Texas Instruments TPS3808G33DRVT

Overview

TPS3808G33DRVT from Texas Instruments is a low-quiescent-current, fixed-threshold supervisory circuit designed to monitor 3.3-V system rails and assert an open-drain RESET signal when the SENSE voltage drops below 3.07 V or the MR pin is pulled low. 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 battery-powered embedded systems.

For engineers reviewing the TPS3808G33DRVT datasheet, TPS3808G33DRVT pinout, TPS3808G33DRVT application, or TPS3808G33DRVT 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 support for manual reset assertion and transient-immune SENSE monitoring.

Technical Context

The TPS3808G33DRVT implements a precision voltage comparator with built-in hysteresis (1% of VIT) and an on-chip 220-nA current source that charges an external CT capacitor to set reset delay. Its SENSE input monitors 3.3-V rails directly without external dividers, while MR provides asynchronous reset initiation with 90-kΩ internal pull-up.

RESET deassertion requires both SENSE > VIT + VHYS and MR high, followed by a precise delay determined by CT capacitance. The device operates across 1.7–6.5 V supply range, maintains 2.4 μA quiescent current at 3.3 V, and guarantees 0.5% threshold accuracy over –40°C to 125°C junction temperature.

Key Specifications

Pinout & Package

TPS3808G33DRVT is packaged in a 6-pin SOT-23 (DBV) with 2.90 mm × 1.60 mm body size and standard lead pitch. 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 TPS3808G33DBVR, the DRVT variant offers identical performance in a smaller reel format ideal for design validation; versus MAX6326UT33D3+, the TPS3808G33DRVT adds CT-based delay flexibility and MR control-critical for complex boot sequences and system-level fault recovery.

Availability

TPS3808G33DRVT is available at Aetrix Electronics and suitable for microcontroller power sequencing, battery-powered edge sensors, and industrial control module reset requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.

Supply support for TPS3808G33DRVT 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 supervision in resource-constrained embedded systems, emphasizing ultra-low quiescent current, high threshold accuracy, and flexible reset timing control.

FAQ

What is the exact threshold voltage of the TPS3808G33DRVT?

The TPS3808G33DRVT has a factory-set threshold voltage (V_IT) of 3.07 V, optimized for monitoring standard 3.3-V power rails. This value is guaranteed with ±0.5% accuracy over –40°C to 125°C and does not require external resistors or calibration. The TPS3808G33DRVT achieves this precision using an internal bandgap reference and trimmed comparator architecture.

How is the reset delay time configured on the TPS3808G33DRVT?

The TPS3808G33DRVT reset delay is set via the CT pin: leaving CT open yields ~20 ms, connecting CT to VDD via 40–200 kΩ gives ~300 ms, and connecting CT to GND through a ≥100-pF capacitor enables user-adjustable delays from 1.25 ms to 10 s. The TPS3808G33DRVT uses an internal 220-nA current source to charge the capacitor, ensuring predictable timing independent of supply voltage.

Does the TPS3808G33DRVT support manual reset functionality?

Yes, the TPS3808G33DRVT includes a dedicated MR (manual reset) input (Pin 3) that asserts RESET when driven low. MR features an internal 90-kΩ pull-up resistor, allowing it to float high when unused. This enables external microcontrollers, watchdog timers, or push-button circuits to trigger system reset independently of supply voltage conditions - a core capability of the TPS3808G33DRVT.

What package type is used for the TPS3808G33DRVT?

The TPS3808G33DRVT uses a 6-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm. This surface-mount package supports reflow soldering, offers thermal performance characterized by R_θJA = 180.9°C/W, and maintains full pin compatibility with other TPS3808 variants in the same footprint. The TPS3808G33DRVT's compact size suits space-constrained PCB layouts in portable and modular electronics.

Can the TPS3808G33DRVT monitor voltages other than 3.3 V?

No - the TPS3808G33DRVT is a fixed-threshold device calibrated specifically for 3.3-V rails (V_IT = 3.07 V). To monitor other voltages, select alternate members of the family: e.g., TPS3808G12 for 1.2 V (1.12 V threshold) or TPS3808G01 for adjustable thresholds down to 0.405 V. The TPS3808G33DRVT's internal reference and comparator are trimmed exclusively for its nominal 3.3-V application.