Datasheets are the primary documentation about components, describing their functionality and electrical properties.

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2
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1answer
109 views

Does the MOSFET Rds(on) value really matter?

I am using MOSFETs in the ubiquitous RAMPS 1.4 Arduino shield for 3D printing use. The MOSFETs switch the voltage to the heated bed and the hotend (where the filament comes out). I need to replace ...
1
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1answer
51 views

What is power dissipation capacitance?

This question is derived from the answer to another question What is the input current of the 74HC595 The answer makes a note to the OP, that he should also consider power dissipation capacitance. ...
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2answers
35 views

Forward current for assorted LEDs

I have an assortment of T1 and T1¾ LEDs from sampler kits and beginner kits. The kits have sketchy documentation, with missing or inaccurate part numbers. I was able to track down datasheets for some ...
0
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2answers
33 views

Help with sensor output and data sheet

Here is all the circuitry I have. I only found thisdata sheet which may be for this anemometer: http://www.synchrodan.hu/letoltes/kriwan/kulsoerzekelok/szel/N292_INT10K_69000248_e.pdf What I ...
1
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1answer
54 views

Abstract Datasheet Dimension Notation

I am attempting to create a footprint for a Surface Mount Component and I am using the manufacturer's datasheet for reference. They include PCB dimensions but the notation used is a bit confusing. It ...
0
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1answer
52 views

What does the CT (center tap) value mean in a transformer datasheet?

I came across this datasheet, and I am unsure what the CT portion means. The datasheet does say that CT means center tap, but specifically in the image below what does the "10k CT" betweeen primary ...
0
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2answers
47 views

IRF740 datasheet. Error in the datasheet or I'm interpreting it wrong?

According to the IRF740 data-sheet from IR or from Vishay (they are nearly the same, the Vishay is better to read), the Qg is specified as 63nC under Id = 10A Vds = 320V and Vgs = 10V. But at page 4, ...
4
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3answers
95 views

What precisely is \$R_{ds(on)}\$?

I keep getting conflicting answers on this and it's absolutely killing me. Some say \$R_{ds(on)}\$ is the contact resistance in the FET (for instance, make many FETs of varying channel lengths, turn ...
0
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1answer
35 views

Datasheet supply voltage range

I am reading though a datasheet of TL064 and I am unable to find supply voltage range of this component. I've experienced this couple of times with datasheets... Farnell states its supply voltage ...
2
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1answer
29 views

How are C(OBO) and C(IBO) defined?

In a datasheet like this one, how are \$C_{OBO}\$ and \$C_{IBO}\$ defined? What I know: C for capacity O for output, respectively I for input B for base O for open, not connected But with ...
0
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1answer
38 views

Sony Xperia Z1 - Camera Module Datasheet

I'm writing to inquire about technical data related to the Sony IMX220 image sensor, as found in the camera module of the Xperia Z1. I will be interfacing with the module and require a datasheet ...
0
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2answers
34 views

Buck Converter Error Amplifier Input Polarity Confusion (TL598)

I'm trying to design a buck converter using TL598. I'm studying the technical article Designing Switch Mode Power Supplies With the TL598 - Application Report for this purpose. This article references ...
4
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3answers
237 views

Why do capacitor datasheets avoid directly giving the ESR value?

Most datasheets give a parameter called "loss tangent" instead of directly giving the ESR value. Why don't they just give a numeric value for it? Why is loss tangent preferred over ESR? Is there ...
1
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2answers
51 views

Hooking up an 8x8 LED board

I recently bought this 8x8 LED board from geeetech which came with this datasheet. I'm new to programming so I bought this board to "figure it out" but now I'm running into issues I don't understand. ...
3
votes
1answer
79 views

What does “Sourced from process <number>” mean in transistor datasheet?

On first page of Fairchild BC516 transistor datasheet it's written: Sourced from process 61 What does it mean? Is it important for part's users or it's some kind of production process ...
0
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1answer
39 views

Resistor programming of a boost converter, check my understanding?

I'm looking at the datasheet for a TPS6103 boost converter, and trying to figure out how to configure it for 5V 1A output. The datasheet is not making this easy to understand. Datasheet: ...
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3answers
91 views

Determine saturation base current from NPN transistor datasheet (or what resistor do I need to ensure saturation?)

