Texas Instruments TPS3823-25DBVR

Overview

TPS3823-25DBVR from Texas Instruments is a fixed-threshold voltage supervisor IC with integrated watchdog timer and manual reset input, designed for reliable power-on reset generation and supply monitoring in 2.5V systems. It features a 2.25V negative-going threshold (V_IT−), 200ms reset delay, 1.6s watchdog timeout, active-low push-pull RESET output, and consumes only 15μA typical supply current. It is used in microcontroller-based embedded systems requiring robust brownout detection and system-level fault recovery.

For engineers reviewing the TPS3823-25DBVR datasheet, TPS3823-25DBVR pinout, TPS3823-25DBVR application, or TPS3823-25DBVR equivalent, key selection criteria include its 2.25V supervision threshold, 1.6s watchdog time-out, SOT-23-5 package compatibility, −40°C to 85°C operating range, and support for manual reset assertion independent of supply voltage.

Technical Context

The TPS3823-25DBVR implements a precision bandgap-based voltage reference and comparator architecture to monitor VDD against a fixed internal threshold (2.25V ±2.5%). Its reset logic includes an internal monostable timer that enforces a 200ms minimum delay before deasserting RESET after VDD rises above V_IT− + V_HYS (2.30V).

The watchdog function relies on edge-triggered timing: a falling edge on WDI resets the 1.6s timeout counter, while absence of transitions beyond that interval forces RESET assertion for the full 200ms delay period. The device operates without external components and supports MR-driven reset initiation at any VDD ≥1.1V.

Key Specifications

Pinout & Package

TPS3823-25DBVR is housed in a 5-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3823-25DBVR, TPS3823-25DBVT offers identical performance in smaller packaging for development use, while TPS3820-25DBVR trades longer reset delay for faster system startup-making it appropriate only where timing budgets preclude 200ms hold time.

Availability

TPS3823-25DBVR is available at Aetrix Electronics and suitable for industrial control systems, portable medical devices, and wireless communication modules requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TPS3823-25DBVR 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 and embedded processing technologies, with decades of experience in power management and system supervision ICs.

The TPS382x product line was engineered specifically for cost-sensitive, space-constrained embedded systems needing reliable, no-component-required voltage monitoring and watchdog protection for 2.5V–5V rails.

FAQ

What is the exact reset threshold voltage for TPS3823-25DBVR?

The TPS3823-25DBVR has a nominal negative-going input threshold voltage (V_IT−) of 2.25V, with a guaranteed range of 2.21V (min) to 2.30V (max) over −40°C to +85°C. This threshold is factory-trimmed and does not require external calibration or adjustment. The device uses an internal voltage divider to set this fixed point, making it suitable for precise 2.5V rail supervision without external components.

Does TPS3823-25DBVR support both power-on reset and brownout detection?

Yes, TPS3823-25DBVR supports both functions. It asserts RESET when VDD rises above 1.1V during power-on, then continuously monitors VDD against its 2.25V threshold. If VDD drops below 2.21V (minimum V_IT−), RESET is reasserted-providing full brownout detection. The 50mV hysteresis prevents chatter during marginal supply conditions, and the 200ms delay ensures stable release after recovery.

Can the watchdog timer in TPS3823-25DBVR be disabled?

Yes, the watchdog timer in TPS3823-25DBVR can be effectively disabled by leaving the WDI pin unconnected. In that state, the device internally generates periodic pulses to prevent timeout assertion. For applications requiring guaranteed disable, TI recommends connecting WDI to GND via a 1kΩ resistor to ensure a defined low state and eliminate any ambiguity in watchdog behavior.

Is TPS3823-25DBVR pin-compatible with other TPS382x variants?

TPS3823-25DBVR shares the same 5-pin SOT-23 (DBV) footprint and pinout with all TPS382x family members-including TPS3820, TPS3824, and TPS3825-enabling direct PCB layout reuse. However, functional differences exist: TPS3824/5 offer active-high RESET, TPS3828 uses open-drain output, and TPS3820 has 25ms delay. Electrical compatibility must be verified per application requirements.

What is the maximum supply voltage rating for TPS3823-25DBVR?

The absolute maximum supply voltage (VDD) for TPS3823-25DBVR is 6V, but the recommended operating range is 1.1V to 5.5V. Within this range, the device accurately supervises 2.5V rails and remains fully functional. Exceeding 5.5V risks violating recommended conditions and may impact long-term reliability, even if within absolute maximum limits.