CQ39DS TRIAC 400V 4A Equivalent & Substitute Parts

Part Overview

The CQ39DS is a standard TRIAC rated for 400V off-state voltage and 4A on-state current in a TO-39 through-hole package. This component is classified as obsolete, making identification of equivalent substitute parts necessary for ongoing design support and production continuity. The CQ39DS maintains RoHS3 compliance and operates across a temperature range of -40°C to 125°C.

Key Parameters

Parameter	Value
Voltage - Off State	400 V
Current - On State (It (RMS)) (Max)	4 A
Voltage - Gate Trigger (Vgt) (Max)	2 V
Current - Gate Trigger (Igt) (Max)	5 mA
Current - Hold (Ih) (Max)	5 mA
Operating Temperature Range	-40°C ~ 125°C
Mounting Type	Through Hole
Configuration	Single

Substitute Part Grouping Explanation

Substitution of the CQ39DS is determined by electrical parameter equivalence across the following critical specifications:

Voltage Rating: Off-state voltage must equal 400V
Current Rating: On-state RMS current must equal 4A
Gate Trigger Parameters: Vgt and Igt values must remain within specified maximums
Hold Current: Ih must not exceed specified maximum
Configuration: Single TRIAC configuration required
Mounting Type: Through-hole mounting required
Temperature Range: Operating temperature capability must support the application environment

The NTE5629 meets these electrical equivalence criteria. Physical package differences (TO-39 versus TO-202) represent the primary distinction between the main part and its substitute.

Parameter Comparison

Parameter	CQ39DS	NTE5629	Match Status
Voltage - Off State	400 V	400 V	Equivalent
Current - On State (It (RMS)) (Max)	4 A	4 A	Equivalent
Voltage - Gate Trigger (Vgt) (Max)	2 V	2 V	Equivalent
Current - Gate Trigger (Igt) (Max)	5 mA	3 mA	NTE5629 Superior
Current - Hold (Ih) (Max)	5 mA	5 mA	Equivalent
Current - Non Rep. Surge 50, 60Hz (Itsm)	35A @ 50Hz	40A @ 60Hz	NTE5629 Superior
Configuration	Single	Single	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Operating Temperature Range	-40°C ~ 125°C	-40°C ~ 110°C	CQ39DS Superior
Package / Case	TO-39	TO-202	Different
Product Status	Obsolete	Active	NTE5629 Active

Engineering Selection Recommendations

CQ39DS to NTE5629 Substitution Basis:

The NTE5629 provides electrical equivalence to the obsolete CQ39DS across all primary TRIAC specifications: 400V off-state voltage, 4A on-state current, and matching gate trigger parameters. The NTE5629 demonstrates superior performance in gate trigger current (3mA versus 5mA maximum) and non-repetitive surge current capability (40A @ 60Hz versus 35A @ 50Hz).

The NTE5629 carries active product status from NTE Electronics, Inc, ensuring ongoing availability and supply chain continuity. However, the NTE5629 is RoHS non-compliant, whereas the CQ39DS maintains RoHS3 compliance. Applications requiring RoHS3 compliance must evaluate this distinction.

The operating temperature range of the NTE5629 extends to 110°C maximum, compared to 125°C for the CQ39DS. Applications operating above 110°C require thermal analysis to confirm compatibility.

Physical package differences exist: the CQ39DS uses TO-39 packaging while the NTE5629 uses TO-202 Long Tab packaging. PCB layout and mechanical mounting must accommodate the TO-202 footprint.

Frequently Asked Questions (FAQ)

Q: Can the NTE5629 directly replace the CQ39DS in all applications?

A: The NTE5629 provides electrical equivalence for TRIAC function. Physical package differences (TO-39 versus TO-202) require PCB layout modification. RoHS compliance status differs between parts. Operating temperature maximum differs by 15°C.

Q: What are the primary electrical differences between CQ39DS and NTE5629?

A: Both parts share identical voltage and current ratings. The NTE5629 features lower maximum gate trigger current (3mA versus 5mA) and higher surge current capability (40A @ 60Hz versus 35A @ 50Hz). These represent performance improvements rather than incompatibilities.

Q: Does the TO-39 to TO-202 package change affect circuit performance?

A: Package change affects PCB layout, mounting hardware, and thermal dissipation characteristics. Electrical performance remains equivalent when proper PCB design accommodates the TO-202 footprint and thermal requirements.

Q: Is the NTE5629 suitable for applications requiring RoHS3 compliance?

A: No. The NTE5629 is RoHS non-compliant. Applications with RoHS3 requirements must source alternative parts or confirm exemption applicability with compliance documentation.

Q: What temperature range should be considered when selecting between CQ39DS and NTE5629?

A: The CQ39DS operates to 125°C; the NTE5629 operates to 110°C. Applications requiring operation above 110°C must use the CQ39DS or identify alternative parts rated for higher temperatures.

Q: Are both parts through-hole mounted?

A: Yes. Both CQ39DS and NTE5629 are through-hole mounted components. Physical package dimensions differ, requiring PCB redesign for package substitution.

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