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Questions tagged [maximum-ratings]

Questions related to the maximum ratings of a component such as maximum voltage, heat and other specs which if exceeded will likely destroy the device

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Cannot find the maximum ratings for the output current

For the part of a circuit shown below I'm using an LT1007 but couldn't find any information about the maximum current output can sink or source. They have written every tiny detail but the maximum ...
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2answers
122 views

How to determine the current rating of Litz wire winding at high frequency?

How can we determine the current rating of a litz wire winding at high frequency? This is my try: For example, if we use 660/38 litz at 85kHz, we can see the equivalent AWG is 10 (reference). Then, ...
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49 views

Modifying a buck converter for lower current rating

I have been learning about buck converters and I think I understand the principle of their design. However, I am unsure of how a current rating would be calculated for a particular design. The ...
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1answer
34 views

Amperage discrepancy on computer PSU

I have a 500W PSU that has both 12v and -12v supply rails with the dual +12v rails rated for 360W (20A each) and a single -12v rail rated for 9.6W (0.8A). My question is; if I was to power something ...
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113 views

Are three-phase contactors rated per pole or in total?

Are three-phase contactors rated per pole or in total? For example, have a look at this datasheet for a random three-phase contactor: datasheet In the datasheet it says that for AC-3 loads (1) the ...
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2answers
21 views

Using an LIS3DH at LiPo Voltages

The LIS3DH 3-axis accelerometer specifies that it's supply voltage should be between 1.71 V and 3.6 V. For most applications, this just means you are using either 1.8 V or 3.3 V as your main rail. ...
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3answers
58 views

Is rated current supposed to vary based on voltage?

Recently I have been reading a lot of datasheets and noticed that many manufacturers specify a current rating for their products (especially connectors) without specifying at what voltage the current ...
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1answer
53 views

What is a safe max rated current percentage for a 1A, 5V positive voltage regulator like a 7805?

I have a simple circuit comprised of seven 5V relays and eight 5mm LEDs, if the supply is 5V, it will draw a max of 660mA DC. I was planning to use a 7805 positive voltage regulator rated for 1A, so ...
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1answer
60 views

What is the actual ratings of this limit switch?

I'm going to use this microswitches as the limit cut off for motorized locking system for sliding door of my store room under the stair case. Upon checking it properly, the Indonesian made Omron ...
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3answers
1k views

Does the wattage of a resistor factor into the resistance of a resistor?

Resistors come in a variety of different ratings based on wattage. As a rule, lower wattage resistors are smaller than higher wattage resistors. I understand the wattage determines roughly how much ...
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1answer
219 views

What is Maximum Average Forward Rectified Current? (1N4001 Diode)

I am wondering if someone can explain what Maximum Average Forward Rectified Current means for a diode. I see that this is marked as 1 Amp in the datasheet for the 1N4001. I have not been able to find ...
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1answer
61 views

Is it appropriate to use a 300V RMS CAT I rated oscilloscope to measure 230V RMS of a power inverter?

Yesterday I decided to look at the waveform of my portable power inverter. The inverter specs are the following: Input: 12 V DC Output: 230 V RMS Rated power: 300 W I powered my inverter from a ...
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83 views

Use of a connector beyond OEM's voltage rating

I've been looking for some time for a suitable connector for my device, and happened upon a seemingly perfect option. It has the right number of pins, the right mix between signal and power pins, the ...
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2answers
72 views

Can Micro-controller bear the voltage at its pins more than its rated voltage?

I have a micro-controller, for which i have a datasheet specifying the ac/dc characteristics of that mcu. But in this datasheet there are no absolute maximum ratings only the operating conditions are ...
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0answers
37 views

How to measure max current of a power supply 2

I have some power supplies of unknown rating. In a short answer from Rafal Powierski in How to measure max current of a power supply "How to measure max current of a power supply" (Since I cannot ...
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39 views

KUKA LBR iiwa Robot_Reducing the carried amperage by merging wires

Based on KUKA IIWA specification I can connect an 8A power supply to X651 (input) which is connected to two outputs (X36 and X32). Each output can provide (Max) 4A. My problem is that I need to power ...
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1answer
59 views

