Resistance - Initial (Ri) (Min):	1.5 Ohms
Approvals:	--
Lead Spacing:	--
Thickness (Max):	0.027" (0.68mm)
Height - Seated (Max):	--
Size / Dimension:	0.083" L x 0.055" W (2.10mm x 1.40mm)
Package / Case:	0805 (2012 Metric)
Mounting Type:	Surface Mount
Ratings:	PS300, PS400
Operating Temperature:	--
Resistance - Post Trip (R1) (Max):	9 Ohms
Series:	PolySwitch®, picoASMDC
Time to Trip:	100ms
Current - Trip (It):	300mA
Current - Hold (Ih) (Max):	120mA
Current - Max:	20A
Voltage - Max:	15V
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Introduction

PTC Resettable Fuses have been used for a number of years in a wide variety of applications, providing a means of preventing catastrophic current overloads to a system. A PTC Resettable Fuse is a two-component thermally sensitive device, typically made up of a current-limiting fuse and a Polymeric Positive Temperature Coefficient resistor (PPTC). When a device is subject to an overload, the PPTC resistor element starts to heat up and begins to increase resistance until the current drops to a safe level. As the PPTC element cools the resistance reduces and the device will reset. The PICOASMDC012S-2 is a PTC Resettable Fuse, designed to provide efficient over-current protection in a range of applications. The device is designed to suppress current in the range of 0.2 A to 10 A with a wide-range of temperature and voltage specifications.

Application Areas for the PICOASMDC012S-2

The PICOASMDC012S-2 is a PTC Resettable Fuse, which can provide protection against a wide variety of applications. It is used in a range of applications including:

• Wireless chargers
• USB devices
• Solar Battery Chargers
• Propulsion systems
• Power Supplies
• Automotive electronic protection
• Telecommunications systems
• Consumer electronics

The device is designed for use in a range of conditions, including temperatures of −55 °C to +125 °C, making it suitable for a number of applications. The unique design of the device allows for different voltage and current specifications to be set, meaning the device can be tailored to meet the requirements of the user.

Working Principle of the PICOASMDC012S-2

The PICOASMDC012S-2 incorporates a current-limiting fuse and a PPTC element. When the device is subject to an overload, the PPTC element will heat up, increasing its resistance until the current drops to a safe level. As the PPTC element cools its resistance decreases, allowing the device to reset. The device is designed to auto reset at predetermined temperature, which is adjustable by means of an external resistor. The PPTC element is made up of a metal base containing two carbon beads. The beads are molded with a conductive elastomer material. If the device is subject to an overload, the temperature of the beads will rise above a certain thereshold value. As this value is reached the conductive material will begin to melt, disconnecting the beads from the metal base. This disconnection will increase the resistance, limiting the amount of current that can flow. Once the temperature of the beads drops below the pre-set value, the conductive material will re-connect the beads to the metal base, allowing the device to reset.

Conclusion

The PICOASMDC012S-2 is a highly versatile device, which combines a current-limiting fuse with a PPTC element, providing over-current protection in a range of settings. The adjustable temperature threshold allows the device to be tailored to provide protection for a variety of loads.

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