IXOLAR
TM
High Efficiency SolarBIT.
Description
IXOLAR
TM
SolarBITs are IXYS’ product line of SolarBITs made of monocrystalline, high efficiency solar
TM
cells. The IXOLAR
SolarBITs is an ideal for charging various battery powered and handheld consumer
products such as mobile phones, cameras, PDAs, MP3-Players and toys. They are also suitable for
industrial applications such as wireless sensors, portable instrumentation and for charging emergency
backup batteries.
With a cell efficiency of typically 22% measured at a wafer level, SolarBITs give the ability to extend run
time even in "low light" conditions and increase battery life and run time in a small footprint, which can be
easily accommodated in the design of Portable Products. The design allows connecting SolarBITs flexibly in
series and/or parallel to perfectly meet the application’s power requirements.
IXOLAR
TM
products have a very good response over a wide wavelength range and therefore can be used in
both indoor and outdoor applications.
Product and Ordering Information (Package Level)
Part Number
KXOB22-04X3
Open Circuit
Voltage [V]
1.89
Short Circuit
Current [mA]
15
Typ. Voltage
@ P
mpp
[V]
1.50
Typ. Current
@ P
mpp
[mA]
13.38
(parameters given are typical values)
Dimensions (L x W x H): 22 x 7 x 1.8 [mm]
SolarBITs Weight: 0.5 grams
SolarBITs are compliant to the RoHS Norm.
Features
• Monocrystalline silicon technology
• High efficiency outdoor and indoor
Typical
Ratings *
Units
• Long life and stable output
• Sealed Package
V
mA/cm
2
V
mA/cm
2
mW/cm
2
%
%
mV/K
mA/(cm²K)
• High mechanical robustness
• Surface Mount Package
• Reflow Solderable
Electrical Characteristics
Symbol
Cell Parameter
V
OC
J
SC
V
mpp
J
mpp
P
mpp
FF
η
ΔV
OC
/ΔT
ΔJ
SC
/ΔT
open circuit voltage
short circuit current density
(wafer level)
voltage at max. power point
current density at max. power point (wafer level)
1.89
42.4
1.50
37.2
18.6
> 65
22
-2.1
0.12
Applications
• Battery chargers for portables such as cell
phones, PDAs, GPS-Systems, …
• “Green” electricity generation
• Power backup for UPS, Sensors, Wearables
maximum peak power
(wafer level)
fill factor
solar cell efficiency
(wafer level)
open circuit voltage temp. coefficient (wafer level)
short circuit current temp. coefficient (wafer level)
Advantages
• Automatic Pick & Place Mounting
• One Product for Multiple Applications
• Flexible Integration into the Application
* All values measured at Standard Condition: 1 sun (= 100 mW/cm²), Air Mass 1.5, 25°C
IXYS reserves the right to change limits, test conditions and dimensions
IXYS KOREA LTD.
906-5 Iui-dong, Yeongtong-Gu, Suwon, Gyeonggi-Do, Korea
Phone +82-31-888-5232, Fax +82-31-888-5233
© 2011 IXYS All rights reserved
1
Rev. AUG. 2011
IXYS Corporation
1590 Buckeye Drive, Milpitas, CA 95035-7418
Phone (408) 457-9000, Fax 408-496-0670
Typical SolarBIT Performance Data
External Quantum Efficiency
IXYS reserves the right to change limits, test conditions and dimensions
IXYS KOREA LTD.
906-5 Iui-dong, Yeongtong-Gu, Suwon, Gyeonggi-Do, Korea
Phone +82-31-888-5232, Fax +82-31-888-5233
© 2011 IXYS All rights reserved
2
Rev. AUG. 2011
IXYS Corporation
1590 Buckeye Drive, Milpitas, CA 95035-7418
Phone (408) 457-9000, Fax 408-496-0670
Package front-side and back-side view.
SolarBIT Pad Design.
(Dimensions in millimeters)
Front-side View details
Back-side View details
SolarBIT PCB Layout Recommendation:
The PCB layout foot print should be equivalent to the layout of the SolarBIT but on the contact pads on the short end(s) it should be
half a millimeter larger than the SolarBIT. For the KXOB22-04x3 one may use two pads of (6 x 2.5)mm size with 18mm spacing.