The Fairchild 2N3904 has a long data sheet so let's use that for this exercise. I'm interested in using an NPN in common emitter configuration --- it's for switching. It's my understanding that an ...
0
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3answers
63 views

How to convert noise to noise density in mic pre amps

I am trying to compare two low noise mic pres for the lowest noise, and I am looking at the TI1012 and MAX9814 MAX9814: ♦ Low Input-Referred Noise Density of 30nV/√Hz TI1012: Output Voltage Noise ...
1
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1answer
53 views

Question about a dimension in this IC package drawing

this is the first time I'm making a PCB layout, so I'm not too familiar with datasheets. The picture below shows a diagram for an IC I'm using. The datasheet says all dimensions are in mm. However, ...
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2answers
94 views

Datasheet for a DU1PU relay?

I took apart an old microwave oven and found the relay the computer chip closes to activate the magnetron. The relay is a DEC DU1PU, made in China. Does anyone have a datasheet for it? I'm mostly ...
1
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1answer
106 views

Where to find the data sheet for Huawei Honor 6 smartphone?

The smartphone seems to have bq24190 chip for power and charging control (according to /sys/), for which the data sheet specifies that it can be powered not only ...
2
votes
2answers
219 views

How can I tell if a given MOSFET can be fully driven by 5V TTL high signal? (what should I look for on the datasheet?)

How can I tell (by reading the datasheet) if a specific MOSFET can be turned fully on (with the minimum drop) with simply 5V on the gate? (assuming 5V or 12V potential between the drain and source). ...
0
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2answers
78 views

Google has no datasheet for ACX502ALM-7 LCD/resistive touchpanel

I have an ACX502ALM-7 series LCD+touchpanel combo. Google cannot find me a datasheet for it. Can any one of you? I'd like to possibly interface it (at least the touch screen part) to an Arduino Uno. ...
0
votes
1answer
23 views

What's the difference between logic/if system and drive system of a display?

I've been looking at the current consumption of a display and the datasheet says the following: Can anyone tell me the difference between "drive system" and "logic/if system"?
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2answers
42 views

Diode voltage rate of change and junction capacitance

I was looking through some schottky diodes and saw in their datasheets, that they have characteristic called voltage change of rate [dv/dt]. Most of those I saw have it exactlly 10000. Now, in ...
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2answers
37 views

Deciphering datasheet descriptions: “normalized series 54/74 load”

I was reading something when I came across a project using the SN74180 parity checker IC. I begin looking at the datasheet when I came across this description: The SN54180/SN74180 are fully ...
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0answers
33 views

Datasheet for Panasonic MN6627971KB

I have been looking for a datasheet for this chip Has 4 printed rows of text as follows Panasonic MN6627971KB 515U5031 JAPAN 128 pin located in a car audio system. Could be a model specifically ...
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1answer
53 views

Choosing sampling rate according to the bandwith reponse in accelerometer datasheet

In an accelerometer's datasheet, the bandwidth response in the x and y axis is 350 Hz. There is another information related to the internal sampling rate (shown below). I don't know how these two ...
2
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2answers
58 views

Is a switches voltage and current rating a hard limit?

I have a need for a switch that can handle 28Vdc at about ~1A. The switches I would like to use have a rating of 24Vdc at 5A. I would think that the limit of switch is the power, so if we take a ...
10
votes
1answer
194 views

How does the CMRR of difference amplifier ICs change over time?

When designing precision analog circuits, I often come across parts which seem to be more than accurate enough for my purposes, but where the datasheet does not specify how key parameters will change ...
3
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2answers
69 views

Reading Diode Datasheet

I am learning about Diode and its use (Just get interested in electrical stuff after reading a DIY project), I have been reading information around and want to get more understand on diode especially ...
0
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0answers
22 views

working of a single acting solenoid contactor

I am working on a unfinished project where one of the 2 motorcontrollers is connected to a single acting solenoid contactor (SW200-29). I have been reading the datasheet a few times now and I don't ...
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0answers
97 views

TLC5940 - Interfacing With PIC18F - Is “Counter Overflow” A Problem?

