E L E C T R O N I C L054BT26 Low Capacitance Surface Mount TVS Diodes FEATURES • Four ultra-low input capacitance ( 1 pF typ.) ESD rail-to-rail protection diodes • ESD IEC 61000-4-2 level 4, ± 8kV contact Discharge compliant protection • Low voltage clamping due to integrated Zener diode • Compact SOT-23-6 package APPLICATION General-purpose downstream ESD protection high frequency analog signals and high-speed serial data transmission for ports inside: • PC-/Notebook USB2.0/IEEE1394 ports • Cellular phone and PCS mobile handsets • DVI interfaces • Cordless telephones • Wireless data (WAN/LAN) systems • PDAs The L054BT26 devices are low-capacitance transient voltage suppressors designed to protect components which are connected to data and transmission lines from over voltages caused by electrostatic discharge (ESD), electrical fast transients (EFT), and induced lightning. SCHEMATIC & PINNING (SOT23-6) CIRCUIT DIAGRAM MAXIMUM RATINGS SYMBOL MIN MAX UNIT DC input voltage range RATING VI/O 0 +5.5 Volts Electrostatic Discharge, all pins (IEC 61000-4-2, Level 4, Contact) ESD -8 +8 KiloVolts Device Storage Temperature Tstg -55 +125 ELECTRICAL CHARACTERISTICS PARAMETER Pin capacitance to ground, Pins 1, 3, 4, 6 Diode reverse leakage current, Pins 1, 3, 4, 6 to ground Zener diode capacitance to ground, Pin 5 to 2 Zener diode breakdown voltage, Pin 5 to 2 Forward voltage o C o TC = 25 C unless otherwise specified TEST CONDITIONS SYMBOL MIN TYP MAX UNIT Vdc = 0V; f = 1 MHz Pin 5 = +3.0V CI/O - 1.0 - pF V = +3.0V Ilkg - - 100 nA Vdc = 0V; f = 1 MHz Pin 5 = +3.0V CZener - 40 - pF I = 1mA VBR I/O 6 - 9 V VF - 0.7 - V August 2007 / Rev.5 http:// www.sirectsemi.com L054BT26 http:// www.sirectsemi.com L054BT26 APPLICATION INFORMATION 1.0 Four High-Speed Data Lines Protection The L054BT26 TVS diode is designed to protect up to four data lines from transient over-voltages by clamping them to a fixed reference. When the voltage on the protected line(s) exceeds the reference voltage (plus diode VF), the steering diodes are forward biased, conducting the transient current away from the protected circuitry. The data lines are connected to pins 1, 2, 4 and 6. The negative reference (REF1) is connected to pin 2 (This pin should be connected directly to the ground plane on the PCB for best results). The path length is kept as short as possible to minimize parasitic inductance. The positive reference (REF2) is connected to pin 5. The typical options for connecting the positive reference are as follows: A. DATA LINE AND POWER SUPPLY PROTECTION USING VCC AS REFERENCE To protected data lines and the power line, connect pin 5 directly to the positive supply rail (VCC). In this configuration, the data lines are referenced to the supply voltage. The internal TVS diode prevents over-voltage on the supply rail. http:// www.sirectsemi.com L054BT26 APPLICATION INFORMATION (continued) B. DATA LINE PROTECTION WITH BIAS AND POWER SUPPLY ISOLATION RESISTOR The L054BT26 can be isolated from the power supply by adding a series resistor between pin 5 and VCC (A resistor value of 100kΩ is recommended). The internal TVS and steering diodes remain biased, providing the advance of even lower capacitance. C. DATA LINE PROTECTION USING INTERNAL TVS DIODE AS REFERENCE In applications where no positive supply reference is available, or complete supply isolation is desired, the internal TVS may be used as the reference. In this case, pin 5 is not used. The steering diodes will begin to conduct when the voltage on the protected line exceeds the working voltage of the TVS (plus one diode drop). http:// www.sirectsemi.com L054BT26 APPLICATION INFORMATION (continued) 2.0 Universal Serial Bus (USB) ESD Protection The L054BT26 can be used to protect the USB ports on mobile phones, monitors, PCs, peripherals and other portable systems (please refer to schematic diagram below). In typical applications, the voltage bus (VBUS) of USB ports are connected to the power pin (pin 5) of the device. Each data line (D+/D-) of the USB ports is connected to the ESD protection pin of the device. When an electrostatic discharge (ESD) pulse appears on the data line, the ESD pulse current will be conducted by the L054BT26 away from the USB controller chip. In addition, the ESD pulse current can also be conducted by the device away from the USB controller chip when the ESD voltage pulse appears on the voltage bus (VBUS) of any of the USB ports. Therefore, the data lines (D+/D-) and voltage bus (VBUS) of the two USB ports are complementally protected with the L054BT26 device. Typical Universal Serial Bus 2.0 Serial Application of the L054BT26 http:// www.sirectsemi.com L054BT26 APPLICATION INFORMATION (continued) 3.0 Audio interface ESD Protection Another typical application of the L054BT26 is ESD protection of the Right/Left channel and TMC terminals of an audio interface. Referring to the schematic diagram below, the Right and Left channels of the audio connector are connected to the ESD protection pins (such as pin 1 and pin 6) of the L054BT26. In addition, the TMC terminals of the audio connector are also connected to the ESD protection pins (such as pin 3 and pin 4) of the device. Regarding the power pin (pin 5) of the device, this should be directly connected to the VDD power supply. In this configuration, when an electrostatic discharge (ESD) voltage pulse appears on the Right or Left channel or TMC terminals of audio connector, the ESD pulse current will automatically be discharged by by the L054BT26. Therefore, the Right/Left channel and TMC terminals of the audio chip are complementally protected with an L054BT26 device. Typical Audio Interface Application of the L054BT26 http:// www.sirectsemi.com L054BT26 APPLICATION INFORMATION (continued) 4.0 Other Applications DVI/HDMI Digital Single Link ESD Protection T1/E1/Ethernet ESD Protection http:// www.sirectsemi.com L054BT26 PACKAGE DRAWING MARKING CODES Part Number Marking Code L054BT26 5V4 Sirectifier Global Corp., Delaware, U.S.A. U.S.A.: [email protected] France: [email protected] Taiwan: [email protected] Hong Kong: [email protected] China: [email protected] …Thailand: [email protected] Philippines: [email protected] Belize: [email protected] http:// www.sirectsemi.com