Motorola Corporation

James G Lippmann

Hiep M Le

Lonne L Mays

Jean-Baptiste Martin

William D Wasmer

Peter J Gillespie

A semiconductor diode device (10) includes two heatsinks (11, 12), a semiconductor substrate (15) having a p-n junction (35) and located between the two heatsinks (11, 12), solder (13, 14) between the heatsinks (11, 12) and the semiconductor substrate (15), and a packaging material (16) covering the semiconductor substrate (15), the solder (13, 14), and a portion of the two heatsinks (11, 12). The two heatsinks (11, 12) each have a curved surface (21, 22), which reduces tilting of the semiconductor substrate (15), reduces temperature gradients across surfaces (23, 24) of the semiconductor substrate (15), and improves the reliability of the semiconductor diode device (10). The two heatsinks (11, 12) also include protrusions (19, 20), which help to keep the packaging material (16) covering the curved surfaces (21, 22) of the heatsinks (11, 12).

Semiconductor diode device with non-planar heatsink and method of

A rectifier (60) is formedf by soldering a diode chip (66) in a cavity (64) in a metal base (62) having a metal sidewall (69), soldering the head (72) of an axial lead (70) to the chip (66), and filling the cavity (64) with an encapsulation (88). An outward leaning partition (80) is provided in the cavity (64) around and at about the same elevation as the chip (66). The encapsulation (88) covers the lead head (72) and the partition (80), and fills the space between the partition (80) and the base sidewall (69). This locks all the parts together, giving improved reliability and lead stiffnes at low cost.

Growing community of inventors

Mesa, AZ, United States of America

James G Lippmann