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Questions tagged [integrated-circuit]

An integrated circuit (IC) is an electronic circuit built onto a single plate of a semiconductor material, normally silicon. Modern ICs may contain billions of transistors and they have played a major part in the miniaturization and performance improvements of modern electronic systems.

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Why wont my shift register work (without arduino or pi)

I am trying to build a programable microcontroller. and I am using 8 bit 74hc595 shift registers as ram or memory for it, but they wont recive input, and freeze. the Circut im using is right below.
Elijah Morrow's user avatar
-2 votes
1 answer
78 views

What is this SMD IC "4bwe" Part Number?

It's for a smart Multimeter. Its getting hot when on. The Multimeter is malfunctioning [
spicky 's user avatar
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0 answers
40 views

Why should VS always be larger than VIH? [closed]

Why is VS always larger than VIH? What are possible issues?
Kimberly Perez's user avatar
1 vote
0 answers
39 views

Need help identifying this SMD part please

This is from a VP7-3ATI LCD Controller from Westar. The reference for the part on the board is U31 The best I can tell is the text on the chip says either "B7AK" or "87AK" but I'm ...
SherEEf's user avatar
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6 votes
2 answers
750 views

How to decide sizes for transistors in a design? What does it mean to design an IC?

I have recently started designing analog ICs as part of my academic work. So far all I do is take topologies given in textbooks or papers and try to design them in the PDKs available at my university. ...
Koustubh Jain's user avatar
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0 answers
36 views

How to determine exact output impedance of the source degeneration using feedback analysis?

How can I get the EXACT output impedance when looking from the drain side of the source degeneration using FEEDBACK ANALYSIS? It can be derived easily using a couple of methods, but I'm having some ...
hana's user avatar
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2 votes
1 answer
71 views

Why do many mosfet models exclude Cds ​ in parasitic capacitances?

Why do many models of MOSFET parasitic capacitances not include \$ C_{ds} \$? (the image taken from this site) In integrated circuits, MOS transistors usually have four terminals. If we consider ...
hana's user avatar
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-1 votes
0 answers
41 views

What kind of PLL is typically used for the digital logic in high-frequency ASIC's? [closed]

Want to generate clocks up-to 2GHz from the PLL internal to the ASIC for the critical data-path logic, please advise. Thanks! Looks like there are wide variety of PLL's, dithered, multiphase, Fs, etc. ...
necro's user avatar
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2 votes
1 answer
108 views

Trying to identify this chip and possibly its functionality?

I applied too much voltage to my Smooth Stepper and I'm just trying to learn a little about it and possibly get lucky and fix it. I'm trying to identify the IC in the picture, as I believe this took ...
user781675's user avatar
1 vote
0 answers
53 views

Why does my W65C51's echomode have weird bit delay?

I've recently bought a new Western Design Company 6551 IC, but after hooking it up I get a weird bit-delay while using the Echomode. When I send a character, for example 'U', it should send (startbit)...
Mathijs Klaver's user avatar
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0 answers
80 views

Need Help Increasing PWM Frequency from 800 Hz to 8000+ Hz for DC Motor Speed Control

I'm currently developing a speed control system for a powerful 12V DC motor that pulls a heavy load. To enhance system efficiency, I need to raise the PWM frequency from the 800 Hz (PLC upper limit) ...
Mark's user avatar
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-1 votes
1 answer
108 views

Help on IC identifying

Please help me on identifying the following chip. Smd mark says "5MM 615". Picture: Addetto better picture. It appeaers to me 5MM on the first line with 5M overlined. 615 on the bottom line ...
salvatore cirasa's user avatar
0 votes
1 answer
28 views

What is this IC marked '63M44P .420'?

I have an IC in an SMD package with 6 pins. It is used in switching power supply. It is marked as: First row: 63M44P Second row: ...
Иван Боев's user avatar
0 votes
0 answers
48 views

Help identify what IC is it?

help please identify what IC is it (or even manufacturer) ? (22C3TWB0c e3 and and few triangles logo)
Lion's user avatar
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1 vote
0 answers
36 views

Help Needed for Solar Battery Charger Design Using CN3795

I have created a solar battery charger using the CN3795 IC. The goal is for the panel to output 2A at 5V. The panel characteristics are as follows: 50W, Vmp of 17.22V, and Imp of 2.91A. For the ...
Alexander idid's user avatar
0 votes
0 answers
26 views

Impedance measurement using AD 5933

I hope this message finds you well. I am using the AD 5933 evaluation board for impedance measurement, The data sheet says it can measure the impedance up to 10M ohm. I am currently measuring the ...
Kamran Bashir's user avatar
0 votes
1 answer
64 views

Part name of this IC - "LLA#537"

