R8530 92700 Features Applications n Dual channel protector for RS-485 interfacesn RS-485 interface surge protection n Aids compliance to IEC 61000-4-2 (ESD), n AISG (Antenna Interface Standards Group) IEC 61000-4-4 (EFT) and IEC 61000-4-5 modem protection (Surge) standards n Fast protection response time (1 s) n RoHS compliant* TBU-RSxxx-300-WH - TBU High-Speed Protector General Information Functional Block Diagram Bourns Model TBU-RSxxx-300-WH Series is an integrated dual channel Pin Pin Transient Blocking Unit (TBU) overcurrent device and TVS overvoltage 7 5 protector for the RS-485 communications interface. When coupled with an Media B Transceiver B (MB) (TB) overvoltage protector like the Bourns GDT (Model 2030-42T-SM-RPLF) or Pin TISP Thyristor Surge Protector (Model TISP4350J3BJR-S), the integrated 4 LINE TBU Device GND solution aids compliance to IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT) and PHY IEC 61000-4-5 (Surge) standards (see Application section). Apart from a Pin Pin reduction in the number of components used, there is also a savings of 1 3 52 % in board space when compared to a discrete solution. Media A Transceiver A (MA) (TA) The Model TBU-RSxxx-300-WH Series is available in a DFN package and meets industry standards such as RoHS and Pb-free solder reflow profiles. Absolute Maximum Ratings ( T = 25 C Unless Otherwise Noted) A Symbol Parameter Part Number Value Unit TBU-RS055-300-WH 550 +/- MA to TA or +/- MB to TB V V imp TBU-RS085-300-WH 850 Peak impulse voltage withstand with duration less than 10 ms TBU-RS055-300-WH 250 +/- MA to TA or +/- MB to TB with GND floating V V rms TBU-RS085-300-WH 425 Continuous A.C. RMS voltage T Operating temperature range -55 to +125 C op T Maximum ambient temperature +125 C amax ESD ESD protection per IEC 61000-4-2 - Contact discharge 2 kV V Maximum working voltage (Line to PHY or reverse) 12 or -7 V WM Electrical Characteristics ( T = 25 C Unless Otherwise Noted) A Pin Symbol Description Part Number Min. Typ. Max. Unit Configuration I Current required for the device to go from operating state to protected state 300 450 600 mA trigger Voltage below which the triggered TBU device will transition to normal V 12 16 20 V reset operating state Line to PHY I Current through the triggered TBU device with 50 Vdc voltage 0.5 mA Q or Reverse TBU-RS055-300-WH 6 10 14 R On resistance of the TBU device device TBU-RS085-300-WH 15 21.5 26 t Time for the device to go from normal operating state to protected state 1 s block 13.3 V Minimum breakdown voltage 1 mA V BR -7.5 1 I Leakage current V A D WM 20 PHY T 19 A/B V Maximum clamping voltage 1 A V c -11 to GND 20 or V Maximum clamping voltage 5 A (8/20 pulse) V c -12 Reverse 26 V Maximum clamping voltage 17 A (8/20 pulse) V c -14 Typical Junction Capacitance, C 95 pF D V = 30 mV, V = 0 V, Osc. Frequency = 1 MHz OSC bias Environmental Specifications WARNING Cancer and Reproductive Harm www.P65Warnings.ca.gov Moisture Sensitivity Level ................................................................1 *RoHS Directive 2015/863, Mar 31, 2015 and Annex. ESD Classification (HBM) ................................................................2 Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. TBU-RSxxx-300-WH Series - TBU High-Speed Protector Device Description TBU-RSxxx-300-WH TBU 2 PHY 7 5 TVS B DIODE RO RE PRIMARY 4 PROTECTOR A DI LINE IN 3 1 DE CONNECTOR TBU 1 RS-485 interfaces are popular in industrial and communication applications due to their high immunity to noise. However, RS-485 interface PHYs are subject to damage by threats such as inductive transients, environmental, and lightning surges commonly found in industrial and communication installations. These threats must be taken into consideration in the design stage of the RS-485 link. Bourns TBU-RSxxx-300 is a highly integrated and fast RS-485 interface protector that can be used with external overvoltage devices like a GDT or thyristor to deliver IEC 61000-4-5 Class 4 protection. As shown in the above figure, the device integrates two TBU HSPs (click here for more information on TBU HSPs) and a pair of TVS diodes to provide a total RS-485 interface protection solution in a small footprint. Device Operation In normal operation, the TBU-RSxxx-300 devices TBU HSP exhibits low impedance and the TVS Diode exhibits high impedance which has a minimal impact on circuit operation. When a surge is detected at the RS-485 interface and the surge voltage is above the breakdown voltage (V ) of the TVS Diode, the devices TVS diode will break down, protecting the RS-485 PHY interface by providing BR a low impedance path to ground. As the surge current increases above the TBU HSPs trigger current level (I ), the TBU HSP trigger will turn off immediately, thereby blocking the surge energy in less than 1 s (typical). During the remainder of the surge, the TBU- RSxxx-300 device remains in the protected blocking state, consuming low quiescent current (I , 0.5 mA). Q The device will start its reset process at the end of a surge event the TBU HSP will begin the reset process when the voltage across the device drops below the V level and will complete the reset process when the signal line returns to its normal operating range. reset Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.