How to properly select a transformer in terms of thermal rise

I'm trying to reach a decision selecting a small transformer for a task, from an overseas company (which only significant because of the language barrier). I thought the selection would be easy ...
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1answer
45 views

How do i determine max voltage for a custom BLDC [closed]

I would like to know the process that you would go through to determine the voltage rating on a BLDC. I imagine that it has something to do with how the coils are wrapped and the how many coils there ...
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2answers
36 views

Power ratings for micro JST

I am just trying to figure out the max current which i could expose my new micro JST cables to. It says here that they are rated for 1A and 50V. Converted to power that would be 50W. that sounds very ...
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1answer
65 views

Understanding IC max current in Datasheets

I'm hoping someone can help a noob out here. I've been reading a lot of data sheets of late looking for chips that will work for a small project. In short I need to drive a number of outputs (mainly ...
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2answers
47 views

Can I use a DC power pack (12dcv 3a) with an inline connector rated at 24dcv 2a?

I have a power pack that is 12v 3a, I want to buy an inline switch so it can be turned off without having to unplug it. The following image is of the inline switch. It is rated for 24v at 2amp. If my ...
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1answer
50 views

How do manufacturers rate the voltage of light bulb or any types of load?

How manufacturer make light bulb or switch for a specific voltage? How it is determined that the light bulb will work at the maximum specific voltage?
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34 views

TCXO specification ambiguity

I am going through datasheet of TXKTPCSANF-32.000000. I require a clipped sine-wave TCXO with 1.8 Vpp maximum. However, the datasheet of the TCXO doesn't state the ...
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2answers
219 views

What is the maximum charging current of the MAX1737?

I am currently trying to choose a charger IC for Lithium-ion cells batteries and thereby came across the datasheet for the MAX1737: https://datasheets.maximintegrated.com/en/ds/MAX1737.pdf The ...
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3answers
1k views

Max Voltage for Speaker of Given Power Rating

I have been looking into the design of loudspeaker drivers and would like to know how to determine the maximum voltage which can be delivered to a given speaker. From Ohm's law we know that P = V^2 / ...
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1answer
24 views

What will be case if buck regulator (TPS62067) load current increases the rated current?

This is buck regulator I am using for 1.8 V output: TPS62067. Input Voltage = 3.3 V Maximum rated current = 2 A. How the regulator will behaving if the load current increases more than 2 A ? My ...
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1answer
177 views

Why do manufacturers strongly discourage using X7R capacitors in AC signal and mains filtering applications?

Recently I've seen notes in datasheets from capacitor manufacturers Kemet and AVX that recommend designers not use X7R capacitors for applications in which they will be placed across mains or used for ...
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5answers
11k views

Are LEDs better than we think?

Conventional wisdom about LEDs says their maximum reverse voltage \$V_{R(max)}\$ is quite limited, usually in the 5V-8V range. So, for experimentation purposes, I wanted to bring an LED into ...
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0answers
49 views

Calculating max peak current at different conditions

I have an IR LED (IR383), and I want to power it with 5v@38KHz. I'm actually calculating the resistor so I need the LED's maximum current. In the datasheet, it says that it accepts 100mA continuous ...
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1answer
71 views

Absolute maximum ratings interpretation

I have a datasheet of a CD74HCT86E XOR gate. Under Absolute Maximum Ratings, it says DC Output Source or Sink Current per Output Pin, IO For VO > -0.5V or VO < VCC + 0.5V . . . . . . . . . ....
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2answers
147 views

How do I know what power rating pots need?

EE novice here. In this post on reddit, the author wonders if 125mW-rated potentiometers are usable in the MFOS Noise Toaster. The Noise Toaster drives analog audio circuitry off a single 9V battery ...
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2answers
323 views

What determines the continous ratings of electric motors?

