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

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Datasheet MICS2614 - calculate sensor resistance R100ppb

The Datasheet of MICS2614 gas sensor shows the sensor resistance Rs/R100ppb over the O3 concentration in a graph. But as far as I can tell R100ppb is nowhere defined. The datasheet only shows R0 ...
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46 views

Frequency of motor vibration with different voltage

I'm using a motor shown in the link below. http://www.adafruit.com/product/1201 The product page is not showing the detail of how the frequency of vibration changes with different voltages. I sent ...
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2answers
37 views

MOSFET/IGBT Current capacities and SOAs

I need to switch off a 20V 60A DC current electronically. I don't want to use a relay, due to the environment (vibrations etc.). It is not a switching supply, just a switch that turns everything off ...
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1answer
40 views

Understanding Schmitt Trigger from datasheet

I've asked this question before, but I don't think I worded it correctly, as I got answers to a question I didn't intend to ask... So I'm giving it another shot: I am having some difficultly ...
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25 views

Finding RPM & voltage of undocumented step motor

I'm trying to run a EM-483 step motor from Epson printer. I can identify the coil wires (A+,...
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98 views

Extract firmware of an old electronic toy

I'd like to extract the firmware of an old electronic toy. Is has two electronic components, made by Texas Instruments: a PC35303NL - QB 8649, which is the main controller I guess TMP50C40AN2L - ...
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3answers
69 views

How do I determine \$R_o\$ for an op amp?

I understand that when driving a capacitive load with an op amp, the output resistance, \$R_o\$, of the op amp interacts with the load capacitor to form a low-pass filter, introducing a pole in the ...
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5answers
131 views

What is the maximum voltage drop on an LDO?

I'm a long time lurker :) How do I tell what is the maximum voltage drop an LDO can handle? My mentor explained adjustable LDOs like this to me (paraphrased of course): "An LDO is essentially a ...
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1answer
42 views

Understanding input voltage noise of AD8232

AD8232 has a built-in instrumentation amplifier with a fixed gain of 100. I am interested in using this device for amplifying EEG signals. Page 3 of the linked datasheet describes input voltage noise ...
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1answer
94 views

Tolerance of a ceramic capacitor

I have a ceramic capacitor that reads "101 Suntan" (and nothing else.) Reading up on how to interpret capacitor labels, I believe this capacitor is 100pF. I'm having difficulties trying to determine ...
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1answer
55 views

Solar cell electrical model from datasheet

I would like to build an electrical model for a solar cell based on its datasheet specifications. As an example, I retrieved one from Digi-Key: ...
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1answer
75 views

Reverse polarity protection for LiPo

I'm looking at using the S-8261 for reverse polarity protection. On page 24, it reads R2.. Select a resistance as large as possible to prevent large current when a charger is connected in ...
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2answers
36 views

CD4017BE IC datasheet confusion

I am going to incorporate this 4017 in a circuit and I have downloaded its datasheet,but I can't understand some parts of it. What is the max Vdd current? And the max current & voltage of the ...
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28 views

Cannot find datasheet on LCD inverter

I recently took apart a HP Pavillion dv7-1170us, and inside, I found an LCD CCFL inverter: PWB-IV11150T/L5-E-LF After doing a search, all I could find were people selling the part, but with no ...
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1answer
25 views

ATtiny861A: ADC reference voltage should be 1 Volt under AVcc?

I just faced with that ATtiny861A datasheet forcing me to use analog reference voltage to be at least 1 Volt under analog supply voltage: Let me doubt this datasheet statement for two reasons: ...
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2answers
418 views

Confusion around a components pins

I'm looking to use a RBO40 reverse battery & over voltage protection. I was unable to find the RBO40-40T (with 3 pins) anywhere so had to get RBO40-40G, which is slightly different, it has the ...
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2answers
103 views

Sourcing a transistor and base resistor

I'm aiming to find a transistor that will be used to switch a relay, and can handle the following specifications. I think I've found one and would appreciate having the calculations checked and ...
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2answers
98 views

Where can I search components according characteristics, not model?

