GTCA28-301L-P05 Gas Discharge Tube Equivalent & Substitute Parts

Part Overview

The GTCA28-301L-P05 is a 2-pole gas discharge tube (GDT) rated for 300V DC spark-over voltage with 5kA impulse discharge current capacity. Manufactured by Littelfuse under the GT series, this component is designed for through-hole mounting in axial cylinder configuration. The part is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations.

Substiute Parts

GTCA28-301L-P05

LittelfuseIn Stock: 1060GTCA28-301L-P05 Datasheet

Current PartRFQ

GTCA28-301M-R05

Littelfuse Inc.In Stock: 1767GTCA28-301M-R05 Datasheet

DirectRFQ

CG2350L

LittelfuseIn Stock: 4412CG2350L Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for gas discharge tubes is determined by the following critical parameters:

• Voltage Rating (DC Spark Over): Must match or exceed the original specification to ensure proper protection threshold
• Impulse Discharge Current Capacity: Must meet or exceed the original rating to handle transient events
• Number of Poles: Must match the circuit configuration requirement
• Mounting Type: Must be compatible with the PCB or assembly design
• Package Configuration: Must fit the physical space constraints

Two substitute parts are identified:

Direct Substitute (GTCA28-301M-R05): Maintains identical voltage (300V) and current (5kA) ratings with matching pole count and mounting type. Differs only in tolerance specification (±20% vs. ±15%) and packaging format (Tray vs. individual). Product status is Active, ensuring continued availability.

Enhanced Capability Substitute (CG2350L): Provides higher voltage rating (350V) and significantly higher impulse discharge current (20kA). Maintains 2-pole configuration and through-hole mounting. Represents an upgrade path for applications requiring greater transient protection margin.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement: GTCA28-301M-R05 is the primary substitute for GTCA28-301L-P05. Both components share identical electrical specifications (300V, 5kA) and mechanical compatibility. The tolerance difference (±20% vs. ±15%) is within acceptable engineering margins for gas discharge tube applications. Active product status ensures supply chain continuity and technical support availability.

For Enhanced Protection Applications: CG2350L provides upgraded performance with 350V spark-over voltage and 20kA impulse current capacity. This substitute is appropriate when system requirements allow for higher protection thresholds or when design margins require additional transient suppression capability. All three parts maintain ROHS3 compliance and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can GTCA28-301M-R05 be used as a direct drop-in replacement for GTCA28-301L-P05?

A: Yes. Both parts share identical voltage (300V), current (5kA), pole count (2), and mounting configuration (through-hole axial cylinder). The tolerance specification difference (±20% vs. ±15%) does not affect functional compatibility in standard applications.

Q: What is the primary reason to consider CG2350L as a substitute?

A: CG2350L provides enhanced transient protection with 350V spark-over voltage and 20kA impulse current capacity compared to the original 300V/5kA specification. This upgrade is suitable for applications requiring greater protection margin or higher energy transient events.

Q: Are all three parts physically compatible with the same PCB footprint?

A: Yes. All three components use through-hole mounting with axial cylinder packaging, ensuring mechanical compatibility with existing PCB designs.

Q: What is the significance of the obsolete status for GTCA28-301L-P05?

A: Obsolete status indicates the part is no longer manufactured. GTCA28-301M-R05 (Active status) is the recommended substitute to ensure continued availability and supply chain reliability.

Q: Do all substitute parts meet the same compliance requirements?

A: Yes. GTCA28-301M-R05 and CG2350L both maintain ROHS3 compliance, EAR99 export classification, and REACH unaffected status, matching the regulatory profile of the original part.