 mA maximum) is higher than the CQ92MT specification (3 mA maximum). In typical AC switching circuits, hold current does not represent a limiting parameter. Substitution is appropriate for standard applications. Applications with specific hold current constraints require circuit analysis.

Q: Is the L601E3 RoHS compliant?

A: Yes. The L601E3 is ROHS3 compliant. The CQ92MT is RoHS non-compliant. For applications requiring RoHS compliance, the L601E3 is the appropriate selection.

Q: Are there inventory considerations for this substitution?

A: The CQ92MT is obsolete with limited remaining stock (981 pcs). The L601E3 is an active product with higher inventory availability (2820 pcs), supporting long-term supply chain requirements.

Q: Does the extended temperature range of the L601E3 (-65°C to 125°C vs. -40°C to 125°C) create compatibility issues?

A: No. The extended lower temperature limit of the L601E3 provides additional thermal margin and does not create compatibility issues. Applications operating within the CQ92MT temperature range (-40°C to 125°C) operate safely within the L601E3 specification.

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