LA Series Radial Lead Varistors Overview
The LA Series from Littelfuse consists of radial leaded varistors designed for continuous operation across AC power lines, providing protection against transient voltage surges. Recognized by UL, the series offers compact solutions with minimal mounting space and comes in various lead form options to cater to different application needs.
Product Variants and Features
The series features varistors in four model sizes (7mm, 10mm, 14mm, 20mm), with operating voltage ranges from 130V to 1000V AC RMS, a DC voltage range of 175V to 1200V, and energy absorption capability of up to 360J. Additionally, select models are designed with an A or B suffix to denote standard and lower clamping voltage versions, respectively. Aside from these, the varistors come lead-free, RoHS compliant, operate effectively up to 85°C without derating, and are available in both tape and reel or bulk packing options.
Maximum Ratings and Performance Specifications
The absolute maximum ratings include a continuous applied voltage range to a peak pulse current with a range from 1200 to 6500 for an 8/20µs current wave, a single pulse energy range from 11 to 360J, and an operational temperature spectrum from -55 to +85°C. For insulation, a high-potency encapsulation withstands a voltage capability of 2500V (depending on the model), with an insulation resistance of 1000MΩ minimum.
Ratings and Specifications at 85°C and 25°C
The datasheet presents detailed tables illustrating maximum ratings at 85°C, including the model’s steady state applied voltages for AC and DC current, energy absorption, and peak current. Concurrently, specifications at a standard temperature of 25°C are furnished, detailing varistor voltage at 1mA DC test current, maximum clamping voltage, maximum peak current for both an 8×20µs and a 10×1000µs current wave, and typical capacitance at 1MHz. The tables list a wide range of specific part numbers for standard and RoHS compliant models for convenient reference.
Regulatory Conformity and Quality Assurance
Adherence to agency approvals is confirmed, with agency file numbers listed for reference, ensuring product users that the LA Series varistors meet rigorous industry standards and governmental regulations. For additional and most up-to-date specifications, users are directed to the Littelfuse website.
Important Notice and Revision
The datasheet content includes a caution regarding absolute maximum ratings, which should not be exceeded to avoid potential damage to the device. The document concludes by reiterating that specifications are subject to change, and the provided revision date indicates the latest update to the datasheet information.
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