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SMDA15LC Datasheet(PDF) 4 Page - Protek Devices |
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SMDA15LC Datasheet(HTML) 4 Page - Protek Devices |
4 / 5 page 4 www.protekdevices.com 05074.R6 4/05 SMDA03LC thru SMDA24LCC APPLICATION NOTE The SMDAxxLC & SMDAxxLCC Series are TVS arrays designed to protect I/O or data lines from the damaging effects of ESD, EFT and other types of surges. This product series provides both unidirectional and bidirectional protection, with a surge capability of 500 Watts P PP per line for an 8/20µs waveform and ESD protection > 40kV. UNIDIRECTIONAL COMMON-MODE CONFIGURATION(Figure 1) The SMDAxxLC Series provides up to four (4) lines of protection in a common-mode configuration as depicted in Figure 1. Circuit connectivity is as follows: ✔ Line 1 is connected to Pin 5. ✔ Line 2 is connected to Pin 6. ✔ Line 3 is connected to Pin 7. ✔ Line 4 is connected to Pin 8. ✔ Pins 1-4 are connected to ground. BIDIRECTIONAL COMMON-MODE CONFIGURATION (Figure 2) Ideal for Ethernet applications, SMDAxxLCC Series provides up to four (4) lines of protection in a common-mode configuration as depicted in Figure 2. Circuit connectivity is as follows: ✔ TPIN is connected to Pin 5. ✔ TPIP is connected to Pin 6. ✔ TPON is connected to Pin 1. ✔ TPOP is connected to Pin 2. ✔ Pins 3, 4, 7 & 8 are connected to ground. CIRCUIT BOARD LAYOUT RECOMMENDATIONS Circuit board layout is critical for Electromagnetic Compatibility (EMC) protection. The following guidelines are recommended: ✔ The protection device should be placed near the input terminals or connectors, the device will divert the transient current immediately before it can be coupled into the nearby traces. ✔ The path length between the TVS device and the protected line should be minimized. ✔ All conductive loops including power and ground loops should be minimized. ✔ The transient current return path to ground should be kept as short as possible to reduce parasitic inductance. ✔ Ground planes should be used whenever possible. For multilayer PCBs, use ground vias. Figure 1. Unidirectional Common-Mode Protection 5 6 7 8 1 2 3 4 LINE 4 LINE 3 LINE 2 LINE 1 GND PLANE Figure 2. Bidirectional Common-Mode Protection 5 6 7 8 12 34 TPIN TPIP TPOP TPON |
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