WEET How and What About TVS (Transient Voltage Suppressors) Diodes Knowledge
TVS (Transient Voltage Suppressors) diodes, that is, transient voltage suppressors, also known as avalanche breakdown diodes, are single PN junction or multiple PN junction integrated devices made by semiconductor processes. There are unidirectional and bidirectional TVS diodes. Unidirectional TVS diodes are generally used in DC power supply circuits, and bidirectional TVS diodes are used in voltage alternating circuits. When applied to a DC circuit, a unidirectional TVS diode is connected in reverse in parallel to the circuit. When the circuit works normally, the TVS diode is in the off state (high-impedance state), which does not affect the normal operation of the circuit. When the circuit has an abnormal overvoltage and reaches the TVS diode breakdown voltage, the TVS diode quickly changes from a high-resistance state to a low-resistance state, releasing the transient overcurrent caused by the abnormal overvoltage to the ground, and clamping the abnormal overvoltage to Low level, thus protecting the post-stage circuit from abnormal overvoltage. When the abnormal overvoltage disappears, the resistance of the TVS diode returns to a high-impedance state.
First, TVS diode products supplied by WEET can be classified from the package types:
• SMA/DO-214AC：P4SMA6.8CA THRU P4SMA250CA, SMAJ5.0CA THRU SMAJ440CA
• SMB/DO-214AA：P6SMB6.8CA THRU P6SMB250CA, SMBJ5.0CA THRU SMBJ440CA
• SMC/DO-214AB：SMDJ5.0CA THRU SMDJ170CA, SMCJ5.0CA THRU SMCJ440CA
• SOD-123FL：SMF5.0CA THRU SMF220CA
• DO-41：P4KE6.8CA THRU P4KE440CA
• DO-15：P6KE6.8CA THRU P6KE600CA
• DO-27：1.5KE6.8CA THRU 1.5KE440CA
Second Part: What do TVS diode characteristics stand for ?
• Made of semiconductor technology, with high reliability and no damage limit;
• Glass passivation process, accurate on-voltage;
• Large transient power, low capacitance, low leakage current, easy to control clamping voltage;
• Fast response time: usually less than 1.0PS;
• Excellent clamping ability and small breakdown voltage deviation;
• High voltage accuracy, in special applications, higher accuracy can be achieved through process or parameter screening;
• Small size and easy installation;
• unidirectional and bidirectional units;
• Transient power can reach 200W-30000W or even higher under 10 / 1000μs waveform;
• Working voltage range 3.3V ~ 600V, or even higher;
• Diversified package formats
SMD package: SOD-123, SMA / DO-214AC, SMB / DO-214AA, SMC / DO-214AB, DO-218AB, etc.
In-line package: DO-41, DO-15, DO-201, etc .;
• Halogen-free and RoHS compliant;
