Overview of Littelfuse High-Reliability Varistors
Littelfuse, a renowned expert in circuit protection, presents its range of High-Reliability Varistors designed for applications demanding stringent quality and reliability, such as military standards. These varistors are particularly noted for performance that meets or exceeds specifications outlined in MIL-STD-19500, MIL-STD-750, and MIL-STD-202. In comparison to Silicon Diode suppressors, Littelfuse Varistors offer enhanced radiation hardiness.
Product Range and Qualifications
The High-Reliability Varistor line includes varistors that are part of the Defense Supply Center Columbus (DSSC) Qualified Parts List (QPL) MIL-R-83530, with four items currently available. They are manufactured in compliance with a system conforming to MILI-45208 and MILQ-9858. Moreover, the series lists 29 Littelfuse High Reliability Series TX Equivalents. Each product in this series boasts a range of approvals from various agencies, including DSSC Approved QPL, CECC Certified, ISO Approved, UL Recognized, and CSA Certified.
Customization and Additional Resources
Littelfuse also caters to custom requirements, offering varistors processed to customer-specific demands or to a Standard Military Flow. For government use, the Littelfuse ZA Series has been designated with Commercial Item Descriptors (CID), specifically CID AA-55564-3.
Product Specifications and Inspections
Detailed in the datasheet are the specifications of the MIL-R-83530/1 varistor series, including ratings for voltage, clamping voltage, energy, varistor tolerance, and nominal clamping voltage at peak current with respective part numbers such as 1-2000B, 1-2200D, 1-4300E, and 1-5100E.
Inspections cover a robust list of quality assurance tests, classified into Groups A, B, and C. These inspection categories encompass tests such as High Temperature Life, Thermal Shock, Power Burn-In, Varistor Voltage, Visual and Mechanical Examination, Solderability, Dielectric Withstanding Voltage, Terminal Strength, Moisture Resistance, and more. Tables presented in the datasheet detail inspection plans, with specifications on Acceptable Quality Levels (AQL) for major and minor defects, alongside cross-references for the closest commercial equivalents.
The High-Reliability Varistors are backed by Littelfuse’s commitment to continuous product enhancement, and specifications may be updated to incorporate the latest advancements.
Note
All the information provided in this summary reflects the data as of the last revision date noted as September 3, 2014. Product specifications are subject to change, and it’s advisable to refer to the latest datasheet for the most up-to-date information.
References:
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