Texas Instruments TPS3808G33DBVT

Overview

TPS3808G33DBVT from Texas Instruments is a low-quiescent-current, fixed-threshold supervisory circuit designed to monitor 3.3-V power rails and assert an open-drain RESET signal when the SENSE voltage falls below 3.07 V. It delivers 0.5% threshold accuracy, 2.4 μA typical supply current, and user-programmable reset delay from 1.25 ms to 10 s via external capacitor on CT pin. It is used in microcontroller power sequencing and FPGA configuration integrity assurance.

For engineers reviewing the TPS3808G33DBVT datasheet, TPS3808G33DBVT pinout, TPS3808G33DBVT application, or TPS3808G33DBVT equivalent, key selection criteria include its 3.07-V fixed threshold, SOT-23-6 package compatibility, open-drain RESET output with 0.4-V max VOL at 1 mA, –40°C to 125°C operating range, and programmable delay timing architecture using internal 220-nA current source charging CT.

Technical Context

The TPS3808G33DBVT implements a precision voltage comparator with built-in hysteresis (1% of VIT) and a monostable delay timer controlled by an on-chip 220-nA current source charging the external CT capacitor. Its SENSE input monitors system voltage directly without external resistive dividers, and MR provides asynchronous manual reset with 90-kΩ internal pull-up.

RESET assertion occurs when either SENSE drops below 3.07 V or MR is driven below 0.3×VDD; de-assertion requires both inputs to exceed their thresholds and the full delay period to elapse. The device operates across 1.7–6.5 V supply range and maintains 2.4 μA quiescent current regardless of CT configuration.

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 NIPDAU finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVT, TPS3808G33DBVR offers identical functionality in volume packaging, while MAX6326LT33D2T trades programmability and MR support for lower IQ and simpler layout-making it viable only in fixed-timing, space-constrained applications where flexibility is secondary.

Availability

TPS3808G33DBVT is available at Aetrix Electronics and suitable for microcontroller power sequencing, FPGA configuration integrity, and battery-powered sensor node applications requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TPS3808G33DBVT 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The TPS3808 family was engineered specifically for ultra-low-power, high-accuracy power-supply monitoring in battery-critical and thermally demanding systems-emphasizing precision threshold stability, flexible delay timing, and robust operation across extended temperature ranges.

FAQ

What is the exact threshold voltage of the TPS3808G33DBVT?

The TPS3808G33DBVT has a nominal threshold voltage of 3.07 V with ±0.5% accuracy over –40°C to 125°C. This value is factory-trimmed and applies specifically to the G33 variant; it is not adjustable and does not require external components to achieve rated accuracy. The TPS3808G33DBVT achieves this precision using an internal bandgap reference and laser-trimmed resistors, ensuring consistent trip points across production lots and temperature extremes.

Can the TPS3808G33DBVT monitor voltages other than 3.3 V?

No-the TPS3808G33DBVT is a fixed-threshold device optimized exclusively for 3.3-V rail monitoring at 3.07 V. To supervise other voltages, select alternate variants such as TPS3808G12 (1.12 V) or TPS3808G25 (2.33 V), or use the adjustable TPS3808G01 with external resistor divider. The TPS3808G33DBVT lacks internal scaling circuitry and cannot be reconfigured for different thresholds; attempting to apply non-3.3-V supplies to SENSE may cause incorrect reset behavior or violate absolute maximum ratings.

How do I configure the reset delay time on the TPS3808G33DBVT?

Configure the reset delay by connecting a capacitor between CT (pin 4) and GND: values from 100 pF to 180 nF yield delays from 1.25 ms to 10 s per the formula t_D = C_T(nF) × 10⁻³ + 0.5 ms. Leaving CT open gives 20 ms; tying CT to VDD via 40–200 kΩ yields 300 ms. The TPS3808G33DBVT uses an internal 220-nA current source to charge CT, so capacitor leakage must be <1 nA-use X7R or C0G ceramics. Avoid PCB traces longer than 5 mm to minimize stray capacitance affecting timing accuracy.

Is the MR pin required for normal operation of the TPS3808G33DBVT?

No-the MR pin is optional and can be left unconnected. The TPS3808G33DBVT includes a 90-kΩ internal pull-up resistor to VDD, so MR defaults to logic high and does not affect RESET unless actively driven low. If used, MR must be driven below 0.3×VDD to assert reset; no external pull-up is needed. In systems where manual reset is unnecessary-such as standalone microcontroller boards-the TPS3808G33DBVT functions fully with MR floating, simplifying layout and reducing BOM count.

What package type is used by the TPS3808G33DBVT?

The TPS3808G33DBVT uses the SOT-23-6 (DBV) package: 2.90 mm × 1.60 mm body size, 0.95 mm maximum height, gull-wing leads, and RoHS-compliant NIPDAU lead finish. It is distinct from the WSON-6 (DRV) variant and not interchangeable without PCB redesign. The DBV package supports standard reflow profiles (MSL Level-1, peak 260°C) and is compatible with automated pick-and-place equipment. Thermal resistance is R_θJA = 180.9°C/W, requiring adequate copper pour on GND for high-temperature operation.