Texas Instruments TPS3823-25DBVRG4

Overview

TPS3823-25DBVRG4 from Texas Instruments is a fixed-threshold voltage supervisor IC with integrated watchdog timer, active-low push-pull reset output, manual reset input, and 2.5V supply monitoring. It delivers 200ms reset delay, 1.6s watchdog timeout, 15μA typical supply current, and operates from −40°C to 85°C in microcontroller power-up sequencing and fault recovery circuits.

For engineers reviewing the TPS3823-25DBVRG4 datasheet, TPS3823-25DBVRG4 pinout, TPS3823-25DBVRG4 application, or TPS3823-25DBVRG4 equivalent, key selection criteria include its 2.5V threshold accuracy (±2.2%), watchdog time-out tolerance (±30%), SOT-23-5 package footprint, MR/WDI timing compatibility with MSP430 and ARM Cortex-M families, and absence of external components for basic supervision.

Technical Context

The TPS3823-25DBVRG4 implements a precision bandgap-based voltage reference feeding a comparator with 30mV hysteresis to detect VDD drops below 2.25V (nominal). Its internal 1.6s watchdog timer resets on WDI falling edges and latches during assertion-requiring system-level retriggering before timeout expiration.

Reset assertion occurs at VDD ≥ 1.1V during power-on, then remains active until VDD exceeds VIT− + VHYS (≥2.28V), after which the 200ms delay timer starts. The push-pull RESET output drives high to VDD − 1.5V at 3mA sink, enabling direct interface with 3.3V/5V logic without pull-up resistors.

Key Specifications

Pinout & Package

TPS3823-25DBVRG4 uses 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 equipment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3823A-25DBVR and TPS3820-25DBVR, the TPS3823-25DBVRG4 provides optimal balance of industrial-grade timing (200ms/1.6s), wide-temperature readiness, and cost-effective supervision-making it ideal for general-purpose embedded systems where extended temp rating or minimal delay isn't mandatory.

Availability

TPS3823-25DBVRG4 is available at Aetrix Electronics and suitable for microcontroller power sequencing, industrial PLC I/O modules, battery-powered edge nodes, and automotive body control modules requiring stable component supply across production lifecycles.

Supply support for TPS3823-25DBVRG4 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 power management, signal chain, and real-time control ICs.

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

FAQ

What is the exact supply voltage threshold for TPS3823-25DBVRG4?

The TPS3823-25DBVRG4 has a nominal negative-going input threshold voltage (VIT−) of 2.25V, specified from 2.21V (min) to 2.30V (max) over −40°C to 85°C. This threshold is factory-trimmed and fixed-no external components are required to set or adjust it. The 2.5V designation indicates its intended use for supervising 2.5V rails, and the 30mV hysteresis ensures noise immunity during supply transients.

Does TPS3823-25DBVRG4 require external components for basic operation?

No, the TPS3823-25DBVRG4 requires no external components for core supervision functionality. Its fixed 2.25V threshold is generated internally via a precision voltage divider, and the 200ms reset delay and 1.6s watchdog timer are fully integrated. A 0.1μF ceramic bypass capacitor at VDD is recommended per TI guidelines to stabilize the reference, but it is not strictly required for functional operation.

How does the watchdog timer in TPS3823-25DBVRG4 behave during reset assertion?

When TPS3823-25DBVRG4 asserts RESET due to VDD drop or watchdog timeout, the internal watchdog timer is reinitialized and begins counting again only after RESET returns high. During active RESET, WDI transitions are ignored-this latching behavior prevents premature timeout clearing. To enable WDI activity during reset, TI recommends using the TPS3823A variant or adding an external FET decoupler, as documented in SLVS165O Section 7.3.4.

What is the function of the MR pin on TPS3823-25DBVRG4?

The MR (Manual Reset) pin on TPS3823-25DBVRG4 is an active-low input that forces RESET assertion regardless of VDD level or watchdog state. Pulling MR low immediately activates RESET and holds it low for the full 200ms delay after MR returns high. An internal 90kΩ pull-up resistor keeps MR high when unconnected, making external biasing optional. This enables simple push-button reset or FPGA-controlled system recovery.

Is TPS3823-25DBVRG4 pin-compatible with other TPS382x variants?

Yes, TPS3823-25DBVRG4 shares identical pinout and SOT-23-5 (DBV) packaging with all TPS382x family members-including TPS3820-25DBVR, TPS3823A-25DBVR, and TPS3828-25DBVR. Pin functions (VDD, GND, RESET, MR, WDI) are consistent across the family, enabling direct substitution where functional requirements (e.g., watchdog presence, reset polarity, temperature grade) align. However, output type (push-pull vs open-drain) and timing parameters differ between variants.