STMicroelectronics LM219N

Overview

LM219N from STMicroelectronics is a high-speed dual voltage comparator in a 14-pin DIP package, operating from +5 V single supply or ±15 V split supplies, with 80 ns typical response time, ±12 V input common-mode range at ±15 V supply, and open-collector outputs capable of sinking 25 mA - used in relay drivers, window detectors, and TTL-compatible level-shifting circuits.

For engineers reviewing the LM219N datasheet, LM219N pinout, LM219N application, or LM219N equivalent, key selection considerations include its wide supply range (5 V to ±15 V), guaranteed -45 °C to +105 °C industrial temperature rating, open-collector output compatibility with TTL and discrete loads, and 1 µA maximum input bias current over temperature.

Technical Context

The LM219N integrates two independent comparators with bipolar transistor input stages and high-gain differential amplifiers, enabling fast decision-making on analog inputs relative to reference thresholds. Its open-collector outputs allow wired-OR logic and direct drive of lamps, relays, or logic gates without external pull-ups when configured for active-low assertion.

Designed for operation across wide supply voltages, it maintains specified performance from +5 V/0 V up to ±15 V, with input common-mode range extending to within 3 V of either rail. The internal circuitry includes input protection diodes and output stage current limiting, supporting robust interfacing in mixed-signal industrial control systems.

Key Specifications

Pinout & Package

LM219N is supplied in a 14-pin plastic dual in-line package (DIP14) with through-hole mounting. Pin numbering follows standard IC orientation with notch or dot marking pin 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual high-speed comparator applications.

Compared with LM319N, LM219N offers extended temperature operation critical for industrial control; versus LM2901DT, it delivers 16× faster response at the cost of higher quiescent current and narrower input common-mode range.

Availability

LM219N is available at Aetrix Electronics and suitable for relay driver circuits, window voltage detectors, TTL-compatible level shifters, and motor commutation edge detection requiring stable component supply across industrial temperature ranges.

Supply support for LM219N includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The LM219N belongs to ST's legacy precision analog comparator family, engineered for high-speed decision-making in industrial control, power management, and instrumentation where reliability across wide supply and temperature ranges is essential.

FAQ

Can LM219N operate from a single +5 V supply?

Yes. The LM219N is fully specified for single +5 V operation with ground reference. At this supply, input common-mode range extends from 1 V to 4 V, output low voltage remains ≤0.4 V at 3.2 mA sink, and response time increases to approximately 150 ns - all parameters are guaranteed in the datasheet across the full -45 °C to +105 °C range.

What is the purpose of the two separate ground pins (pins 4 and 8)?

Pins 4 and 8 serve as independent signal ground references for comparator A and comparator B, respectively. This separation minimizes crosstalk and ground bounce between channels, especially in high-speed or high-current switching applications. They may be tied together externally if layout constraints require a single ground plane, but isolation improves channel-to-channel rejection.

Does LM219N require external pull-up resistors on its outputs?

Yes. The LM219N features open-collector outputs (pins 3 and 7), which can only sink current. An external pull-up resistor to VCC+ or another logic supply is mandatory to establish a defined high logic level. Typical values range from 1 kΩ (for 25 mA drive) to 10 kΩ (for low-power TTL or CMOS interfacing), selected based on speed and load requirements.

How does LM219N differ from LM311 in terms of output stage?

The LM219N has two open-collector outputs in one package, while the LM311 is a single comparator with identical open-collector architecture. Both support 25 mA sink, but LM219N eliminates inter-device propagation skew and reduces board area in dual-threshold designs. Unlike LM311, LM219N does not offer internal compensation or latch-enable functionality.