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Overvoltage Protection
Power Thyristors
Product Category
Diacs
A diac semiconductor is a full-wave or bidirectional thyristor. It istriggered from a blocking state to a conduction state for either
polarity of applied voltage whenever the amplitude of applied
voltage exceeds the breakover voltage rating of the diac.
Quadrac
Teccor's Quadrac devices are triacs that include a diac Power 
Thyristorstriggermounted inside the same package. This device, developed by Teccor, save the user the expense and assembly timeof buying a discrete diac and assembling in conjunction with a gated triac. Also, the alternistor Quadrac device (QxxxxLTH) eliminates the need for a snubber network.
Rectifiers
Teccor manufactures 15 A rms to 25 A rms rectifiers with voltages
rated from 200 V to 1000 V. Due to the electrically-isolated
TO-220 package, these rectifiers may be used in common anode
or common cathode circuits using only one part type, thereby
simplifying stock requirements.
SCR Devices
The Teccor line of thyristor SCR semi-conductors are half-wave,
unidirectional, gate-controlled rectifiers which complement Teccor's
line of sensitive SCRs. Teccor offers devices with ratings of
1 A to 70 A and 200 V to 1000 V, with gate sensitivities from
10 mA to 50 mA. If gate currents in the 12 μA to 500 μA ranges
are required, see "Sensitive SCRs" section of this catalog.
SIDAC
The sidac is a silicon bilateral voltage triggered switch with greater power-handling capabilities than standard diacs. Upon application of a voltage exceeding the sidac breakover voltage point, the sidac switches on through a negative resistance region to a low on-state voltage. Conduction continues until the current is interrupted or drops below the minimum holding current of the device.
Triac
Teccor offers bidirectional alternistors with current ratings from
6 A to 40 A and voltages from 200 V to 1000 V as part of Teccor's broad line of thyristors. Teccor's alternistor is specifically designed for applications that switch highly inductive loads.
A special chip offers the same performance as two thyristors
(SCRs) wired inverse parallel (back-to-back), providing better
turn-off behavior than a standard triac. An alternistor may be triggered from a blocking to conduction state for either polarity of
applied AC voltage with operating modes in Quadrants I, II,
and III.