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Questions tagged [specifications]

Specifications for an electronic component provide the basis for parametric part selection for operation or optimum performance of a circuit or to prevent damage to integral or connected circuit components.

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What determines I2C interrupt service time after address byte ACK?

I am looking at the NXP spec for I2C and what I don't understand is the timing constraint for the portion of the transmission where the "clock line held LOW while interrupts are serviced" (...
tronhawk's user avatar
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0 votes
2 answers
52 views

Sample and Hold IC specification

I am currently designing my 3rd year project in EE. I have an MCU with an ADC that samples at 15 kHz. The signal I want to sample has a 0.5 µs rise time which is equivalent to a bandwidth of 700 kHz, ...
Mandla's user avatar
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-1 votes
1 answer
83 views

What specs should i look for for a mosfet in this project? [closed]

I am a hobbyist and not a native so bear with me. I need a MOSFET that can switch at ~ 100 MHz and withstand up to ~ 40 V and 40 A with a variable duty cycle. If my calculation corrects 1/100 MHz ...
Tintin's user avatar
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1 answer
33 views

Origin and underlying sense of the term "Posted" in PCIe

When PCI Express replaced the operation of reading directly from a PCI peripheral card over a bus, directly addressing its I/O ports, or performing a configuration cycle on it directly, with instead a ...
BobH's user avatar
  • 11
2 votes
4 answers
145 views

Exceeding a relay's safety AC rating

I was wondering if it would be a safety hazard to exceed a relay's AC rating of 125VAC with 230VAC? Will it work? Here's the data sheet. I'm using the 5V variant. Image source: Mantech Electronics - ...
Zipho Lunika's user avatar
0 votes
1 answer
31 views

Voltage reference 1/f noise datasheet comparison

I would like to compare the 1/f noise of the voltage references LT1021 and LTC6655. The LTC6655 has a spec of 0.25 ppm (0.1-10Hz) and the LT1021 has 3uV_pp (0.1-10Hz). I assume these datasheet ...
Stefan Wyss's user avatar
  • 7,653
2 votes
1 answer
52 views

Isolation voltage spec in transformer

Could you please help me understanding this transformer spec? I am planning to use HCTSM80101AAL transformer and I would like to make sure that I am referencing the proper specification for voltage ...
Alia Sana's user avatar
1 vote
1 answer
400 views

Mean Well Power supplies have much lower efficiency and much higher leakage current than rated

I am going to have a power supply which will always be connected to AC mains and occasionally, a led strip will be connected and disconnected to the supply with a relay. I want an efficient and low &...
CaveScientist's user avatar
3 votes
3 answers
336 views

How to interpret External Clearance spec on HCPL3700M IC?

The spec for the HCPL3700M (AC voltage detection IC) lists an "External Clearance" of ≥7.4mm. Is this saying that no component or exposed trace should be within 7.4mm on any side of the chip?...
user272901's user avatar
5 votes
1 answer
145 views

Why are Lunar White LEDs not a standard part, or what am I missing?

TL;DR: Lunar White is a widely-used standard color in signaling work (like, every pedestrian signal that conforms to ITE specifications uses it, as far as I can tell), so why can't you buy Lunar White ...
ThreePhaseEel's user avatar
-1 votes
1 answer
107 views

What does 'Minimum Holding Voltage" refer to for a Thermal Fuse?

One of the components I am looking at for a new design is a thermal fuse. In the documentation it refers to a "Minimum holding voltage". Source: https://www.bourns.com/docs/Product-...
JohnFahey's user avatar
4 votes
2 answers
286 views

What is meant by TTL in this context?

Regarding this driver manual, the analog input has range 0-5 V with 1 MΩ input impedance. But the manual also writes that the analog input is not TTL compatible: I thought the term "TTL ...
GNZ's user avatar
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0 votes
2 answers
119 views

Calculate DC cable diameter

Please assist in defining the required DC cable diameter for the following requirements: Voltage: 48 volts Watt: 8500 watt Running distance: 50 meters
Ali Safa's user avatar
0 votes
1 answer
125 views

Transistor as switch that can handle a high base current [closed]

Which cheap, simple transistor can handle a high base current and doesn't need a base resistor to use it as switch?
Nonok cantik's user avatar
3 votes
1 answer
1k views

EDID emulation in HDMI and DisplayPort, is DisplayPort really more difficult?

I've been doing a lot research on EDID and HDMI and DisplayPort and I have a question about the relative difficulty of always-on EDID Emulation between the two specs. With HDMI, almost every Matrix ...
Evan Carroll's user avatar
6 votes
3 answers
738 views

Transistor choice for solenoid actuation

I'm a software guy trying to do a small electronics prototype project and need help with selecting a transistor. I know this must sound like a very basic question here, but this looks like a great ...
Coconha's user avatar
  • 75
0 votes
2 answers
69 views

Specs for obsolete relay OEG OL-C-212H12VDC

I've extracted a relay labeled OEG OL-C-212H12VDC from an early 90s Technics amplifier whose service manual refers to as RSY0009-0. It has an additional line indicating 9142 T. Its coil is busted, ...
Game Instance's user avatar
0 votes
0 answers
42 views

6 A, 30 VDC relay as substitute for a 5 A, 30 VDC relay

May I confirm on this forum if a 6 A, 30 VDC relay can be used as a substitute for a 5 A, 30 VDC relay? They have the same number of pins as well as holding coils orientation. I purchased a relay as a ...
Fed's user avatar
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8 votes
3 answers
3k views

Is HSYNC required during VSYNC for VGA?

