Electronic Components Datasheet Search |
|
NP0640SBMCT3G Datasheet(PDF) 5 Page - ON Semiconductor |
|
NP0640SBMCT3G Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 7 page NP−SBMC Series http://onsemi.com 5 TIME (ms) 0 50 0 100 tr = rise time to peak value tf = decay time to half value tr tf Peak Value Half Value 1 10 100 0.1 1 10 100 1000 Figure 2. Nonrepetitive On−State Current vs. Time (ITSM) Figure 3. Nonrepetitive On−State Impulse vs. Waveform (IPPS) CURRENT DURATION (s) Detailed Operating Description The TSPD or Thyristor Surge Protection Device are specialized silicon based overvoltage protectors, used to protect sensitive electronic circuits from damaging overvoltage transient surges caused by induced lightning and powercross conditions. The TSPD protects by switching to a low on state voltage when the specified protection voltage is exceeded. This is known as a “crowbar” effect. When an overvoltage occurs, the crowbar device changes from a high−impedance to a low−impedance state. This low−impedance state then offers a path to ground, shunting unwanted surges away from the sensitive circuits. This crowbar action defines the TSPD’s two states of functionality: Open Circuit and Short Circuit. Open Circuit – The TSPD must remain transparent during normal circuit operation. The device looks like an open across the two wire line. Short Circuit – When a transient surge fault exceeds the TSPD protection voltage threshold, the devices switches on, and shorts the transient to ground, safely protecting the circuit. Figure 4. Normal and Fault Conditions Protected Equipment + − + − V(OP) I(OP) TSPD Normal Circuit Operation Protected Equipment + − + − V(Fault) I(Fault) TSPD Operation during a Fault I(Fault) •TSPD looks like an open •Circuit operates normally •Fault voltage greater than Vbo occurs •TSPD shorts fault to ground •After short duration events the O/V switches back to an open condition •Worst case (Fail/Safe) •O/V permanent short •Equipment protected The electrical characteristics of the TSPD help the user to define the protection threshold for the circuit. During the open circuit condition the device must remain transparent; this is defined by the IDRM. The IDRM should be as low as possible. The typical value is less than 5 mA. The circuit operating voltage and protection voltage must be understood and considered during circuit design. The V(BO) is the guaranteed maximum voltage that the protected circuit will see, this is also known as the protection voltage. The VDRM is the guaranteed maximum voltage that will keep the TSPD in its normal open circuit state. The TSPD V(BO) is typically a 20−30% higher than the VDRM. Based on these characteristics it is critical to choose devices which have a VDRM higher than the normal circuit operating voltage, and a V(BO) which is less than the failure threshold of the protected equipment circuit. A low on−state voltage Vt allows the TSPD to conduct large amounts of surge current (500 A) in a small package size. Once a transient surge has passed and the operating voltage and currents have dropped to their normal level the TSPD changes back to its open circuit state. |
Similar Part No. - NP0640SBMCT3G |
|
Similar Description - NP0640SBMCT3G |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |