As the most classic model of a linear voltage regulator, the 78 series serves in various situations that require a fixed voltage output. Regarding the 78 series, Jiangsu Changjing Electronics Technology Co., Ltd.(JSCJ) provides multiple voltages and packaging solutions. This article will help you understand the CJ78 series.
Linear Regulators and 78 Series
A linear regulator, a frequently utilized power supply IC, can be adjusted via its internal adjustment tube. So, the linear voltage regulator can stably output a fixed voltage when the input voltage changes to a certain extent. The internal regulator tube uses a transistor or FET. As a very classic model of a linear voltage regulator, the internal adjustment tube of the 78 series uses transistors. It has a simple structure and is easy to use. It can provide stable output power without additional peripheral components, which increases the PCB space usage efficiency and reduces product production costs. Therefore, the 78 series serves on various occasions.
Specifications of CJ78 Series
CJ78 series (CJ78XX) is a set of three-terminal positive voltage linear regulators with fixed output voltage. It has multiple fixed output voltages. With good heat dissipation, the CJ78 series (CJ78XX) can provide an output current of up to 1.5A. It integrates short-circuit, current limit, and overheating protection inside its chip, which makes the voltage regulator relatively hard to damage. In addition to being used as fixed voltage regulators, the CJ78 series (CJ78XX) can be used with external components to obtain adjustable output voltage and current. Table 1 shows the specifications of the CJ78 series (CJ78XX).
In addition to the CJ78XX series, it also provides a range of solutions for the CJ78MXX series and CJ78LXX series with different load capacities to meet the differentiated needs of customers.
| Table 1：Typical Specifications of CJ78 Series(Ta=25℃)[1] | |||
| CJ78 series | CJ78XX | CJ78MXX | CJ78LXX |
| Vin | 35V | 35V | 30V, 35V[2] |
| Iout | 1.5A | 0.5A | 0.1A |
| Tj Max | 150℃ | 150℃ | 150℃ |
| Tj OPR | -40~125℃ | -40~125℃ | -40~125℃ |
[1]: The table data is for reference only. For actual parameters, please refer to the product official data sheet.
[2]: The maximum input voltage of the CJ78LXX series is 30V when the output voltage point is less than or equal to 10V, and 35V when it is greater than 10V.
Figure 1 Typical application circuit diagram of CJ78 series
Solution Selection for CJ78 Series
CJ78 series (CJ78XX, CJ78MXX, and CJ78LXX) provide a range of voltage points and solutions. Table 2 shows the output voltage and package forms of the CJ78 series.
| Table 2：CJ78 Series Output Voltage and Packaging Form | |||
| CJ78 series | Output Voltage | Accuracy | All Available Packages[3] |
| CJ78XX | 5V, 6V, 8V, 9V, 12V | 3% | TO-251S, TO-251-3L TO-220F, TO-220-3L TO-252-2L, TO-263-2L |
| CJ78MXX | 5V, 6V, 8V, 9V, 12V, 15V |
3% | TO-251, TO-251S TO-220-3L, TO-252-2L |
| CJ78LXX | 5V, 6V, 8V, 9V 12V, 15V, 18V |
3% | TO-92, SOT-23-3L, SOT-89-3L |
[3]: List all available package forms of the series.
Advantages of CJ78 Series
As one of the primary products of Power IC, after years of market accumulation, the CJ78 series has formed its series of advantages, mainly including the following:
-
Product Quality Is Reliable
The CJ78 series products integrate short-circuit, current limiting, and overheating protection. At the same time, the CJ78 series has sufficient product margin, which makes the CJ78 series very durable in most applications. In addition, after proper consideration and design, the CJ78 series can protect itself and other circuit parts.
-
The Product Is Cost-effective
CJ78 series relies on its internationally leading packaging capabilities to ensure product quality while providing customers with market-competitive finished product prices, helping customers better manage and control the costs of the product production process.
-
Product Is Widely Used
The CJ78 series is easy to use. Circuit designers use it in various types of circuit designs. Its most widespread use is to use the CJ78 series as a DC-regulated power supply to power types of MCUs. That makes the CJ78 series applicable to various applications, such as large appliances such as air conditioners and TVs, small household appliances such as massagers and power tools, and power supplies such as batteries and charging piles.
-
The Product Is Proven
The CJ78 series has a long production history. It maintains cooperative relationships with some well-known power supply companies in the industry. Over the years, the CJ78 series has gained recognition from many customers and maintained a certain proportion of market share.
About Jiangsu Changjing Electronics
Established in November 2018, Jiangsu Changjing Electronics Technology Co., Ltd.(JSCJ) is an enterprise specializing in semiconductor products.
JSCJ has wafers, discrete devices, and power management ICs. The product range is diverse and complete. Its diodes, bipolar transistors, and MOSFETs hold a prime position in the domestic market. The power management ICs represented by LDO, DC-DC, lithium battery protection, and other ICs have also reached the domestic mainstream level.
