A108 National Semiconductor LM3914N-1 Dot/Bar Display Driver IC, 10-Segment LED Driver, 18-Pin DIP

The LM3914N-1 is a versatile analog-controlled LED driver that senses analog voltage levels and drives 10 LEDs, providing a linear analog display. It is widely famous for its ability to operate in either Dot mode (single LED lit) or Bar mode (a continuous bar of light), making it the industry standard for visual signal level indicators.

Key Technical Specifications

• Function: Dot/Bar Display Driver

• Output Channels: Drives 10 LEDs, LCDs, or vacuum fluorescents

• Display Mode: User-selectable Dot or Bar graph display

• Supply Voltage: Wide operating range from 3V to 25V

• Input Voltage: Expandable to 100V with external components

• Package Type: 18-Pin PDIP (Plastic Dual In-Line Package)

• LED Current: Programmable from 2mA to 30mA (no resistors required for LEDs)

Applications

• Audio Equipment: VU meters and signal strength indicators.

• Power Monitoring: Battery level indicators (fuel gauges) for portable electronics.

• Industrial Sensing: Visual readouts for temperature, pressure, or liquid levels.

• Hobbyist Projects: DIY light shows and analog-to-visual interfaces.

Key Features

• Linear Response: Internal 10-step precision voltage divider.

• No External Resistors: LED current is regulated internally, simplifying circuit design.

• Chaining Capability: Multiple LM3914s can be cascaded for displays of 20 to 100 segments.

• Versatility: Works with single power supplies and can withstand high voltage on the outputs.

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