Texas Instruments TPS3825-50DBVR

Overview

TPS3825-50DBVR 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) capability. It monitors 5 V supply rails in microcontroller-based systems, ensuring reliable power-on initialization and fault recovery in industrial controllers and portable equipment.

For engineers reviewing the TPS3825-50DBVR datasheet, TPS3825-50DBVR pinout, TPS3825-50DBVR application, or TPS3825-50DBVR equivalent, key selection criteria include its dual-reset output logic, fixed 4.55 V supervision threshold, 200 ms delay timing, WDI-driven watchdog timeout, and MR-triggered reset assertion - all in a space-constrained 2.90 mm × 1.60 mm package.

Technical Context

The TPS3825-50DBVR implements a fixed-threshold supervision architecture using an internal voltage divider to set V_IT− = 4.55 V (typical) with 50 mV hysteresis. Its dual-output stage delivers both active-low RESET and active-high RESET signals via push-pull drivers, enabling direct interface with bidirectional microcontroller reset pins without external pull-ups.

Watchdog functionality is triggered by falling edges on WDI, with timeout of 1.6 s (typical); manual reset is asserted by pulling MR low, holding RESET active for the full 200 ms delay after MR release. The device operates across −40°C to 85°C with 15 µA typical supply current and requires no external components for basic operation.

Key Specifications

Pinout & Package

TPS3825-50DBVR uses a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for high-density PCB layouts. 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 supervisor applications.

Compared with TPS3825-50DBVR, TPS3824-50DBVR removes MR functionality while retaining dual outputs, simplifying control but limiting reset initiation options; TPS3823-50DBVR retains MR but omits active-high RESET, increasing external component count for enable signaling.

Availability

TPS3825-50DBVR is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, and wireless gateways requiring stable component supply, long-term lifecycle assurance, and guaranteed traceability.

Supply support for TPS3825-50DBVR 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 delivering analog and embedded processing solutions, with deep expertise in power management, signal chain, and real-time control ICs.

The TPS382x family was designed specifically for reliable power sequencing and fault monitoring in DSP, microcontroller, and microprocessor systems - emphasizing low quiescent current, fixed thresholds, and integrated watchdog functionality.

FAQ

What is the exact reset threshold voltage for TPS3825-50DBVR?

The TPS3825-50DBVR has a negative-going input threshold voltage (V_IT−) of 4.49 V (min), 4.55 V (typ), and 4.64 V (max) across −40°C to 85°C. This 50 mV hysteresis ensures clean transition behavior on noisy 5 V rails without oscillation, and the value is factory-trimmed - no external calibration is required for TPS3825-50DBVR.

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

Yes, TPS3825-50DBVR provides both RESET (Pin 1, active-low) and RESET (Pin 4, active-high) outputs in the same 5-pin SOT-23 package. Both are push-pull drivers capable of sinking 3 mA or sourcing 120 µA, enabling direct connection to bidirectional MCU reset pins or independent enable inputs without external logic.

How does the watchdog timer function on TPS3825-50DBVR?

The TPS3825-50DBVR watchdog timer triggers reset if the WDI pin remains static (high or low) beyond 0.9–2.5 s. It resets on each falling edge of WDI, making it compatible with standard firmware heartbeat toggles. If WDI floats, internal pulses prevent spurious timeouts - but for deterministic behavior, drive WDI actively in your TPS3825-50DBVR design.

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

Yes, the MR pin of TPS3825-50DBVR features an internal 90 kΩ pullup resistor. Leaving it open defaults to inactive (high), allowing normal power-on and watchdog reset operation. To assert reset externally, pull MR below 0.3×VDD; for unused designs, connecting MR to VDD is electrically equivalent and eliminates floating node concerns in TPS3825-50DBVR layouts.

What is the operating temperature range specified for TPS3825-50DBVR?

The TPS3825-50DBVR is characterized for operation from −40°C to +85°C ambient temperature. This range covers standard industrial environments and is validated per TI's production test flow. Unlike the TPS3823A-33 variant, TPS3825-50DBVR does not extend to 125°C - thermal design should maintain junction temperature within this limit for full specification compliance.