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Did ever bought this phototransistor from Alexan and search for the datasheet on the internet? Chances are you would have a hard time finding the manufacturer website and even the datasheet for this transistor. The WPT-440F phototransistor is an OEM phototransistor sourced by Alexan from a third party.  These are the specifications of the WPT-440F Phototransistor that we have gathered from the Zilog Website http://www.zilog.com/docs/z8encore/appnotes/an0183.pdf

Alexan WPT440F IR Photo Transistor

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Littelfuse, Inc. (NASDAQ/NGS:LFUS) ), (NASDAQ/NGS:LFUS) introduced the 458 Series of 1206-size surface mount fuses. The newest member of the Littelfuse Nano2® fuse product family, the 458 Series is a fast-acting fuse line for overcurrent protection at the PCB level. The 458 Series uses “Wire in Air” construction, a technology that makes possible a smaller fuse without sacrificing I2t, temperature range and operating voltage range.

The fuse’s high surge-withstand capability means fewer open fuses during momentary overloads, and reduced OEM warranty costs for board replacements. Its small size and favorable temperature specs make the 458 Series an ideal solution for today’s smaller electronics designs, especially in the growing markets for notebook PCs and battery packs, where the 1206 fuse is smaller than the nano-size fuses commonly used.

Other suggested applications are in the DC input side of electronic systems such as LCD backlight inverters, DC/DC power modules, car navigation systems, network equipment, telecom equipment, electronic signage and portable consumer electronics.

Smaller Size without Sacrificing Performance
When designers are looking for smaller overcurrent protection devices for these applications, their choices are to use a smaller size chip fuse or a thin film fuse. Because the 458 Series fuse is of a “Wire in Air” design, with ceramic body and gold plated brass caps, it provides better surge withstand characteristics than regular 1206-size chip fuses, and it has less temperature derating than comparable thin film fuses.

The 458 Series fuses are available in ratings from 1 to 10A, with overload opening characteristic of 5 seconds max at 250 percent of ampere rating and high inrush current withstand capability. They have an Interrupting Rating of 50A at 63VDC. The 458 Series fuses are lead-free and fully RoHS compliant, environmentally friendly products, and are recognized under the components program of UL.

As a market leader in fuse technology, Littelfuse offers OEMs production capacity for high volume demand, and fast production ramp-up for short lead times. Coupling high quality and a global delivery network, Littelfuse provides leading circuit protection technologies and industry leading application support.

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KEMET has introduced military-grade ceramic stacked capacitors for use in high-frequency power supplies. The product is commonly referred to as Switch Mode Power Supply Stacked Capacitors, or SMPS Stacked Capacitors.

The product line is qualified to Military Performance Specification MIL-PRF-49470 and DSCC Drawing 87106.

The SMPS Stacked Capacitors are intended for high-reliability SMPS and pulse energy applications. Their low Equivalent Series Resistance (ESR) and Equivalent Series Inductance (ESL) make them ideally suited for input and output filtering of power supply applications as well as snubber applications.

These capacitors are now available in case codes 3, 4, and 5, X7R dielectric, voltage ratings from 50 VDC up to 500 VDC, and capacitance values up to 47 µF. The chip stack is horizontal and the leadframe attachment is a high-temperature solder. They are also available in unencapsulated (unpotted bare chips) or encapsulated (potted assembly) styles. The encapsulated styles are primarily used for applications where increased mechanical and environmental protection is required, such as in avionics systems. The Military performance specification MIL-PRF-49470 is used to establish a baseline part for high-reliability applications.

With an operating temperature range between -55°C and +125°C, and with capacitance shift limited to ±15 percent over that range, these SMPS Stacked Capacitors are an excellent choice for electrical applications, general purpose applications and high-frequency power supply circuits.