Questions tagged [esd]

ElectroStatic Discharge, it's caused by accumulation of electrostatic charge as a result of rubbing, and can damage semiconductor devices like integrated circuits.

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111 views

Zener diode response time

I have the below circuit: Forward diode D0002 - Datasheet SIJ series for reverse protection and C0001-C0004 capacitors for ESD protection. Zener diode - Datasheet - 36V reverse breakdown. Question : ...
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152 views

Do the MCP23S17 GPIO pins need protection against latch up ESD within this circuit?

I wrote about this system before. I will focus my questions now on "ESD protection" direction. I have an SPI based system in which a Raspberry talks with a GPIO expender device using SPI ...
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54 views

Bonding yourself via oscilloscope GND?

I want to prevent ESD and I read that connecting the wrist band to i.e. USB ground is not a good idea. My oscilloscope has a test output where I would like to connect the aligator clamp of the ESD ...
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18 views

What is the best TVS/ESD protection for Wheatstone bridge circuit?

I have 150K ohm on three legs of Wheatstone bridge, one leg on human body (skin), bridge excitation voltage is 5V, differential amplifier is be used to read the differential voltage of the Wheatstone ...
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39 views

ESD Protection Diode: I/O Protection on VBUS Line instead?

I'm looking at a few 4 channel ESD diodes for my USB circuit, specifically the ESD0524P and the PESD2ETH-X. For my circuit, I only need 2 channels, D+, D-, and a channel for VBUS. Looking at these two ...
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1answer
41 views

How to choose TVS/ ESD for sensitive application?

I am using ad8232 ECG with 3 electrode configuration, Edited ad8232 used schematic I need to protect circuit from any voltage more than 5V, since ecg measure only around 300mV with common mode signals....
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52 views

ESD control to protect personnel inside container van

we are doing a simulator project inside a 30-foot container van. All equipment will be grounded to a central earthing point. Each grounding connection should be less than 2ohms. Van will be used on ...
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2answers
50 views

Can static be discharged when removing sensitive electronics from a static shielding bag while you and the bag are at the same voltage?

Suppose you have a static/ESD shielding grey bag housing electronics sensitive to ESD. I believe that this type of bag has a static dissipative surface and a conductor on the inside serving as a ...
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2answers
231 views

ESD protection during lightning storms

I'm new to electronics, and I'm currently building my electronics area. Let's say that I have an ESD bench mount drilled into my wooden workbench, and this ESD bench mount is then connected to the &...
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1answer
31 views

ESD protection for signals routed through multiple boards

I have a few questions regarding ESD protection: If a particular signal is routed through multiple boards (through connectors), do we need to place ESD diodes at each port (connectors)? For example, ...
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186 views

Install grounding cable with eyelet to outlet, no center screw

I've found an ESD mat that comes with a grounding cable with an eyelet that's supposed to be screwed into the center (grounded) screw of an electrical outlet. But in my home, the outlets do not have ...
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1answer
51 views

ESD Protection for 1Gb Ethernet pre-magnetics able to withstand PoE?

I am looking for suggestions on protecting a gigabit ethernet port from ESD between the jack and the magnetics. Due to the nature of the equipment design, the magnetics cannot be placed next to the ...
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37 views

How dangerous is to have the USB (2.0) D+/D- lines are exposed in the open (ESD et al)?

Sometime ago I designed an bespoke enclosure for an el' cheapo action camera (GoPro clone), which pinned out the USB's power lines outside the waterproof enclosure - something like this, with the ...
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51 views

Heel strap vs wrist strap around ankle

I am a novice to electronics, and I am currently building a home workstation. In this question on ESD chairs, the user Sparky256 said the following in his answer: If you are wearing BOTH a wrist and ...
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2answers
259 views

ESD chair for home workstation [closed]

As mentioned here, I am a novice to electronics, and I am currently building a wooden workbench. The workbench will have an ESD bench mount and ESD matting over the entire bench. Furthermore, the ...
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79 views

ESD safety when working across multiple workbenches/tables

I am a novice to electronics, and I am currently building a wooden workbench. The workbench will have an ESD bench mount and ESD matting over the entire bench. I now want to have a small fold-out ...
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20 views

