Why choose Communica for cheap diodes and rectifiers
Find the balance between price, availability and the right electrical characteristics. Communica stocks a broad selection of small-signal diodes, Schottky parts, silicon rectifier bridges and more - with practical selection advice, technical callouts and branch collection to keep your project on schedule. Short lead times from our Samrand head office mean quicker builds for students and faster procurement for technicians.
What you get - beyond low unit cost
Buying lower-cost diodes or rectifiers shouldn’t create rework or downtime. We provide datasheet-backed spec comparisons, suggested accessories (heat sinks, clips, fuses), and VAT invoices for institutional purchases. For branch locations and trading hours, check our branches page here.
Types commonly used in student and maker projects
- Small-signal diodes (1N4148) - switching, logic-level protection
- Schottky diodes (e.g., 1N5819) - low forward drop for power rails
- Rectifier diodes (e.g., 1N400x series) - AC to DC conversion in low-power supplies
- Bridge rectifiers - compact four-diode solution for mains-to-DC conversion
If you want to browse by category or compare parts visually, our collections index is a good starting point here, and our brand index helps when you prefer maker-friendly manufacturers here.
Quick spec callouts to check before you buy
When choosing economy diodes and rectifiers, verify three essentials: maximum reverse voltage (VRRM), average forward current (IF(AV)), and forward voltage drop (VF). For power parts, also check surge current rating and thermal mounting options.
| Type | Typical VRRM | IF(AV) | Use case |
|---|---|---|---|
| 1N4148 (signal) | 100 V | 200 mA | Logic switching, clamping |
| 1N4007 (rectifier) | 1000 V | 1 A | General-purpose AC rectification |
| 1N5819 (Schottky) | 40 V | 1 A | Low-drop power rails |
| KBPC/Bridge | depends on part | 1 A to 50 A | Compact mains rectification |
Specification examples and quick calculations
Estimate diode dissipation to confirm heat handling. Use P = VF x IF. Example: a Schottky with VF = 0.4 V carrying 500 mA dissipates P = 0.4 x 0.5 = 0.2 W - usually fine without a heatsink. For bridge rectifiers, peak inverse voltage must exceed transformer secondary peak: VRRM >= Vsec * sqrt(2). For a 12 VAC secondary: Vpeak = 12 x 1.414 = 17 V, plus margin, so choose a diode rated >25 V.
Simple ASCII wiring for a single-phase bridge to a capacitor filter:
~ AC ~
~ ~
~ ~ ~ ~
| + ---|>|---+ C
| D1 |---- + Vout
| |
| - ---|<|---+ |
| D2 | |
~ ~
