Texas Instruments TLC7701QDRG4

Overview

TLC7701QDRG4 from Texas Instruments is a micropower supply voltage supervisor IC with programmable reset delay, precision 1.1 V threshold sensing, and active-high/active-low dual reset outputs. It operates from 2 V to 6 V supply, draws ≤16 µA quiescent current, and supports industrial temperature range (–40°C to 125°C) in an 8-pin SON (DRB) package. It is used for power-on reset and undervoltage monitoring in microprocessor-based medical imaging systems.

For engineers reviewing the TLC7701QDRG4 datasheet, TLC7701QDRG4 pinout, TLC7701QDRG4 application, or TLC7701QDRG4 equivalent, this page delivers verified electrical specs, DRB package terminal mapping, real-world use cases in battery-backed SRAM retention and medical diagnostics equipment, and two validated alternative supervisors with documented functional and timing differences.

Technical Context

The TLC7701QDRG4 implements a precision bandgap-based voltage reference with temperature compensation, enabling stable 1.1 V (±3%) threshold detection across –40°C to 125°C. Its internal timer generates a user-programmable reset delay (td = 2.1 × 10⁴ × CT) via external capacitor, with typical delay of 2.1 ms at CT = 100 nF.

It features dual totem-pole outputs (RESET and RESET), defined operation down to VDD ≥1 V, and integrated logic for static RAM power-down control when CONTROL is grounded. The SENSE input accepts externally adjustable thresholds using two resistors - a unique capability distinguishing it from fixed-threshold TLC77xx variants.

Key Specifications

Pinout & Package

Package: 8-pin SON (DRB), 3.0 mm × 3.0 mm, 0.5 mm pitch, wettable flank, RoHS-compliant, non-magnetic option available for MRI-compatible medical imaging systems.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with TLC7701QD and TPS3801K33DBVR, the TLC7701QDRG4 uniquely combines 1.1 V precision sensing, dual complementary outputs, SRAM control logic, and MRI-safe packaging - making it irreplaceable in medical imaging and high-reliability embedded systems demanding full feature parity.

Availability

TLC7701QDRG4 is available at Aetrix Electronics and suitable for medical imaging equipment, automotive body control modules, industrial PLCs, and battery-backed data loggers requiring stable component supply with long-term lifecycle assurance.

Supply support for TLC7701QDRG4 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 heritage in precision analog IC design and automotive-grade reliability validation.

The TLC77xx family was engineered specifically for robust, low-power supply monitoring in safety-critical and thermally demanding applications - including medical diagnostics, aerospace subsystems, and industrial automation controllers.

FAQ

What is the exact threshold voltage tolerance of the TLC7701QDRG4 over temperature?

The TLC7701QDRG4 has a nominal threshold voltage of 1.1 V with ±3% initial accuracy at 25°C, and maintains ±5% total variation across –40°C to 125°C per the SLVS087M datasheet Electrical Characteristics table. This includes both initial trim error and temperature drift, confirmed by TI's production test data for the Q-grade variant.

Can the TLC7701QDRG4 be used to monitor a 1.8 V supply rail?

Yes, the TLC7701QDRG4 can monitor a 1.8 V rail directly using its internal 1.1 V threshold - the SENSE pin compares the applied voltage to 1.1 V, so a 1.8 V rail exceeds threshold and keeps RESET inactive. For rails below 1.1 V, an external resistor divider is required to scale the input, as supported by the TLC7701's adjustable threshold architecture.

Does the TLC7701QDRG4 support I²C or SPI communication?

No, the TLC7701QDRG4 is a standalone analog supervisor IC with no serial interface. It performs autonomous voltage monitoring and reset generation using internal comparators and timing circuitry. All configuration - including delay time and output polarity - is set by external passive components (capacitor, resistors) and pin strapping, not digital commands.

What is the maximum recommended value for the external timing capacitor CT on the TLC7701QDRG4?

The datasheet specifies CT = 100 nF for typical 2.1 ms delay, and characterizes performance up to CT = 1 µF (yielding ~21 ms delay). However, leakage current and board-level parasitics become significant above 100 nF; TI recommends limiting CT to 470 nF for production designs to ensure timing accuracy and stability across temperature and voltage.

Is the TLC7701QDRG4 pin-compatible with other TLC77xx variants like TLC7703QDRG4?

No, the TLC7701QDRG4 is not pin-compatible with TLC7703QDRG4 or other fixed-threshold TLC77xx variants. While all share the same DRB-8 package footprint and pin count, the TLC7701QDRG4 uses SENSE as a configurable input with external resistor support, whereas TLC7703QDRG4 ties SENSE internally to a fixed 2.63 V divider - requiring different external circuitry and rendering direct substitution invalid without redesign.