LEDs - Circuit Board Indicators, Arrays, Light Bars, Bar Graphs

Part Number	Description / PDF	Quantity
WP937AD/EGW Kingbright	REDGREEN RIGHT ANGLE LED INDICAT	298
WP1384AD/ID Kingbright	LED RA 3.4MM 627NM HE RED DIFF	1315
AM2520EF/4SGD Kingbright	SUPER BRIGHT GREEN SOLID STATE L	0
KB-A100SRW Kingbright	LIGHT BAR 660NM RED 8.89X3.81MM	0
DC10CGKWA Kingbright	LED BAR GRAPH 10SEG 570NM GRN	1757
AA3528AVU/ACGSK Kingbright	LED 3MM 1-LEVEL GRN SMD	0
WP73JB/SGDA Kingbright	4.8MM GREEN PCB LED	47
WP934CB/ID Kingbright	LED IND 3MM RA 627NM RED DIFF	4148
WP914CK/4IDT Kingbright	LED IND 2X3MM QUAD RA RED DIFF	8450
KB2700YW Kingbright	LED LIGHT BAR 8.89X3.81MM YLW	9
WP934AD/ID Kingbright	RED RIGHT ANGLE LED INDICATOR	1129
WP4060VH/GID Kingbright	GREENRED BI-LEVEL CIRCUIT BOARD	1212
KB2550SGD Kingbright	LED LIGHT BAR 19.05X3.81MM GREEN	2397
WP1503CB/ID Kingbright	5MM RA.RED LED	3287
WP934FG/2GD Kingbright	LED 3MM BI-LEVEL 565NM GRN DIFF	0
DE4YD Kingbright	LIGHT BAR 590NM YELLOW 15X15MM	0
WP73EK/GDA Kingbright	GREEN RIGHT ANGLE LED INDICATOR	82
WP934CB/YD Kingbright	LED IND 3MM RA 590NM YLW DIFF	3770
KB2655EW Kingbright	LED LIGHT BAR 8.89X8.89MM RED	4217
WP934MD/2ID Kingbright	LED 3MM BI-LEVEL 627NM HER DIFF	0

LEDs - Circuit Board Indicators, Arrays, Light Bars, Bar Graphs

1. Overview

Light Emitting Diodes (LEDs) are semiconductor devices that convert electrical energy into light through electroluminescence. This product category includes indicators, arrays, light bars, and bar graphs designed for circuit board integration. LEDs serve critical roles in modern electronics for status indication, data visualization, and illumination. Their advantages include low power consumption, long lifespan, and compact form factors.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
Indicators	Single/dual-color point-source lighting for status indication	Power switches, network routers, medical device panels
Arrays	Matrix configurations for alphanumeric/symbol display	Seven-segment displays, dot matrix modules
Light Bars	Linear arrangements for directional lighting/brightness zones	Audio level meters, industrial control panels
Bar Graphs	Segmented columns for quantitative visual representation	Battery level indicators, sensor data visualization

3. Structure and Components

Typical LED components include:

Die: Gallium Nitride (GaN) or Indium Gallium Aluminum Phosphide (InGaAlP) semiconductor chips
Substrate: FR4 or metal-core PCB for thermal management
Encapsulation: Epoxy resin with diffused/optical lens structures
Driver Circuitry: Current-limiting resistors or PWM control ICs

4. Key Technical Specifications

Parameter	Description	Importance
Luminous Intensity	0.1-100 cd/m range	Determines visibility in various lighting conditions
Wavelength	400-700 nm (visible spectrum)	Defines color output accuracy
Forward Current	2-30 mA typical	Impacts brightness and longevity
Viewing Angle	5-120 depending on lens design	Dictates light distribution pattern
MTBF	50,000-100,000 hours	System reliability prediction

5. Application Fields

Key industries include:

Consumer Electronics: Smartphones, laptops, home appliances
Industrial Automation: PLC status indicators, HMI panels
Automotive: Dashboard lighting, warning indicators
Medical Equipment: Diagnostic status visualization

6. Leading Manufacturers and Products

Manufacturer	Product Series	Key Features
Cree	XLamp XR	High-brightness automotive indicators
OSRAM	LED Line	Programmable RGB light bars
Nichia	NSPWR70CSS	Ultra-compact bar graph displays
Everlight	DLW-5xxx	Waterproof array modules

7. Selection Recommendations

Key considerations:

Environmental Conditions: Temperature (-40 to +85 C operational range)
Optical Requirements: Color consistency (CIE 1931 standard)
Electrical Compatibility: Driver circuit matching
Form Factor: 0402-5050 package size constraints
Cost Optimization: Trade-off between performance and budget

Industry Trend Analysis

Current trends show:

Micronization: Development of 0201 package formats
Smart Integration: Embedded ICs for addressable lighting
Energy Efficiency: Sub-1mA operational current devices
Automotive Growth: HUD and LiDAR indicator applications
Medical Advancements: UV/IR spectrum specialized indicators