7818 is a 18V Voltage Regulator that restricts the voltage output to 18V and draws 18V regulated power supply to provides a convenient power source for most TTL components.
Voltage regulators are very common in electronic circuits. They provide a constant output voltage for a varied input voltage. In our case, the 7818 IC is an iconic regulator IC that finds its application in most of the projects. The name 7818 signifies two meaning, “78” means that it is a positive voltage regulator and “18” means that it provides 18V as output. So our 7818 will provide a +18V output voltage.
The output current of this IC can go up to 1.5A. But, the IC suffers from heavy heat loss hence a Heatsink is recommended for projects that consume more current. For example, if the input voltage is 15V and you are consuming 1A, then (15-9) * 1 = 6W. This 6 Watts will be dissipated as heat.
Features
- Fixed 18V voltage regulators
- Thermal overload protection
- Short circuit protection
- Output transition SOA protection
Pin Description :
| Pin Number | Pin Name | Description |
| 1 | Input (V+) | Unregulated Input Voltage |
| 2 | Ground (Gnd) | Connected it to Ground |
| 3 | Output (Vo) | Outputs Regulated +18V |
Specifications
| Product Attribute | Attribute Value |
| Product Category: | Linear Voltage Regulators |
| Mounting Style: | Through Hole |
| Package/Case: | TO-220 |
| Number of Outputs: | 1 Output |
| Polarity: | Positive |
| Output Voltage: | 18 V |
| Output Current: | 1.5 A |
| Output Type: | Fixed |
| Input Voltage, Min: | 20 V |
| Input Voltage, Max: | 35 V |
| Minimum Operating Temperature: | 0 C |
| Maximum Operating Temperature: | + 125 C |
| Load Regulation: | 360 mV |
| Line Regulation: | 360 mV |
| Quiescent Current: | 4.4 mA |
| Series: | L78 |
| Packaging: | Tube |
| PSRR / Ripple Rejection – Typ: | 53 dB |
Applications
- Circuits requiring steady 18v supply
- Protection for devices having specific voltage sensitivity
- DIY projects requiring specific voltage from an existing higher/ varying voltage supply
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