Texas Instruments TPS389018QDSERQ1

Overview

TPS389018QDSERQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade voltage supervisor IC that monitors 1.8 V system rails with ±1% threshold accuracy (VITN = 1.73 V, VITP = 1.740 V), asserts open-drain RESET on undervoltage or manual reset, and supports user-programmable delay from 25 µs to 30 s via external CT capacitor - used in Delfino™ MCU power sequencing for infotainment and ADAS camera modules.

For engineers reviewing the TPS389018QDSERQ1 datasheet, TPS389018QDSERQ1 pinout, TPS389018QDSERQ1 application, or TPS389018QDSERQ1 equivalent, key selection criteria include its 2.1 µA quiescent current, –40°C to +125°C operating range, WSON-6 package, precision hysteresis (0.325–0.825%), and MR/SENSE/RESET timing behavior under transient conditions.

Technical Context

The TPS389018QDSERQ1 implements a precision bandgap reference and comparator architecture to achieve 1% total threshold accuracy over temperature, with separate negative (VITN) and positive (VITP) thresholds enabling robust hysteresis control. Its CT pin uses a 1.15 µA internal current source charging a user-supplied capacitor to set reset timeout, while internal pulldown resistance (200 Ω) discharges the capacitor during assertion.

It operates across 1.5 V to 5.5 V supply range independent of monitored rail voltage, accepts SENSE inputs up to 5.5 V, and features glitch immunity (≥9 µs at 5% overdrive) plus MR input with 0.25 × VDD logic-low threshold - all validated per AEC-Q100 Grade 1 requirements including HBM ±2 kV and CDM ±750 V ESD ratings.

Key Specifications

Pinout & Package

TPS389018QDSERQ1 is housed in a 1.5-mm × 1.5-mm WSON-6 package with wettable flanks, optimized for automated optical inspection (AOI) and space-constrained automotive PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS389018QDSERQ1, TPS389012QDSERQ1 serves different voltage domains and cannot substitute in 1.8 V applications, while MAX6373KATA+T sacrifices design flexibility (no MR, fixed delay) for slightly larger footprint and higher quiescent current - making TPS389018QDSERQ1 optimal for programmable, automotive-grade 1.8 V supervision.

Availability

TPS389018QDSERQ1 is available at Aetrix Electronics and suitable for infotainment head units, ADAS camera modules, and hybrid/digital clusters requiring stable component supply with AEC-Q100 compliance and long-term automotive lifecycle support.

Supply support for TPS389018QDSERQ1 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, industrial, and power management solutions.

TPS389018QDSERQ1 belongs to the TPS3890-Q1 family of low-quiescent-current supervisors designed specifically for automotive power-rail monitoring - emphasizing precision, programmability, and AEC-Q100 reliability in safety-critical subsystems.

FAQ

What is the exact threshold voltage monitored by TPS389018QDSERQ1?

The TPS389018QDSERQ1 monitors a nominal 1.8 V rail with a negative threshold (VITN) of 1.73 V and positive threshold (VITP) of 1.740 V, both specified with ±1% accuracy over –40°C to +125°C. This 10 mV hysteresis window ensures stable reset assertion/deassertion without oscillation during rail recovery. The values are factory-trimmed and documented in TI's SBVS303B datasheet, Table 5 (Device Comparison Table).

Does TPS389018QDSERQ1 support manual reset functionality?

Yes, TPS389018QDSERQ1 includes a dedicated MR (manual reset) input (Pin 3) that asserts RESET when driven to logic low (≤0.25 × VDD). When MR returns high and SENSE exceeds VITP, RESET remains low for the full CT-programmed delay before deasserting. If unused, MR must be tied to VDD. This feature enables external system-level reset coordination, such as ignition switch control or watchdog timeout signals.

What package type and dimensions does TPS389018QDSERQ1 use?

TPS389018QDSERQ1 uses the DSE (WSON-6) package: a 1.5-mm × 1.5-mm, 0.75-mm height, 6-pin leadless package with wettable flanks. It has a 0.5-mm pitch and conforms to JEDEC MO-229 standards. This compact, thermally efficient package supports automated optical inspection and is optimized for high-density automotive PCB layouts where space and thermal performance are critical.

How is the reset delay time programmed on TPS389018QDSERQ1?

The reset delay time on TPS389018QDSERQ1 is programmed by connecting an external capacitor between Pin 5 (CT) and GND. The delay (tPD(r)) follows tPD(r) = CCT × 1.07 + 25 µs (nominal), where CCT is in µF. For example, a 10 µF capacitor yields ~10.73 ms delay. TI recommends ceramic capacitors with low leakage; maximum supported value is 26 µF for 30 s delay. No resistor is required - timing is current-source based.

Is TPS389018QDSERQ1 qualified for automotive applications?

Yes, TPS389018QDSERQ1 is AEC-Q100 qualified for automotive applications, meeting Grade 1 requirements: ambient operating temperature –40°C to +125°C, HBM ESD ±2000 V, and CDM ESD ±750 V. It is explicitly listed in TI's TPS3890-Q1 product folder as qualified, and the "Q1" suffix denotes automotive qualification. Production data sheets (SBVS303B) confirm full characterization across temperature, voltage, and lifetime stress tests per AEC-Q100 standards.