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Questions tagged [dimensions]

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Lithium polymer battery size versus energy density

I am building a small device that needs to use a rechargeable lithium polymer battery. The dimensions I am looking for are 351125 { 35 mm (H) x 11 mm (W) x 25 mm (L) }, which is the standard way these ...
Sreenivasa Chary's user avatar
1 vote
1 answer
49 views

Faston/Lucar blade thickness

Does the blade thickness of Lucar/Faston-type connectors vary methodically with both blade width and "colour" i.e. wire rating? I'm looking at some UPS cells with blades which appear to be 0....
Mark Morgan Lloyd's user avatar
0 votes
3 answers
135 views

Alternative to pull-up resistor

I am building this AND gate, and I managed to get it to work properly. However, I had to increase the value of the pull-up resistor to 3 megohms which is too big for what I need. However if I don't ...
Jake's user avatar
  • 113
0 votes
1 answer
135 views

Capacitor taping Vs straight leads

I can't understand what means in the datasheet below where it writes "Lead Space: Taping or Straight". With taping means that the leads have outside bend in order to increase the pitch ...
DarkKnight's user avatar
0 votes
1 answer
130 views

Does anyone know the physical dimensions of the Microchip PICkit4 programmer?

Does anyone know the physical dimensions of the Microchip PICkit4 programmer (PG164140)? It would be useful to know so that I can leave proper clearance on my PCB around the programming header. I ...
user4574's user avatar
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2 votes
1 answer
3k views

What is the maximum height (thickness) per slot for a finished (soldered/populated) PCI express card?

The main question is: Defined by maximum allowable height from the surface of the PCB on both sides (soldered pins and components), or whatever metric experts think would be most useful in decoding an ...
Rook's user avatar
  • 184
1 vote
3 answers
295 views

AutoCad Eagle: dimension markings not rotating correctly

I have a library component in AutoCAD Eagle. I want to include dimension markings on the Reference layer. I opened the component library, and used the Dimension tool to mark the dimensions I need. I ...
Chris Fernandez's user avatar
2 votes
1 answer
412 views

Have AAA batteries gotten shorter? [closed]

I'm finding that the standard AAA battery from most manufacturers (including Duracell and Energizer) have gotten shorter and don't fit as tightly in my alarm clock and HP-48 calculator. The old ...
D Duck's user avatar
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0 votes
3 answers
54 views

Does the length of a pad's edge include the radius?

I'm making a footprint for a part, and I'm unsure how the length of an edge is defined. I've circled in red the two dimensions that are confusing me. For example, does the 0.1 indicate the length of ...
sgdsgyhetwaraw's user avatar
1 vote
1 answer
147 views

Cable dimension for different loads

I have 40 loads connected to the same power supply. If every load draws 0.5 A in current and all of them 20 A. According to this I need cable dimension of 2.5 mm² for the main cable and then 1.5 mm² ...
acroscene's user avatar
  • 179
1 vote
2 answers
193 views

Find a commercial transistor with known channel width, channel length, dielectric thickness, etc for experimental purposes?

I want to buy a commercial transistor, with known dimensions (channel width/length, dielectric thickness, materials etc.) This data is necessary to select a transistor most compatible with my ...
Leo's user avatar
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3 answers
3k views

Ideal dimensions for an electromagnet?

I've been working on a design for an electromagnet. I've exprimented various lengths of core, and figured the height of the windings for 6 different gauges of magnet wire based on the maximum current ...
Brandon Thompson's user avatar
0 votes
3 answers
180 views

Why is 'density' different for current?

Considering an N-type semiconductor, when we talk about carrier density, it means number of electrons per unit volume. But, when we define current density(J), it is measured as total current per unit ...
Abhishek's user avatar
2 votes
2 answers
230 views

ψ used as diameter, which unit is this?

I am designing a PCB footprint for this part: https://www.meanwell.com/productPdf.aspx?i=685 On page 4, the pins diameters are indicated as: diameter:1ψ and diameter:2ψ Also, on the quotes, they are ...
user1937747's user avatar
1 vote
1 answer
155 views

MOS chip dimensions

I am looking for the physical dimensions to some chips used on the VIC20. Looking at the datasheet http://www.6502.org/documents/datasheets/ the document is cryptic, not much conclusive because it ...
ahwelp's user avatar
  • 13
0 votes
1 answer
312 views

Eagle Cad Resize PCB

I am having trouble resizing the PCB after components have been placed. I know this is not the usual method, but I have been given a .brd file and .sch and the board dimensions were decided already. ...
diskosteppas's user avatar
0 votes
2 answers
117 views

PCB specs, Meaning of "6-1" diameter

I'm using a relay for a PCB, but have trouble understanding some of the specs for the recommended hole drill sizes. As shown below, the spec sheet indicates a "6-1" diameter hole. What is ...
plu's user avatar
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0 votes
2 answers
345 views

Help understanding the dimensions of the 1N4007-SMD's datasheet

I'm trying to understand what are the real dimensions of the following diode: http://www.sycelectronica.com.ar/semiconductores/1N4007-SMD.pdf For simplicity, here is a screenshot of the relevant part ...
Ian Liu Rodrigues's user avatar
-1 votes
2 answers
136 views

What is the meaning of these datasheet dimensions?

