Texas Instruments TPS3823A-33DBVR

Overview

TPS3823A-33DBVR from Texas Instruments is a 3.3V supply voltage supervisor IC with integrated watchdog timer, active-low push-pull reset output, manual reset input, and 200ms reset delay. It monitors VDD for power-on reset and brownout detection, asserts RESET when VDD falls below 2.83–3.00V, and triggers reset if WDI lacks transitions within 0.9–2.5s. Used in microcontroller-based systems requiring reliable power sequencing and fault recovery.

For engineers reviewing the TPS3823A-33DBVR datasheet, TPS3823A-33DBVR pinout, TPS3823A-33DBVR application, or TPS3823A-33DBVR equivalent, key selection criteria include its −40°C to 125°C extended temperature rating, fixed 3.3V threshold with 30mV hysteresis, 15μA typical supply current, SOT-23-5 package compatibility, and watchdog timeout behavior under system lockup conditions.

Technical Context

The TPS3823A-33DBVR implements a precision bandgap-based voltage reference and comparator to detect VDD crossings of its 2.93V nominal threshold (±70mV over −40°C to 125°C), with built-in 30mV hysteresis to prevent chatter during slow-rising or noisy supplies. Its internal watchdog timer uses an RC oscillator with 1.6s nominal timeout (0.9–2.5s over temperature), cleared on falling edge of WDI or assertion of RESET.

Reset assertion follows a two-stage timing sequence: first, VDD must exceed 1.1V to enable internal circuitry; second, after VDD rises above VIT− + VHYS (≥2.96V), a 200ms delay (120–300ms over temperature) begins before RESET deasserts. Manual reset (MR) forces immediate low-active RESET regardless of VDD or watchdog state, with internal 90kΩ pull-up.

Key Specifications

Pinout & Package

TPS3823A-33DBVR is housed in a 5-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, with standard lead pitch and thermal performance optimized for PCB space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3823-33DBVR and MAX6326UT33+T, the TPS3823A-33DBVR uniquely combines extended temperature range, push-pull RESET, and identical footprint-enabling drop-in replacement in thermally demanding designs without layout or firmware changes.

Availability

TPS3823A-33DBVR is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and battery-powered IoT sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3823A-33DBVR 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The TPS382x product line delivers compact, low-power voltage supervisors with integrated watchdog timers, designed specifically for reliable power-on reset and fault recovery in microcontroller and DSP-based systems.

FAQ

What is the exact reset threshold voltage range for TPS3823A-33DBVR over temperature?

The TPS3823A-33DBVR has a negative-going input threshold voltage (VIT−) specified from 2.83V to 3.00V over the full −40°C to 125°C operating range. This 67mV window ensures robust 3.3V rail supervision with guaranteed margin against both initial tolerance and thermal drift, eliminating need for external calibration.

Does TPS3823A-33DBVR require external components to operate?

No, the TPS3823A-33DBVR requires no external components for basic operation. Its fixed 3.3V threshold is set by an internal voltage divider, and it includes an internal 90kΩ pull-up on MR. A 0.1μF ceramic bypass capacitor on VDD is recommended for noise immunity but not strictly required for functionality.

How does the watchdog timer in TPS3823A-33DBVR behave during reset assertion?

When RESET is asserted (low), the TPS3823A-33DBVR's watchdog timer is automatically reinitialized. The timer resumes counting from zero upon RESET deassertion. If WDI remains static during reset, no timeout occurs-unlike non-A versions, the 'A' suffix indicates this device avoids latching watchdog faults during active reset.

Can TPS3823A-33DBVR replace TPS3823-33DBVR without design changes?

Yes, TPS3823A-33DBVR is a direct pin-to-pin and functionally compatible replacement for TPS3823-33DBVR, with identical electrical characteristics and package. The only enhancement is extended temperature rating (−40°C to 125°C vs. −40°C to 85°C), making it suitable for higher ambient environments without layout or firmware modification.

What is the maximum sink current capability of the RESET output in TPS3823A-33DBVR?

The RESET output of TPS3823A-33DBVR is a push-pull driver capable of sinking up to 3mA while maintaining VOL ≤ 0.45V at VDD = 3.3V and TA = 125°C. This allows direct interfacing with most microcontroller reset inputs without external pull-up resistors or level translators.