Texas Instruments TPS3780ADRYT

Overview

TPS3780ADRYT from Texas Instruments is a dual-channel, open-drain voltage detector IC designed for precision rail monitoring in low-power systems. It features 1% factory-set hysteresis, ±1% VIT+ threshold accuracy over –40°C to 125°C, and 2 µA typical quiescent current. The device monitors two independent supply rails (SENSE1/SENSE2) and asserts open-drain outputs (OUT1/OUT2) for reset or enable signaling in battery-powered microcontroller applications.

For engineers reviewing the TPS3780ADRYT datasheet, TPS3780ADRYT pinout, TPS3780ADRYT application, or TPS3780ADRYT equivalent, key selection considerations include its 1% hysteresis option, open-drain output compatibility with 6.5 V pull-up rails independent of VDD, adjustable detection down to 1.2 V via external resistor dividers, and operation across 1.5–6.5 V supply range with guaranteed performance at 125°C junction temperature.

Technical Context

The TPS3780ADRYT implements two independent high-accuracy comparators with internal reference trimming-VIT+ = 1.182 V (±1%) and VIT– = 1.170 V (1% hysteresis)-enabling precise undervoltage detection with glitch immunity. Its open-drain outputs support level-shifting: OUT1/OUT2 can be pulled up to 6.5 V regardless of VDD (1.5–6.5 V), enabling interface with higher-voltage logic or shared reset buses.

Each SENSE input accepts 0–6.5 V signals and exhibits <15 nA input bias current, allowing high-impedance resistor-divider configurations. Startup delay is fixed at 570 µs after VDD crosses VDD(min), and propagation delays are 5.5 µs (rising) and 10 µs (falling), ensuring deterministic timing for system reset sequencing.

Key Specifications

Pinout & Package

TPS3780ADRYT is packaged in a 1.45 mm × 1.00 mm, 6-pin µSON (DRY) package with wettable flanks for automated optical inspection. Thermal resistance RθJA = 306.7°C/W enables operation in compact, thermally constrained layouts without forced air.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3780BDRYT, the TPS3780ADRYT provides tighter 1% hysteresis for noise-sensitive low-voltage rails, while MAX6315US29D3+ lacks dual-channel capability and open-drain interoperability-making TPS3780ADRYT the only option meeting requirements for precision, flexible, dual-rail supervision.

Availability

TPS3780ADRYT is available at Aetrix Electronics and suitable for microcontroller power sequencing, battery-powered medical sensors, industrial PLC I/O modules, and SSD power management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3780ADRYT 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 power management technologies, with decades of expertise in precision voltage monitoring and low-power system solutions.

The TPS37xx family was designed specifically for space-constrained, low-quiescent-current applications requiring dual-rail supervision with configurable thresholds and robust noise immunity-targeting portable, industrial, and automotive electronics.

FAQ

What is the exact VIT+ threshold voltage of the TPS3780ADRYT and how is it trimmed?

The TPS3780ADRYT has a factory-trimmed VIT+ threshold of 1.182 V ±1% over –40°C to +125°C. This value is laser-trimmed during production to ensure 1% accuracy without requiring external calibration. The corresponding VIT– is 1.170 V, yielding 1% hysteresis (11.8 mV). This precision enables reliable detection of 3.3 V rails (via 2.78:1 resistor divider) and 1.8 V rails (via 1.52:1 divider) in the TPS3780ADRYT.

Can the TPS3780ADRYT monitor voltages higher than its VDD supply?

Yes-the TPS3780ADRYT SENSE1 and SENSE2 inputs accept 0–6.5 V signals regardless of VDD (1.5–6.5 V). For example, with VDD = 3.3 V, the device can accurately monitor a 5 V rail using an external resistor divider. Input bias current is <15 nA, minimizing divider error. This capability is explicitly validated in the datasheet's Recommended Operating Conditions table and enables flexible multi-rail supervision in the TPS3780ADRYT.

Does the TPS3780ADRYT require external pull-up resistors on its outputs?

Yes-TPS3780ADRYT features open-drain outputs (OUT1 and OUT2), so external pull-up resistors are mandatory for proper logic-level assertion. The datasheet specifies RPU = 1.5 kΩ to 10 kΩ; typical values are 4.7 kΩ for 3.3 V logic or 10 kΩ for 5 V. Pull-ups may connect to voltages up to 6.5 V, independent of VDD-a key feature distinguishing the TPS3780ADRYT from push-pull alternatives like the TPS3779 series.

How does the TPS3780ADRYT handle power-on sequencing and startup delay?

The TPS3780ADRYT enforces a fixed 570 µs startup delay (tSD) after VDD crosses VDD(min) before outputs respond to SENSE inputs. During this period, outputs remain in high-impedance state. This delay ensures internal circuitry stabilizes before asserting reset signals-critical for synchronous release of multiple rails. The TPS3780ADRYT datasheet confirms tSD is temperature- and voltage-invariant, guaranteeing consistent behavior across operating conditions.

Is the TPS3780ADRYT pin-compatible with other devices in the TPS37xx family?

Yes-TPS3780ADRYT shares identical 6-pin µSON (DRY) package and pinout with all TPS3779/TPS3780 variants (e.g., TPS3780BDRYT, TPS3779CDRVT). Pin functions (SENSE1, GND, SENSE2, OUT2, OUT1, VDD) are identical across the family. This allows direct substitution between hysteresis options (0.5%, 1%, 5%, 10%) and output types (open-drain TPS3780 vs. push-pull TPS3779) without PCB changes-provided the TPS3780ADRYT's 1% hysteresis meets design requirements.