LED Library Part Design

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Here’s what this project is and how it fits together.
Project purpose
  • This project defines a reusable library part and PCB footprint for the ROHM 0603 red LED SML-D13VWT86C. It is intended to be dropped into other schematics/PCBs as a standard indicator LED.
What’s in the design
  • Schematic: Two pin terminals representing the LED’s electrodes:
    • A (anode)
    • K (cathode)
    • No nets are defined yet (expected for a library part template).
  • PCB footprint: A single footprint with two pads named A and K, matching the 0603 LED land pattern (pads present; no board stackup defined in this part project).
Summary of the current contents

Table

ItemRoleNotes
SML-D13VWT86CTarget component0603 red chip LED by ROHM; this project provides symbol/footprint to use it.
ASchematic terminal / padAnode pin representation.
KSchematic terminal / padCathode pin representation.
Design, implementation, and functionality
  • Schematic symbol: Minimal, with A and K terminals that the host design connects to a driver and a series resistor. This keeps the part general-purpose.
  • Footprint: Two SMD pads labeled A/K for a 1608/0603 package. Polarity is conveyed by pad naming (the silkscreen/courtyard/assembly details can be added or adjusted to match your fab conventions).
  • Function in a host design: The LED illuminates when forward-biased through a current-limiting Resistor. Typical usage is MCU GPIO + resistor -> A; K -> ground (or the inverse if sinking current).
Key technologies, dependencies, and design choices
  • Commodity SMD LED (0603): Small footprint trades higher visibility for compactness; brightness is generally lower than larger packages (e.g., 1206) at the same current.
  • Separation of concerns: This library part intentionally omits a resistor or driver so it can be reused across many designs and supply voltages.
  • Polarity clarity: Naming pads A/K reduces assembly errors. Adding a cathode mark in silkscreen/assembly later is recommended for production.
  • Sourcing: The project metadata shows multiple distributors and an active lifecycle in several listings, which is helpful for procurement planning.
Trade-offs and optimizations
  • Size vs brightness: 0603 is compact and easy to place; if maximum visibility is needed, a larger package (1206) provides more luminous output headroom.
  • Current vs lifetime/thermal: Running indicator LEDs below their maximum continuous current reduces heat and improves lifetime and color stability.
  • Source vs sink drive: Many MCUs sink more current than they source; sinking K to the MCU and pulling A to the rail through a resistor can simplify drive and reduce voltage headroom issues.
Practical design rules and considerations (for use in host circuits)
  • Always use a series current-limiting Resistor sized to the actual supply and the LED’s forward voltage; follow the LED datasheet for forward current limits and recommended operating current.
  • For resistors, keep power at or below 60% of rating for reliability (e.g., derating guideline from best practices).
  • Consider lowering LED current in always-on indicators to manage power and extend lifetime while keeping visibility acceptable.
  • Polarity and orientation: Ensure the PCB silkscreen or assembly layer marks the cathode side consistently with K.
  • ESD care: LEDs are ESD sensitive; ensure your assembly/handling procedures are appropriate. For exposed front-panel LEDs or long wiring, consider a small TVS Diode near the entry point.
Potential challenges and performance considerations
  • Assembly polarity errors: Without clear silkscreen/assembly markers, it’s easy to flip A/K in pick-and-place. The A/K pad names help, but visual marks are safer.
  • Visual variability: Color and intensity binning can vary by lot. If UI consistency is critical, lock bins or qualify alternates.
  • Thermal limits: Small packages have limited thermal mass; sustained high current may cause color shift or reduced lifetime. De-rate current as needed.
  • Drive method: Ensure the driver (MCU pin, transistor, or LED driver) can meet the sink/source current and voltage headroom with margins.
Real-world applications
  • Status indicators on compact digital/MCU boards
  • Front-panel UI, activity LEDs, and signal presence indicators
  • Backlighting for icons or small light pipes
Areas for improvement and future enhancements
  • Metadata: Add datasheet-derived properties (forward voltage, recommended continuous current, dominant wavelength, luminous intensity) to the part’s properties for easy reference in host projects.
  • Footprint details: Add a clear cathode silkscreen dot/marker and assembly/paste layers per the datasheet land pattern.
  • 3D model: Include a 3D body to improve assembly visualization and clearance checks.
  • Variants: Publish color/size variants (e.g., 1206 red, green/amber/blue versions) with pin naming aligned to this part for drop-in swaps.
  • Design template: Provide a companion symbol+resistor “indicator LED” module that includes the Resistor and predefined net labels to speed up re-use.
If you want, I can help augment this library part (add polarity marks, datasheet properties, or publish color/size variants) or set up a ready-to-use indicator LED module for your projects.
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A
K
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SML-D13VWT86C

SML-D13VWT86C
Description

Created
Last updated by adrian95
2 Contributor(s)
jharwinbarrozo
adrian95

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Properties

Manufacturer Name
ROHM(罗姆)
Designator Prefix
LED
Manufacturer Part Number
SML-D13VWT86C
Package or Case Code
LED0603_RED

Availability & Pricing

DPNStockQty 1
16K$0.10236
114$0.1823
11.9K$0.34
513–5.5K$0.1103–$6.0583

Assets