I've seen variations of this torque-speed curve for brushless DC motor performance, and I'm curious what criteria determine the rated torque and speed of permanent magnet DC motors in general. Does ...
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3answers
782 views

I/O voltage slightly greater than VCC

I'm trying to perform communication with a Motorola MPC5606B microcontroller using a cable that I already had previously. Using this cable will make things easier in my lab because everyone has one ...
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4answers
189 views

Effect of switching spikes (400ns duration) on capacitor rated voltage

I have a motor drive which uses 63V electrolytic capacitors, which are the part with lowest-rated voltage on the drive's DC link. I measured the switching spikes on the DC link voltage (carefully, ...
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1answer
210 views

Switch Current Rating - Current Maximum

I've searched through a lot of threads regarding this and found some answers, however, the data sheet I am provided has some information which is causing some confusion. I have a switch with the ...
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3answers
87 views

Characterization of RF Amplifier Chain

I am using a 3 Amplifiers chain for a Receiver system. The required Output is -32dBm while the sensitivity of the system is -55 dBm, I am able to achieve this. But the maximum I/P power for the ...
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1answer
93 views

Is there any way to calculate the voltage & current rating on an unmarked component?

I just acquired an assortment of electronic components, many of which either have no way of identifying ratings at all (ie resistors) and some ie (transistors) where there has either been no printed ...
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1answer
267 views

Inductor Inrush Current Rating

I am experimenting with the simple circuit shown below and was wondering how to ensure that the inductor used would handle the inrush current. My reasoned solution is the following: I solved for ...
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1answer
179 views

Is maximum BJT VEBO rating exceeded in this miller effect compensation circuit?

I have an switching circuit containing a transistor to switch the inductive load. There is a miller effect compensation capacitor (C1) in parallel with a base resistor. (The values of the two ...
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2answers
213 views

How to guess voltage ratings and current ratings in capacitor and inductor?

I have a list of values of capacitors and i also know their material types! But i don't know how to figure out their voltage rating? "Ratings have been removed in the capacitors for this purpose" ...
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0answers
46 views

employing a series resistor to mitigate an absolute maximum voltage rating

I am trying to run an IC with an absolute maximum voltage spec of 3.6 V. The linear voltage regulator that feeds the whole board specifies a maximum output voltage of 3.63 V. For a given input current ...
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1answer
2k views

Do FETs have a Maximum Gate-Drain voltage?

I know FETs have a Absolute max \$|V_{gs}|\$, and a max \$V_{ds}\$. So can we assume, say for an N type, that: $$\text{max}|V_{gd}| = V_{ds} + |V_{gs}|\\$$
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117 views

IGBT SOA rating vs. Short Circuit rating

I have an IGBT (with integrated anti-parallel diode; forgive the BJT symbol in the diagram) that is switching an inductive load with a ~300 Vdc supply. The threshold voltage is ~5V and I'm driving it ...
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1answer
289 views

MIC6270 comparator - input voltage higher than supply rail

I've read in various places (such as here) that you can't safely feed an input voltage to an op-amp / comparator that's above its supply voltage, even when within maximum ratings. However, the ...
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1answer
141 views

Relay's maximum rating current and voltage

I'm looking at this Form C relay: IXYS LCC110 Its max load current is 120 mA and max voltage is 350 VDC. My question may be dumb, but can I use this relay to safely control a load that is only 5V but ...
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4answers
2k views

Is there a reason why we don't use higher rated voltage capacitors?

Recently purchased some components from a BOM for restoring an old tube radio, however it got me wondering about the capacitors and the voltage ratings.. Part of the order contained two 10uF ...
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2answers
249 views

DIY Powersupply cables

I am building a lab power supply that is going deliver 0-6 A at 0-35 V, maybe 40 V. The power supply is almost ready to go in use. On the power supply there are nice big banana connectors that can ...
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1answer
158 views

Can Cat5e cable be used for low current 120VAC signals (NOT in production environment - test only!)

We are preparing to deploy an industrial control panel. Before connecting the panel to the industrial equipment it will control, we want to provide training and allow the staff to practice using the ...
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1answer
128 views

Is it OK to drive a LED matrix with constant current?

I bought one of these LED matrix modules as described in this Adafruit PDF: https://cdn-learn.adafruit.com/downloads/pdf/32x16-32x32-rgb-led-matrix.pdf The PDF says "they do not have built in PWM ...
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2answers
383 views

Measure small voltages in a high voltage circuit

I'm troubleshooting an oscilloscope where the cathode voltage is ca. -2000V respect to ground and chassis. There are parts of the circuit (eg. the heater filament, or the blanking / un-blanking ...