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Aluminum electrolytic or ceramic capacitors for linear regulator input and output?

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Aluminum electrolytic or ceramic capacitors for linear regulator input and output?

Replacing tantalum capacitor with ceramic capacitor for Op AmpsCeramic or electrolytic capacitors for a switching buck regulator?Linear regulator LM1084 5.0V capacitors choicePurpose of a resistor at the input of a linear regulatorDamaging a linear regulator applying a voltage to the outputfrequency response — for linear regulatorHow critical are the input and out capacitor values in a linear voltage regulator?Choosing capacitors for a linear voltage regulatorSelecting the correct input/output capacitors for a 7805What causes a faulty Linear Voltage regulator to output wrong voltageInput and Output Capacitor for PoE + DCDC Controller

1

$begingroup$

I am using this linear voltage regulator. The datasheet indicates the input and output values for the capacitance to use, 1uF and 10uF respectively.

Should these capacitors be or a particular type, or does it not matter?

capacitor linear-regulator

share|improve this question

asked 1 hour ago

A.S.A.S.

436214

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  $begingroup$
  This answer is related: electronics.stackexchange.com/a/426181/202270
  $endgroup$
  – Edgar Brown
  48 mins ago
  

  
  
  
  

add a comment | 

1

$begingroup$

I am using this linear voltage regulator. The datasheet indicates the input and output values for the capacitance to use, 1uF and 10uF respectively.

Should these capacitors be or a particular type, or does it not matter?

capacitor linear-regulator

share|improve this question

asked 1 hour ago

A.S.A.S.

436214

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  This answer is related: electronics.stackexchange.com/a/426181/202270
  $endgroup$
  – Edgar Brown
  48 mins ago
  

  
  
  
  

add a comment | 

$begingroup$

I am using this linear voltage regulator. The datasheet indicates the input and output values for the capacitance to use, 1uF and 10uF respectively.

Should these capacitors be or a particular type, or does it not matter?

capacitor linear-regulator

share|improve this question

asked 1 hour ago

A.S.A.S.

436214

$endgroup$

share|improve this question

asked 1 hour ago

A.S.A.S.

436214

share|improve this question

asked 1 hour ago

A.S.A.S.

436214

asked 1 hour ago

A.S.A.S.

436214

asked 1 hour ago

A.S.A.S.

436214

2 Answers
2

active

oldest

votes

3

$begingroup$

It doesn't usually matter, but be aware that some linear regulators--the popular LM2940 series, for example--may be unstable if the output capacitor's ESR is too high or too low. As the datasheet for your regulator doesn't seem to say anything about that at a glance, it should be fine with any capacitors you pick, but see the edit below for a warning.

Non-polarized capacitors more than about a microfarad used to be rare and expensive, which is probably why the datasheet shows polarized capacitors being used. Today, you can get 10μF ceramic capacitors for less than $0.30 each.

---

Edit: As @ThePhoton points out, this regulator may be so old that multi-microfarad ceramic capacitors, with their inherent low ESR, may have been a far-off pipe dream to the engineers writing the datasheet. So this may still be unstable with too low an ESR on its output, so unless you want to test its stability under different operating conditions with the ceramic caps, it may be best to stick to aluminum electrolytics. After all, that's probably what the IC's designers had in mind.

share|improve this answer

edited 15 mins ago

answered 1 hour ago

HearthHearth

4,5151136

$endgroup$

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  $begingroup$
  The chip might just be so old that when they wrote the datasheet, they didn't consider the possibility that someone would want to use a low-ESR ceramic capacitor for such high values (1 and 10 uF). I'd stick with electrolytic unless I had time to experiment and make sure it stays stable with ceramic over all operating conditions (temperature, input voltage, etc).
  $endgroup$
  – The Photon
  53 mins ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  That's a good point, @ThePhoton. Then again, MLCCs are relatively high ESR as ceramics go, and you can get pretty low ESR electrolytics--I'm not sure how they compare, but you do make a good point and I'll add a note to that effect in the answer.
  $endgroup$
  – Hearth
  23 mins ago
  

  
  
  
  

add a comment | 

0

$begingroup$

The datasheet application circuit example schematic shows a 1 microfarad polarized capacitor on the input and a 10 microfarad polarized capacitor on the output. Since the values are in the 1 plus microfarad range and the capacitors are shown as polarized, I would guess that the manufacturer (ST) wants you to use electrolytic caps. I guess you could use a tantalum caps, but unless the datasheet specifies tantalum, that would be a needless expense.

