SL1122A450 Equivalent & Substitute Parts

Part Overview

The SL1122A450 is a Gas Discharge Tube (GDT) rated for 450V DC spark-over voltage with 10kA impulse discharge current capacity in a 3-pole through-hole configuration. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement planning. The SL1122A450 series has been superseded by active production alternatives that maintain electrical and mechanical compatibility while offering improved availability.

Substiute Parts

SL1122A450

Littelfuse Inc.In Stock: 798SL1122A450 Datasheet

Current PartRFQ

SL1021A450R

Littelfuse Inc.In Stock: 1324SL1021A450R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SL1122A450 is based on strict equivalence of the following electrical and mechanical parameters:

• Voltage - DC Spark Over (Nominal): 450V
• Impulse Discharge Current (8/20µs): 10000A (10kA)
• Number of Poles: 3
• Mounting Type: Through Hole
• Fail Short Characteristic: No
• RoHS Compliance: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

The SL1021A450R substitute maintains all critical electrical specifications and environmental compliance requirements. The primary difference lies in the package configuration: the SL1122A450 uses a Radial Cylinder 3-lead package, while the SL1021A450R uses an Axial Cylinder 3-lead (Radial Bend) package. Both configurations are through-hole mounting types suitable for PCB assembly.

Parameter Comparison

Engineering Selection Recommendations

The SL1021A450R is the manufacturer-recommended substitute for the obsolete SL1122A450. Both components are manufactured by Littelfuse Inc. and maintain identical electrical performance specifications for 450V DC spark-over voltage and 10kA impulse discharge current capacity.

The SL1021A450R offers the advantage of active product status, ensuring continued availability and supply chain support. Both parts maintain ROHS3 compliance and MSL 1 (Unlimited) environmental ratings, meeting the same regulatory and reliability requirements.

The primary consideration for implementation is the package configuration difference: the SL1021A450R uses an axial cylinder lead configuration with radial bend, compared to the radial cylinder configuration of the SL1122A450. PCB layout and lead spacing must accommodate this package geometry change during design transition.

Frequently Asked Questions (FAQ)

Q: Can the SL1021A450R directly replace the SL1122A450 in existing designs?

A: Electrical performance is identical. Physical package geometry differs between radial cylinder and axial cylinder (radial bend) configurations. PCB footprint and lead spacing must be evaluated for compatibility with your specific board layout.

Q: What is the primary reason for substitution?

A: The SL1122A450 is classified as obsolete. The SL1021A450R is the active production equivalent from the same manufacturer, providing continued component availability and supply chain support.

Q: Are the RoHS and environmental compliance ratings the same?

A: Yes. Both the SL1122A450 and SL1021A450R are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings, meeting identical regulatory and environmental requirements.

Q: What are the key electrical parameters that define substitution eligibility?

A: Substitution is based on 450V DC spark-over voltage, 10kA impulse discharge current (8/20µs), 3-pole configuration, through-hole mounting type, and non-fail-short characteristic. All these parameters are identical between the main part and substitute.

Q: Does packaging affect electrical performance?

A: No. The package configuration difference (radial cylinder versus axial cylinder with radial bend) does not affect electrical specifications. The difference is purely mechanical and relates to PCB layout considerations.