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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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47 views

Connecting to an electrically isolated system with a manufacturing test jig

I am in the middle of developing a manufacturing test jig for a product that is powered using PoE (power over ethernet). Part of the specification for PoE is that devices that use it be electrically ...
2
votes
4answers
67 views

Enhancing TVS diode circuit

I was reading into Electromagnetic Compatibility Engineering by Henry W. Ott about ESD protections and I was interested by the following part. First, a series resistor (or ferrite) added in front ...
2
votes
4answers
73 views

Flooring for home lab

I am setting up a home electronics lab for projects with my kids, currently ages 4 through 10. What type of flooring would work best? We will be doing art projects in the same room, so we need ...
4
votes
3answers
334 views

ESD ratings of diodes and bipolar transistors

While it's easy to find ESD ratings for ICs (bipolar, CMOS, and any mix) and to some extent for MOS transistors (for the inherent reasons), I don't find ESD rating for many common diodes (left apart ...
17
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4answers
2k views

USB Shield. To ground or not to ground?

I have been given a device at work to do some testing on. Basically an IC is becoming obsolete so I need to test a replacement part. Upon redoing the ESD checks, the device failed. I checked the ...
4
votes
1answer
407 views

Grounding the table

I'm preparing my private laboratory stand. I want to use an ESD mat, but my power outlet is far from the table so I can't ground it directly. I want to ground the mat on a table and I wish to use an ...
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vote
1answer
57 views

evaluating ESD protection for 3.3V i2c

Even though there are questions about ESD protection for i2c bus already in this forum, I wanted to ask how to suppress the clamping voltage of a TVS diode to a safe level. As an example, the ...
2
votes
1answer
52 views

reducing the voltage clamped by a TVS diode for SPI bus

I'm making a board with an AVR. Between the MCU and the connector I would have multiple lines for SPI communication. Since the environment of this board is expected to be very dry, it is needed to ...
5
votes
3answers
630 views

ESD protection on analog signals

I have a board which has its microcontroller pins directly breaking out to a breakout header. I am fairly certain the board won't be in ESD safe environment when being tested. I decided to get ...
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0answers
47 views

TVS protection burnt too easily

It's about an year that I'm using TVS diodes to suppress spikes from the AC motors (240V - max 240W) that drives my roller shutters and protect the solid state relay that actuate the motor. What is ...
4
votes
1answer
56 views

ESD from plastic enclosure to PCB in floating systems

I'm designing a battery powered device. The device will be placed in an environment where the relative humidity is below 20%. So it is essential to protect the electronics from potential ESD events. ...
1
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2answers
69 views

ESD protection for power lines using capacitors

I heard that a capacitor can protect a DC power line from a transient voltages by ESD event. Unfortunately I don't understand how it works in detail. It would be appreciated if someone could answer ...
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2answers
93 views

ESD/EMI Design for CE, Recommendation seems wrong from test lab

I have designed a product for a customer, that now needs to pass UL/FCC/CE Testing, It passed UL & FCC but failed CE for both 8kv ESD and EMI. The Chinese test lab my client went through sent me ...
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2answers
28 views

how can I get leakage current in tlp?

I got tlp test data and found that the current at vertical line means leakage current. But I don't understand the method how does the tlp-test measure the leakage current. I tried to search the ...
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2answers
87 views

when do you expect negative ESD?

If you have an I/O pin to protect, don't you always need the protection from both positive and negative ESD? I see that many circuits have clamping diodes connected between I/O nodes and power nodes. ...
1
vote
1answer
69 views

ESD potection in the PCB

I am using micro USB socket to charge the battery in one of the device and now we are planning to go for CE certification for which we are doing EMI/EMC test. For the ESD IEC 61000-4-2 (+/- 6 kV ...
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votes
1answer
68 views

TVS diode array for 3.3V I2C lines

I want to protect sensors that use 3.3V I2C from strong ESD. After searching internet for a while I found that LCO3-3.3 provides protection from 30kV. However, I'm still not sure if the one can be ...
1
vote
1answer
58 views

