Texas Instruments TLC393QDRG4Q1

Overview

TLC393QDRG4Q1 from Texas Instruments is a dual micropower voltage comparator with open-drain CMOS outputs, designed for single-supply operation from 4 V to 16 V. It delivers 2.5 µs typical propagation delay (tPLH) with 5-mV overdrive, 5 mV max input offset voltage at 25°C, and consumes only 110 µW typical at 5 V - enabling precision threshold detection in automotive power-supply supervision and motor control feedback loops.

For engineers reviewing the TLC393QDRG4Q1 datasheet, TLC393QDRG4Q1 pinout, TLC393QDRG4Q1 application, or TLC393QDRG4Q1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification (−40°C to 125°C), open-drain output compatibility with mixed-voltage logic interfaces, low input bias current (5 pA typ at 25°C), and stable common-mode rejection (84 dB min over temperature).

Technical Context

The TLC393QDRG4Q1 uses Texas Instruments' LinCMOS™ process to achieve high input impedance (>10¹² Ω), ultra-low input bias current, and exceptional input offset voltage stability-even under ±18 V differential input stress. Its dual independent comparators share no internal coupling, supporting asynchronous decision-making in safety-critical monitoring paths.

Each comparator features rail-to-rail input capability (VIC range: 0 to VDD − 1.5 V), open-drain output stage compatible with pull-up voltages up to 16 V, and built-in ESD protection exceeding 2 kV HBM and 750 V CDM per AEC-Q100 requirements. The device avoids linear-region operation during testing to prevent gate damage, requiring non-servo measurement methods for offset validation.

Key Specifications

Pinout & Package

Package: SOIC-8 (D package), 3.91 mm × 4.90 mm body, 1.75 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM393QDRQ1 and TLC3702CDR, the TLC393QDRG4Q1 uniquely combines AEC-Q100 Grade 1 compliance, 5 mV offset guarantee, and open-drain versatility - making it the only option qualified for safety-critical automotive voltage monitoring where both reliability and interface flexibility are mandatory.

Availability

TLC393QDRG4Q1 is available at Aetrix Electronics and suitable for automotive power-supply supervision, motor control feedback, and battery voltage monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TLC393QDRG4Q1 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 connectivity technologies, with decades of automotive-grade product development and manufacturing expertise.

The TLC393-Q1 belongs to TI's automotive-qualified LinCMOS™ comparator family, engineered specifically for high-reliability voltage monitoring in engine control, body electronics, and ADAS subsystems operating under harsh thermal and electrical conditions.

FAQ

What is the maximum supply voltage rating for the TLC393QDRG4Q1?

The TLC393QDRG4Q1 has an absolute maximum supply voltage (VDD) of 18 V. However, its recommended operating range is 4 V to 16 V. Operating continuously at 18 V exceeds specification limits and may impact long-term reliability or parametric performance - always maintain VDD ≤16 V in production designs using TLC393QDRG4Q1.

Does the TLC393QDRG4Q1 support rail-to-rail input operation?

The TLC393QDRG4Q1 supports a common-mode input voltage range from 0 V to VDD − 1.5 V - not true rail-to-rail. Inputs must remain ≥0 V and ≤VDD − 1.5 V to ensure proper comparator function. Exceeding this range risks incorrect output states or increased input current; the device remains undamaged if input current is limited to <5 mA, per TLC393QDRG4Q1 datasheet Section 6.1.

How does the open-drain output of the TLC393QDRG4Q1 interface with 3.3 V logic?

The TLC393QDRG4Q1 open-drain outputs require an external pull-up resistor to a logic-compatible voltage (e.g., 3.3 V). When the output transistor is off, the pin rises to the pull-up voltage; when on, it sinks current to GND. This allows seamless interfacing with 3.3 V microcontrollers while powering the TLC393QDRG4Q1 from a separate 5 V or 12 V rail - a key advantage in mixed-voltage automotive systems.

Is the TLC393QDRG4Q1 pin-compatible with the standard LM393?

Yes, the TLC393QDRG4Q1 is pin-compatible with the LM393 in SOIC-8 (D) package: pin assignments for VDD, GND, IN+, IN−, and OUT are identical. However, the TLC393QDRG4Q1 offers lower power, faster response, tighter offset, and AEC-Q100 qualification - making it a direct functional upgrade where automotive reliability is required.

What decoupling capacitance is recommended for the TLC393QDRG4Q1?

A 0.1 µF ceramic capacitor placed as close as possible to the VDD pin (Pin 8) and GND (Pin 4) is mandatory for stable operation of the TLC393QDRG4Q1. For noisy automotive environments, TI recommends adding a bulk 10 µF tantalum or aluminum electrolytic capacitor in parallel - especially when used in supply supervisors or motor control feedback paths where transient immunity is critical.