The C&D Technologies series of Datel 78SR switching regulators are perfect for cost-sensitive applications where the maximum load current is ½ an amp or less. 7805SR (+5V/0.5A), 7812SR (+12V/0.4A) and 7803SR (+3.3V/0.5A) are high efficiency, easy-to-use, drop-in replacements for power-hungry LM78xx linear regulators. They're 100% pin- and size-compatible with industry-standard, 3-pin TO-220 plastic packages.
Two package styles are available: a standard vertical-mount SIP that occupies less than 0.1 square inch of pc-board real estate, and a horizontal-mount version that allows for an installed height of less than 0.350 inches.
78SR Series' 260KHz switching frequency produces efficiencies as high as 95% for 12V models, and 85% for 3.3V and 5V models. Full-load operation from 9V, 12V, 24V, 28V or 36V supplies-at ambient temperatures as high as +70°C-requires no heat sinks, no forced-air cooling, and no temperature derating, making the 78SR a cost-effective alternative in new and existing LM7805/LM7812 designs. And the high efficiency can dramatically increase battery life in portable instrumentation and standby-power applications and other applications that require full-load operation at elevated supply voltages and/or elevated temperatures.
78SR Series switching regulators offer additional improvements over their linear counterparts, including lower quiescent current (3mA vs. 5 mA), higher operating input voltage (+36V vs. +32V), and significantly tighter output accuracy (±1.5% vs. ±5%). Their excellent line and load regulation of ±0.3% and ±0.2%, respectively, allows operation from poorly regulated dc supplies. And, unlike their linear counterparts, these switchers don't need any external input or output capacitors to provide stable, low-noise outputs.
78SR Series regulators are priced at $9.95 in singles and drop to below $5 in OEM quantities. Small-quantity orders are available from stock. Samples are immediately available from stock.