Texas Instruments TPS389033DSER

Overview

TPS389033DSER from Texas Instruments is a precision voltage supervisor IC designed to monitor 3.3-V system rails and assert an open-drain RESET signal when the SENSE input falls below 3.17 V (VITN) or the MR pin is driven low. It delivers 1% threshold accuracy over –40°C to +125°C, 2.1 µA quiescent current, and user-programmable reset delay from 40 µs to 30 s via external CT capacitor - enabling reliable power-on reset in microcontroller, FPGA, and SSD applications.

For engineers reviewing the TPS389033DSER datasheet, TPS389033DSER pinout, TPS389033DSER application, or TPS389033DSER equivalent, key selection criteria include its fixed 3.3-V monitoring threshold, WSON-6 package footprint, open-drain RESET compatibility with 5.5-V pullup rails, and guaranteed glitch immunity up to 20 µs at 10% overdrive - critical for noise-prone industrial and automotive power-rail supervision.

Technical Context

The TPS389033DSER implements a precision bandgap reference and comparator with built-in hysteresis (0.325–0.825%) to ensure clean, bounce-free RESET assertion/deassertion. Its CT pin uses a 1.15 µA precision current source charging a user-supplied capacitor to set the rising-edge reset delay time, with internal 1.23-V comparator threshold and 200-Ω pulldown resistor for discharge.

Operation is governed by dual thresholds: VITN = 3.17 V (negative trip) and VITP = 3.189 V (positive release), yielding 0.575% typical hysteresis. The SENSE input accepts voltages up to 5.5 V independent of VDD (1.5–5.5 V), and MR supports logic-level reset initiation with 100 ns glitch immunity - enabling robust multi-rail coordination without additional timing components.

Key Specifications

Pinout & Package

TPS389033DSER is housed in a 1.5-mm × 1.5-mm, 6-pin WSON package with wettable flanks for automated optical inspection. Thermal resistance R_θJA is 321.3°C/W, supporting operation without heatsinking in ambient temperatures up to +85°C at full load.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS389030DSER and MAX6326UT33D3+, the TPS389033DSER uniquely combines factory-trimmed 3.3-V accuracy, user-configurable delay, and MR input in a thermally efficient 1.5-mm WSON - making it optimal for compact, multi-rail, and automotive-grade systems where timing precision and reset coordination are critical.

Availability

TPS389033DSER is available at Aetrix Electronics and suitable for microcontroller power sequencing, FPGA configuration monitoring, solid-state drive power management, industrial PLC I/O supervision, and automotive body control modules requiring stable component supply and long-term lifecycle support.

Supply support for TPS389033DSER 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 high-reliability supervisory circuits.

The TPS3890 family was engineered specifically for low-power, high-accuracy system supervision in space- and energy-constrained applications - targeting microcontrollers, FPGAs, SSDs, and industrial control systems demanding ±1% threshold stability across extended temperature ranges.

FAQ

What is the exact threshold voltage monitored by the TPS389033DSER?

The TPS389033DSER monitors a nominal 3.3-V supply with a negative threshold voltage (VITN) of 3.17 V and positive threshold (VITP) of 3.189 V. These values are factory-trimmed and guaranteed within ±1% over –40°C to +125°C, ensuring reliable detection of 3.3-V rail undervoltage conditions per JEDEC JESD8-12 standards.

How is the reset delay time programmed on the TPS389033DSER?

The reset delay time on the TPS389033DSER is set by connecting an external capacitor between the CT pin and ground. Using the formula t_PD(r) (sec) = C_CT (µF) × 1.07 + 25 µs, designers can achieve delays from 40 µs (no capacitor) to 30 s (22 µF). A 100-nF capacitor yields ~110 µs delay, validated across temperature and process corners.

Can the TPS389033DSER supervise voltages other than 3.3 V?

No - the TPS389033DSER is a fixed-threshold device calibrated exclusively for 3.3-V rails (VITN = 3.17 V). For adjustable thresholds, TI offers the TPS389001 variant; for other fixed rails, select TPS389012 (1.2 V), TPS389018 (1.8 V), or TPS389025 (2.5 V). Using TPS389033DSER on non-3.3-V rails violates its specified operating conditions.

What is the maximum allowable voltage on the SENSE pin of the TPS389033DSER?

The SENSE pin of the TPS389033DSER supports input voltages from 0 V to 5.5 V - independent of the VDD supply voltage (1.5–5.5 V). This allows direct monitoring of higher-voltage rails (e.g., 5-V I/O) while powered from a lower VDD, provided the absolute maximum rating of 7.0 V is never exceeded, as specified in Section 7.1 of the datasheet.

Does the TPS389033DSER require a pullup resistor on the RESET pin?

Yes - the TPS389033DSER features an open-drain RESET output that requires an external pullup resistor (10 kΩ to 1 MΩ) to the desired logic-high voltage (up to 5.5 V). Without this resistor, RESET cannot transition high, preventing proper system initialization. TI recommends 100 kΩ for general-purpose use to balance speed and current consumption.