Moisture Sensitivity, Reflow Soldering and Washing Information
IXYS has characterized the moisture reflow sensitivity of the SolarBIT using IPC/JEDEC standard J-STD-020. Moisture uptake from
atmospheric humidity occurs by diffusion. During the solder reflow process, in which the component is attached to the PCB, the whole
body of the component is exposed to high process temperatures. The combination of moisture uptake and high reflow soldering
temperatures may lead to moisture induced delamination and cracking of the component. To prevent this, this component must be
handled in accordance with IPC/JEDEC standard J-STD-020 per the labeled moisture sensitivity level (MSL), level 1. IXYS does not
recommend the use of chlorinated solvents.
Upon reflow soldering for surface mounting, we recommend to use low temperature solder paste like lead-free Sn-57Bi-1Ag-β
composite paste. For instance, we recommend the lead-free solder paste LST5710 manufactured by Seoul Alloy Metal Co. Ltd, where
it recommends 220±3°C peak temperatures at the reflow zone above 200°C for about 1 min.
Tube Carrier Packaging
SolarBITs are shipped in 460 mm long clear PVC carrier tubes with antistatic coating. A tube contains 20 SolarBIT devices.
IXYS reserves the right to change limits, test conditions and dimensions
IXYS KOREA LTD.
906-5 Iui-dong, Yeongtong-Gu, Suwon, Gyeonggi-Do, Korea
Phone +82-31-888-5232, Fax +82-31-888-5233
© 2011 IXYS All rights reserved
3
Rev. AUG. 2011
IXYS Corporation
1590 Buckeye Drive, Milpitas, CA 95035-7418
Phone (408) 457-9000, Fax 408-496-0670
Background
Some basic information needs to be covered to better understand what to expect in terms of
the
SolarBITs
performance with regards to solar cell type, lighting conditions in terms of
power density, and general industry standards as they relate to battery charging.
Solar Cell Types
Keep in mind these cost and performance tradeoffs when comparing various solar cell
materials:
Polycrystalline cells are commonly found in outdoor applications and have a spectral
sensitivity range of 500nm to 1100nm. They’re in the medium price range and typically offer
a 13% power conversion efficiency.
Monocrystalline cells, such as the IXYS
SolarMD,
have a spectral sensitivity range from 300
nm (near-ultraviolet) to 1100 nm (near-infrared), which includes visible light (400 to 700 nm).
Due to this wide spectral range, they can be used in both indoor and outdoor applications.
Monocrystalline or single-crystalline material is the most expensive but it does not contain
impurities, and as such the power conversion efficiency does not degrade over operating time.
The power conversion efficiency of commercially available monocrystalline cells ranges from
15 to 22%. The surface of these cells is a homogenous dark blue or dark grey.
Finally, amorphous cells, which work in the spectral range of 300nm to 600nm, are used
predominantly indoors in products such as solar powered calculators since they are not
sensitive to the upper light spectrum and cannot take advantage of natural sunlight. They
offer about 5% power conversion efficiency and are mostly used with ultra low power devices
like clocks and electronic calculators. Amorphous cells, like polycrystalline cells, suffer from
efficiency degradation.
IXYS reserves the right to change limits, test conditions and dimensions
IXYS KOREA LTD.
906-5 Iui-dong, Yeongtong-Gu, Suwon, Gyeonggi-Do, Korea
Phone +82-31-888-5232, Fax +82-31-888-5233
© 2011 IXYS All rights reserved
4
Rev. AUG. 2011
IXYS Corporation
1590 Buckeye Drive, Milpitas, CA 95035-7418
Phone (408) 457-9000, Fax 408-496-0670
SolarBit Description
SolarBITs are monocrystalline, high-efficiency solar cells in a surface mount package. They’re
robust and can be used in harsh environments. SolarBITs have a very high (22%) power
conversion efficiency, which means that 22% of the light energy is converted into electrical
energy. They’re extremely useful in applications requiring solar power generation in a limited
space.
Monocrystalline cells can be used in indoor and outdoor applications because they have a wide
spectral sensitivity, 300 to 1100 nm. However, the output power of a solar cell is proportional
(over a wide range) to the incoming light energy, and irradiance is generally much higher
outdoors. The values in the data sheet are measured at “standard condition” of 1 sun, which is
equal to 1000W per square meter sunlight irradiance at a defined light spectrum (air mass of 1.5)
and 25°C cell temperature.
IXYS reserves the right to change limits, test conditions and dimensions
IXYS KOREA LTD.
906-5 Iui-dong, Yeongtong-Gu, Suwon, Gyeonggi-Do, Korea
Phone +82-31-888-5232, Fax +82-31-888-5233
© 2011 IXYS All rights reserved
5
Rev. AUG. 2011
IXYS Corporation
1590 Buckeye Drive, Milpitas, CA 95035-7418
Phone (408) 457-9000, Fax 408-496-0670
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