Overview
The STMicroelectronics L6221AD is a monolithic quad Darlington switch designed for high current, high voltage switching applications. This component is part of the L6221 series and is specifically configured as a quad NPN Darlington transistor array. It is packaged in a 20-pin SO (Small Outline) package, making it suitable for surface mount technology (SMT) applications. Although it is noted as an obsolete component, it remains relevant for legacy systems and specific design requirements.
Key Specifications
| Parameter | Value |
|---|---|
| Configuration | Quad Transistor |
| Polarity | NPN |
| Collector-Emitter Voltage (VCEO Max) | 46 V |
| Maximum DC Collector Current | 1.8 A |
| Mounting Style | SMD/SMT |
| Package Type | 20-SO |
| Power Dissipation (Max) | 1 W |
Key Features
- High current and high voltage switching capabilities, making it suitable for demanding applications.
- Quad Darlington configuration, providing high current gain and low input current requirements.
- Surface mount package (20-SO) for compact and efficient board design.
- High collector-emitter voltage (VCEO) of 46 V, ensuring robust performance in high-voltage environments.
Applications
The L6221AD is designed for various high current, high voltage switching applications. These include but are not limited to:
- Power supplies and DC-DC converters.
- Motor control and drive systems.
- Relay and solenoid drivers.
- High-power audio amplifiers.
- Industrial control systems.
Q & A
- What is the L6221AD? The L6221AD is a monolithic quad Darlington switch from STMicroelectronics, designed for high current, high voltage switching applications.
- What is the package type of the L6221AD? The L6221AD is packaged in a 20-pin SO (Small Outline) package.
- What is the maximum collector-emitter voltage (VCEO) of the L6221AD? The maximum collector-emitter voltage (VCEO) is 46 V.
- What is the maximum DC collector current of the L6221AD? The maximum DC collector current is 1.8 A.
- Is the L6221AD suitable for surface mount technology (SMT)? Yes, it is designed for SMT applications.
- What are some common applications of the L6221AD? Common applications include power supplies, motor control systems, relay and solenoid drivers, high-power audio amplifiers, and industrial control systems.
- Is the L6221AD still in production? The L6221AD is noted as an obsolete component, but it may still be available from some suppliers for legacy systems.
- What is the power dissipation rating of the L6221AD? The maximum power dissipation is 1 W.
- Why is the L6221AD used in high-voltage applications? It is used due to its high collector-emitter voltage rating and high current handling capabilities.
- What is the polarity of the transistors in the L6221AD? The transistors in the L6221AD are NPN.
