Motorola Corporation

John E Salina

Clem H Brown

Horst A Gempe

A leadframe (10) architecture provides placement of multiple optocoupler pair devices (45, 50) in a minimum size footprint package. A detector flag (20) and LED flag (12) are placed on a common centerline (26) within the footprint. A critical length is determined for packaging factors lying along the centerline. The angle (28) formed between the centerline and the longitudinal axis (24) controls the optocoupler pair fit within the package. The angle (28) is calculated by taking the arc-sine function of the critical length divided by the footprint width.

Small outline optocoupler package method

An optocoupler package (40) has two pre-molded thermoplastic halves (42, 54); one containing the emitter (16) and the other containing the detector (18). The detector half (54) has a well (56) where the detector (54) is located. The well (56) is filled with silicon die coat gel (24). The emitter half (42) has a similar well (48) containing the emitter. Surrounding the well (48) of the emitter half is a protruding wall (50) with relief vents (52). The wall (50) is configured to fit into the perimeter of the well (56) of the detector package half (54). When the package (40) is assembled, the protruding wall (50) of the emitter half (42) is inserted into the well (56) of the detector package half (54), thereby displacing the gel (24) so as to completely fill the internal chamber (66) and spill into the relief vents (52).

Optocoupler package and method for making

Dual channel small outline optocoupler package and method thereof

A self biased isolated remote switch (11) for electrically isolating a switch (24) from a circuit (16). The circuit (16) is coupled to the primary side of the self biased isolated remote switch (11) while the switch is coupled to the secondary side. The secondary side does not need a power source, power is provided through non-electrical coupling from the primary side. The self biased isolated remote switch (11) comprises a first circuit (13) and a second circuit (14) both on the primary side, and a third circuit (12) on the secondary side. The first circuit (13) non-electrically couples to the third circuit (12) for providing power. The third circuit (12) non-electrically couples to the second circuit (14) for indicating when the switch (24) is closed.

Self biased electrically isolated remote switch powered by an optical or

An optocoupler package made up from a pre-assembled package having a leadframe, a voltage isolation barrier, and a body molded from a reflective plastic material. The voltage isolation barrier is fabricated as part of the body and positioned in such a way as to substantially increase the electrical flashover path between the optical source and the optical detector. An optical source mounted in the pre-assembled package subsequent to fabrication of the molded body. An optical detector is optically coupled to the optical source by reflection within the pre-assembled package, the optical detector being mounted in the pre-assembled package subsequent to fabrication of the molded body A reflective plastic cover is bonded to the pre-assembled package.

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Phoenix, AZ, United States of America

John E Salina