Texas Instruments TPS3823-30DBVTG4

Overview

TPS3823-30DBVTG4 from Texas Instruments is a fixed-threshold voltage supervisor IC with integrated watchdog timer, active-low push-pull reset output, manual reset input, and 3.0V supply monitoring capability. It delivers 200ms reset delay, 1.6s watchdog timeout, 15μA typical supply current, and operates across −40°C to 85°C - used for reliable power-on initialization and fault recovery in microcontroller-based embedded systems.

For engineers reviewing the TPS3823-30DBVTG4 datasheet, TPS3823-30DBVTG4 pinout, TPS3823-30DBVTG4 application, or TPS3823-30DBVTG4 equivalent, key selection criteria include its 3.0V threshold accuracy (±2.6%), watchdog time-out stability over temperature, SOT-23-5 package footprint compatibility, and MR/WDI timing constraints for system-level reset coordination.

Technical Context

The TPS3823-30DBVTG4 implements a precision bandgap reference and comparator-based supervision architecture with internal hysteresis (50mV) to reject supply noise. Its reset assertion logic triggers when VDD falls below 2.59V (min) and releases only after VDD exceeds 2.69V (max) plus hysteresis, ensuring clean release timing.

Watchdog functionality relies on edge-triggered WDI input detection: a falling edge resets the 1.6s timeout counter, while absence of transitions beyond timeout forces RESET assertion for 200ms. Manual reset (MR) overrides both VDD and watchdog states, forcing immediate active-low reset until MR returns high and delay expires.

Key Specifications

Pinout & Package

TPS3823-30DBVTG4 uses a 5-pin SOT-23 (DBV) package with 2.90mm × 1.60mm body size and standard lead pitch. Pin 1 is RESET (output), Pin 2 is GND, Pin 3 is MR (input), Pin 4 is WDI (input), and Pin 5 is VDD (power input).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3823-30DBVTG4, TPS3823-33DBVT shifts threshold upward for 3.3V rails while preserving all timing and interface behavior, whereas TPS3820-30DBVT trades watchdog duration and reset delay for faster response - making each suitable for distinct power sequencing priorities.

Availability

TPS3823-30DBVTG4 is available at Aetrix Electronics and suitable for industrial automation, battery-powered IoT endpoints, and wireless infrastructure requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TPS3823-30DBVTG4 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 and embedded processing solutions with emphasis on reliability, precision, and energy efficiency.

The TPS382x product line was engineered specifically for robust power-supply monitoring and system-level fault recovery in DSP, microcontroller, and microprocessor applications - prioritizing low quiescent current, tight threshold accuracy, and integrated watchdog functionality.

FAQ

What is the exact supply voltage threshold for TPS3823-30DBVTG4?

The TPS3823-30DBVTG4 has a nominal negative-going input threshold voltage (VIT–) of 2.63V, with a guaranteed range of 2.59V to 2.69V across −40°C to 85°C. This threshold is factory-trimmed and fixed - no external components are needed to set or adjust it. The device asserts RESET when VDD drops below this value and releases only after VDD rises above VIT– + VHYS (2.63V + 50mV).

Does TPS3823-30DBVTG4 support active-high reset output?

No, TPS3823-30DBVTG4 provides only an active-low push-pull RESET output. Active-high reset is available only on TPS3824 and TPS3825 variants. The TPS3823-30DBVTG4 RESET pin drives low during reset and actively pulls high when released - eliminating need for external pull-up resistors.

How does the watchdog timer in TPS3823-30DBVTG4 operate?

The TPS3823-30DBVTG4 watchdog timer requires a falling edge on the WDI pin at least once every 1.6s (nominal). If no edge occurs within that window, RESET asserts for 200ms. The timer resets on each valid WDI falling edge and also clears automatically when RESET is asserted. WDI must be driven - floating or high-impedance states cause internal pulsing to prevent spurious timeouts.

Can TPS3823-30DBVTG4 be used with a 2.8V supply rail?

Yes, TPS3823-30DBVTG4 operates from 1.1V to 5.5V and monitors VDD relative to its internal 2.63V threshold. A 2.8V rail remains above threshold under normal conditions, allowing supervision. However, if the rail sags below 2.59V due to load transients or brownout, RESET activates - making it suitable for margin testing and undervoltage protection on near-threshold rails.

What is the function of the MR pin on TPS3823-30DBVTG4?

The MR (manual reset) pin on TPS3823-30DBVTG4 is an asynchronous active-low input that forces RESET assertion regardless of VDD level or watchdog state. When pulled low, RESET goes active immediately and remains low for the full 200ms delay after MR returns high. If unused, MR should be tied to VDD via its internal 90kΩ pullup - no external resistor required.