Texas Instruments TPS3823-50QDBVRQ1

Overview

TPS3823-50QDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive voltage supervisor IC with integrated watchdog timer, fixed 200ms reset delay, active-low push-pull RESET output, and 4.55V threshold (±1.2% over −40°C to 125°C). It monitors 5V supply rails in microcontroller-based automotive systems and asserts reset if VDD drops below VIT− or WDI fails to toggle within 1.6s.

For engineers reviewing the TPS3823-50QDBVRQ1 datasheet, TPS3823-50QDBVRQ1 pinout, TPS3823-50QDBVRQ1 application, or TPS3823-50QDBVRQ1 equivalent, key selection criteria include its qualified automotive temperature range (−40°C to 125°C), low 15µA supply current, manual reset input (MR), watchdog timeout stability, and SOT-23-5 package compatibility with space-constrained ECUs.

Technical Context

The TPS3823-50QDBVRQ1 implements a precision bandgap reference and comparator-based supervision architecture with internal hysteresis (50mV) and a dedicated watchdog timer logic block that triggers on missing WDI transitions. Its reset assertion is initiated at VDD > 1.1V and held until VDD exceeds VIT− = 4.55V, then delayed by 200ms before release.

It features dual-input supervision: primary VDD monitoring with fixed threshold and secondary watchdog supervision via WDI pin, where a falling edge clears the timer and absence of edges for ≥1.6s forces reset. MR provides asynchronous reset override independent of VDD level or watchdog state.

Key Specifications

Pinout & Package

TPS3823-50QDBVRQ1 is housed in a 5-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, 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 supervision applications.

Compared with TPS3823-50QDBVRQ1, TPS3823-50DBVR lacks automotive qualification and lifecycle support, while TPS3828-50QDBVRQ1 trades push-pull drive strength for open-drain flexibility - both retain identical supervision accuracy and watchdog functionality but differ in output stage topology and qualification scope.

Availability

TPS3823-50QDBVRQ1 is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, and transmission control systems requiring stable component supply with full AEC-Q100 traceability and long-term production support.

Supply support for TPS3823-50QDBVRQ1 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 leader specializing in analog and embedded processing technologies, with deep expertise in automotive-grade power management and system supervision solutions.

The TPS382x-Q1 product line was designed specifically for automotive electronics requiring high-reliability power sequencing, fault detection, and firmware watchdog coverage - targeting ECU, ADAS, and body control applications operating across extended temperature ranges.

FAQ

What is the exact reset threshold voltage of the TPS3823-50QDBVRQ1 and how does it vary with temperature?

The TPS3823-50QDBVRQ1 has a nominal negative-going input threshold voltage (V_IT−) of 4.55V, with guaranteed min/max values of 4.44V and 4.64V across −40°C to 125°C. This 1.2% tolerance ensures consistent 5V rail supervision without calibration. The normalized threshold drift is ≤±0.5% over temperature, verified per AEC-Q100 stress testing.

Does the TPS3823-50QDBVRQ1 require external components for basic operation?

No, the TPS3823-50QDBVRQ1 requires zero external components for core supervision functionality. Its fixed 4.55V threshold is set by an internal voltage divider, the 200ms reset delay is generated internally, and the watchdog timer uses on-chip timing. A 0.1µF ceramic capacitor on VDD is recommended only for noisy supplies - not mandatory.

How does the watchdog timer in the TPS3823-50QDBVRQ1 behave during power-up and reset assertion?

During power-up, the watchdog timer is disabled until VDD exceeds 1.1V and RESET deasserts. Once active, it requires a falling edge on WDI every ≤1.6s to avoid timeout. If WDI remains static (high or low) beyond 1.6s, RESET asserts for 200ms. During RESET assertion, WDI is ignored - the timer resets only after RESET deasserts and WDI receives a valid edge.

Can the MR pin of the TPS3823-50QDBVRQ1 be left floating, and what is its default state?

Yes, the MR pin can be left floating. It features an internal ~90kΩ pull-up resistor to VDD, holding it at logic high during normal operation. Pulling MR low (≤0.3×VDD) forces immediate RESET assertion, which persists for the full 200ms delay even after MR returns high - ensuring clean system restart.

What package type and footprint does the TPS3823-50QDBVRQ1 use, and is it RoHS-compliant?

The TPS3823-50QDBVRQ1 uses the DBV package: a 5-pin SOT-23 variant with 2.90mm × 1.60mm body size and standard 0.95mm pin pitch. It is lead-free, RoHS-compliant, and qualified for Pb-free reflow soldering per JEDEC J-STD-020. The package supports automated placement and is compatible with IPC-7351B footprint standards.