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NUP4201DR2 Datasheet(PDF) 4 Page - ON Semiconductor |
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NUP4201DR2 Datasheet(HTML) 4 Page - ON Semiconductor |
4 / 8 page NUP4201DR2 http://onsemi.com 4 APPLICATIONS INFORMATION The new NUP4201DR2 is a low capacitance TVS diode array designed to protect sensitive electronics such as communications systems, computers, and computer peripherals against damage due to ESD events or transient overvoltage voltage conditions. Because of its low capacitance, it can be used in high speed I/O data lines. The integrated design of the NUP4201DR2 offers surge rated, low capacitance steering diodes and a TVS diode integrated in a single package (SO−8). If a transient condition occurs, the steering diodes will drive the transient to the positive rail of the power supply or to ground. The TVS device protects the power line against overvoltage conditions to avoid damage to the power supply and any downstream components. NUP4201DR2 Configuration Options The NUP4201DR2 is able to protect up to four data lines against transient overvoltage conditions by driving them to a fixed reference point for clamping purposes. The steering diodes will be forward biased whenever the voltage on the protected line exceeds the reference voltage (Vcc+Vf). The diodes will force the transient current to bypass the sensitive circuit. Data lines are connected at pins 1, 4, 6 and 7. The negative reference is connected at pins 5 and 8. These pins must be connected directly to ground by using a ground plane to minimize the PCB’s ground inductance. It is very important to reduce the PCB trace lengths as much as possible to minimize parasitic inductances. Option 1 Protection of four data lines and the power supply using Vcc as reference. 8 7 6 5 1 2 3 4 I/O 1 I/O 2 I/O 3 I/O 4 VCC Figure 5. For this configuration, connect pins 2 and 3 directly to the positive supply rail (Vcc), the data lines are referenced to the supply voltage. The internal TVS diode prevents overvoltage on the supply rail. Biasing of the steering diodes reduces their capacitance. Option 2 Protection of four data lines with bias and power supply isolation resistor. 8 7 6 5 1 2 3 4 I/O 1 I/O 2 I/O 3 I/O 4 VCC 10 K Figure 6. The NUP4201DR2 can be isolated from the power supply by connecting a series resistor between pins 2 and 3 and Vcc. A 10 k W resistor is recommended for this application. This will maintain a bias on the internal TVS and steering diodes, reducing their capacitance. Option 3 Protection of four data lines using the internal TVS diode as reference. 8 7 6 5 1 2 3 4 I/O 1 I/O 2 I/O 3 I/O 4 NC NC Figure 7. In applications lacking a positive supply reference or those cases in which a fully isolated power supply is required, the internal TVS can be used as the reference. For these applications, pins 2 and 3 are not connected. In this configuration, the steering diodes will conduct whenever the voltage on the protected line exceeds the working voltage of the TVS plus one diode drop (Vc=Vf + VTVS). ESD Protection of Power Supply Lines When using diodes for data line protection, referencing to a supply rail provides advantages. Biasing the diodes reduces their capacitance and minimizes signal distortion. Implementing this topology with discrete devices does have disadvantages. This configuration is shown below: |
Similar Part No. - NUP4201DR2_08 |
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Similar Description - NUP4201DR2_08 |
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