STMicroelectronics LM193DT

Overview

LM193DT from STMicroelectronics is a dual low-voltage comparator IC designed for single-supply operation from 2 V to 36 V (or ±1 V to ±18 V), featuring ±1 mV typical input offset voltage, 20 nA typical input bias current, and 80 mV typical output saturation voltage at 4 mA sink. It supports ground-sensing inputs and TTL/CMOS-compatible open-collector outputs, commonly used in zero-crossing detection, limit comparators, and transducer signal conditioning in industrial sensor interfaces.

For engineers reviewing the LM193DT datasheet, LM193DT pinout, LM193DT application, or LM193DT equivalent, key selection criteria include input common-mode range including ground, low supply current (0.45 mA at 5 V), differential input voltage tolerance up to ±36 V, and SO8 packaging with -55°C to +125°C operating temperature range.

Technical Context

The LM193DT implements two independent PNP-input comparators with rail-to-rail differential input capability and common-mode range extending to ground on single supply-enabling direct interfacing with sensors referenced to system ground. Its open-collector outputs support wired-OR logic and level translation across mixed-voltage systems.

Internal design ensures stable operation over wide supply ranges without external compensation; propagation delay is 1.3 μs (100 mV step, 5 mV overdrive) and large-signal response time is 300 ns under TTL-compatible conditions. Input offset voltage drift is specified across full temperature range, supporting precision threshold detection in harsh environments.

Key Specifications

Pinout & Package

LM193DT is supplied in SO8 package (standard small-outline integrated circuit, 150 mil width, 1.27 mm pitch). The exposed pad is absent - no thermal pad connection required.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM393DT and LM293DT, the LM193DT provides the widest temperature range (-55°C to +125°C) and highest junction temperature rating (150°C), making it the sole choice for aerospace, military, and extreme-environment industrial deployments where thermal margin is critical.

Availability

LM193DT is available at Aetrix Electronics and suitable for industrial motor control, automotive engine management, and high-reliability sensor interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM193DT 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 intelligent power, sensing, and control solutions for automotive, industrial, and consumer markets.

The LM193 series belongs to ST's legacy precision analog comparator product line, engineered specifically for robust, low-power threshold detection in harsh environments where ground-referenced sensing and wide supply tolerance are mandatory.

FAQ

What is the maximum differential input voltage the LM193DT can withstand?

The LM193DT supports a differential input voltage of ±36 V, meaning either input may exceed the supply rails by up to 36 V as long as the other remains within the common-mode range. This allows safe operation during transient overvoltage events such as inductive kickback or ESD coupling without damage or false triggering.

Can the LM193DT operate from a 3.3 V supply?

Yes - the LM193DT functions reliably from 2 V to 36 V single supply, including 3.3 V. At 3.3 V, input offset voltage remains ±1 mV typ., output saturation stays below 400 mV at 4 mA sink, and supply current is ~0.45 mA, enabling direct integration into modern low-voltage embedded systems without level shifting.

Does the LM193DT have internal ESD protection?

No - the LM193DT does not include enhanced ESD protection. The LM393W variant adds 2 kV HBM protection on all pins. LM193DT relies on standard process-level ESD robustness (HBM Class H1B, ≥500 V), sufficient for board-level handling but requiring external TVS diodes in high-noise industrial or automotive harness environments.

How does the LM193DT differ from the LM339?

The LM193DT is a dual comparator; the LM339 contains four comparators in the same SO8 package. Both share identical input characteristics and open-collector outputs, but LM193DT offers half the channel count - advantageous when only two thresholds are needed, reducing layout area and simplifying routing while maintaining identical per-channel performance and temperature rating.