Texas Instruments TPS3823A-33DBVT

Overview

TPS3823A-33DBVT from Texas Instruments is a 3.3V fixed-threshold voltage supervisor IC with integrated watchdog timer, active-low push-pull reset output, manual reset input (MR), and 200ms reset delay. It monitors VDD supply rail in microcontroller-based systems, asserts RESET when VDD drops below 2.83–3.00V, and triggers system reset if WDI signal stalls beyond 0.9–2.5s. Used in industrial controllers and battery-powered DSPs requiring extended temperature operation.

For engineers reviewing the TPS3823A-33DBVT datasheet, TPS3823A-33DBVT pinout, TPS3823A-33DBVT application, or TPS3823A-33DBVT equivalent, key selection criteria include its −40°C to 125°C operating range, 15μA typical supply current, 5-pin SOT-23 package, 3.3V supervision threshold with 30mV hysteresis, and watchdog timeout compatibility with MSP430 and similar low-power MCUs.

Technical Context

The TPS3823A-33DBVT implements a precision bandgap reference and comparator-based threshold detection with internal 2.93V nominal V_IT−, enabling reliable power-on reset initiation at VDD ≥ 1.1V and sustained supervision down to 2.83V minimum. Its watchdog timer resets on missing WDI edge transitions and features non-latching behavior-unlike standard TPS3823 variants-allowing WDI pulses to clear reset even while RESET is asserted.

Reset assertion timing is governed by two independent delays: a fixed 200ms delay (t_d) after VDD rises above V_IT− + V_HYS, and a 0.9–2.5s watchdog timeout (t_tout). The MR input forces immediate reset regardless of VDD or watchdog state, and internal 90kΩ pullup eliminates external biasing requirements.

Key Specifications

Pinout & Package

TPS3823A-33DBVT is housed in a 5-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, optimized for space-constrained PCB layouts and compatible with standard pick-and-place assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3823-33DBVT, the TPS3823A-33DBVT adds guaranteed 125°C operation and non-latching watchdog behavior-critical for automotive and industrial thermal margins-while MAX6326LT33D3+T trades MR flexibility for tighter threshold accuracy in commercial applications.

Availability

TPS3823A-33DBVT is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3823A-33DBVT 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 over 50 years of innovation in power management and signal chain technologies.

The TPS382x family was designed specifically for robust power-supply supervision in processor-based systems-including microcontrollers, DSPs, and FPGAs-with emphasis on low-power operation, precise threshold accuracy, and watchdog reliability in harsh environments.

FAQ

What is the operating temperature range of the TPS3823A-33DBVT?

The TPS3823A-33DBVT is fully characterized from −40°C to 125°C, as confirmed in Section 6.6 of the official TI datasheet SLVS165O. This extended range distinguishes it from the standard TPS3823-33DBVT (−40°C to 85°C) and makes it suitable for under-hood automotive, industrial motor drives, and high-ambient embedded applications where thermal margin is critical. No derating is required within this range.

How does the 'A' suffix in TPS3823A-33DBVT affect watchdog behavior?

The 'A' suffix denotes non-latching watchdog functionality: the TPS3823A-33DBVT allows WDI falling edges to clear an active RESET signal, unlike the base TPS3823-33DBVT which latches RESET until VDD cycles or MR is asserted. This enables safer firmware recovery in real-time systems where watchdog timeout must not block subsequent WDI activity-confirmed in Section 7.3.4 and Figure 8-3 of the datasheet.

What is the exact reset threshold voltage for TPS3823A-33DBVT?

The TPS3823A-33DBVT has a negative-going input threshold voltage (V_IT−) of 2.83V (min), 2.93V (nom), and 3.00V (max) across −40°C to 125°C, per Section 6.6 Electrical Characteristics. This 3.3V nominal supervision point includes 30mV hysteresis (V_HYS) to prevent oscillation during supply transients, and is set by an internal precision voltage divider-no external components required.

Does TPS3823A-33DBVT require external components for basic operation?

No-TPS3823A-33DBVT operates with zero external components for core supervision. It integrates a 90kΩ MR pullup resistor and precision bandgap reference. Only a 0.1μF ceramic bypass capacitor on VDD (as specified in Section 6.5 Note 2) is mandatory for stable threshold performance. WDI can float safely due to internal pulse generation, eliminating need for pullup/pulldown resistors in default configurations.

What package type and dimensions does TPS3823A-33DBVT use?

TPS3823A-33DBVT uses the DBV package: a 5-pin SOT-23 variant with nominal body size 2.90mm × 1.60mm (including pins), per Section 11 Mechanical, Packaging, and Orderable Information. This JEDEC-standard footprint supports automated assembly, offers thermal resistance R_θJA = 185°C/W, and is pin-compatible with all TPS382x DBV variants-including TPS3823-33DBVT and TPS3828-33DBVT-enabling drop-in substitution where function matches.