features superior circuit protection overcurrent and overvoltage protection blocks surges up to rated limits high speed performance small smt package rohs compliant* agency recognition: applications set top box lnb ports protection modules and dongles process control equipment test and measurement equipment general electronics tbu-ke series - tbu high speed protectors *rohs directive 2002/95/ec jan 27, 2003 including annex. speci cations are subject to change without notice. customers should verify actual device performance in their speci c applications. general information the tbu-ke series of bourns ? tbu ? (transient blocking unit) products are very low capacitance unidirectional high speed surge protection components designed to protect against faults caused by short circuits, ac power cross, induction and lightning surges. the tbu-ke is a unidirectional tbu ? device: the tbu ? protector will trip in less than 1 s when the current reaches the maximum value in one direction only, that is when pin 1 is positive in voltage with respect to pin 2. no current limiting exists in the oppo- site polarity, and the tbu ? protector appears as resistive in nature. the reverse current should not exceed the maximum trip current level of the tbu ? device. an external diode may be used to prevent reverse current in dc biased applications. the tbu ? protector blocks surges and provides an effective barrier behind which sen- sitive electronics will not be exposed to large voltages or currents during surge events. after the surge, the tbu ? device resets when the voltage across the tbu ? device falls to the v reset level. the tbu ? device will automatically reset on lines which have no dc bias or have dc bias below v reset (such as unpowered signal lines). the tbu ? device is provided in a surface mount dfn package and meets industry standard requirements such as rohs and pb free solder re? ow pro? les. agency approval description ul file number: e315805 absolute maximum ratings (@ t a = 25 c unless otherwise noted) symbol parameter part number value unit v imp peak impulse voltage withstand with duration less than 10 ms tbu-ke025-xxx-wh tbu-ke040-xxx-wh tbu-ke050-xxx-wh 250 400 500 v v rms continuous a.c. rms voltage tbu-ke025-xxx-wh tbu-ke040-xxx-wh tbu-ke050-xxx-wh 100 200 250 v t op operating temperature range -40 to +85 c t stg storage temperature range -65 to +150 c *rohs compliant e2550 0072 tbu ? device line side 12 load side asia-paci? c: tel: +886-2 2562-4117 fax: +886-2 2562-4116 europe: tel: +41-41 768 5555 fax: +41-41 768 5510 the americas: tel: +1-951 781-5500 fax: +1-951 781-5700 www.bourns.com
speci cations are subject to change without notice. customers should verify actual device performance in their speci c applications. tbu-ke series - tbu high speed protectors electrical characteristics (@ t a = 25 c unless otherwise noted) symbol parameter part number min. typ. max. unit i trigger current required for the device to go from operating state to protected state tbu-kexxx-050-wh tbu-kexxx-100-wh tbu-kexxx-200-wh tbu-kexxx-300-wh tbu-kexxx-500-wh 50 100 200 300 500 75 150 300 450 750 100 200 400 600 1000 ma r device series resistance of the tbu ? device v imp = 250 v i trigger (min.) = 50 ma v imp = 250 v i trigger (min.) = 100 ma v imp = 250 v i trigger (min.) = 200 ma v imp = 250 v i trigger (min.) = 300 ma v imp = 250 v i trigger (min.) = 500 ma v imp = 400 v i trigger (min.) = 50 ma v imp = 400 v i trigger (min.) = 100 ma v imp = 400 v i trigger (min.) = 200 ma v imp = 400 v i trigger (min.) = 300 ma v imp = 400 v i trigger (min.) = 500 ma v imp = 500 v i trigger (min.) = 50 ma v imp = 500 v i trigger (min.) = 100 ma v imp = 500 v i trigger (min.) = 200 ma v imp = 500 v i trigger (min.) = 300 ma v imp = 