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Thermal Resistance Values for LED Lamps - App Note

From Avago Technologies
 

 
Avago Technologies has changed the metal in the lead frames for T-1, T-13/4, and rectangular LED lamp products from a copper-iron alloy to 5005 mild steel. This change was implemented to keep these LED lamp products an attractive, cost effective solution for front panel indicator, backlighting, and emitter applications. These mild steel lead frames are solder dipped, meeting the solderability requirements of Test Method 2026 per MILSTD- 750. Since the thermal conductivity of mild steel is less than that of copper, the LED junction-to-lead thermal resistance values, R?J-PIN, are higher than the values shown for copper-iron alloy leads. The lead frame for the HLMP-6XXX/-PXXX series subminiature lamps has been redesigned to a cross-link configuration to provide enhanced reliability. This crosslink lead frame has a different thermal resistance than the older standard lead frame design. The copper-iron alloy metal for lead frame has not been changed. The lead frame surface finish was converted from silver plating to 85% Sn/15% Pb solder plate about mid year 1982, meeting the solderability requirements of Test Method 2026 per MIL-STD-750.
Products & Services
LED mounts and lenses are used to mount LEDs and shape or transfer light output. Other components in this area include LED light pipes, headers, interconnects, and assemblies. Search by Specification | Learn more about LED Mounts and Lenses
Light-emitting diodes (LED) are PN junction devices that give off light radiation when biased in the forward direction. LEDs are used in a wide variety of indication applications. Search by Specification | Learn more about Light Emitting Diodes (LED)
LED lamps are light emitting diode arrays with traditional lamp ballasts. Learn more about LED Lamps
Lamps are light sources that emit incoherent light for illumination. There are many different types of products. Examples include fluorescent lamps, halogen lamps, heat lamps, incandescent lamps, LED lamps, projection lamps, spectral lamps, and stage lamps. Specialized and proprietary lamps are also available. Search by Specification | Learn more about Lamps
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