I want to know the part numbers of the components marked as shown in the attached image.
Bang Duong's user avatar
2 votes
1 answer
100 views

Chip Identification - "+A0V" & "LBSS"

Would anyone know what the +A0V chip that looks like a BJT is. Measuring with a ruler the dimensions are approx. 1.5mm by 1mm. It is connected to this chip that I also don't know what it is, with ...
Cillantro's user avatar
  • 129
2 votes
1 answer
140 views

Chip Identification - TVS diodes

Can someone please confirm that these are bidirectional TVS diodes, I cannot find the datasheets for these anywhere, but they look to be them.
Cillantro's user avatar
  • 129
4 votes
1 answer
184 views

Chip identification, SOP-4, "HPTD"

Anyone know what this chip is? The dimensions are approx 4mm by 2.5mm. Also I believe one of the pins is connected to Vout of a voltage regulator. Could it be a voltage detector?
Cillantro's user avatar
  • 129
1 vote
1 answer
66 views

Identify SOT23-6 smd marking code 169 324

This chip in electronic load DL24M, please help me identify it. pin 4 it's out and connected with pin 1 LM321 (on 4pcs lm321)
izadapter's user avatar
2 votes
2 answers
230 views

Need help implementing a 16x13bit ROM

I'm trying to build a tiny "hex font ROM" analogous to the ones embedded in for example the HP TIL311 and am pretty much unable to find useful parts. Since it's for hexadecimal, I'd need 16 &...
nonchip's user avatar
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1 vote
1 answer
93 views

Why does this two stage op-amp not work?

I was trying to simulate a two stage op-amp I had just learned about. I am going step by step i.e. as you can see from the schematic I have started with ideal current sources. I know that this op-amp ...
Koustubh Jain's user avatar
-1 votes
1 answer
93 views

Chinese clone op amps , not talking about counterfeit / fake op amps [closed]

I already know about Chinese counterfeit / fake op amps, AKA getting a totally different op amp and re-etching the IC or faulty op amps going to china and these op amps getting sold. But what about ...
Michael Weaser's user avatar
0 votes
0 answers
48 views

Switched Capacitor Non-Inverting Amplifier

I have been studying switched-capacitor circuits recently. I have come across one question with regards to the switched-capacitor non-inverting amplifier circuit shown below. It is made up of ...
Kenlucius's user avatar
  • 179
2 votes
4 answers
111 views

Opamp dual package IC configuration

I have a question regarding the configuration of opamps for sensor signal amplification. I have a circuit with two sensors going through identical signal conditioning circuits (amplification and ...
enrico's user avatar
  • 93
1 vote
1 answer
57 views

Understanding the components of backlight circuit of digital watch [closed]

I am not a hardware engineer. I studied basic electronics 15 years back in school days, so you can consider me a noob. I have a digital watch in which all the features (time, alarm, chime, etc) work ...
Naveen's user avatar
  • 119
1 vote
1 answer
176 views

How to identify this IC FG97

I'm trying to identify an IC labeled FG97 1847 17145. It is a 16-pin SMD.
HNLinh's user avatar
  • 173
0 votes
0 answers
77 views

SRAM not writing properly after radiation exposure

I have an SRAM memory device GM76C88AL with this datasheet. The RAM was exposed to a radioactive beta source (~2MeV) for some time (about 2 hours). The source was just right above it (placed on it), ...
ludicrous's user avatar
  • 1,163
2 votes
1 answer
149 views

Z253 and N1 marking on chips - identification

I have two chips that I don't really know what they could be. The chips with the Z253 marking are connected to a connector, micro and some other things; whereas the N1 marked chips are connected to an ...
Cillantro's user avatar
  • 129
0 votes
1 answer
60 views

Decreasing the input offset voltage of two stage opamp to below \$1 \: \text{mV}\$

I'm working on a two-stage opamp constituted by MOSFET transistors. The important specifications for this project are Open loop bandwidth of \$30 \: \text{MHz}\$ Closed loop gain of \$2\$ A standard ...
Carl's user avatar
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0 votes
3 answers
117 views

Is possible for information in a logical circuit to travel in the opposite direction as the current? [closed]

Is possible for information in a logical circuit to travel in the opposite direction as the current? I'm asking about theoretical possibilities, not the current status. For example, if circuits used ...
wepajakeg's user avatar
0 votes
0 answers
108 views

Why does the author assume \$R_{in} = 1/ g_m \$ for this this circuit?

The following circuit is from Chapter 13 of Analog Design Essentials, page 1324, written by Willy Sansen. Calculate \$R_{in}\$ for this circuit. The author thinks \$R_{in} = 1 / g_m\$ However, $$ -...
kile's user avatar
  • 907
0 votes
1 answer
51 views

How is the \$M^2\$ term derived in the PLL output phase noise spectrum?

