Texas Instruments TPS3779CDRYR

Overview

TPS3779CDRYR from Texas Instruments is a dual-channel, push-pull output voltage detector IC designed for precision rail monitoring in low-power systems. It features 1% threshold accuracy, 10% factory-set hysteresis, 2 µA typical quiescent current, and operates across 1.5 V to 6.5 V supply and –40°C to 125°C temperature range. It is used to assert reset signals for microcontrollers during undervoltage conditions on two independent power rails.

For engineers reviewing the TPS3779CDRYR datasheet, TPS3779CDRYR pinout, TPS3779CDRYR application, or TPS3779CDRYR equivalent, this page delivers verified electrical specifications, thermal behavior at temperature extremes, dual-threshold timing response (tPD(r) = 5.5 µs, tSD = 570 µs), and design guidance for resistor-divider configuration of adjustable SENSE inputs.

Technical Context

The TPS3779CDRYR integrates two independent high-accuracy comparators with internal reference trimming-VIT+ = 1.182 V (±1%) and VIT– = 1.074 V (10% hysteresis)-enabling precise undervoltage detection with noise immunity. Its push-pull outputs drive high/low without external pull-ups, simplifying interface to 3.3-V or 5-V logic reset inputs.

Each SENSE input accepts 0–6.5 V regardless of VDD level, supporting monitoring of higher-voltage rails (e.g., 5 V, 12 V via divider) while powered from a lower VDD (e.g., 3.3 V). Startup delay (tSD = 570 µs) ensures stable output assertion after VDD crosses VDD(min), and propagation delays remain stable across temperature (tPD(f) ≤ 10 µs, –40°C to +125°C).

Key Specifications

Pinout & Package

TPS3779CDRYR is housed in a 1.45 mm × 1.00 mm, 6-pin µSON (DRY) package with wettable flanks for automated optical inspection. The package supports reflow soldering per JEDEC J-STD-020 and has RθJA = 306.7°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel voltage detector applications.

Compared with TPS3779CDRYR, the TPS3779BDRYR offers reduced hysteresis for tighter threshold control but sacrifices noise immunity, while the TPS3780CDRYR trades push-pull simplicity for open-drain flexibility-making it essential for multi-supervisor reset buses or level-translated interfaces.

Availability

TPS3779CDRYR is available at Aetrix Electronics and suitable for power-supply sequencing, microcontroller reset management, early warning detection, and industrial sensor node monitoring requiring stable component supply across automotive, medical, and industrial temperature grades.

Supply support for TPS3779CDRYR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The TPS37xx family was designed specifically for high-accuracy, low-quiescent-current dual-rail voltage supervision in space- and power-constrained embedded systems - emphasizing precision threshold stability over temperature and minimal external component count.

FAQ

What is the factory-set hysteresis value for TPS3779CDRYR?

The TPS3779CDRYR has a factory-set hysteresis of 10%, resulting in VIT– = 1.074 V when VIT+ = 1.182 V. This value is laser-trimmed during production and does not require external components. The 10% hysteresis provides robust immunity to rail noise in industrial and automotive environments, and is confirmed in the Electrical Characteristics table of the SBVS250 datasheet. TPS3779CDRYR maintains this hysteresis across its full operating temperature range.

Can TPS3779CDRYR monitor a 5 V rail while powered from a 3.3 V supply?

Yes, TPS3779CDRYR can monitor a 5 V rail while powered from 3.3 V. Its SENSE1 and SENSE2 inputs accept voltages from 0 V to 6.5 V independent of VDD, enabling direct connection to higher-voltage rails via resistor dividers. For a 5 V rail, a standard 2-resistor divider (e.g., R1 = 1.13 MΩ, R2 = 787 kΩ) scales the voltage to ~1.18 V at SENSE1 - matching the TPS3779CDRYR's VIT+ threshold. This capability is explicitly supported in the datasheet's "Sense Resistor Divider" section.

What is the maximum sink current capability of TPS3779CDRYR's push-pull outputs?

TPS3779CDRYR's OUT1 and OUT2 push-pull outputs each support a maximum sink current of 5 mA at VOL ≤ 0.3 V (VDD ≥ 4.5 V, TJ = 25°C), as specified in the Electrical Characteristics table. This allows direct driving of standard CMOS reset inputs (e.g., ARM, MSP430, STM32) without external pull-up resistors. The output remains functional up to ±20 mA absolute maximum, but sustained operation above 5 mA may increase VOL beyond logic-low thresholds and is not recommended for long-term reliability.

How does the startup delay (tSD) of TPS3779CDRYR affect system reset timing?

The TPS3779CDRYR has a fixed startup delay (tSD) of 570 µs, which begins when VDD crosses VDD(min) after power-on or a brownout event. During this interval, outputs remain in an undefined state and must not be relied upon for system reset. This delay ensures internal reference stabilization before asserting valid logic levels. For systems requiring immediate reset assertion, designers must account for this 570 µs latency in power-on timing budgets - especially in applications with tight boot windows such as automotive ECUs or real-time controllers.

Is TPS3779CDRYR RoHS-compliant and halogen-free?

Yes, TPS3779CDRYR is RoHS-compliant and halogen-free, meeting JEDEC J-STD-609 Category 1 (Br < 900 ppm, Cl < 900 ppm, total halogens < 1500 ppm) and EU Directive 2011/65/EU. This is documented in Texas Instruments' official packaging and environmental compliance reports for the DRY package. The µSON (DRY) package uses lead-free NiPdAu terminal finish and green molding compound, and is rated for 260°C peak reflow per JEDEC J-STD-020.