The top 10 applications of ESD devices in the protection of the circuit

Because of frequent hot-plugs,the chips in the USB, SD card, MMC card, DVI / HDMI, CAN and other interfaces, is very susceptible to static electricity. On these occasions,it can not use the ordinary regulator tube for protection, because the rate is too slow, and the capacitive load is large,which will affect the data communication channel. NXP special offer the following program for your reference.

1. USB2.0 protection (PRTR5V0U4D for dual USB)

 The following figure shows the PRTR5V0U4D connection in a dual USB application.

Application of PRTR5V0U4D in Dual USB

2. SD card protection

The following figure shows the connection of the PESD5V0L6UAS / PESD5V0L6US in the SD card protection circuit.

The following figure shows the connection of the PESD3V3L4Ux / PESD5V0V4Ux in the SD card protection circuit.

3. MMC multimedia card protection

The following figure shows the connection diagram of the PESD3V3L4Ux / PESD5V0L4Ux / PESD3V3V4Ux / PESD5V0V4Ux in the MMC MultiMediaCard protection circuit.

4. DVI / HDMI protection

DVI and HDMI interfaces are commonly used for connecting digital video and display panels. As high-frequency signals (up to 1.6GHz) processing requirements , these data lines were configured very low-line capacitance. Philips offers a unique 1pF line capacitance protection device. The performance continues to maintain the IEC61000-4-2 standard at 8 kV. The following figure shows the connection of the NXP ESD device in the DVI / HDMI interface protection circuit.

5.Independent Audio / Video protection

 The following figure shows the connection of the PRTR5V0U4D / PESD5V0L4Ux in a separate Audio / Video interface protection circuit.

6, S-Video / Audio protection

 The following figure shows the connection of the PRTR5V0U4D / PESD5V0L5Ux in the S-Audio / Video interface protection circuit.

7, SCART connector protection

SCART interface in TV to VCR, set-top boxes, DVD recorders and satellite receivers in the connection has been widely used. ESD protection is important because sensitive ICs are used in these applications. Especially video and audio signal lines. NXP recommends the following devices for customer reference PESD5V0L5Ux / PESD5V0L7Bx.

8, IP chip in SIM card protection applications

 The following figure shows the connections of the IP series ESD protection devices in the SIM card protection circuit.

9, IP chip in SD / MMC multi-media card protection applications

 The following figure shows the application of the IP series ESD protection device in the SD / MMC multimedia card protection circuit.

10, car CAN and LIN bus protection

CAN bus, LIN bus is mainly used in automotive electronics in the early peiod.these have been widely used in a variety of short-range bus sites, such as industrial, automotive electronics and other harsh environments. NXP recommends that Adding an ESD protection device in such interfaces to enhance the reliability of your system. The recommended connection diagram is shown below.

  Author ：Darcy Beaufort — WIN SOURCE ELECTRONICS