Bidirectional Thyristor (TRIAC) - Unitshine Semiconductor

unitshine-thyristor-bidirectional

Bidirectional Thyristor is the derivative of the thyristor module also known as the SCR rectifier. The thyristor is structurally a PNPN four-layer semiconductor,with three poles: Anode, Cathode and Gate. Thyristor shall work when positive voltage is exerted and gate pole has a trigger current. Its derivative devices are fast thyristor, two-way thyristor, reverse thyristor and light control thyristor etc, and marked in the circuit with the text symbol "V" or "VT" (or "SCR" in old standard).

Bidirectional Thyristor Flat type is a semiconductor device made of five-layer of N-P-N-P-N, and three electrodes are drawn outward, and the structure is shown in the figure. The TRIAC is equivalent to the reverse parallel connection of two single-directional thyristors, but with only one control pole.

Features

Our Bidirectional Thyristors possess the following features:

Diffusion technology.
Flat type metal-ceramic packages with pressure contacts.
Double-side cooling.
Amplifying gates in center.

Application & Specification

Application

Bidirectional Thyristors are widely used in the following fields:

Contactless switches.
Adjustment and control for AC power supply.
Electrothermal equipment.

Specification

Type	I_T（AV） @T_C		V_DRM V_RRM	I_DRM I_RRM	V_TM @I_TM		I_GT	V_GT	dv/dt	di/dt	I_TSM	I²t	V_TO	r_T	R_thjc	R_thch	T_JM	Fig.
				125°C	25°C				125°C		10ms		125°C
	A	℃	V	mA	V	A	mA	V	V/μS	A/μS	KA	kA²s	V	mΩ	℃/W	℃/W	℃
TC133-320	320	85	600-1800	30	2.6	500	200	2.5	50	50	2.5	32	1.05	1.8	0.065	0.01	125	T08
TC233-500	500	85	600-1800	30	2.65	800	200	2.5	50	50	4.5	100	1.05	1.1	0.045	0.001	125	T09
TC143-630	630	85	600-1800	30	2.65	800	200	2.5	50	50	4.5	100	1.1	0.99	0.045	0.01	125	T09
TC243-800	800	85	600-1800	40	2.75	1200	250	3	50	50	7	245	0.98	0.86	0.038	0.01	125	T11
TC243-1000	1000	85	600-1800	70	2.6	1500	250	3	50	50	10	500	0.97	0.78	0.035	0.008	125	T12

Installation Precautions

The modules should be installed and commissioned by an operator with relevant electric, electronic and electrical qualification:

Considering the fluctuation of the grid voltage, the current of load is generally several times larger than its rated current at the start while the thyristor chip is less resistant to current shock, it is recommended that you set the appropriate margin when selecting electric current specifications of the modules.
Module chip's working temperature: -40 ℃ ∽ 125 ℃ for SCR; ambient temperature shall not be higher than 40 ℃; environmental humidity shall be less than 86%.
The environment should be no severe vibration and shock where there should be no metal with corrosion and impurities & air that damagesg the insulation.
For thyristor module ise insulated type (meaning insulation resistance between the module terminals and the copper bottom plate is greater than 2.5KV), multiple modules can be mounted on the same heat sink, with earthing wire.
The installation surface of a radiator should be evenly flat, smooth and without scratches, bumps and debris, and surface finish of the radiator should be less than 10μm.
When power modules are mounted on the radiator, a thin layer of thermal grease should be applied between the contact surfaces. Before grease applying, please remove the oxide layer of the radiator contact surface with fine sandpaper, then wipe the surface with absolute ethanol, so that the contact is good enough to reduce the thermal resistance.
When a module is fastened to the surface of the radiator, please use M5 or M6 screws and spring washers then tighten the screws with 4NM torque.
The connection with main electrodes of the modules should be copper busbars with a smooth surface and good contact. After the modules have been in operation for 3 hours, the screws must be tightened again.

Our team is in dedicate and professional position to provide above information for our customers and related operators to properly deal with what we supply to all over the world. You are welcome to contact us to get such information or data, and please address This email address is being protected from spambots. You need JavaScript enabled to view it.

Bidirectional Thyristor (Flat Type)

Application