Overview of ZA Series Radial Lead Varistors by Littelfuse
Littelfuse presents the ZA Series Radial Lead Varistors, specialized components designed for transient voltage surge suppression, essential in protecting low and medium-voltage circuits in a variety of applications. These Metal-Oxide Varistors (MOVs) are especially well-suited for environments like motor control, telecom, solenoid, and power supply circuits where maintenance of data integrity and protection of circuit board components are crucial. Available in five diameters – 5mm, 7mm, 10mm, 14mm, and 20mm – the ZA Series is versatile for different design needs and offers a broad range of operational voltages from as low as 5.5V up to 615V.
Key Features
These varistors are notable for their:
- RoHS Compliance: Lead-free, halogen-free, and conforming to RoHS standards.
- Wide Voltage Range: Operates within an AC voltage range of 4V to 460V and a DC voltage range of 5.5V to 615V.
- Temperature Endurance: No derating required up to an ambient temperature of 85°C.
- Multiple Sizes: Availability in five distinct sizes to cater to diverse design requirements.
- Flexible Packaging: Offered in both tape and reel or bulk pack and standard lead form options.
Agency Approvals and Standards
The ZA Series Varistors have been approved by reputable agencies, underlining their reliability and safety. They are compliant with various international standards, such as UL1449, IEC 60950-1 (Annex Q), and others, indicating the varistors’ performance is of a recognized standard.
Absolute Maximum Ratings and Specifications
Littelfuse provides detailed information on the absolute maximum ratings for the continuous state and transient conditions of the ZA Series Varistors. Critical specs include:
- Operating Temperature Range: From -55°C up to +85°C for ambient temperature, with a storage temperature range extending to +125°C.
- Maximum Energy Absorption: Varies from 0.1 to 52 Joules for single pulse energy, signifying the varistor’s capability to handle energy surges.
- Insulation Resistance: A high resistance value of 1000 MΩ, ensuring robust insulation performance.
- Hi Pot Encapsulation: Guarantees isolation voltage capability of 2500V, providing additional safety against high voltage spikes.
Product Specifications at 25°C
The ZA Series specifications table displays maximum ratings and typical values for various parameters, including clamping voltage, energy absorption, and capacitance across different model sizes, thus enabling designers to choose the most suitable varistor for their specific circuit protection needs.
As safety precautions, the datasheet notices stress the importance of operating the varistors within their specified ratings to prevent permanent damage. Users are encouraged to refer to the ZA Series Device Ratings and Specifications Table for more detailed part number and brand information.
The datasheet reserves the right to change specifications without notice, with the last revision on December 12, 2018.
References:
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