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Topic: Triacs

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Seebeck effect

	Triacs
		The triac can be triggered by a gate-trigger pulse which is either positive or negative with respect to main terminal No.1 when main terminal No.2 is either positive or negative with respect to main terminal No. 1.
		The triac, therefore, can be triggered in any of four operating modes, as summarized in Table I. The quadrant designations refer to the operating quadrant on the principal voltage-current characteristics (either I or III), and the polarity symbol represents the gate-to-main-terminal-No. 1 voltage.
		For RCA triacs, the maximum trigger-current rating in the published data is the largest value of gate current that is required to trigger the selected device in any operating mode.
	www.eteonline.com /triacs.html (266 words)

	Control circuit for hospital bed - Patent 4044286
		Gating of the gating triacs is achieved by an appropriate switching arrangement, which obtains a gating signal for the gating triacs from the secondary winding of the power transformer.
		The number of power triacs employed will depend, of course, upon the number of functions to be achieved, but as this preferred embodiment relates to a bed having three movable portions, each of which is positionable in two directions, a total of six power triacs are employed.
		The first terminals of triacs 35 and 36 are connected to the neutral side 25 of plug 21, while the first terminals of triacs 37-40 are connected to the hot side 23 of plug 21.
	www.freepatentsonline.com /4044286.html (5990 words)

	STMicroelectronics \| IMPROVEMENT IN THE TRIAC COMMUTATION
		The commutation problem of the triac In its electrical representation the triac can be compared to two thyristors mounted in anti-parallel and coupled with a control device which allows activation of this AC switch with only one gate (see Figure 1a).
		The use of a triac without a snubber network The triac can thus be considered as a switch which turns off at the moment when the current is cut off in the dampened oscillating circuit constituted by the loads L and R and the internal capacity of the triac Ct (see Figure 6).
		Logic Level triacs In this category we consider sensitive triacs in which the maximum gate current (IGT) is 5mA for the TW type and 10mA for the SW one.
	www.st.com /stonline/books/ascii/docs/3577.htm (2625 words)

	triacs and airflow
		The heat dissipated by a triac is a result of the fact that semiconductors do not instantaneously turn on and turn off.
		There are two thermodynamic behaviors here involved - the triac's heat attempting to reach equilibrium with the heat sink and the heat sink's absorbed heat trying to reach equilibrium with its ambient environment.
		Triacs have 2 halves, each of which looks like a silicon-controlled rectifier (SCR)and each of which conducts one half of the line cycle.
	themeyers.org /HomeRoast/Topic4765.htm (570 words)

	Semiconductor relays
		If the power generated by the triac is more than what the case itself can handle you must use a suitable heatsink (when installing heatsink rember that the triac case metal is live and it is usually a good idea to put some suitable electrical insulation between the heatsink and the triac case).
		For example for 10A triac circuit (2300V at 230V mains voltage) a 10 cm of 25 x 40 mm aluminium L-profile bolted to triac and circuit board is adequate.
		The resistor R3 and capacitor C1 are for snubbing of the triac and may or may not be necessary depending upon the particular triac and load used.
	www.epanorama.net /circuits/semiconductor_relays.html (7394 words)

	The World Market for Thyristors, Diacs and Triacs
		This report was created for strategic planners, international executives and import/export managers who are concerned with the market for thyristors, diacs, and triacs excluding photosensitive devices.
		The total level of imports and exports on a worldwide basis, and those for each region, is based on a model which aggregates across country markets and projects these to the current year.
		Combined, Chapters 3 and 4 present the complete picture for imports and exports of thyristors, diacs, and triacs excluding photosensitive devices to and from all major countries in the world.
	www.electronics.ca /reports/components/thyristors.html (831 words)

