IXYS reserves the right to change limits, test conditions and dimensions © 2010 IXYS All rights reserved
IXYS KOREA LTD. 1 IXYS Corporation
AICT 4F, A Dong.145 Gwanggyo-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, Korea (443-270) 1590 Buckeye Drive, Milpitas, CA 95035-7418
Phone +82-31-888-5232, Fax +82-31-888-5233 Rev. MAR. 2013 Phone (408) 457-9000, Fax 408-496-0670
IXOLARTM High Efficiency SolarBIT.
Description
IXOLARTM SolarBITs are IXYS’ product line of SolarBITs made of monocrystalline, high efficiency solar
cells. The IXOLARTM 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.
IXOLARTM 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)
(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.
Electrical Characteristics
Symbol Cell Parameter Typical
Ratings *
Units
VOC open circuit voltage 1.89 V
JSC short circuit current density (wafer level) 42.4 mA/cm2
Vmpp voltage at max. power point 1.50 V
Jmpp current density at max. power point (wafer level) 37.2 mA/cm2
Pmpp maximum peak power (wafer level) 18.6 mW/cm2
FF fill factor > 65 %
η solar cell efficiency (wafer level) 22 %
ΔVOC/ΔT open circuit voltage temp. coefficient (wafer level) -2.1 mV/K
ΔJSC/ΔT short circuit current temp. coefficient (wafer level) 0.12 mA/(cm²K)
* All values measured at Standard Condition: 1 sun (= 100 mW/cm²), Air Mass 1.5, 25°C
Part Number Open Circuit
Voltage [V]
Short Circuit
Current [mA]
Typ. Voltage
@ Pmpp [V]
Typ. Current
@ Pmpp [mA]
KXOB22-04X3L 1.89 15 1.50 13.38
Features
• Monocrystalline silicon technology
• High efficiency outdoor and indoor
• Long life and stable output
• Sealed Package
• High mechanical robustness
• Surface Mount Package
• Reflow Solderable
Applications
• Battery chargers for portables such as cell
phones, PDAs, GPS-Systems, …
• “Green” electricity generation
• Power backup for UPS, Sensors, Wearables
Advantages
• Automatic Pick & Place Mounting
• One Product for Multiple Applications
• Flexible Integration into the Application
IXYS reserves the right to change limits, test conditions and dimensions © 2010 IXYS All rights reserved
IXYS KOREA LTD. 2 IXYS Corporation
AICT 4F, A Dong.145 Gwanggyo-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, Korea (443-270) 1590 Buckeye Drive, Milpitas, CA 95035-7418
Phone +82-31-888-5232, Fax +82-31-888-5233 Rev. MAR. 2013 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 © 2010 IXYS All rights reserved
IXYS KOREA LTD. 3 IXYS Corporation
AICT 4F, A Dong.145 Gwanggyo-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, Korea (443-270) 1590 Buckeye Drive, Milpitas, CA 95035-7418
Phone +82-31-888-5232, Fax +82-31-888-5233 Rev. MAR. 2013 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 KXOB22-04x3L 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 © 2010 IXYS All rights reserved
IXYS KOREA LTD. 4 IXYS Corporation
AICT 4F, A Dong.145 Gwanggyo-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, Korea (443-270) 1590 Buckeye Drive, Milpitas, CA 95035-7418
Phone +82-31-888-5232, Fax +82-31-888-5233 Rev. MAR. 2013 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 © 2010 IXYS All rights reserved
IXYS KOREA LTD. 5 IXYS Corporation
AICT 4F, A Dong.145 Gwanggyo-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, Korea (443-270) 1590 Buckeye Drive, Milpitas, CA 95035-7418
Phone +82-31-888-5232, Fax +82-31-888-5233 Rev. MAR. 2013 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 © 2010 IXYS All rights reserved
IXYS KOREA LTD. 6 IXYS Corporation
AICT 4F, A Dong.145 Gwanggyo-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, Korea (443-270) 1590 Buckeye Drive, Milpitas, CA 95035-7418
Phone +82-31-888-5232, Fax +82-31-888-5233 Rev. MAR. 2013 Phone (408) 457-9000, Fax 408-496-0670
Relative Lighting Power Density
The f ig ure above compares relative power density for various lighting conditions in units of Watts
per square meter (W/m2). The reference standard condition is 1 Sun and is equal to 1000 Watts
per square meter of sunlight irradiance at a constant 25°C cell temperature and at 1.5 Air Mass
(Air Mass stands for a well defined light spectrum which appears if the sunlight goes through the
earth’s athmosphere at a defined angle).
As the chart clearly shows, the power density of typical indoor lighting is dramatically lower than
that of sunlight. N ot only is irradiance from indirect and artificial light lower; the sp ectrum is also
narrower. In typical Office Space lighting with a spectrum produced from incandescen t or halogen
light bulbs, the power output may be roughly 100 times less than bright sunlight. It may be 200
to 500 times less with fluorescent lighting due to the further limited spectrum.
IXYS makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication and reserv es the
right to make changes to specifications and product descriptions at any time without notice. Neither circuit patent licenses or indemnity are
expressed or implied. Except as set forth in IXYS’ Standard Terms and Conditions of Sale, IXYS assumes no liability whatsoever, and disclaims
any express or implied warranty relating to its products, including, but not limited to, the implied warranty of me rchanta bility, fitness for a particular
purpose, or infringement of any intellectual property right.
The products described in this document are not designed, intended, authorized, or warranted for use as components in systems intended for
surgical implant into the body, or in other applications intended to support or sustain life, or where malfunction of IXYS’ product may result in direct
physical harm, injury, or death to a person or severe property or environmental damage. IXYS reserves the right to discontinue or make changes to
its products at any time without notice.
