Results for: BD490
in Thyristors
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Thyristors
A thyristor is a solid-state semiconductor device with four layers of alternating N and P-type material. They act exclusively as bistable switches, conducting when their gate receives a current trigger, and continue to conduct while they are forward biased (that is, while the voltage across the device is not reversed). A three-lead thyristor is designed to control the larger current of its two leads by combining that current with the smaller current or voltage of its other lead - known as its control lead. In contrast, a two-lead thyristor is designed to 'switch on' if the potential difference between its leads is sufficiently large - a value representing its breakdown voltage. Some sources define silicon-controlled rectifiers and thyristors as synonymous. Other sources define thyristors as a larger set of devices with at least four layers of alternating N and P-type material. The first thyristor devices were released commercially in 1956. Because thyristors can control a relatively large amount of power and voltage with a small device, they find wide application in control of electric power, ranging from light dimmers and electric motor speed control to high-voltage direct current power transmission. Thyristors may be used in power-switching circuits, relay-replacement circuits, inverter circuits, oscillator circuits, level-detector circuits, chopper circuits, light-dimming circuits, low-cost timer circuits, logic circuits, speed-control circuits, phase-control circuits, etc. Originally thyristors relied only on current reversal to turn them off, making them difficult to apply for direct current; newer device types can be turned on and off through the control gate signal. A thyristor is not a proportional device like a transistor. In other words, a thyristor can only be fully on or off, while a transistor can lie in between on and off states. This makes a thyristor unsuitable as an analog amplifier, but useful as a switch.
Transistor > Thyristors > FET Transistors > MOSFET
Part No. Variations
- BD490
- BD4904FME2
- BD4908FM
- BD4908FME2
- BD49101AEFSM
- BD4911FME2
- BD4912V4
- BD4917ZIP
- BD49191EME2
- BD4923FVETR
- BD4923G
- BD4923GTR
- BD4924FVETR
- BD4925FVE
- BD4925GTR
- BD4926GTR
- BD4927FVETR
- BD4927G
- BD4927GTR
- BD4928GTR
- BD4929FVETR
- BD4929G
- BD4929GTR
- BD4930FVETR
- BD4931FVEGTR
- BD4931FVETR
- BD4933FVETR
- BD4933GTR
- BD4934GTR
- BD4935FVETR
- BD4936GTR
- BD4937FVETR
- BD4938FVE
- BD4938FVETR
- BD4939FVETR
- BD4939GTR
- BD4940FVETR
- BD4940GTR
- BD4941FVE
- BD4942FVETR
- BD4943G
- BD4943GTR
- BD4944FVETR
- BD4944G
- BD4945FVETR
- BD4945GTR
- BD4946FVE
- BD4946FVETR
- BD4949FVE
- BD4950GTR
- BD4951G
- BD4954FVE
- BD4957FVE
- BD4957GTR
- BD4958FVETR
- BD4958G
- BD49K23GTL
- BD49K27GTL
- BD49K30GTL
- BD49K33GTL
- BD49K37GTL
- BD49K60GTL
- BD49L25GTL
- BD49L27GTL
- BD49L30GTL
- BD49L40GTL
- BD49L45GTL
- BD49L49GTL
- BD49L55GTL
- BD49L60GTL