Why buy capacitors from Communica for your projects
When a prototype fails or a production run needs a parts refresh, waiting weeks for overseas delivery costs time and momentum. Communica holds local stock across common capacitor types so South African makers, students and procurement teams get parts now - with VAT invoices, branch collection and accurate lead-time advice. We focus on practical selection, not buzzwords: choose the right dielectric, voltage rating and packaging for reliability in your real-world application.
What you get - practical value over promises
- Immediate access to electrolytic, ceramic MLCC, film, tantalum and supercapacitors.
- Specification guidance for ripple, ESR and temperature performance.
- Local branch pickup from Samrand, Pretoria CBD or Cape Town and account quotes for procurement teams.
Quick overview of capacitor types
Selecting capacitors starts with dielectric choice and expected operating conditions. Use this short table to compare common types before diving into datasheets.
| Type | Strengths | Typical use |
|---|---|---|
| Electrolytic (Aluminum) | High capacitance, inexpensive | Bulk filtering, power rails |
| MLCC (Ceramic) | Low ESR, small size | Decoupling, high-frequency bypass |
| Film | Stable, low loss | Audio, timing, precision circuits |
| Tantalum | Stable capacitance per volume | Space-limited designs, low-voltage rails |
| Supercaps | Very large capacitance | Energy backup, RTC hold-up |
Key specs that matter
When you buy capacitors, check these values on the datasheet: rated voltage, capacitance tolerance, ESR/ESL, temperature range, ripple current, and physical size. For decoupling on microcontrollers, MLCCs of 0.1uF-10uF with low ESL are typical. For bulk smoothing on 12V rails, choose electrolytic capacitors with voltage rating at least 1.5× the operating voltage and adequate ripple current rating.
Simple calculations and examples
Estimate capacitor size for power-rail hold-up using the energy equation: E = 1/2 · C · (V1^2 - V2^2). To find required capacitance for a given hold-up time t and load current I at nominal voltage V: C = I · t / (V - Vmin). Example: to hold 5V for 50ms with a 200mA load and permissible drop to 4.5V: C = 0.2 · 0.05 / (5 - 4.5) = 0.02 / 0.5 = 0.04F (40,000uF), so a supercap or large electrolytic bank is required.
For ripple heating on electrolytics, use P = I_ripple^2 · ESR to estimate dissipation and select a part with adequate ripple-current rating and temperature margin.
Browse component ranges and compare categories on our Collections or scan every stocked SKU in All Products to match exact sizes and footprints.