The possibility of ESD in an isolated, mobile system

When you have an isolated, battery powered device, then shouldn't you expect ESD? Let's say I have two boards connected with each other through cables and connectors. The components on the PCBs are ...
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0answers
21 views

Varistor clamping voltage calculation

I would like to know if it is possible to calculate the clamping voltage provided by a varistor to an IC pin for an automotive ESD waveform ISO-10605 8kV. I would like to know if it will protect my ...
2
votes
1answer
51 views

Ethernet PHY TX & RX pin failures

I am seeing a problem with Micrel Ethernet PHY KSZ8721BLI. Because of some mechanical constraints, the PHY is located near the edge of the main board and a small card edge connector. The board slides ...
0
votes
1answer
68 views

What are these fuse-looking cartridge case components on small, battery operated RF tranceivers?

I have recently opened up 3 dead, battery-operated RF transceivers lying around, both wearable and key-chains. I've noticed that all three had components that looked like fuses (cartridge case), ...
0
votes
1answer
104 views

Question about ESD wristband and lightning

as far as I know all ESD wristband's ground connection has an 1M ohm resistor built in for safety. So what would happen if I am working on lab wearing ESD wristband which is connected to the home ...
0
votes
1answer
38 views

microUSB casing to the ground, ESD protection

I am thinking to use TVS diode TPD1E10B09 for ESD surge protection. The general convention is outer edge of the microUSB is connected to the ground, so any ESD strike happens it will be grounded. But ...
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vote
1answer
96 views

What is a ESD tube?

In the ESP32 datasheet, what do they refer to with "ESD tube"?
3
votes
1answer
65 views

Shipping & Handling Electronics & Electro-mechanical parts

What are common packaging(Shipping & Handling) guidelines (specs/stds) for Electronics & Electro-mechanical parts? Currently, working on adding onto our current generic guidelines for ...
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3answers
198 views

Decoupling capacitors on I2C interface + ESD protection

I had one of my PCB designs reviewed by someone and the reviewer suggested that I add decoupling capacitors on the clock and data lines of I2C interface. I am a bit surprised as I have always seen ...
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2answers
132 views

Protecting microcontroller digital output pin from ESD, reverse connection, and other possible user error

I want to protect an output pin from ESD, reverse connection, and other possible user error that might cause damages to my circuit. This pin output pulses depend on the amount of water passing through ...
3
votes
5answers
226 views

How necessary is ESD protection, really?

I'm not asking about manufacturing. I'm asking about designing electronics to survive normal use in the field. I want to figure out just how necessary it is to include TVS diodes in my design. As I ...
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vote
1answer
46 views

MOV max clamp voltage

Here in an interesting discussion about MOV specifications If I want to protect a 3.3V circuit tolerant to 5V voltage against ESD, I can select a little fuse MOV for example V3.5MLA0603. I want to ...
1
vote
3answers
66 views

Is there any sense in carrying assembled enclosed electronics in a static-shielding bag?

Say I have a Raspberry Pi enclosed in a metal case, such as this: Would it offer any additional level protection if I put it in a static-shielding antistatic bag whenever I carry it around (e.g. ...
1
vote
3answers
181 views

Why is it important, in terms of ESD protection, to ground a PCB to its case (if not insulative)?

I have a 12V DC-powered SBC to mount inside a metal case. How important is it that I connect its ground(?) to the metal case on the interior? How is this going to protect against ESD events? From my ...
3
votes
2answers
64 views

How should I use a static-shielding bag prior to opening, and why?

After grounding the ESD mat and wearing the properly grounded anti-static wrist strap, what is the correct process to take the contents out of the static-shielding bag and take it onto the antistatic ...
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0answers
55 views

Can a grounded static-shielding antistatic bag be used as a circuitry work surface to protect from ESD?

