Texas Instruments TPS3825-33QDBVRQ1

Overview

TPS3825-33QDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive voltage supervisor with integrated watchdog timer and manual reset input, monitoring 3.3 V supply rails with 2.84–3.00 V threshold, 200 ms reset delay, 15 µA typical supply current, and push-pull active-low/active-high dual reset outputs in a 5-pin SOT-23 package for microcontroller power-on initialization and fault recovery in engine control units.

For engineers reviewing the TPS3825-33QDBVRQ1 datasheet, TPS3825-33QDBVRQ1 pinout, TPS3825-33QDBVRQ1 application, or TPS3825-33QDBVRQ1 equivalent, this page delivers verified electrical specs, automotive-grade thermal and ESD ratings, functional mode behavior, and real-world implementation guidance for safety-critical vehicle systems.

Technical Context

The TPS3825-33QDBVRQ1 implements fixed-threshold supervision (V_IT− = 2.84–3.00 V) with hysteresis (50 mV), internal 200 ms power-on reset delay, and 1.6 s watchdog timeout triggered by WDI falling edges. It asserts RESET low when VDD drops below V_IT−, holds RESET low for td after VDD recovers above V_IT− + V_HYS, and supports manual reset assertion via MR pin.

Its dual-output architecture provides both active-low RESET and active-high RESET signals simultaneously, enabling direct interface to processors requiring either polarity without external inverters. The device operates across −40°C to 125°C, draws only 15 µA at 3.3 V, and features internal pullup on MR (90 kΩ) and ESD protection per AEC-Q100 (HBM ±2000 V, CDM ±750 V).

Key Specifications

Pinout & Package

TPS3825-33QDBVRQ1 uses a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, 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 TPS3824-33QDBVRQ1 and TPS3823-33QDBVRQ1, the TPS3825-33QDBVRQ1 uniquely combines manual reset, watchdog timer, and dual-polarity outputs in one 5-pin SOT-23 - enabling full reset control without external logic or additional ICs in new automotive designs.

Availability

TPS3825-33QDBVRQ1 is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, body control modules, electric power steering controllers, and infotainment head units requiring stable component supply across automotive production lifecycles.

Supply support for TPS3825-33QDBVRQ1 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 designing analog and embedded processing chips for industrial, automotive, and consumer applications, with leadership in power management and signal chain technologies.

The TPS382x-xx-Q1 product line delivers AEC-Q100-qualified voltage supervisors for automotive electronic control units, emphasizing robust power-on reset generation, watchdog supervision, and manual reset capability in compact packages.

FAQ

What is the exact reset threshold voltage range for TPS3825-33QDBVRQ1 across temperature?

The TPS3825-33QDBVRQ1 has a guaranteed negative-going input threshold voltage (V_IT−) of 2.84 V to 3.00 V over the full −40°C to 125°C operating temperature range, specifically calibrated for 3.3 V supply monitoring with 50 mV hysteresis to prevent chatter during noisy rail conditions. This specification is measured per TI's SGLS143E datasheet Section 6.5 and applies directly to the TPS3825-33QDBVRQ1 device.

Does TPS3825-33QDBVRQ1 support both active-low and active-high reset outputs simultaneously?

Yes, the TPS3825-33QDBVRQ1 provides two independent reset outputs: Pin 1 (RESET) is active-low push-pull, and Pin 4 (RESET) is active-high push-pull. Both signals assert/deassert in synchrony during power-on, brownout, or watchdog timeout events. This dual-output capability is intrinsic to the TPS3825-33QDBVRQ1 silicon design and eliminates need for external inverters in systems requiring mixed reset polarities.

How does the watchdog timer in TPS3825-33QDBVRQ1 function, and what is its timeout period?

The TPS3825-33QDBVRQ1 watchdog timer triggers a reset if the WDI pin does not see a falling edge within 0.9–2.5 s (nominal 1.6 s). The timer clears on each valid WDI transition and reinitializes upon reset assertion. This behavior is confirmed in Section 6.7 and Figure 6-1 of the TI datasheet and is a core feature of the TPS3825-33QDBVRQ1 - distinct from variants like TPS3820-Q1 (25 ms delay) or TPS3828-Q1 (open-drain output).

What is the purpose of the MR pin on TPS3825-33QDBVRQ1, and how is it biased?

The MR (manual reset) pin on TPS3825-33QDBVRQ1 is an active-low input that forces immediate reset regardless of VDD level or watchdog state. It features an internal 90 kΩ pullup resistor to VDD, allowing direct connection to ground for reset initiation or leaving unconnected for normal operation. This MR functionality is explicitly documented for TPS3825-33QDBVRQ1 in Section 5 (Pin Functions) and Table 7-1 (Function Table) of the official datasheet.

Is TPS3825-33QDBVRQ1 qualified for automotive use, and what AEC-Q100 grades does it meet?

Yes, TPS3825-33QDBVRQ1 is fully AEC-Q100 qualified for automotive applications, achieving Grade 1 performance with operating temperature range of −40°C to 125°C, HBM ESD rating of ±2000 V, and CDM ESD rating of ±750 V. These qualifications are explicitly stated in Section 1 (Features) and Section 6.2 of the TI SGLS143E datasheet and apply specifically to the TPS3825-33QDBVRQ1 part number.