Texas Instruments LM193AH

Overview

LM193AH from Texas Instruments is a military-grade dual precision voltage comparator with ±3 mV maximum input offset voltage, 0.4 mA supply current at 5 V, and operation from 2.0 V to 36 V single or ±1.0 V to ±18 V dual supplies. It features rail-to-rail input common-mode range including ground and open-collector outputs compatible with TTL/CMOS logic-used in battery-powered instrumentation, aerospace power monitoring, and high-reliability industrial control systems.

For engineers reviewing the LM193AH datasheet, LM193AH pinout, LM193AH application, or LM193AH equivalent, key selection considerations include its −55°C to +125°C operating junction temperature, TO-99 metal-can package, input bias current of 25 nA, and compatibility with single-supply zero-crossing detection and limit-comparator circuits requiring military-specified reliability.

Technical Context

The LM193AH implements two independent PNP-input comparators with open-collector NPN output stages, enabling direct interface to TTL, CMOS, ECL, and MOS logic families. Its input stage allows common-mode voltage down to ground on single supply and supports differential input voltages up to 36 V without damage.

It operates with no external compensation and requires no dual supplies-its input bias current remains stable across supply voltage (2.0–36 V), and output saturation voltage is specified at 250 mV max under 4 mA sink load, ensuring reliable low-level logic assertion in safety-critical analog thresholding applications.

Key Specifications

Pinout & Package

LM193AH is housed in an 8-pin TO-99 metal can package (9.08 mm × 9.08 mm body size), hermetically sealed for military environmental robustness and thermal stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM193H and LM2903H, the LM193AH delivers superior precision (±3 mV vs. ±5/±7 mV), broader temperature capability (−55°C to +125°C), and hermetic reliability-making it the sole choice for mission-critical analog thresholding where parameter stability under thermal stress and radiation exposure is non-negotiable.

Availability

LM193AH is available at Aetrix Electronics and suitable for aerospace power monitoring, battery-operated instrumentation, and industrial motor control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM193AH 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

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of heritage in precision analog ICs for defense, industrial, and automotive markets.

The LM193AH belongs to TI's military-qualified comparator family designed specifically for high-reliability applications demanding guaranteed performance across extreme temperatures, hermetic packaging, and rigorous screening per MIL-PRF-38535 and RETS193AX specifications.

FAQ

What is the maximum operating junction temperature for LM193AH?

The LM193AH has a maximum operating junction temperature of +125°C, validated per RETS193AX military specification. This rating is confirmed in Section 6.3 of the SNOSBJ6G datasheet and distinguishes it from commercial variants like LM393-N (max +70°C) and LM2903-N (max +85°C). The LM193AH's thermal design supports sustained operation in engine compartments, avionics bays, and other high-ambient environments where thermal margin is critical.

Does LM193AH support single-supply operation with ground-referenced inputs?

Yes, LM193AH fully supports single-supply operation with input common-mode voltage range extending to ground (0 V), as explicitly stated in the "Features" and "Description" sections of the SNOSBJ6G datasheet. This capability enables direct connection of sensors such as current-shunt amplifiers or thermistor networks without level-shifting circuitry-critical for battery-monitoring and zero-crossing detection applications where ground-referenced signals dominate.

What package type is used for LM193AH, and how does it differ from LM193-N?

LM193AH uses the 8-pin TO-99 metal-can package (9.08 mm × 9.08 mm), whereas LM193-N is offered in PDIP, SOIC, and DSBGA variants. The TO-99 provides hermetic sealing, superior thermal conductivity, and enhanced EMI shielding-key for military platforms. Per the Device Information table in SNOSBJ6G, LM193AH's TO-99 construction directly enables its −55°C to +125°C qualification and compliance with RETS193AX screening requirements.

What is the typical supply current draw of LM193AH at 5 V?

The LM193AH draws 0.4 mA typical supply current at 5 V, as specified in Section 6.5 ("Electrical Characteristics: LM193A V+= 5 V, TA = 25°C") of the SNOSBJ6G datasheet. This value is independent of supply voltage magnitude across the 2.0–36 V range, making it ideal for energy-constrained applications such as handheld test equipment and remote telemetry nodes where ultra-low quiescent current is mandatory.

How does the output stage of LM193AH interface with TTL and CMOS logic?

The LM193AH features open-collector NPN output transistors capable of sinking up to 16 mA, with saturation voltage ≤250 mV at 4 mA. When paired with an external pull-up resistor to any logic supply (e.g., 3.3 V or 5 V), it delivers clean TTL- and CMOS-compatible LOW/HIGH levels. This architecture-confirmed in Section 7.3 ("Feature Description") and Figure 11 of SNOSBJ6G-enables direct interfacing without level shifters, supporting mixed-voltage system designs common in legacy avionics and industrial controllers.