Texas Instruments TPS3823-25QDBVRQ1

Overview

TPS3823-25QDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive voltage supervisor with integrated watchdog timer, fixed 200ms reset delay, active-low push-pull RESET output, and 2.5V supply monitoring threshold (V_IT− = 2.25 V, ±2.5%). It monitors microcontroller power rails in engine control units and ADAS domain controllers to ensure reliable power-on initialization and fault-triggered recovery.

For engineers reviewing the TPS3823-25QDBVRQ1 datasheet, TPS3823-25QDBVRQ1 pinout, TPS3823-25QDBVRQ1 application, or TPS3823-25QDBVRQ1 equivalent, key selection criteria include its −40°C to 125°C operation, 15µA typical supply current, manual reset (MR) input support, watchdog timeout of 1.6s, and SOT-23-5 package compatibility with space-constrained automotive PCB layouts.

Technical Context

The TPS3823-25QDBVRQ1 implements a precision bandgap-based voltage reference and comparator to detect V_DD crossing the 2.25V threshold with 30mV hysteresis. Its internal 200ms power-on reset timer begins after V_DD exceeds V_IT− + V_HYS, ensuring stable processor release. The watchdog logic triggers RESET if WDI fails to toggle within 1.6s, with automatic clearing on falling-edge detection or RESET assertion.

It features a dedicated MR input with 90kΩ internal pullup, enabling external system-level reset initiation independent of V_DD level. All logic outputs are push-pull, supporting direct interfacing with microcontroller reset pins without external pull resistors - unlike open-drain variants such as TPS3828-xx-Q1.

Key Specifications

Pinout & Package

TPS3823-25QDBVRQ1 uses a 5-pin SOT-23 (DBV) package with nominal body size 2.90 mm × 1.60 mm and thermal resistance R_θJA = 185°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3823-25DBVR, the TPS3823-25QDBVRQ1 adds AEC-Q100 qualification and automotive-grade ESD robustness; compared with MAX6373KA25+T, it provides integrated watchdog capability essential for ASIL-compliant systems but trades off threshold accuracy for automotive qualification and feature integration.

Availability

TPS3823-25QDBVRQ1 is available at Aetrix Electronics and suitable for automotive engine control units, ADAS domain controllers, and electric power steering systems requiring stable component supply with full AEC-Q100 traceability and long-term lifecycle support.

Supply support for TPS3823-25QDBVRQ1 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 IC design and AEC-Q100 qualified product portfolios.

The TPS382x-Q1 family was developed specifically for automotive power-supply supervision in safety-critical electronic control units, integrating reset timing, watchdog monitoring, and manual reset capability in a single SOT-23 package.

FAQ

What is the exact supply voltage threshold and tolerance for TPS3823-25QDBVRQ1?

The TPS3823-25QDBVRQ1 has a nominal negative-going input threshold voltage (V_IT−) of 2.25 V, with a tolerance of ±2.5% over the full −40°C to 125°C operating temperature range. This value is factory-trimmed and specified in the Electrical Characteristics table of the official datasheet (SGLS143E), ensuring precise 2.5V rail supervision without external calibration.

Does TPS3823-25QDBVRQ1 support manual reset functionality?

Yes, TPS3823-25QDBVRQ1 includes a dedicated MR (manual reset) input on Pin 3. Pulling MR low forces an immediate active-low RESET assertion regardless of V_DD level or watchdog state. An internal 90kΩ pullup resistor holds MR high when unconnected, and the input accepts standard CMOS logic levels per recommended operating conditions.

What is the watchdog timeout period for TPS3823-25QDBVRQ1, and how is it triggered?

The TPS3823-25QDBVRQ1 watchdog timer has a nominal timeout period of 1.6 seconds. It is triggered when the WDI input (Pin 4) remains static - either high or low - beyond this interval. A falling edge on WDI clears the timer; if WDI floats, the device generates internal pulses to prevent false timeout. This behavior is documented in Section 7.3.4 of the datasheet.

Can TPS3823-25QDBVRQ1 operate with supply voltages below 2.5V?

Yes, TPS3823-25QDBVRQ1 functions as a supervisor down to V_DD = 1.1 V, though its 2.25V threshold detection only becomes valid once V_DD exceeds that level. The device draws only 15µA typical supply current at V_DD = 2.5V and remains operational up to 5.5V, making it suitable for systems with wide-input LDOs or battery-backed rails.

Is TPS3823-25QDBVRQ1 pin-compatible with other members of the TPS382x-Q1 family?

TPS3823-25QDBVRQ1 shares the same 5-pin SOT-23 (DBV) package and pinout with TPS3820/3/5/8-xx-Q1 variants, including identical RESET, GND, MR, WDI, and VDD assignments. However, functional differences exist: TPS3824/5-xx-Q1 add active-high RESET, and TPS3828-xx-Q1 use open-drain output - requiring schematic review before substitution.