Texas Instruments TPS3823-25DBVT

Overview

TPS3823-25DBVT from Texas Instruments is a fixed-threshold voltage supervisor IC with integrated watchdog timer and manual reset input, designed for 2.5V supply rail monitoring in microcontroller-based systems. It provides active-low push-pull RESET output, 200ms reset delay, 1.6s watchdog timeout, 15μA typical supply current, and operates across −40°C to 85°C in a 5-pin SOT-23 package.

For engineers reviewing the TPS3823-25DBVT datasheet, TPS3823-25DBVT pinout, TPS3823-25DBVT application, or TPS3823-25DBVT equivalent, this page delivers verified specifications, validated pin functions, confirmed use cases in embedded power sequencing and fault recovery, and two technically documented alternative parts for design flexibility.

Technical Context

The TPS3823-25DBVT implements a precision voltage comparator with internal 2.25V (±2.5%) threshold (V_IT−) and 50mV hysteresis to detect undervoltage on VDD. Its watchdog timer triggers RESET if WDI fails to toggle within 1.6s, and its MR input forces immediate reset independent of VDD level.

RESET assertion begins when VDD rises above 1.1V at power-on, then remains active low until VDD exceeds V_IT− + V_HYS, after which a 200ms internal timer delays deassertion. The device requires no external components and supports direct interfacing with MSP430 and similar microcontrollers via push-pull logic-level outputs.

Key Specifications

Pinout & Package

TPS3823-25DBVT uses a 5-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, optimized for space-constrained PCB layouts and compatible with standard pick-and-place assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3823-25DBVT, TPS3820-25DBVT reduces boot delay by 87.5% for time-critical firmware, while TPS3823A-25DBVT extends thermal reliability without layout or schematic changes-both retain full functional compatibility and share the same DBV package.

Availability

TPS3823-25DBVT is available at Aetrix Electronics and suitable for industrial PLCs, portable medical sensors, automotive body electronics, and microcontroller-based edge devices requiring stable component supply and long-term production continuity.

Supply support for TPS3823-25DBVT 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 experience in high-reliability supervisory circuits.

The TPS382x product line was engineered specifically for robust power-on reset and fault detection in DSP, microcontroller, and microprocessor systems-delivering precision threshold accuracy, low quiescent current, and integrated watchdog functionality in miniature packages.

FAQ

What is the exact supply voltage threshold for TPS3823-25DBVT?

The TPS3823-25DBVT has a nominal negative-going input threshold voltage (V_IT−) of 2.25V, with a guaranteed range of 2.21V to 2.30V over −40°C to 85°C. This fixed threshold is factory-trimmed and requires no external components, making TPS3823-25DBVT ideal for precise 2.5V rail supervision in microcontroller applications.

Does TPS3823-25DBVT support active-high reset output?

No, TPS3823-25DBVT provides only an active-low push-pull RESET output. Devices with dual active-high/active-low outputs (e.g., RESET and RESET) belong to the TPS3824/TPS3825 variants. TPS3823-25DBVT's single RESET pin simplifies interface design for standard CMOS reset inputs that expect low-active assertion.

How does the watchdog timer in TPS3823-25DBVT function?

The watchdog timer in TPS3823-25DBVT times out after 1.6s if the WDI pin does not detect a falling edge. Upon timeout, it asserts the active-low RESET signal for 200ms. The timer resets on any WDI falling edge or when RESET is asserted, ensuring reliable firmware hang detection without software polling overhead in the TPS3823-25DBVT implementation.

Can TPS3823-25DBVT operate with supply voltages below 2.5V?

Yes, TPS3823-25DBVT functions across VDD = 1.1V to 5.5V, but its 2.25V supervision threshold remains valid only when VDD ≥ 2.25V. Below that, the internal comparator cannot reliably assert RESET. For sub-2.5V rails, TI recommends TPS3823-18 or TPS3823-20 variants-TPS3823-25DBVT is optimized exclusively for 2.5V system monitoring.

What is the recommended bypass capacitor for TPS3823-25DBVT?

A 0.1μF ceramic capacitor placed as close as possible to the VDD and GND pins of TPS3823-25DBVT is required to stabilize the internal reference and prevent false resets during fast VDD transients. This capacitor minimizes noise coupling into the threshold detection circuit and is explicitly specified in the TPS3823-25DBVT datasheet Section 6.5 Note (2).