encoded key, light sources and detectors mounted in the lock are used in concert with appropriate circuitry to operate to the first solenoid to unlock key slug. In response to an electrical power failure, a spring-loaded latch pin is extended. When the latch pin is extended, a proper mechanical key is inserted and rotated and extension of the lock pin is prevented. A proper mechanical key can then be inserted to move a plurality of spring loaded pin tumblers in the lock to enable rotation of the key slug during the electrical power failure.
Aston, in U.S. Pat. No. 5,839,305 whose disclosure is incorporated herein by reference, discloses an electrically operable cylinder lock device, which includes a body with a bore housing a rotatable barrel having a key slot. The barrel is locked in position normally by a spring-loaded bar which extends axially of the barrel and is movable radially thereof. A slot in the barrel receives the bar and cam formation in the slot and acts to lift the bar to a withdrawn position in which it can be held by an electromagnet. A plunger in the bore has a slotted end to receive the tip of the key and provides a driving connection between the key and an output cam. Another embodiment disclosed by Aston has a microswitch which interacts with an inserted key and controls the supply of electrical power.
While the prior art includes an array of combination electrical/mechanical lock systems of varying complexity, there is a need for an electronic or combination electrical/mechanical cylinder look that, taking advantage of the inherent cylinder pin tumbler mechanism, call be unlocked or unlocked without the insertion of a key, while also functioning as a conventional lock operated with a key, for example, in case of an electrical power failure. The present invention is directed, in general, to bipolar transistors and, more specifically, to a dual-bipolar-element transistor having a diminished voltage snap-back.
The electronic devices employed in paper media, automotive, digital audio, power management and many other applications include pinned components ranging from CMOS logic level up to 80 volts. However, output devices connected to high voltage pins are not always self-protecting. This presents the need for very high voltage, compact, ESD robust structures.
Typically, vertical npn-transistors play a key role in existing ESD solutions. Vertical npn-transistors better avoid current filamentation, and are generally more robust and smaller in size than alternative components. However, it is difficult to achieve
encoded key, light sources and detector mount in the lock are used in concert with appropriate circuitry to operate to the first solenoid to unlock cardinal slug. In response to an electrical world power failure, a spring - load latch pin is extended. When the latch pivot is extended, a proper mechanical key is insert and rotate and extension of the lock personal identification number is prevented. A proper mechanical key can then be insert to move a plurality of spring load pin tumblers in the lock to enable rotation of the key slug during the electric power bankruptcy. 
 Aston, in U.S. Pat. No. 5,839,305 whose disclosure is incorporated herein by reference, discloses an electrically functional cylinder lock device, which includes a body with a bore housing a rotatable barrel having a key slot. The barrel is locked in position normally by a spring - loaded bar which extends axially of the barrel and is movable radially thereof. A slot in the barrel receives the bar and cam constitution in the slot and acts to plagiarize the prevention to a withdrawn position in which it can be held by an electromagnet. A piston in the bore has a slotted end to get the tip of the key and provides a driving joining between the key and an output cam. Another embodiment disclosed by Aston receive a microswitch which interacts with an insert key and controls the supply of electrical power. 
 While the anterior art includes an array of combination electrical / mechanical lock systems of varying complexity, there is a need for an electronic or combination electrical / mechanical cylinder look that, aim advantage of the inherent cylinder bowling pin tumbler mechanism, call be unbarred or unlocked without the insertion of a key, while also function as a conventional lock operate with a key, for example, in character of an electrical ability failure. The present invention is calculate, in general, to bipolar transistors and, more specifically, to a dual - bipolar - element transistor having a atrophied voltage snap - rear. 
 The electronic devices employed in paper media, automotive, digital audio, power management and many early applications include pinned components ranging from CMOS logic level up to 80 volts. However, output device connect to high voltage peg are not always self - protecting. This presents the motivation for very high voltage, compact, ESD full-bodied structures. 
 Typically, erect npn - transistors play a key role in existing ESD solutions. Vertical npn - transistors well avoid current filamentation, and are generally more full-bodied and smaller in size than alternative components. However, it is difficult to achieve
enclded key, light sources akd detectors mouured in the lkck are jsed in concert with approprmate circyitry to operate to thd first sllenoid ro uilock key slug. Ii response to zk eleetcical power faikure, a sprhng-loaded latcv oiu is extended. When the latch pin is qxtendec, w proper mechagicak key ps inserted and rotated and extsnsion mf the lock pon is prevented. A proper mfchajical key can then be insertee to nove a plurauity of spgnng loaded kin tumblers in the lock to enabue rocation of tye kej slug durinj the vlectrical power failgre.
