Texas Instruments TPS3823-50DBVR

Overview

TPS3823-50DBVR from Texas Instruments is a 5-pin SOT-23 voltage supervisor IC with integrated watchdog timer, fixed 5.0V supply monitoring threshold (V_IT− = 4.49–4.64 V), 200ms reset delay, and active-low push-pull RESET output - used for reliable power-on reset and fault recovery in microcontroller-based systems.

For engineers reviewing the TPS3823-50DBVR datasheet, TPS3823-50DBVR pinout, TPS3823-50DBVR application, or TPS3823-50DBVR equivalent, key selection criteria include its 15µA typical supply current, −40°C to 85°C operating range, manual reset (MR) input support, watchdog timeout of 1.6s, and compatibility with 5V rail supervision in space-constrained embedded designs.

Technical Context

The TPS3823-50DBVR implements a fixed-threshold voltage supervision architecture using an internal resistor divider to set V_IT− at 4.55 V (nominal), with 50 mV hysteresis (V_HYS). It asserts RESET when V_DD falls below V_IT− or when the watchdog input (WDI) remains static beyond 1.6s, and holds RESET low for 200ms after V_DD recovers above V_IT− + V_HYS.

Its functional block includes a transition detector on WDI, a watchdog timer with auto-clear on falling edge, MR-triggered reset override, and push-pull output stage capable of sinking 3mA at 0.4V. No external components are required for basic operation, and the device powers up cleanly from V_DD ≥ 1.1V.

Key Specifications

Pinout & Package

TPS3823-50DBVR is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for high-density PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3823A-50DBVR and TPS3820-50DBVR, the TPS3823-50DBVR delivers the optimal balance of extended watchdog protection, industry-standard 200ms reset hold time, and commercial-temperature qualification - making it ideal for general-purpose 5V microcontroller supervision where thermal margin and fault coverage are both priorities.

Availability

TPS3823-50DBVR is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and automotive infotainment systems requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance.

Supply support for TPS3823-50DBVR 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 precision supervision and reliability-critical IC design.

The TPS382x family was engineered specifically for robust power-on reset and runtime fault detection in DSP, microcontroller, and microprocessor systems - emphasizing low power, small footprint, and zero-external-component operation.

FAQ

What is the exact reset threshold voltage for TPS3823-50DBVR?

The TPS3823-50DBVR has a negative-going input threshold voltage (V_IT−) of 4.49 V (min), 4.55 V (nom), and 4.64 V (max) across −40°C to 85°C. This fixed threshold is factory-trimmed and requires no external calibration - enabling precise 5V rail supervision without resistor networks.

Does TPS3823-50DBVR require external components to function?

No. The TPS3823-50DBVR operates autonomously with only VDD and GND connections. Its internal voltage divider sets the 5V threshold, and the push-pull RESET output needs no external pull-up. A 0.1µF ceramic bypass capacitor near VDD is recommended for noise immunity but not strictly required for basic operation.

How does the watchdog timer in TPS3823-50DBVR work?

The TPS3823-50DBVR watchdog timer times out after 1.6s (0.9–2.5s range) if the WDI pin sees no falling edge. A detected falling edge resets the timer. If WDI floats, the device generates internal pulses to prevent false timeout - ensuring reliable supervision even when WDI is unconnected or driven intermittently.

Can TPS3823-50DBVR be used with a 3.3V microcontroller?

Yes. While TPS3823-50DBVR supervises a 5V supply (V_IT− ≈ 4.55V), its RESET output is compatible with 3.3V logic: VOL ≤ 0.4V at 3mA sink, and VOH ≥ VDD – 1.5V (≥ 3.5V at VDD = 5V), allowing direct interface to 3.3V MCU reset pins via level-tolerant input or simple voltage divider if needed.

What is the purpose of the MR pin on TPS3823-50DBVR?

MR (Manual Reset) is an active-low input that forces RESET low regardless of VDD level or watchdog state. Pulling MR low initiates a reset cycle identical to a power-fail event - including the 200ms delay - enabling hardware-initiated recovery from user interface, test mode, or external fault signals without software involvement.