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Features
* Reverse mount Chip LED.
* Ultra bright InGaN White Chip LED.
* Package in 8mm tape on 7" diameter reels.
* Compatible with automatic placement equipment.
* Compatible with infrared reflow solder process.
* EIA STD package.
* I.C. compatible.
Package Dimensions
Part No. Lens Emitted Color
LTW-21TS5
Yellow InGaN White
Notes:
1. All dimensions are in millimeters (inches).
2. Tolerance is ± 0.10 mm (.004") unless otherwise noted.
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Absolute Maximum Ratings At Ta=25℃
℃℃
℃
Parameter LTW-21TS5
Unit
Power Dissipation 70 mW
Peak Forward Current
(1/10 Duty Cycle, 0.1ms Pulse Width) 100 mA
DC Forward Current 20 mA
Derating Linear From 25°C 0.25 mA/°C
Reverse Voltage 5 V
Operating Temperature Range -20°C to + 80°C
Storage Temperature Range -55°C to + 105°C
Infrared Soldering Condition 260°C For 10 Seconds
Note: Reverse Voltage can’t be continued operating.
Suggest IR Reflow Condition :
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Electrical Optical Characteristics At Ta=25℃
℃℃
℃
Parameter Symbol Part No.
LTW- Min. Typ. Max. Unit Test Condition
Luminous Intensity IV 21TS5 28 112 mcd IF = 5mA
Note 1, 2, 5
Viewing Angle 2θ1/2 21TS5 70 deg Fig.6
x 0.304
Chromaticity Coordinates y 21TS5 0.301
IF = 5mA
Note 3, 5
Fig.1
Forward Voltage VF 21TS5 2.70 3.15 V IF = 5mA
Reverse Current IR 21TS5 10 µA VR = 5V
Note : 1. Luminous intensity is measured with a light sensor and filter combination that approximates the
CIE eye-response curve.
2. Iv classification code is marked on each packing bag.
3. The chromaticity coordinates (x, y) is derived from the 1931 CIE chromaticity diagram.
4. Caution in ESD:
Static Electricity and surge damages the LED. It is recommend to use a wrist band or anti-electrostatic
glove when handling the LED. All devices, equipment and machinery must be properly grounded.
5. Tester
CAS140B is for the chromaticity coordinates (x, y) and Iv
6. The chromaticity coordinates (x, y) guarantee should be added ± 0.01 tolerance.
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Typical Electrical / Optical Characteristics Curves
(25 Ambient Temperature Unless Otherwise Noted)℃
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Bin Code List
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VF Spec. Table
Forward Voltage
(V) at IF = 5mA
VF Bin Min. Max.
A 2.70 2.85
B 2.85 3.00
C 3.00 3.15
Tolerance on each Forward Voltage bin is +/-0.1 volt
IV Spec. Table
Luminous Intensity (mcd) at IF = 5mA
IV Bin Min. Max.
N 28.0 45.0
P 45.0 71.0
Q 71.0 112.0
Tolerance on each Luminous Intensity bin is +/- 15%.
Hue Spec. Table
Color bin limits at IF = 5mA
Hue Bin CIE 1931Chromaticity coordinates
x 0.274 0.274 0.294 0.294
S1 y 0.226 0.258 0.286 0.254
x 0.274 0.274 0.294 0.294
S2 y 0.258 0.291 0.319 0.286
x 0.294 0.294 0.314 0.314
S3 y 0.254 0.286 0.315 0.282
x 0.294 0.294 0.314 0.314
S4 y 0.286 0.319 0.347 0.315
x 0.314 0.314 0.334 0.334
S5 y 0.282 0.315 0.343 0.311
x 0.314 0.314 0.334 0.334
S6 y 0.315 0.347 0.376 0.343
Tolerance on each Hue (x, y) bin is +/- 0.01.
C. I. E. 1931 Chromaticity Diagram
0.2
0.25
0.3
0.35
0.4
0.25 0.27 0.29 0.31 0.33 0.35
X-coordinate
Y-coordinate
S2
S1
S4
S3
S6
S5
LITE-ON TECHNOLOGY CORPORATION
Prop erty of Lite-On On ly
Cleaning
Do not use unspecified chemical liquid to clean LED they could harm the package.
