SL1122A200 Equivalent & Substitute Parts

Part Overview

The SL1122A200 is a Gas Discharge Tube (GDT) rated for 200V 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 The SL1122A200 series has been superseded by active production alternatives that maintain electrical and mechanical compatibility while offering improved availability.

Substiute Parts

SL1122A200

Littelfuse Inc.In Stock: 989SL1122A200 Datasheet

Current PartRFQ

SL1021A200R

Littelfuse Inc.In Stock: 1255SL1021A200R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SL1122A200 is based on strict equivalence of the following electrical and mechanical parameters:

• Voltage - DC Spark Over (Nominal): 200V
• 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 SL1021A200R qualifies as a manufacturer-recommended substitute by meeting all critical electrical parameters and compliance requirements. The primary difference lies in the package configuration: the SL1122A200 uses a Radial Cylinder 3-lead package, while the SL1021A200R uses an Axial Cylinder 3-lead (Radial Bend) package. Both configurations are through-hole mounting types suitable for PCB integration.

Parameter Comparison

Engineering Selection Recommendations

The SL1021A200R is the manufacturer-recommended substitute for the obsolete SL1122A200. Both components are manufactured by Littelfuse Inc. and maintain identical electrical specifications for voltage rating, discharge current capacity, and pole configuration. Both achieve ROHS3 compliance and carry MSL 1 (Unlimited) moisture sensitivity ratings.

Selection of the SL1021A200R is supported by its active product status, ensuring long-term availability and supply chain continuity. The axial cylinder package configuration with radial bend lead geometry accommodates standard through-hole PCB mounting practices. No electrical performance degradation occurs with this substitution when PCB layout accommodates the alternative lead geometry.

Frequently Asked Questions (FAQ)

Q: Can the SL1021A200R directly replace the SL1122A200 in existing designs?

A: Electrical substitution is valid. The SL1021A200R maintains identical voltage rating (200V DC spark-over), discharge current capacity (10kA), pole count (3), and fail-short characteristic. Physical substitution requires PCB layout verification due to package geometry differences: radial cylinder versus axial cylinder with radial bend leads.

Q: What is the primary difference between these two parts?

A: The SL1122A200 uses a radial cylinder package, while the SL1021A200R uses an axial cylinder package with radial bend leads. Both are through-hole mounting configurations. Lead spacing and PCB footprint geometry differ between the two packages.

Q: Why is the SL1122A200 listed as obsolete?

A: The SL1122A200 has been discontinued by the manufacturer. The SL1021A200R represents the active production alternative with equivalent electrical performance.

Q: Are both parts RoHS compliant?

A: Yes. Both the SL1122A200 and SL1021A200R are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings.

Q: What certifications apply to both parts?

A: Both components share identical ECCN (EAR99) and HTSUS (8536.30.8000) classifications. The SL1021A200R carries additional REACH Unaffected status documentation.