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SMTnet Express, May 15, 2014, Subscribers: 22742, Members: Companies: 13878, Users: 36194

Technical Library

Performance of Light Emitting Diode on Surface Machined Heat Sink

S. Shanmugan, D. Mutharasu, O. Zeng Yin, Universiti Sains Malaysia

In the point of efficient heat removal from light emitting diode (LED) package to ambient, the surface of the heat sinks must be finished based on required condition. The surface finishing plays an important role in efficient heat dissipation. In our work, the top surface of heat sink was machined like two different shapes (slotted and 'W' shaped) and tested the thermal performance for 3W green LED. The total thermal resistance was high for 'W' shaped surface at 100 mA. Surface modification was not influenced much on the thermal resistance (Rth) value at higher operating current. Noticeable increase on junction temperature was observed for 'W' shaped surface at 100 mA than slotted surface. In optical properties, low lux values were recorded for 'W' shaped surface at all operating current. In addition, 'W' shaped surface showed low value in CRI than other two surfaces (plain and slotted). The observed CCT value was decreased as the measuring time increased. High value in CCT was observed for 'W' shaped surface at higher operating current (> 350mA). Slotted surface showed good performance on both thermal and optical properties of the given 3W green LED.

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Forum search results for related keywords: LED, transient, thermal transfer, heat sink.

SMT / PCB Products

The Spectrum™ II
Fluid Dispenser

by: Asymtek

in: Dispensing

EXCEN PRO High Speed
Modular Mounter


in: Pick & Place

Aqueous Cleaning

by: Kyzen

in: Cleaning

MS-15 Series
In-Line AOI Machine

by: Mirtec

in: Inspection

TruView - Fully Modular X-Ray System

by: Creative Electron

in: Inspection

KE-Series Placement Machines

by: Juki

in: Pick & Place

SMT Nozzles
and Consumables

by: Count On Tools

in: Pick & Place

The RTX Series X-ray Inspection...

by: Glenbrook Tech.

in: Inspection

MAX II High Precision Fluid Dispenser

by: GPD Global

in: Dispensing

Mark5 Series -
Reflow System
The Mark III Reflow System

by: Heller

in: Reflow

Pick & Place System

by: Europlacer

in: Pick & Place

Stencil Printer

SP700avi Inline Stencil Printer

by: Speedprint

in: Printing

SMT / PCB Equipment Auctions

Surplus Late Model SMT Production and Process Equipment as late as 2013

May 21 - 12 | by: X-Line Asset Management

Motorola Electronic / Electrical Testing & Physical Measurement Equipment

May 27 - 29 | by: GoIndustry DoveBid

Electronic Equipment Mart

DEK 248 Screen Printer

IBE SMT Equipment

in: Screen Printing Equipment

Siemens Siplace HS-60

AdoptSMT Europe

in: Chipshooters / Chip Mounters

Speedline Electrovert Omni 7E Reflow Oven

CE Exchange

in: Reflow Ovens

Camalot FXD


in: Adhesive Dispensing Equipment

Events Calendar

Northern California Design-2-Part Show

Santa Clara, CA, USA | May 21 | Design-2-Part Shows - The largest design and contract manufacturing show in Northern California...

IPC Apex India 2014

Bangalore, India | May 19 | IPC - Workshops and a technical conference, in addition to exhibits from leading PCB and electronics assembly equipment manufacturers...

Surface Cleanliness Assessment - Online Webinar

Online | May 22 | ZESTRON Corporation - Insight to why it is important to fully clean electronic assemblies...

Career Center


SMT Operator

Rockleigh, NJ, USA | Crestron Electronics

SMT Equipment Technician


SMT Mydata Operator

St. L´┐Żonard, Quebec, Canada | Schneider Electric


SMT Prosess Engineer

Delhi, India

SMT Machine Operator

Mesa, AZ, USA

Manufacturing Engineer /Smt programmer

Sullivan, OH, USA

Industry Associations Events


SMTA - Surface Mount Technology Association is a non-profit international association of companies and individuals (totalling 4,000) involved in all aspects of advanced electronics assembly, surface mount and related technologies.

Membership Info | SMTA Certification | Bookstore

Next Event: Michigan Expo & Tech Forum - May 20


IPC - Association Connecting Electronics Industries is a US-based trade association dedicated to the competitive excellence and financial success of its nearly 2,600 member companies which represent all facets of the electronic interconnection industry, including design, printed wiring board manufacturing and electronics assembly.

Membership Info | Training & Certification Programs | Standards & Publications - Online Store

Next Event: IPC PCB Design Contest - May 19 - 20

Technical Editor - Davef (submit your technical articles)

Newsletter Editor - Anna Girouard, 98 Elm Street, Portland, Maine 04101 USA, Tel.207-780-0887.

Unsubscribe. | Contact customer service

Used PCB Assembly Equipment - CE Exchange

Global Source for Advanced SMT Solder Products - Amtech

PCB Cleaning products - Zestron

Dynamo - Convection SMT Reflow Oven from BTU International

Software for PCB Manufacturing - Unisoft

Motorola Electronic / Electrical Testing & Physical Measurement Equipment Auction

PVA Flexible, Customized Fluid Dispensing Systems

JUKI's machines offer you the Lowest Cost of Ownership in the industry.

Used SMT Equipment - IBE

ii-Feed tape feeding solution for Europlacer machines

Fluid Pressure Control - a breakthrough in uniform fluid dispensing - GPD Global

Mark5 SMT Reflow Oven - Heller

SP700avi inline smt screen printer - Speedprint

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