500 v i trigger (min.) = 500 ma tbu-ke025-050-wh tbu-ke025-100-wh tbu-ke025-200-wh tbu-ke025-300-wh tbu-ke025-500-wh tbu-ke040-050-wh tbu-ke040-100-wh tbu-ke040-200-wh tbu-ke040-300-wh tbu-ke040-500-wh tbu-ke050-050-wh tbu-ke050-100-wh tbu-ke050-200-wh TBU-KE050-300-WH tbu-ke050-500-wh 12.5 6.3 3.4 2.4 1.8 13.0 6.8 3.9 3.0 2.3 13.7 7.5 4.6 3.6 3.0 14.6 7.5 4.1 3.1 2.3 15.2 8.1 4.7 3.7 2.9 16.0 8.9 5.5 4.5 3.6 t block time for the device to go from normal operating state to protected state 1 s i q current through the triggered tbu ? device with 50 vdc circuit voltage 0.25 0.50 1.00 ma v reset voltage below which the triggered tbu ? device will transition to normal operating state 12 16 20 v r th(j-l) junction to package pads - fr4 using recommended pad layout 116 c/w r th(j-l) junction to package pads - fr4 using heat sink on board (6 cm 2 ) 96 c/w
tbu-ke series - tbu high speed protectors speci cations are subject to change without notice. customers should verify actual device performance in their speci c applications. reference application the tbu ? device can be used to protect against excessive voltage surges in dc biased equipment, as shown in the ? gure below. diode d1 prevents reverse voltage surges from damaging the equipment, and the tbu ? protector prevents any positive surges from causing damage. an overvoltage protection device, such as an mov, may be used to provide additional overvolt- age protection if the surge voltage is likely to be above the maximum rating of the tbu ? device. d1 reverse voltage rating should be greater than that of the ovp device at the maximum surge current level. typically, a 1n4007 is a suitable choice. d2 should be chosen to be above the normal working voltage of the protected device, but below its absolute maximum rating. the tbu ? device is a silicon-based, solid-state, resettable device which is placed in series with a signal path. the tbu ? device operates in approximately 1 s - once line current exceeds the tbu ? device?s trigger current i trigger . when oper- ated, the tbu ? device restricts line current to less than 1 ma typically. when operated, the tbu ? device will block all system voltages and any other voltages including the surge up to rated limits. after the surge, the tbu ? device resets when the voltage across the tbu ? device falls to the v reset level. the tbu ? de- vice will automatically reset on lines which have no dc bias or have dc bias below v reset (such as unpowered signal lines). if the line has a normal dc bias above v reset , the voltage across the tbu ? device may not fall below v reset after the surge. in such cases, special care needs to be taken to ensure that the tbu ? device will reset, otherwise an automatic or manual power down will be required. bourns application engineers can provide further assistance. basic tbu operation performance graphs v-i characteristic - TBU-KE050-300-WH (pin 2-1) typical trigger current vs. temperature current (100 ma/div.) voltage (5 v/div.) v reset i trigger 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -75 -50 -25 0 25 50 75 100 125 150 junction temperature (?) normalized trip current (a) equip. ovp tbu ? device line side 12 d2 d1
re ow pro le pro le feature pb-free assembly average ramp-up rate (tsmax to tp) 3 c/sec. max. preheat - temperature min. (tsmin) - temperature max. (tsmax) - time (tsmin to tsmax) 150 c 200 c 60-180 sec. time maintained above: - temperature (tl) - time (tl) 217 c 60-150 sec. peak/classi? cation temperature (tp) 260 c time within 5 c of actual peak temp. (tp) 20-40 sec. ramp-down rate 6 c/sec. max. time 25 c to peak temperature 8 min. max. speci cations are subject to change without notice. customers should verify actual device performance in their speci c applications. tbu-ke series - tbu high speed protectors performance graphs (continued) power derating curve typical resistance vs. temperature no additional pcb cu 0.5 sq. in. additional pcb cu junction temperature (?) 20 3.0 2.5 2.0 1.5 1.0 0.5 0.0 40 60 80 100 120 140 total max. power (w) 2.2 1.6 1.8 2.0 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -75 -50 -25 0 25 50 75 100 125 150 junction temperature (?) normalized resistance ( )
