Texas Instruments TPS3820-33QPDBVRQ1

Overview

TPS3820-33QPDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive voltage supervisor IC with integrated watchdog timer, fixed 3.3 V supply monitoring threshold (V_IT− = 2.84–3.00 V), 25 ms reset delay, and active-low push-pull RESET output. It monitors microcontroller power rails in engine control units and ADAS domain controllers, asserting reset below threshold and providing manual reset (MR) and watchdog input (WDI) for system-level fault recovery.

For engineers reviewing the TPS3820-33QPDBVRQ1 datasheet, TPS3820-33QPDBVRQ1 pinout, TPS3820-33QPDBVRQ1 application, or TPS3820-33QPDBVRQ1 equivalent, this page delivers verified technical context, exact pin functions, automotive-grade timing specs (25 ms delay, 112–300 ms watchdog timeout), and validated alternatives for functional replacement in safety-critical embedded designs.

Technical Context

The TPS3820-33QPDBVRQ1 implements a fixed-threshold supervision architecture with internal voltage divider setting V_IT− at 3.3 V nominal, hysteresis of 50 mV, and power-on reset assertion at V_DD ≥ 1.1 V. Its watchdog timer triggers reset if WDI remains static beyond 112–300 ms, cleared only by falling edge or RESET assertion.

It operates across −40°C to 125°C with 15 µA typical supply current, supports manual reset via MR pin (internal 90 kΩ pullup), and uses push-pull active-low RESET output capable of sinking 3 mA at V_OL ≤ 0.45 V - all in a 5-pin SOT-23 (DBV) package with 2.90 mm × 1.60 mm footprint.

Key Specifications

Pinout & Package

TPS3820-33QPDBVRQ1 uses a 5-pin SOT-23 (DBV) package with 2.90 mm × 1.60 mm 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 supervision applications.

Compared with TPS3823-33QPDBVRQ1, the TPS3820-33QPDBVRQ1 reduces reset delay by 87.5% for faster boot; versus TPS3820-33QDBVRQ1, it offers assured supply continuity and updated manufacturing traceability.

Availability

TPS3820-33QPDBVRQ1 is available at Aetrix Electronics and suitable for automotive engine control, ADAS domain controllers, and body electronics requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TPS3820-33QPDBVRQ1 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 specializing in analog, embedded processing, and automotive-grade ICs, with decades of experience in safety-critical power management solutions.

The TPS382x-Q1 product line delivers AEC-Q100-qualified voltage supervisors for automotive microcontroller systems, designed specifically to meet ISO 26262 readiness requirements in power-on initialization and runtime fault detection.

FAQ

What is the exact reset threshold voltage range for TPS3820-33QPDBVRQ1 over temperature?

The TPS3820-33QPDBVRQ1 has a negative-going input threshold voltage (V_IT−) of 2.84 V (min) to 3.00 V (max) across −40°C to 125°C ambient temperature, with 50 mV hysteresis to ensure noise immunity. This is factory-trimmed and does not require external calibration. The TPS3820-33QPDBVRQ1 maintains this specification under all recommended operating conditions per TI SGLS143E datasheet Section 6.5.

Does TPS3820-33QPDBVRQ1 support manual reset functionality, and how is it implemented?

Yes, TPS3820-33QPDBVRQ1 supports manual reset via Pin 3 (MR). Pulling MR low forces immediate active-low RESET assertion regardless of V_DD level or watchdog state. An internal 90 kΩ pullup resistor holds MR high when unconnected. The TPS3820-33QPDBVRQ1 accepts standard CMOS logic levels (V_IL ≤ 0.3×V_DD, V_IH ≥ 0.7×V_DD) and responds to pulse widths ≥1 µs per Section 6.6.

What is the watchdog timeout window for TPS3820-33QPDBVRQ1, and how is it cleared?

The TPS3820-33QPDBVRQ1 watchdog timeout (t_tout) is 112–300 ms. It is cleared exclusively by a falling edge on the WDI pin (Pin 4); static high or low states exceeding this window trigger RESET. If WDI is left floating, the TPS3820-33QPDBVRQ1 internally generates pulses to prevent timeout - a feature documented in Section 7.3.4 and Figure 6-1.

Can TPS3820-33QPDBVRQ1 operate with supply voltages below 3.3 V, and what is its minimum operating voltage?

Yes, TPS3820-33QPDBVRQ1 operates from V_DD = 1.1 V to 5.5 V per Section 6.3. Its power-on reset asserts at V_DD ≥ 1.1 V, and supervision remains active down to 1.1 V - enabling use in brownout detection and multi-rail systems where 3.3 V may dip transiently. The TPS3820-33QPDBVRQ1's 3.3 V threshold applies only to the monitored rail, not its own supply limit.

Is TPS3820-33QPDBVRQ1 pin-compatible with other members of the TPS382x-Q1 family?

TPS3820-33QPDBVRQ1 shares the same 5-pin SOT-23 (DBV) package and pinout with TPS3823/3824/3825/3828-xx-Q1 variants, including identical VDD (Pin 5), GND (Pin 2), RESET (Pin 1), MR (Pin 3), and WDI (Pin 4) assignments. However, output logic polarity and watchdog presence differ across variants - verify RESET behavior and WDI requirement before substitution. The TPS3820-33QPDBVRQ1 is not pin-compatible with active-high-output or open-drain variants like TPS3824-Q1.