SMDJ85A-HRA Circuit Protection

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TVS - Diodes

Surge Protective Devices (SPDs) device plays an important role in protecting electronic systems from over voltage caused by lightning, electric wiring arcs, load switching noise, etc. TVS-Diodes (Transient Voltage Suppression Diodes) are a class of SPD which protect equipment from line voltage transients. SMDJ85A-HRA is a type of unidirectional TVS-Diode which is widely used in short surge protection of devices from lightning or related transients.

Application Field

SMDJ85A-HRA is used mainly to protect equipments in various industrial control fields such as automotive, electrical appliances, security, telecommunications, office automation and home networking. The key application fields include protection of power supply input, protection of peripheral signal transmission, protection of data interface and protection ofI/O interface.

Working Principle

TVS- diodes are constituted by a metal oxide varistor (MOV) and electrons. When transient surges enter the circuit, electrons will be generated rapidly with the turn on of the device , forming an electron waterfall which absorbs excessive energy and narrows the pulse width to protect the electronic equipment from damage. The SMDJ85A-HRA is designed to protect from voltage transient between -12V to -32V. It can withstand a current of up to 30A peak, clamping voltage of 33.4V and offers response at least within 0.15µs.

In summary, SMDJ85A-HRA is a unidirectional TVS-Diode which provides surge protection to electrical and electronic systems from transients caused due to lightning or load switching. The wide operating voltage range, low clamping voltage and fast response time makes the device an applicable choice for applications in various industries.

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