Basically, I have looked around about how to take proper care with respect to ESD and I am quite confused. I know an antistatic bag of any type would not provide additional protection from ESD if used ...
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1answer
116 views

What is a safe way to carry around (wrt ESD safety) a single-board computer in an enclosure like this? [closed]

I have a single-board computer and an enclosure, which will hopefully look like this in the end: I have three small questions: If I only hold it from the edges while assembling the enclosure, do I ...
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0answers
45 views

power pin to ground impedance- Short(0.3 Ohm) [duplicate]

I am designing a board and the problem I am facing on the board hardware is that the core power supply and ground has very low impedance of around 0.3 Ohm. This is leading to a conclusion of two nets ...
3
votes
3answers
147 views

History of ESD protection

These days you can't read anything about electronics without hearing about the dire consequences of omitting ESD protection from your designs. It seems this wasn't always the case. If you look at ...
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2answers
74 views

ESD Protection Shoes [closed]

Can ESD protection shoes be worn at any conditions (in relations to electrical / electronic systems). I understand ESD protection shoes / overalls are used against generating static on the body. But ...
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2answers
101 views

Why do I see a 20 Volts peak-to-peak sinudoidal signal @ 50 Hz on my ESD mat cover?

I accidentally touched the ESD mat cover on the my table with oscilloscope probe[voltage probe, 700MHz]. It is shown a pure sinusoidal signal with an amplitude of near 20Volt peak-to-peak @50Hz on the ...
2
votes
1answer
94 views

Placement of ESD resistor

We have a circuit that has a 6V input for charging. We want to protect the device from ESD on the input, but have some discussion on where to place a resistor. The two differences we are looking at ...
0
votes
1answer
69 views

Component Symbol identification; 2-pin rectangle with an N

I couldn't find anything on the web for it. On first thought it might be an ESD protection diode because in the schematic, t appears near USB and stuff that might be sensitive. , here in context : ...
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0answers
43 views

What is the source of ESD by soldering?

I'd like to know that by soldering a circuit board, what causes the potential difference between the soldering iron and the board. Is it just static electricity (like by hands), or is the power source ...
-1
votes
1answer
369 views

How bad is this soldering station from ESD perspective?

I found this cheap soldering station called OLED T12, which might be good for my current purposes (I'd like to solder cheap SMDs). According to the images 4 wires run from the station to the iron and ...
6
votes
4answers
2k views

Is a single wrist strap enough against ESD?

I bought 2 anti-static gloves and 1 grounded wrist strap to protect the parts against ESD by assembling computers. I was wondering whether a single wrist strap is enough, because I use to touch parts ...
1
vote
2answers
126 views

How susceptible to ESD damage are JFET gates?

Are the gates of JFETs protected against ESD transients? Is it best to include back to back zeners like with MOSFETs?
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2answers
216 views

Do air ionizer harm electronics?

I just bought an air ionizer which claims to putting out "negative ion" to the air to make dust attracts to grounded surfaces, I plug it in for a while and found out when I touch a metal plate (the ...
1
vote
1answer
89 views

Dangers of ESD wrist wrap / mat / ground Plug Adapter in an Apartment building?

I would like to know if there are any dangers when we are using a wrist wrap connected to an ESD mat that is connected to ground on the wall socket in an apartment building. Lets imagine that in your ...
0
votes
1answer
80 views

Practical ESD protection without latchup

My understanding has always been that any CMOS I/O pin needs external ESD protection - since the on-chip protection diodes are only there to guard against ESD events during manufacture handling. ...
1
vote
1answer
74 views

ESD and Electrolytics

Consider the simple circuit schematic below: 1) Would a high voltage (say 1kV-25kV) human body ESD discharge event (1ns rise time, 100ns total) at OUT have a negative effect (damage or destroy) the ...
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2answers
111 views

probable cause of damage to small SMD part: ESD, heat, something else?

The part in question is a 2 x 2 mm LGA accelerometer. 1. First soldering scenario, 10% non working parts after the assembly: no ESD protection gear hot air gun smoothly brought near / away from ...
2
votes
1answer
47 views

What is maximum ESD current flowing through the pin for HBM model?

I have a given specification HBM ESD tolerance on my IC (For instance 1kV). I just want to estimate the maximum current which will flow on the pin in question and so determinate the clamp point on the ...