Texas Instruments TPS3808EG30DBVRQ1

Overview

TPS3808EG30DBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade microprocessor supervisory circuit that monitors 3.0V system rails with ±0.5% threshold accuracy (2.79V nominal), asserts an open-drain RESET signal on undervoltage or manual reset, and provides user-programmable delay from 1.25ms to 150s via external capacitor. It operates from –40°C to +125°C and draws only 0.6μA typical quiescent current, enabling use in battery-sensitive ADAS domain controllers.

For engineers reviewing the TPS3808EG30DBVRQ1 datasheet, TPS3808EG30DBVRQ1 pinout, TPS3808EG30DBVRQ1 application, or TPS3808EG30DBVRQ1 equivalent, key selection considerations include its fixed 3.0V monitoring threshold, SOT-23-6 package compatibility, CT-pin programmable reset timing, separate SENSE/VDD pins for rail isolation, and AEC-Q100 qualification for automotive safety-critical power sequencing.

Technical Context

The TPS3808EG30DBVRQ1 implements a precision voltage comparator with 0.5% threshold accuracy referenced to an internal bandgap, hysteresis of 1–2.5% of V_IT, and glitch immunity of 5µs on SENSE and 50ns on MR. Its reset assertion logic follows a strict truth table where RESET goes low if either SENSE < V_IT or MR = low, and remains low for the full programmed delay after both conditions clear.

Reset delay is generated by an internal 220nA current source charging an external capacitor connected to the CT pin; discharge occurs during fault, requiring sufficient fault duration for full capacitor discharge to ensure accurate timing. The open-drain RESET output requires an external pull-up (10kΩ–1MΩ) and supports voltages up to 6V, decoupled from VDD.

Key Specifications

Pinout & Package

TPS3808EG30DBVRQ1 is housed in a 6-pin SOT-23 package (2.90mm × 1.60mm), optimized for space-constrained automotive PCBs and compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808EG30DBVRQ1, TPS3808G30DBVRQ1 trades AEC-Q100 qualification and tighter threshold accuracy for lower cost, while MAX6373HETA+ offers simpler fixed-timing implementation at the expense of programmability and higher quiescent current-making TPS3808EG30DBVRQ1 optimal for new ASIL-B–aligned designs requiring precision, flexibility, and ultra-low power.

Availability

TPS3808EG30DBVRQ1 is available at Aetrix Electronics and suitable for ADAS domain controllers, automotive gateways, and digital cockpit processing units requiring stable component supply across extended automotive lifecycles.

Supply support for TPS3808EG30DBVRQ1 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 and embedded processing solutions, with deep expertise in automotive electronics and functional safety compliance.

The TPS3808E-Q1 product line was designed specifically for automotive power supervision, targeting ASIL-B–capable systems needing precise, low-power, AEC-Q100–qualified reset generation in harsh thermal and electrical environments.

FAQ

What is the exact threshold voltage and accuracy of TPS3808EG30DBVRQ1?

The TPS3808EG30DBVRQ1 has a nominal threshold voltage of 2.79V with ±0.5% accuracy over –40°C to +125°C. This corresponds to the 3.0V nominal supply rail and is achieved using a precision internal reference. The device does not require external resistors to set this threshold, eliminating tolerance errors from external components. This specification is confirmed in the Electrical Characteristics table of the official TI datasheet SBVS430C.

How is reset delay configured on TPS3808EG30DBVRQ1?

Reset delay on TPS3808EG30DBVRQ1 is configured via the CT pin: leaving it open yields ~20ms, connecting it to VDD through a 40–200kΩ resistor yields ~300ms, and connecting it to GND through a capacitor (≥130pF) enables user-programmable delays from 1.25ms to 150s. The delay is generated by an internal 220nA current source charging the capacitor. This behavior is documented in Section 6.6 and Figure 8-2 of the TPS3808EG30DBVRQ1 datasheet.

Does TPS3808EG30DBVRQ1 support monitoring a different voltage rail than its supply voltage?

Yes, TPS3808EG30DBVRQ1 supports independent rail monitoring via its dedicated SENSE pin, which is electrically isolated from the VDD supply pin. This allows monitoring of a 3.0V rail (e.g., MCU I/O) while powering the supervisor from a separate 5V domain. The SENSE input draws ≤25nA, minimizing loading on the monitored rail. This architecture is explicitly described in the Functional Block Diagram and Pin Functions table of the TPS3808EG30DBVRQ1 datasheet.

What is the maximum operating voltage for the RESET output of TPS3808EG30DBVRQ1?

TPS3808EG30DBVRQ1's RESET output is an open-drain structure rated for up to 6V, independent of the VDD supply voltage. This allows the RESET signal to interface with higher-voltage logic families (e.g., 5V microcontrollers) or be pulled up to a separate supply rail. A pull-up resistor between 10kΩ and 1MΩ is required, and VOL remains ≤400mV at 1mA sink current. These limits are specified in Sections 6.1 and 6.5 of the TPS3808EG30DBVRQ1 datasheet.

Is TPS3808EG30DBVRQ1 qualified for automotive use, and what grade does it meet?

Yes, TPS3808EG30DBVRQ1 is AEC-Q100 qualified and meets Grade 1 requirements (–40°C to +125°C operating junction temperature). It has passed stress testing including HTOL, TC, UHAST, and ESD per AEC-Q100 standards. This qualification is stated in the Features section and validated across all electrical parameters in the Recommended Operating Conditions table of the TPS3808EG30DBVRQ1 datasheet.