Texas Instruments TPS3808G12DBVT

Overview

TPS3808G12DBVT from Texas Instruments is a low-quiescent-current, programmable-delay supervisory circuit designed to monitor 1.2 V system rails and assert an open-drain RESET signal when the SENSE voltage drops below 1.12 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-enabling reliable power-on reset in battery-powered microcontroller systems.

For engineers reviewing the TPS3808G12DBVT datasheet, TPS3808G12DBVT pinout, TPS3808G12DBVT application, or TPS3808G12DBVT equivalent, key selection considerations include its fixed 1.12 V threshold for 1.2 V rails, SOT-23-6 package compatibility with space-constrained PCBs, −40°C to 125°C operating range, and open-drain RESET output requiring external pull-up for interfacing with diverse logic families.

Technical Context

The TPS3808G12DBVT implements a precision voltage comparator with built-in hysteresis (1% of VIT) and an on-chip 220 nA current source that charges the external CT capacitor to set reset delay. Its SENSE input monitors rail voltage directly without external divider, while MR provides asynchronous reset initiation with 90 kΩ internal pull-up.

RESET assertion is governed by dual conditions: SENSE falling below 1.12 V or MR driven below 0.3×VDD; de-assertion requires both inputs to exceed their thresholds *and* completion of the programmed delay. The device operates across 1.7–6.5 V supply 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, surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G12DBVT, the DBVR offers identical performance in bulk packaging, while the MAX6326UT12+T trades programmability and MR support for lower cost and smaller footprint-making it suitable only for fixed-timing, MR-free designs.

Availability

TPS3808G12DBVT is available at Aetrix Electronics and suitable for microcontroller power-on reset, battery-powered sensor nodes, and FPGA configuration monitoring requiring stable component supply, long-lifecycle assurance, and automotive-grade temperature resilience.

Supply support for TPS3808G12DBVT 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, embedded processing, and connectivity solutions with over 90 years of innovation in power management and signal chain technologies.

The TPS3808 family was engineered specifically for ultra-low-power, high-accuracy voltage supervision in space- and energy-constrained systems-including portable electronics, automotive ECUs, and industrial edge controllers.

FAQ

What is the exact threshold voltage of the TPS3808G12DBVT?

The TPS3808G12DBVT has a factory-trimmed threshold voltage of 1.12 V, optimized for monitoring nominal 1.2 V power rails. This value is specified with ±0.5% typical accuracy across −40°C to 125°C and does not require external calibration or resistor dividers-ensuring repeatable reset behavior in production systems using the TPS3808G12DBVT.

How do I configure the reset delay time for the TPS3808G12DBVT?

The TPS3808G12DBVT reset delay is configured via the CT pin: leave CT open for 20 ms, connect CT to VDD through a 40–200 kΩ resistor for 300 ms, or connect CT to ground via a capacitor ≥100 pF for user-defined delays from 1.25 ms to 10 s. The TPS3808G12DBVT uses an internal 220 nA current source to charge the capacitor, making delay highly predictable and temperature-stable.

Does the TPS3808G12DBVT support manual reset functionality?

Yes, the TPS3808G12DBVT includes a dedicated MR (manual reset) input (Pin 3) that asserts RESET when driven below 0.3×VDD. MR features an internal 90 kΩ pull-up to VDD, allowing it to be left unconnected if unused. This enables hardware-initiated resets independent of SENSE voltage-critical for watchdog-triggered recovery or front-panel reset buttons in systems using the TPS3808G12DBVT.

What package type is used for the TPS3808G12DBVT?

The TPS3808G12DBVT uses the SOT-23-6 (DBV) package: a 2.90 mm × 1.60 mm surface-mount outline with gull-wing leads. It is RoHS-compliant, lead-free, and qualified for reflow soldering per JEDEC J-STD-020. This compact footprint supports high-density PCB layouts in portable and industrial applications where space is constrained-consistent with all TPS3808G12DBVT units shipped by Aetrix Electronics.

Can the TPS3808G12DBVT monitor voltages other than 1.2 V?

No-the TPS3808G12DBVT is factory-configured exclusively for 1.2 V rail monitoring with a fixed 1.12 V threshold. For adjustable or alternate fixed thresholds (e.g., 3.3 V or 5 V), TI offers other members of the family such as TPS3808G33 or TPS3808G01. Using the TPS3808G12DBVT outside its specified 1.2 V application violates its design intent and may result in incorrect reset timing or failure to assert RESET.