I am trying to buy a part for a project and I can't seem to understand what, ("B = A + 0.83[4.00]") means. Is this datasheet in mm or inches? Your help would be greatly appreciated.
Mick Kelly's user avatar
6 votes
1 answer
922 views

What is the correct pin spacing for this footprint?

I'm trying to import an IC footprint into CAD software and can't seem to nail down the exact dimension for pin spacing. The two supporting documents seem to conflict with each other (Land Patterns ...
Tanenthor's user avatar
  • 260
0 votes
4 answers
237 views

Simulation of 2D vs 3D electromagnetic waves

If you using a simulation tool that allows you to simulate behaviour electromagnetic waves in an environment. What differences are there in terms of doing the simulation in 2D vs 3D? Does doing the ...
JoeyB's user avatar
  • 2,371
7 votes
2 answers
2k views

What are the max. overmold dimensions for USB-C plugs?

In contrast to earlier USB specs, the USB-C specification doesn't seem to define a maximum width and height of the overmold part of the plug (according to figure 3.3, there is just a length defined). ...
Philippos's user avatar
  • 182
0 votes
1 answer
79 views

Do enclosed switching power supplies follow any standard for their chassis size and mounting hole distances?

Do enclosed switching power supplies follow any standard for their chassis size and mounting holes distances? or each manufacturer has its own conventions?
Microsoft Linux TM's user avatar
2 votes
1 answer
220 views

PCB Thickness Variability

How much variability is there in the thickness of a standard PCB? Let's say I order a 1.6mm FR-4 board. Will the actual thickness range 1.5mm-1.7mm? 1.4mm-1.8mm? 1.59mm-1.61mm? What is the (...
T. K.'s user avatar
  • 105
0 votes
1 answer
202 views

Understanding PCB footprint for ESD321DPYR

Looking at the datasheet for component ESD321DPYR, the PCB footprint looks something like this (copy and paste from page 16): However, the footprint I downloaded from Library Loader here, a trusted ...
Berry's user avatar
  • 13
3 votes
0 answers
272 views

How to find the right connector?

I have gotten the task of finding an appropriate connector for our application, but given so much information there is on connectors, I don't even know which information is relevant. So this is the ...
Samo Smodis's user avatar
2 votes
1 answer
1k views

General dimensions and recommendations for a USB dongle

I'm trying to create a device that connects via USB and sits in a users computers USB socket at all times, and I'm unsure of what the general dimension requirements will be. Ideally, this device ...
mkroman's user avatar
  • 121
0 votes
0 answers
139 views

Where to find details of dimensions and doping of a typical bjt

I have been searching for dimensions and doping levels of base, emitter and collector for a typical bipolar junction transistor presently in use. I have tried searching on internet and seen datasheets ...
Kutsit's user avatar
  • 261
0 votes
2 answers
104 views

Is miniaturization of office device A/C adapters feasible?

Today I looked upon my desk: as you can see in the screenshot below, there are three plastic boxes containing A/C adapters for (I think all in the 12-20V and 1-2A range): screen device notebook ...
J. Doe's user avatar
  • 101
1 vote
1 answer
203 views

Meaning of a potentional tolerance value for a dimension in a mechanical drawing

The mechanical drawing below contains two dimensions (2-Ø2.30 and 4-Ø0.92) that I can't make heads or tails of. I have spent quite a while researching mechanical dimensional and tolerance conventions ...
Benedikt M.'s user avatar
0 votes
1 answer
360 views

Intel max 10 dimensions - datasheet & BSDL mismatch

TL;DR: The BSD file from Intel doesn't match the datasheet. What are the right dimensions? BSD: https://www.intel.com/content/dam/altera-www/global/en_US/others/support/devices/bsdl/10M02SCM153.bsd ...
Eggi's user avatar
  • 334
2 votes
2 answers
702 views

Datasheet part dimensions [duplicate]

I'm trying to draw up a part in EAGLE, but am having a hard time making out the datasheet dimensions: For example, with the pin width, it's not clear whether it's 0.51 (mm, I presume) or 0.31. ...
19172281's user avatar
  • 743
0 votes
1 answer
172 views

sizing voltage regulator [closed]

I am to size a 3v3 voltage regulator, It gets at its input 12VDC maximum. And the load can consume up to 150 mA (few leds, 20 NMOS control, ADC control, microntroler supply...) and ambient temperature ...
RPerun's user avatar
  • 83
12 votes
3 answers
53k views

