Bourns 2028-42-ALF Gas Discharge Tube - Equivalent & Substitute Parts

Part Overview

The Bourns 2028-42-ALF is a 3-pole gas discharge tube (GDT) rated for 420V DC spark-over voltage with 20kA impulse discharge current capacity. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system maintenance and new design implementations. The 2028 series has been superseded by the TRIGARD® 2026 series, which maintains identical electrical and mechanical specifications while offering active product status and improved availability.

Substiute Parts

2028-42-ALF

Bourns Inc.In Stock: 8692028-42-ALF Datasheet

Current PartRFQ

2026-42-ALF

Bourns Inc.In Stock: 7352026-42-ALF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2028-42-ALF is determined by strict equivalence across the following critical parameters:

• Voltage - DC Spark Over (Nominal): 420 V
• Impulse Discharge Current (8/20µs): 20000A (20kA)
• Tolerance: ±20%
• Number of Poles: 3
• Fail Short characteristic: No
• Package / Case: Cylinder No Lead, 3 Terminal
• Mounting Type: User Defined

The Bourns TRIGARD® 2026-42-ALF meets all these criteria and qualifies as a direct substitute. Both components share identical electrical performance specifications and mechanical form factors, ensuring functional compatibility in existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

The Bourns TRIGARD® 2026-42-ALF is the direct equivalent for the obsolete 2028-42-ALF. Selection of the 2026-42-ALF is supported by:

• Identical electrical specifications (420V spark-over, 20kA discharge current)
• Matching mechanical form factor and terminal configuration
• Active product status ensuring long-term availability and supply chain continuity
• Equivalent regulatory compliance (ROHS3, REACH Unaffected, EAR99 classification)
• Maintained tariff classification (HTSUS 8536.30.8000)

No design modifications are required for component substitution. The 2026-42-ALF integrates directly into existing PCB layouts and circuit designs without functional or performance degradation.

Frequently Asked Questions (FAQ)

Q: Can the 2026-42-ALF be used as a direct replacement for the 2028-42-ALF?

A: Yes. Both components share identical voltage ratings (420V DC spark-over), discharge current capacity (20kA), tolerance (±20%), pole configuration (3-pole), and package form factor (Cylinder No Lead, 3 Terminal). No circuit modifications are necessary.

Q: Why is the 2028-42-ALF classified as obsolete?

A: The 2028 series has been discontinued by Bourns Inc. in favor of the TRIGARD® 2026 series, which provides equivalent performance with improved manufacturing and supply chain support.

Q: Are there any compliance differences between the two parts?

A: No. Both components maintain ROHS3 compliance, REACH Unaffected status, and EAR99 export classification. Regulatory requirements are identical.

Q: What is the physical difference between the 2028-42-ALF and 2026-42-ALF?

A: Both components use the same Cylinder No Lead, 3 Terminal package configuration. Physical dimensions and terminal spacing are compatible for direct PCB substitution.

Q: Is inventory availability a factor in selecting the 2026-42-ALF?

A: The 2026-42-ALF carries active product status with current manufacturing support, ensuring reliable long-term availability. The 2028-42-ALF is obsolete with limited remaining stock.