L-7113QBD-D LED: Specifications and Features for South African Designers

Overview: L-7113QBD-D 5mm Blue LED

The L-7113QBD-D is a popular 5mm (T-1 3/4) water clear blue LED, widely used by South African students, hobbyists, and electronics engineers for panel indicators, status displays, custom lighting, and educational kits. Manufactured by brands like Kingbright and available through distributors such as Communica, this LED is recognised for its vibrant blue colour, water-clear lens for maximum brightness, and straightforward circuit integration.

Understanding the key specifications and application tips for the L-7113QBD-D makes it easier to choose, prototype, and troubleshoot your LED projects, whether you're equipping a university electronics lab or retrofitting industrial panels.

L-7113QBD-D: Core Specifications

Typical Applications

• Visual status and power indication
• Logic outputs in student breadboards or microcontroller projects
• Operator panels and test equipment signalling
• DIY and maker lighting effects

South African Context

With no minimum order requirements for most LEDs at Communica, L-7113QBD-D is accessible for both large procurement and quick student projects. Lead times for restocks are typically 1-2 weeks, but check current local availability. Compatible with standard 5mm panel holders and plug into solderless breadboards for rapid prototyping.

Electrical Parameters and Usage Guidance

The most important specifications when designing with the L-7113QBD-D are forward voltage, forward current, and the external resistor required for current limiting.

How to Calculate Series Resistor

For a standard 5V MCU output, the series resistor value R needed for 20mA (0.02A) is calculated via Ohm's Law:

• R = (V_S - V_F)/I_F

Where V_S is supply voltage (V), V_F is typical LED forward voltage (V), and I_F is desired LED current (A). For example:

• V_S = 5V (e.g. Arduino output)
• V_F = 3.2V
• I_F = 0.02A

Thus: R = (5V - 3.2V) / 0.02A = 90Ohm. Choose a standard resistor value (e.g. 91Ohm or 100Ohm) for safety margin.

Wiring Example

+5V ----[ 100Ohm ]----|>|---- GND
                 L-7113QBD-D

Observe correct polarity: the longer lead (anode) connects to +V; the shorter lead (cathode, flat side) to ground.

Troubleshooting Common Issues

• LED won't light: Check polarity and resistor value; confirm output drive from controller.
• Very dim: Series resistor may be too large; check datasheet V_F at your current.
• LED flickers: Possible loose connections or insufficient current drive from GPIO pin.
• LED overheats: Exceeding recommended current; verify forward current and ambient temp.

Frequently Asked Questions (South Africa Focus)

• Are bulk/education packs available? Yes, Communica offers bulk packs with VAT invoices for schools, FETs, and university labs.
• Can I mix with RGB LED displays? These blue LEDs work as single-indicators or combined in arrays; resistor values may differ for multi-colour setups.
• Do these work on 3.3V logic? Possible but expect less brightness at 3.3V; recalculate series resistance as needed.
• Where do I collect in Gauteng? See Communica branches for Samrand, Pretoria CBD, and Cape Town stock options.

Summary

The L-7113QBD-D 5mm blue LED is a dependable, cost-effective choice for diverse South African projects. With strong brightness, low power draw, and broad local availability, it suits a range of applications from rapid engineering prototypes to finished OEM panels.

Sources

• Kingbright L-7113QBD-D Official Datasheet
• L-7113QBD-D Product Listing | Communica
• Communica Branches & Trading Hours (ZA)
• LED Fundamentals and Design Tips