Method for forming electrostatic discharge protection device for

Details Method for forming electrostatic discharge protection device for Method for forming electrostatic discharge protection device for

1995-06-06

1997-10-14

Tsai, Jey

Fishing, trapping, and vermin destroying

437 51, 437170, 437904, H01L 2104

Patent

active

056772050

ABSTRACT:
An electrostatic discharge (ESD) device includes a pair of depletion mode MOSFETs connected drain-to-drain in a series path between an input terminal and an output terminal, the gate of each MOSFET being connected to its source. A first diode having a relatively high breakdown voltage is connected between ground and the common drain terminal of the MOSFETs, and a second diode having a relatively low breakdown voltage is connected between ground and the output terminal of the device. The second diode breaks down during a relatively low, long-lived voltage spike (in an automobile, sometimes referred to as a "load dump"), while the second MOSFET saturates, limiting the size of the current through the second diode. The first diode breaks down during a large voltage spike of short duration, such as occurs from an ESD.

REFERENCES:
patent: 4912745 (1990-03-01), Fitzpatrick et al.
patent: 5060037 (1991-10-01), Roundtree
patent: 5246872 (1993-09-01), Mortensen
patent: 5366908 (1994-11-01), Pelella
Radio Fernsehen Elektronik, vol. 42, No. 2, 1 Feb. 1993, p. 61 XP 000407295 `Announcement`.

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