I'm 2 years disconnected of electronics, and i don't know how i get and know the components i used, and i want to get and know few more components, but i can't get to know them... and well i was ...
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3answers
123 views

Finding gain from a transistor datasheet

I'm trying to work out the gain of a transistor, the datasheet is here, although I have extracted the relevant images here: The datasheet gives the gain for Ic=5mA and Vce=2V as 25, and the ...
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4answers
742 views

Is this transistor datasheet correct?

I was about to post a question asking for a schematic critique, although while checking things I've noticed a few things on the transistor datasheet that strike me as being a little strange. The ...
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1answer
85 views

Do AC voltages on datasheets refer to peak voltage or Vrms?

I'm attempting to find a relay to switch UK mains voltage (230Vrms); this gives a peak range of approximately 325V, -325V. Consider something such as the datasheet for this relay. It has a ...
6
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1answer
145 views

DAC datasheet term confusion: FS-1LSB

In the Digital to analog converter HP16BME, I keep stumbling into " +FS - 1LSB " and I'm not sure what it means. I mean, I still don't know the exact scale value because I don't know what FS stands ...
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3answers
286 views

What to choose hFE or beta from the plot of transistor's datasheet

Suppose I have this BC635 transistor, if I look at hFE then I'd say that the lowest value is 25 from that table in the ...
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5answers
2k views

How to Transition from “Basic” Microcontrollers to ARM Cortex?

I have many years of experience with 8-bit cores from various manufacturers - namely 8051, PIC, and AVR - and I now have a Cortex M0 to figure out. Specifically this one, but I hope we can be more ...
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22 views

How to obtain approximations to the linked magnetic fluxes of a BLDC from its specifications?

I'm using the following expression to calculate the electromagnetic torque in a BLDC: $$ T_e = ...
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3answers
299 views

Looking for capacitance and voltage rating - How to read electrolytic SMD capacitor labels

I need to replace an SMD capacitor on a board. The printing on it says F1 560 2.5z I have googled intensely but have been unable to find information on how to read such a codes. I need to find out ...
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1answer
85 views

Where can I find correct documentation of old floppy drive formats?

I have an old drum machine with an ancient proprietary 3.5" SONY floppy disk drive with no information on the device itself that I have seen. The performance is spotty and it's very picky about disks. ...
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1answer
18 views

ATtiny861 pin change interrupt on PA.2: error in datasheet?

I faced with some confusion in subject datasheet: In one section PA.2 should be masking by PCIE1 bit as PA.2 is PCINT2 input and it should be within PCINT[7:0] and PCINT[15:12] range: On the other ...
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1answer
41 views

What does Limit at Min to Max values in datasheet means?

I have doubt while implementing I/O SPI interface for the ADF4158 PLL Synthesizer. I planned to use a simple I/O model to send bytes (using only 3 bits for 3 lines) using RS232 at 115200 BPS. I didn't ...
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1answer
40 views

A6627SJP-T datasheet

i have this A6627 component in the printer. Looks like a current control circuit. Does anybody have a datasheet or at least knows the serial protocol this device uses? Thanks!!!
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1answer
261 views

P10 Outdoor RGB DIP LED Module

As I have to make driver for this matrix module, I have a big problem finding its schematic or datasheet. There are many similar modules on the internet, they are made in China. I'm making driver on ...
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1answer
31 views

Looking for datasheet for Alpha 21264C

Not too long back I did some reading on the Alpha CPU architecture and (probably out of a burst of nostalgic stupidity) procured a couple; there's only an issue - the ones I have are the 21264 ...
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1answer
61 views

e13007f npn transistor datasheet reading for turn on time

I am reading datasheet for e13007. You can get it here: http://www.datasheet-pdf.com/datasheetdownload.php?id=520587 (click on "Download PDF for PC") In "Electrical Characteristics" section under ...
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1answer
57 views

How do I model an LED with SPICE WITHOUT access to a Manufacturer's Datasheet

Looking to create a model of an LED (RL5-WW15030 from Superbrightleds.com): ...
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3answers
558 views

How do integrated circuit design companies create their datasheets?