	DC Switching circuit - Patent 4394682
		Triacs, such as those used in the triac strings, are three-terminal devices which switch to a conductive state in response to the application of a signal to a gate terminal and remain in this conductive state until the gate signal is removed and the conducted current falls below a minimum holding current level.
		This causes the triacs to revert to their non-conductive state unless another pulse is applied to the gate of the triacs.
		The conducting triac string is returned to its non-conductive state during this delay time in response to the signal B decaying to a voltage insufficient to gate the selected triac string.
	www.freepatentsonline.com /4394682.html (2394 words)

	STMicroelectronics \| ST6 - MICROCONTROLLER (MCU) AND TRIACS ON THE MAINS (110/220V)
		The +5V is referred to anode 1 of the triac in o r d e r to provide the negative gate current necessary to drive the triac in quadrants QII a n d QIII.
		As a result, the triac is driven symmetrically in both phases so that continuous voltage in the transformer is avoided and noise in the transformer is reduced.
		Otherwise, the voltage across the triac is monitored to detect a spurious open load condition at the seco ndary of the transformer.
	www.st.com /stonline/books/ascii/docs/1863.htm (3567 words)

	Ortech Engineering TRIACS Family (Site not responding. Last check: 2007-09-06)
		The OEI TRIACS products are a family of compact analog and digital I/O modules that are simple and economical to install in any control system environment where distributed I/O is desirable.
		The first TRIACS modules were introduced to the petrochemical industry in 1983 to significantly reduce the installation costs of a control system by eliminating the massive wiring normally required for conventional systems.
		In contrast, only a 4-wire power/data bus is required for the TRIACS system with very minimal local wiring between the individual modules and their control points or sensors.
	www.ortech-engr.com /oei/triacs.html (261 words)

	STMicroelectronics \| NEW TRIACS: IS THE SNUBBER CIRCUIT NECESSARY?
		At turn off the commutation of the triac is the transient phase during which the load current is passing through zero and the supply voltage is reapplied to the triac terminals.
		In application the dIT/dt through the triac is not adjustable because it is given by the circuit (Va and L); its measure permits the choice of this triac with the commutation parameter, (dI/dt)c.
		We could add a saturable inductor in series with the triac when L is too low: particularly this is the case of resistive load.
	www.st.com /stonline/books/ascii/docs/6785.htm (1854 words)

	Triac Based Light Controller (Site not responding. Last check: 2007-09-06)
		I could have used relays to control my lights, but triacs seemed like a more sensible solution as they react quicker and are totally silent as they contain no mechanical parts.
		The triacs I used were also isolated tab, which means that you don't need any form of isolation between the triac and the heatsink.
		Be aware that on a standard triac one of the legs will be connected to the casing of the triac, and therefore I always recommend isolated tab.
	www.zen22142.zen.co.uk /Circuits/Switching/triacctl.htm (569 words)

	Hutson Industries, Inc. Semi Conductors
		These TRIACS are available in voltage ratings from 200 to 600 Volts (VDRM) and in power ratings up to 40 amps.
		The economical and highly reliable TRIACS are the result of Hutson’s advanced engineering and manufacturing technology, state-of-the-art passivation materials and techniques and experience in switching device applications.
		Hutson TRIACS are bi-directional TRIODE Thyristors and may be switched from off state to conduction for either polarity of applied voltage with positive or negative gate-trigger current.
	www.hutsonind.com /triacmain.shtml (135 words)

	No Subject (Site not responding. Last check: 2007-09-06)
		A suitable Vdc/---------- \ triac might be the 40 Amp 2N5445 made by /Xp \ Motorola, which costs about $5.
		On the negative half cycle of the sine wave, triacs Tm turn on during time Xm, when the AC voltage is less negative than the DC voltage, and triacs Tm turn off during the part of the cycle marked Toff, when the AC voltage becomes more negative than the DC voltage.
		The coil/choke needs to be large enough to protect the triacs from overcurrent and limit the harmonic distortion at the AC interface to less than 5%.
	ibiblio.org /london/renewable-energy/solar/general-info/msg00065.html (444 words)

