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and replacement 8 characteristics 9 applications 10 see also 11 references 12 further reading 13 external links toggle the table of contents silicon controlled switch add languages add links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia four terminal thyristor semiconductor device silicon controlled switch scs component type thyristor working principle regenerative pnpn switching inventor 1960s pin names anode cathode anode gate cathode gate a silicon controlled switch scs is a four terminal semiconductor device belonging to the thyristor family it is a pnpn device similar in structure to the silicon controlled rectifier scr but it provides separate control terminals for both turning the device on and turning it off the scs has connections to both transistor bases in the equivalent two transistor model allowing either gate terminal to initiate switching 1 the device was mainly used in electronic switching timing pulse generation and logic circuits during the 1960s and 1970s its use declined with the development of more versatile semiconductor devices such as mosfets igbts and integrated circuits history edit the silicon controlled switch was developed as part of the early development of pnpn semiconductor devices following the introduction of the thyristor and the silicon controlled rectifier unlike the scr which normally has only one gate connection the scs brought out connections to both internal transistor regions enabling direct control of both switching transitions during the period when discrete semiconductor logic and timing circuits were widely used scs devices were employed as bistable switching elements because they combined the advantages of a transistor switch with the latching characteristics of a thyristor construction edit scs pnpn physical layer structure an scs consists of four alternating semiconductor layers forming a pnpn structure 2 3 and the device has four external terminals anode a cathode k anode gate ag cathode gate kg the internal structure may be represented as two interconnected bipolar transistors a pnp transistor an npn transistor the collector of each transistor is connected to the base of the other creating regenerative feedback this structure is similar to the equivalent circuit used to explain scr operation operation edit the scs operates through regenerative switching in the off state the pnpn structure blocks current when sufficient triggering current is applied to one of the gate terminals the internal transistor pair begins conducting increasing the regenerative feedback until the device switches into the low resistance on state unlike a conventional scr the scs provides two independent gate connections the cathode gate can be used to trigger the device into conduction the anode gate can be used to reduce regenerative action and turn the device off because both transistor base regions are externally accessible the scs offers greater control flexibility than a standard scr 1 4 the two transistor model edit the silicon controlled switch can be represented as two interconnected bipolar transistors forming a regenerative feedback loop the equivalent circuit consists of equivalent two transistor model used to explain thyristor operation the operation of the scs can be understood using the same regenerative model used for other thyristors the device behaves as two coupled bipolar transistors a pnp transistor connected from anode toward the internal structure an npn transistor connected from the internal structure toward the cathode when the combined current gains of the two transistors approach unity regenerative action causes rapid switching from the blocking state to the conducting state 1 the regenerative action of the two transistors is responsible for the latching behavior of the device when one transistor begins conducting it supplies additional base current to the other transistor causing both devices to rapidly enter conduction the main difference between an scs and an scr is that the scs provides external access to both transistor control regions whereas the scr normally exposes only one gate terminal this additional connection allows the scs to be switched off by an external control signal rather than relying only on current interruption comparison with the silicon controlled rectifier edit the silicon controlled switch and the silicon controlled rectifier share the same basic pnpn semiconductor structure but differ in their external connections and intended use feature silicon controlled switch scs silicon controlled rectifier scr number of terminals four three gate control turn on and turn off control primarily turn on control power capability generally low power available in high power versions main applications switching timing logic circuits power control and rectification control terminals anode gate and cathode gate gate terminal only because scrs can handle substantially higher currents and voltages they became dominant in power electronics applications scs devices remained mainly limited to low power switching and control circuits advantages and limitations edit advantages edit the scs provided several advantages in early semiconductor circuits both switching transitions could be controlled electronically 5 the device had a simple bistable operation gate triggering required relatively little power 6 reduced turn off time 1 to 10 μs in scs compared to 5 to 30 μs in scr 6 the latching behavior allowed reliable switching without continuous gate drive limitations edit the device also had important limitations 5 lower current and voltage ratings than many scr devices slower switching compared with modern transistor based switches limited availability after the introduction of integrated circuits poor suitability for modern power electronics applications decline and replacement edit during the 1970s and 1980s many applications of the scs were replaced by integrated circuits and semiconductor devices with greater flexibility digital logic functions were increasingly implemented using transistor transistor logic ttl complementary metal oxide semiconductor cmos and microprocessors for switching applications the development of power mosfets insulated gate bipolar transistors igbts and improved thyristor families reduced the need for discrete scs components although rarely used in new designs the scs remains historically significant as an early example of a controllable thyristor device and as part of the development path from discrete semiconductor switches to modern integrated electronics characteristics edit typical characteristics of scs devices include four layer pnpn construction four external terminals latching operation low power gate triggering electronic turn on and turn off control bistable switching behavior compared with scrs scs devices generally operated at lower power levels but provided more precise control of switching states volt ampere characteristic the volt ampere behavior 7 of an scs is similar to that of an scr increased voltage causes current to increase slowly and then rapidly in and at some point the scs