Texas Instruments TPS3824-33DBVTG4

Overview

TPS3824-33DBVTG4 from Texas Instruments is a 3.3V supply voltage supervisor IC with integrated watchdog timer, active-low and active-high reset outputs, manual reset input, and 200ms power-on reset delay. It monitors VDD in microcontroller-based systems, asserts RESET when VDD drops below 2.88V (min), and provides fault detection via WDI pin timeout of 1.6s. Used in industrial controllers and portable equipment requiring reliable power sequencing and system recovery.

For engineers reviewing the TPS3824-33DBVTG4 datasheet, TPS3824-33DBVTG4 pinout, TPS3824-33DBVTG4 application, or TPS3824-33DBVTG4 equivalent, key selection criteria include its dual-reset output logic (RESET and RESET), fixed 3.3V threshold with ±70mV hysteresis, 15μA typical supply current, SOT-23-5 package compatibility, and watchdog timeout tolerance across −40°C to 85°C.

Technical Context

The TPS3824-33DBVTG4 implements a precision bandgap reference and comparator-based supervision architecture with internal 2.93V nominal threshold (VIT−) and 50mV hysteresis (VHYS). Its watchdog timer uses an internal oscillator to enforce a 1.6s timeout unless cleared by a falling edge on WDI - not a windowed or programmable timer.

It features dual-output drive capability: push-pull active-low RESET and push-pull active-high RESET, both rated for 3mA sink and 120μA source at VDD = 3.3V. The MR input includes a 90kΩ internal pullup and accepts standard CMOS logic levels, enabling direct connection to microcontroller GPIO without external biasing.

Key Specifications

Pinout & Package

TPS3824-33DBVTG4 is housed in a 5-pin SOT-23 (DBV) package with 2.90mm × 1.60mm body size and standard lead pitch. Pin 1 is RESET (active-low), Pin 2 is GND, Pin 3 is MR (manual reset input), Pin 4 is WDI (watchdog input), and Pin 5 is VDD (supply input).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3824-33DBVTG4, TPS3823-33DBVT offers identical supervision accuracy and timing but omits the active-high output, reducing pin count and cost; MAX6326UT33+T provides lower IDD and open-drain flexibility but removes watchdog functionality entirely - limiting use to basic power-on reset scenarios.

Availability

TPS3824-33DBVTG4 is available at Aetrix Electronics and suitable for industrial automation, portable medical devices, and wireless infrastructure equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS3824-33DBVTG4 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 for industrial, automotive, and communications markets.

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

FAQ

What is the exact reset threshold voltage for TPS3824-33DBVTG4?

The TPS3824-33DBVTG4 has a negative-going input threshold voltage (VIT−) of 2.88V (minimum), 2.93V (nominal), and 3.00V (maximum) over −40°C to +85°C. This 3.3V-specific threshold ensures robust supervision of 3.3V logic rails while maintaining margin against VIH/VIL violations in connected microcontrollers. The 50mV hysteresis prevents oscillation during slow or noisy supply transitions.

Does TPS3824-33DBVTG4 require external components for basic operation?

No, TPS3824-33DBVTG4 requires no external resistors or capacitors for core supervision functionality. A 0.1μF ceramic bypass capacitor is recommended at the VDD pin for noise immunity, but no external timing or threshold-setting components are needed - the 3.3V threshold, 200ms delay, and 1.6s watchdog are fully internal and factory-trimmed.

How does the watchdog timer in TPS3824-33DBVTG4 operate?

The TPS3824-33DBVTG4 watchdog timer triggers a reset if the WDI pin remains static (high or low) beyond 0.9s–2.5s. It resets on any falling edge at WDI and starts timing anew. If WDI floats, the device generates internal pulses to prevent spurious timeout. No external clock or configuration is required - the 1.6s nominal timeout is fixed and unadjustable.

Can TPS3824-33DBVTG4 drive both active-low and active-high reset inputs simultaneously?

Yes, TPS3824-33DBVTG4 provides two independent push-pull outputs: RESET (active-low) and RESET (active-high). Both are electrically isolated and can drive separate downstream inputs - for example, RESET to a microcontroller's /RESET pin and RESET to an FPGA's PROG_B pin - without level shifters or additional buffers.

What is the maximum sink current capability of the RESET output on TPS3824-33DBVTG4?

The RESET output of TPS3824-33DBVTG4 is specified to sink up to 3mA while maintaining VOL ≤ 0.4V at VDD = 3.3V and TA = 25°C. This allows direct driving of most microcontroller /RESET pins and logic inputs without external pull-down resistors or buffer stages - simplifying schematic design and improving noise immunity.