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

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1answer
34 views

MOSFET power dissipation calculations - Diodes Inc. datasheets

Looking at Diodes Inc. datasheets, I am having trouble following their power dissipation limit calculations for their MOSFETS. E.g. for DMG4496SSS http://www.diodes.com/_files/datasheets/ds32048.pdf ...
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0answers
29 views

how to read correct value from characteristics

How I should use this kind of characteristics in order to read correct value from left chart. Let for example actual Rs/Ro value is 0.2, and temperature is 20 C, humidity 40%. Chart on left side is ...
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2answers
66 views

MOSFET Heat dissipation question

I'm designing an RGB LED strip driver, and for the MOSFETS for the PWM power switching I'm looking at using the PSMN022-30PL. It has a voltage limit of 30v, and can supply up to 30amps, which is more ...
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1answer
44 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 ...
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0answers
19 views

Can I connect many SX1272 (LoRa) based devices to a gateway?

Simple question: Is SX1272 chip by Semtech capable of sending data to LoRa gateways? I'm a little bit confused about LoRa and LoRaWAN. What is the difference?
3
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2answers
67 views

Bridge rectifier - min. required protective resistor

Looking at the datasheet for a MYS80 bridge rectifier, at the bottom it states Min. required protective resistor is 8 ohm. I could not find much information about a protective resistor in regard to ...
6
votes
4answers
895 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 referenced a ...
1
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1answer
87 views

Why are properties of components often given at 1 kHz?

The title pretty much sums it up. Aside from DC, why are the properties of components often listed at 1 kHz? I keep hearing that it is a "standard", but why 1 kHz? This seems to be pretty common in ...
1
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1answer
65 views

SX1272 - LoRa - What is the minimal schematic (needed capacitors/resistors) to use that device?

I'm interested in SX1272 by Semtech. It's a LoRa modem. I'm not the best at reading datasheets. Maybe it's because of my poor English. I wonder what is the minimum schematic of such a chip? What ...
0
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1answer
35 views

Information regarding old AB (Allen bradley) potentiometer JAIN056S102MA

i was looking for information (datasheet) regarding this old potentiometer from 1962 on the internet, JAIN056S102MA type J, 1k-ohm from Allen Bradley and i was not able to find any information about ...
0
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1answer
31 views

NJM2072D Application Questions for Audio Detection Circuit

I am building an audio switch with channel priorities. I will use this in car events where we communicate car-to-car on FRS radios. A few of us also use 2 meter amateur radios for longer range ...
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2answers
155 views

In a circuit with the TI TPS61165, how was D2 chosen?

Looking at datasheet for the TPS61165, I don't see how they chose D2 - it looks like it will only work if the voltage supply is above 12v due to this diode, but the chip's input range is 3-18v. I ...
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6answers
294 views

Reading dimension in datasheet

This is my first time making pcb layout. I am also quite unfamiliar with datasheets. I am using DS90LV019 (the figure is attached below). What is the actual length of this IC. Does ...
1
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1answer
51 views

Where are details regarding peripheral configuration for STM32 controllers in datasheets?

I have recently begun working more with STM32 processors coming from the more simple Atmel 8bit variety. The Atmel datasheets are very nicely laid out -- specifically speaking to how they provide ...
2
votes
2answers
146 views

What is LED spatial distribution?

I was going through a 5mm blue LED data sheet and found this diagram in it. Couldn't figure out what it is.
1
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1answer
35 views

Currents confusion in a JFET datasheet

I am analyzing a JFET. The datasheet has both information about the currents Igss and the maximum of Ig. I know that the Igss is a the reverse current in the PN junction but I can't explain myself ...
0
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1answer
40 views

Input Impedance Question

As I look at the Datasheet of a differential amplifier for input impedance, i see below statement. 0.8||2 for Differential. 0.4||2 for Common mode. What does GΩ||pF mean?
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1answer
45 views

Hashtag Beside Pins names [duplicate]

What does Hashtag (#) means when it's added beside some pins names in datasheets..like WE# in the flash memeory pinout or RI# in RS232 FTDI datasheets??
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1answer
75 views

Voltage follower with a RF signal

I have a RF signal up to 50 MHz coming from a VCO which I want to use on a different impedance circuit. Without any adaptation the signal go down quickly when i raise the frequency because my load is ...
2
votes
1answer
93 views

Need help understanding how to calculate the R value for LD1117

I am really trying to understand how to use adjustable voltage regulators such as the LD1117 sold by sparkfun. I had a look at the datasheet they provide in the product page but it points me to a ...
1
vote
1answer
233 views

SRU-12VDC-SD-C vs SRD-12VDC-SL-C

I'm following this guide [1] to made a Z-Wave compatible doorbell and it requires a SRU-12VDC-SD-C relay. I know nothing really of electronics and have found a SRD-12VDC-SL-C relay on Amazon [2] ...
6
votes
1answer
179 views

Multiple diodes, or single Zener diode?

In the datasheet for the MAX15500, it says I need to use several diodes in series: ... to ensure a voltage difference of 2V to 3.5V from AVDD to AVDDO and from AVSS to AVSSO. Is seems to be ...
2
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1answer
104 views

part identification

If possible. I would like a datasheet for the large IC pictured here, I havent found anything on google yet, seaching:MXICZ101061
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2answers
70 views

What performance requirements are implied by the term “telecom applications”? [closed]

I've noticed the term telecom applications or just telecom in a few datasheets I've come across, and in the book I'm working through, the phrase "In high-speed dc-dc switchers for the telecom market ...
0
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2answers
91 views

How much current can this 74HC245 handle on each output pin?

How much current can this 74HC245 handle on each output pin? Is it 20mA, 35mA, or 70mA? I don't understand what the difference between output current, output clamping current, and supply current is. ...
0
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1answer
40 views

What is thermal resistance of SMD7530 LED

What is thermal resistance of SMD7530 similar to this photo (Or typical LED in this type): With this datasheet: Datasheet for SMD7530 I cannot find any thermal resistance in it's datasheet.
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2answers
84 views

What does it mean when “Adoption of MBIT processes” is listed as a feature of a component?

What is the "MBIT processes" and what does it mean when it's a feature of a transistor like below?
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2answers
89 views

Have bypass cap recommendations already taken derating into consideration?

Datasheets often specify specific values for bypass caps. My assumption is that these values reflect the actual value (after derating), however, I often see on evaluation boards the same nominal value ...
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0answers
51 views

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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2answers
61 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 ...
3
votes
2answers
60 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 ...
0
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1answer
69 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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0answers
125 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 - ...
2
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3answers
83 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 ...
2
votes
5answers
171 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 ...
0
votes
1answer
77 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
219 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
90 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: ...
0
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1answer
213 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
55 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 ...
0
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1answer
41 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: ...
5
votes
2answers
435 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
128 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 ...
0
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2answers
103 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
234 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 ...
3
votes
4answers
801 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 ...
3
votes
1answer
117 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
157 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
944 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 ...