Murata Power Solutions 78SR Series 2A Synchronous Switching Regulators are step-down, ultra high-efficiency, modern replacements for LM78xx series 1.5A linear regulators. These regulators come in 2 variants 78SR-3.3/2 (3.3V, 2 Amp output) and 78SR-5/2 (5V, 2 Amp output). These regulators are pin and size-compatible, drop-in replacements for TO-220 style, 3-pin SIP or modular packages which require heat sinks. These regulators with a 200KHz switching frequency, combined with a synchronous rectifier buck regulator topology, provides for efficiency exceeding 95%. 78SR switches can easily drive 2A loads from 12V or 24Vsupplies at ambient temperatures up to +70°C without heat sinks, fans, or thermal derating. A thermally efficient 3-pin vertical mount SIP occupies less than 0.09in.2 (58mm2) of pc-board real estate, while a horizontal mount option has an installed height of less than 0.290in. (7.4mm).
78SR Series 2A switching regulators are lower cost, improved-efficiency upgrades for many 78HT2, 78SR1, 78ST1, and PT5100 series switchers. Their higher efficiency ensures significantly lower heat generation and provides increased run time in battery-powered applications, making these regulators ideal for low power “green” applications.