Texas Instruments TPS3808EG01DBVRQ1

Overview

TPS3808EG01DBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade programmable supervisory circuit that monitors system voltages down to 0.405 V with ±1% typical threshold accuracy, delivers 0.6 µA typical quiescent current, supports user-adjustable reset delay from 1.25 ms to 150 s via external capacitor, and asserts an open-drain RESET signal upon undervoltage or manual reset-used in ADAS domain controllers and digital cockpit processing units.

For engineers reviewing the TPS3808EG01DBVRQ1 datasheet, TPS3808EG01DBVRQ1 pinout, TPS3808EG01DBVRQ1 application, or TPS3808EG01DBVRQ1 equivalent, key selection considerations include its adjustable 0.405 V sense threshold, SOT-23-6 package compatibility with space-constrained automotive PCBs, CT-pin-based timing configuration, MR input for system-initiated reset, and guaranteed operation from –40°C to +125°C junction temperature.

Technical Context

The TPS3808EG01DBVRQ1 implements a precision bandgap reference and comparator architecture to achieve 0.5% threshold accuracy and 1–2.5% hysteresis, enabling robust undervoltage detection across wide temperature ranges. Its internal 220 nA CT-current source charges an external capacitor to set reset delay, with glitch immunity of 5 µs on SENSE and 50 ns on MR.

It operates over 1.7 V to 6 V supply voltage, supports independent SENSE and VDD pins for rail monitoring flexibility, features a 90 kΩ internal MR pull-up resistor, and uses open-drain RESET output requiring external pull-up (10 kΩ–1 MΩ) to interface with microprocessor reset inputs up to 6 V.

Key Specifications

Pinout & Package

TPS3808EG01DBVRQ1 is housed in a 6-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for high-density automotive PCB layouts with minimal footprint and thermal resistance (R_θJA = 210.8°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808EG01DBVRQ1, the TPS3808G33DBVRQ1 trades adjustability for tighter threshold tolerance on 3.3 V rails, while the MAX6373AUT+T offers lower design complexity at the expense of automotive qualification, programmability, and ultra-low power performance.

Availability

TPS3808EG01DBVRQ1 is available at Aetrix Electronics and suitable for ADAS domain controllers, digital cockpit processing units, and telematics control units requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.

Supply support for TPS3808EG01DBVRQ1 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 ICs.

The TPS3808E-Q1 product line delivers ultra-low-power, AEC-Q100-qualified supervisory circuits designed specifically for safety-critical automotive subsystems requiring precise voltage monitoring and configurable reset timing.

FAQ

What is the exact threshold voltage of TPS3808EG01DBVRQ1, and how is it implemented?

The TPS3808EG01DBVRQ1 has a nominal threshold voltage of 0.405 V, implemented via an internal precision reference and comparator. This fixed value applies to the adjustable version and enables direct monitoring of ultra-low-voltage rails without external components. Threshold accuracy is ±1% typical over temperature, verified per AEC-Q100 test conditions. The 0.405 V trip point is factory-trimmed and does not require user calibration or resistor networks.

How does the CT pin configure reset delay in TPS3808EG01DBVRQ1?

The CT pin on TPS3808EG01DBVRQ1 controls reset delay via three configurations: open circuit yields 20 ms, connection to VDD through 40–200 kΩ yields 300 ms, and connection to ground via capacitor (≥130 pF) enables user-programmable delay from 1.25 ms to 150 s. An internal 220 nA current source charges the capacitor; delay time is calculated as t_D(s) = (C_T(nF) × 10⁻⁹) / (220 × 10⁻⁹) + 0.5 × 10⁻³. Stray capacitance must be minimized to maintain timing accuracy.

Does TPS3808EG01DBVRQ1 support monitoring multiple voltage rails?

Yes, TPS3808EG01DBVRQ1 supports multi-rail monitoring through its dedicated SENSE pin and MR input. While only one rail is monitored directly via SENSE, the MR pin can be driven low by external logic (e.g., output of another supervisor) to assert RESET when any monitored rail fails. TI's application diagrams show cascading multiple TPS3808E-Q1 devices-such as TPS3808EG12DBVRQ1 for 1.2 V and TPS3808EG33DBVRQ1 for 3.3 V-with MR outputs feeding into a common TPS3808EG01DBVRQ1 to consolidate reset signaling.

What is the maximum allowable voltage on the RESET pin of TPS3808EG01DBVRQ1?

The RESET pin of TPS3808EG01DBVRQ1 is an open-drain output rated for up to 6 V, allowing it to interface with microprocessors or FPGAs operating at higher I/O voltages than VDD. When asserted, RESET sinks current up to 5 mA with VOL ≤ 400 mV at 1 mA load. External pull-up resistors (10 kΩ to 1 MΩ) must be used, and the pull-up voltage may exceed VDD-enabling level translation without additional components. Absolute maximum rating for RESET pin voltage is 6.5 V.

Is TPS3808EG01DBVRQ1 qualified for automotive safety standards like ISO 26262?

TPS3808EG01DBVRQ1 is AEC-Q100 Grade 1 qualified (–40°C to +125°C), but it is not ASIL-certified or ISO 26262-ready out-of-the-box. It serves as a foundational building block in safety architectures-for example, used in conjunction with ASIL-B MCUs to implement diagnostic supervision. TI provides failure-in-time (FIT) data and functional safety documentation (e.g., FMEDA reports) for integration into ISO 26262-compliant systems, though system-level certification remains the responsibility of the end designer.