Questions tagged [tantalum]
The tantalum tag has no usage guidance.
1
vote
1answer
80 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 ...
2
votes
2answers
150 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
vote
2answers
237 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 ...
0
votes
2answers
365 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 ...
0
votes
2answers
169 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-...
2
votes
2answers
168 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 ...
3
votes
1answer
400 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 ...
0
votes
1answer
83 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 ...
0
votes
0answers
116 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}\$
\$...
4
votes
1answer
417 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 ...
0
votes
1answer
143 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
1answer
544 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
vote
2answers
733 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 ...
0
votes
2answers
381 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 ...
3
votes
1answer
2k 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 ...
1
vote
2answers
399 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
1answer
136 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 ...
11
votes
4answers
6k 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 ...
4
votes
1answer
1k 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 ...
0
votes
1answer
269 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 ...
4
votes
2answers
305 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 ...
1
vote
0answers
216 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 ...
89
votes
6answers
28k 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 ...
5
votes
1answer
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 ...
9
votes
4answers
3k 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 ?
8
votes
2answers
5k 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 ...
20
votes
3answers
15k 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 ...
3
votes
1answer
3k 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:
...
2
votes
3answers
668 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 ...
