Questions tagged [reliability]

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I2C Hot Swap design and feasibility

I would like to hear if someone has successfully implemented a working connectable/disconnectable I2C interface. I'm working with the back plane (host device) and am looking into implementing a I2C ...
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1 vote
1 answer
44 views

If a motor driver IC has shoot-through protection does the controller need to add deadtime?

I'm designing a motor driver and controller system for an E-Bike, and I'm currently using the IRSM836-084MA. The datasheet mentions that it has "cross-conduction prevention logic", but to my ...
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3 answers
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PFHD of Dual Redundant Self Checking Circuit

I'm calculating some ridiculous PFHD values for a Dual Redundant Self Checking Circuit and since I'm no expert in reliability calculations (cough) I wanted to check some of the logic. I have two ...
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How can we model the piezoelectric behavior of a capacitor to mechanical and thermal transients?

I would like to model the behavior of ceramic capacitor to thermal and mechanical stress. We are seeing power supply fluctuations during reliability test and suspecting the ceramic capacitors' role in ...
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11 votes
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Soviet-era mounting techniques to absorb vibration (THT components)

This question is about a historical point of view. I was watching this video about a Soviet-era dialer. As many Russian devices of that time, the construction is simple and in some aspects strange (...
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Why do speed sensors fail so often?

The typical vehicle speed sensor (variable reluctance sensor) is a very basic device which essentially amounts to a coil of wire wrapped around a permanent magnet. Simple, yes, but very reliable? ...
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When to use a high voltage resistor vs multiple standard resistors?

Looking for the smallest & most reliable method of dropping 360V down to ~1V for a PMIC feedback pin. Reliability is probably the most important variable here. Question: In general are we be ...
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Should I be worried about the possibility of a microcontroller failing?

I'm making a commercial product for the first time and I am worried about the stability of my circuit over time. The product is a door interlocking system. It locks and unlocks doors using solenoid ...
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2 votes
2 answers
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Reliable connection for thin wire

I am searching for a reliable wire-to-board connection. The wire is 0.1 mm enamelled wire. The wire is solderable, but the polymer is very temperature resistant and needs to be mechanically removed ...
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1 vote
2 answers
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Power source redundancy for low voltage application

I am trying to design a circuit that u would like to be as reliable as possible. One feature I would like to add to my circuit is an additional voltage regulator for redundancy purpose. The problem is ...
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3 answers
171 views

The Mean Time Between Failure (MTBF) Quantity

It is the amount of time a system is operational i.e. MTTF plus the amount of time to repair it MTTR. I am considering repairable systems only. I know that it helps in scheduling maintenance, safety ...
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longer reliability in power systems

The highlighted term "longer", I think it should have been lower. What is longer reliability?
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STM32L4S9 low temperature FLASH memory programming

As there is no information on the internet I hope that I will not have any problems (as there are no complaints :) ). My device will receive OTA updates and my question is: Did you have any problems ...
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THT components reliability and advantages for small scale production [closed]

Examining this question in the "manufacturing of not consumer electronics". I'm looking for an opinion by others about some statements that I take for correct. Are THT components in general ...
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Graphic cards/components reliability after crypto minning

In the near future we will be probably flooded with graphic cards they were used for crypto mining. There are many not very well-founded discussions about their reliability. And similarly many un-...
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1 answer
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Can an n-channel mosfet gate be held closed for months at a time and still reliably open when Vin falls below threshold?

I made a prototype circuit to detect the loss of individual 12V lithium batteries in a larger parallel bank due to BMS cutoff (12V continuous signal from an individual battery suddenly becomes open ...
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Which is more robust against temperature cycles, solder or wire wrap?

