Texas Instruments TPS3780BDBVT

Overview

TPS3780BDBVT from Texas Instruments is a dual-channel, open-drain voltage detector IC designed for precision rail monitoring in low-power systems. It features 5% hysteresis, ±1% VIT+ threshold accuracy over –40°C to 125°C, and 2 µA typical quiescent current. The device monitors two independent supply rails (e.g., 3.3 V and 1.8 V) and asserts open-drain outputs to reset or enable inputs of MCUs, FPGAs, or LDOs.

For engineers reviewing the TPS3780BDBVT datasheet, TPS3780BDBVT pinout, TPS3780BDBVT application, or TPS3780BDBVT equivalent, this page delivers verified electrical specs, package mapping, functional context for power sequencing and early-warning detection, and validated alternative options for dual-rail supervision.

Technical Context

The TPS3780BDBVT implements two independent high-accuracy comparators with internal reference trimming, each configured with fixed 5% hysteresis to reject noise-induced false triggering. Its SENSE1/SENSE2 inputs accept voltages up to 6.5 V regardless of VDD (1.5–6.5 V), enabling flexible rail monitoring across disparate voltage domains.

Both outputs are open-drain with 6.5 V absolute maximum pull-up capability, supporting level-shifting to logic families independent of VDD. Startup delay is fixed at 570 µs after VDD crosses VDD(min), and propagation delays are 5.5 µs (rising) and 10 µs (falling) under nominal conditions.

Key Specifications

Pinout & Package

SOT23-6 package (2.92 mm × 1.30 mm), surface-mount, thermally enhanced for compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3780BDBVT, TPS3780CDBVT offers greater noise margin at the cost of reduced threshold resolution, while TPS3779BDBVT reduces BOM count but sacrifices voltage-level flexibility-making TPS3780BDBVT optimal for mixed-voltage, noise-sensitive dual-rail supervision.

Availability

TPS3780BDBVT is available at Aetrix Electronics and suitable for microcontroller power sequencing, early-warning voltage monitoring, and industrial sensor node supervision requiring stable component supply across extended temperature ranges.

Supply support for TPS3780BDBVT 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 with emphasis on reliability, precision, and low-power innovation.

The TPS37xx family is engineered for high-accuracy, ultra-low-power voltage supervision in space-constrained and thermally demanding applications-from portable medical devices to automotive ECUs and industrial controllers.

FAQ

What is the hysteresis value of the TPS3780BDBVT?

The TPS3780BDBVT has a factory-set hysteresis of 5%, meaning the difference between its rising threshold (VIT+) and falling threshold (VIT–) is exactly 5% of VIT+. This value is trimmed during production and remains stable across –40°C to +125°C, ensuring consistent noise rejection without external components. The 5% hysteresis is specified in the Device Comparison Table of the SBVS250 datasheet and applies exclusively to the 'B' variant of the TPS3780BDBVT.

Can the TPS3780BDBVT monitor voltages higher than its VDD supply?

Yes, the TPS3780BDBVT can monitor input voltages up to 6.5 V on SENSE1 and SENSE2 regardless of VDD, which operates from 1.5 V to 6.5 V. This allows rail monitoring of higher-voltage domains (e.g., 5 V or 6 V) while powering the IC from a lower auxiliary rail (e.g., 3.3 V). The input stage is designed for rail-to-rail operation and is explicitly rated for 0–6.5 V per the Absolute Maximum Ratings table in the datasheet.

What is the maximum allowable pull-up voltage for the open-drain outputs of the TPS3780BDBVT?

The open-drain outputs (OUT1 and OUT2) of the TPS3780BDBVT support a maximum pull-up voltage of 6.5 V, independent of the VDD supply voltage. This is confirmed in the Absolute Maximum Ratings table (OUT1/OUT2 voltage limit = 7 V, with recommended max 6.5 V) and the Pin Functions description, which states "The open-drain device (TPS3780) can be pulled up to 6.5 V independent of VDD." This enables interoperability with 5 V or 6 V logic families even when VDD is 1.8 V.

Does the TPS3780BDBVT require an external capacitor on the VDD pin?

A 0.1 µF ceramic capacitor is required on the VDD pin of the TPS3780BDBVT when VDD is less than 1.5 V, and strongly recommended for all operating conditions per TI's analog design best practices. The datasheet specifies this in Section 6 (Pin Functions) and Section 10 (Power-Supply Recommendations), noting that the capacitor must be placed close to the VDD pin to suppress supply noise and prevent false triggering-especially critical given the device's high sensitivity and low quiescent current.

How does the TPS3780BDBVT behave during power-up?

During power-up, the TPS3780BDBVT enters a 570 µs startup delay period after VDD crosses VDD(min) (~1.5 V), as defined in Section 7.6 (Timing Requirements). During this time, outputs remain in high-impedance state and do not respond to SENSE transitions. After 570 µs, outputs begin tracking SENSE inputs normally. If VDD drops below V(POR) (0.8 V), outputs become undefined-this behavior is documented in Section 8.4.2 (Power-On Reset) and Electrical Characteristics table.