Overview of Littelfuse LA Series Varistors
The Littelfuse LA Varistor Series datasheet presents the radial leaded varistors designed for continuous operation across AC power lines. These varistors are compact, space-saving, and come in four model sizes (7mm, 10mm, 14mm, and 20mm), covering an AC voltage range from 130V to 1000V, and feature energy absorption up to 360J. Models in the series can be tailored for clamping voltage with ‘A’ or ‘B’ suffixes indicating standard or lower clamping voltages, respectively.
Agency Approvals
The devices are certified with the UL1449 standard, supporting safety requirements, and adhere to the RoHS directive, ensuring they are lead-free, and halogen-free. These varistors meet global compliance with CECC 42201-006, IEC 61051-1, and IEC 61051-2 standards, notably IEC 60950-1 (Annex Q) for specific 14mm and 20mm models.
Features and Benefits
Highlighted features include a robust energy absorption capability and a wide operating voltage range, with no derating required up to 85°C ambient temperature. These varistors also offer practical packaging options such as tape and reel or bulk pack, adding to their versatile application in various settings.
Technical Specifications
Absolute Maximum Ratings indicate the limits of the varistor’s performance, which include an operating ambient temperature range of -55°C to +85°C and storage temperature range of -55°C to +125°C. The datasheet details steady-state applied voltage ranges for both AC and DC, transient peak pulse current capacity, energy range, and encapsulation ratings, ensuring that the varistor withstands certain stress levels.
LA Series Ratings & Specifications
The datasheet provides a detailed table of maximum ratings and specifications at both 85°C and 25°C, discussing continuous and transient varistor voltage, typical clamping voltage, peak current, energy absorption, and capacitance. Part numbers correlate with the physical size of the discs and various electrical parameters, aiding in precise selection for specific applications.
Cautionary Notes
The datasheet concludes with a caution on exceeding absolute maximum ratings, as it may cause permanent damage to the device. It emphasizes that the listed stress ratings are not a part of operational guidelines and should not be exceeded during the device’s normal functioning.
Revisions and Changes
The datasheet acknowledges that specifications may change without notice, with the latest revision indicated by the provided date, ensuring users are aware of the most current product information.
References:
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