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 and rohs recast 2011/65/eu june 8, 2011. 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 trigger 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 sensi- tive 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 ? 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 +125 ? t stg storage temperature range -65 to +150 ? *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 ? 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 ? 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 10 14 18 v r th(j-l) junction to package pads - fr4 using recommended pad layout 116 ?/w r th(j-l) junction to package pads - fr4 using heat sink on board (6 cm 2 ) 96 ?/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 overvoltage 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 cur- rent 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 ? - once line current exceeds the tbu device? 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 device 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 trigger current 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 ?/sec. max. preheat - temperature min. (tsmin) - temperature max. (tsmax) - time (tsmin to tsmax) 150 ? 200 ? 60-180 sec. time maintained above: - temperature (tl) - time (tl) 217 ? 60-150 sec. peak/classi cation temperature (tp) 260 ? time within 5 ? of actual peak temp. (tp) 20-40 sec. ramp-down rate 6 ?/sec. max. time 25 ? 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 ambient 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 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 tbu high-speed protectors have a 100 % matte-tin termination nish. for improved thermal dissipation, the recommended layout uses pcb copper areas which extend beyond the exposed solder pad. the exposed solder pads should be de ned by a solder mask which matches the pad layout of the tbu device in size and spac- ing. it is recommended that they should be the same dimension as the tbu pads but if smaller solder pads are used, they should be centered on the tbu package terminal pads and not more than 0.10-0.12 mm (0.004-0.005 in.) smaller in overall width or length. solder pad areas should not be larger than the tbu pad sizes to ensure adequate clearance is maintained. the recommended stencil thickness is 0.10-0.12 mm (0.004-0.005 in.) with a stencil opening size 0.025 mm (0.0010 in.) less than the solder pad size. extended copper areas beyond the solder pad signi cantly improve the junction to ambient thermal resistance, resulting in operation at lower junction temperatures with a corresponding bene t of reliability. all pads should soldered to the pcb, includ- ing pads marked as nc or nu but no electrical connection should be made to these pads. for minimum parasitic capacitance, it is recommended that signal, ground or power signals are not routed beneath any pad.
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 united states and other countries. rev. 12/11 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. 2.8 (.110) 3.0 (.118) 5.4 (.212) 5.6 (.220) 1.5 (.059) 1.6 (.063) 1.5 (.059) - 1.65 (.065) 1.85 (.073) 5.45 (.214) 5.55 (.218) 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) 3.8 (.150) 4.2 (.165) 3.8 (.150) 4.2 (.165) 1.95 (.077) 2.05 (.081) 0.25 (.010) 0.35 (.014) 11.7 (.461) 12.3 (.484) 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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