Texas Instruments TPS3809K33MDBVREP

Overview

TPS3809K33MDBVREP from Texas Instruments is a precision 3-pin supply voltage supervisor IC designed for power-on reset generation and supply monitoring in DSP, microcontroller, and processor-based systems. It features a fixed 2.93 V threshold voltage, 200 ms reset delay time, 9 µA typical supply current, and operates across –55°C to 125°C for aerospace and harsh-environment applications.

For engineers reviewing the TPS3809K33MDBVREP datasheet, TPS3809K33MDBVREP pinout, TPS3809K33MDBVREP application, or TPS3809K33MDBVREP equivalent, key selection criteria include its SOT-23 (DBV) package, open-drain active-low RESET output, fixed threshold accuracy, extended temperature qualification, and compatibility with legacy MAX809-based designs.

Technical Context

The TPS3809K33MDBVREP implements a precision bandgap reference and comparator-based supervision architecture with internal hysteresis (40 mV) to reject supply noise. Its reset logic asserts low when VDD falls below 2.93 V and maintains the state until VDD rises above threshold plus hysteresis, then initiates a fixed 200 ms timer before releasing RESET high.

No external components are required: the device integrates all sensing, timing, and output drive circuitry. The open-drain RESET output supports wired-OR configurations and is compatible with 2–6 V supply domains, enabling use with 3.3 V systems while tolerating up to 6 V VDD during transient conditions.

Key Specifications

Pinout & Package

SOT-23 (DBV) 3-pin surface-mount package, 1.45 mm max height, JEDEC MO-178 compliant, tape-and-reel (3000 pcs), RoHS-compliant NiPdAu lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supply voltage supervision applications.

Compared with MAX809TRD2T, TPS3809K33MDBVREP offers superior temperature range and lower quiescent current but shares pinout and basic functionality; compared with TPS3809L30MDBVREP, it provides correct threshold alignment for 3.3 V systems while maintaining identical reliability and packaging.

Availability

TPS3809K33MDBVREP is available at Aetrix Electronics and suitable for industrial control systems, aerospace avionics, and automotive engine control units requiring stable component supply across extended temperature and long product lifecycles.

Supply support for TPS3809K33MDBVREP 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 and embedded processing solutions, with over 90 years of innovation in high-reliability, high-performance electronics.

The TPS3809-EP family was engineered specifically for extended-temperature, high-integrity applications including space, defense, and critical infrastructure - emphasizing precision threshold stability, zero-defect manufacturing, and long-term supply assurance.

FAQ

What is the exact reset threshold voltage of the TPS3809K33MDBVREP?

The TPS3809K33MDBVREP has a precisely trimmed threshold voltage of 2.93 V, with ±1.5% tolerance over its full operating temperature range of –55°C to 125°C. This value is factory-set and does not require external calibration. The TPS3809K33MDBVREP uses an internal voltage divider and bandgap reference to maintain this accuracy, making it suitable for reliable 3.3 V system supervision where marginal voltage drops must trigger reset before functional failure occurs.

Does the TPS3809K33MDBVREP require external components to operate?

No, the TPS3809K33MDBVREP requires no external components for basic operation. Its internal circuitry includes the voltage reference, comparator, timer, and output driver. Only an external pull-up resistor on the open-drain RESET pin is needed to establish the high logic state. The TPS3809K33MDBVREP is designed for minimal footprint and maximum integration - ideal for space-constrained and high-reliability applications where component count reduction is critical.

Is the TPS3809K33MDBVREP pin-compatible with the MAX809?

Yes, the TPS3809K33MDBVREP is explicitly specified as pin-for-pin compatible with the MAX809 in TI's official documentation. Both devices use the same SOT-23 (DBV) 3-pin package with identical pin assignments: Pin 1 = RESET (open-drain), Pin 2 = VDD, Pin 3 = GND. This allows direct replacement in existing MAX809 layouts without PCB modification, while delivering improved temperature range, lower supply current, and enhanced reliability testing in the TPS3809K33MDBVREP.

What is the reset delay time of the TPS3809K33MDBVREP and how is it implemented?

The TPS3809K33MDBVREP provides a fixed reset delay time of 200 ms (typical), with a guaranteed range of 120–280 ms across temperature and voltage. This delay begins only after VDD rises above the 2.93 V threshold and is generated by an internal RC timer - no external capacitor is needed. The TPS3809K33MDBVREP uses this delay to ensure microprocessors, FPGAs, and DSPs complete internal initialization before release from reset, preventing race conditions and undefined behavior during boot.

What temperature range is the TPS3809K33MDBVREP qualified for, and what standards apply?

The TPS3809K33MDBVREP is qualified for operation from –55°C to 125°C and undergoes JEDEC-standard reliability testing including Highly Accelerated Stress Test (HAST), temperature cycling, autoclave, electromigration, bond intermetallic life, and mold compound life. This qualification pedigree ensures long-term reliability in aerospace, defense, and industrial environments where thermal extremes and mission-critical uptime are non-negotiable. The TPS3809K33MDBVREP meets the requirements of enhanced plastic (EP) product line specifications for extended-life, high-integrity applications.