Texas Instruments TPS3808G12DRVT

Overview

TPS3808G12DRVT 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. 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 and FPGA applications.

For engineers reviewing the TPS3808G12DRVT datasheet, TPS3808G12DRVT pinout, TPS3808G12DRVT application, or TPS3808G12DRVT equivalent, key selection considerations include its fixed 1.12 V threshold for 1.2 V rails, SOT-23-6 package compatibility, −40°C to 125°C operating range, open-drain RESET output requiring external pull-up, and manual reset (MR) input with 90 kΩ internal pull-up.

Technical Context

The TPS3808G12DRVT implements a precision voltage comparator with built-in hysteresis (1% of VIT) and a programmable timer driven by a 220 nA on-chip current source charging the CT pin capacitor. Its SENSE input monitors rail voltage directly without external divider, while MR provides asynchronous reset initiation independent of supply monitoring.

RESET assertion is determined by logical OR of SENSE < 1.12 V or MR low; de-assertion requires both SENSE > 1.12 V + hysteresis and MR high, followed by the full programmed delay. The device operates across 1.7 V–6.5 V VDD and maintains stable performance over temperature due to its trimmed bandgap reference.

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 matte tin lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G12DRVT, TPS3808G12DBVR offers identical supervision performance in a standard SOT-23 reel format, while MAX6326LT12D3+T trades programmability and MR support for compact size-making it suitable only for fixed-timing, space-constrained designs without manual reset needs.

Availability

TPS3808G12DRVT is available at Aetrix Electronics and suitable for microcontroller power sequencing, FPGA configuration monitoring, battery-powered sensor nodes, automotive body control modules, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3808G12DRVT 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 microcontrollers.

The TPS3808 family is engineered for high-accuracy, low-power system supervision in space- and energy-constrained applications-including portable electronics, automotive subsystems, and industrial edge devices-where deterministic reset behavior and long-term reliability are critical.

FAQ

What is the exact threshold voltage of the TPS3808G12DRVT and how is it specified?

The TPS3808G12DRVT has a nominal threshold voltage of 1.12 V, corresponding to a 1.2 V supply rail. This value is factory-trimmed with ±0.5% accuracy over −40°C to 125°C, as confirmed in TI's SBVS050M datasheet Table 5. The device achieves this precision using a bandgap reference and laser-trimmed resistors, ensuring minimal variation across temperature and process corners without external calibration.

Can the TPS3808G12DRVT be used to monitor voltages other than 1.2 V?

No-the TPS3808G12DRVT is a fixed-threshold variant optimized exclusively for 1.2 V rails. Its internal reference and comparator are trimmed to assert RESET when SENSE falls below 1.12 V. For adjustable thresholds, TI offers the TPS3808G01, which supports user-defined thresholds down to 0.405 V via external resistor divider-but that part is not functionally interchangeable with the TPS3808G12DRVT.

What is the recommended pull-up resistor value for the open-drain RESET output of the TPS3808G12DRVT?

Texas Instruments specifies a pull-up resistor between 10 kΩ and 1 MΩ for the TPS3808G12DRVT RESET pin. A 100 kΩ resistor is commonly used to balance rise time (<1 μs with 50 pF load) and current consumption (<33 μA at 3.3 V). Values below 10 kΩ risk exceeding the 5 mA sink limit during assertion; values above 1 MΩ increase susceptibility to noise and slow rise times in noisy environments.

Does the TPS3808G12DRVT support operation below 1.7 V supply voltage?

No-the TPS3808G12DRVT has a minimum operating VDD of 1.7 V per Section 7.3 of the datasheet. Below this, the internal reference and comparator cannot maintain specification: RESET behavior becomes undefined, threshold accuracy degrades, and quiescent current may rise unpredictably. For sub-1.7 V supervision, consider TI's TPS3809 series, which operates down to 0.9 V but lacks programmable delay.

How does the CT pin configuration affect reset delay time in the TPS3808G12DRVT?

The CT pin on the TPS3808G12DRVT sets reset delay via three configurations: open circuit yields 20 ms, connection to VDD through 40–200 kΩ yields 300 ms, and connection to GND via capacitor ≥100 pF yields programmable delay from 1.25 ms to 10 s. The delay is generated by a 220 nA internal current source charging the capacitor to 1.23 V; ceramic capacitors are required to minimize leakage-induced timing error.