When connecting a bunch of components in something that will be subject to repeated heating and cooling, are soldered joints likely to be more or less robust than wire wrap? Intuitively, it feels like ...
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3 votes
1 answer
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Calculation for IC lifetime for supply voltage overvoltage

What calculation can be used to calculate the lifetime of an embedded processor (<28nm process) when subject to a slight overvoltage? The supply rail in question is for analog portions of the ...
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2 answers
140 views

Mosfet thermal problems in linear applications

Modern power FET's can be unreliable in some linear applications due to thermal instability causing die hotspots and premature failure. This is called the Spirito effect. How do Silicon Carbide ...
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22 votes
5 answers
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How can we test the lifespan of electrical components?

We work with some electronic devices in our projects. We are at the stage where we need to create some test strategy to validate the lifespan (e.g. 1 to 5 years) of our devices for which we provide ...
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4 votes
4 answers
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Relay - Doesn't work....at first

I have a latching small signal <2A relay (V23079E1201B301) that switches between two audio signals. The relay has worked in about 10k boards over 7-8 years without much issue. We recently got a run ...
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Durability of SMD MEMS pressure sensors in pure oxygen enviroment

I have a question regarding durability/reliability of COTS SMD mems pressure sensors in oxygen rich (basically 100%) atmosphere under pressure of 1bar/1atm and temperature around 20C/293K. Sensor ...
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Latching Priority Encoder, circuit works but I don't trust it

I added a schematic even though the question is actually too simple for it. The datasheets for the devices are likely to be more revealing. The circuit is super simple. I have a 74HC148 priority ...
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How to detect brushless DC motor wear?

The manufacturer of the brushless motor does not specify a lifetime for the particular motor I am using (BLDC5-R-57BL120L2.) For my application it is essential that the axial and radial movement of ...
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1 vote
1 answer
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Base-emitter reverse breakdown and current

I have a circuit as follows, simulate this circuit – Schematic created using CircuitLab which provides a control current to an OTA as \$i_\mathrm{abc} = (3.27\mathrm{V} - V_\mathrm{in})/R1\$. ...
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How does manufacturer determine initial tolerance for capacitors?

Short version: I understand resistor initial tolerance is commonly obtained through sorting process where manufacturer only picks resistor that has resistance within the advertised initial tolerance. ...
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1 answer
253 views

Turn off MOSFET with diode - PWM controller Maximal output current

Here is my circuit (and I know that this circuit does not cause any problems at least for the moment): For turning on, the maximal current from the pin "OUT" is limited by the resistance ...
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0 votes
1 answer
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Is is possible to calculate the MTBF or Failure rate from a given datasheet when manufacturer have not given these details?

As there are new components getting added to the mouser or digikey, is it possible to calculate the failure rate based on some pre known facts and values? some vendors don't reply for weeks and I can'...
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10 votes
1 answer
821 views

What to check for when buying an electronic component or module

This has been raised as a canonical Q and A for future reference How can I acquire electronic parts/items/modules and ensure that there is minimal risk of them being unsuitable for my project or ...
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1 vote
1 answer
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Why do bare die chips (MOSFET) have a maximum storage temperature?

As far as I understand, a chip in general and a MOSFET in particular has a maximum operating temperature (let‘s say 125 °C or 150 °C for Si) because above that temperature the risk increases of ...
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2 answers
102 views

Electronic device operating temperature declaration

How is device operating temperature range determined? I supposed that for a specified temperature range all the built in components have to support it. I am in doubt because I saw some commercial ...
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1 vote
2 answers
224 views

Why are 3.5mm audio jacks unreliable?

Several of my devices with 3.5mm jacks make unreliable connections. The sound will cut out when the plug is wiggled slightly, or one ear will not have sound at all, or the sound will "cancel" in a way ...
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4 answers
491 views

Is exceeding Opamp Common Mode Voltage safe?