Protecting External Connector Ground Pin from ESD

I have some TRS (stereo phone) connectors on my protable USB device (no earth ground), and I'm wondering what to do about ESD events that enter the device via the sleeve (ground) of the connector. ...
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1answer
59 views

TVS diode for RS485

I'm studying the ISO1500 for an RS485 application. In particular, I'm looking for a TVS diode for bus protection. I've found that a common TVS diode used for RS-485 applications is the SM712 (like ...
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1answer
78 views

Connection between Chassis GND and Circuit GND for ESD/transients

In Henry Ott's Book, Electromagnetic Compatibility 2009, it has the following: Figure 14-14 seem to be in conflict with Figure 3-24 and 15-15. The circuit GND is connected through a TVS to chassis ...
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69 views

Why asymmetrical current limiting on ESD Diodes?

I was reading this: https://www.analog.com/en/analog-dialogue/articles/esd-diodes-as-voltage-clamps.html And came by this: Why would anyone choose the configuration in Figure 1, which limits ...
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33 views

ESD Protection on serial relay switches

I'm trying to switch high-quality audio signals using 2 serial relays like the picture below. I'm not sure if this is the best solution to switch between 2 inputs and 2 outputs, but here it is. In ...
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2answers
45 views

What is the maximum voltage that the circuit can withstand

Below is my circuit, ESD Capacitors Specifications : C0001, C0002, C0003, C0004 = 47nF, 100V, 10%, 0805 I have 2 basic questions : When a +4kV pulse & 330pF is applied, Does the 12.77V (Q=CV ; ...
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33 views

Electrostatic protection - input and output ESD protection added to op amp w/built-in ESD

I have an op amp circuit using the OPA2626 that has a built-in input/output ESD protection of +/-3000V human body model. The circuit is 3.3V single supply, non-inverting, with only an external ...
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1answer
72 views

Electrostatic discharge on ungrounded components

My understanding of ESD is that there has to exist a path to ground for static charges to discharge. Take a MOSFET as an example that is vulnerable to ESD and packaged in a way to protect against it, ...
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2answers
62 views

How can I discharge static electricity from my body?

I am planning to install a PCI Express Wifi-adapter in my PC. In order to do this, I would need to open my PC. I'm worried that if there is static electricity in my hands it could fry the motherboard. ...
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1answer
23 views

Would the static charge from a silicone work mat be dissipated by an ESD mat if placed on top of it?

I know the proper rubber mats that are both ESD safe and heat resistant are quite expensive, and definitely out of the price range of a beginner hobbyist like me. I have also read that the silicone ...
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44 views

What is considered ESD Sensitive and non-ESD Sensitive?

For example, if an integrated circuit has an HBM rating of 8 kV but is now embedded in a circuit board, which is now installed inside an equipment assembly, I would think the ESD susceptibility of the ...
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42 views

Is a metallic conductor within an electrostatic field necessarily subject to discharge?

Basically what I'm trying to determine is if the new RAM chips I received in the mail were potentially damaged from static electricity. Late last night, tired and foggy, I built up a considerable ...
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1answer
52 views

Providing high voltage tolerance and ESD protection to MCU

I am working on a design for an automotive application. Because its for testing and prototyping I expect the inputs to accidentally, or perhaps intentionally, be attached directly to the battery/...
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66 views

How to protect an input from ESD?

I would like to protect the input of a sensor (reference : MAX30001) from ESD. In the datasheet, they say that the absolute maximum rating of this input is -0.3 V < Vinput < 2 V. Do I have ...
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49 views

What's a good method for filtering out glitches from stepper motor step signal?