Originally, I was interested in the derivation of Equation 12.5 in the RF synthesis chapter of Razavi's textbook Design of phase-locked loops. I tried to look up the origin of it and found out a very ...
Tong Su's user avatar
  • 113
2 votes
1 answer
36 views

Implementing triangular ramp in simulation

I am using the UCC256301 in a project (I know it says it is not recommended for new designs). I am trying to simulate my system using PLECS and it needs the controller IC's behaviour implemented. From ...
SM32's user avatar
  • 406
0 votes
2 answers
68 views

Please explain how these two different DAC configurations produce different output voltage ranges

This question is regarding the AD667 DAC. In a previous question I learned that the pin 1 5k resistor does not affect the output voltage range for unipolar mode (assuming I understood the responses ...
charles's user avatar
  • 51
0 votes
2 answers
74 views

Identification for L313 marking, 5 pins

Anyone have any idea what these two chips are? I believe they could be voltage regulators, but I am not too sure as I can't find the documentation anywhere. Both of them are connected to multiple ...
Cillantro's user avatar
  • 129
2 votes
1 answer
91 views

Please explain why datasheet says to connect the feedback resistors in a particular way

The datasheet for the AD667 DAC shows how to connect the output to internal feedback resistors in different ways, in order to get different output voltage ranges. For output range of 0 to +5 V, it ...
charles's user avatar
  • 51
0 votes
2 answers
109 views

Is VSSOP-8 packaging any different from SOP-8?

Are these two packaging titles similar with different names or is there actually a difference? (please provide both sizes in mils if different) The device in question is a INA821
hmg373's user avatar
  • 9
0 votes
4 answers
82 views

IC socket for SMD on Breadboard

I'm trying to find an IC socket that will work on a breadboard for a "SMD" type pins. Breadboard https://www.digikey.com/en/products/detail/dfrobot/FIT0096/7597069 I have a chip fds9934 ...
Still's user avatar
  • 15
0 votes
1 answer
78 views

How do digital watches steadily increment the internally stored time without fluctuations in speed while running other logic at the same time? [closed]

I'm not 100% sure if the right place to ask this is StackOverflow, Software Engineering, or here, but I'm going to guess here since this is related to hardware. I was looking at my digital watch and ...
I Like Python's user avatar
1 vote
2 answers
745 views

Can a 4066 IC work at 3.3V?

I am trying to incorporate a CD4066 in my circuit to switch a 3.3V signal. I am bad at reading datasheets but I think this datasheet says this IC works with 5V-15V between VDD and GND pins of the IC. ...
Iskander's user avatar
0 votes
2 answers
53 views

Can I go below recommended voltage range for a particular IC input pin?

The ISL71840SEH analog mux has an input pin VREF, which the datasheet says the recommended range is 4.5 to 5.5 V: It goes on to say that the logic threshold is about 30% of VREF, so for 5V VREF the ...
charles's user avatar
  • 51
0 votes
1 answer
79 views

ARM based microprocessor IC number, what is the exact model of microprocessor?

It is a ARM based microprocessor with 48 pin count and most probably 32-bit and one more detail which may help is that another single EEPROM IC has been used alongside? What is the tentative model of ...
Meet's user avatar
  • 23
2 votes
1 answer
240 views

Which IC is this marked as ATMLH2392DCM?

What is this IC (please see the image) number is ATMLH2392DCM TH 223900Y?
Meet's user avatar
  • 23
0 votes
1 answer
49 views

What is the IC marked as 858Z TI 31JP7J3 (can see the photo attached)?

Can anyone help me with this ic code written on the smd component
Meet's user avatar
  • 23
0 votes
1 answer
25 views

Need for current protection on low current digipot

Context: I am designing a power control system for a 24v 300w halogen lamp and to do this I am taking a stock buck converter Here with current and voltage control, removing two potentiometers and ...
Shai Morrison's user avatar
0 votes
0 answers
76 views

9V Battery Supply power for Op Amp

I have some questions about some theory and design methods. I am currently trying to power op amp INA333 and multiplexer MUX506IPWR. I have decided to use a 9V battery (I have to use battery), voltage ...
rel's user avatar
  • 11
1 vote
2 answers
144 views

Device is not charging (how to test ic)?

I have this USB-C rechargable vacuum cleaner. But 2 months after I replaced the battery for a bigger one (from 1500 to 3000 mah 18650) it is not charging anymore, it used to charge with the latter ...
Panamanian's user avatar
0 votes
1 answer
36 views

Identification of an IC labeled S3t

A chip found in a Ducati motorcycle dashboard. It had a little water and it got burnt. So the chip used to control all the light indicators no nothing turns on. The small writing on the chip is "...
Ray Ray's user avatar

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