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PSMS05-T7 Datasheet(PDF) 4 Page - Protek Devices |
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PSMS05-T7 Datasheet(HTML) 4 Page - Protek Devices |
4 / 5 page PSMS05 thru PSMS24C 4 05095.R5 3/07 www.protekdevices.com APPLICATION NOTE 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. The PSMS Series are TVS arrays designed to protect I/O or data lines from the damaging effects of ESD or EFT. This product series provides both unidirectional and bidirectional protection, with a surge capability of 350 Watts P PP per line for an 8/20µs waveform and ESD protection > 25 kilovolts. UNIDIRECTIONAL COMMON-MODE CONFIGURATION (Figure 1) The PSMS 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 1. ✔ Line 2 is connected to Pin 3. ✔ Line 3 is connected to Pin 4. ✔ Line 4 is connected to Pin 6. ✔ Pin 5 is connected to ground. ✔ Pin 2 is not connected. BIDIRECTIONAL COMMON-MODE CONFIGURATION (Figure 2) The PSMSxxC Series provides up to four (4) lines of protection in a common-mode configuration as depicted in Figure 2. Circuit connectivity is as follows: ✔ Line 1 is connected to Pin 1. ✔ Line 2 is connected to Pin 3. ✔ Line 3 is connected to Pin 4. ✔ Line 4 is connected to Pin 5. ✔ Pin 6 is connected to ground. ✔ Pin 2 is not connected. Figure 1 - Unidirectional Configuration Common-Mode I/O Port Protection 3 1 5 6 2 4 LINE 1 LINE 2 LINE 3 LINE 4 Figure 2 - Bidirectional Configuration Common-Mode I/O Port Protection 3 1 5 6 2 4 LINE 1 LINE 2 LINE 3 LINE 4 |
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