AB203 LUXEON 3535L Line Application Brief 20160706 ©2016 Lumileds Holding B.V. All rights reserved.

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1. Component

1.1 Description

LUXEON 3535L, LUXEON 3535L Colors, LUXEON 3535L HE and LUXEON 3535LS emitters (Figure 1) consist of a 3535 lead-

frame package with an anode and a cathode. A small notch on the corner of the package marks the cathode side of the

emitter package. The anode and cathode both serve as thermal pads for the emitter, with the majority of the heat being

dissipated through the larger pad, corresponding to the cathode. The LUXEON emitter does not include any transient voltage

suppressor (TVS) chip to protect the emitter against electrostatic discharges (ESD) Appropriate precautions should therefore

be taken when handling this device (see Section 5.5).

1.2 Optical Center

The optical center coincides with the mechanical center of the LUXEON emitter. Optical rayset data for the LUXEON

emitter are available on the Lumileds website at lumileds.com.

1.3 Handling Precautions

The LUXEON emitter is designed to maximize light output and reliability. However, improper handling of the device may

damage the silicone coating and affect the overall performance and reliability. In order to minimize the risk of damage to

the silicone coating during handling, the LUXEON emitter should only be picked up from the side of the package.

1.4 Cleaning

The LUXEON emitter should not be exposed to dust and debris. Excessive dust and debris may cause a drastic decrease

in optical output. In the event that a LUXEON emitter requires cleaning, first try a gentle swabbing using a lint-free swab.

If needed, a lint-free swab and isopropyl alcohol (IPA) can be used to gently remove dirt from the silicone coating. Do not

use other solvents as they may adversely react with the package of the LUXEON emitter. For more information regarding

chemical compatibility, see Section 6.

1.5 Electrical Isolation

The LUXEON emitter has two electrodes, with a nominal spacing of 0.65mm, at the bottom of the package. In addition, the

LUXEON emitter contains two tabs on the side of the package. These tabs are cut-off remnants of the lead-frame and are

electrically connected to the anode and cathode, respectively. So it is important to keep sufficient distance between the

LUXEON emitter package and any other objects or neighboring LUXEON emitters to prevent any accidental shorts.

In order to avoid any electrical shocks and/or damage to the LUXEON emitter, each design needs to comply with the

appropriate standards of safety and isolation distances, known as clearance and creepage distances, respectively (e.g.

IEC60950, clause 2.10.4).

Figure 1. Package rendering of a representative LUXEON emitter.