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.
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 |
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.
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.
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.
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.
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.
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.
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.
コンタクトパーソン: Miss. Ava Huang
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