LM3914 Dot Bar Display Driver IC DIP-18

LM3914 Dot Bar Display Driver IC DIP-18 is a versatile analog display driver that can drive 10 LEDs, LCDs, or vacuum fluorescent displays in a dot or bar mode based on an analog voltage input. It is commonly used for battery level indicators, voltmeter displays, and signal strength meters.

Key Features:

• Linear Analog Display Driver: Converts analog input voltage into a visual LED bar or dot display.
• Dot/Bar Mode Selection: Selectable display style to suit power-saving or visual preference needs.
• LED Current Regulation: On-chip programmable current eliminates need for external resistors.
• Expandable: Multiple ICs can be cascaded for longer LED chains.
• Low Power Operation: Suitable for battery-powered applications.

Technical Specifications:

• Operating Voltage: 3V to 25V
• Input Voltage Range: 0V to 1.2V (adjustable with external resistors)
• LED Drive Current: Programmable from 1mA to 30mA
• Display Modes: Bar Mode or Dot Mode (selectable via pin)
• Reference Voltage Output: 1.2V (adjustable)
• Current Regulation Accuracy: ±2%

Mechanical Specifications:

• Package Type: DIP-18 (Dual Inline Package)
• Number of Pins: 18
• Mounting: Through-hole
• Operating Temperature: 0°C to +70°C

Dimensions:

• Body Length: ~23.3mm
• Body Width: ~6.4mm
• Pin Pitch: 2.54mm
• Overall Height: ~4.5mm (excluding pins)

Pinout and Wiring:

• Pin 1 (LED1) to Pin 10 (LED10): Connect to LEDs in sequence
• Pin 2 (V-): Ground
• Pin 3 (V+): Supply voltage (3V–25V)
• Pin 5 (Signal In): Analog input signal
• Pin 9 (Mode Select): Open for bar mode, connect to V+ for dot mode
• Pin 7 & 8: Reference voltage and current set with resistor

Datasheet Reference:

• Search online for “LM3914 datasheet Texas Instruments PDF”

Applications:

• Battery Level Indicator: Visual representation of battery status
• VU Meter: LED sound level display for audio systems
• Voltage Monitoring: Easy-to-read analog voltage status
• Sensor Level Indicator: Display sensor output visually
• DIY Projects: Widely used in hobby and educational electronics

Equivalent Models:

• LM3915: Similar IC with logarithmic scale for audio signals
• LM3916: Optimized for audio level displays with dB scale
• KA3914: Compatible replacement by Fairchild/ON Semiconductor

Package Includes:

• 1 x LM3914 Dot Bar Display Driver IC DIP-18