Texas Instruments TLC374MDG4

Overview

TLC374MDG4 from Texas Instruments is a military-grade LinCMOS™ quadruple differential comparator IC operating from single or dual supplies (4 V to 16 V), featuring 5 mV max input offset voltage at 25°C, 5 pA typical input bias current, and 200 ns typical response time for TTL-level inputs. It delivers n-channel open-drain outputs compatible with TTL/MOS/CMOS logic and supports operation across –55°C to 125°C for ruggedized analog monitoring in avionics power sequencing and radiation-tolerant sensor interfaces.

For engineers reviewing the TLC374MDG4 datasheet, TLC374MDG4 pinout, TLC374MDG4 application, or TLC374MDG4 equivalent, key selection criteria include its military temperature range, ultra-low input bias current, open-drain output architecture requiring external pull-up, LinCMOS™ process ESD robustness (1000-V HBM), and pin compatibility with LM339 in SOIC-14 packaging.

Technical Context

The TLC374MDG4 integrates four independent high-impedance comparators on a single die using Texas Instruments' LinCMOS™ polysilicon-gate complementary-MOS process, enabling rail-to-rail common-mode input voltage range down to ground and supporting single-supply operation without level-shifting circuitry. Its input stage achieves 10¹² Ω typical impedance and 5 pA typical bias current, minimizing loading on high-Z sources like precision voltage dividers or piezoelectric sensors.

Each comparator features an n-channel open-drain output stage, allowing wired-AND logic implementation and flexible interface to multiple logic families via external pull-up resistors. The device includes patented internal ESD protection rated to 1000 V (HBM) and operates with supply current as low as 300 µA per comparator at 5 V, making it suitable for low-power, wide-voltage industrial control and test equipment.

Key Specifications

Pinout & Package

Package: SOIC-14 (D package), 14-pin narrow-body surface-mount plastic dual in-line package with 1.27 mm pitch and standard JEDEC MS-012 footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM339N, TLC374MDG4 provides 50,000× lower input bias current and military temperature range, enabling precision high-Z sensing; compared with TLC374MFKB, it offers lower-cost SOIC packaging while retaining identical electrical behavior and qualification.

Availability

TLC374MDG4 is available at Aetrix Electronics and suitable for avionics power sequencing, ruggedized sensor interfaces, overvoltage protection latches, and redundant voting systems requiring stable component supply across extended temperature and long lifecycle programs.

Supply support for TLC374MDG4 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, embedded processing, and high-reliability components for industrial, automotive, aerospace, and communications markets.

The TLC374MDG4 belongs to TI's LinCMOS™ precision comparator product line, engineered for ultra-low input current, wide supply range, and military-grade environmental resilience in mission-critical analog decision-making circuits.

FAQ

What is the maximum supply voltage rating for the TLC374MDG4?

The TLC374MDG4 has an absolute maximum supply voltage (VDD) rating of 18 V, but its recommended operating range is 4 V to 16 V. Operating beyond 16 V may cause parametric degradation or reduced reliability, especially at temperature extremes. The device is designed for robust performance at 5 V, 12 V, and 15 V nominal rails commonly found in military and avionics power systems. Always observe derating curves in the dissipation rating table for sustained high-temperature operation.

Does the TLC374MDG4 support dual-supply operation, and what are the limits?

Yes, the TLC374MDG4 supports dual-supply operation with a minimum differential supply voltage of 2 V and maximum of 18 V between VDD and GND. For example, it can operate with +15 V and –5 V supplies (20 V total), but the difference must stay within 2–18 V. The common-mode input range includes ground, allowing inputs to swing below GND if current-limited to ±5 mA. This capability enables bipolar signal conditioning in instrumentation and test equipment without level-shifting circuitry.

Why does the TLC374MDG4 require external pull-up resistors on its outputs?

The TLC374MDG4 uses n-channel open-drain output stages, which can only sink current - they cannot source it. External pull-up resistors are mandatory to establish a defined HIGH logic level when the output is inactive. Pull-up values typically range from 2.2 kΩ to 10 kΩ depending on speed and load capacitance. This architecture enables wired-AND logic, mixed-voltage interfacing (e.g., 5 V comparator driving 3.3 V MCU), and simplified fault-bus aggregation - all essential in safety-critical systems where the TLC374MDG4 is deployed.

How does the input offset voltage stability of the TLC374MDG4 impact long-term system calibration?

The TLC374MDG4 exhibits ultrastable input offset voltage with a typical change of only 0.23 µV/month, including the first 30 days. This exceptional drift performance minimizes recalibration frequency in precision monitoring systems such as flight data recorders or engine health management units. Unlike many comparators that require periodic zero-adjustment, the TLC374MDG4 maintains threshold accuracy over years of continuous operation - a key advantage in sealed or inaccessible installations where field maintenance is impractical.

Is the TLC374MDG4 pin-compatible with the LM339, and are there any layout considerations?

Yes, the TLC374MDG4 is pin-compatible with the LM339 in the SOIC-14 (D) package, sharing identical pin assignments for all 14 terminals. However, layout must account for differences: TLC374MDG4's LinCMOS™ process demands tighter power supply decoupling (0.1 µF ceramic close to VDD/GND pins) and guarding of high-impedance inputs to prevent leakage-induced errors. Also, its lower supply current reduces thermal rise, allowing denser placement - but verify thermal derating per the dissipation table when operating near 125°C ambient.