LM3914V/NOPB

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LM3914V/NOPB

IC DRVR DOT/BAR DISPLAY 20PLCC

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規格

Package Bulk
ProductStatus Active
DisplayType LED, LCD, Vacuum Fluorescent (VF)
Configuration Dot/Bar Display
DigitsorCharacters 10 Steps
Current-Supply 6.1 mA
Voltage-Supply 3V ~ 20V
OperatingTemperature 0°C ~ 70°C
MountingType Surface Mount
Package/Case 20-LCC (J-Lead)

概述

Description

LM3914V/NOPB is a 10-channel LED display driver with internal 10-step voltage ladder and10 current-sink outputs. It converts an analog input into a visual 0–10 level display. In dot mode, only the active LED lights; in bar mode, all LEDs up to that level light. The LED current is set with a single resistor (ISET) on the IREF/REF pin, typically 1–30 mA per LED. The MODE pin selects dot or bar operation. It operates from a single supply (roughly 3–25 V) and maintains a constant LED current despite supply variations. LEDs are tied to a positive supply and the LM3914 sinks current through its outputs. The input range is scaled by an internal ladder (full-scale around the top of the ladder, adjustable via reference). Applications include VU/audio meters, battery/level indicators, and general LED bar/dot displays. NOPB indicates Pb-free (No Lead) packaging; LM3914V/NOPB is the Pb-free variant of the LM3914 in the specified package (e.g., DIP-18 or SO-18).

Features

Key features of LM3914V/NOPB (10-LED driver):
- 10 current-sinking LED outputs for a bargraph/dot display (no MCU needed).
- External resistor (Rset) to set LED current for all outputs (typically ~1–30 mA per LED).
- Bar/dot mode selectable (one pin controls whether multiple LEDs light or only the active one).
- Internal reference and 10 equal thresholds for linear level indication (compatible with an external reference for higher accuracy).
- Analog input range suitable for full-scale at the reference (0 to about 1.25 V typical).
- Wide supply voltage range: roughly 3 V to 25 V.
- LEDs connected to V+ (anodes) and outputs sink current to ground.
- Outputs are matched and temperature compensated for consistent brightness.
- RoHS-compliant variant (NOPB) available.
- Simple, low-cost solution for LED level indicators; 18-pin DIP/SOIC package.

Package

LM3914V/NOPB uses the VSSOP-18 package (Very Small Outline Package), RoHS-compliant (No Pb).

Pinout

18-pin package (DIP-18/SO-18). It is a 10-channel LED display driver with current-sink outputs. Key functions:
- Ten outputs (O1–O10) that sink LED current toward ground to drive a bar or dot LED display.
- Input signal (SIG) to be compared against an internal reference ladder.
- Reference network (REF OUT and REF ADJ) to set the LED current via an external resistor.
- MODE input to select dot or bar mode.
- Power supply (V+) and Ground (GND) pins.
- LEDs are connected from V+ to each output; the LM3914 sinks current through the active outputs.
In short: LM3914V/NOPB is an 18-pin LED driver that provides 10 current-sinking outputs, with a mode select and an external resistor to set LED current, driven by a single input signal.

Manufacturer

Texas Instruments (TI). TI is an American multinational semiconductor company that designs and manufactures analog, mixed-signal, and other integrated circuits and semiconductor products.

Application

LM3914V/NOPB is a 10-segment LED display driver (dot or bar mode) that accepts a DC analog input and drives up to 10 LEDs. Applications include:
- Audio level meters (VU meters)
- Battery/voltage indicators
- Panel/instrument level displays
- Sensor readouts and general LED bar/dot indicators for DC/low-frequency signals

Equivalent

Equivalents are other members of the LM391x LED display-driver family. Primary substitutes: LM3914, LM3915, and LM3916 (bar/dot modes). The LM3914V/NOPB is simply the lead‑free variant. Other vendors may list cross‑references as LM3914N/NOPB. For exact substitution, check pinout, reference, and current-setting differences in the datasheets, as mode/input-range can vary.

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