95-1a International Rectifier Kansas Street, Segundo, 90245

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95-1a International Rectifier Kansas Street, Segundo, 90245

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Here information PVT412L microelectronic relay (MER) will save time money while improving performance reliability FAX/Modem designs. Figure schematic basic modem showing mechanical relay. equivalent hook-switch traditional telephone this case, either electromechanical relay (EMR) reed relay. Because such relays inherently cause contact bounce upon contact closure, debouncing circuitry
95-1a
International Rectifier Kansas Street, Segundo, 90245
REPLACING MECHANICAL RELAYS WITH IR'S PVT412L MICROELECTRONIC RELAY FAX/MODEM DESIGNS
Andy Serkuczewski required. While resistor small inexpensive, capacitor both bulky expensive. Additionally, there fusible resistors series with Ring lines that required this circuitry pass FCC's Part lightning surge test 1000-volt, 200-Amp short-duration pulse. Without these resistors relay would almost certainly destroyed contact welding during such surge.
0.005µF/1kV
fusible Varistor Telephone Company Network
6.8V
Relay
0.47µF/250V
Figure Basic Modem Using Mechanical
95-1a
When electromechanical reed relay replaced with PVT412L MER, Figure following cost space savings realized. debouncing circuitry longer needed. Solid-state switching bounce-free because there physical parts making breaking contact. fusible resistors longer required thanks internal active, current-limiting feature PVT412L. Even more important than savings space cost, should both fusible
resistors fuse open lightening surge, modem would fail require costly repair replacement. This situation avoided using PVT412L place electromechanical reed relay. initial cost differential approximately between PVT412L typical high volume pricing) will more than offset reduction component count resis tors, capacitor) savings printed circuit board real estate elimination costly failures lightening surges.
Telephone Company Network
6.8V
Relay
Varistor
0.47µF/250V
Figure Basic Modem Using IR's Solid-State PVT412L
WORLD HEADQUARTERS: Kansas St., Segundo, California 90245 Tel: (310) 252-7105 http://www.irf.com/ Data specifications subject change without notice. 2/26/2002
www.irf.com

95-1a International Rectifier Kansas Street, Segundo, 90245

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