If clean is necessary, immerse the LED in ethyl alcohol or in isopropyl alcohol at normal temperature
for less one minute.
Suggest Soldering Pad Dimensions
Package Dimensions Of Tape And Reel
Notes:
1. All dimensions are in millimeters (inches).
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Package Dimensions of Reel
Notes:
1. Empty component pockets sealed with top cover tape.
2. 7 inch reel-3000 pieces per reel.
3. Minimum packing quantity is 500 pcs for remainders.
4. The maximum number of consecutive missing lamps is two.
5. In accordance with ANSI/EIA 481-1-A-1994 specifications.
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Notes:
1. There are 3 moisture barrier bags or less in inner carton.
2. There are 21 inner carton or less in a master carton.
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Part No. : LTW-21TS5 Page : 9 of 12
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1. Application
The LEDs described here are intended to be used for ordinary electronic equipment (such as office
equipment, communication equipment and household applications).Consult Liteon’s Sales in advance
for information on applications in which exceptional reliability is required, particularly when the failure
or malfunction of the LEDs may directly jeopardize life or health (such as in aviation, transportation,
traffic control equipment, medical and life support systems and safety devices).
2. Storage
The package is sealed:
The LEDs should be stored at 30°C or less and 90%RH or less. And the LEDs are limited to use within
one year, while the LEDs is packed in moisture-proof package with the desiccants inside.
The package is opened:
The storage ambient for the LEDs should not exceed 30°C temperature or 60% relative humidity.
It is recommended that LEDs out of their original packaging are IR-reflowed within one week.
For extended storage out of their original packaging, it is recommended that the LEDs be stored in a sealed
container with appropriate desiccant, or in a desiccators with nitrogen ambient.
LEDs stored out of their original packaging for more than one week should be baked at about 60 deg C for at least
20 hours before solder assembly.
3. Cleaning
Use alcohol-based cleaning solvents such as isopropyl alcohol to clean the LED if necessary.
4. Soldering
Recommended soldering conditions:
Reflow soldering Soldering iron
Pre-heat
Pre-heat time
Peak temperature
Soldering time
150~200°C
120 sec. Max.
260°C Max.
10 sec. Max.(Max. two times)
Temperature
Soldering time 300°C Max.
3 sec. Max.
(one time only)
Soldering notes:
Because different board designs use different number and types of
devices, solder pastes, reflow ovens,
and circuit boards, no single temperature profile works for all possible combinations.
However, you can successfully mount your packages to the PCB by following the proper
guidelines and
PCB-specific characterization.
LITE-ON Runs both component-level verification using in-house KYRAMX98 reflow chambers and
board-level assembly.
The results of this testing are verified through post-reflow reliability testing.
Profiles used at LITE-
ON are based on JEDEC standards to ensure that all packages can be successfully
and reliably surface mounted.
Figure on page3 shows a sample temperature profile compliant to JEDEC standards.
You can use this example as a generic target to set up your reflow process.
You should adhere to the JEDEC profile limits as well as specifications and
recommendations from the
solder paste manufacturer to avoid damaging the device and create a reliable solder joint.
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Part No. : LTW-21TS5 Page : 10 of 12
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5. Drive Method
An LED is a current-operated device. In order to ensure intensity uniformity on multiple LEDs connected
in parallel in an application, it is recommended that a current limiting resistor be incorporated in the
drive circuit, in series with each LED as shown in Circuit A below.
Circuit model A Circuit model B
LED
LED
(A) Recommended circuit.
(B) The brightness of each LED might appear different due to the differences in the I-V characteristics
of those LEDs.
6. ESD (Electrostatic Discharge)
Static Electricity or power surge will damage the LED.
Suggestions to prevent ESD damage:
Use of a conductive wrist band or anti-electrostatic glove when handling these LEDs.
All devices, equipment, and machinery must be properly grounded.
Work tables, storage racks, etc. should be properly grounded.
Use ion blower to neutralize the static charge which might have built up on surface of the LED’s
plastic lens as a result of friction between LEDs during storage and handling.
