Texas Instruments TPS3823-50DBVT

Overview

TPS3823-50DBVT from Texas Instruments is a 5-pin SOT-23 voltage supervisor IC with active-low push-pull RESET output, manual reset (MR) input, watchdog timer (1.6 s timeout), fixed 4.55 V threshold (V_IT−), and 200 ms reset delay. It monitors 5 V supply rails in microcontroller-based systems to ensure reliable power-on initialization and fault recovery.

For engineers reviewing the TPS3823-50DBVT datasheet, TPS3823-50DBVT pinout, TPS3823-50DBVT application, or TPS3823-50DBVT equivalent, key selection criteria include its 4.55 V supervision threshold, 1.6 s watchdog timeout, 200 ms reset delay, −40°C to 85°C operating range, and compatibility with 5 V DSP/microprocessor reset sequencing requirements.

Technical Context

The TPS3823-50DBVT implements a fixed-threshold voltage supervision architecture using an internal resistor divider to set V_IT− = 4.55 V (typical) with 50 mV hysteresis. Its watchdog timer triggers RESET if WDI receives no falling edge within 1.6 s, and its internal power-on reset circuit asserts RESET until VDD exceeds 1.1 V and remains above V_IT− + V_HYS for 200 ms.

It operates across 1.1 V to 5.5 V supply range with 15 µA typical quiescent current, supports manual reset assertion via MR pin (internally pulled up 90 kΩ), and delivers push-pull RESET output capable of sinking 3 mA at 0.4 V.

Key Specifications

Pinout & Package

TPS3823-50DBVT uses a 5-pin SOT-23 (DBV) package with 2.90 mm × 1.60 mm body size and standard lead pitch. Pin 1 is RESET (active-low push-pull output), Pin 2 is GND, Pin 3 is MR (manual reset input), Pin 4 is WDI (watchdog timer input), and Pin 5 is VDD (supply input).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3823-50DBVT, the TPS3823A-50DBVT adds extended thermal qualification without changing footprint or functionality, while the TPS3820-50DBVT trades longer reset hold time for faster system startup-making each optimal for distinct thermal or timing constraints in 5 V embedded designs.

Availability

TPS3823-50DBVT is available at Aetrix Electronics and suitable for industrial PLC controllers, 5 V microcontroller power sequencing, wireless baseband modules, and notebook system management requiring stable component supply and long-term production continuity.

Supply support for TPS3823-50DBVT 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 90 years of innovation in power management, signal chain, and real-time control ICs.

The TPS382x family was designed specifically for reliable power-on reset and runtime supervision of fixed-voltage rails (2.5 V, 3 V, 3.3 V, 5 V) in DSP, microcontroller, and microprocessor systems-emphasizing low quiescent current, integrated watchdog, and minimal external component count.

FAQ

What is the exact supply voltage threshold monitored by the TPS3823-50DBVT?

The TPS3823-50DBVT monitors a nominal 5 V supply with a negative-going input threshold voltage (V_IT−) of 4.55 V (typical), specified from 4.49 V (min) to 4.64 V (max) over −40°C to +85°C. This threshold is factory-trimmed and fixed-no external components are required to set it. The device asserts RESET when VDD falls below this value and releases it only after VDD rises above V_IT− + V_HYS (50 mV hysteresis) and remains stable for 200 ms.

Does the TPS3823-50DBVT require external components for basic operation?

No, the TPS3823-50DBVT requires no external components for core supervision functionality. Its 4.55 V threshold is set by an internal precision voltage divider, the 200 ms reset delay and 1.6 s watchdog timeout are fully internal, and the MR pin includes a 90 kΩ internal pull-up resistor. A 0.1 µF ceramic bypass capacitor on VDD is recommended per datasheet Section 6.5 Note (2) to stabilize the threshold reference, but it is not mandatory for functional operation.

How does the watchdog timer in the TPS3823-50DBVT function?

The TPS3823-50DBVT watchdog timer times out after 1.6 s (0.9–2.5 s over temperature) if no falling edge is detected on the WDI pin. Each falling edge resets the timer. If timeout occurs, RESET is asserted for 200 ms. The timer is automatically cleared when RESET goes active or upon a WDI falling edge. If WDI is left floating, the device generates internal pulses to prevent spurious timeouts-ensuring fail-safe operation even in unconnected configurations.

Can the TPS3823-50DBVT be used in automotive under-hood applications?

The standard TPS3823-50DBVT is rated for −40°C to +85°C operation and is not qualified for under-hood automotive use. However, the pin-compatible TPS3823A-50DBVT variant extends the operating range to −40°C to +125°C and shares identical electrical specifications-including 4.55 V threshold, 200 ms delay, and 1.6 s watchdog timeout-making it the appropriate choice for under-hood or high-temperature industrial deployments requiring the same functionality as the TPS3823-50DBVT.

What is the reset output configuration of the TPS3823-50DBVT?

The TPS3823-50DBVT features an active-low push-pull RESET output. It actively drives low during reset assertion and actively drives high (not open-drain) when released-eliminating the need for an external pull-up resistor. The output can sink up to 3 mA while maintaining VOL ≤ 0.4 V, ensuring compatibility with standard CMOS and TTL reset inputs across 5 V systems without additional interface circuitry.