Texas Instruments TPS3809I50QDBVRQ1

Overview

TPS3809I50QDBVRQ1 from Texas Instruments is an automotive-grade 3-pin supply voltage supervisor IC that monitors 5 V system rails and asserts an active-low RESET signal when VDD drops below 4.55 V (±50 mV hysteresis). It delivers 9 μA typical supply current, features a fixed 200 ms power-on reset delay, and operates across −40°C to +125°C ambient temperature - enabling reliable power sequencing in engine control units and ADAS camera modules.

For engineers reviewing the TPS3809I50QDBVRQ1 datasheet, TPS3809I50QDBVRQ1 pinout, TPS3809I50QDBVRQ1 application, or TPS3809I50QDBVRQ1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, push-pull RESET output, 4.55 V threshold accuracy over temperature, and SOT-23 (DBV) 3-pin package compatibility with space-constrained automotive PCBs.

Technical Context

The TPS3809I50QDBVRQ1 integrates a precision voltage comparator with internal 1.137 V reference and hysteresis circuitry to detect undervoltage conditions on the VDD pin. Its internal oscillator-based timer ensures a guaranteed 120–280 ms reset assertion window after VDD rises above the 4.55 V threshold.

This device operates as a single-rail supervisor with no external components required: RESET remains low until VDD exceeds VIT− (4.55 V), then stays high until VDD falls below VIT− again. The push-pull output drives microcontroller reset inputs directly without pull-up resistors.

Key Specifications

Pinout & Package

SOT-23 (DBV) 3-pin package, 2.90 mm × 1.60 mm body size, 1.45 mm max height, RoHS-compliant, NIPDAU lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809E and TPS3809K33QDBVRQ1, the TPS3809I50QDBVRQ1 uniquely combines AEC-Q100 Grade 1 qualification, 4.55 V threshold accuracy over full automotive temperature range, and production-ready reliability - making it the sole validated option for 5 V rail supervision in safety-critical vehicle systems.

Availability

TPS3809I50QDBVRQ1 is available at Aetrix Electronics and suitable for automotive camera systems, engine control units, telematics control units, and instrument clusters requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TPS3809I50QDBVRQ1 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 ICs, embedded processors, and system solutions for industrial, automotive, and personal electronics markets.

The TPS3809-Q1 product line delivers AEC-Q100-qualified voltage supervisors optimized for automotive power sequencing, reset generation, and supply monitoring in harsh environments - targeting ADAS, powertrain, and body electronics.

FAQ

What is the exact reset threshold voltage of the TPS3809I50QDBVRQ1?

The TPS3809I50QDBVRQ1 has a nominal reset threshold voltage of 4.55 V, with a guaranteed range of 4.40 V to 4.65 V across the full −40°C to +125°C operating temperature range. This value is factory-trimmed and specified in Table 5-1 and Section 7.5 of the datasheet as VIT− for the I50 variant.

Does the TPS3809I50QDBVRQ1 require external components to function?

No, the TPS3809I50QDBVRQ1 requires no external components for basic operation. It integrates a precision voltage reference, comparator, hysteresis circuit, and 200 ms timer. TI recommends placing a 0.1 µF ceramic capacitor near the VDD pin for noise immunity, but this is optional for most stable 5 V rail applications.

Is the TPS3809I50QDBVRQ1 pin-compatible with MAX809?

Yes, the TPS3809I50QDBVRQ1 is explicitly stated as pin-for-pin compatible with MAX809 in the datasheet Features section. Both devices use the same SOT-23 (DBV) 3-pin package with identical pin 1 (GND), pin 2 (RESET), and pin 3 (VDD) assignments and push-pull output architecture.

What is the maximum supply voltage the TPS3809I50QDBVRQ1 can withstand?

The absolute maximum supply voltage for the TPS3809I50QDBVRQ1 is 6.5 V, as specified in Section 7.1 Absolute Maximum Ratings. For reliable long-term operation, TI recommends limiting continuous exposure to 6 V or below, as operation at 6.5 V is restricted to ≤1000 hours.

How does the TPS3809I50QDBVRQ1 behave during power-up?

During power-up, the TPS3809I50QDBVRQ1 asserts RESET low when VDD rises above 1.1 V. RESET remains low until VDD exceeds the 4.55 V threshold, then stays low for a fixed 200 ms delay before going high. This ensures the monitored 5 V rail is fully stabilized before releasing downstream logic from reset.