SMDC125F/33-2 Circuit Protection

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PTC (positive temperature coefficient) resettable fuses are a type of circuit protection device that replaces traditional fuses with an electronic reset circuit to provide circuit protection. The SMDC125F/33-2 is a type of PTC resettable fuse designed to protect sensitive electronic components from collateral damage due to overloads or short circuits.

The SMDC125F/33-2 resettable fuse consists of a PTC element and a power transistor to provide over-current protection and reset. The PTC element is a disc-shaped ceramic material that is connected in series with the circuit and has a positive temperature coefficient, which means that its resistance increases with increasing temperature. This creates a self-regulating circuit that limits current to safe levels and also provides over-current protection. The power transistor acts as an amplifier, allowing the PTC element to open and close the circuit with a relatively low current.

The SMDC125F/33-2 has a rated voltage of 125V and a rated current of 33 Amps. The fuse features a wide temperature range of -55°C to +125°C, and a reset temperature range of >20°C to <160°C. The fuse is available in various package sizes, including SMD (surface mount devices) and through-hole packages.

One of the main advantages of using a PTC resettable fuse is that the protection circuit does not require frequent service or maintenance to remain functioning properly. The SMDC125F/33-2 has a fast trip time of <150ms and a fast reset time of <500ms, which ensures that the circuit is reset quickly after an over-current condition has been detected.

Another advantage of the SMDC125F/33-2 over traditional fuses is its compact size. It is a surface-mount device (SMD) that is designed to fit in tight places, making it ideal for protection in a variety of situations where space is limited.

The SMDC125F/33-2 is suitable for use in a variety of electronics applications, including LED drivers, power supplies, computers, laptops, and game consoles. It can also be used to protect circuit boards in medical and military equipment.

In summary, the SMDC125F/33-2 is a type of PTC resettable fuse designed to provide circuit protection. It has a wide temperature range and fast trip and reset times, and can be used in a variety of applications. The fuse’s small size makes it ideal for applications where space is limited.

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