Texas Instruments TPS3808G19DBVR

Overview

TPS3808G19DBVR from Texas Instruments is a low-quiescent-current, programmable-delay supervisory circuit designed to monitor 1.9 V system rails and assert an open-drain RESET signal when the SENSE voltage drops below 1.77 V or upon manual reset activation. It delivers 0.5% threshold accuracy, 2.4 μA typical supply current, and user-adjustable reset delay from 1.25 ms to 10 s-enabling reliable power-on reset in battery-powered microcontroller systems.

For engineers reviewing the TPS3808G19DBVR datasheet, TPS3808G19DBVR pinout, TPS3808G19DBVR application, or TPS3808G19DBVR equivalent, key selection criteria include its fixed 1.77 V threshold for 1.9 V rails, SOT-23-6 package compatibility, open-drain RESET output with external pull-up support up to 6.5 V, and operation across –40°C to 125°C industrial temperature range.

Technical Context

The TPS3808G19DBVR 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 logic-level manual reset with 90 kΩ internal pull-up.

RESET assertion is triggered by either SENSE falling below 1.77 V or MR pulled low; de-assertion occurs only after both conditions clear and the programmed delay expires. The device operates from 1.7 V to 6.5 V supply and maintains stable performance across full temperature range with no external components required for basic 20 ms or 300 ms delays.

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 TPS3808G19DBVR, TPS3808G18DBVR serves adjacent voltage rails but risks undershoot-triggered resets on 1.9 V systems, while MAX6326UT19+T trades configurability for simpler fixed-function implementation-making TPS3808G19DBVR optimal for designs needing precision 1.9 V monitoring with adaptive timing and manual intervention capability.

Availability

TPS3808G19DBVR is available at Aetrix Electronics and suitable for microcontroller power-on reset, battery-powered portable devices, and FPGA configuration sequencing requiring stable component supply, long-lifecycle assurance, and industrial-temperature-grade reliability.

Supply support for TPS3808G19DBVR 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, with leadership in power management, signal chain, and high-reliability ICs for industrial, automotive, and consumer markets.

The TPS3808 family was engineered specifically for ultra-low-power, high-accuracy voltage supervision in space-constrained and energy-sensitive applications-emphasizing precision thresholding, minimal quiescent draw, and flexible reset timing without external active components.

FAQ

What is the exact threshold voltage of the TPS3808G19DBVR?

The TPS3808G19DBVR has a nominal threshold voltage (V_IT) of 1.77 V, optimized for monitoring 1.9 V supply rails. This value is factory-trimmed with ±0.5% typical accuracy across –40°C to 125°C, eliminating need for external calibration or resistor dividers in standard 1.9 V applications.

How is the reset delay time configured on the TPS3808G19DBVR?

The TPS3808G19DBVR reset delay is set via the CT pin: leaving CT open yields 20 ms, connecting CT to VDD through a 40–200 kΩ resistor gives 300 ms, and attaching a ≥100 pF capacitor from CT to GND enables user-programmable delays from 1.25 ms to 10 s using the internal 220 nA current source.

Does the TPS3808G19DBVR require external components for basic operation?

No-TPS3808G19DBVR operates with zero external components for fixed 20 ms delay (CT open) or 300 ms delay (CT to VDD). Only a 0.1 μF VDD decoupling capacitor and RESET pull-up resistor (10 kΩ–1 MΩ) are recommended for robustness; no divider, op-amp, or timing RC network is needed.

Can the TPS3808G19DBVR monitor voltages other than 1.9 V?

The TPS3808G19DBVR is factory-set for 1.77 V threshold and is not adjustable-its internal reference is trimmed specifically for 1.9 V rails. To monitor other voltages, select alternate variants (e.g., TPS3808G12 for 1.2 V) or use the adjustable TPS3808G01 with external resistor divider.

What package type does the TPS3808G19DBVR use, and is it RoHS-compliant?

The TPS3808G19DBVR uses the SOT-23-6 (DBV) package: 2.90 mm × 1.60 mm body, surface-mount, lead-free, and RoHS-compliant. It is rated for moisture sensitivity level (MSL) 1 at 260°C peak reflow, supporting standard automated PCB assembly processes.