Texas Instruments TPS3838E18QDBVRQ1

Overview

TPS3838E18QDBVRQ1 from Texas Instruments is an automotive-grade nanosupervisory circuit with 1.71 V fixed reset threshold, open-drain active-low RESET output, 220 nA typical supply current, 10 ms/200 ms selectable power-on reset delay, and operation from −40°C to 125°C in a 5-pin SOT-23 package. It monitors 1.8 V supply rails in battery-powered automotive microcontrollers and low-power DSPs.

For engineers reviewing the TPS3838E18QDBVRQ1 datasheet, TPS3838E18QDBVRQ1 pinout, TPS3838E18QDBVRQ1 application, or TPS3838E18QDBVRQ1 equivalent, key selection criteria include its open-drain RESET interface, nanosupply current, automotive qualification (AEC-Q100), manual reset capability, and CT-pin programmable delay timing.

Technical Context

The TPS3838E18QDBVRQ1 implements a precision bandgap-based voltage reference and internal hysteresis (40 mV typical) to ensure stable threshold detection at 1.71 V. Its reset assertion logic activates when VDD falls below VIT or during power-up until VDD exceeds 1.1 V, then enforces a delay before deassertion.

Delay timing is controlled by the CT pin: grounded for 10 ms typical delay, tied to VDD for 200 ms typical delay. The open-drain RESET output requires an external pull-up and supports wired-OR configurations in multi-rail systems.

Key Specifications

Pinout & Package

TPS3838E18QDBVRQ1 uses a 5-pin SOT-23 (DBV) package, 2.9 mm × 1.6 mm × 1.15 mm, RoHS-compliant, green (Pb-free, no Sb/Br), moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supervisory circuit applications.

Compared with TPS3836E18QDBVRQ1, the TPS3838E18QDBVRQ1 provides essential bus-sharing capability via open-drain output, while TPS3838J25QDBVRQ1 shifts threshold to match higher-voltage rails-both retain identical nanosupply current, AEC-Q100 qualification, and CT-programmable delay.

Availability

TPS3838E18QDBVRQ1 is available at Aetrix Electronics and suitable for automotive ECUs, telematics control units, ADAS camera modules, and EV battery management sensor nodes requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TPS3838E18QDBVRQ1 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, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.

The TPS3838-Q1 family is designed specifically for automotive power-supply supervision, emphasizing nanosupply current, AEC-Q100 qualification, and flexible reset timing to meet stringent functional safety and reliability requirements.

FAQ

What is the exact reset threshold voltage of the TPS3838E18QDBVRQ1?

The TPS3838E18QDBVRQ1 has a nominal reset threshold voltage of 1.71 V, with a guaranteed range of 1.64 V to 1.76 V over temperature and process variation. This value is factory-trimmed and applies specifically to the E18 variant; other variants (e.g., J25, K33) have different thresholds.

Does the TPS3838E18QDBVRQ1 support manual reset functionality?

Yes, the TPS3838E18QDBVRQ1 includes a dedicated MR (Manual Reset) pin (Pin 3). It is an active-low input with internal ~30 kΩ pull-up; asserting MR low asynchronously forces RESET low regardless of VDD level, enabling system-level recovery without power cycle.

How is the reset delay time configured on the TPS3838E18QDBVRQ1?

The reset delay time on the TPS3838E18QDBVRQ1 is selected via the CT pin (Pin 1): connecting CT to GND yields a typical 10 ms delay, while connecting CT to VDD yields a typical 200 ms delay. No external components are required, and the pin draws less than 25 nA.

What is the maximum supply voltage rating for the TPS3838E18QDBVRQ1?

The absolute maximum supply voltage (VDD) for the TPS3838E18QDBVRQ1 is 7 V, but the recommended operating range is 1.6 V to 6 V. Operation at 7 V is limited to ≤1000 hours total to ensure long-term reliability per the datasheet's stress rating guidance.

Is the TPS3838E18QDBVRQ1 qualified for automotive applications?

Yes, the TPS3838E18QDBVRQ1 is AEC-Q100 Grade 1 qualified (−40°C to +125°C), features customer-specific configuration control, and is manufactured under TI's automotive quality management system. Its DBV package is rated MSL Level-1 with unlimited floor life at 260°C peak reflow.