1、 LOW CAPACITANCE TVS DIODE ARRAY Features Ultra low leakage:nA levelOperating voltage:5VLow clamping voltageComplies with following standards:IEC 61000-4-2(ESD)immunity testAir discharge:20kV Contact discharge:20kV IEC61000-4-4(EFT)40A(5/50ns)IEC61000-4-5(Lightning)5A(8/20 s)RoHS CompliantApplicatio
2、ns USB 2.0 power and data lineSet-top box and digital TVDigital video interface(DVI)Notebook ComputersSIM Ports10/100/1000 Ethernet Dimensions SOT-26 Pin Configuration Mechanical Characteristics Package:SOT-26Lead Finish:Lead FreeUL Flammability Classification Rating 94V-0Quantity Per Reel:3,000pcsR
3、eel Size:7inchAbsolute Maximum Ratings(Tamb=25C unless otherwise specified)Parameter Symbol Value Unit Peak Pulse Power(8/20s)Ppp350WESD per IEC 6100042(Air)VESD 20KvESD per IEC 6100042(Contact)20 Operating Temperature Range TJ-55 to+125 Storage Temperature Range TSTJ-55 to+150 Rev:01.06.2014 1/7AEC
4、-Q101 qualified.Device Marking:V05 RLST236A054LVElectrical Characteristics(TA=25C unless otherwise specified)Characteristic Curves Fig1.8/20s Pulse Waveform051015202530120tr100806040200Peak Value IPPtd=t IPP/2TESTWAVEFORMPARAMETERStr=8 std=20 st-Time(s)IPP-Peak Pulse Current-%of IPPFig3.Power Derati
5、ng Curve0255075100125150110100403020100%of Rated Power9080706050Ambient Temperature TA(C)Fig2.ESD Pulse Waveform(according to IEC 61000-4-2)60ns10%Percent of Peak Pulse Current%30nstr=0.71nsTime(ns)90%100%Rev:01.06.2014 2/7Parameter Symbol Min Typ Max Unit Test Condition Reverse Working Voltage VRWM
6、 5 V Breakdown Voltage VBR 6 V IT=1mA Reverse Leakage Current IR 1 A VRWM=5V Clamping Voltage VC 15 V IPP=1A(8 x 20 s pulse)Clamping Voltage VC 28 V IPP=5A(8 x 20 s pulse)Junction Capacitance CJ 0.5 pF V =0V,f=1MHz RRLST236A054LV Figure 1.Data Line and Power Supply Protection Using VCC as reference
7、Figure 2.Data Line Protection with Bias and Power Supply Isolation Resistor Figure 3.Data Line Protection Using Internal TVS Diode as Reference Device Connection Options for Protection of Four High-Speed Data Lines The RLST236A054LV is designed to protect four data lines from transient over-voltages
8、 by clamping them to a fixed reference.When the voltage on the protected line exceeds the reference voltage(plus diode VF)the steering diodes are forward biased,conducting the transient current away from the sensitive circuitry.Data lines are connected at pins 1,3,4 and 6.The negative reference(REF1
9、)is connected at pin 2.This pin should be connected directly to a ground plane on the board for best results.The path length is kept as short as possible to minimize parasitic inductance.The positive reference(REF2)is connected at pin 5.The options for connecting the positive reference are as follow
10、s:1.To protect 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(See Figure1).2.The RLST236A054LV can be isolated from the pow
11、er supply by adding a series resistor between pin 5 and VCC.A value of 100k is recommended.The internal TVS and steering diodes remain biased,providing the advantage of lower capacitance(See Figure2).3.In applications where no positive supply reference is available,or complete supply isolation is de
12、sired,the internal TVS may be used as the reference.In this case,pin 5 is not connected.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)(See Figure3).Applications Information Rev:01.06.2014 3/7 RLST236A054LVF
13、igure 4Video Interface Protection Figure 5-Dual USB Port Protection Figure 6-SIM Port Video Interface Protection Video interfaces are susceptible to transient voltages resulting from electrostatic discharge(ESD)and“hot plugging”cables.If left unprotected,the video interface IC may be damaged or even
14、 destroyed.Protecting a high-speed video port presents some unique challenges.First,any added protection device must have extremely low capacitance and low leakage current so that the integrity of the video signal is not compromised.Second,the protection component must be able to absorb high voltage
15、 transients without damage or degradation.As a minimum,the device should be rated to handle ESD voltages per IEC61000-4-2,level 4(15kV air,8kV contact).The clamping voltage of the device(when conducting high current ESD pulses)must be sufficiently low enough to protect the sensitive CMOS IC.If the c
16、lamping voltage is too high,the“protected”device may latch-up or be destroyed.Finally,the device must take up a relatively small amount of board space,particularly in portable applications such as notebooks and handhelds.The RLST236A054LV is designed to meet or exceed all of the above criteria.A typ
