This part is a kind of semiconductor called 1N5308.

Function of this product has CURRENT LIMITER FIELD EFFECT DIODES.

Manufacturers : Knox Semiconductor Inc

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Some of the text within the PDF file :

CURRENT LIMITER FIELD EFFECT DIODES 1N5283 - 1N5314 PART NUMBER ♦ 1N5283 ♦ 1N5284 ♦ 1N5285 ♦ 1N5286 ♦ 1N5287 ♦ 1N5288 ♦ 1N5289 ♦ 1N5290 ♦ 1N5291 ♦ 1N5292 ♦ 1N5293 ♦ 1N5294 ♦ 1N5295 ♦ 1N5296 ♦ 1N5297 ♦ 1N5298 ♦ 1N5299 ♦ 1N5300 ♦ 1N5301 ♦ 1N5302 ♦ 1N5303 ♦ 1N5304 ♦ 1N5305 ♦ 1N5306 ♦ 1N5307 ♦ 1N5308 ♦ 1N5309 ♦ 1N5310 ♦ 1N5311 ♦ 1N5312 ♦ 1N5313 ♦ 1N5314 REGULATOR CURRENT Ip (mA) @ Vs = 25V NOM MIN MAX 0.22 0.24 0.27 0.30 0.33 0.39 0.43 0.47 0.56 0.62 0.68 0.75 0.82 0.91 1.00 1.10 1.20 1.30 1.40 1.50 1.60 1.80 2.00 2.20 2.40 2.70 3.00 3.30 3.60 3.90 4.30 4.70 0.198 0.216 0.243 0.270 0.297 0.351 0.387 0.423 0.504 0.558 0.612 0.675 0.738 0.819 0.900 0.990 1.080 1.170 1.260 1.350 1.440 1.620 1.800 1.980 2.160 2.430 2.700 2.970 3.240 3 [ ... ]

1N5308 PDF Datasheet Download