MCP1322T-31LE/OT

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The MCP1322T-31LE/OT is part of a family of polymeric PTC resettable fuses from Microchip Technology, Inc. It’s a device intended for use as a resettable fuse in a range of scenarios and applications, commonly grouped in the PMIC (Power Management IC) Supervisors category. It provides superior protection in the event of over-current or abnormal current conditions and allows equipment to safely shut down and recover from such events. Its small size, low power usage and simple design make it an ideal solution for a variety of types of applications and is suitable for a range of operating temperatures.

The MCP1322T-31LE/OT has a fixed time delay and a trip setting of 0.032/0.110 Ohms with trip current at 0.693/1.472 A, respectively. It attaches to a ground surface on the board and is triggered in response to is increases in current, delivering an over-voltage safety shut down. The device consists of a control transistor, a short wavelength photo diode, and a serial TTL logic output which is consistent while the input current is within the device’s rated current range. When the current drops, the device turns off, allowing normal operation to resume. This allows for a simpler circuit design and improved system reliability as the fuse will reset itself in such an event.

The MCP1322T-31LE/OT is primarily used in applications requiring enhanced protection from hazardous over-current events, and offers improved circuit protection with lower power usage and a much smaller physical size than traditional fuses. It is ideal for use in a range of equipment including power supplies and voltage regulators, industrial machinery, and domestic appliance such as portable electronics, data centers and audio/video equipment.

The MCP1322T-31LE/OT also boasts a logarithmic output voltage vs current curve which is especially suitable in applications that require threshold detection. A wide range of temperature and current environments can be accommodated while still ensuring the correct operation of the device. Ultra-low power consumption is featured as well, making it an ideal choice for use in battery powered applications.

The working principle of the MCP1322T-31LE/OT is fairly simple and revolves around the use of a polymeric PTC fuse. In normal operation current is supplied through the device and across the series of resistor elements. However, when the device’s rated current level is exceeded, the current causes the resistor elements to heat up to a temperature where it will expand and cause a mechanical rupture in the wire. This interrupts the circuit and also causes the latch circuit to remain in the tripped state until the power is removed. This is the primary reason why the device is so often used in system protection, as it eliminates the need for manual resetting of the device after each incident.

The MCP1322T-31LE/OT is an important component in the PMIC Supervisors category and is used in a range of applications to provide over-current protection. Its low power usage and compact size make it a great choice for many types of systems, while its easy to use working principle and logarithmic output voltage vs current curve make it well-suited for threshold detection. It is also capable of operating in a range of temperature and current environments, making it a great addition to any system requiring additional protection from hazardous current conditions.

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