	Transistors, SCRs and TRIACs
		Unlike transistors, SCR and TRIACS peak current handling is very large, with a 1 Amp rated device able to withstand 40 Amp surges.
		These are AC triggered switches, like SCR but have 2 additional junctions which are shorted together, it is a complex 3d device in practice.
		A diac (not the battery) is like a triac with internal 30v zeners anode to gate.
	www.southgatearc.org /techtips/transistors.htm (287 words)

	ALDOR Electronic Services ~ Sign Flasher / Sequence Design, Selecting the Triac Board
		.1 to 7 Amps one 10 Amp triac
		>7 Amps to 16 Amps one 20 Amp triac
		If a 20 Amp triac is needed ALDOR sells boards with 6 triacs mounted on a board.
	www.coam.net /~aldor/selecttriacbd7to32.htm (537 words)

	Crydom
		Triacs • 12A • 400V - 1000V • Isolated and non-isolated • Types: Logic level, alternistor (No snubber) and standard (Four quadrant triggering) • TO-220AB package
		Triacs • 16A • 400V - 1000V • Isolated and non-isolated • Types: Logic level, alternistor (No snubber) and standard (Four quadrant triggering) • TO-220AB package
		Triacs • 25A • 400V - 1000V • Isolated and non-isolated • Types: Logic level, alternistor (No snubber) and standard (Four quandrant triggering) • TO-220AB package
	www.crydom.com /products/productFamilyList.aspx?idProductLine=10 (384 words)

	Z0103/07/09 series; Triacs
		Passivated triacs in conventional and surface mounting packages.
		Z0103/07/09 series links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page.
		Triacs and Thyristors ST Microelectronics Cross Reference Guide(date 2005-08-01)
	www.philipsmcu.com /pip/Z0103MN.html (335 words)

	triacs (Site not responding. Last check: 2007-09-06)
		a small thermal mass.Triac, Triacs are solid state switches primarily...
		Funktionen (Kühlmaschine, usw.) erfolgt über Triacs (keine störenden Geräusche von Schützen...
		Designs and manufactures digital and analog temperature control instrumentation for applications in the process industries worldwide, ranging from plastics and packaging to food and pharmaceuticals.
	www.chemindustry.net /chemnames/T/triacs.html (232 words)

	EC&M Electrical Construction & Maintenance: Can an ohmmeter test thyristors and triacs? (Readers' Quiz) (column)@ ... (Site not responding. Last check: 2007-09-06)
		EC&M Electrical Construction & Maintenance: Can an ohmmeter test thyristors and triacs?
		Q Can I use an ohmmeter to test thyristors and triacs satisfactorily?
		If so, can someone provide a description and a sketch showing the proper hookup?
	www.highbeam.com /library/doc0.asp?DOCID=1G1:10416711&refid=ip_encyclopedia_hf (175 words)

	SCRs, triacs boast high current
		The CYNB40 and CYNB55 are available with blocking voltage ratings from 400V to 1,000V, with the CYNB55 types specifically designed for high surge current applications The CYNB55 has a surge (ITSM) rating of 700A (60Hz, full cycle).
		The new triacs are available with 30A ratings in an isolated package and 35A in a non-isolated package.
		The new CTB40 triacs offer a 40A rating in a non-isolated TO-220 package (equivalent to the ON Semiconductor MAC224 series).
	www.eetasia.com /ART_8800374560_765245_7b9db81a.HTM (238 words)

	"Manufacturer of Thyristors, Rectifiers, Diodes, Transistors and Scr's and Triacs. Igbt's and Mosfets. Mil-Prf-19500 ...
		Semitronics is a privately held manufacturer of military and commercial semiconductors, providing a full compliment of products and services from wafer fabrication to final test and assembly.
		Semitronics Manufactures High Reliability Semiconductors and as a Mil-Prf-19500 approved Manufacturer, Quality is our number one priority.
		This website has been designed for ease of navigation and to promote a clear understanding of which Thyristors, Rectifiers, Diodes, Transistors, SCR's, IGBT's, Triacs, Mosfets, and Solid State Relays Semitronics offers.
	www.semitronics.com (271 words)

