ZA Series Radial Lead Varistors Datasheet by Littelfuse

Category: Electronics, Littelfuse Inc, Resistors

ZA Series Radial Lead Varistors Overview

The ZA Series datasheet provides detailed information on transient voltage surge suppressors known as Metal-Oxide Varistors (MOVs). These components are essential for protecting low and medium-voltage circuits in a range of applications, including motor control, telecom, solenoid, and power supply systems. The datasheet highlights the series’ capability to maintain circuit integrity and protect electronic components from surge-related damage.

Key Features

Compliance: Lead-free, halogen-free, and RoHS compliant, meeting several industry standards, including UL1449, CECC 42201-006, IEC 61051-1, IEC 61051-2, and IEC 60950-1 (Annex Q).
Voltage Range: With a wide operational voltage range, these varistors are rated from 4V to 460V for AC voltage and 5.5V to 615V for DC voltage.
Temperature Resilience: Devices can operate without derating at up to 85°C, ensuring reliable performance in various temperatures.
Variety of Sizes: Available in five model sizes (5mm, 7mm, 10mm, 14mm, and 20mm) to suit various circuit designs and applications.

Absolute Maximum Ratings and Specifications

Absolute Maximum Ratings detail the limits beyond which the device may suffer permanent damage. The datasheet specifies:

Peak Pulse Current: Ranging from 50A to 6500A for an 8/20us current wave.
Energy Absorption: Single pulse energy range is from 0.1J to 52J, applicable for a 10/1000μs waveform.
Operating and Storage Temperatures: These MOVs operate effectively within a temperature range of -55°C to +85°C and can be stored between -55°C to +125°C.
Insulation Resistance: With a high insulation resistance of 1000MΩ, the varistors ensure safety and stability.

The ZA Series is also equipped with standard lead form options and packaging variations, such as tape and reel or bulk pack, accommodating both hard-wired and PCB designs.

ZA Series Ratings & Specifications Table

Detailed in a comprehensive table, the ZA Series Ratings & Specifications include maximum ratings at 85°C and typical specifications at 25°C. The table covers continuous and transient varistor voltage, maximum current, clamping voltage, energy, and capacitance across different model sizes and part numbers, offering a clear data-driven guide for selection based on application requirements.

Agency Approvals and Part Numbering

Products in the ZA Series have agency approvals, underscored by file numbers E320116 and E1273/F from UL and CECC, respectively. A list of part numbers and corresponding branding is also provided for user convenience.