As a development to my previous question I am developing a protocol to drive VGA through lines originally designed for SPI communication. The problem is that I may be able to instruct the receiving ...
Anonymous's user avatar
  • 7,120
0 votes
0 answers
24 views

Confused with parameter definition of spectrometer

Regarding this spectrometer specs, what is meant by "spectral sampling resolution"`? It is give as 2.55 nm. And how is that different from spectral resolution? The term "spectral ...
floppy380's user avatar
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1 vote
0 answers
528 views

Are there any published values for GPIO slew rate or rise/fall times on ESP32?

Are there any published values for GPIO slew rate or rise/fall times on ESP32? I had a look at the datasheets and couldn't find any. I also couldn't find any measurements elsewhere. Have Espressif ...
Polynomial's user avatar
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1 vote
0 answers
23 views

Clock division and duty cycle for ST8034P Smart Card interface

The ST8034 is a family of interface ICs for contact Smart Card. Here is the Data Sheet. My question is about the ST8034PQR. when the CLK output is active, does fCLK = fCLKIN or fCLK = fCLKIN/2 ? ...
fgrieu's user avatar
  • 1,670
3 votes
2 answers
108 views

Rectifier diode specs not clear

https://www.tme.eu/Document/e6d16d51cc343d73832bf32cc9d69d1f/p2500a.pdf How does that "RthA < 4 K/W 1)" work? ...
kellogs's user avatar
  • 1,061
4 votes
3 answers
952 views

Is the Rds(on) of a MOSFET typically specified at the boundary of the saturation and triode regions?

Datasheets specify the Rds(on) of a MOSFET at some specific gate-source voltage, e.g. 100mΩ @ Vgs=4V. Up until now, I assumed that the test gate-source voltage was essentially arbitrary and chosen ...
Polynomial's user avatar
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6 votes
3 answers
16k views

Is there a general rule to calculate heat dissipation of electronic equipment?

Is there a general rule for calculating heat dissipation in electronic equipment if it's not listed in the specs? I have a couple of projects coming I'm working on that require this. For one situation ...
Frank's user avatar
  • 293
1 vote
0 answers
82 views

Non-overlap time in auxiliary contacts on contactors

As long as I have tested, my standard contactors such as Schneider TeSys LC1D32A are equipped with (13-14) NO and (21-22) NC contacts, which never close simultaneously. For this device, the auxiliary ...
Brethlosze's user avatar
  • 1,427
1 vote
2 answers
155 views

Understanding voice voil actuator vendor specifications

I'm thinking of potentially using a linear voice coil actuator to move a 90 g mass between 0 mm and 1 mm and back in the horizontal direction with a frequency of 20 Hz. Assuming triangular ...
asyndeton256's user avatar
0 votes
1 answer
822 views

PID control with anti-windup time specifications

I have scoured the internet for a quite some time now and could not seem to find the answer to this. Is there a formula that approximates, with these specific gains (Kp, Ki, Kd, Kt), the rise time, ...
John.Apple's user avatar
1 vote
0 answers
66 views

NEC asic information from around 1990

I'm looking for datasheets with specification for the NEC ASIC/Gate Arrays from around 1990. More preciselly, any information with specifications of their ASIC/Gate Array lines. I would like to known ...
Hernandi F. Krammes F.'s user avatar
0 votes
1 answer
1k views

How to know if an opamp can drive capacitive loads?

There has been a lot of questions about how to stablise opamp circuits driving capacitive loads. However, I know there are some op amps that are designed to drive capacitive loads but I am struggling ...
yolt's user avatar
  • 113
1 vote
2 answers
1k views

What can I assume for the voltage tolerance of commercial 12 VDC equipment?

I am thinking about 12 V backup power supply options for my home networking equipment; these run from 12 VDC wall warts supplied with the equipment. The data sheets for such equipment typically say ...
Michael's user avatar
  • 23
9 votes
4 answers
1k views

10000 pF - so many zeros

Why are 10 nF capacitors sometimes (usually) specified as 10000 pF? Why are we trying so hard to avoid nF? Seems unnecessary and error prone. Note: Question also relates, of course, to 1 nF vs 1000 ...
Blair Fonville's user avatar
2 votes
2 answers
330 views

Questions about relays specifications

I want to use a relay to switch high power LEDs ON and OFF. Nothing out of the ordinary yet. My problem comes from the fact that my control voltage is not stable (it varies from 5V to 12V for example)....
Spyro 999's user avatar
-1 votes
1 answer
76 views

Interpreting spec sheets for an inverting op amp

I'm interesting in putting together an inverting op amp to take a signal voltage from 10 V to 0.01 V (Gain = -60 dB). By signal voltage I mean the current input and output will be low (e.g., <1 mA)....
biscuits-and-jamie's user avatar
0 votes
0 answers
96 views

Acceptable SNR for a Sound Level Meter

I'm designing a low power (<150mW) sound level meter (SLM) using a 24bit ADC (preliminarily using the LTC2512-24). This is for audible frequency range signals only (20Hz - 20kHz). I'm focused on ...
davegravy's user avatar
  • 439
1 vote
2 answers
52 views

How to use units given for heatsink thermal resistance?

