GTCA28-401L-P05 Equivalent & Substitute Parts

Part Overview

The GTCA28-401L-P05 is a Gas Discharge Tube (GDT) rated for 400V DC spark-over voltage with 5kA impulse discharge current capacity in a 2-pole through-hole configuration. This component is classified as obsolete, necessitating identification of active alternative models to maintain design continuity and ensure supply chain availability for new production and field replacements.

Substiute Parts

GTCA28-401L-P05

Littelfuse Inc.In Stock: 777GTCA28-401L-P05 Datasheet

Current PartRFQ

CG2470L

Littelfuse Inc.In Stock: 1982CG2470L Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the GTCA28-401L-P05 is determined by the following critical electrical and mechanical parameters:

• Voltage Rating (DC Spark Over): The substitute must operate within the system's voltage protection window. The CG2470L operates at 470V, which is 17.5% higher than the original 400V specification.
• Impulse Discharge Current Capacity: The substitute CG2470L provides 20kA capacity, exceeding the original 5kA specification by 300%, offering enhanced surge protection margin.
• Number of Poles: Both the original and substitute maintain 2-pole configuration for identical circuit topology compatibility.
• Mounting Type and Package: Both components use through-hole mounting with axial cylinder packaging, ensuring mechanical and footprint compatibility.
• Fail Mode: Both components maintain non-shorting fail mode characteristics.

The CG2470L is designated as the manufacturer-recommended substitute, indicating Littelfuse Inc. engineering validation for this replacement relationship.

Parameter Comparison

Engineering Selection Recommendations

The CG2470L is the appropriate substitute for the obsolete GTCA28-401L-P05 based on the following engineering criteria:

• Product Status Alignment: The CG2470L maintains active production status, ensuring long-term availability and supply chain continuity compared to the obsolete original part.
• Regulatory Compliance: Both components maintain ROHS3 compliance and REACH unaffected status, satisfying environmental and regulatory requirements without modification to design documentation.
• Mechanical Compatibility: Identical through-hole mounting and axial cylinder packaging enable direct footprint substitution without PCB redesign.
• Electrical Performance: The substitute provides enhanced impulse discharge current capacity (20kA vs. 5kA) and operates at a higher voltage threshold (470V vs. 400V), delivering improved protection margins in surge and transient suppression applications.

Frequently Asked Questions (FAQ)

Q: Can the CG2470L be used as a direct replacement for the GTCA28-401L-P05?

A: Yes. Both components share identical mechanical form factors (through-hole, axial cylinder), 2-pole configuration, and non-shorting fail mode. The substitute is electrically compatible within systems designed for the original specification.

Q: What is the voltage difference between these parts, and does it affect circuit operation?

A: The CG2470L operates at 470V spark-over voltage compared to the original 400V. This 70V difference means the substitute will trigger at a higher transient voltage threshold. Circuit design must accommodate this voltage offset to ensure proper protection activation.

Q: Does the higher impulse discharge current rating of the CG2470L create any compatibility issues?

A: No. The 20kA capacity of the CG2470L exceeds the original 5kA specification, providing additional surge handling capability. This represents an enhancement rather than a limitation for protection applications.

Q: Are there any packaging or inventory considerations?

A: The CG2470L is supplied in tray packaging with 1919 units in stock, compared to the original part's limited obsolete inventory of 679 units. The substitute offers superior supply availability for production requirements.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both the GTCA28-401L-P05 and CG2470L are ROHS3 compliant and REACH unaffected, maintaining identical regulatory status for design documentation and compliance reporting.