Abstract: A substrate structure includes a substrate body, at least one first mold area and at least one second mold area. The substrate body has a first surface and a second surface opposite to the first surface, and defines at least one first through hole extending through the substrate body. The first mold area is disposed on the first surface of the substrate body. The second mold area is disposed on the second surface of the substrate body, wherein the first mold area is in communication with the second mold area through the first through hole.

Abstract: A substrate structure includes a substrate body, at least one first mold area and at least one second mold area. The substrate body has a first surface and a second surface opposite to the first surface, and defines at least one first through hole extending through the substrate body. The first mold area is disposed on the first surface of the substrate body. The second mold area is disposed on the second surface of the substrate body, wherein the first mold area is in communication with the second mold area through the first through hole.

Abstract: A clock down sensor mainly comprises a converter and a low-pass filter. The converter is used to convert an input signal from a PECL (Positive Emitter Coupling Logic) signal to a TTL (Transistor Transistor Logic) signal, the low pass filter is used to obtain a DC (Direct Current) level of the TTL signal. Thereby, the sensor can judge whether the clock signal is terminated according to the potential of the output signal in order to emit a warning so that a breakdown elimination inquiry can be done or automatic breakdown elimination can be processed earlier.