I have a product which contains 2 stepper motors. I've been hardening the system against EMI and ESD. It used to reset or crash when hit with static. I've been able to mostly eliminate this by ...
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65 views

Identify the Maximum ESD Clamp Voltage on a circuit

This is with regard to a series of my ESD and Inrush Related questions. My circuit : The Node A goes to two other circuits like below : AND Now, I apply an ESD pulse of say 8kV/330pF, the ...
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1answer
78 views

Calculate Capacitance Value and Voltage Rating in the event of ESD Pulses

I have a input power filter circuit. It has ESD Protection capacitors which help to protect the downstream circuit from ESD Pulses. ESD Capacitors Specifications : C0001, C0002, C0003, C0004 = ...
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1answer
47 views

Cable connector order causing USB to break

We have a system that's using nonstandard connectors (M12) to provide 24V power from one device to another, along with USB lines. Each system has ESD protection on its usb lines. The issue is that ...
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47 views

How is this PMOS FET working as ESD protection?

Can somebody please explain the circuit functionality? I'm thinking of PMOS (\$V_{sg}=0\$) as a current-limiting diode. Am I right?
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2answers
72 views

High Voltage and Low Charge - Analogy (ESD & Lightning)

How can something have high voltage but low charge? Can anyone provide an analogy for this? I was going through the ESD topics and read the ESD events usually have high voltage but have low charge? ...
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1answer
53 views

Where to connect TVS clamping Diodes

This question just came up during the review of a design. Should the TVS rather be placed before the feedthrough-cap or after? I would place the TVS before the cap (see A in schematic) because TVS ...
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2answers
73 views

When ESD protection is necessary and where should TVS be placed?

I'm designing a PCB in which the main ICs are a STM32F0 microcontroller and an INA226. These IC have some IO pins exposed in a header and the device will be handled by people. Is it likely that an ...
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2answers
95 views

How do ESD monitors work?

How do ESD monitors work? Especially those dealing with one wired ESD wrist band. All I've been able to grasp is that the human body acts as a capacitor between the wrist band and the ground. But I ...
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33 views

Long bus powered device protection

I'm looking to have several devices attached to a long (total ~10 m) powered i2c bus. The bus would be regulated to 5V at one end and the whole system will operate in exposed outdoor conditions on a ...
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50 views

Are usb ESD protection like the PRTR5V must have?

I am making a custom pcb basing on Arduino's open source schematics and i noticed that their newer products always have a PRTR5V0U2X USB ESD protection wired like this: Are they a must have if you ...
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1answer
76 views

LCD 4x20 display malfunction after ESD, Recover?

I have a device with 4x20 generic LCD display controlled by arm STR750 processor which is working well. According to IEC EN 61000-6-4 standart criteia B display of device should be recovered in a ...
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43 views

CAN Physical layer - Choke evaluation

I have my CAN configuration as shown in the below drawing(automotive application), the uC that I’m using has both the CAN controller and the physical layer transceiver built-in so I don’t need a ...
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2answers
3k views

How does ESD protection work with TVS diodes?

I have two questions regarding TVS diodes. This paper describes very well what happens when you want to protect a circuit with a unidirectional and bidirectional TVS diode and a positive and negative ...
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1answer
49 views

ESD strap/mat when working on battery powered devices/PCBs

When the devices you're working on are plugged in an outlet or when you're working on loose components, it makes perfectly sense to ground yourself to the outlet or any other solid ground through a ...
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70 views

Microcontroller Oscillator Layout for ESD immunity

I have a small portable USB device failing ESD immunity. It's a two layer board with a solid ground plane on the bottom. I have diode protected inputs, and there's a TVS on the USB connector, and I'm ...
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3answers
106 views

How to damage the components with ESD?

I have a task to present the ESD safety practices in lab and at work in general. I want to make this interesting and for the freshers out of college, I want to let the importance of ESD precautions ...
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1answer
30 views

Voltages and charges with regard to ESD

My question is with reference to this question - ESD protection using a capacitor I am unable to grasp the relation between charge, voltage, and capacitance, although I can understand all these terms ...
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73 views

Is it Possible to Static Test With a Barbecue Lighter?

I'm working on an issue with a product where it freezes due to static shocks. I'm trying to recreate the issue and harden the product, but I don't have a real static testing wand like the test labs ...
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2answers
83 views

Are small signal relays vulnerable to ESD?

I am looking for a small relay to help me with network cables. The system needs to be able to withstand a reasonable electrostatic discharge on the cables. I am using MAX485 network chip, which has ...

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