3.5 x 2.8mm SURFACE MOUNT LED LAMPS # Technical Documentation: KA3528SGC LED
Manufacturer: KINGBRIG
Component Type: Surface-Mount Device (SMD) LED
Document Version: 1.0
Date: October 26, 2023
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## 1. Application Scenarios
The KA3528SGC is a high-brightness, surface-mount LED in the industry-standard 3528 (3.5mm x 2.8mm) package. Its primary characteristics—efficiency, compact size, and reliability—make it suitable for a diverse range of lighting and indication applications.
### Typical Use Cases
* Backlighting Units (BLUs): Employed as the primary light source in edge-lit configurations for LCD displays in consumer electronics, automotive dashboards, and industrial control panels.
* Status and Indicator Lighting: Provides clear, reliable visual status feedback in appliances, networking equipment, power supplies, and instrumentation panels.
* Decorative and Architectural Lighting: Used in light strips, signage, and contour lighting due to its small footprint, enabling high-density arrays for uniform illumination.
* General Purpose Illumination: Integrated into compact luminaires, task lights, and emergency lighting fixtures where moderate, diffuse light output is required.
### Industry Applications
* Consumer Electronics: Smartphones, tablets, televisions, monitors, and gaming peripherals for display backlighting and aesthetic lighting.
* Automotive: Interior ambient lighting, dashboard indicator backlighting, and center console illumination (non-critical, interior applications only).
* Industrial: Status indicators on machinery, Human-Machine Interface (HMI) panels, and control system consoles.
* Telecommunications: Indicator lights on routers, switches, modems, and other network infrastructure hardware.
### Practical Advantages and Limitations
Advantages:
* High Luminous Efficacy: Delivers bright output relative to power consumption, enhancing energy efficiency in designs.
* Compact Form Factor: The 3528 package allows for high-density PCB mounting, enabling sleek and space-constrained product designs.
* Excellent Soldering Reliability: Robust SMD construction withstands standard reflow soldering processes.
* Wide Viewing Angle: Typically offers a broad radiation pattern (e.g., 120°), suitable for applications requiring wide-area illumination.
* Long Operational Life: Solid-state design ensures a typical lifespan exceeding 25,000 hours under recommended operating conditions.
Limitations:
* Thermal Management Dependency: Performance and longevity are directly tied to junction temperature. Inadequate heat sinking or excessive drive current leads to accelerated lumen depreciation and color shift.
* Limited Peak Luminous Flux: While efficient, a single 3528 LED may not suffice for high-lumen output requirements without employing large arrays.
* ESD Sensitivity: Like most LEDs, it is susceptible to Electrostatic Discharge (ESD). Proper handling and circuit protection (e.g., TVS diodes or current-limiting resistors) are mandatory.
* Color Consistency: While binned, slight variations in chromaticity can occur between batches. Critical color-matching applications may require tighter bin selection.
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## 2. Design Considerations
Successful integration of the KA3528SGC requires careful attention to electrical, thermal, and optical design.
### Common Design Pitfalls and Solutions
* Pitfall 1: Overdriving the LED. Applying excessive forward current (`I_F`) beyond the absolute maximum rating.
* Solution: Always implement a constant-current driver or a precise current-limiting resistor. Calculate the resistor value using `R = (V_Source - V_F) / I_F`, where `V_F` is the LED's forward voltage at the target current.
* Pitfall 2: Inadequate Thermal Management. Mounting the LED on a PCB with
