microsemi scottsdale division 8700 e. thomas rd. po box 1390, scottsdale, az 85252 usa, (480) 941 - 6300, fax: (480) 947 - 1503 page 1 copyright ? 2001 mscxxxx.pdf 7 - 30 2002 rev c www. microsemi . com slvu2.8k - 4 2 differential line pairs tvsarray ? scottsdale division slvu2.8k - 4 description the slvu2.8k - 4 provides 500 watt protection with low capacitance and the lowest leakage in the industry for two lines in common mode or two differential line pairs. low bi - directional capacitance of 10 pf per line pair and the low stan dby current provides a more stable signal in higher frequency applications and at lower operating voltages of 2.8 volts. the slvu2.8k - 4 bidirectional array is designed for use in applications where protection is required at the board level from voltage tra nsients caused by electrostatic discharge (esd) as defined in iec 61000 - 4 - 2, electrical fast transients (eft) per iec 61000 - 4 - 4 and effects of secondary lightning. these arrays are used to protect two differential line pairs in a bi - directional mode by con necting both pins 1 and 8 to line 1 of pair one and pins 2 and 7 to line 2 of pair one. for protecting a second pair, connect pins 3 and 6 to line 1 of pair two, and pins 4 and 5 to line 2 of pair two as shown in figures 4 and 4a. the array can also be use d for protecting two direct lines in the common mode by connecting either side of the pair to ground and the other side to line as shown in figure 3. important: for the most current data, consult microsemi ?s website: http://www.microsemi.com electrical characteristics per line @ 25c unless otherwise specified stand off voltage v wm volts punch - thru voltage v pt i pt = 2 a volts snap - back voltage v sb i sb = 50 ma volts standby (leakage) current i d v wm = 2.8v a clamping voltage v c i pp = 2 a (figure 2) volts clamping voltage v c i pp = 5 a (figure 2) volts clamping voltage v c i pp = 24 a (figure 2) volts capacitance (f=1 mhz) * c @0v pf part number device marking max min min max max max max typ slvu2.8k - 4 2.8k - 4 2.8 3.0 2.8 0.1 5.5 8.5 15 5 * capacitance per line pair or line - to - ground is 10 pf typical for bi - directional protection. note: transient voltage suppressor (tvs) product is normally selected based on its stand off voltage v wm . product selected vol tage should be equal to or greater than the continuous peak operating voltage of the circuit to be protected. tvs array ? series applications eia - rs232 data rate: 19.6 kbs eia - rs422 data rate: 10 mbs eia - rs423 data rate: 100 kbs 10 / 100 ethernet wan / lan equipment features protects 2 bidirectional lines or 2 differential line pairs provides electrically - isolated protection low operating voltage: 2.8 volts low bidirectional capacitance: 10 pf low clamping voltage of 5.5 volts at 2 amps maximum ratings operating tempera ture: - 55c to +150c storage temperature: - 55c to +150c peak pulse power: 500 watts (8/20 s, figure 1 and figure 2) mechanical molded so - 8 surface mount ul 94v - 0 flammability classification weight 0.066 grams (approx imate) marking: logo, device marking code, date code pin #1 defined by dot on top of package packaging tape & reel per eia standard 481 13 inch reel; 2,500 pieces (standard) carrier tubes; 95 pcs (optional)
microsemi scottsdale division 8700 e. thomas rd. po box 1390, scottsdale, az 85252 usa, (480) 941 - 6300, fax: (480) 947 - 1503 page 2 copyright ? 2001 mscxxxx.pdf 7 - 30 2002 rev c www. microsemi . com slvu2.8k - 4 2 differential line pairs tvsarray ? scottsdale division 8/20s 500w pulse figure 1 peak pulse power vs pulse time t = sec slvu2.8k - 4 symbols & definition s symbol definition v wm stand off voltage: maximum dc v oltage that can be applied over the operating temperature range. v wm must be selected to be equal or be greater than the operating voltage of the line to be protected. v pt punch - thru voltage: the minimum voltage the device will exhibit at a specified cu rrent v sb snap - back voltage: the minimum snap - back voltage the device will exhibit at a specified current v c clamping voltage: maximum clamping voltage across the tvs device when subjected to a given current at a pulse time of 20 s. i d standby curre nt: leakage current at v wm. c capacitance: capacitance of the tvs as defined @ 0 volts at a frequency of 1 mhz and stated in picofarads. graphs outline and schemati c inches millimeters max min dim max min 0.197 a 0.188 4.77 5.00 0.158 0.150 3.81 4.01 0.069 0.053 1.35 1.75 0.021 0.011 0.28 0.53 0.050 0.016 0.41 1.27 0.050 bsc 1.27 bsc 0.010 0.006 0.15 0.25 0.008 0.004 0.10 0.20 0.206 0.189 4.80 5.23 b c d f g j k l 0.244 p 0.228 5.79 6.19 figure 2 pulse wave form ppp peak pulse p ower (w) outline pad layout schematic
microsemi scottsdale division 8700 e. thomas rd. po box 1390, scottsdale, az 85252 usa, (480) 941 - 6300, fax: (480) 947 - 1503 page 3 copyright ? 2001 mscxxxx.pdf 7 - 30 2002 rev c www. microsemi . com slvu2.8k - 4 2 differential line pairs tvsarray ? scottsdale division slvu2.8k - 4 application notes note: transient voltage suppressor (tvs) product is normally selected based on its stand off voltage v wm . product selected voltage should be equal to or greater than the continuous p eak operating voltage of the circuit to be protected. all electronic equipment are susceptible to damage generated by esd, eft and lightning interference. with this in mind the sluv2.8k - 4 was designed to provide a level of component protection that meets or exceeds iec standards 61000 - 4 - 2 and 61000 - 4 - 4 plus moderate levels of induced lightning. this device can be used for protecting two bidirectional lines in the common mode, or two line pairs in the differential mode. the following description defines common and differential mode configurations. bidirectional two line common mode (figure 3) two lines can be protected in the bidrectional common mode by utilizing the slvu2.8k - 4 product. devices are connected in an anti - parallel configuration between line and ground. pins 1 and 8 are connected to line (or ground) while the pin pair 2 and 7 is connected to the ground (or line). note that product can be connected in either configuration. for protecting the second line in the bidirectional common mode pins 4 and 5 are connected to line 2 (or ground) while the pin pair 3 and 6 are connected to the ground (or line). note tha t product can be connected in either configuration. bidirectional two line pair differential mode (figure 4 and figure 4a) two line pairs can be protected in the differential m ode by utilizing the slvu2.8k - 4 product. the device circuits are connected in an anti - parallel configuration between line 1 and line 2 of the line pair to be protected. for protecting line pair #1, pins 1 and 8 are connected to line 2 and pin 2 and 7 are connected to line 1 of the line pair. for protecting line pair #2 in the bidirectional - differential mode, connect pins 4 and 5 to line 1 and pins 3 and 6 to line 2 of line pair #2 figure 3 common mode configuration figure 4 differential mode configuration figure 4a differential mode configuration circuit board layout
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