Texas Instruments TPS3808G18DRVT

Overview

TPS3808G18DRVT from Texas Instruments is a low-quiescent-current, programmable-delay supervisory circuit designed to monitor 1.8-V system rails and assert an open-drain RESET signal upon undervoltage or manual reset. It delivers 0.5% threshold accuracy, 2.4 μA typical supply current, and user-adjustable delay from 1.25 ms to 10 s. It is deployed in battery-powered microcontroller systems requiring precise power-on reset timing.

For engineers reviewing the TPS3808G18DRVT datasheet, TPS3808G18DRVT pinout, TPS3808G18DRVT application, or TPS3808G18DRVT equivalent, key selection criteria include its 1.67-V fixed threshold (±0.5% over –40°C to 125°C), SOT-23-6 package compatibility, open-drain RESET output with 0.4-V max VOL at 1 mA, and CT-pin programmability for delay tuning without external logic.

Technical Context

The TPS3808G18DRVT implements a precision voltage comparator with built-in hysteresis (1% VIT) and an on-chip 220-nA current source that charges an external capacitor on the CT pin to control reset timeout. Its SENSE input monitors the 1.8-V rail directly, while MR provides asynchronous reset initiation with 90-kΩ internal pull-up.

It operates across 1.7–6.5 V supply range and supports three delay modes: 20 ms (CT open), 300 ms (CT tied to VDD via 40–200-kΩ resistor), or programmable (CT to ≥100-pF capacitor). RESET deassertion requires both SENSE > VIT + VHYS and MR high, followed by full delay expiration.

Key Specifications

Pinout & Package

TPS3808G18DRVT is packaged in a 6-pin SOT-23 (DBV) with 2.90 mm × 1.60 mm body size and standard JEDEC MO-178 footprint. Pin 1 is RESET; pin 2 is GND; pin 3 is MR; pin 4 is CT; pin 5 is SENSE; pin 6 is VDD.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G18DRVT, TPS3808G18DBVR offers identical performance in volume-friendly packaging, while MAX6326UT18+T trades programmability and manual reset for ultra-compact size and simpler layout-making it suitable only when delay and MR features are unnecessary.

Availability

TPS3808G18DRVT is available at Aetrix Electronics and suitable for microcontroller power sequencing, battery-powered IoT sensor nodes, FPGA configuration assurance, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3808G18DRVT 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 voltage monitoring in resource-constrained systems, emphasizing ultra-low power, high threshold accuracy, and flexible reset timing to simplify power management in portable and ruggedized electronics.

FAQ

What is the exact threshold voltage and accuracy of TPS3808G18DRVT?

The TPS3808G18DRVT has a nominal threshold voltage of 1.67 V with ±0.5% typical accuracy over –40°C to 125°C. This specification applies specifically to the G18 variant and is validated per TI's SBVS050M datasheet Section 5. The 0.5% tolerance ensures robust operation across automotive and industrial temperature extremes without derating.

How is the reset delay configured on TPS3808G18DRVT?

The reset delay on TPS3808G18DRVT 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; connecting CT to a ≥100-pF capacitor to GND enables programmable delay from 1.25 ms to 10 s. Equation 1 in the datasheet (CT = (tD + 0.5) × 10³ nF) defines the exact capacitor value required for a target delay.

Does TPS3808G18DRVT support manual reset functionality?

Yes, TPS3808G18DRVT includes a dedicated MR (manual reset) input (Pin 3) that asserts RESET immediately when driven to ≤0.3×VDD. An internal 90-kΩ pull-up resistor allows MR to be left unconnected if not used. This feature enables external processors or push-button circuits to initiate system reset independently of the monitored 1.8-V rail.

What package type and pin count does TPS3808G18DRVT use?

TPS3808G18DRVT uses the SOT-23-6 (DBV) package with 2.90 mm × 1.60 mm body dimensions and standard JEDEC MO-178 footprint. It has six pins: RESET, GND, MR, CT, SENSE, and VDD - matching the pinout shown in Figure 6-1 of the official datasheet. This package is compatible with standard reflow profiles and automated placement equipment.

Can TPS3808G18DRVT monitor voltages other than 1.8 V?

No - TPS3808G18DRVT is factory-trimmed for a fixed 1.67-V threshold optimized for 1.8-V nominal rails. To monitor other voltages, select alternate variants (e.g., TPS3808G33 for 3.3 V or TPS3808G01 for adjustable thresholds). Using TPS3808G18DRVT outside its specified 1.67-V threshold would violate its design intent and invalidate accuracy guarantees.