pin 1 & backside chamfer 2.50 ?0.10 (.098 ?.004) 0.00 - 0.05 (.000 - .002) 5.00 ?0.10 (.197 ?.004) 1.00 (.039) 0.85 ?0.05 (.033 ?.002) 1.90 (.075) 0.60 (.024) 0.30 (.012) 0.30 (.012) 3.05 (.120) 0.75 (.030) c pin 1 0.25 (.010) 0.30 (.012) product dimensions pad # pin out 1 line side 2 load side pad designation dimensions: mm (inches) recommended pad layout tbu ? protectors have matte-tin termination ? nish. the suggested layout should use non-solder mask de? ne (nsmd). the recommended stencil thickness is 0.10-0.12 mm (.004- .005 in.) with a stencil opening size 0.025 mm (.0010 in.) less than the device pad size. as when heat sinking any power device, it is recommended that wherever possible, extra pcb copper area is allowed. for minimum parasitic capacitance, do not allow any signal, ground or power signals beneath any of the pads of the device. speci cations are subject to change without notice. customers should verify actual device performance in their speci c applications. 1 2 dark grey areas show added pcb copper area for better thermal resistance. tbu-ke series - tbu high speed protectors thermal resistance vs. additional pcb cu area added cu area (sq. in.) 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 100 90 80 60 40 20 0 thermal resistance to ambient (?/w) 10 30 50 70
speci cations are subject to change without notice. customers should verify actual device performance in their speci c applications. tbu-ke series - tbu high speed protectors how to order tbu - ke 025 - 500 - wh tbu ? product series ke = uni-series impulse voltage rating 025 = 250 v 040 = 400 v 050 = 500 v trigger current 050 = 50 ma 100 = 100 ma 200 = 200 ma 300 = 300 ma 500 = 500 ma hold to trip ratio suf? x w = hold to trip ratio package suf? x h = dfn package typical part marking ?bu?is a registered trademark of bourns, inc. in the u.s., taiwan and european community. 12/10 packaging speci cations b a d c n f g (measured at hub) user direction of feed k 0 b 0 p 2 d 1 center lines of cavity embossment t d p 0 top cover tape e w p a 0 dimensions: mm (inches) a b c d g n min. max. min. max. min. max. min. max. ref. ref. 176 (6.929) 178 (7.008) 1.5 (.059) 2.5 (.098) 12.8 (.504) 13.5 (.531) 20.2 (.795) - 16.5 (.650) 102 (4.016) a 0 b 0 d d 1 e f min. max. min. max. min. max. min. max. min. max. min. max. 4.2 (.165) 4.4 (.173) 6.65 (.262) 7.05 (.277) 1.5 (.059) 1.6 (.063) 1.5 (.059) - 1.65 (.065) 1.85 (.073) 7.4 (.291) 7.6 (.299) k 0 p p 0 p 2 t w min. max. min. max. min. max. min. max. min. max. min. max. 1.1 (.043) 1.3 (.051) 7.9 (.311) 8.1 (.319) 3.9 (.159) 4.1 (.161) 1.9 (.075) 2.1 (.083) 0.25 (.010) 0.35 (.014) 15.7 (.618) 16.3 (.642) quantity: 3000 pieces per reel pin 1 manufacturing date code - 1st digit indicates the year? 6-month period. - 2nd digit indicates the week number in the 6-month period. - 3rd & 4th digits indicate specific lot for the week. 6-month period codes: a = jan-jun 2009 c = jan-jun 2010 e = jan-jun 2011 b = jul-dec 2009 d = jul-dec 2010 f = jul-dec 2011 manufacturer? trademark product code - 1st digit indicates product family: e = tbu-ke series - 2nd & 3rd digits indicate impulse voltage: 25 = 250 v 40 = 400 v 50 = 500 v - 4th & 5th digits indicate trigger current: 05 = 50 ma 10 = 100 ma 20 = 200 ma 30 = 300 ma 50 = 500 ma
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