From a battery charger that turns from red to green, to a factory control panel that never misses a beat, the humble LED through hole package remains one of the most trusted light sources in electronics. While surface-mount parts dominate high-speed assembly, the 3mm light emitting diode still wins wherever visibility, mechanical strength and easy soldering matter most. In this article we explore real-world application scenarios of a very special performer — the bi-color red & green F3 lamp from a leading LED manufacturer in China.
Spotlight Model: Bi-Color 3mm Through Hole LED (Red & Green)
The spotlight model of this article is the Bi Color 3mm Through Hole LED, a multifunctional 20mA F3 DIP lamp produced by Dongguan Lanjin Optoelectronics Co., Ltd. (东莞市蓝晋光电有限公司). This compact 3mm light emitting diode integrates two chips — red at 620-625nm and green at 525-530nm — inside a single epoxy package, enabling two-color indication with one component and one PCB footprint. Built with San’an and Epistar chips, 99.99% gold wire bonding and superior ESD protection, it is engineered for 50,000 hours of reliable service.
| Parameter | Specification |
|---|
| Package Size | 3mm (F3 DIP), LED through hole |
| Emitting Colors | Red + Green (bi-color) |
| Wavelength | Red 620-625nm / Green 525-530nm |
| Forward Current / Power | 20mA / 0.06W |
| Forward Voltage | Red 1.8-2.4V / Green 2.8-3.4V |
| Lifespan | 50,000 hours |
| Operating Temperature | -40°C to +85°C |
| Chip / Certification | San’an & Epistar / RoHS, REACH |
| Packing | 1000 pcs/bag, anti-static vacuum |
LED Application Scenarios in Daily Life
1. Battery Chargers & Power Banks
The classic application scenario: red means charging, green means full. A bi-color 3mm light emitting diode gives users an instant, glanceable state readout without any display driver. Its long leads survive repeated plugging and the vibration of daily handling — a job the LED through hole package does best.
2. POS Terminals & Payment Devices
Card readers, cash registers and self-checkout kiosks rely on this 3mm light emitting diode to show power, connection and transaction status. The water-clear, high-brightness optics keep the signal visible even under bright retail lighting, while RoHS compliance satisfies global market entry.
3. Industrial Control & PLC Panels
On factory floors, operators distinguish green = running and red = alarm at a distance. The wide 30° viewing angle and -40°C to +85°C range of this LED through hole lamp make it a dependable choice for machinery cabinets, elevators and power distribution boards.
4. Home Appliances & Consumer Electronics
Air conditioners, water purifiers, rice cookers and smart speakers use the bi-color 3mm light emitting diode as a low-cost, long-life status beacon. Its 50,000-hour lifetime outlasts the appliances themselves, reducing after-sales complaints for manufacturers.
5. Automotive Dashboard & Aftermarket Electronics
From door-lock indicators to battery-management modules in EVs and e-bikes, this through hole LED tolerates the temperature swings and vibration of vehicles. The red/green pair clearly communicates states such as charging, fault and standby.
6. Networking, Telecom & Medical Equipment
Routers, switches, base stations and medical monitors all need unmistakable port and power status. The 3mm light emitting diode fits dense PCBs, offers 5V reverse-voltage protection for logic-level driving, and delivers the clarity that technicians rely on.
Why Choose a Bi-Color LED Through Hole Lamp?
- Two colors, one footprint — halves component count versus two single-color lamps.
- Mechanically robust — through-hole leads anchor firmly to the PCB under shock and vibration.
- Easy to assemble and service — ideal for hand soldering, prototypes and repair.
- Ultra-low power — only 0.06W per lamp at 20mA, friendly to battery-powered designs.
- Customizable — wavelength, brightness and lens options tailored by the factory.
About the Manufacturer
Established in 2005, Dongguan Lanjin Optoelectronics Co., Ltd. is an ISO9001:2015 certified LED factory covering 2,500 square meters with anti-static production workshops. The company specializes in light emitting diodes, SMD LEDs, LED displays and LED PCB assembly, holding 2 national invention patents and 12 utility-model patents, with all products compliant with EU RoHS. Whether you need the bi-color 3mm light emitting diode featured here or any other LED through hole series — round, oval, straw hat, flat top, bullet or rectangle — Lanjin offers customized service with 5-15 days delivery and door-to-door shipping by DHL, UPS or FedEx.
LED lights the world, Lanjin lights your life! Contact our team to request samples or a quotation for your next project.
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