Overview
The MC78M08BDT is a 500 mA positive voltage regulator from Onsemi, part of the MC78M00/MC78M00A series. This device is designed for local, on-card voltage regulation and is identical to the popular MC7800 series but specified for half the output current. It features internal current limiting, thermal shutdown circuitry, and safe-area compensation for the internal pass transistor, making it robust under various operating conditions.
Key Specifications
| Characteristics | Symbol | Min | Max | Unit | |
|---|---|---|---|---|---|
| Output Voltage (TJ = 25°C) | VO | 7.70 | 8.0 | 8.30 | Vdc |
| Output Voltage Variation (10.5 Vdc ≤ VI ≤ 23 Vdc, 5.0 mA ≤ IO ≤ 350 mA) | VO | 7.6 | - | 8.4 | Vdc |
| Line Regulation (TJ = 25°C, 10.5 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA) | Regline | - | 6.0 | 50 | mV |
| Load Regulation (TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) | Regload | - | - | 25 | mV |
| Input Bias Current (TJ = 25°C) | IIB | - | 3.2 | 6.0 | mA |
| Dropout Voltage (TJ = 25°C) | VI−VO | - | 2.0 | - | Vdc |
| Short Circuit Current Limit (TJ = 25°C) | IOS | - | 350 | - | mA |
| Peak Output Current (TJ = 25°C) | IO | - | 700 | - | mA |
Key Features
- No External Components Required
- Internal Thermal Overload Protection
- Internal Short Circuit Current Limiting
- Output Transistor Safe-Area Compensation
- High Accuracy (±2%) Available for Certain Models (e.g., 5.0 V, 8.0 V, 12 V, 15 V)
- Pb-Free Packages Available
Applications
The MC78M08BDT is suitable for various applications requiring local voltage regulation, including:
- On-card voltage regulation in electronic devices
- Power supplies for embedded systems
- Industrial control systems
- Consumer electronics
- Automotive electronics
Q & A
- What is the maximum output current of the MC78M08BDT?
The maximum output current is 500 mA with adequate heatsinking.
- What is the output voltage range for the MC78M08BDT?
The output voltage range is 7.70 V to 8.30 V at TJ = 25°C.
- Does the MC78M08BDT have internal thermal protection?
Yes, it features internal thermal overload protection.
- What is the dropout voltage for the MC78M08BDT?
The dropout voltage is 2.0 V at TJ = 25°C.
- Is the MC78M08BDT available in Pb-free packages?
Yes, Pb-free packages are available.
- What is the operating temperature range for the MC78M08BDT?
The operating temperature range is from -40°C to +125°C.
- Does the MC78M08BDT require external components for operation?
No, it does not require external components for operation.
- What is the short circuit current limit for the MC78M08BDT?
The short circuit current limit is 350 mA at TJ = 25°C.
- What is the peak output current for the MC78M08BDT?
The peak output current is 700 mA at TJ = 25°C.
- What is the line regulation for the MC78M08BDT?
The line regulation is 6.0 mV (typical) from 10.5 Vdc to 25 Vdc at IO = 200 mA.