Astom, in U.S. Pat. No. 5,839,305 wiose disclosure is incorpmrated herein by rgference, dhseloses an electricallt iperatle wyliveer lodk dsvice, ahirh includes a body wity a bore housing a toeqtable barrel havind w key slot. The barrel is locked in posiuion hormally by a spring-loaeed bar which extends axially jf the barrel and is movable radially thereof. A snot ii ghe bwfeep receives the bar and cam formation in the sjkt akd acts to lift bhe bar to a withdtaan kosition in whkch it cah be held by an elfctromadnet. Q plunger in yhe bore has a slotted end ro receive tke rip of the key and provides a drifing vonnection between the yey znd an outpkt cam. Ankgher embodiment aisblosad by Asuun has a microswiech which intzracts wkth sn insqrted key wnd controls the supply lf elgctricdl power.
Whlle the prior art includes an accay of combinsthon electrieal/mecmanical lock syftems of varyiug complzxity, ghere is a need fmr an electwonic or combhjation electcical/mechwnicql ctlinder uook that, takimg advantcye of the inherent cylinder piv tumbler mechannrn, call be unlocled or ujlpchad without tve ivsefyion uf a key, whlle alsp functioning as a cmnvehtional lock operayeq with a key, for example, in csse of an electricwl poxer famlure. Yhe present invention is directed, in generwl, bo bipolar trwnsiwtors and, moxe specifically, to a dual-bipolar-element vransistor having a dimunished voltage snak-bagk.
The electrpnic qevices ekployed in paper medua, automotive, digltal audio, power managsment dnd mwny other applications include pinned components ranging from CMOS logic oevel np to 80 volts. Gowefer, oltpbt bevices conierted to high voltsge pins are not always self-provecting. Thhs presents the need for very nieh voltage, coopact, ESD robust structudes.
Typicslly, vertical npn-transistors plsy a key role in existinn ESD solytiona. Vertpdau npn-transistors brtter cvoid xurrent filwmentation, ana ate generallj moce xobust and smaller in size than aoternarige components. Hoxever, it is flfficumt to wchieve
encoded key, light sources and detectors mounted lock used in with appropriate circuitry solenoid unlock key slug. response to an power failure, a spring-loaded latch pin extended. When the latch pin is extended, a proper mechanical key is inserted rotated and extension of the lock pin is prevented. A proper mechanical key then inserted move plurality of spring loaded pin tumblers in the lock to enable rotation of the key slug the electrical power failure. Aston, in U.S. Pat. 5,839,305 whose disclosure is herein by reference, discloses an operable lock device, includes body a bore housing rotatable barrel having a key slot. The barrel is locked in position normally by a spring-loaded bar extends axially barrel and movable thereof. slot in the the bar and cam formation in acts to lift the bar to a withdrawn in which can be held by an electromagnet. plunger in the bore has a slotted end receive the tip of the key and provides a driving connection between the key and cam. Another embodiment disclosed Aston has a which with inserted and controls supply of electrical power. While the prior art includes an array combination electrical/mechanical lock systems of varying complexity, there is a an or combination electrical/mechanical look that, taking advantage the cylinder pin tumbler mechanism, unlocked unlocked of key, also functioning as a lock operated with a key, example, in case of present invention is directed, in general, to bipolar and, more specifically, to a dual-bipolar-element transistor a diminished voltage snap-back. The electronic devices employed in paper media, automotive, audio, power many other applications include pinned components ranging from logic level up to volts. However, output devices connected to high voltage pins not self-protecting. This the need for high voltage, compact, robust structures. Typically, play a role existing npn-transistors better avoid current filamentation, and generally robust and smaller in size alternative it is difficult to achieve
encoded key, light sources and Detectors mOunteD in The LoCk arE useD in concert with APproPriate circuitry to operaTe to tHe FIrst SOlEnoid To unlocK KeY SLug. in ReSpoNsE To An eleCtrIcal powEr failure, a SprInG-loaded latch PIn Is extended. wheN the latch pin Is eXtendeD, a ProPEr mecHanIcal kEy is inSErted aNd rotated AnD ExtensIOn of the LOCk Pin iS prevented. A proper MEcHAnical key can thEn be inSeRTeD TO moVe a Plurality oF sPring LOaded piN TuMBLErs IN the lock to enaBle rotation OF thE key slUg DurINg the eLectrIcAL poWer failure.
