Texas Instruments TPS389020DSET

Overview

TPS389020DSET from Texas Instruments is a precision voltage supervisor IC designed for system power-rail monitoring and reset generation in space-constrained, low-power applications. It features a fixed 2.0 V negative threshold (VITN = 1.90 V), ±1% accuracy over –40°C to +125°C, 2.1 µA typical quiescent current, open-drain RESET output, and user-programmable delay (40 µs to 30 s via external CT capacitor). It is used to ensure reliable power-on reset for microcontrollers operating from 2.0 V rails.

For engineers reviewing the TPS389020DSET datasheet, TPS389020DSET pinout, TPS389020DSET application, or TPS389020DSET equivalent, key selection criteria include its 1.90 V / 1.911 V threshold pair with 0.575% hysteresis, WSON-6 package footprint (1.5 mm × 1.5 mm), MR input support for manual reset assertion, and guaranteed operation down to 1.5 V supply voltage.

Technical Context

The TPS389020DSET implements a precision bandgap reference and comparator architecture to achieve ±1% threshold accuracy across temperature. Its internal CT pin current source (1.15 µA nominal) charges an external capacitor to set the rising-edge RESET delay time, with built-in compensation for leakage effects.

It operates in three functional states: undefined below 0.8 V (VPOR), asserted during undervoltage lockout (0.8–1.5 V), and fully active above 1.5 V. The SENSE input accepts voltages up to 5.5 V independent of VDD, enabling monitoring of higher rails while powered from lower supplies.

Key Specifications

Pinout & Package

TPS389020DSET is housed in a 1.5-mm × 1.5-mm, 6-pin WSON (DSE) package with wettable flanks, optimized for automated optical inspection and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with TPS389018DSET, TPS389020DSET provides exact 2.0 V rail compatibility without external components; compared with MAX6326UT20+T, it delivers 74% lower quiescent current, MR functionality, and field-programmable delay-critical for adaptive power sequencing in modern embedded systems.

Availability

TPS389020DSET is available at Aetrix Electronics and suitable for microcontroller power sequencing, FPGA configuration monitoring, battery-powered edge sensor nodes, and industrial PLC I/O modules requiring stable component supply and long-term lifecycle support.

Supply support for TPS389020DSET 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The TPS3890 family was engineered specifically for ultra-low-power, high-accuracy voltage supervision in battery-critical and thermally demanding applications-emphasizing precision thresholds, minimal IQ, and flexible timing without external timing resistors.

FAQ

What is the exact negative threshold voltage (VITN) of the TPS389020DSET?

The TPS389020DSET has a factory-trimmed negative threshold voltage (VITN) of 1.90 V, with a maximum deviation of ±1% across –40°C to +125°C. This value is confirmed in the Device Comparison Table of the official SLVSD65A datasheet and is specific to the TPS389020 variant-not adjustable and not shared with other members of the TPS3890 family.

Does the TPS389020DSET require an external pullup resistor on the RESET pin?

Yes, the TPS389020DSET features an open-drain RESET output and requires an external pullup resistor (10 kΩ to 1 MΩ) connected to a valid logic rail (≤5.5 V). The resistor value must be selected based on VOL specification (≤0.25 V at 0.4 mA), capacitive load, and leakage current (≤250 nA) to ensure clean high-level signaling in the target system.

Can the TPS389020DSET monitor a voltage rail higher than its VDD supply?

Yes, the TPS389020DSET SENSE input supports voltages from 0 V to 5.5 V regardless of VDD, which can be as low as 1.5 V. For example, it can supervise a 3.3 V I/O rail while powered from a 1.8 V bias supply-enabling mixed-voltage system monitoring without level shifters or additional regulators.

What is the minimum CT capacitor value needed to achieve a 100-ms RESET delay with the TPS389020DSET?

Using the nominal CT charging current (1.15 µA) and comparator threshold (1.23 V), a 100-ms delay requires approximately 85.5 nF. Accounting for worst-case ICT (1.35 µA) and VCT (1.17 V) over temperature, a 100 nF ±10% X7R ceramic capacitor ensures robust 100-ms performance across –40°C to +125°C without exceeding the 22 µF maximum rating.

Is the TPS389020DSET pin-compatible with other devices in the TPS3890 family?

Yes, all TPS3890 variants-including TPS389020DSET, TPS389018DSET, and TPS389025DSET-share identical 6-pin WSON (DSE) packaging, pinout, and electrical interface. This allows direct substitution within the same footprint when changing threshold requirements, provided the application's voltage rail matches the variant's fixed VITN.