LA Series Radial Lead Varistors

Category: Electronics, Littelfuse Inc, Resistors

The LA Series Radial Lead Varistors datasheet provides comprehensive information about the transient voltage surge suppressors offered by Littelfuse, intended for continuous operation across AC power lines. These devices are constructed as metal oxide varistors (MOVs) with radial leads and are recognized by UL for safety standards. They are designed to meet space-saving requirements with various standard lead form options available.

Product Variants

There are four available sizes within the LA Series: 7mm, 10mm, 14mm, and 20mm. The series also covers a broad voltage range, with AC RMS voltages from 130V to 1000V and energy absorption capabilities reaching up to 360 joules. Specific models may have clamping voltage options, denoted by suffixes ‘A’ for standard and ‘B’ for lower clamping voltage. Detailed part numbering and specifications can be found in the series’ device ratings and specifications table.

Features and Approvals

Key features include their compliance with lead-free, halogen-free, and RoHS environmental standards, reflecting their suitability for modern eco-friendly applications. Additionally, these varistors are designed to operate effectively without derating up to temperatures of 85°C, and they can be ordered in tape and reel or bulk pack formats depending on assembly requirements.

Agency Approvals

The LA Series varistors are certified by multiple agencies with corresponding file numbers listed, ensuring their adherence to industry safety and performance standards.

Absolute Maximum Ratings

The datasheet outlines strict ‘Absolute Maximum Ratings’, covering continuous steady-state applied voltage, transient peak pulse current, single pulse energy, operating and storage temperatures, and more. The varistors also feature a temperature coefficient for clamping voltage, high-pot encapsulation (with a 2500 VDC isolation voltage capability), and an insulation resistance of 1000 megaohms minimum.

It is cautioned that exceeding the ‘Absolute Maximum Ratings’ may result in permanent damage to the device, emphasizing the importance of adhering to the specified operational limits.

The datasheet also notes that specifications may change without notice and recommends referring to the Littelfuse website for the most current information, with the revision dated August 2010.