Difference between 1206, 0805 and 0603 SMD resistor

What is the difference between a 1206, 0805 and a 0603 SMD resistor, as far I know they all have a resistance of 10.7K? I going to need one for my little 5v DC buck converter.
Artonn's user avatar
  • 125
1 vote
1 answer
1k views

SD Card pins dimensions

I am trying to create an SD card from a PCB. My problem is that I cannot find the SD card specification that would give the: Dimensions of each Pin Placement of each Pin All specifications I could ...
Łukasz Przeniosło's user avatar
-7 votes
2 answers
135 views

ATmega168 Dimensions

Anyone has the dimensions of the ATmega168? The on-board one, not the through-hole one. I need it, and after searching in the datasheet, I couldn't find it.
Arnyminer Z's user avatar
3 votes
3 answers
2k views

Reading dimensions for datasheet

I have the following PCB datasheet, but I am very uncertain as to what it is saying. Some of the dimensions each have 3 numbers, which I took as nominal, minimum and maximum values, however, the sides ...
Samyak Shah's user avatar
0 votes
1 answer
172 views

whats is the difference in these dimensions

I am wondering what's the difference in these both highlighted dimensions.
Nouman Tajik's user avatar
0 votes
1 answer
225 views

What is the measurement grid in the context of strain gauge?

The sensor I am investigating is the 1-LM11 by Omega. I am looking at the specification at there are two metrics which confuse me, the measurement grid A is 1.5mm while measurement grid B is 2.5mm. ...
mega_creamery's user avatar
0 votes
2 answers
219 views

Datasheet unclear on the dimensions of the 16 pin SMD part

I am planning on using a quad optocoupler IC named ISQ203XSM (http://www.farnell.com/datasheets/90948.pdf?_ga=1.159355187.80908598.1463646290) and am confused regarding the dimensions of the SMD ...
Rhydo N's user avatar
0 votes
3 answers
693 views

Altium Panelizing

I want to send my board to production however i am not sure a component's actual sizes because there is not enough information on its datasheet. I put its image and the necessary dimension "x". This ...
layout789's user avatar
  • 363
-4 votes
2 answers
398 views

I need help with designing my first PCB on Proteus?

I've placed the component of a simple power supply circuit on PCB layout screen using auto-placer and auto-router. I would like to know many things about dimensions: Is there a standard space ...
Michael George's user avatar
1 vote
1 answer
133 views

what does this number(spacing between pads) in the datasheet mean?

i am going to design footprint for a devise and i need to know spacing between pads. do you know what does (2-1.27) mean? the devise is pico oem socket. thanks
Mohammad Jafari's user avatar
0 votes
2 answers
1k views

Altium PCB dimensions

I am looking for a way to automatically update the PCB dimensions in my PCB documentation. I have the X & Y dimensions listed in the title block as PCB strings. They are currently set as project ...
Ken Weiner's user avatar
-1 votes
1 answer
201 views

US Non-Polarized Plug Dimensions [duplicate]

for academic purposes I'm doing a very specific task where i need to calculate the Cell Constant of an American Non-Polarized Plug, ie, without same length the prongs. So I need to know what are ...
Impe_dancer's user avatar
1 vote
1 answer
2k views

SOIC‑14 package dimensions confusion

I looked at the dimensions drawing of the SOIC‑14 package from texas instruments. But I am a bit confused about the way texas instruments marked some lengths. Why there are two values seperated by a ...
Michael's user avatar
  • 285
0 votes
2 answers
216 views

Confusion on dimensioning power supply and fuse for a motor

I have the servo-motor model called MAC140. Here is a long manual including all other types of motors of the same company: http://www.jvl.dk/files/pdf-1/user%20manuals/lb0047gb.pdf If I go to section ...
user16307's user avatar
  • 12.1k
0 votes
2 answers
3k views

5-pin DIN socket advertised as MIDI, not the same as on my MIDI gear

I bought a 180-degree 5-pin DIN chassis-mount socket dirt-cheap for a project, but I saw that it looks quite different from the MIDI outs on my MIDI gear; I did some research but couldn't find any ...
Chuckk Hubbard's user avatar
1 vote
1 answer
169 views

How high is the TLC5940?

I've got some TLC5940 PDIP package ICs coming in the mail in a couple weeks or so, and in the meantime I'm designing a couple boards for them. I'm trying to figure out if the TLC is short enough ...
Keith M's user avatar
  • 184
7 votes
4 answers
3k views

What does "V.A." mean in datasheet dimensions?

I'm looking at a datasheet for an LCD panel (pdf link to datasheet). I don't understand these two encircled dimensions: What does the acronym "V.A." mean for these dimensions? I have ...
skrrgwasme's user avatar