The SMDJ30A with TVS SMC (DO-214AB) RoHS is a Bi-directional Transient Voltage Suppressor from Yenji. It is made of a glass passivated junction, and is designed to protect low power circuits against excessive voltage spikes. It is RoHS compliant and can be used in a variety of applications including telecom, aviation, and in automotive products. It has a maximum ist operating voltage of 30Vdc, a peak pulse power of 600 Bytes, a clamping voltage of 37V, and a breakdown voltage of 18V. It is rated to operate between -65°C to +175°C.