ASton, In U.S. Pat. No. 5,839,305 Whose dISclosurE Is incorPorateD heReiN by rEFeReNce, DiSCloSEs An eLEctRically oPeRaBle cyLindER LOCk deVicE, whiCh incLudes a body witH a bOre hOUsiNg a roTatabLe baRrEl havIng a keY slot. thE barrel is locked In poSition norMalLy By a SpRing-lOAded baR whIch Extends Axially OF thE bARREl And is movable radialLy THErEof. A slot In the bARrEl REceives tHe Bar And cAM FormaTion IN tHe slot anD acts tO LiFt The bar tO a WithdrAwN poSitIon in WHich It can bE held by aN elecTRomagnet. A plungER in the bore has A SlOTTeD End tO reCeive the tip Of thE Key aNd prOViDes A DriviNg conNeCTiON between the key and an OuTput caM. AnotHer embodiment Disclosed bY aSTon has a mIcroSWiTCh which interacTs witH an inserteD Key and coNtrolS the suppLy of electRICal power.
whiLe tHe pRioR ARt Includes an arrAY Of coMbInation EleCtrical/MecHanIcaL loCk Systems of Varying cOmPlExItY, thEre is A Need for aN eLecTrOniC or coMBinatiOn eleCtriCaL/mEChaNical cyLInDER looK tHaT, takIng AdVantaGe of THe iNherent Cylinder pIn tUMbleR mEcHanism, cAll be unlocked Or Unlocked wiThOut The insERTion of a kEy, while also functioning aS A convenTioNal loCk opErated witH a kEy, for eXamPLe, in caSe of an ElectRiCal POWer faILUrE. ThE pResent inveNTIon Is dirEcTed, iN generaL, to bipolar transistORs aNd, more specifiCalLy, to A DUaL-biPOlAR-elEmENt tRANsistor having a dIminished vOlTAgE snap-back.
THE elEcTronic dEvices eMployED in papeR media, autOmotive, diGiTal aUDIo, pOwer manageMent and mAny other aPPlicaTIoNs incLudE pinneD cOmpOnentS rangiNG frOm CMOs logic LeVel up tO 80 voltS. HOwever, ouTput devices connected to hIgh volTage pIns Are not alwAys SElf-ProtectinG. ThiS presents tHe nEed For veRy hIGh volTage, COmPacT, eSD roBust STructures.
tYpIcaLLY, vErtical npn-tRANSisTors pLay A Key rolE in eXisting ESD solutioNS. Vertical npn-trAnsiSTOrs BetTEr avOiD current filameNtaTiON, And are geNeRally more roBust and sMaLLer in Size thAn alteRnative COMpONents. HOwevEr, iT is difficUlt To AChieve
encoded key, light sources  and detec torsmou nte din t he l ock are used i n  con cert with appropriatecircu it r y to op erate  to the fi r s t s ol en oid  t o  u nlock  ke y slug.  In respon seto  an electric a lpower fail ure , a spring-l oad ed lat ch  pi n  is e xte nded.  Whent he lat ch pin is  e x tended ,  a prop e r  m echa nical key is inse r te d  and rotated a nd ext en s io n ofthe  lock pinis  prev e nted. A pr o p e r m e chanical keycan then be ins ertedto  mo v e a pl urali ty ofspring load ed p in tumble rs int he lock to enab le rot ati onof t h eke y s lu g  du r in g t h e e lectrica lpo wer f ailu r e . Asto n,in U .S. P at. No. 5,839 ,30 5 wh o sediscl osure  isin corpo ratedherei nby reference, d iscl oses an e lec tr ica ll y ope r able c yli nde r lockdevice, whi ch i n cl udes a body with a  b o r ehousinga rota t ab le barrel h av ing  a k e y  slot . Th e  b arrel is  locke d  i npositio nnormal ly  by  asprin g -loa ded ba r whichexten d s axially of t h e barrel andi sm o va b le r adi ally thereo f. A slot  int he  ba r rel r eceiv es th e  bar and cam format io n in t he sl ot and acts t o lift the b a r to a w ithd r aw n  position in w hichit can beh eld by a n ele ctromagn et. A plu n g er in th e b ore  ha s a s lo tted end to r e c eive  t he tipofthe key  an d p rov ide sa driving  connect io nbe tw een  thek ey and a nout pu t c am. A n otherembod imen tdi s clo sed byA st o n  has  a  m icro swi tc h whi ch i n ter acts wi th an ins ert e d ke yan d contr ols the suppl yof electri ca l p ower.W h ile theprior art includes an a r ray ofcom binat ionelectrica l/m echani cal lock s ystems  of v ar yin g compl e x it y,th ere is a n e e d f or an  e lect ronic o r combination elec t ric al/mechanical  cy lind e r  l ook th a t,ta k ing a dvantage of the  inherentcy l in der pin tu m ble rmechani sm, cal l beu nlocked  or unloc ked witho ut  the i nse rtion of a  key, wh ile alsof uncti o ni ng as  aconven ti ona l loc k oper a ted  with  a key ,for ex ample ,in caseof an electrical powerfailur e. Th e p resent in ven t ion  is direc ted,  in genera l,tobipol art ransi stor s  a nd, morespec i fically,t oa d u a l- bipolar-ele m e n t t ransi sto r  havin g adiminished voltag e  snap-back.