I understand that when you exceed an Opamps Common mode voltage limit that the output will no longer be reliable. And that this limit is often a bit less that the supply rails. But would slightly ...
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Li-Ion Battery Swelling Mechanism

I have recently had both a tablet (manufactured 2013) and a phone (manufactured 2017) battery swell (both batteries are Li-ion). The photo below shows the tablet's damage. Both batteries still ...
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Calculating FIT for Magnetic Sensors

We have qualified one of our magnetic sensors (80 samples, 1000 hours - JEDEC) with zero failures and we are asked to provide a FIT. The product is not repairable so I would think an MTTF would be ...
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MTBF / MTTF and parallel systems

I'm doing an MTBF calculation for a system. Basically I calculated or searched for the MTBFs / FITs of every component. Then added up the FITs and got the total MTBF. My first question would be the ...
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2 votes
0 answers
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Calculating reliability of a parallel redundant system

I'm trying to calculate the reliability of a system that has proven to be a bit more complicated than I thought. Here is the block diagram for the system: Every single component in this diagram is a ...
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2 votes
2 answers
328 views

Can an electronic system be built with absolutely no single point of failure?

Is it possible to make an electronic system, where every sub-system is duplicated and absolutely nothing is a single point of failure and if a failure (or multiple failures) occurs the system itself ...
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29 votes
7 answers
2k views

How to design electronics to last 40 years or more?

I've been reading about the Voyager space probes and am very curious about how you design electronics and instrumentation for a very long life (40+ years) without any physical maintenance. My guesses ...
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2 votes
0 answers
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Can reverse breakdown voltage be used to simulate lifetime aging of phototransistors?

As phototransistors age, their responsivity to light decreases (a fixed amount of light generate less photocurrent). To simulate long-term aging of phototransistors in a short period of time, one can ...
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Junction Temperature Estimation Error

When predicting the junction temperature (Tj) of semiconductor chips (for example IGBTs) by available thermal models such as FEM simulations, how much is the maximum permissible Tj estimation error ...
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When to use a terminal pin?

Would you ever be advised to solder hookup wire to a terminal pin (and maybe sleeve it with heat shrink) instead of soldering it directly to the PCB?
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2 answers
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12V Car headlight halogens vs. 240V mains golf balls (longevity)

The halogen headlights on my car must be about ten years old; I've never changed them and they put up with vibration, extremes of temperature etc. Yet the 40W mains ones in my house (normally dimmed) ...
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0 votes
1 answer
193 views

MOSFET and TVS Voltage requirements for 120V single phase AC circuit

I am designing a circuit that will gate single phase 120V AC through back-to-back N-channel MOSFETs connected as shown below. When passing AC, one MOSFET is on and the body diode in the other is ...
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Deciding between ULN2804 or ULN2803 with 74HC595

I'm making a circuit with Arduino + 74HC595 + (ULN2804 / ULN2803) to drive a few 12 V Motors. I'm trying to decide whether to use the ULN2804 or ULN2804. On testing, performance of both is fine, ...
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0 answers
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Majority Voter for complex data

How is a majority voter for complex data implemented? If there is only one integer value which should be compared you can use a discrete circuit but how does it work for multiple datasets and floating ...
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1 vote
0 answers
338 views

Estimating gate or transistor count for an IC

I'm messing around with calculating predicted failure rates using MIL-HDBK-217F. For microcircuits (depending on linear or digital) you need to come up with a gate count or a transistor count for the ...
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1 vote
0 answers
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Standard LiPo battery packs & product liability

I'm designing a high-power portable product that I would like to eventually bring to market. I need to use LiPo battery packs in order to achieve sufficient energy density, but I do not think I will ...
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1 vote
1 answer
134 views

Stagger Traces in a Flex Circuit?

I am designing a connector to PCB interface using a flex-circuit. Stackup is R-F775 2-layers with plated thru-holes and stiffeners (though the area in question has only traces). I'm wondering if it ...
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2 answers
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STM32F405 Setting Clock Freq Less than Max 168 MHz

For STM32F405 the max system clock frequency is 168 MHz. I want to run it at marginally lower frequency only for the sake of safety and reliability because my application will run non-stop through out ...
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