STMicroelectronics LM219D

Overview

LM219D from STMicroelectronics is a high-speed dual comparator IC designed for precision voltage comparison in industrial and instrumentation systems operating from ±5 V to ±15 V supplies. It delivers 80 ns typical response time at ±15 V, supports ±12 V common-mode input range, features open-collector outputs capable of sinking 25 mA, and maintains ≤1 µA max input bias current over –45 °C to +105 °C.

For engineers reviewing the LM219D datasheet, LM219D pinout, LM219D application, or LM219D equivalent, key selection criteria include its wide supply range compatibility with TTL logic, fast propagation delay under overdrive conditions, dual independent comparator architecture, and SO-14 package suitability for space-constrained PCB layouts.

Technical Context

The LM219D implements two fully independent comparators with internal differential input stages, high-gain transistors, and open-collector NPN output drivers. Its input stage uses matched bipolar transistors enabling low offset (≤4 mV typ) and low input bias current (≤500 nA typ) across temperature.

It operates with asymmetric or symmetric supplies (e.g., +5 V/0 V or ±15 V), supports input voltages up to ±13 V common-mode, and exhibits stable switching behavior with ≥100 mV overdrive - critical for clean digital edge generation in relay drivers and window detectors.

Key Specifications

Pinout & Package

LM219D is packaged in a 14-pin SOIC (SO-14) surface-mount plastic micropackage with standard 1.27 mm pitch, 8.55–8.75 mm body width, and 5.8–6.2 mm body length per STMicroelectronics mechanical drawing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM319D and TLV3502IDR, LM219D uniquely balances industrial temperature range, ±15 V capability, and 80 ns speed - making it the only option among the three suitable for relay-driven motor control and dual-supply analog monitoring.

Availability

LM219D is available at Aetrix Electronics and suitable for motor control systems, industrial power supplies, and programmable logic controller (PLC) I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM219D 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, delivering silicon solutions for automotive, industrial, and power management applications since 1987.

The LM219 belongs to ST's legacy precision analog comparator product line, engineered specifically for high-reliability industrial systems demanding wide supply flexibility, fast response, and robust ESD tolerance in harsh environments.

FAQ

Can LM219D operate from a single +5 V supply?

Yes, LM219D is fully specified for single +5 V operation with ground as the negative rail. Input common-mode range extends to 1 V above ground, and output can sink up to 25 mA into a pull-up resistor tied to +5 V. Performance metrics such as response time and offset voltage remain valid per datasheet Table 3 conditions.

What is the maximum output sink current per channel?

The LM219D output stage is rated for 25 mA continuous sink current per channel at T_A = 25 °C, with VOL ≤ 0.75 V. Derating applies above 25 °C: at 105 °C ambient, maximum safe sink current drops to approximately 18 mA to maintain junction temperature below 150 °C with typical SO-14 R_thJA = 105 °C/W.

Does LM219D require external hysteresis for noise immunity?

LM219D does not integrate internal hysteresis. External positive feedback (e.g., resistor from output to non-inverting input) is required to prevent oscillation near threshold in noisy environments. Typical hysteresis width is set by resistor ratio and output swing - e.g., 100 kΩ feedback + 1 MΩ to ground yields ~140 mV hysteresis at ±15 V supply.

Is LM219D pin-compatible with LM319D?

Yes, LM219D and LM319D share identical SO-14 pinout and terminal functions per STMicroelectronics datasheet Figure 1 and Table 21. However, they differ in temperature grade, input offset, and bias current specifications - direct substitution is electrically possible but may affect system accuracy or thermal margin in extended-temperature applications.