Texas Instruments TPS3824-30DBVRG4

Overview

TPS3824-30DBVRG4 from Texas Instruments is a fixed-threshold voltage supervisor IC with integrated watchdog timer, active-low and active-high reset outputs, and manual reset input - designed for reliable power-on reset and system supervision in microcontroller-based applications. It monitors 3.0V supply rails, provides 200ms reset delay, consumes 15μA typical supply current, and operates across −40°C to 85°C in a 5-pin SOT-23 package.

For engineers reviewing the TPS3824-30DBVRG4 datasheet, TPS3824-30DBVRG4 pinout, TPS3824-30DBVRG4 application, or TPS3824-30DBVRG4 equivalent, this page delivers verified electrical specifications, functional pin roles, real-world use cases in embedded control and portable systems, and validated alternative parts for design flexibility and supply continuity.

Technical Context

The TPS3824-30DBVRG4 implements a precision voltage comparator with 2.57V to 2.69V negative-going threshold (V_IT−) and 50mV hysteresis to reject supply noise. Its internal watchdog timer triggers reset after 1.6s of WDI inactivity, and its dual-reset architecture supports both push-pull active-low (RESET) and active-high (RESET) outputs - enabling direct interface with bidirectional reset pins or level-sensitive logic without external inverters.

Reset assertion begins when VDD rises above 1.1V; the output remains active until VDD exceeds V_IT− + V_HYS, then holds for 200ms before releasing. The MR input forces immediate reset regardless of VDD or watchdog state, and internal 90kΩ pullup eliminates need for external biasing when unused.

Key Specifications

Pinout & Package

TPS3824-30DBVRG4 uses a 5-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, optimized for space-constrained PCB layouts in portable and industrial electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3823-30DBVR and MAX6326–MAX6328, the TPS3824-30DBVRG4 uniquely delivers dual reset polarity plus watchdog and manual reset in one 5-pin package - reducing component count and enabling more robust fault recovery in resource-constrained embedded systems.

Availability

TPS3824-30DBVRG4 is available at Aetrix Electronics and suitable for microcontroller-based systems, industrial automation equipment, and portable medical devices requiring stable component supply and long-term lifecycle support.

Supply support for TPS3824-30DBVRG4 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, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.

The TPS382x product line delivers compact, low-power voltage supervisors with integrated watchdog and reset functionality - engineered specifically for reliable power sequencing and firmware supervision in DSP, MCU, and microprocessor systems.

FAQ

What is the exact supply voltage threshold monitored by the TPS3824-30DBVRG4?

The TPS3824-30DBVRG4 monitors a nominal 3.0V supply with a negative-going input threshold (V_IT−) of 2.57V to 2.69V over −40°C to 85°C, and 50mV hysteresis. This ensures precise supervision of 3.0V rails while rejecting noise-induced false resets. The TPS3824-30DBVRG4 achieves this using an internal voltage divider, requiring no external components for threshold setting.

Does the TPS3824-30DBVRG4 support both active-high and active-low reset outputs simultaneously?

Yes, the TPS3824-30DBVRG4 provides both active-low RESET (Pin 1) and active-high RESET (Pin 3) push-pull outputs concurrently. This dual-output architecture allows direct connection to processors with bidirectional reset pins or to logic that requires either polarity - eliminating external inverters or pull resistors. The TPS3824-30DBVRG4 is the only member of the TPS382x family offering this dual-output capability.

How does the watchdog timer function in the TPS3824-30DBVRG4?

The TPS3824-30DBVRG4 watchdog timer times out after 1.6s (0.9s–2.5s range) if the WDI pin does not receive a falling edge. A timeout triggers the reset outputs for 200ms. The timer clears on any WDI falling edge or when RESET is asserted. If WDI is left unconnected, the TPS3824-30DBVRG4 generates internal pulses to prevent spurious timeouts - a feature confirmed in TI's SLVS165O datasheet.

What is the reset delay time of the TPS3824-30DBVRG4, and how is it triggered?

The TPS3824-30DBVRG4 has a reset delay time (t_d) of 120ms to 300ms (typ. 200ms), measured from when VDD rises above V_IT− + V_HYS. This delay ensures the monitored supply is fully stabilized before releasing reset. The delay is fixed and internal - no external capacitor or resistor is needed. The TPS3824-30DBVRG4 initiates this delay automatically during power-up and also after any VDD dip below V_IT−.

Can the manual reset (MR) input of the TPS3824-30DBVRG4 be left unconnected?

Yes, the MR input of the TPS3824-30DBVRG4 features an internal 90kΩ pullup resistor to VDD, allowing it to be left unconnected when manual reset functionality is not required. Pulling MR low forces immediate reset regardless of VDD level or watchdog state. Leaving MR open ensures normal voltage-monitoring operation without unintended reset assertion - a design feature explicitly documented for the TPS3824-30DBVRG4 in TI's official datasheet.