Through-Hole Indicator LED Selection: 3mm/5mm Engineering Essentials

In short: through-hole indicator LED selection starts with viewing angle (30° focused / 60° standard / 120° diffused), then lead customization, lead-plating solder-heat resistance, and wide-temperature validation. For industrial control applications, the requirements must specify validation over -40°C to +85°C and solder-joint reliability.

3mm/5mm through-hole LED: engineering essentials

• Viewing angle: 60° is standard; choose 30° focused or 120° diffused for indicator panels;
• Leads: long lead is the anode; custom lead forms (flat, stepped) can be tooled on request;
• Solder-heat resistance: lead plating determines lumen decay after wave soldering; 100% AOI bond inspection on pure-gold-wire LEDs is the baseline;
• Environment: industrial-control scenarios require wide-temperature (-40°C to +85°C) validation.

※ Hongcheng Optoelectronics supports custom through-hole indicator LED specifications and sample-based prototyping; industrial-grade indicator LEDs are one of our flagship categories.