Texas Instruments TPS3779CQDBVRQ1

Overview

TPS3779CQDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 dual-channel voltage detector IC for automotive power-rail monitoring, featuring 10% factory-set hysteresis, ±1% threshold accuracy over –40°C to +125°C, 2 µA typical quiescent current, and push-pull outputs. It monitors two independent supply rails (e.g., 3.3 V and 3.0 V) with adjustable thresholds via external resistor dividers and drives reset/enable inputs of MCUs or PMICs in ADAS and infotainment systems.

For engineers reviewing the TPS3779CQDBVRQ1 datasheet, TPS3779CQDBVRQ1 pinout, TPS3779CQDBVRQ1 application, or TPS3779CQDBVRQ1 equivalent, key selection considerations include its 10% hysteresis option, SOT-23-6 package, push-pull output architecture, –40°C to +125°C operation, and dual independent sense inputs with <±0.4% temperature-induced VIT+ deviation.

Technical Context

The TPS3779CQDBVRQ1 implements two independent high-accuracy comparators with internal reference trimming, each supporting adjustable detection thresholds down to 1.2 V via external resistor dividers. Its 10% hysteresis is factory-set and fixed-no external configuration required-and ensures immunity to rail noise during undervoltage events.

It operates across 1.5 V to 5.5 V VDD and supports input voltages up to 5.5 V on SENSE1/SENSE2 independent of VDD. Outputs are push-pull (not open-drain), eliminating need for external pullups and enabling direct interfacing with 3.3-V CMOS reset inputs without level-shifting.

Key Specifications

Pinout & Package

SOT-23-6 package (2.90 mm × 1.60 mm body size), surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3779CQDBVRQ1, the TPS3779BQDBVRQ1 offers reduced hysteresis for finer trip resolution, while the TPS3780CQDBVRQ1 trades push-pull simplicity for voltage-level flexibility-neither is pin-compatible due to differing output architectures, requiring layout review for replacement.

Availability

TPS3779CQDBVRQ1 is available at Aetrix Electronics and suitable for automotive ADAS, infotainment, and cluster instrumentation applications requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.

Supply support for TPS3779CQDBVRQ1 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 delivering analog and embedded processing solutions for automotive, industrial, and personal electronics markets.

The TPS37xx-Q1 product line delivers high-accuracy, low-power dual-channel voltage supervisors specifically engineered for automotive power-rail monitoring and fail-safe system reset sequencing.

FAQ

What is the hysteresis value of the TPS3779CQDBVRQ1?

The TPS3779CQDBVRQ1 has a factory-set hysteresis of 10%, which is fixed and non-adjustable. This value is trimmed during manufacturing and specified across the full operating temperature range (–40°C to +125°C). The 10% hysteresis ensures reliable rejection of transient noise on monitored supply rails without requiring external components or configuration. This distinguishes the TPS3779CQDBVRQ1 from other variants like the TPS3779BQDBVRQ1 (5% hysteresis) and confirms its suitability for noisy automotive environments where robust undervoltage detection is critical. The hysteresis directly defines the gap between VIT+ and VIT– thresholds.

Does the TPS3779CQDBVRQ1 require external pullup resistors on its outputs?

No, the TPS3779CQDBVRQ1 does not require external pullup resistors because it features push-pull outputs (OUT1 and OUT2). Each output actively drives high to VDD and low to GND, eliminating dependency on external biasing. This simplifies PCB layout, reduces component count, and ensures deterministic logic levels compatible with standard 3.3-V CMOS inputs. In contrast, the open-drain TPS3780CQDBVRQ1 variant does require pullup resistors. For the TPS3779CQDBVRQ1, connecting OUT1 or OUT2 directly to a microcontroller reset pin-without any resistor-is fully compliant with its electrical specifications and recommended application practice.

Can the TPS3779CQDBVRQ1 monitor a 5-V supply rail while powered from a 3.3-V VDD?

Yes, the TPS3779CQDBVRQ1 can monitor a 5-V supply rail on SENSE1 or SENSE2 while operating from a 3.3-V VDD. Its SENSE inputs are rated for 0 V to 5.5 V independent of VDD voltage, enabling direct connection to higher-voltage rails without level-shifting circuitry. The internal comparator reference and input stage are designed for this voltage tolerance. However, the resulting threshold voltage at the SENSE pin must still fall within the device's detectable range (≥1.2 V), and the external resistor divider must be sized to limit input current to <±15 nA. This capability is explicitly confirmed in the Electrical Characteristics table and Functional Description sections of the official TPS3779-Q1 datasheet.

What is the maximum operating temperature for the TPS3779CQDBVRQ1?

The TPS3779CQDBVRQ1 is qualified for AEC-Q100 Grade 1 operation, with a maximum ambient operating temperature of +125°C. This rating is validated across all electrical parameters-including threshold accuracy, propagation delay, and quiescent current-in the full range of –40°C to +125°C. Thermal derating is not required up to this limit, and the device maintains ±1% VIT+ accuracy and <±0.4% temperature-induced deviation throughout. The SOT-23-6 package's RθJA of 193.9°C/W supports reliable operation under sustained high-temperature conditions typical in engine bay or dashboard-mounted automotive electronics. No additional heatsinking is needed for compliance.

How does the TPS3779CQDBVRQ1 differ from the TPS3780CQDBVRQ1?

The TPS3779CQDBVRQ1 and TPS3780CQDBVRQ1 share identical 10% hysteresis, threshold accuracy, and SENSE pin specifications-but differ fundamentally in output architecture: TPS3779CQDBVRQ1 uses push-pull outputs, while TPS3780CQDBVRQ1 uses open-drain outputs. This means the TPS3779CQDBVRQ1 drives both logic high (to VDD) and low (to GND) actively, requiring no pullup resistors, whereas the TPS3780CQDBVRQ1 only pulls low and needs external pullups to define the high state. Consequently, they are not pin-compatible replacements; swapping them requires modifying the output routing and adding pullup resistors. Their shared "C" suffix denotes 10% hysteresis, but output behavior dictates system-level interface design.