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Documents How to Pick Replacement Electrolytic Capacitors - Workbench Wednesdays 63
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  • Author Author: tariq.ahmad
  • Date Created: 31 Oct 2022 6:13 PM Date Created
  • Last Updated Last Updated: 16 Sep 2024 1:33 PM
  • Views 241637 views
  • Likes 3 likes
  • Comments 7 comments
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How to Pick Replacement Electrolytic Capacitors - Workbench Wednesdays 63

Aluminum (or aluminium) electrolytic capacitors have a chemical layer that has known wear-out mechanisms. Eventually, they need to be replaced. To make matters worse (or better?) there are many different options! Learn why aluminum electrolytic capacitors wear-out and how to pick their replacements in this video.

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Supplemental Content:

  • The Learning Circuit 40: Learning About Polymer Capacitors
  • The Learning Circuit 42: Replacing MLCCs with Polymer Capacitors
  • Workbench Wednesday 04: Capacitor Replacement on a Commodore 64 - A Lesson in Through-Hole Soldering
  • Episode 535: Repair a Sega Game Gear - How Hard Can It Be?
  • Bald Engineer's Electrolytic Flow Chart
  • Axial Polymer BAC Adapter
  •  Selecting electrolytic capacitor replacements (for a TRS-80 Model 100) [Full Video]  

Twitch Livestreams

  • TRS 80 Model 100 re-cap: Remove the caps | Part 1
  • Installing the replacement capacitors into the Model 100 | Part 2

Bill of Material:

Product Name Manufacturer Quantity Buy Kit
35ML10MEFC4X7  Aluminium Electrolytic Capacitor, ML Series, 10 - F, - 20%, 35 V, 4 mm, Radial Leaded RUBYCON  4 Buy Now
50YXJ3R3M5X11 Aluminium Electrolytic Capacitor, YXJ Series, 3.3 - F, - 20%, 50 V, 5 mm, Radial RUBYCON 1 Buy Now
860020772004 Aluminium Electrolytic Capacitor, WCAP-ATG5 Series, 0.47 F, 20%, 63 V, 5 mm, Radial Leaded WURTH ELEKTRONIK 1 Buy Now
860130374004 CAP, 220UF, 16V, ALU ELEC, RADIAL WURTH ELEKTRONIK 1 Buy Now
ECA1CAK330X Electrolytic Capacitor, 33 µF, 16 V, ± 20%, Radial Leaded, 2000 hours @ 85°C, Polar PANASONIC 1 Buy Now
MCNP35V476M8X11.5  Electrolytic Capacitor, 47 µF, 35 V, ± 20%, Radial Leaded, 2000 hours @ 85°C, Bi-Polar [Non-Polar] MULTICOMP PRO 3 Buy Now
MCNP100V105M5X11 Electrolytic Capacitor, 1 µF, 100 V, ± 20%, Radial Leaded, 2000 hours @85°C, Bi-Polar [Non-Polar] MULTICOMP PRO  1 Buy Now
16ML100MEFC6.3X7  Electrolytic Capacitor, Miniature, 100 µF, 16 V, ± 20%, Radial Leaded, 5000 hours @ 105°C, Polar RUBYCON  1 Buy Now
MCUMR35V475M4X5  Aluminium Electrolytic Capacitor, MCUMR Series, 4.7 - F, - 20%, 35 V, 4 mm, Radial Leaded MULTICOMP PRO 1 Buy Now
ECE-A1EKS4R7  Electrolytic Capacitor, 4.7 µF, 25 V, ± 20%, PC Pin, 1000 hours @ 85°C, Polar PANASONIC 1 Buy Now
50ML1MEFC4X5  Electrolytic Capacitor, Miniature, 1 µF, 50 V, ± 20%, Radial Leaded, 3000 hours @ 105°C, Polar RUBYCON 1 Buy Now
EEUFR1E471B  Electrolytic Capacitor, 470 µF, 25 V, ± 20%, Radial Leaded, 6000 hours @ 105°C, Polar PANASONIC  1 Buy Now
WXHAP200 - Desoldering tool for Weller WXR3 Weller 1 Buy Now
 

Additional Parts:

TRS-80 Model 100

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Top Comments

  • baldengineer
    baldengineer over 2 years ago +1
    The TRS-80 Model 100 I used as the example device is working great. Well, it is now that I have thoroughly cleaned the old flux off of it. I completely cleaned the back but only partially cleaned the top…
  • baldengineer
    baldengineer over 2 years ago +1
    Here's a link to the BAC axial adapter board I created (in KiCad.)
  • baldengineer
    baldengineer over 2 years ago

    Follow this link for the full session of selecting the replacement capacitors.

    It's about 20 minutes of electrolytic fun.

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  • baldengineer
    baldengineer over 2 years ago in reply to iajtywu

    "Vent" will sometimes help indicate how the cap is designed to burst during failure or where it outgases during normal operation. Larger snap-in and screw-terminals sometimes have a dimple with a rubber plug on the top.

    The second one is important when conformal coating the capacitor. The first could help decide how you orient the cap during manufacturing.

    Solid Polymer Electrolytic capacitors do not have a vent (since there is no electrolyte to boil.) So maybe it's to help indicate it is a wet (or hybrid) style that DOES have a vent.

    (All wet / hybrid caps have a mechanically stamped vent that ruptures if the cap over-pressurizes.)

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  • dougw
    dougw over 2 years ago in reply to baldengineer

    No-clean flux can cause a surprising number of problems if it is not cleaned off.

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  • iajtywu
    iajtywu over 2 years ago

    I have always wondered about what specs I could change without encountering big issues. Thanks! I have an old Linksys E3000 router that I use as a repeater and all the caps on it seem to need replacing (no bulging caps, but visible leakage). One capacitor has a gold cover (capXon 470uf 10v, GF 105C) with a P1024 VENT designation on it. Does "VENT" have any significance, or is it just a manufacturer code of some kind?

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  • baldengineer
    baldengineer over 2 years ago

    Here's a link to the BAC axial adapter board I created (in KiCad.)

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  • koudelad
    koudelad over 2 years ago

    Nice video. And thank you for pointing out the filtering issues. Every time I filter for some components I feel that many more parts have been unintentionally left out, because there were no values filled for some of the parameters. (Or switched height vs width etc.)

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  • baldengineer
    baldengineer over 2 years ago

    The TRS-80 Model 100 I used as the example device is working great. Well, it is now that I have thoroughly cleaned the old flux off of it. I completely cleaned the back but only partially cleaned the top. In fact, I only cleaned around the areas where I removed the bad capacitors. Whatever residue remained caused problems with the ROM chip. So, once again, it was the uncleaned no-clean flux causing problems. ;)

    Here are a couple of links to the 2.5-hour streams:

    Stream #1: Removing the Model 100 Capacitors

    Stream #2: Installing the Replacement Capacitors

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