	The World Market for Thyristors, Diacs, and Triacs Excluding Photosensitive Devices: A 2004 Global Trade Perspective
		The World Market for Thyristors, Diacs, and Triacs Excluding Photosensitive Devices: A 2004 Global Trade Perspective
		Sign up today for email alerts of new market research reports in your industry.
		Excerpt: On the demand side, exporters and strategic planners approaching the world market face a number of questions.
	www.marketresearch.com /researchindex/914723.html (686 words)

	Semtex Industrial a Distributor of Semiconductors and Rectifiers plus Thyristors and Bridges and SCR and diodes and ...
		Semtex Industrial Corp. is the sole Distributor for Semitronics SCR's, Solid State Relays, Thyristors, Hybrids, Diodes, Rectifiers, Mosfets, Transistors and Triacs.
		Our extensive inventory includes a large volume of obsolete Thyristors, Triacs, SCR's, Diodes, Optocouplers and Transistors and can be accessed in our website.
		We are a franchised Distributor for International Rectifer, Semitronics Corp. Powerex, EDI and Micropac Industries and Knox Semiconductor Inc.
	www.semtexindustrial.com (252 words)

	Thyristors (SCRs), triacs and trigger devices (Site not responding. Last check: 2007-09-06)
		Applicationnotes that can be found for Thyristors (SCRs), triacs and trigger devices
		Three quadrant triacs bring major benefits to OEMs
		Support documents that can be found for Thyristors (SCRs), triacs and trigger devices
	www.semiconductors.philips.com /markets/mms/products/discretes/documentation/thyristors_triacs_trigger_devices (74 words)

	Transistors, Thyristors & Triacs (Site not responding. Last check: 2007-09-06)
		Th diagram below shows pin-outs for most common transistors, thyristors (SCRs) and triacs.
		Unless otherwise stated, all show the transistor viewed from below.
		Red stars show packages commonly used for thyristors and triacs.
	www.electronics2000.co.uk /data/pinout/transist.htm (33 words)

	Discount TRIACS. Buy TRIACS cheap online @ Maplin.
		Home > Components > Semiconductors > Diodes > Triacs
		As a new customer why not take advantage of our free vouchers.
		Please note that carriage charges are based on the UK only.
	www.maplin.co.uk /noframes/19095.htm (69 words)

	Maplin > Diodes > Triacs (Site not responding. Last check: 2007-09-06)
		If a product is out of stock we will quote within 1 week, 2 weeks or 4 weeks after allowing for any possible delays.
		(Triacs) has been viewed 4382 times in the last 5 days
		Maplin brings your the best deals on products like the Garmin streetpilot i3, Gizmondo and TomTom Go 300 500 700 GPS systems.
	www.maplin.co.uk /Module.aspx?ModuleNo=19095&TabID=1 (283 words)

	Page 4. Semiconductor parts with 600 in root number
		GPS RF FRONT-END IC Snubberless triac, 12A, 600V
		600V Vdrm 6A Triac, 1.5V Peak On-State Voltage, 1.0mA Repetitive Peak Off-State Current
		600V Vdrm 8A Triac, 1.4V Peak On-State Voltage, 2.0mA Repetitive Peak Off-State Current
	www.chipdocs.com /pndecoder/number/600-4.html (720 words)

	Page 2. Semiconductor parts with 134 in root number
		ST70134 - ST70135A - ASCOT ADSL MODEM CHIP SET FOR CPE
		600V Vdrm 4A Triac, 1.7V Peak On-State Voltage, 0.5mA Repetitive Peak Off-State Current
		Small signal switching diode for general purpose applications
	www.chipdocs.ru /pndecoder/number/134-2.html (1014 words)

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