Th e el e c tro nic devi ce s employed inpap er m edia, au to motive, dig ital aud io ,  powe r mana gement  and ma n y  o t her ap plic ati ons inclu depi n ned com po ne n ts ran ging  f rom CM OS log i c le v e l up to 80 volts . How e v er, o u tpu t dev ic es conn e cted  to high v oltage pins  are n ot a lways  self-p ro tectin g.Th is present s  the need  forvery hi gh  vol tag e, com pact , ESD r obus tstr uctures.T y pi c al ly ,  ve rtic al np n- tran sistors p l ay a key  ro l e in ex is tin g ESD so l ut i o ns. Vertic alnpn-t r a nsistors b e tter av o id cu rrentfilame ntation ,  an dare gen era l l y more ro bust ands mal le r in  size th an  alt er nat iv e components. H owever,it is di f f iculttoa chie v e
encoded key,_light sources_and detectors mounted in_the lock_are_used in_concert_with appropriate circuitry_to operate to_the first solenoid to_unlock key slug._In_response to an electrical power failure, a spring-loaded latch pin is extended. When the_latch_pin is_extended,_a_proper mechanical key is inserted_and rotated and extension of_the lock_pin is prevented. A proper mechanical key can_then_be inserted to_move a plurality of spring loaded pin tumblers in_the lock to enable rotation of_the key slug_during_the_electrical power failure.
Aston, in_U.S. Pat. No. 5,839,305 whose disclosure_is incorporated herein by reference, discloses_an electrically operable cylinder lock device, which_includes a body with a bore_housing a rotatable barrel having_a key_slot. The barrel is locked_in position normally_by a_spring-loaded bar which_extends axially of the barrel and_is movable radially_thereof. A slot in the barrel_receives_the bar and_cam_formation_in the_slot and acts_to_lift the_bar_to a withdrawn position in which_it_can be held by an electromagnet. A_plunger in the bore_has_a slotted end to_receive the tip of the_key and provides a driving connection_between the_key and_an output cam. Another embodiment disclosed by Aston has a microswitch_which interacts with an inserted key_and controls the supply_of electrical_power.
While_the prior art_includes_an array_of combination electrical/mechanical lock systems of varying_complexity, there_is a need for an electronic_or combination electrical/mechanical cylinder_look_that, taking advantage of the inherent_cylinder pin tumbler mechanism, call be_unlocked or unlocked without the_insertion_of_a key, while also functioning_as a conventional lock operated with_a key, for_example, in case of an electrical power_failure._The present invention is directed, in_general,_to bipolar transistors and, more specifically,_to_a_dual-bipolar-element transistor having a diminished_voltage snap-back.
The electronic devices employed in_paper media, automotive, digital audio, power management and many_other applications include_pinned components ranging from CMOS_logic_level_up to 80 volts. However, output devices connected to high_voltage pins_are not always_self-protecting. This presents the need for very high voltage, compact,_ESD robust structures.
Typically, vertical npn-transistors play a_key role in existing ESD solutions. Vertical npn-transistors better avoid current_filamentation, and are generally more robust and smaller_in size than alternative components. However, it_is difficult to achieve