ESD-damaged LEDs will exhibit abnormal characteristics such as high reverse leakage current, low forward
voltage, or “ no lightup ” at low currents.
To verify for ESD damage, check for “ lightup ” and Vf of the suspect LEDs at low currents.
The Vf of “ good ” LEDs should be >2.0V@0.1mA for InGaN product and >1.4V@0.1mA for AlInGaP
product.
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7. Reliability Test
Classification
Test Item Test Condition Reference Standard
Operation Life Ta= Under Room Temperature As Per Data Sheet
Maximum Rating
*Test Time= 500HRS (-24HRS,+72HRS)*@20mA.
MIL-STD-750D:1026
MIL-STD-883D:1005
JIS C 7021:B-1
High Temperature
High Humidity
Storage
Ta= 65±5℃,RH= 90～95%
*Test Time= 240HRS±2HRS
MIL-STD-202F:103B
JIS C 7021:B-11
High Temperature
Storage Ta= 105±5℃
*Test Time= 500HRS (-24HRS,+72HRS)
MIL-STD-883D:1008
JIS C 7021:B-10
Endurance
Test
Low Temperature
Storage Ta= -55±5℃
*Test Time=500HRS (-24HRS,+72H RS)
JIS C 7021:B-12
Temperature
Cycling
105℃ ～ 25℃ ～ -55℃ ～ 25℃
30mins 5mins 30mins 5mins
10 Cycles
MIL-STD-202F:107D
MIL-STD-750D:1051
MIL-STD-883D:1010
JIS C 7021:A-4
Thermal
Shock 85 ± 5℃ ～ -40℃ ± 5℃
10mins 10mins 10 Cycles
MIL-STD-202F:107D
MIL-STD-750D:1051
MIL-STD-883D:1011
Solder
Resistance T.sol= 260 ± 5℃
Dwell Time= 10 ± 1secs
MIL-STD-202F:210A
MIL-STD-750D:2031
JIS C 7021:A-1
IR-Reflow
Ramp-up rate(217℃ to Peak) +3℃/ second max
Temp. maintain at 175(±25)℃ 180 seconds max
Temp. maintain above 217℃ 60-150 seconds
Peak temperature range 260℃+0/-5℃
Time within 5°C of actual Peak Temperature (tp)
10-30 seconds
Ramp-down rate +6℃/second max
MIL-STD-750D:2031.2
J-STD-020D
Environmental
Test
Solderability
T.sol= 235 ± 5℃
Immersion time 2±0.5 sec
Immersion rate 25±2.5 mm/sec
Coverage ≧95% of the dipped surface
MIL-STD-202F:208D
MIL-STD-750D:2026
MIL-STD-883D:2003
IEC 68 Part 2-20
JIS C 7021:A-2
8. Others
The appearance and specifications of the product may be modified for improvement without prior notice.
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9. Suggested Checking List
Training and Certification
1. Everyone working in a static-safe area is ESD-certified?
2. Training records kept and re-certification dates monitored?
Static-Safe Workstation & Work Areas
1. Static-safe workstation or work-areas have ESD signs?
2. All surfaces and objects at all static-safe workstation and within 1 ft measure less than 100V?
3. All ionizer activated, positioned towards the units?
4. Each work surface mats grounding is good?
Personnel Grounding
1. Every person (including visitors) handling ESD sensitive (ESDS) items wears wrist strap, heel
strap or conductive shoes with conductive flooring?
2. If conductive footwear used, conductive flooring also present where operator stand or walk?
3. Garments, hairs or anything closer than 1 ft to ESD items measure less than 100V*?
4. Every wrist strap or heel strap/conductive shoes checked daily and result recorded for all DLs?
5. All wrist strap or heel strap checkers calibration up to date?
Note: *50V for Blue LED.
Device Handling
1. Every ESDS items identified by EIA-471 labels on item or packaging?
2. All ESDS items completely inside properly closed static-shielding containers when not at
static-safe workstation?
3. No static charge generators (e.g. plastics) inside shielding containers with ESDS items?
4. All flexible conductive and dissipative package materials inspected before reuse or recycles?
Others
1. Audit result reported to entity ESD control coordinator?
2. Corrective action from previous audits completed?
3. Are audit records complete and on file?
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