Texas Instruments TPS3820-50DBVRQ1G4

Overview

TPS3820-50DBVRQ1G4 from Texas Instruments is an AEC-Q100 Grade 1 automotive voltage supervisor IC with integrated watchdog timer and manual reset input, designed for power-on reset generation (25ms fixed delay), supply monitoring at 4.55V nominal threshold (±50mV hysteresis), and active-low push-pull reset output - used in engine control units, ADAS domain controllers, and automotive microcontrollers requiring reliable startup and fault recovery.

For engineers reviewing the TPS3820-50DBVRQ1G4 datasheet, TPS3820-50DBVRQ1G4 pinout, TPS3820-50DBVRQ1G4 application, or TPS3820-50DBVRQ1G4 equivalent, key selection criteria include its 25ms reset delay (vs. 200ms in TPS3823-Q1), 4.55V supervision threshold with ±50mV hysteresis, 15μA typical supply current, −40°C to 125°C operation, and SOT-23-5 package compatibility with space-constrained automotive PCBs.

Technical Context

The TPS3820-50DBVRQ1G4 implements a fixed-threshold voltage supervisor with internal 52kΩ/40kΩ resistor divider setting V_IT− = 4.55V, combined with a watchdog timer that triggers reset if WDI input fails to toggle within 112–300ms. Its reset logic asserts active-low output when VDD falls below V_IT− or MR is pulled low, with propagation delay under 0.1μs from MR and 25μs from VDD transitions.

It operates across 1.1V–5.5V supply range, supports manual reset forcing independent of VDD status, and features internal pullup on MR (90kΩ) and watchdog input conditioning that prevents false timeout when WDI floats - enabling robust integration into automotive DSP and MCU power sequencing without external components.

Key Specifications

Pinout & Package

TPS3820-50DBVRQ1G4 uses a 5-pin SOT-23 (DBV) package with 2.90mm × 1.60mm body size, optimized for high-density automotive PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3823-50DBVRQ1 and TPS3825-50DBVRQ1, the TPS3820-50DBVRQ1 delivers the shortest reset delay (25ms) in the family while retaining full watchdog and manual reset functionality - making it optimal for automotive subsystems demanding rapid initialization without sacrificing fault coverage.

Availability

TPS3820-50DBVRQ1G4 is available at Aetrix Electronics and suitable for automotive engine control units, ADAS domain controllers, and electric power steering modules requiring stable component supply across extended temperature and lifecycle requirements.

Supply support for TPS3820-50DBVRQ1G4 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 automotive-grade IC design and AEC-Q100 qualification infrastructure.

The TPS382x-Q1 product line was developed specifically for automotive power sequencing and fault recovery, targeting DSP, MCU, and SoC-based systems needing guaranteed reset assertion, watchdog supervision, and operation from −40°C to 125°C.

FAQ

What is the exact reset threshold voltage for TPS3820-50DBVRQ1G4 over temperature?

The TPS3820-50DBVRQ1G4 has a nominal negative-going input threshold voltage (V_IT−) of 4.55V, with guaranteed range of 4.44V to 4.64V across −40°C to 125°C operating temperature. This 50mV hysteresis ensures immunity to supply noise during transitions near the threshold. The value is factory-trimmed and does not require external calibration. All TPS3820-50DBVRQ1G4 units meet this specification per TI's production test flow.

Does TPS3820-50DBVRQ1G4 require external components for basic operation?

No, the TPS3820-50DBVRQ1G4 requires no external components for core supervision functionality. Its fixed 4.55V threshold is set by an internal resistor divider, the 25ms reset delay is generated on-chip, and the MR pin includes a 90kΩ internal pullup. A 0.1μF ceramic capacitor on VDD is recommended only for noisy supplies - not mandatory for functional operation.

How does the watchdog timer in TPS3820-50DBVRQ1G4 behave when the WDI pin is left unconnected?

When WDI is floating, the TPS3820-50DBVRQ1G4 internally generates periodic pulses to prevent watchdog timeout - ensuring RESET remains inactive. This default behavior avoids spurious resets in systems where watchdog monitoring is unused. To disable watchdog entirely, tie WDI to a fixed logic level (high or low); leaving it open is safe and intentional per TI's design.

Is TPS3820-50DBVRQ1G4 pin-compatible with other devices in the TPS382x-Q1 family?

Yes, all TPS382x-Q1 devices in the DBV (SOT-23-5) package share identical pinout: Pin 1 = RESET, Pin 2 = GND, Pin 3 = MR, Pin 4 = WDI, Pin 5 = VDD. This allows direct substitution between TPS3820-, TPS3823-, TPS3824-, TPS3825-, and TPS3828-Q1 variants without PCB changes - though functional differences (e.g., reset delay, output polarity) must be verified in system firmware.

What is the maximum sink current capability of the RESET output in TPS3820-50DBVRQ1G4?

The RESET output of TPS3820-50DBVRQ1G4 is a push-pull driver capable of sinking up to 3mA while maintaining VOL ≤ 0.45V (tested at VDD = V_IT− – 0.2V). This allows direct interface with most automotive MCUs' reset inputs without external pull-down resistors. Source current is rated at 120μA for VOH ≥ VDD – 1.5V, sufficient for driving CMOS inputs.