The polarized caps shown on the datasheet circuit lead me to believe that electrolytic caps are what are intended. Very few ceramic caps are over 1 microfarad and very few are polarized.

share|improve this answer

answered 1 hour ago

user193589user193589

388

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Actually, ceramic capacitors of up to hundreds of μF are, while not common, certainly readily available. They're not terribly expensive, either. Ceramic capacitor technology has improved dramatically in the past decade or so.
  $endgroup$
  – Hearth
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  I agree with Hearth that you're wrong to say 1 uF and up are rare as ceramics. But I'd still advise OP to stick with electrolytics since older regulator designs depend on a reasonably high ESR in the capacitor to maintain stability. If the datasheet doesn't promise the regulator is stable with low-ESR or ceramic output capacitors, it's not wise to assume it will be.
  $endgroup$
  – The Photon
  49 mins ago
  

  
  
  
  

add a comment | 

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3

$begingroup$

It doesn't usually matter, but be aware that some linear regulators--the popular LM2940 series, for example--may be unstable if the output capacitor's ESR is too high or too low. As the datasheet for your regulator doesn't seem to say anything about that at a glance, it should be fine with any capacitors you pick, but see the edit below for a warning.

Non-polarized capacitors more than about a microfarad used to be rare and expensive, which is probably why the datasheet shows polarized capacitors being used. Today, you can get 10μF ceramic capacitors for less than $0.30 each.

---

Edit: As @ThePhoton points out, this regulator may be so old that multi-microfarad ceramic capacitors, with their inherent low ESR, may have been a far-off pipe dream to the engineers writing the datasheet. So this may still be unstable with too low an ESR on its output, so unless you want to test its stability under different operating conditions with the ceramic caps, it may be best to stick to aluminum electrolytics. After all, that's probably what the IC's designers had in mind.

share|improve this answer

edited 15 mins ago

answered 1 hour ago

HearthHearth

4,5151136

$endgroup$

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  $begingroup$
  The chip might just be so old that when they wrote the datasheet, they didn't consider the possibility that someone would want to use a low-ESR ceramic capacitor for such high values (1 and 10 uF). I'd stick with electrolytic unless I had time to experiment and make sure it stays stable with ceramic over all operating conditions (temperature, input voltage, etc).
  $endgroup$
  – The Photon
  53 mins ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  That's a good point, @ThePhoton. Then again, MLCCs are relatively high ESR as ceramics go, and you can get pretty low ESR electrolytics--I'm not sure how they compare, but you do make a good point and I'll add a note to that effect in the answer.
  $endgroup$
  – Hearth
  23 mins ago
  

  
  
  
  

add a comment | 

3

$begingroup$

It doesn't usually matter, but be aware that some linear regulators--the popular LM2940 series, for example--may be unstable if the output capacitor's ESR is too high or too low. As the datasheet for your regulator doesn't seem to say anything about that at a glance, it should be fine with any capacitors you pick, but see the edit below for a warning.

Non-polarized capacitors more than about a microfarad used to be rare and expensive, which is probably why the datasheet shows polarized capacitors being used. Today, you can get 10μF ceramic capacitors for less than $0.30 each.

---

Edit: As @ThePhoton points out, this regulator may be so old that multi-microfarad ceramic capacitors, with their inherent low ESR, may have been a far-off pipe dream to the engineers writing the datasheet. So this may still be unstable with too low an ESR on its output, so unless you want to test its stability under different operating conditions with the ceramic caps, it may be best to stick to aluminum electrolytics. After all, that's probably what the IC's designers had in mind.

share|improve this answer

edited 15 mins ago

answered 1 hour ago

HearthHearth

4,5151136

$endgroup$

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  $begingroup$
  The chip might just be so old that when they wrote the datasheet, they didn't consider the possibility that someone would want to use a low-ESR ceramic capacitor for such high values (1 and 10 uF). I'd stick with electrolytic unless I had time to experiment and make sure it stays stable with ceramic over all operating conditions (temperature, input voltage, etc).
  $endgroup$
  – The Photon
  53 mins ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  That's a good point, @ThePhoton. Then again, MLCCs are relatively high ESR as ceramics go, and you can get pretty low ESR electrolytics--I'm not sure how they compare, but you do make a good point and I'll add a note to that effect in the answer.
  $endgroup$
  – Hearth
  23 mins ago
  

  
  
  
  

add a comment | 

$begingroup$

It doesn't usually matter, but be aware that some linear regulators--the popular LM2940 series, for example--may be unstable if the output capacitor's ESR is too high or too low. As the datasheet for your regulator doesn't seem to say anything about that at a glance, it should be fine with any capacitors you pick, but see the edit below for a warning.

