Texas Instruments TPS3818G25DRVT

Overview

TPS3818G25DRVT from Texas Instruments is a low-quiescent-current, fixed-threshold supervisory IC that monitors 2.5V system rails and asserts an open-drain RESET signal when the SENSE voltage drops below 2.33V (±0.5% accuracy). It supports user-programmable reset delay from 1.25ms to 10s via external capacitor on CT pin, operates from –40°C to +125°C, and draws only 2.4µA typical supply current - ideal for battery-powered microcontroller power-up sequencing in portable electronics.

For engineers reviewing the TPS3818G25DRVT datasheet, TPS3818G25DRVT pinout, TPS3818G25DRVT application, or TPS3818G25DRVT equivalent, key selection criteria include its 2.33V threshold accuracy, 2.4µA quiescent current, 6-pin WSON (DRV) package with exposed thermal pad, programmable delay architecture using CT pin charging current (220nA), and compatibility with 0.4V–5.0V monitored rails.

Technical Context

The TPS3818G25DRVT implements a precision bandgap reference and comparator to achieve ±0.5% threshold accuracy for V_IT ≤ 3.3V. Its internal 220nA CT pin charging current enables accurate delay timing when paired with an external capacitor ≥100pF, with combined delay accuracy of ±15%.

It features an open-drain RESET output with 0.4V max VOL at 1mA load, internal 90kΩ MR pull-up resistor, hysteresis of 1.0–2.0% V_IT, and operates across 1.7V–6.5V VDD range. The device de-asserts RESET only after both SENSE > V_IT + V_HYS and MR returns high, followed by the full programmed delay period.

Key Specifications

Pinout & Package

TPS3818G25DRVT is housed in a 2mm × 2mm, 6-pin WSON (DRV) package with exposed thermal pad (PowerPAD™), optimized for thermal dissipation and board space efficiency in compact designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supervisory circuit applications.

Compared with TPS3818G25DBVR and TPS3808G25DBVR, the TPS3818G25DRVT delivers superior thermal management via PowerPAD™, tighter threshold accuracy, lower quiescent current, and flexible capacitor-based delay tuning - making it optimal for next-generation space- and power-sensitive designs.

Availability

TPS3818G25DRVT is available at Aetrix Electronics and suitable for microcontroller power-up sequencing, FPGA configuration monitoring, battery-powered IoT sensor nodes, industrial PLC digital input modules, and portable medical devices requiring stable component supply across extended temperature ranges.

Supply support for TPS3818G25DRVT 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 specializing in analog, embedded processing, and power management technologies, with leadership in high-reliability industrial and automotive-grade components.

The TPS3818 family is designed for precision power-supply monitoring in resource-constrained systems, emphasizing ultra-low quiescent current, programmable timing, and robust operation across –40°C to +125°C junction temperatures.

FAQ

What is the exact threshold voltage and accuracy of the TPS3818G25DRVT?

The TPS3818G25DRVT has a nominal threshold voltage of 2.33V with ±0.5% accuracy over –40°C to +125°C for V_IT ≤ 3.3V. This specification is guaranteed in production testing and reflects the actual voltage at which the SENSE input triggers RESET assertion under defined conditions.

How is the reset delay time configured on the TPS3818G25DRVT?

The TPS3818G25DRVT uses its CT pin to configure reset delay: connecting CT to GND via a ≥100pF capacitor sets delay from 1.25ms to 10s; leaving CT open yields 20ms; connecting CT to VDD via 40kΩ–200kΩ resistor gives 300ms. The internal 220nA current source charges the capacitor to 1.23V to determine timing.

Does the TPS3818G25DRVT require an external pull-up resistor on the RESET pin?

Yes, the TPS3818G25DRVT has an open-drain RESET output and requires an external pull-up resistor between RESET and the target logic supply (e.g., 3.3V or 5V). TI recommends values from 10kΩ to 1MΩ; typical use is 100kΩ for noise immunity and fast rise time.

What package type and thermal considerations apply to the TPS3818G25DRVT?

The TPS3818G25DRVT uses a 2mm × 2mm WSON-6 (DRV) package with exposed thermal pad (Pin 7). This pad must be soldered to a PCB ground plane to ensure proper thermal dissipation and mechanical reliability. Thermal resistance θ_JA is 290°C/W with standard layout.

Can the TPS3818G25DRVT monitor voltages other than 2.5V?

No - the TPS3818G25DRVT is factory-trimmed for a fixed 2.33V threshold (corresponding to 2.5V nominal rail). It cannot monitor arbitrary voltages; for adjustable thresholds, TI offers the TPS3818G01 variant, which supports user-defined thresholds down to 0.405V using external resistors.