CQD-4M TR13 Equivalent & Substitute Parts

Part Overview

The CQD-4M TR13 is a Logic-Sensitive Gate TRIAC rated for 600V off-state voltage and 4A on-state current in a surface mount DPAK package. Manufactured by Central Semiconductor Corp, this component is classified as obsolete. Due to its obsolete status and limited remaining inventory (898 pcs), identifying active equivalent parts is necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Voltage - Off State	600 V
Current - On State (It (RMS)) (Max)	4 A
Voltage - Gate Trigger (Vgt) (Max)	1.75 V
Current - Gate Trigger (Igt) (Max)	5 mA
Current - Hold (Ih) (Max)	5 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	40A @ 60Hz
Operating Temperature Range	-40°C ~ 125°C (TJ)
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63
Triac Type	Logic - Sensitive Gate
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the CQD-4M TR13 is determined by the following critical parameters:

Voltage Rating (Off State): Must be 600V minimum to maintain voltage withstand capability
Triac Type: Must be Logic-Sensitive Gate configuration
Package: Must be TO-252-3 DPAK surface mount to ensure PCB compatibility
Current Rating: On-state current must meet or exceed 4A RMS
Gate Trigger Parameters: Vgt and Igt must be within acceptable ranges for circuit operation
Product Status: Active status ensures ongoing availability and supply chain support

Two substitute parts meet these criteria:

L6004D3RP (Littelfuse Inc.): Exact current rating match (4A), improved gate trigger specifications, active product status, ROHS3 compliant.

BT137S-600E,118 (WeEn Semiconductors): Higher current rating (8A), improved gate trigger specifications, active product status, RoHS compliant, higher surge current capability.

Parameter Comparison

Parameter	CQD-4M TR13	L6004D3RP	BT137S-600E,118
Manufacturer	Central Semiconductor Corp	Littelfuse Inc.	WeEn Semiconductors
Product Status	Obsolete	Active	Active
Voltage - Off State	600 V	600 V	600 V
Current - On State (It (RMS)) (Max)	4 A	4 A	8 A
Voltage - Gate Trigger (Vgt) (Max)	1.75 V	1.3 V	1.5 V
Current - Gate Trigger (Igt) (Max)	5 mA	3 mA	10 mA
Current - Hold (Ih) (Max)	5 mA	5 mA	20 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	40A @ 60Hz	33A, 40A	65A, 71A
Operating Temperature Range	-40°C ~ 125°C (TJ)	-40°C ~ 110°C (TJ)	125°C (TJ)
Package / Case	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK
Triac Type	Logic - Sensitive Gate	Logic - Sensitive Gate	Logic - Sensitive Gate
RoHS Status	Not specified	ROHS3 Compliant	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

L6004D3RP is the direct functional equivalent, providing identical on-state current (4A) and matching the original operating temperature range (-40°C to 110°C minimum). This part offers improved gate trigger specifications (Vgt 1.3V, Igt 3mA) and carries ROHS3 compliance with active product status, making it suitable for designs requiring exact current rating preservation.

BT137S-600E,118 provides higher current capacity (8A) and improved surge current handling (65A, 71A), offering design margin for applications with variable load conditions. This part is RoHS compliant and actively manufactured. The higher hold current (20mA) and gate trigger current (10mA) must be evaluated against circuit gate drive capabilities.

Both substitutes maintain the TO-252-3 DPAK package footprint and Logic-Sensitive Gate configuration, ensuring PCB compatibility and functional interchangeability within the specified electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can L6004D3RP directly replace CQD-4M TR13 in existing designs?

A: Yes. L6004D3RP maintains identical on-state current (4A), voltage rating (600V), and package (TO-252-3 DPAK). Gate trigger specifications are improved (lower Vgt and Igt), which is compatible with standard gate drive circuits. Operating temperature range is -40°C to 110°C, which covers the original -40°C to 125°C range for most applications.

Q: When should BT137S-600E,118 be selected over L6004D3RP?

A: BT137S-600E,118 is selected when the application requires higher current capacity (8A vs 4A) or improved surge current handling (65A/71A vs 40A). The higher current rating provides design margin for applications with load variations or future scaling requirements.

Q: Are there package compatibility concerns with these substitutes?

A: No. All three parts use the TO-252-3 DPAK package with identical pinout and footprint. PCB layout and soldering processes require no modification.

Q: What are the gate drive implications of switching to these substitutes?

A: L6004D3RP has lower gate trigger specifications (Vgt 1.3V, Igt 3mA) than the original, requiring less gate drive power. BT137S-600E,118 has higher specifications (Vgt 1.5V, Igt 10mA), requiring adequate gate drive current. Both are within standard gate drive circuit capabilities.

Q: Do these substitutes meet current compliance requirements?

A: L6004D3RP is ROHS3 compliant. BT137S-600E,118 is RoHS compliant. Both meet current environmental and regulatory standards for new designs.

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