The ZA Series of transient voltage surge suppressors, as presented by Littelfuse, are constructed as radial lead varistors (MOVs) targeting the safeguarding of low and medium-voltage circuits and systems. With a principal function of protecting circuit board components and securing data integrity, these MOVs find their applications in motor control, telecom, solenoid, and power supply circuits. The series includes five distinct model sizes, namely 5mm, 7mm, 10mm, 14mm, and 20mm, with an extensive operating voltage range of 4V AC (VMlAC|RMS) to 460V AC and 5.5V to 615V DC (VDClpeak).
Agency Approvals and Features
The ZA Series varistors come with agency approvals from UL and are compliant with various international standards including CECC, IEC, and RoHS. Unique features include a wide operating temperature range from -55°C to +85°C without derating, availability in both tape and reel or bulk packaging, and numerous standard lead form options. The varistors also possess a high insulation resistance of 1000 MΩ and a high-pot encapsulation isolation voltage capability of 2500V.
Absolute Maximum Ratings and Specifications
The document includes a comprehensive table detailing the absolute maximum ratings for the ZA Series, consisting of steady state and transient voltage ratings, peak pulse current capability (ranging from 50 to 6500A for 8/20us current wave), single pulse energy range (0.1 to 52J for 10/1000μs current wave), and operational temperature ranges.
Additionally, specifications at 25°C are provided for various attributes such as maximum continuous voltage, transient varistor voltage, clamping voltage, energy, and capacitance, across the different model sizes. These details give insight into the performance characteristics of each varistor under standard test conditions. The datasheet also features a “Ratings & Specifications” section where individual part numbers are matched with their respective voltage ratings and typical energy absorption capabilities. Specific notes indicate exemptions or additional considerations for certain parts.
Part Number and Branding
Part number and branding are clearly listed in a columnar format for easy reference, which corresponds to various model sizes and ratings. This facilitates the identification of the correct varistor based on specific application requirements. The datasheet concludes with a cautionary note that exceeding the listed absolute maximum ratings may cause irreversible damage to the device, emphasizing the importance of adhering to the provided specifications.
The datasheet finalized on December 12, 2018, mentions that specifications are subject to change without prior notice, which is a reminder for users to verify the most current datasheet before making design decisions or purchasing.
References:
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