LM79LM63

LM79LM63 is not a standard, widely documented regulator in major manufacturers’ public catalogs. It may be a misprint, a vendor-specific internal code, or a cross-reference error that combines the LM79xx family naming with another part number. If you have encountered this designation in a datasheet or bill of materials, the safest course is to verify with the supplier or obtain the official datasheet for that exact device. If the designation is intended to refer to a member of the LM79xx family, it would denote a three-terminal fixed negative voltage regulator.

The LM79xx family comprises fixed negative regulators used to generate precise negative supply voltages in electronic circuits. Common outputs include -5V, -12V, and -15V, with other voltages available in different variants. These regulators regulate the output voltage by maintaining a constant negative potential relative to ground, provided the input is sufficiently more negative than the desired output. They are typically used in dual-rail power supplies alongside positive regulators (such as LM78xx series) to produce symmetric voltage rails.

Operation and requirements: LM79xx regulators generally require input and output capacitors for stability and transient response. They have a dropout voltage that limits how close the input can be to the target output under load, and their maximum current capability varies by package and variant (commonly around hundreds of milliamps to about 1 amp for standard parts). They can dissipate heat based on the voltage difference between input and output and the load current.

Pinout and packaging: In common TO-220 packages, pins are arranged for three-terminal operation, with the exact order (and the tab connection) varying by model and manufacturer. Always consult the specific datasheet for correct pinout and electrical characteristics.