STMicroelectronics LM193N

Overview

LM193N from STMicroelectronics is a dual low-power voltage comparator operating from single supplies (+2V to +36V) or split supplies (±1V to ±18V), featuring rail-to-rail input common-mode range including ground, ±1mV typical input offset voltage, and 250mV typical output saturation voltage at 4mA sink current-used in precision threshold detection, transducer signal conditioning, and zero-crossing circuits.

For engineers reviewing the LM193N datasheet, LM193N pinout, LM193N application, or LM193N equivalent, key selection criteria include input offset voltage stability over temperature, guaranteed operation down to −55°C, TTL/CMOS-compatible open-collector outputs, and DIP-8 package compatibility with legacy through-hole PCB layouts.

Technical Context

The LM193N implements two independent PNP-input comparators with input bias currents of 25nA typ., enabling high-impedance reference and sensor interfaces without loading. Its differential input voltage range equals the full supply voltage (±36V max), and input common-mode range extends from ground to V_CC+ − 1.5V.

Output stage uses open-collector NPN transistors capable of sinking up to 16mA, compatible with TTL, DTL, ECL, MOS, and CMOS logic families. Response time is 1.3µs (100mV step, 5mV overdrive) and improves to 300ns with larger overdrive, supporting low-frequency timing and level-shifting applications.

Key Specifications

Pinout & Package

LM193N is supplied in an 8-pin plastic DIP (Dual In-line Package) with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch (2.54 mm), compatible with standard 0.1" pitch protoboards and wave-solder processes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual low-voltage comparator applications.

Compared with LM393N and LM293N, the LM193N offers the widest temperature range (−55°C to +125°C) and tightest input offset voltage (±1mV typ.), making it the only option qualified for aerospace, military, and high-reliability industrial control where full-spec performance must be guaranteed across extreme ambient conditions.

Availability

LM193N is available at Aetrix Electronics and suitable for transducer signal conditioning, zero-crossing detection, battery monitoring, and level-shifting interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM193N 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 LM193 series belongs to ST's precision analog comparators product line, engineered for robust operation in harsh environments with emphasis on input accuracy, supply flexibility, and long-term reliability in safety-critical sensing applications.

FAQ

Can LM193N operate from a single 3.3V supply?

Yes. The LM193N supports single-supply operation down to +2V, so 3.3V is fully within specification. Input common-mode range includes ground, and output can sink current to establish a valid logic-low. However, output high level must be defined by an external pull-up to 3.3V, as the device has no internal level-shifting or push-pull output stage.

Does LM193N require input offset nulling pins?

No. The LM193N does not provide offset nulling terminals. Its input offset voltage is trimmed at wafer test and specified as ±1mV typical at +25°C, with ±4mV maximum over full temperature range. For applications demanding sub-millivolt accuracy, external calibration or post-processing compensation is required.

What is the maximum sink current per output of LM193N?

The LM193N output transistor is rated for 16mA sink current (I_SINK) under specified conditions (V_ID = 1V, V_O = 1.5V). Absolute maximum ratings allow short-term pulses up to 20mA, but continuous operation above 16mA may exceed thermal limits in DIP-8 packaging, especially above +70°C ambient.

Is LM193N pin-compatible with LM339?

No. LM193N is a dual comparator in 8-pin DIP/SO packages; LM339 is a quad comparator in 14-pin packages. While both share PNP-input architecture and open-collector outputs, their pinouts differ fundamentally-LM193N has dedicated V_CC+ and V_CC− pins (Pins 8 and 4), whereas LM339 uses single V+ (Pin 14) and V− (Pin 3). Direct replacement requires PCB redesign.