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IN-S42ATR — Red

Inolux Corporation · Top View SMD LED · 0402 (1.0 × 0.5mm) · AlInGaP
0402 Inolux IN-S42AT RoHS Red LED
Wavelength
631nm
645nm peak
Luminous Intensity
90mcd
@ 20mA
Forward Voltage
2.1V
max 2.6V
Forward Current
25mA
20mA typical
Viewing Angle
130°
2θ½
Power Dissipation
78mW
max rated

Electrical Characteristics

Forward Voltage (typ)2.1V @ 20mA
Forward Voltage (max)2.6V @ 20mA
Reverse Voltage (max)5V
Forward Current (max)25mA
Peak Forward Current100mA (1/10, 0.1ms)
Power Dissipation78mW
Dominant Wavelength631nm
Peak Wavelength645nm
Luminous Intensity90 mcd @ 20mA
Viewing Angle (2θ½)130°
MaterialAlInGaP
Lens TypeClear

Operating Conditions

Operating Temp−30°C to +80°C
Storage Temp−40°C to +85°C
ESD SensitivityAlInGaP — handle with care
PolarityCathode marked on package
⚠ ESD Sensitive Device — AlInGaP LEDs require proper ESD precautions during handling and assembly. Use grounded wrist straps and ESD-safe workstations.

Package & Dimensions

Top View K (cathode) A 1.0 ± 0.1 0.5 ± 0.1 Side View 0.45 ± 0.1 0402 (1005 metric) Clear lens · AlInGaP ⚠ Polarized — cathode mark on package indicates negative terminal

Recommended Land Pattern

Pad Width0.4 ± 0.1mm
Pad Height0.6 ± 0.1mm
Pad Gap (edge-to-edge)0.6 ± 0.1mm
PolarityCathode marked on PCB

Emission Color

Red
631nm Dominant Wavelength
Peak wavelength 645nm · AlInGaP semiconductor · CSS approximation: #DC143C

Spectral Distribution

Emission Spectrum — Relative Intensity vs. Wavelength

631nm 0% 25% 50% 75% 100% Relative Intensity 500 540 580 620 660 700 Wavelength (nm)
Red emission centered at 631nm dominant wavelength (645nm peak). The narrow spectral width indicates a well-defined color output typical of AlInGaP LEDs.

Forward Current vs. Forward Voltage

IV Characteristic — the essential curve for circuit design

Typ: 2.1V, 20mA Operating point 2.6V max 25mA max 0 12.5 25 37.5 50 Forward Current (mA) 0.0 1.0 2.0 3.0 4.0 5.0 Forward Voltage (V)
Characteristic exponential IV curve for an AlInGaP red LED. Near-zero current until threshold (~1.8V), then steep rise. Design point: 2.1V typical at 20mA. Never exceed 2.6V forward or 25mA continuous.

Forward Current Derating

Maximum Forward Current vs. Ambient Temperature

30mA @ 25°C 5mA @ 80°C Safe operating 0 7.5 15 22.5 30 Max If (mA) 0 25 50 80 100 Ambient Temperature (°C)
Maximum allowable forward current decreases linearly with temperature. At 80°C ambient, derate to only 5mA. Design margin is critical in enclosed or high-temperature applications.

Luminous Intensity vs. Forward Current

Relative Brightness (normalized at 20mA)

Linear 1.0 @ 20mA 0 0.5 1.0 1.5 2.0 Relative Brightness 0 10 20 30 40 50 Forward Current (mA)
Brightness increases sublinearly with current. Doubling the current from 20mA to 40mA yields only ~70% more light, not 100%. This means diminishing returns at higher drive currents — optimize for efficiency at or below 20mA.

Luminous Intensity vs. Temperature

Relative Brightness vs. Ambient Temperature (normalized at 25°C)

1.0 @ 25°C Brighter when cold Dimmer when hot 0 0.5 1.0 1.5 2.0 Relative Brightness -30 -10 10 25 50 70 Ambient Temperature (°C)
AlInGaP LEDs lose brightness at elevated temperatures. At 70°C, expect ~40% reduction in luminous intensity. Conversely, the LED is ~35% brighter at -30°C. Account for this in designs with wide temperature swings.

LED Resistor Calculator

⚡ Series Resistor Selection

Volts
Milliamps
Calculated Resistor
60.0 Ω
R = (3.3V - 2.1V) / 20mA
Nearest E24 Value
62.0 Ω
Actual If = 19.4mA
Resistor Power
23.2 mW
P = (Vsupply - Vf) × If
LED Power
40.6 mW
P = Vf × If (max 78mW)
3.3V 62.0Ω LED GND 20mA

Environmental & Handling

ESD Sensitivity
AlInGaP — handle with care
Use grounded wrist straps & ESD-safe tools
Operating Temperature
Continuous operation range
−30°C to +80°C
Storage Temperature
Unbiased storage
−40°C to +85°C
Moisture Sensitivity
MSL noted in packaging
Follow J-STD-020 bake requirements

Symbol, Footprint & 3D Model

Schematic Symbol
Footprint (0402)
3D Model — Static & Pick-and-Place (interactive)
Export: KiCad Symbol (.kicad_sym) KiCad Footprint (.kicad_mod) Fusion 360 (.lbr) 3D Model (.step)

Pricing & Availability

Mouser Electronics
—
Check availability
Search on Mouser →
DigiKey
—
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Search on DigiKey →
JLCPCB / LCSC
—
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Documents

DatasheetIN-S42AT Series V1.1 (PDF) →
SeriesIN-S42AT
ManufacturerInolux Corporation

Molecule — Single-Passive Board

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IN-S42ATR characterization · Data from Inolux IN-S42AT Series V1.1 datasheet + adom-parts-search · 2026-06-03