Texas Instruments TPS3808G33DBVTG4

Overview

TPS3808G33DBVTG4 from Texas Instruments is a low-quiescent-current, programmable-delay supervisory circuit designed to monitor 3.3-V system rails and assert an open-drain RESET signal when the SENSE voltage drops below 3.07 V or MR is pulled low. It delivers 0.5% threshold accuracy, 2.4 μA typical supply current, and user-adjustable reset delay from 1.25 ms to 10 s via external capacitor on CT pin - ideal for battery-powered microcontroller power-up sequencing.

For engineers reviewing the TPS3808G33DBVTG4 datasheet, TPS3808G33DBVTG4 pinout, TPS3808G33DBVTG4 application, or TPS3808G33DBVTG4 equivalent, key selection criteria include its fixed 3.07-V threshold, SOT-23-6 package compatibility, −40°C to 125°C operating range, and support for manual reset assertion and open-drain output interfacing with 3.3-V logic and higher-voltage reset buses.

Technical Context

The TPS3808G33DBVTG4 implements a precision voltage comparator with built-in hysteresis (1% of VIT) and an internal 220-nA current source that charges an external CT capacitor to generate the reset delay. Its SENSE input monitors 3.3-V rails directly without external dividers, while the MR pin supports active-low manual reset with 90-kΩ internal pull-up.

RESET assertion is triggered by either SENSE falling below 3.07 V or MR dropping below 0.3×VDD; de-assertion occurs only after both conditions clear and the programmed delay expires. The open-drain output requires an external pull-up resistor (10 kΩ–1 MΩ) and supports voltages up to 6.5 V, enabling interoperability with diverse host logic families.

Key Specifications

Pinout & Package

SOT-23-6 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads, RoHS-compliant lead finish (NIPDAU/SN), MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVTG4, the DBVR variant offers identical supervision performance with optimized logistics for volume manufacturing, while the MAX6326UT33+T trades flexibility (no MR, fixed delay) for lower current and smaller size - making it viable only in simplified, space-critical designs without manual reset needs.

Availability

TPS3808G33DBVTG4 is available at Aetrix Electronics and suitable for microcontroller power sequencing, battery-powered portable devices, FPGA configuration integrity, and industrial PLC I/O modules requiring stable component supply and long-term lifecycle support.

Supply support for TPS3808G33DBVTG4 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 for industrial, automotive, and personal electronics markets.

The TPS3808 family is engineered for precision power-supply monitoring in resource-constrained systems, emphasizing ultra-low quiescent current, high threshold accuracy, and flexible reset timing - targeting battery-operated and thermally demanding applications.

FAQ

What is the exact threshold voltage of the TPS3808G33DBVTG4 and how is it calibrated?

The TPS3808G33DBVTG4 has a nominal threshold voltage of 3.07 V, corresponding to 93% of a 3.3-V nominal rail. This value is factory-trimmed using TI's precision reference architecture, achieving ±0.5% accuracy over –40°C to 85°C. The device does not require external calibration; the threshold is fixed and guaranteed per datasheet Section 5 (Device Voltage Thresholds).

Can the TPS3808G33DBVTG4 be used to monitor voltages other than 3.3 V?

No - the TPS3808G33DBVTG4 is a fixed-threshold variant optimized exclusively for 3.3-V rails. To monitor other voltages, select alternate members of the family: TPS3808G12 for 1.2 V (1.12 V threshold), TPS3808G25 for 2.5 V (2.33 V), or TPS3808G01 for adjustable thresholds down to 0.405 V. Using TPS3808G33DBVTG4 on non-3.3-V rails risks incorrect reset assertion.

How do I configure the TPS3808G33DBVTG4 for a 300-ms reset delay?

To set a 300-ms reset delay on the TPS3808G33DBVTG4, connect the CT pin (Pin 4) to VDD through a resistor between 40 kΩ and 200 kΩ - 50 kΩ is commonly used. Do not connect a capacitor. This configuration activates the internal resistor-based timing path. Confirm operation using the timing diagram in Figure 7-1 and electrical characteristics in Section 7.6.

Does the TPS3808G33DBVTG4 support manual reset, and how is it implemented?

Yes, the TPS3808G33DBVTG4 supports manual reset via the MR pin (Pin 3). Driving MR low (< 0.3×VDD) immediately asserts RESET regardless of SENSE voltage. MR features a 90-kΩ internal pull-up to VDD, so it may be left unconnected if unused. For systems with open-collector logic or incomplete voltage swing, add an external MOSFET as shown in Figure 8-4 to avoid excess current draw.

What package type and footprint does the TPS3808G33DBVTG4 use?

The TPS3808G33DBVTG4 uses the SOT-23-6 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm maximum height, gull-wing leads with 0.95 mm pitch. It shares footprint compatibility with other DBV-packaged TI supervisors like TPS3801 and TLV809. PCB layout must include thermal relief on GND and a 0.1-μF ceramic capacitor within 2 mm of VDD.