Texas Instruments TPS3823-30DBVT

Overview

TPS3823-30DBVT 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. 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 TPS3823-30DBVT datasheet, TPS3823-30DBVT pinout, TPS3823-30DBVT application, or TPS3823-30DBVT equivalent, key selection criteria include its 3.0V threshold accuracy (±2.7% over temperature), watchdog timer behavior under WDI floating conditions, MR-driven reset timing, and compatibility with 5-pin SOT-23 PCB layouts.

Technical Context

The TPS3823-30DBVT implements a precision bandgap reference and comparator-based supervision architecture with internal hysteresis (50mV) to reject supply noise. Its watchdog timer requires periodic falling-edge transitions on WDI to prevent timeout; if left unconnected, it generates internal pulses to inhibit spurious resets.

Reset assertion occurs when VDD falls below 2.59V (min) or rises above 1.1V during power-up; the 200ms delay begins only after VDD exceeds VIT− + VHYS. The device uses no external components and supports direct interfacing with microcontroller reset inputs via its push-pull RESET output.

Key Specifications

Pinout & Package

TPS3823-30DBVT is housed in a 5-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, with standard lead pitch and thermal performance suitable for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3823A-30DBVT, the TPS3823-30DBVT offers identical functionality at lower cost but lacks extended temperature qualification; compared with TPS3828-30DBVT, it simplifies design by eliminating external pull-up components while maintaining full watchdog and manual reset capability.

Availability

TPS3823-30DBVT is available at Aetrix Electronics and suitable for industrial control systems, battery-powered IoT nodes, network infrastructure equipment, and microcontroller-based embedded designs requiring stable component supply and long-term lifecycle support.

Supply support for TPS3823-30DBVT 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 designed specifically for power-supply monitoring and system-level reset generation in DSP, microcontroller, and microprocessor applications - prioritizing low quiescent current, fixed-threshold accuracy, and integrated watchdog functionality.

FAQ

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

The TPS3823-30DBVT has a negative-going input threshold voltage (VIT−) of 2.59V (min), 2.63V (typ), and 2.69V (max) across −40°C to 85°C. This 3.0V nominal threshold is factory-trimmed using an internal voltage divider and does not require external calibration. The device asserts RESET when VDD falls below this value and releases it only after VDD rises above VIT− + 50mV hysteresis.

Does TPS3823-30DBVT require external components for basic operation?

No, the TPS3823-30DBVT requires no external components for core supervision functionality. Its fixed 3.0V threshold, 200ms reset delay, and 1.6s watchdog timer are fully internal. A 0.1μF ceramic bypass capacitor on VDD is recommended for noise immunity, but pull-up resistors, timing capacitors, or voltage dividers are unnecessary - unlike adjustable supervisors.

How does the watchdog timer behave if the WDI pin is left unconnected on TPS3823-30DBVT?

When WDI is left floating, the TPS3823-30DBVT internally generates periodic pulses to prevent watchdog timeout - ensuring RESET remains inactive. This fail-safe behavior avoids unintended system resets in designs where WDI is unused. To disable watchdog entirely, tie WDI to a fixed logic high or low level; do not rely on floating state in safety-critical applications.

Can TPS3823-30DBVT drive a microcontroller reset pin directly?

Yes, the TPS3823-30DBVT features a push-pull active-low RESET output capable of sinking up to 3mA while asserted. It interfaces directly with standard microcontroller reset inputs (e.g., ARM, MSP430, PIC) without requiring external pull-up resistors or level shifters. The output voltage remains below 0.4V at 1.2mA sink current, satisfying TTL and CMOS reset voltage thresholds.

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

The MR (manual reset) pin on TPS3823-30DBVT is an active-low input that forces RESET assertion regardless of VDD level or watchdog status. Pulling MR low immediately triggers reset for the full 200ms delay period. An internal 90kΩ pull-up resistor allows MR to be left unconnected or tied to VDD when unused - eliminating need for external biasing components.