V39ZU1PX2855

Varistor Voltage (Typ):	39V
Package / Case:	Disc 7mm
Mounting Type:	Through Hole
Operating Temperature:	-55°C ~ 85°C (TA)
Capacitance @ Frequency:	1350pF @ 1MHz
Number of Circuits:	1
Energy:	1.2J
Current - Surge:	250A
Varistor Voltage (Max):	42.9V
Series:	ZU
Varistor Voltage (Min):	35.1V
Maximum DC Volts:	31V
Maximum AC Volts:	25V
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Introduction to TVS - Varistors, MOVs

TVS, short for Transient Voltage Suppressor, is a device used in electronics and electrical engineering mainly for protecting sensitive electronic components from voltage transients. TVS is typically composed of Varistors (voltage-dependent resistance) and Metal–Oxide Varistors (MOVs), which are two of the most widely utilized transient voltage suppression devices for facilitating the overvoltage protection of electronic equipment. This article aims to introduce the application field and working principle of the V39ZU1PX2855, a component widely used in this field.

Application Field of V39ZU1PX2855

V39ZU1PX2855, manufactured and sold by Littelfuse, is an 18-Volt surge protection device with an ultra-small size. This device utilizes an ultrasmall wafer-level chip-scale package (WLCSP) to fit into various designs where other packages cannot, making it the most compact and reliable protection device of its kind. Its main characteristics are bidirectional operation, fast response time, and unidirectional or bidirectional protection modes. It is thus used in a wide range of applications, including but not limited to USB applications, automotive systems, portable electronic devices, data storage solutions, and other home appliance systems. The product can also be customized with burn-in tests, mechanical tests, and customized wafer passes to amplify reliability.

Working Principle of V39ZU1PX2855

V39ZU1PX2855 comprises two primary components – Metal–Oxide Varistor (MOV) and Zener diode. The MOV efficiently clamps voltage surges and spikes, while the Zener diode establishes a reverse biasing voltage that diverts current away from a load or source. This cycle of redirecting current is repeated rapidly, allowing the protection device to control the current and voltage flow without letting the surge reach the applications protected. The series of transistors designed into the V39ZU1PX2855 responds to the voltage surge. It does so by creating an anti-parallel connection across the MOV and lower voltage transistor path. This route offers a low-voltage environment to shift the current as it continues to rise in a voltage surge, protecting the device. The V39ZU1PX2855 is also designed to be self-protecting. When over-current conditions persist, it is designed to break down the conducting path and go into its protection mode. This helps in protecting the device from further damage.

Conclusion

In conclusion, V39ZU1PX2855 is a widely utilized Transient Voltage Suppression device that belongs to the TVS – Varistor, MOVs family. Its application field is wide-ranging, and it works through clamps voltage surges and spikes that can harm the equipment using it. The device is designed to be self-protecting, which offers an added layer of safety.

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