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How to Identify Positive and Negative Poles of 5050 RGB LED
Date：
2026-03-24
1. Basic Concepts
- Anode (+): Positive terminal, where current enters the LED.
- Cathode (-): Negative terminal, where current exits the LED.
- Common Anode (CA): All RGB chips share one positive pin; individual R/G/B pins are negative.
- Common Cathode (CC): All RGB chips share one negative pin; individual R/G/B pins are positive.
2. Visual Identification Methods
(1) Package Markings (Most Reliable)
- Chamfer/Notch: A small cut on one corner of the 5050 package → the pin(s) on this side are Cathode (-).
- Markings on PCB/Strip:
V+/+: Common Anode (+).GND/-: Common Cathode (-).R/G/B: Color control pins (negative for CA, positive for CC).
- Internal Electrodes: Larger metal pad = Cathode (-); smaller pad = Anode (+).
(2) Multimeter Test
- Set multimeter to Diode Test mode.
- Touch probes to two pins:
- LED lights up → Red probe = Anode (+), Black probe = Cathode (-).
- No light → Reverse probes and test again.
3. Typical Pinout (6‑Pin 5050 RGB)
表格
| Pin | Common Cathode (CC) | Common Anode (CA) |
|---|---|---|
| 1 | R Anode (+) | R Cathode (-) |
| 2 | G Anode (+) | G Cathode (-) |
| 3 | Common Cathode (-) | Common Anode (+) |
| 4 | B Anode (+) | B Cathode (-) |
| 5 | NC/Optional | NC/Optional |
| 6 | NC/Optional | NC/Optional |
4. Key Notes
- Always confirm CA/CC type before wiring (check datasheet or test with multimeter).
- Add current‑limiting resistors on R/G/B pins to prevent burnou
5050 RGB,5050
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