8.5 V fixed rail, 1.5 A continuous — what it delivers
The STMicroelectronics L4940D2T85 is a single-output positive fixed LDO regulator delivering 8.5 V at up to 1.5 A. Maximum dropout is 0.9 V at full load, so the input rail needs to stay above 9.4 V to maintain regulation. Ripple rejection is specified at 68 dB at 120 Hz — useful for post-rectifier filtering in analog supplies where line-frequency hum needs attenuation. Protection features include over-temperature, reverse polarity, and short-circuit, making it resilient in automotive or industrial environments.
Housed in a D2PAK (TO-263-3) surface-mount package with two leads and a tab. The exposed tab is the thermal path and is electrically connected to the output.