Questions tagged [tantalum]
The tantalum tag has no usage guidance.
40
questions
1
vote
1
answer
64
views
buck converter : capacitors voltage ratings
I'm currently designing a PCB for a caving robot, where PCB space is rather limited.
One thing taking quite some space are the input and output capacitors of the 12 to 5VV DC-DC converter.
I basically ...
- 2,568
1
vote
1
answer
109
views
I have a height problem (with my switching regulator on a height constrained PCB)
I was planning to use this part (datasheet) (basically MC34063 with thermal shutdown,) but I don´t have enough room above the PCB.
I need to keep the components under 2.2mm.
According to my ...
- 31
0
votes
1
answer
114
views
Tantalum capacitor reverse polarity
I have a datasheet for a part (TPS6735IDR) that shows application circuit examples where polarised capacitors are connected the wrong way around (positive terminal to ground). I thought this would ...
1
vote
1
answer
43
views
Replacing 10uF tantalum capacitors with X7R in ADM2587E circuit
I'm working on some device with isolated RS485 based on ADM2587E transceiver with integrated high frequency isolated DC/DC converter.
This IC is a bit tricky if you need low EMI, because DC/DC ...
- 5,682
21
votes
6
answers
4k
views
Why recommend tantalum over ceramic capacitor for voltage regulator? [duplicate]
The LM1117 voltage regulator datasheet recommends using tantalum capacitors on the input and output. What is the reason for this? What advantage does tantalum have over a ceramic capacitor?
A 10μF ...
- 813
0
votes
1
answer
145
views
Identify polarity of 1970's-era dipped tantalum capacitor
Having found the shorted component, now I need to replace it. I'm familiar with dipped tantalum capacitors with painted stripes along one side but these have a dot or stripe up the middle and my Web ...
- 619
5
votes
4
answers
1k
views
Why use a tantalum instead of a ceramic capacitor?
On page 72 of the AD7124-4 datasheet it says:
Decouple AVDD with a 1 μF tantalum capacitor in parallel with a 0.1 μF capacitor to AVSS on each pin.
Why would this capacitor be specified to be a ...
- 93
2
votes
1
answer
68
views
Is it ok to replace a tantalium decoupling capacitor with ceramic?
I am using the Analog Devices ADXL343 accelerometer (https://www.analog.com/media/en/technical-documentation/data-sheets/ADXL343.pdf) which advises using a 1uF tantalium cap on one power line, and a 0....
- 221
1
vote
0
answers
274
views
Help identifying tantalum capacitor without EIA capacitance markings
I purchased some Samsung PM953 NVMe SSDs from an eBay seller.
Unfortunately one of the SSDs has failed power loss protection capacitors and while functional, operates in a fail-safe mode at severely ...
- 11
2
votes
2
answers
704
views
Help identifying tantalum capacitor marked E105
I am trying to repair a device that was handed to me. It has a broken tantalum capacitor with a missing lead, so it needs replacement. However I'm having trouble identifying its capacitance, voltage ...
2
votes
3
answers
4k
views
Can you replace electrolytic capacitors with tantalum ones?
Due to size constraints on a custom PCB, I have opted out for using the smallest type of electrolytic capacitors (3 mm diameter.) However, capacitors in such a small diameter are almost impossible to ...
- 31
1
vote
1
answer
1k
views
Maximum allowable ripple current and surge current for tantalum capacitor
I use two 10uF, 20VDC tantalum capacitors in parallel as decoupling capacitors just after the battery connector. At the moment the battery is plugged in, one of the capacitors sometimes burns out (not ...
- 25
2
votes
2
answers
685
views
Why is a tantalum capacitor recommended?
I am looking at the datasheet of an accelerometer (ADXL345), and in the power supply decoupling section, it says to use a tantalum capacitor. Why is this recommended?
- 1,970
1
vote
2
answers
719
views
How fast do tantalum capacitors self-heal? [closed]
I am troubleshooting a design that uses a 47 µF 20 V tantalum SMD cap across a 15 Vdc rail.
While the derating guidelines I follow dictate a 50% voltage derating for tantalum caps, the design I'm ...
- 1,084
0
votes
3
answers
2k
views
Identifying an SMD Tantalum Capacitor
I'm having trouble identifying a blown SMD tantalum capacitor. The markings on it are 10 35L which I took to be the capacitance, voltage rating, and tolerance, but looking up that component on the ...
- 230
0
votes
3
answers
670
views
LDO with tantalums and circuit with ceramic bypass capacitors
I'm going to use MIC5205 voltage regulator.
According to the datasheet and many sites and discussions I must use tantalum capacitors for the output. This LDO is unstable with ceramic capacitors (low-...
- 5,177
3
votes
2
answers
930
views
Tantalum capacitor as bypass for digital IC
I am reading the MCP4725 digital-analog converter datasheet and they recomend to use two bypass capacitor at supply voltage:
The power supply at the VDD pin should be clean as possible for a good ...
- 229
4
votes
1
answer
1k
views
Why do tantalum capacitor datasheets only quote endurance at their max temperature? How does it change at room temperature?
I'm on my first large board design, and it's only begun to dawn on me how infuriating capacitors can be to design with.
Exhibit A: I need 100uF for a simple circuit to keep my FPGA on for 1ms after ...
- 795
0
votes
1
answer
148
views
Low or High ESR for LDO for a wireless board?
I'm designing a board powered by a LiPo battery and the AP2114H LDO. At the battery side, I chose to use a 100nF ceramic and a 220uF tantalum. But I do not understand what are the considerations for ...