In looking for a heatsink I came across a company giving the thermal resistance of extrusions in °C/W/3in. How do I use this? Say I use an extrusion with a specification of 1.5 °C/W/3in and get it ...
martin's's user avatar
  • 177
0 votes
1 answer
486 views

Is it ok for a DC socket 5.5x2.1 to supply higher current than in the specifications?

I have recently bought a DC socket similar to the one below: https://de.aliexpress.com/item/32681671586.html. It is only used as a plug to connect a small circuit with a heating wire so there are no ...
Sadikov's user avatar
1 vote
10 answers
2k views

Why is power specified in watts rather than amperes?

This probably has an obvious answer I'm missing, but searching the web only gave me information on how watts are defined, not why we use them. Many electric appliances (from things used to build ...
A. Owl's user avatar
  • 111
-1 votes
1 answer
93 views

Audio transformer power level

I am going to use SP-69. https://catalog.triadmagnetics.com/Asset/SP-69.pdf Its power level is 50mW. I am going to use DRV135 to drive audio transformer(SP-69). Output voltage of the DRV135 is 7Vrms(...
Lee Jason's user avatar
0 votes
1 answer
157 views

reading specification sheet of a cable

I'm having trouble reading the following specification sheet: https://www.molex.com/pdm_docs/ps/PS-15166-001-001.pdf if it doesn't work, I just pressed the datasheet button in this product: https://...
E. Ginzburg's user avatar
18 votes
4 answers
8k views

Electrical reason for the minimum altitude (-50 feet) in the computer specs?

Are if there any electrical reasons not to operate or store my Dell OptiPlex computers below the altitude of -50 feet, as written in the specifications? Screenshot of the original Dell OptiPlex ...
eXtranium's user avatar
  • 183
2 votes
1 answer
828 views

Understanding ADC input voltage range from its specifications

I want to use this ADC, an LTC2344-18, a quad, 18-Bit, 400ksps ADC. On page 15 you can see that the analog voltage input range can be set to +-Vrefbuf. Vrefbuf can be set to 2.5V to 5V. This would ...
Yoomo's user avatar
  • 363
2 votes
2 answers
180 views

What are the standards for hand placing components?

Is there any written specification for the orientation of components on a manually assembled PCB, including both THT and SMT passive components? 'Manually' because machines can be easily setup to ...
Rob Kam's user avatar
  • 1,325
-1 votes
1 answer
99 views

Spec sheet notation: 2 dots between numbers

I was comparing spec sheets for the AH3503 and the SS49E when I ran into notation I have never seen before: a number, followed by 2 dots, followed by another number. What does this notation mean? ...
The Bic Pen's user avatar
0 votes
3 answers
321 views

How are desired specs decided upon in a common emitter amplifier circuit? (beginner)

I have been reading up on amplifier circuits recently out of curiosity and would like to attempt designing my own. However, I would first like to understand how various amplifier specifications are ...
frc_contributor's user avatar
2 votes
3 answers
2k views

Are "anti-surge resistors" just regular resistors?

I am looking for high-power SMT resistor, and found this guy: My question is: what does "anti-surge" mean, in the context of a resistor? Is it just the suggested application (a crowbar ...
FrancoVS's user avatar
  • 1,563
2 votes
1 answer
2k views

Can MOSFET exceed breakdown voltage without being permanently damaged?

I just have a simple question that I can't find a simple answer to anywhere. Is it possible to exceed the breakdown voltage of a power MOSFET (to short circuit it) without causing permanent damage? ...
eeScott's user avatar
  • 21
1 vote
0 answers
70 views

What does the electrolytic capacitor specification E 9 A 105 CF mean?

What do these electrolytic capacitor specifications mean? E 9 A 105 \$^\circ\$CF Is its maximum temperature 105 Celcius or 105 Farenheit? It has both letters.
user avatar
0 votes
1 answer
59 views

What do these forward currents at specified wattages mean?

An LED I'm looking at has various specs listed that I can't make heads nor tails of. It is listed as a "3W LED" supporting a 2.5V minimum and 3.6V voltage. However, "Forward voltage&...
Bas's user avatar
  • 473
9 votes
1 answer
3k views

What are the 9V battery terminal size specifications?

I'm trying to find the dimensions of a 9V (PP3?) battery (no specific chemistry). For some reason it's giving me a lot of trouble. I've been able to find most of the information (I checked a bunch of ...
Jason C's user avatar
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