Texas Instruments TPS3825-50QDBVRQ1

Overview

TPS3825-50QDBVRQ1 from Texas Instruments is an automotive-grade voltage supervisor IC with integrated watchdog timer and dual reset outputs (active-low RESET and active-high RESET), designed for supply rail monitoring in DSP/microcontroller systems. It features a fixed 4.55 V threshold voltage (V_IT−), 200 ms reset delay, 15 µA typical supply current, and operates across −40°C to 125°C. It is used in automotive microprocessor power-on reset and fault recovery circuits.

For engineers reviewing the TPS3825-50QDBVRQ1 datasheet, TPS3825-50QDBVRQ1 pinout, TPS3825-50QDBVRQ1 application, or TPS3825-50QDBVRQ1 equivalent, key selection criteria include its dual-output logic configuration, AEC-Q100 Grade 1 qualification, watchdog timeout behavior, manual reset support, and SOT-23-5 package compatibility with space-constrained automotive ECUs.

Technical Context

The TPS3825-50QDBVRQ1 implements a precision bandgap-based voltage reference and comparator to monitor VDD against a fixed 4.55 V threshold (±1.2% over temperature). Its internal 200 ms delay timer ensures stable reset assertion after power-up or brownout recovery, while the watchdog timer (1.6 s timeout) requires periodic WDI edge transitions to prevent spurious resets.

This device integrates both active-low and active-high push-pull reset outputs, enabling direct interface with microcontrollers requiring either logic polarity. The MR input supports external forced reset independent of VDD level, and the WDI pin accepts rising/falling edges - not level-sensitive - for robust watchdog triggering in noisy automotive environments.

Key Specifications

Pinout & Package

TPS3825-50QDBVRQ1 is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for high-density automotive PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3823-50QDBVRQ1, the TPS3825-50QDBVRQ1 adds active-high RESET for direct interface with processors requiring that logic polarity, eliminating external components. Compared with TPS3825-33QDBVRQ1, it maintains identical architecture but shifts threshold to 4.55 V - critical for accurate 5 V rail supervision where 2.93 V would cause false resets.

Availability

TPS3825-50QDBVRQ1 is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, and body control modules requiring stable component supply with full AEC-Q100 compliance and long-term production continuity.

Supply support for TPS3825-50QDBVRQ1 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 company specializing in analog and embedded processing technologies, with leadership in automotive, industrial, and power management ICs.

The TPS382x-xx-Q1 product line delivers AEC-Q100-qualified voltage supervisors for automotive microcontroller and DSP systems, emphasizing reliability, low quiescent current, and integrated watchdog functionality in compact packages.

FAQ

What is the exact threshold voltage of the TPS3825-50QDBVRQ1, and how does it vary with temperature?

The TPS3825-50QDBVRQ1 has a nominal negative-going input threshold voltage (V_IT−) of 4.55 V at 25°C, with a guaranteed range of 4.44 V to 4.64 V across −40°C to 125°C. This 1.2% total variation ensures precise 5 V rail monitoring without calibration, supported by 50 mV hysteresis to prevent chatter near threshold.

Does the TPS3825-50QDBVRQ1 require external components for basic operation?

No - the TPS3825-50QDBVRQ1 requires no external resistors or capacitors for core supervision. A 0.1 µF ceramic bypass capacitor on VDD is recommended for noise immunity, but the 4.55 V threshold, 200 ms delay, and watchdog timer are fully internal and factory-trimmed.

How does the watchdog timer in the TPS3825-50QDBVRQ1 respond to WDI signal transitions?

TPS3825-50QDBVRQ1's watchdog timer triggers on either rising or falling edges at the WDI pin - not level detection - with a 1.6 s timeout. If no edge occurs within that window, RESET and RESET assert for 200 ms. The timer resets immediately upon any valid edge or during active reset.

Can the MR pin of the TPS3825-50QDBVRQ1 be left unconnected, and what is its default state?

Yes - the MR pin has an internal 52 kΩ pullup resistor to VDD, so it defaults to inactive (high) when unconnected. Pulling MR low forces immediate reset regardless of VDD level or watchdog status, and RESET remains low for the full 200 ms delay after MR returns high.

Is the TPS3825-50QDBVRQ1 pin-compatible with other members of the TPS382x-Q1 family?

Yes - all TPS382x-xx-Q1 devices in the DBV (SOT-23-5) package share identical pinout and footprint, including TPS3823-50QDBVRQ1 and TPS3825-33QDBVRQ1. However, functional differences (e.g., presence of RESET, threshold voltage, watchdog inclusion) must be verified per part number before substitution.