Texas Instruments TPS3780CDBVT

Overview

TPS3780CDBVT from Texas Instruments is a dual-channel, open-drain voltage detector IC designed for precision rail monitoring in low-power systems. It features 10% 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 (e.g., 3.3 V and 3.0 V) and asserts open-drain outputs to reset or enable inputs of MCUs, FPGAs, or LDOs.

For engineers reviewing the TPS3780CDBVT datasheet, TPS3780CDBVT pinout, TPS3780CDBVT application, or TPS3780CDBVT equivalent, this page delivers verified electrical specifications, temperature-stable threshold deviation data, SOT23-6 package layout guidance, and real-world dual-rail monitoring use cases - all grounded in TI's SBVS250 datasheet and application schematics.

Technical Context

The TPS3780CDBVT implements two independent high-accuracy comparators with internal reference trimming, enabling precise undervoltage detection on SENSE1 and SENSE2. Each channel uses fixed 10% hysteresis (VHYS = 10% × VIT+) to reject noise-induced false triggers across its full operating range.

Its open-drain outputs (OUT1/OUT2) support independent pull-up voltages up to 6.5 V - decoupled from VDD - allowing interface compatibility with diverse logic families. 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 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 TPS3780DDBVT and TPS3779CDBVT, the TPS3780CDBVT uniquely balances noise immunity (10% hysteresis), interface flexibility (open-drain + 6.5 V pull-up), and thermal stability (±1% over –40°C to 125°C), making it optimal for dual-rail systems requiring robustness against EMI and wide supply variations.

Availability

TPS3780CDBVT is available at Aetrix Electronics and suitable for power-supply sequencing, early warning detection, solid-state drive monitoring, and industrial PLC voltage supervision requiring stable component supply and long-term lifecycle support.

Supply support for TPS3780CDBVT 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 and embedded processing technologies, with decades of expertise in precision voltage monitoring and low-power system solutions.

The TPS37xx family was engineered specifically for dual-rail system supervision in space-constrained, battery-sensitive, and thermally demanding applications - delivering high accuracy, ultra-low quiescent current, and flexible output configurations in miniature packages.

FAQ

What is the hysteresis value of the TPS3780CDBVT?

The TPS3780CDBVT has a factory-set hysteresis of 10%, meaning the difference between its rising threshold (VIT+) and falling threshold (VIT–) is exactly 10% of VIT+. This value is trimmed during manufacturing and remains stable across temperature and supply voltage - confirmed in TI's SBVS250 datasheet Table 5 and Figure 3. No external components are needed to achieve this hysteresis.

Can the TPS3780CDBVT monitor voltages higher than its VDD supply?

Yes - the TPS3780CDBVT SENSE1 and SENSE2 inputs support common-mode voltages from 0 V to 6.5 V, independent of VDD (which ranges from 1.5 V to 6.5 V). This allows direct monitoring of higher rails (e.g., 5 V or 3.3 V) while powering the TPS3780CDBVT from a lower VDD (e.g., 1.8 V), provided an appropriate resistor divider scales the input within the comparator's valid range.

What is the maximum allowable pull-up voltage for the TPS3780CDBVT open-drain outputs?

The TPS3780CDBVT open-drain outputs (OUT1 and OUT2) support pull-up voltages up to 6.5 V, regardless of the VDD supply voltage. This is explicitly specified in the "Recommended Operating Conditions" table (Section 7.3) and "Absolute Maximum Ratings" (Section 7.1) of the SBVS250 datasheet - enabling interoperability with 5 V logic systems even when VDD = 1.5 V.

Does the TPS3780CDBVT require an input capacitor on the SENSE pins?

No - the TPS3780CDBVT does not require capacitors on SENSE1 or SENSE2. Its built-in 10% hysteresis inherently rejects noise, and the input bias current is only ±15 nA, minimizing divider error. TI recommends adding a 1–10 nF capacitor only in extremely noisy environments (e.g., motor-drive proximity), as noted in Section 8.3.1 of SBVS250 - not as a default requirement.

What is the startup behavior of the TPS3780CDBVT during power-on?

Upon power-on, the TPS3780CDBVT enters a 570 µs startup delay period after VDD crosses VDD(min). During this time, outputs remain undefined. After the delay, outputs respond to SENSE1/SENSE2 levels relative to VIT+/VIT–. This behavior is guaranteed across –40°C to 125°C and is documented in Section 7.6 (Timing Requirements) and Figure 1 of SBVS250.