TVS Diode Selection Guidelines for the CAN Bus APPLICATION NOTE
■The Controller Area Network (CAN) is a serial communication protocol designed for providing reliable high speed data transmission in harsh environments. This document provides guidelines to select Transient Voltage Suppression (TVS) diodes to protect CAN data bus lines. TVS diodes provide a low cost solution to conducted and radiated Electromagnetic Interference (EMI) and Electrostatic Discharge (ESD) noise problems. The noise immunity level and reliability of CAN transceivers can be easily increased by adding external TVS diodes to prevent transient voltage failures.
●NUP2105L CAN Bus TVS Diode Array
■The NUP2105L provides a transient voltage suppression solution for CAN data communication lines. TheNUP2105L is a dual bidirectional TVS device in a compactSOT−23 package. This device is based on Zener technology that optimizes the active area of a PN junction to provide robust protection against transient EMI surge voltage and ESD. Figure 1 provides a circuit diagram of the NUP2105L.
■The NUP2105L has been tested to EMI and ESD levels that exceed the specifications of popular high speed CAN networks. Listed below is a summary of the NUP2105L’s EMI and ESD specifications.
◆350 W Peak Power Dissipation per line, (8 x 20 μs)
◆Human Body Model ESD protection ≥ 16 kV
◆IEC−61000−4−2 ESD level ≥ 30 kV for contact discharge
◆ISO 7637−1, nonrepetitive EMI surge pulse 2, 9.5 A (1 x 50 μs)
◆ISO 7637−3, repetitive Electrical Fast Transient (EFT)EMI surge pulses, 50 A (5 x 50 ns)
◆IEC 61000−4−5 lightning and load switch immunity,10 A (8 x 20 μs)
■The NUP2105L uses silicon semiconductor technology to offer distinct advantages over alternative TVS protection devices such as MOVs and choke filters. A TVS diode provides a fast response time, low line capacitance and low clamping voltage. The NUP2105L has a time response time of less than 1.0 ns and is able to clamp fast surge transient voltages before damage can occur. The silicon design has a line capacitance less than 30 pF, which is required for the high 1.0 MHz data transmission rate. The voltage clamping limit of the device, defined by the 8 x 20 μs exponential waveform, is approximately equal to 42 V for a surge current of 10 A. The low clamping voltage ensures that the transient sure voltage will not exceed the CAN transceiver’s maximum voltage specification for the CAN_H and CAN_L data lines.
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Application note & Design Guide |
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Please see the document for details |
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SOT−23 |
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English Chinese Chinese and English Japanese |
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August, 2004 |
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Rev. 0 |
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AND8181/D |
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134 KB |
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