- 155
0
votes
0
answers
249
views
Tantalum capacitor selection in LT3652 Buck Converter
In this circuit, a buck solar single cell Li-Ion battery charger, I need to select C3 and C4 tantalum capacitors. \$V_{BAT(FLT)}\$ is going to be 4.2 V, hence I selected:
\$C3_{VMAX}=10\text{ V}\$
\$...
- 127
5
votes
1
answer
3k
views
What are the key differences between Tantalum and Tantalum Polymer capacitors?
I've noticed that most component retailers split these types, and am wondering what comparative differences there are between them. I know that "regular" tantalum caps usually use MnO2 as an ...
- 6,637
1
vote
1
answer
409
views
What does "Transient Response Recovery" means in the output specification of a AC-DC power supply?
I'm using a AC-DC power supply to provide 24VDC input to a PCB. A 100uF,35V tantalum is used as one of the filter capacitors for the 24V(same from supply) input of DC-DC regulator on PCB. In some ...
0
votes
1
answer
1k
views
Calculating the leaking current for a tantalum capacitor
I've been looking at these tantalum caps for a coin cell operated BLE device, but I'm a little confused by specified leakage current. The datasheet lists the leakage current at <= 0.003CV uA. ...
- 1,347
1
vote
3
answers
2k
views
Tantalum capacitor burning out
I am using a tantalum capacitor of 10 uF rated at 20V as a decoupling capacitor.
It is placed in parallel with a 5V supply. Now when the circuit is powered, the capacitor burns out.
I replaced the ...
- 121
0
votes
2
answers
1k
views
Producing Voltage Spikes from a bench top power supply
I need to test a tantalum capacitor(check if it gets shorted for a spike higher than the rated voltage) and I'm planning for providing voltage spikes to the input connector from a bench top power ...
4
votes
2
answers
4k
views
MLCC vs Tantalum: For Decoupling, input to regulator and ripple reduction
I require a 3.3uf capacitor in a 30 VDC environment for three different purposes:
decoupling of precision ADC or DAC;
input to a regulator (linear, switching, LDO); and
output of any regulator for ...
- 569
1
vote
2
answers
1k
views
Schematic reading capacitor values
I've got a schematic that i found on the internet. The schematics is for a solar pwm charger
designed around a microcontroller in this case a arduino.
The problem lies in the values for the ...
3
votes
1
answer
321
views
Should I use MLCC or Tantalum capacitors near the board's power input?
My board consists of a microcontroller, some RF modules (i.e. bluetooth, wifi, etc), and a few other gadgets.
It is powered by a 12V barrel adapter. I've read conflicting reports whether it's best ...
- 407
17
votes
4
answers
12k
views
Ceramic (MLCC) versus Tantalum capacitors
From the perspective of an electronics designer, but also taking into account price/cost and social considerations (see Coltan mining and ethics link below), I tend to avoid Tantalum capacitors under ...
- 1,992
4
votes
1
answer
3k
views
Burned Out Tantalum Capacitor Replacements
I have an old computer with a broken Miniscribe 8425SA hard disk. One of the capacitors has burned out, and need some help finding a replacement. Here are my questions:
It appears there are similar ...
- 210
0
votes
1
answer
537
views
Aluminum electrolytic vs. tantalum capacitor for buffering SAR ADC Ref input
I want to use the ADS8317 16-Bit SAR A/D converter and have read through the datasheet. In there, ti recommend using a low ESR 47µF tantalum capacitor to buffer the reference input. Now, my reference ...
- 587
4
votes
2
answers
395
views
MAX682 with electrolytic capacitors
In a new design I would like to use the MAX682. In the datasheet I found this typical operating circuit:
I would like to use it exactly like that except that I'm going to pull /SKIP to GND.
In table ...
user17592
1
vote
0
answers
250
views
Are polymer tantalum capacitors safe for use in new designs?
I want to expand this post to cover polymer tantalum caps. In my application I have an older switching regulator that outputs 24V and needs large output capacitance (220uf), so ceramic or polymer ...
- 187
110
votes
6
answers
41k
views
Are tantalum capacitors safe for use in new designs?
I've heard it suggested that "solid tantalum" capacitors are dangerous and may cause fire, may fail short circuit and are fatally sensitive to even very short over voltage spikes.
Are tantalum ...
- 142k
5
votes
1
answer
1k
views
Are tantalums good for PIC Vcap?
I understand that ceramics are good at ESR but would like to know if tantalum would suffice for my application.
Some 16 bit PICs require a >4.7uf cap (10uf recommended) low ESR cap for their internal ...
- 4,532
9
votes
4
answers
5k
views
What is this: a dual CAP?
I am trying to figure this cap out and locate a new one. It says 107K and 10K on it. Is is polarized ? what is it and where do i find one ?
- 91
8
votes
2
answers
6k
views
Which type of 100nF capacitor is best for 78xx regulator output?
I use 78L12 or similar voltage regulators in a few power supplies. I use them in their basic setup, see the picture:
This diagram is common for all 78xx and 78Lxx regulators. It says that output ...
- 2,852
26
votes
3
answers
19k
views
Why does the LM1117 data sheet specifically specify tantalum capacitors?
I'm planning on using an LM1117 to regulate 5 V to 3.3 V. Looking at (any of the several) data sheets for the LM1117, they recommend 10 µF tantalum capacitors between input and ground ...
- 635
3
votes
1
answer
4k
views
Replacing Tantalum capacitor?
I'm going to make a PIC programmer, so currently I'm acquiring parts that I'll need. And here's the one part that I can't get:
...
- 882
2
votes
3
answers
1k
views
Voltage rating and tantalum capacitors
I was originally considering using a 10 µF 6.3 V 0603 ceramic capacitor for stabilising the onboard voltage regulator on my microcontrollers. However, it may not be capable because of ...
- 31k