is switched upon product β1 β2 of the transistors exceeds unity and the device enters on state the scs provides negative differential resistance in the on state similar to the scr 6 applications edit historical applications of silicon controlled switches included pulse generators timing circuits oscillators digital counters alarm circuits trigger circuits electronic switching systems as integrated circuits and modern transistor technologies became widely available most of these applications moved to other semiconductor technologies see also edit thyristor silicon controlled rectifier gate turn off thyristor triac diac programmable unijunction transistor mosfet references edit 1 2 3 grafham d r 1972 scr manual pdf 5th ed general electric p 4 klang pusat sumber al ilmi kolej vokasional electronic devices and circuit theory technical information center 1988 thyristor device data pdf motorola the silicon controlled switch scs thyristors electronics textbook www allaboutcircuits com retrieved 2026 07 16 1 2 best guide to silicon controlled switches scs thyristors www ntchip com retrieved 2026 07 16 1 2 3 eeeguide 2022 12 03 silicon controlled switch scs symbol operation advantages and application eeeguide com retrieved 2026 07 16 workbook electrical 2022 04 10 what is silicon controlled switch scs working symbol construction electricalworkbook retrieved 2026 07 16 further reading edit scr manual pdf 5th ed general electric 1972 rashid muhammad h 2014 power electronics circuits devices and applications 4th ed pearson isbn 978 0133125900 baliga b jayant 2008 fundamentals of power semiconductor devices springer isbn 978 0387473130 external links edit general electric scr manual 1972 the silicon controlled switch scs v t e electronic components semiconductor devices mos transistors transistor nmos pmos bicmos biofet chemical field effect transistor chemfet complementary mos cmos depletion load nmos fin field effect transistor finfet floating gate mosfet fgmos insulated gate bipolar transistor igbt isfet ldmos mos field effect transistor mosfet multi gate field effect transistor mugfet power mosfet thin film transistor tft vmos umos qfet tunnel field effect transistor tfet high electron mobility transistor hemt rf cmos native transistor other transistors bipolar junction transistor bjt darlington transistor diffused junction transistor field effect transistor fet junction gate fet jfet organic fet ofet light emitting transistor let pentode transistor point contact transistor programmable unijunction transistor put static induction transistor sit tetrode transistor nanoscale vacuum channel transistor nvct single electron transistor set heterojunction bipolar transistor hbt mesfet heterostructure emitter bipolar transistor hebt itfet avalanche transistor junctionless nanowire transistor jlnt schottky transistor spin transistor ballistic collection transistor ballistic deflection transistor bdt drift field transistor organic electrochemical transistor oect spacistor surface barrier transistor synaptic transistor oxide thin film transistor nomfet grown junction transistor eosfet alloy junction transistor fe fet dna field effect transistor dnafet diodes avalanche diode shockley diode selenium rectifier fast diode single photon avalanche diode spad constant current diode cld crd gunn diode varicap impatt diode metal insulator metal diode mim diode transient voltage suppression diode tvs diode laser diode ld light emitting diode led organic light emitting diode oled photodiode pin diode p n diode tunnel diode avalanche photodiode apd solar cell multi junction solar cell mj hybrid solar cell schottky junction solar cell plasmonic solar cell heterojunction solar cell hjt schottky diode step recovery diode srd zener diode resonant tunneling diode rtd photoreflector backward diode geometric diode lr diode chua s diode baritt diode stabistor phosphorescent organic light emitting diode pholed thin film diode superluminescent diode sld josephson diode hole accumulation diode had silicon photomultiplier sipm metal rectifier bifacial solar cells bsc integrated circuits hybrid integrated circuit hic mixed signal integrated circuit mos integrated circuit mos ic three dimensional integrated circuit 3d ic photonic integrated circuit pic application specific integrated circuit asic field programmable gate array fpga system on a chip soc other devices diac heterostructure barrier varactor light emitting capacitor lec memistor memristor memtransistor memory cell metal oxide varistor mov organic semiconductor photodetector silicon controlled rectifier scr silicon controlled switch scs solaristor static induction thyristor sith thyristor trancitor triac varicap vertical cavity surface emitting laser vcsel gate turn off thyristor gto integrated gate commutated thyristor igct unijunction transistor ujt quantum cascade laser qcl photoresistor quantum dot display quantum dot solar cell photoelectrochemical cell dye sensitized solar cell plasmonic solar cell quantum dot laser quadrac interband cascade laser icl oscillistor mos composite static induction thyristor csmt mos controlled thyristor mct resistive opto isolator ro emitter turn off thyristor eto trisil quantum well infrared photodetector qwip quantum cascade detector qcd resonant cavity enhanced photo detector rce golay cell hybrid pixel detector semiconductor detector voltage regulators linear regulator low dropout regulator switching regulator buck boost buck boost split pi ćuk sepic charge pump switched capacitor vacuum tubes standard acorn tube audion beam tetrode barretter compactron diode fleming valve neutron tube nonode nuvistor pentagrid hexode heptode octode pentode photomultiplier pmt phototube tetrode triode x ray tube double diode triode additron tube computron tube micropup rf backward wave oscillator bwo cavity magnetron crossed field amplifier cfa gyrotron inductive output tube iot klystron maser sutton tube traveling wave tube twt vircator cathode ray tubes beam deflection tube charactron iconoscope magic eye tube monoscope selectron tube storage tube trochotron video camera tube williams tube gas filled tubes crossatron dekatron ignitron krytron mercury arc valve nixie tube thyratron trigatron voltage regulator tube geiger müller tube wire chamber neon lamp adjustable potentiometer digital variable capacitor varicap passive connector audio and video electrical power rf ferrite antifuse fuse resettable efuse resistor switch thermistor varistor reactive capacitor types ceramic resonator crystal oscillator inductor relay reed relay mercury relay other devices hall effect sensor squid spin valve magnetic tunnel junction mtj planar hall sensor ggnmos retrieved from https en wikipedia org w index php title silicon controlled_switch oldid 1373727925 categories electric power systems components high voltage direct current power electronics solid state switches hidden categories articles with short description short description matches wikidata this page was last edited on 7 september 2026 at 16 22 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile 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