IN-S42ATUW

Summary

every figure cited to the datasheet below

0402 top-view SMD LED in a diffused-lens ('U' lens code), PCB-type moulded package — 1.0 × 0.5 × 0.45 mm^{p.1, p.8}
InGaN white emitter — no dominant wavelength; specified by CIE chromaticity x = 0.295 / y = 0.30 at 20 mA^{p.3, p.7}
Chromaticity binned for white — five CIE bins, R27–R31^p.4
Forward voltage 3.1 V typ (4.0 V max) at the 20 mA test current^p.3
Luminous intensity 600 mcd typ at 20 mA — the brightest member of the series^{p.3, p.7}
Wide 130° viewing angle (2θ_1/2)^p.3
25 mA max continuous forward current; 100 mA peak at 1/10 duty, 0.1 ms pulse; 5 V max reverse voltage; 100 mW max dissipation^p.2
Operating −30 to +80 °C, storage −40 to +85 °C^p.2
Moisture sensitive and ESD sensitive (InGaN) — ships dry-packed in a sealed moisture-barrier anti-static bag^{p.2, p.11}
Supplied on tape and reel, 5000 pcs per reel^p.9

IN-S42ATUW is the white member of Inolux's IN-S42AT series, and the one variant with a diffused lens — the 'U' in the part number is the lens code.^p.8 The die is InGaN,^p.7 and being white there is no dominant wavelength: the colour is specified as CIE chromaticity x = 0.295 / y = 0.30^p.3 and binned across five regions, R27–R31.^p.4

Budget 3.1 V typ (up to 4.0 V max) at the 20 mA test point and it returns 600 mcd — the brightest part in the series.^p.3 The V_F spread makes it a 5 V-rail part in practice: (5 − 3.1) / 0.02 = 95 Ω for the full 20 mA, and a backlight or indicator will usually run well below that. Use a current-limiting resistor — the datasheet asks for one explicitly^p.12 — and keep continuous current at or below 25 mA.^p.2

The diffused lens plus 130° viewing angle^p.3 make it a soft, wide-angle source rather than a spot. Reverse voltage is rated to only 5 V,^p.2 and InGaN chips are static-sensitive devices — ESD precautions apply in design and assembly.^p.2