CDSOT236-DSL03xx - TVS Diode Array Series

Transcription

1 *RoHS COMPLIANT Features RoHS compliant* Low capacitance < pf ESD protection Surge protection Applications ADSL / DSL cards Personal Digital Assistants (PDAs) Mobile phones and accessories Portable electronics CDSOT236-DSL3xx - TS Diode Array Series General Information The CDSOT236-DSL3xx device provides ESD, EFT and surge protection for highspeed data ports to assist in meeting IEC (ESD), IEC (EFT) and IEC 6-4- (Surge) requirements. The Transient oltage Suppressor array is available with a Working Peak Reverse oltage of 12 or 24. REF REF REF The SOT23-6L packaged device will mount directly onto the industry standard SOT23-6L footprint and is easy to handle with standard pick and place equipment. I/O 1 GND I/O 2 Absolute Maximum Ratings, T A = 2 C (Unless Otherwise Noted) Rating Symbol CDSOT236- DSL312 DSL324 Unit Working Peak oltage WM Peak Pulse Current (t p = 8/ µs) I PPM 3 1 A Peak Pulse Power (t p = 8/ µs) P PP W ESD (IEC6-4-2 Contact) 8 k ESD (IEC6-4-2 Air) 1 k Operating Temperature T L -4 to +12 C Storage Temperature T STG - to +1 C Electrical Characteristics, T A = 2 C (Unless Otherwise Noted) Parameter Test Condition (Note 1) Min. Typ. Max. Unit BR Breakdown oltage I BR = 1 ma C Clamping oltage I P = 1 A, 8/ µs C Clamping oltage I P = A, t w = 1 µs C Clamping oltage I P = 3 A, 8/ µs I P = 1 A, 8/ µs I D Leakage Current D = WM na C Capacitance D = 1, f = MHz, 1 rms 1.4 pf ΔC Capacitance ariation D = 1 to WM, f = MHz, 1 rms.2 2 pf Note 1: All measurements made between I/O 1 and I/O *RoHS Directive 2/9/EC Jan. 27, 3 including annex and RoHS Recast 11/6/EU June 8, 11.

2 CDSOT236-DSL3xx - TS Diode Array Series Performance Graphs Maximum Current vs. Pulse Duration Normalized Capacitance vs. D Maximum Current (Amps) 1 1.E-6 Capacitance Normalized to D = 1. 1.E- 1.E-4 1.E-3 Pulse Duration (Seconds) D (olts) Clamping Waveform for During a A, 8/ µs Surge Clamping Waveform for During a A, 8/ µs Surge oltage (olts) OLTAGE CURRENT Current (Amps) oltage (olts) OLTAGE CURRENT 1 Current (Amps) Time (µs) Time (µs)

3 CDSOT236-DSL3xx - TS Diode Array Series Application Information Communication systems with exposed signal lines are often subjected to high level transient threats. The CDSOT236-DSL3xx family of devices was designed to help protect signal lines from threats such as those defi ned in Telcordia GR-89 and ITU-T. Figure 1 shows the CDSOT236-DSL3xx TS diode array used in a design topology that protects a DSL driver. The diode array limits the peak differential voltage across the DSL driver outputs. The current limiting resistors (R P ), typically about 1 ohm, limit the peak current seen by the driver. Low voltage varistors MO1 and MO2, with a typical working voltage of less than, limit the current in the line side of the transformer by limiting the voltage across it. Exact values for the current limiting resistors and the varistors are dependent on the characteristics of the transformer as well as the sensitivity of the driver to overvoltage/ overcurrent conditions. The use of primary protectors downstream from the device will also infl uence the requirements for this protection circuit design. In applications sensitive to very low levels of leakage current, optional bias resistors R B1 and R B2 can be used. Both resistors would be required for dual supply applications. Only R B1 is required for single supply applications. In this case, the anodes of the diode array should be connected to ground. R P CC MO1 DSL Driver * R B1 * R B2 Feedback R T To RJ11 Connector CDSOT236-DSL3xx EE MO2 R P *Optional Figure 1. DSL Driver Protection Design Topology When routing differential signal traces on the PCB, such as in a DSL application, it is important to maintain symmetry in the routing. Figure 2 below shows an example of how differential traces that connect to the CDSOT236-DSL3xx TS diode array can be routed. As the signal traces approach the diode array the traces should be fl ared out to make the connections with the device and then brought back together on the opposite side of the device. Routing to the next destination would continue from there. From IC To Next Connection Figure 2. Connecting a Differential Signal to the Model CDSOT236-DSL3xx

