Texas Instruments TPS389033QDSERQ1

Overview

TPS389033QDSERQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade voltage supervisor IC that monitors 3.3 V system rails with ±1% threshold accuracy (VITN = 3.17 V, VITP = 3.189 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 - deployed in ADAS cameras and infotainment head units.

For engineers reviewing the TPS389033QDSERQ1 datasheet, TPS389033QDSERQ1 pinout, TPS389033QDSERQ1 application, or TPS389033QDSERQ1 equivalent, key selection criteria include its 2.1 µA quiescent current, –40°C to +125°C operation, WSON-6 package, precision hysteresis (0.325–0.825%), and MR/SENSE/RESET timing behavior under automotive transient conditions.

Technical Context

The TPS389033QDSERQ1 implements a precision bandgap reference and comparator architecture to achieve 1% threshold accuracy across –40°C to +125°C, with separate negative (VITN) and positive (VITP) thresholds enabling clean reset assertion/deassertion without chatter. Its CT pin uses a 1.15 µA internal current source charging an external capacitor to set delay time, while internal pulldown resistance (200 Ω) discharges it during reset assertion.

It operates from 1.5 V to 5.5 V supply, accepts SENSE inputs up to 5.5 V independent of VDD, and features glitch immunity (≥9 µs at 5% overdrive) plus MR input with 0.25×VDD low-level threshold. The open-drain RESET output requires an external pullup (10 kΩ–1 MΩ) and supports interface voltages up to 5.5 V regardless of VDD.

Key Specifications

Pinout & Package

TPS389033QDSERQ1 is housed in a 1.5-mm × 1.5-mm WSON-6 package with wettable flanks, optimized for automated optical inspection (AOI) and high-density automotive PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS389033QDSERQ1, TPS389033G-Q1 offers tighter margin for marginal 3.3 V rails, while TPS389033K-Q1 provides maximum noise immunity at the cost of reduced undervoltage sensitivity - both share identical pinout, delay programming, and AEC-Q100 Grade 1 qualification.

Availability

TPS389033QDSERQ1 is available at Aetrix Electronics and suitable for ADAS camera modules, infotainment head units, and hybrid digital clusters requiring stable component supply with automotive-grade traceability and extended temperature support.

Supply support for TPS389033QDSERQ1 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 delivering analog and embedded processing solutions, with leadership in automotive, industrial, and power management ICs.

The TPS3890-Q1 product line delivers ultra-low-power, high-accuracy voltage supervision for automotive ECUs - designed specifically for AEC-Q100 Grade 1 environments where reliability, precision, and long-term supply stability are critical.

FAQ

What is the exact threshold voltage specification for TPS389033QDSERQ1?

The TPS389033QDSERQ1 has a negative threshold voltage (VITN) of 3.17 V and a positive threshold voltage (VITP) of 3.189 V, with guaranteed ±1% accuracy over –40°C to +125°C. These values are factory-trimmed and documented in the Device Comparison Table of the SBVS303B datasheet. The 0.575% hysteresis ensures stable reset assertion/deassertion without oscillation during rail recovery.

How is the reset delay time programmed on TPS389033QDSERQ1?

The reset delay time on TPS389033QDSERQ1 is set by connecting an external capacitor between the CT pin and GND. Using the formula tPD(r) = CCT × 1.07 + 25 µs (nominal), a 100-nF capacitor yields ~110 µs delay, while a 22-µF capacitor achieves ~23.6 ms. The CT pin draws 1.15 µA to charge the capacitor, and internal 200-Ω pulldown discharges it during reset assertion.

Does TPS389033QDSERQ1 support monitoring voltages other than 3.3 V?

Yes - while TPS389033QDSERQ1 is optimized for 3.3 V rails, its SENSE pin accepts 0–5.5 V inputs independent of VDD. For non-3.3 V rails, use the adjustable TPS389001-Q1 variant with external resistor divider. The fixed-threshold TPS389033QDSERQ1 itself cannot monitor voltages outside its 3.17 V/3.189 V window without external scaling circuitry.

What is the recommended pullup resistor value for the RESET pin of TPS389033QDSERQ1?

The RESET pin of TPS389033QDSERQ1 requires an external pullup resistor between 10 kΩ and 1 MΩ, as specified in Section 7.3 of the datasheet. A 100-kΩ resistor is commonly used to balance speed (lower R) and power (higher R). The choice depends on bus capacitance and required rise time - for 100 pF load, 100 kΩ gives ~11 µs rise time (10%–90%) with VOL ≤ 0.25 V at 0.4 mA sink.

Is TPS389033QDSERQ1 pin-compatible with other devices in the TPS3890-Q1 family?

Yes - all TPS3890-Q1 variants, including TPS389033QDSERQ1, TPS389012-Q1, and TPS389018-Q1, share identical WSON-6 (DSE) package, pinout, and functional interface. Only the factory-set threshold voltages differ; CT delay programming, MR behavior, RESET drive strength, and electrical specs remain consistent across the family.