Overview
The MC7818CT is a monolithic integrated circuit designed as a fixed-voltage regulator, produced by onsemi. This device is part of the 78XX series, which is widely used for local, on-card regulation in various electronic systems. The MC7818CT is specifically designed to provide a stable output voltage of 18 volts and can deliver output currents in excess of 1.0 A with adequate heatsinking.
These regulators feature internal current limiting, thermal shutdown, and safe-area compensation, making them reliable and robust for a variety of applications. They are available in several package types, including surface mount D2PAK-3, DPAK-3, and standard 3-lead transistor packages.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Output Voltage (TJ = 25°C) | VO | 17.3 | 18 | 18.7 | Vdc |
| Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PD ≤ 15 W) | VO | 17.1 | 18 | 18.9 | Vdc |
| Input Voltage Range | VI | 20.5 | - | 35 | Vdc |
| Peak Output Current (TJ = 25°C) | Imax | - | - | 2.2 | A |
| Line Regulation (TJ = 25°C) | Regline | - | - | 0.8 | mV |
| Load Regulation (TJ = 25°C) | Regload | - | - | 1.3 | mV |
| Quiescent Current | IB | 3.3 | 6.0 | - | mA |
| Short Circuit Current Limit (TA = 25°C) | ISC | - | - | 0.2 | A |
| Thermal Resistance, Junction-to-Ambient | RJA | - | - | 65 | °C/W |
Key Features
- Output current in excess of 1.0 A with adequate heatsinking.
- No external components required for operation.
- Internal thermal overload protection and short circuit current limiting.
- Output transistor safe-area compensation.
- Output voltage offered in 1.5%, 2%, and 4% tolerance.
- Available in surface mount D2PAK-3, DPAK-3, and standard 3-lead transistor packages.
- AEC-Q100 qualified and PPAP capable for automotive and other critical applications.
Applications
- Local, on-card voltage regulation in electronic systems.
- Power supplies for industrial, automotive, and consumer electronics.
- Adjustable voltage and current regulation with external components.
- Systems requiring high current and stable voltage output.
Q & A
- What is the output voltage of the MC7818CT?
The output voltage of the MC7818CT is 18 volts, with a tolerance range of 17.3 to 18.7 volts at TJ = 25°C.
- What is the maximum output current of the MC7818CT?
The MC7818CT can deliver an output current in excess of 1.0 A with adequate heatsinking.
- What are the key protection features of the MC7818CT?
The MC7818CT features internal thermal overload protection and short circuit current limiting.
- What are the available package types for the MC7818CT?
The MC7818CT is available in surface mount D2PAK-3, DPAK-3, and standard 3-lead transistor packages.
- Is the MC7818CT suitable for automotive applications?
Yes, the MC7818CT is AEC-Q100 qualified and PPAP capable, making it suitable for automotive and other critical applications.
- What is the thermal resistance of the MC7818CT?
The thermal resistance, junction-to-ambient (RJA), of the MC7818CT is 65 °C/W.
- Can the MC7818CT be used for adjustable voltage regulation?
Yes, the MC7818CT can be used with external components to obtain adjustable voltages and currents.
- What is the quiescent current of the MC7818CT?
The quiescent current of the MC7818CT ranges from 3.3 to 6.0 mA.
- How does the MC7818CT handle short circuit conditions?
The MC7818CT has an internal short circuit current limit of 0.2 A at TA = 25°C.
- What is the line regulation of the MC7818CT?
The line regulation of the MC7818CT is typically 0.8 mV.