4 CDSOT236-DSL3xx - TS Diode Array Series Application Information (Continued) In applications where the current limiting resistors (R P in Figure 1) cannot reduce the current into (or out of) the driver to an acceptable level, the resistors can be replaced with a Bourns Transient Current Suppressor (TCS ) device as shown in Figure 3. The Model TCS-DL4-7-WH shown in Figure 3 is a dual channel device that has a nominal series resistance of only 1 ohm. The resistance between the two channels is very well matched with a nominal maximum difference of +.2 ohms between the channels. This device has a nominal trigger current of 1.1 amps. The current through the device would be limited to this level with up to 4 across this device, making it dramatically more effective than a 1 ohm series resistor. Devices with different trigger levels and series resistances are also available. For additional information on the TCS family of devices, please consult the data sheets on our website at ProductLine.aspx?name=transient_current_suppressors. CC MO1 DSL Driver * R B1 Feedback CDSOT236- DSL3xx * R B2 EE TCS-DL4-7-WH R T To RJ11 Connector MO2 *Optional Figure 3. DSL Driver Protection Design with Transient Current Suppressor Technology Figure 4 shows how the trace routing should be done when the TCS device is used in conjunction with the CDSOT236-DSL3xx TS diode array. From IC TCS Device TS Diode Array To Next Connection Figure 4. Connecting a Differential Signal to the Model CDSOT236-DSL3xx and TCS Device

5 3312 CDSOT236-DSL3xx - 2 mm SMD Trimming - TS Diode Potentiometer Array Series Product Dimensions This is a molded SOT23-6L package with RoHS compliant % Matte Sn on the lead frame. It weighs approximately 1 mg and has a fl ammability rating of UL 94-. Recommended Footprint 2.4 (.94).3 -. (.14 -.) ( ) (.1 -.1) (.3 -.1).8-1. ( ) ( ) ( ). (.7) (.9 -.7).3 -. ( ).9 -. (.4 -.8) DIMENSIONS = MILLIMETERS (INCHES).7 (.28) 1. (.39) Typical Part Marking DIMENSIONS = MILLIMETERS (INCHES).9 (.37) 1.9 (.74) CDSOT236-DSL312...L2 CDSOT236-DSL324...L4 How to Order CD SOT236 - DSL3 12 Common Diode Chip Diode Package SOT236 = SOT23-6 Package Model DSL3 = For use in ADSL/DSL applications Working Peak Reverse oltage 12 = 12 WM (olts) 24 = 24 WM (olts)

6 CDSOT236-DSL3xx - TS Diode Array Series Packaging Information The product is packaged in tape and reel format per EIA-481 standard. d P P 1 PART ORIENTATION Index Hole E T 1 B PIN 1 F W D 2 D 1 D P A C Trailer Device Leader End pitches (min.) pitches (min.) Start DIMENSIONS: MM (INCHES) W 1 Direction of Feed Item Symbol SOT23-6 Carrier Width Carrier Length Carrier Depth Sprocket Hole Reel Outside Diameter A B C d D 3.9 ±. (.14 ±.4) 3.9 ±. (.14 ±.4).9 ±. (.3 ±.4) 1. ±. (.61 ±.2) 178 (7.8) Reel Inner Diameter D 1. (1.969) MIN. Feed Hole Diameter D ±. (.12 ±.8) Sprocket Hole Position Punch Hole Position Punch Hole Pitch E F P 1.7 ±. (.69 ±.4) 3. ±. (.138 ±.2) 4. ±. (.17 ±.4) Sprocket Hole Pitch P 4. ±. (.17 ±.4) Embossment Center P 1 2. ±. (.79 ±.2) Overall Tape Thickness Tape Width T W. ±. (.8 ±.4) 8. ±. (.31 ±.8) Reel Width W (.67) MAX. Asia-Pacific: Tel: Fax: Europe: Tel: Fax: The Americas: Tel: Fax: Quantity per Reel -- 3 /13