LM3914VX

Display Drivers Overview

The LM3914VX/NOPB is a dot/bar display driver IC manufactured by Texas Instruments, housed in a PLCC-20 surface-mount package. It operates within a supply voltage range of 3 V to 20 V and supports an output current of up to 30 mA. The device features 10 outputs with adjustable voltage characteristics and functions at frequencies of 500 kHz or 1 MHz. Designed for commercial use, it withstands temperatures from 0°C to +70°C. Key internal components include a programmable output current circuit and an internal voltage reference.

Display Drivers Feature Summary

• Integrates a 10-stage precision voltage comparator array with an internal 1.25V reference source for accurate analog level sensing.
• Supports selectable Dot or Bar display modes via external configuration, enabling flexible visual indication formats.
• Features an input buffer capable of accepting signals down to ground potential while providing noise immunity through internal hysteresis.
• Offers open-collector current-mode outputs that interface directly with TTL or CMOS logic levels.

Display Drivers Applications

• Battery capacity monitoring and power level indication
• Audio signal level meters and sound pressure detection
• Linear temperature measurement displays

Display Drivers Procurement Notes

Verify the specific suffix designation, as the LM3914VX/NOPB indicates lead-free packaging compliant with RoHS standards, whereas the base LM3914VX may differ. Confirm component availability status, as listings indicate this part number is often marked as obsolete or discontinued by major distributors. Ensure the required package type matches the PLCC-20 form factor before finalizing procurement plans.

Display Drivers Selection Notes

Select this component when a single-chip solution is required to drive ten LEDs based on an analog input voltage. Consider the PLCC-20 package constraints for PCB layout if surface-mount assembly is mandatory. Evaluate the 30 mA maximum output current against LED requirements to ensure adequate brightness without exceeding thermal limits. Verify compatibility with the system's operating temperature range of 0°C to +70°C.

Display Drivers Part Context

The LM3914 series represents a long-standing line of analog display drivers originally developed by National Semiconductor and now produced by Texas Instruments following their acquisition. This family includes variants like the LM3915 for logarithmic scales and LM3916 for audio applications. The VX suffix specifically denotes the plastic leaded chip carrier package variant, distinguishing it from DIP or SOIC versions within the same functional family.

Display Drivers Replacement Considerations

• LM3914N-1

Display Drivers FAQ

Can multiple LM3914VX devices be cascaded?

Yes, multiple units can be cascaded to drive more than ten LEDs by connecting the input of subsequent stages to the high-level node of the previous stage's resistor divider.

What is the function of the internal hysteresis?

The internal hysteresis circuit eliminates noise interference and prevents LED flickering during rapid changes in the input signal voltage.