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L9437 Datasheet(PDF) 1 Page - Hamamatsu Corporation |
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L9437 Datasheet(HTML) 1 Page - Hamamatsu Corporation |
1 / 2 page L9437 is an infrared LED developed for optical encoders. By improving the aspherical lens used with the previous type L8506, we have achieved an even more highly collimated beam of near infrared light. The lead pin of L9437 has no step piece that is usually formed at the lead base brazed to the package, thus eliminating the restriction in printed circuit board design. Features l Collimated light beam l Uniform light spot l Narrow directivity: ±5˚ l High-speed response: 40 MHz Typ. l High reliability Applications l Optical encoder LED Infrared LED LED emitting collimated light for optical encoder L9437 1 s Absolute maximum ratings (Ta=25 °C, unless otherwise noted) Parameter Symbol Condition Value Unit Reverse voltage VR 5 V Forward current IF 80 mA Forward current reduction rate - 0.67 mA/°C Pulse forward current IFP Pulse width=10 µs Duty ratio=1 % 0.5 A P uls e forw ard current reduction ra te - 4.2 mA/°C Power dissipation P 150 mW Operating temperature Topr -30 to +85 °C Storage temperature Tstg -40 to +100 °C s Electrical and optical characteristics (Ta=25 °C) Parameter Symbol Condition Min. Typ. Max. Unit Peak emission wavelength λp IF=30 mA 840 870 900 nm Spectral half width ∆λ IF=30 mA - 45 - nm Optical output *1 Pe IF=30 mA 1.25 1.6 - mW Forward voltage VF IF=30 mA - 1.5 1.65 V Reverse current IR VR=5 V - - 5 µA Light spot size *2 Bw IF=30 mA 4.0 *3 4.3 - mm Cut-off frequency *4 fc IF=30 mA ± 4 mAp-p 25 40 - MHz *1: Measured with a photodiode (active area: φ8 mm) installed 25 mm away from LED stem undersurface. *2: Full width at half maximum of beam spot measured with an image sensor installed 13 mm away from LED stem undersurface. *3: Reference value *4: Frequency at which the optical output drops by -3 dB from that at 100 kHz. |
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