GM1BW78140A
■ Design Notes
1. This product is not designed to resist electromagnetic and ionized-particle radiation. Moreover, it is not designed
to directly resist excessive moisture, such as dew or condensation; or corrosive (salt) air or corrosive gases,
such as Cl, H2S, NH3, SO2, NOX.
2. Do not allow the circuit design to apply any reverse voltage to the LEDs at any time, operating or not. Do not
bias this part in any manner when it is not operating.
3. Sharp recommends using a constant-current supply to drive this part, as a constant-voltage supply may over-
drive the part due to the lowering of VF as the part’s temperature rises. If current beyond this part’s maximum
rating is allowed to flow through it, it may short-circuit; causing excess heat, smoke, or even fire. An overcurrent
circuit is recommended to avoid this, as well as overvoltage protection. Always follow safety standards and reg-
ulations where this device will be applied.
4. This part can be easily damaged by external stress. Make sure it is not mechanically stressed during or after
assembly. The emitting area is sealed with a silicone resin, which is particularly vulnerable to pressure from pick-
and-place equipment. Excessive pressure applied to the sealing resin can cause the underlying structure of the
part to debond or break entirely. Sharp recommends the use of a plastic collet (Teflon preferred) to protect parts
from excess stress.
5. This product uses a blue LED chip in combination with yellow phosphor to achieve its color. There may be some
color change caused by afterglow of the phosphor when driving this part with pulsed power. Heating and level
of current when in operation may also change the color slightly. Verify this part’s performance before use.
6. This part has exposed metal in bands along the side. See Fig. 15. Avoid touching this area when mounting it to
the substrate, and do not allow other conductive elements from the design to contact it.
Fig. 15 Non-contact Areas
Resin
Metal Plate
GM1BW78140A-19
7. This part has a very high light output. Looking directly at it during full power output can cause injury.
8. Sharp recommends taking proper personal and environmental static control precautions when handling this part.
9. Materials of high thermal conductivity are incorporated in this device to allow generated heat to be effectively
transferred from it to the circuit board. For best reliability, Sharp recommends against locating other sources of
heat near the LED, and to incorporate good thermal design practices and verification to maximize the part’s life.
10. Sharp recommends handling these parts in a clean, non-dusty environment since surface dust may be difficult
to remove and can affect the optical performance of the part.
11. Sharp recommends confirming the part’s performance, reliability, and resistance to any of these conditions, if it
is to be used in any of these environments:
• Direct sunlight, outdoor exposure, dusty conditions
• In water, oil, medical fluids, and organic solvents
• Excessive moisture, such as dew or condensation
• Corrosive (salt) air or corrosive gases, such as Cl, H2S, NH3, SO2, NOX
Sheet No. DG-085021
July 30, 2008
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SHARP [ SHARP ELECTRIONIC COMPONENTS ]