Especially for something like a microprocessor. I assume the majority of information is "auto-generated" or we'd see a lot more typos and errors. A laughable scenario keeps popping into my head ...
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3answers
84 views

Datasheet hunting -

I'm having difficulty trying to figure out voltage outputs for FPGAs. Let's use the Xilinx XC3S2000 FG900 as an example, and say I'm trying to figure out the voltage for pin T22. I do a search for the ...
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83 views

Pinout/Datasheet of Delta DAC-08N001 backlight inverter

I'm repurposing a old notebook display for another project but I can't find the datasheet for the backlight inverter. It's labeled Delta DAC-08N001 and has a 5-Pin input connector (as opposed to the ...
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1answer
67 views

What does “Maximum Input Current” in a data sheet mean?

For example, in the datasheet of ATS030A0X3-SRPHZ, what does the maximum input current mean? Does it mean... 1) This is how much you are allowed to feed into the voltage translator (presumably using ...
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2answers
62 views

How to understanding min/max input values of Schmitt Trigger from datasheet

I am having some difficultly understanding the values described in this product sheet for the SN74AHCT14 Schmitt Trigger Inverter: http://www.ti.com/lit/ds/symlink/sn74ahct14.pdf Given a Vcc of ...
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2answers
142 views

cirrus/wolfson wm8731 - Connecting Analog Input to Codec

I am currently working on an embedded audio processor project based on the stm32f4discovery board and the wm8731 codec from cirrus/wolfson. I was wondering if anyone here is familiar with the codec ...
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2answers
286 views

What are the “No Connect” terminals on this multiplexer and what purpose do they serve?

I was looking through the datasheet for the ADG506A/ADG507A and on the chip there are these terminal marked as NC and underneath the image it says "NC = NO CONNECT". They are also not explained in the ...
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0answers
52 views

What parameters are key in selecting a transformer to pass digital data?

Looking to fiddle around with some digital signaling through transformers. Never done, so this is just to experiment and see what it looks like. For the purpose of digital isolation, what types of ...
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3answers
151 views

Why does the MCP1650 datasheet give such a low value for the inductor in a boost converter?

I'm currently designing an SMPS around an MCP1650. In the datasheet (see page 4), the recommended value of inductor is 3.3uH. However, all the inductor size calculations I've come across (here and ...
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1answer
55 views

Is this calculation for an optocoupler's resistor correct?

I'm trying to calculate what resistor to use for this optocoupler. Per the datasheet, it drops 1.3v at 50mA does this mean I should try choose a resistor that gives me 50mA? My supply is 3.3V so my ...
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0answers
80 views

Use LM324AN as unity gain amplifier

I am trying to read the voltage coming out of a voltage divider with resistors that could go into the mega ohms on the ADC of my micro-controller. The impedance of the divider is too great for the ...
5
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1answer
121 views

Why does the datasheet for this FET show two / three VGS(off) values?

I am using a MMBFJ270 P-Channel JFET and if you look at the characteristic graphs it is saying that there are two values for VGS(off) and in one graph it quotes three different values... Why does it ...
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2answers
35 views

Data sheet of SN74HC164 regarding the output current

On the data sheet of SN74HC164 there are two statements that I apparently don't understand: Cover page says: ±4-mA Output Drive at 5V Page 3 says: Continuous output current Io at Vo between 0 and ...
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3answers
175 views

Op-Amp Datasheet: Open Loop Gain vs Phase

I am attempting to decipher the datasheet for TI's LM6171 op-amp. Here is the open loop frequency response from the datasheet: How can I tell which curve is the gain and which curve is the phase? ...
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1answer
39 views

BZY97C47 zener diode datasheet questions

The BZY97C47 data sheet (I found no direct PDF link) confuses me on several points. I fail to find straight forward information about the maximum allowed forward current from the data sheet. Also, ...
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1answer
56 views

What is the pinout on my K F455P 7An filter?

I have a ceramic filter that I'm using for an AM receiver, but I don't know the pins for it. The lettering on it says K F455P 7An. I know that it's a 455 kHz signal filter and I think that it has a ...