Why buy diodes and rectifiers from a local distributor
When a power supply, charger or protection device must work reliably, having the right diode on hand matters. Communica keeps common signal diodes, Schottky types, Zener clamps and bridge rectifiers in local inventory so South African makers, students and engineers avoid long lead times and overseas shipping delays. Local stock means you can collect parts from our Samrand head office or one of our branches, get VAT invoices for procurement, and source matched accessories quickly.
Practical value - not just parts
We focus on delivering usable technical detail at the point of purchase: forward voltage at typical current, reverse leakage, maximum repetitive reverse voltage (VRRM), surge current rating for rectifiers, and power dissipation. That makes it easier to pick a diode that fits your expected thermal envelope and PCB layout without guesswork.
Common diode types and where to use them
Below is a concise comparison to match diode families to common applications. Use it to narrow choices before checking stock.
| Type | Typical use | Key spec callouts |
|---|---|---|
| Signal diode (1N4148) | Logic-level switching, small-signal protection | IF 100 mA, low capacitance, VF ~0.7 V |
| Schottky (SS14) | Low-drop rectification, switching power supplies | Low VF (0.2-0.5 V), higher leakage at high temp |
| Zener (BZX55) | Voltage reference, simple regulators | Vz tolerance, power rating (250 mW-1 W) |
| Bridge rectifier (KBPC) | AC to DC for bench supplies, adapters | VRRM, IF(AV), surge current rating |
Quick selection checklist
- Confirm maximum reverse voltage (VRRM) comfortably exceeds the highest expected reverse stress.
- Match continuous forward current (IF) and account for ambient temperature and PCB copper for thermal relief.
- Check surge and peak current ratings for rectifiers used in inrush or transformer-fed supplies.
- For low-drop applications choose Schottky; for voltage reference pick a Zener with appropriate power dissipation.
Specification callouts to look for on product pages
On every product listing we display VF at a specified IF, maximum reverse current (IR), junction temperature, package type (SMD/through-hole) and datasheet links when available. For a broader browse of part families, see our Collections and the complete index of All Products.
Simple power dissipation check
Estimate diode heating with the formula: Pd = VF × IF. For example, a Schottky with VF 0.35 V at IF 1 A dissipates Pd = 0.35 W. Ensure the diode's rated power and your PCB thermal path keep junction temperature below limits.
