BU7251G-TR

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Linear Comparators are widely used circuits in the field of analog electronics, ranging from power supplies to temperature sensors. The BU7251G-TR, from Rohm Semiconductor, is an example of a Linear Comparator from their advanced series, designed for high-performance applications.

The BU7251G-TR is a dual NPN (negative-positive-negative) type Bipolar Transistor comparator with open-drain output. It includes two transistor-transistor logic (TTL) compatible open-drain outputs and are capable of driving large loads. This makes it suitable for driving two-wire interface busses, as well as complex logic circuits.

The maximum supply voltage is +20V while the minimum is -3V. Per the datasheet, the recommended input voltage range is 0 to +2.7V. The recommended operating temperature range is -40°C to +85°C. The power consumption is 36mW with the output high and 22mW with the output low, making it one of the more energy efficient comparators on the market.

The BU7251G-TR has a wide range of applications. It can be used as a temperature sensor, a voltage-level detector, or as an output amplifier for precision heavy-duty current switching applications. It can also be used as a logic comparator in analog-to-digital converters, or in frequency selectors as a noise mixer. Additionally, it can be used in audio circuits, such as a microphone preamplifier or a DJ mixer.

Regarding the working principle of the BU7251G-TR, the device is based around a few key components. Firstly, it has two multi-gate transistors, which act as a balanced, dual-channel switch. Secondly, it has two resistors, which are used to accurately set the trigger points. Lastly, it has an open-drain output transistor, which acts as the output driver.

When operated, the BU7251G-TR compares the incoming voltage with the voltage set on the resistors. If the incoming voltage is greater than the threshold voltage on the resistors, the output will be set to ‘high’. If the incoming voltage is smaller than the threshold voltage, the output will be set to ‘low’.

The BU7251G-TR is not only power efficient but also highly reliable. Its high-speed operation, low power consumption and robust output transistors makes it suitable for a wide range of analog applications. Its dual-channel design makes it an ideal choice for systems that require multiple input channels and/or multiple outputs. Furthermore, its surface-mount design also makes it easy to install in various types of equipment.

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