Texas Instruments TPS3825-50DBVT

Overview

TPS3825-50DBVT from Texas Instruments is a 5-pin SOT-23 voltage supervisor IC with active-low and active-high reset outputs, 4.55 V negative-going threshold (V_IT−), 200 ms reset delay, watchdog timer input (WDI), and manual reset (MR) pin. It monitors 5 V supply rails in microcontroller-based systems to ensure reliable power-on initialization and fault recovery.

For engineers reviewing the TPS3825-50DBVT datasheet, TPS3825-50DBVT pinout, TPS3825-50DBVT application, or TPS3825-50DBVT equivalent, key selection criteria include its dual-reset output logic, fixed 4.55 V supervision threshold, 15 µA typical supply current, −40°C to 85°C operating range, and compatibility with noisy 5 V rail environments requiring hysteresis and watchdog supervision.

Technical Context

The TPS3825-50DBVT implements a precision bandgap-based voltage reference and comparator to detect V_DD crossing its 4.55 V threshold with 50 mV hysteresis. Its internal 200 ms delay timer ensures sufficient system reset hold time after V_DD exceeds V_IT− + V_HYS, while the WDI input accepts transitions to prevent timeout-induced resets.

It supports dual-output logic: RESET (active-low push-pull) and RESET (active-high push-pull), enabling direct interface with both legacy and modern processors requiring complementary reset signaling. The MR pin provides asynchronous reset assertion independent of V_DD level or watchdog state.

Key Specifications

Pinout & Package

TPS3825-50DBVT uses a 5-pin SOT-23 (DBV) package with 2.90 mm × 1.60 mm body size and standard lead pitch. Pin 1 is RESET (active-low), Pin 2 is GND, Pin 3 is MR (manual reset input), Pin 4 is RESET (active-high), and Pin 5 is VDD (supply input).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3824-50DBVT and TPS3823-50DBVT, the TPS3825-50DBVT uniquely delivers both reset polarities *and* manual reset in a single 5-pin SOT-23, eliminating component count trade-offs in space-constrained 5 V microcontroller designs requiring full reset flexibility.

Availability

TPS3825-50DBVT is available at Aetrix Electronics and suitable for industrial PLC modules, battery-backed smart meters, and 5 V FPGA configuration circuits requiring stable component supply and long-term production continuity.

Supply support for TPS3825-50DBVT 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 expertise in power management and system supervision ICs.

The TPS382x product line was designed specifically for robust, low-component-count voltage monitoring in DSP, microcontroller, and microprocessor systems-emphasizing precision thresholds, integrated watchdogs, and flexible reset signaling.

FAQ

What is the exact negative-going threshold voltage (V_IT−) for TPS3825-50DBVT?

The TPS3825-50DBVT has a guaranteed negative-going input threshold voltage (V_IT−) of 4.49 V (min), 4.55 V (typ), and 4.64 V (max) over −40°C to 85°C. This 4.55 V nominal value is factory-trimmed to supervise standard 5 V supplies with ±1.5% accuracy, and hysteresis of 50 mV prevents oscillation near the trip point.

Does TPS3825-50DBVT support both active-low and active-high reset outputs simultaneously?

Yes, the TPS3825-50DBVT provides two independent reset outputs: Pin 1 (RESET) is active-low push-pull, and Pin 4 (RESET) is active-high push-pull. Both outputs assert/deassert synchronously during VDD supervision events or WDI timeout, enabling direct interface with processors requiring either logic polarity without external inversion.

What is the watchdog timeout period for TPS3825-50DBVT, and how is it triggered?

The TPS3825-50DBVT features a 1.6 s watchdog timeout (t_tout). It is triggered when the WDI input remains static (high or low) beyond this interval. A falling edge on WDI clears the timer; no external components are needed. If WDI is left floating, the device internally toggles it to prevent spurious resets.

Can the manual reset (MR) pin of TPS3825-50DBVT be left unconnected?

Yes, the MR pin of TPS3825-50DBVT has an internal 90 kΩ pullup resistor to VDD. Leaving it unconnected defaults it to high (inactive), allowing normal VDD-supervision operation. To assert reset, drive MR low externally; no external pullup is required unless open-drain driving is used.

What package type and thermal characteristics does TPS3825-50DBVT use?

TPS3825-50DBVT uses the 5-pin SOT-23 (DBV) package with 2.90 mm × 1.60 mm footprint. Its junction-to-ambient thermal resistance (R_θJA) is 185°C/W, junction-to-board (R_θJB) is 52.4°C/W, and it is rated for −40°C to 85°C operation - suitable for compact, convection-cooled industrial PCB layouts.