Texas Instruments TPS3820-50QPDBVRQ1

Overview

TPS3820-50QPDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive voltage supervisor IC with integrated watchdog timer, active-low push-pull reset output, manual reset input, and fixed 4.55 V threshold (V_IT−) for 5 V supply monitoring. It delivers 25 ms power-on reset delay, 15 µA typical supply current, and operates from −40°C to 125°C in a 5-pin SOT-23 package. It is used in automotive microcontrollers to ensure reliable power-up sequencing and fault recovery.

For engineers reviewing the TPS3820-50QPDBVRQ1 datasheet, TPS3820-50QPDBVRQ1 pinout, TPS3820-50QPDBVRQ1 application, or TPS3820-50QPDBVRQ1 equivalent, this page provides verified functional identity, validated pin functions, confirmed timing parameters (25 ms delay, 200 ms watchdog timeout), automotive-grade thermal and ESD specs, and real-world implementation context for DSP/microcontroller supervision.

Technical Context

The TPS3820-50QPDBVRQ1 implements a fixed-threshold voltage supervision architecture with internal 4.55 V (typ) detection point and 50 mV hysteresis, enabling robust immunity to supply noise during brownout conditions. Its watchdog timer triggers reset if WDI input fails to toggle within 200 ms, and its manual reset (MR) input forces active-low reset regardless of VDD level.

It uses a dual-stage reset assertion logic: RESET activates when VDD rises above 1.1 V at power-on, then remains asserted until VDD exceeds V_IT− + V_HYS, after which the 25 ms internal timer begins. A subsequent drop below V_IT− reasserts RESET immediately - no external components required.

Key Specifications

Pinout & Package

TPS3820-50QPDBVRQ1 is housed in a 5-pin SOT-23 (DBV) package with nominal body size 2.90 mm × 1.60 mm and standard lead pitch. Pin functions are validated per TI SGLS143E datasheet Figures 5-1 and Table 5-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3823-50QPDBVRQ1 and TPS3825-50QPDBVRQ1, the TPS3820-50QPDBVRQ1 offers the shortest reset delay in the family, enabling faster system boot while retaining full watchdog and manual reset functionality - ideal for latency-sensitive automotive control nodes.

Availability

TPS3820-50QPDBVRQ1 is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, and body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3820-50QPDBVRQ1 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, embedded processing, and automotive-grade ICs, with decades of leadership in power management and system supervision solutions.

The TPS382x-Q1 product line was designed specifically for automotive safety-critical applications, delivering AEC-Q100 qualified voltage supervision with integrated watchdog and manual reset in miniature SOT-23 packages.

FAQ

What is the exact reset threshold voltage for TPS3820-50QPDBVRQ1 across temperature?

The TPS3820-50QPDBVRQ1 has a negative-going input threshold voltage (V_IT−) of 4.44 V (min) to 4.64 V (max) over −40°C to 125°C, with 4.55 V typical at 25°C. This 50 mV hysteresis ensures stable reset deassertion and prevents chatter during supply droop. The value is factory-trimmed and does not require external calibration - all specifications are guaranteed per TI SGLS143E datasheet Section 6.5.

Does TPS3820-50QPDBVRQ1 require external components for basic operation?

No, the TPS3820-50QPDBVRQ1 requires no external resistors, capacitors, or timing components for core supervision functionality. Its fixed 4.55 V threshold, 25 ms delay, and 200 ms watchdog are implemented entirely internally. A 0.1 µF ceramic capacitor on VDD is recommended only for noisy supplies - it is not mandatory for specification compliance.

How does the watchdog timer in TPS3820-50QPDBVRQ1 behave when WDI is left unconnected?

When WDI is floating, the TPS3820-50QPDBVRQ1 generates internal pulses to prevent unintended watchdog timeout. This default behavior avoids spurious resets in systems where watchdog monitoring is unused. To disable watchdog entirely, tie WDI to VDD or GND - do not leave it open in production designs requiring deterministic behavior.

Can TPS3820-50QPDBVRQ1 drive a microcontroller reset pin directly?

Yes, the TPS3820-50QPDBVRQ1 features a push-pull active-low RESET output capable of sinking 3 mA at 0.45 V (V_OL). It can directly drive standard CMOS reset inputs without external pull-up resistors. For microcontrollers with bidirectional reset pins, verify that short-circuit current (−800 µA max) falls within the host device's sink capability per its datasheet.

Is TPS3820-50QPDBVRQ1 pin-compatible with other devices in the TPS382x-Q1 family?

Yes, all TPS382x-xx-Q1 devices in the DBV (SOT-23) package share identical 5-pin layout and pin functions: RESET (1), GND (2), MR (3), WDI (4), VDD (5). This allows direct substitution between variants like TPS3820-50QPDBVRQ1, TPS3823-50QPDBVRQ1, and TPS3825-50QPDBVRQ1 on the same PCB footprint - only firmware and timing behavior differ.