17、ical video interface protection circuit is shown in Figure 4.All exposed lines are protected including R,G,B,H-Sync,V-Sync,and the ID lines for plug and play monitors.Universal Serial Bus ESD Protection The RLST236A054LV may also be used to protect the USB ports on monitors,computers,peripherals or
18、portable systems.Each device will protect up to two USB ports(Figure5).When the voltage on the data lines exceed the bus voltage(plus one diode drop),the internal rectifiers are forward biased conducting the transient current away from the protected controller chip.The TVS diode directs the surge to
19、 ground.The TVS diode also acts to suppress ESD strikes directly on the voltage bus.Thus,both power and data pins are protected with a single device.SRV05-4 SRV05-4 SRV05-4 SRV05-4 Applications Information(Continue)Applications Information (Continue)Rev:01.06.2014 4/7RLST236A054LVFigure 7 shows how
20、to design the RLST236A054LV into the DVI circuit on a flat panel display and a PC graphic card.The RLST236A054LV is configured to provide common mode and differential mode protection.The internal TVS of the RLST236A054LV acts as a 5 volt reference.The power pin of the DVI circuit does not come out t
21、hrough the connector and is not subjected to external ESD pulse;therefore,pin 5 should be left unconnected.Connecting pin 5 to Vcc of the DVI circuit may result in damage to the chip from ESD current.10/100 ETHERNET PROTECTION Ethernet ICs are vulnerable to damage from electro-static discharge(ESD).
22、The internal protection in the PHY chip,if any,often is not enough due to the high energy of the discharges specified by IEC 61000-4-2.If the discharge is catastrophic,it will destroy theprotected IC.If it is less severe,it will cause latent failures that are very difficult to find.10/100 Ethernet o
23、perates at 125MHz clock over a twisted pair interface.In a typical system,the twisted-pair interface for each port consists of two differential signal pairs:one for the transmitter and one for the receiver,with the transmitter input being the most sensitive to damage.The fatal discharge occurs diffe
24、rentially across the transmit or receive line pair and is capacitively coupled through the transformer to the Ethernet chip.Figure 8 shows how to design the RLST236A054LV on the line side of a 10/100 ethernet port to provide differential mode protection.The common mode isolation of the transformer w
25、ill provide common mode protection to the rating of the transformer isolation which is usually 1.5kV.If more common mode protection is needed,figure 9 shows how to design the RLST236A054LV on the IC side of the 10/100.Figure 7.Digital Video Interface(DVI)Protection Applications InformationDVI Protec
26、tion The small geometry of a typical digital-visual interface(DVI)graphic chip will make it more susceptible to electrostatic discharges(ESD)and cable discharge events(CDE).Transient protection of a DVI port can be challenging.Digital-visual interfaces can often transmit and receive at a rate equal
27、to or above 1Gbps.The high-speed data transmission requires the protection device to have low capacitance to maintain signal integrity and low clamping voltage to reduce stress on the protected IC.The RLST236A054LV has a low typical insertion loss of 0.4dB at 1GHz(I/O to ground)to ensure signal inte
28、grity and can protect the DVI interface to the 8kV contact and 15kV air ESD per IEC 61000-4-2 and CDE.(Continue)Applications Information (Continue)Rev:01.06.2014 5/7RLST236A054LVRev:01.06.2014 Figure 8-10/100 Ethernet Differential Protection Figure 9-10/100 Ethernet Differential and Common Mode Prot
29、ection Applications Information(Continue)Applications Information (Continue)6/7 RLST236A054LVShanghai Leiditech Electronic Co.,Ltd Email: Tel:+86-021 50828806 Fax:+86-021 50477059 Rev:01.06.2014 Inches Millimeters Symbol Min.Nom.Max.Min.Nom.Max.A 0.035-0.057 0.90-1.45 A1 0.000-0.006 0.00-0.15 A2 0.0
30、35 0.045 0.051 0.90 1.15 1.30 b 0.010-0.020 0.25-0.50 c 0.003-0.009 0.08-0.22 D 0.110 0.114 0.122 2.80 2.90 3.10 E1 0.060 0.063 0.069 1.50 1.60 1.75 E 0.110 BSC 2.80 BSC e 0.037 BSC 0.95 BSC e1 0.075 BSC 1.90 BSC L 0.012 0.018 0.024 0.30 0.45 0.60 L1(0.024)(0.60)0-10 0-10 aaa 0.004 0.10 bbb 0.008 0.20 ccc 0.008 0.20 Symbol Inches Millimeters C(0.098)(2.50)G 0.055 1.40 P 0.037 0.95 X 0.024 0.60 Y 0.043 1.10 Z 0.141 3.60 Soldering Footprint SOT-26 Package Outline&Dimensions 7/7RLST236A054LV
