1. "OEM trimmer packaging solutions" is a Chinese term, meaning that the resistance value changes with the voltage within a certain current and voltage range, or that the resistance value is sensitive to the voltage. The corresponding English name is "Voltage Dependent Resistor", abbreviated as "VDR".

The resistive body material of the OEM trimmer packaging solutions is semiconductor, so it is a type of semiconductor resistor. Currently, the widely used zinc oxide (ZnO) OEM trimmer packaging solutions are mainly composed of divalent element (Zn) and hexavalent element oxygen (O). Therefore, from the material perspective, zinc oxide OEM trimmer packaging solutions is a "II-VI group oxide semiconductor".

The OEM trimmer packaging solutions are named according to their functions, and are called surge absorbers. Sometimes, OEM trimmer packaging solutions are also referred to as "electrical shock (surge) suppressors (absorbers)" based on their functions.

2. The "safety valve" function of OEM trimmer packaging solutions

What are the uses of OEM trimmer packaging solutions? The feature of OEM trimmer packaging solutions is that when the voltage applied to it is lower than its threshold, the current flowing through it is very small, similar to a closed valve. When the voltage exceeds UN, the current flowing through it surges, similar to an open valve. By taking advantage of this function, abnormal overvoltages that often occur in the circuit can be suppressed, protecting the circuit from damage caused by overvoltage.

3. Application Type

In different application scenarios, the purpose of using OEM trimmer packaging solutions, and the voltage/current stress applied to OEM trimmer packaging solutions are not the same.

Therefore, the requirements for OEM trimmer packaging solutions vary. It is important to distinguish these differences, as they are crucial for correct usage.

Depending on the purpose of use, OEM trimmer packaging solutions can be divided into two major categories: ① protective OEM trimmer packaging solutions, ② circuit-functional OEM trimmer packaging solutions.

3.1 Protection using OEM trimmer packaging solutions

(1) For power supply protection purposes or for signal lines and data lines, OEM trimmer packaging solutions are used. These solutions need to meet the requirements of different technical standards.

(2) Depending on the continuous working voltage applied to the OEM trimmer packaging solutions, these solutions can be classified into two types: AC or DC. The aging characteristics of the OEM trimmer packaging solutions under these two voltage stresses are different.

(3) Depending on the different abnormal overvoltage characteristics that the OEM trimmer packaging solutions can withstand, the OEM trimmer packaging solutions can be classified into three types: surge suppression type, high power type, and others.

★ Surge Suppression Type: This refers to OEM trimmer packaging solutions designed to suppress transient overvoltages such as lightning overvoltage and operational overvoltage. These transient overvoltages occur randomly and non-periodically, and the peak values of current and voltage can be very high. The vast majority of OEM trimmer packaging solutions fall into this category.

★High-power type: Refers to OEM trimmer packaging solutions used to absorb continuous pulse groups that occur periodically. For example, OEM trimmer packaging solutions connected in parallel to the switching power converter. Here, the shock voltage occurs periodically and the period is known. The energy value can generally be calculated. The peak voltage is not very high, but due to the high frequency of occurrence, the average power is quite large.

★High-energy type: Refers to the pressure-sensitive voltage devices used to absorb the magnetic energy in large inductive coils such as generator excitation coils and lifting electromagnet coils. For such applications, the main technical parameter is the energy absorption capacity.

The protective function of OEM trimmer packaging solutions can be repeatedly activated in most application scenarios. However, sometimes it is also designed as a one-time protective device like an electrical fuse. For example, an OEM trimmer packaging solution with a short-circuit contact is connected in parallel to the load of certain current transformers.

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