Non-polarized capacitors more than about a microfarad used to be rare and expensive, which is probably why the datasheet shows polarized capacitors being used. Today, you can get 10μF ceramic capacitors for less than $0.30 each.

---

Edit: As @ThePhoton points out, this regulator may be so old that multi-microfarad ceramic capacitors, with their inherent low ESR, may have been a far-off pipe dream to the engineers writing the datasheet. So this may still be unstable with too low an ESR on its output, so unless you want to test its stability under different operating conditions with the ceramic caps, it may be best to stick to aluminum electrolytics. After all, that's probably what the IC's designers had in mind.

share|improve this answer

edited 15 mins ago

answered 1 hour ago

HearthHearth

4,5151136

$endgroup$

share|improve this answer

edited 15 mins ago

answered 1 hour ago

HearthHearth

4,5151136

answered 1 hour ago

HearthHearth

4,5151136

answered 1 hour ago

HearthHearth

4,5151136

0

$begingroup$

The datasheet application circuit example schematic shows a 1 microfarad polarized capacitor on the input and a 10 microfarad polarized capacitor on the output. Since the values are in the 1 plus microfarad range and the capacitors are shown as polarized, I would guess that the manufacturer (ST) wants you to use electrolytic caps. I guess you could use a tantalum caps, but unless the datasheet specifies tantalum, that would be a needless expense.

The polarized caps shown on the datasheet circuit lead me to believe that electrolytic caps are what are intended. Very few ceramic caps are over 1 microfarad and very few are polarized.

share|improve this answer

answered 1 hour ago

user193589user193589

388

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Actually, ceramic capacitors of up to hundreds of μF are, while not common, certainly readily available. They're not terribly expensive, either. Ceramic capacitor technology has improved dramatically in the past decade or so.
  $endgroup$
  – Hearth
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  I agree with Hearth that you're wrong to say 1 uF and up are rare as ceramics. But I'd still advise OP to stick with electrolytics since older regulator designs depend on a reasonably high ESR in the capacitor to maintain stability. If the datasheet doesn't promise the regulator is stable with low-ESR or ceramic output capacitors, it's not wise to assume it will be.
  $endgroup$
  – The Photon
  49 mins ago
  

  
  
  
  

add a comment | 

0

$begingroup$

The datasheet application circuit example schematic shows a 1 microfarad polarized capacitor on the input and a 10 microfarad polarized capacitor on the output. Since the values are in the 1 plus microfarad range and the capacitors are shown as polarized, I would guess that the manufacturer (ST) wants you to use electrolytic caps. I guess you could use a tantalum caps, but unless the datasheet specifies tantalum, that would be a needless expense.

The polarized caps shown on the datasheet circuit lead me to believe that electrolytic caps are what are intended. Very few ceramic caps are over 1 microfarad and very few are polarized.

share|improve this answer

answered 1 hour ago

user193589user193589

388

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Actually, ceramic capacitors of up to hundreds of μF are, while not common, certainly readily available. They're not terribly expensive, either. Ceramic capacitor technology has improved dramatically in the past decade or so.
  $endgroup$
  – Hearth
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  I agree with Hearth that you're wrong to say 1 uF and up are rare as ceramics. But I'd still advise OP to stick with electrolytics since older regulator designs depend on a reasonably high ESR in the capacitor to maintain stability. If the datasheet doesn't promise the regulator is stable with low-ESR or ceramic output capacitors, it's not wise to assume it will be.
  $endgroup$
  – The Photon
  49 mins ago
  

  
  
  
  

add a comment | 

$begingroup$

The datasheet application circuit example schematic shows a 1 microfarad polarized capacitor on the input and a 10 microfarad polarized capacitor on the output. Since the values are in the 1 plus microfarad range and the capacitors are shown as polarized, I would guess that the manufacturer (ST) wants you to use electrolytic caps. I guess you could use a tantalum caps, but unless the datasheet specifies tantalum, that would be a needless expense.

The polarized caps shown on the datasheet circuit lead me to believe that electrolytic caps are what are intended. Very few ceramic caps are over 1 microfarad and very few are polarized.

share|improve this answer

answered 1 hour ago

user193589user193589

388

$endgroup$

share|improve this answer

answered 1 hour ago

user193589user193589

388

answered 1 hour ago

user193589user193589

388

answered 1 hour ago

user193589user193589

388