Texas Instruments LM193FKB

Overview

LM193FKB from Texas Instruments is a dual differential comparator IC designed for high-reliability military-grade applications, operating across −55°C to +125°C. It features open-collector outputs, 2 V to 36 V single/dual supply capability, 2 mV typical input offset voltage, 25 nA typical input bias current, and common-mode input range extending to ground - enabling precise threshold detection in motor control, weigh scale, and sensor interface circuits.

For engineers reviewing the LM193FKB datasheet, LM193FKB pinout, LM193FKB application, or LM193FKB equivalent, key selection considerations include its MIL-PRF-38535 qualification, LCCC-20 hermetic package, −55°C to +125°C temperature range, open-drain output compatibility with TTL/MOS/CMOS logic, and differential input voltage tolerance up to ±36 V.

Technical Context

The LM193FKB integrates two independent comparators with PNP Darlington-pair inputs, delivering high gain and low input bias current while limiting common-mode range to 0 V to V_CC−1.5 V (−55°C to +125°C). Its open-drain NPN output stage sinks current when IN− exceeds IN+, enabling wired-AND logic and flexible level-shifting.

It supports single-supply operation down to 2 V and withstands absolute maximum supply voltages up to 36 V, with differential input voltage range equal to the full supply rating. Input overdrive directly governs response time - e.g., 100 mV overdrive yields ~1.3 µs typical propagation delay at 25°C with 5 V supply.

Key Specifications

Pinout & Package

LCCC (FK) 20-pin hermetically sealed ceramic package, 9.00 mm × 9.00 mm body size, 1.27 mm pitch, with no internal connections on pins 1, 3, 4, 6, 8, 9, 11, 13, 14, 16, 18, and 19.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM193FKB, LM2903VDR offers automotive qualification but sacrifices military temperature range and screening, while LM393DR provides lower-cost commercial performance at the expense of reliability assurance and thermal robustness - making LM193FKB the sole choice for mission-critical −55°C to +125°C deployments.

Availability

LM193FKB is available at Aetrix Electronics and suitable for motor control, chemical sensing, weigh scale, and desktop PC power monitoring applications requiring stable component supply across extended temperature and high-reliability environments.

Supply support for LM193FKB 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 company specializing in analog and embedded processing technologies, with leadership in high-reliability analog ICs for industrial, aerospace, and defense markets.

The LM193 family was engineered for ruggedized voltage comparison in safety-critical systems - emphasizing wide supply range, ground-sensing capability, and MIL-PRF-38535 compliance to meet stringent environmental and reliability requirements.

FAQ

What is the operating temperature range of the LM193FKB?

The LM193FKB is characterized for operation from −55°C to +125°C and is fully tested per MIL-PRF-38535 requirements across this full range. This makes LM193FKB suitable for deployment in aerospace avionics, downhole oilfield tools, and military vehicle electronics where extreme thermal stability is mandatory.

Does the LM193FKB support single-supply operation?

Yes, the LM193FKB supports true single-supply operation from 2 V to 36 V. Its input common-mode range includes ground (0 V), and its open-collector outputs allow pull-up to any compatible logic voltage - eliminating the need for dual supplies in most industrial sensing and control applications using LM193FKB.

What package type is used for the LM193FKB?

The LM193FKB uses the FK package: a 20-pin hermetically sealed Leadless Ceramic Chip Carrier (LCCC) with 9.00 mm × 9.00 mm body size and 1.27 mm pitch. This ceramic package provides superior moisture resistance, thermal stability, and reliability for high-reliability military and aerospace applications using LM193FKB.

Can the LM193FKB outputs be wired together?

Yes, the LM193FKB features open-collector outputs that can be externally wired together to implement wired-AND logic - for example, combining multiple fault signals into a single system interrupt line. This functionality is explicitly supported in the LM193FKB datasheet and requires only a shared pull-up resistor to the desired logic rail.

How does the LM193FKB handle input voltages exceeding the common-mode range?

Per the LM193FKB datasheet, if either input exceeds the common-mode range (0 V to V_CC−1.5 V), the output state remains valid as long as the other input stays within range - e.g., if IN+ is at V_CC and IN− is within range, the output reflects correct polarity. However, both inputs above range force low output, and inputs below −0.3 V risk excessive current and incorrect behavior. This behavior is guaranteed for LM193FKB.