LM74500QDDFRQ1

• Reverse Polarity Protection controller, Driving an External MOSFET Rather Than Carrying the Load Current Itself
• Replaces a Series Blocking diode, Removing That diode's Continuous Forward Voltage Drop
• 8-Pin Thin SOT-23 package, 2.9mm Long by 1.6mm Wide and 1.1mm High
• Currently in Production and Active in the manufacturer's Lifecycle Status

The Texas Instruments LM74500QDDFRQ1 is a reverse polarity protection controller supplied in an 8-pin thin SOT-23 package measuring 2.9mm long by 1.6mm wide and 1.1mm high. A controller of this type drives an external MOSFET to block current when the supply is connected backwards, standing in for a series blocking diode. The LM74500QDDFRQ1 is a production part and remains active in the manufacturer's portfolio.

Any equipment fed through a connector a person can plug in backwards, or by a battery that can be installed the wrong way round, needs reverse polarity protection. The traditional answer is a series diode, which then wastes its forward voltage drop continuously for the life of the product; a controller such as the LM74500QDDFRQ1 instead switches an external MOSFET, so the protection path contains only that MOSFET's on-resistance and the loss and the associated heat fall away. It is used at the input of automotive electronic control units and accessories, industrial 24V equipment, battery-powered tools and instruments, and any board wired up through a field terminal block. Typical buyers are automotive and industrial hardware designers guarding a board against installation error.