When I wrote some driver code for the TLC5940 on the ATMega328P, I used two timers to drive the GSCLK signal and the BLANK signal. If I remember correctly, both timers were running off the same ...
0
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1answer
94 views

Difference between an inverter and a buffer with active low input

In logic diagrams found in datasheets (e.g. Texas Instruments 74HC316) I've often seen both inverters and buffers with active-low inputs ("negated buffers" or "inverting buffers" or whatever they are ...
2
votes
2answers
249 views

Understanding the Texas Instruments CD4075 datasheet table

I downloaded the CD4075 IC datasheet and I'm having trouble understanding the lines labelled "Output High (Source) Current" in the table below. The table shows current values relative to temperature ...
12
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5answers
1k views

Meaning of crossed wires in schematic

I am reading a datasheet of a motor and I keep seeing wires crossing each other and crossing them again. (see the picture below). Does anyone know what this means? EDIT: I also see this picture in ...
1
vote
1answer
41 views

Tactile pressure sensor and drift. Reading the datasheet

I am looking at the specs of tactile pressure sensor and I can't understand what this means: "Drift: <3.3% per logarithmic time scale" How should I understand this? Does this sensor drifts a lot ...
0
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0answers
207 views

Datasheet for Keyes IR Transmitter (KY-005) wanted

Can someone help me find the datasheet for the Keyes IR Transmitter (KY-005)? I know how the pins work, I just need to figure out its voltage drop and how much current should go through it. Thanks! ...
0
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2answers
40 views

What is Vcc-2 referring to in the Texas Instruments Tech Sheet for the SN74AS138?

Total noob here. The tech sheet can be found here: http://www.ti.com/lit/ds/symlink/sn74as138.pdf In the VOH parameter for the SN74AS138 on page 5, it states that it's MIN is VCC-2. What does that ...
0
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0answers
36 views

Sony RMT-CE75A protocol

I am planning to use an old Sony remote I found around my house for a remote control project. It has the remote number RMT-CE75A and it says Radio Cassette. I am trying to figure out the protocol ...
0
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0answers
29 views

Can DRV8837 be used to drive two DC motors in all four ways?

Knowing that some motor drivers do not perform well under low input voltages, I have found that this works well; but how do I drive motors in the following four ways: ...
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0answers
40 views

How do I find the maximum surge current of a zener from the given thermal resistance curves?

I'm driving a MOSFET, and I want to protect its gate with a zener diode. Here is the MOSFET data: ...
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1answer
132 views

Which one of these transistors is equivalent to 2N918 NPN?

This is an FM radio receiver. Q1 is 2N918 NPN transistor but it is not available for me. Which one of the following transistors is more equivalent to Q1 ? BC547 TL431 s8550 s9014 2n5401 ...
2
votes
2answers
156 views

STM32F103 - TIM5 doesn't exist on medium density devices ? How do I tell what else is missing?

I've tried setting TIM5 as a timebase timer with an interrupt, when the compiler gave me the following error: 39: error: 'TIM5_IRQn' undeclared (first use in this function) Than I though I'll ...
4
votes
1answer
115 views

Driving 259mA stepper motor with a 2N4401

A while ago I asked a question about driving a stepper motor using a 2N5550 and was advised that it wasn't really capable/a good idea. I received a good answer but would like a bit more information ...
2
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2answers
303 views

unusual transistor markings “C8550”

I am repairing a "wall-wart" charger for a Black and Decker battery powered edger which uses a 12 volt/7 amp hour battery. It has ceased to deliver charge current to the battery but the half wave ...
0
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2answers
388 views

Panasonic Eneloop BK-3MCC (4th gen) - where I can find maximum discharge current?

Im looking for some official information source about maximum current for Panasonic Eneloop BK-3MCC rechargeable batteries. All I found is single page data sheet, there is just 1 table (nothing about ...
5
votes
2answers
160 views

What does 25°C mean on a transistor data sheet?

The background is, I'm trying to understand how well a typical transistor obeys the Ebers-Moll equation at constant (junction) temperature. See this snapshot taken from the Fairchild datasheet of the ...
-1
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1answer
29 views

Pinout for EA-X40027AR

Can anyone show me a pinout for the Character LCD EA-X40027AR from EPSON? I've already found a datasheet but it has no pinout...
0
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1answer
104 views

Unusual Lemo PCB sockets (male PCB contacts, 2-pin 5B, etc)

I am trying to construct a comprehensive Kicad library of Lemo connectors. While working through the "normal" datasheet (unipole_multipole.pdf), I found several combinations appear to be missing. For ...