Texas Instruments TLV803EA43DBZR

Overview

TLV803EA43DBZR from Texas Instruments is an open-drain, active-low voltage supervisor IC designed for reliable power-on reset and brownout detection in ultra-low-power systems. It features a 4.38 V threshold voltage (±0.5% typical accuracy), 200 ms fixed reset delay, 250 nA typical supply current, and operates across –40°C to +125°C - enabling use in battery-powered industrial sensors and portable medical devices.

For engineers reviewing the TLV803EA43DBZR datasheet, TLV803EA43DBZR pinout, TLV803EA43DBZR application, or TLV803EA43DBZR equivalent, key selection considerations include its SOT-23-3 (DBZ) package with pin 1 = RESET, guaranteed reset assertion down to 0.7 V VDD, ±0.5% threshold accuracy, and integrated glitch immunity against transients ≥10 µs.

Technical Context

The TLV803EA43DBZR implements a precision bandgap-referenced comparator with built-in hysteresis (VHYS ≈ 1.2% of VIT–) to prevent chatter during slow-rising/falling supply rails. Its internal timer enforces a fixed 200 ms reset timeout after VDD crosses the rising threshold (VIT+ = VIT– + VHYS), ensuring stable processor initialization.

As an open-drain output device, it requires an external pull-up resistor and supports logic-level compatibility with 1.7–6 V supplies. The IC asserts RESET low when VDD falls below 4.38 V and holds it for 200 ms after VDD rises above ~4.43 V, with guaranteed operation down to VPOR = 0.7 V.

Key Specifications

Pinout & Package

SOT-23-3 (DBZ) package, 2.90 mm × 1.30 mm body size, with pin 1 = RESET, pin 2 = GND, pin 3 = VDD - compatible with standard pick-and-place and reflow processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3809K33DBVR and MAX809SEUR+T, the TLV803EA43DBZR delivers superior threshold accuracy (±0.5% vs. ±2.5%), lower power (250 nA vs. 10 µA), and open-drain topology for flexible interfacing - making it optimal for next-generation battery-constrained and high-reliability applications.

Availability

TLV803EA43DBZR is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, smart meter auxiliary rails, and factory automation I/O modules requiring stable component supply across extended temperature and long lifecycle demands.

Supply support for TLV803EA43DBZR 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 for industrial, automotive, and personal electronics markets.

The TLV803E series belongs to TI's precision low-power voltage supervisor product line, engineered specifically for battery longevity, high-accuracy rail monitoring, and robust operation in harsh thermal environments.

FAQ

What is the exact threshold voltage and accuracy of TLV803EA43DBZR?

The TLV803EA43DBZR has a factory-programmed falling threshold voltage (VIT–) of 4.38 V with ±0.5% typical accuracy over –40°C to +125°C. This value is confirmed in the Electrical Characteristics table (Section 7.5) and applies specifically to the A43 variant. Accuracy degrades to ±2% maximum over temperature per datasheet limits.

Does TLV803EA43DBZR require an external pull-up resistor?

Yes, TLV803EA43DBZR uses an open-drain active-low output and requires an external pull-up resistor to define the logic-high state. Typical values range from 10 kΩ to 100 kΩ depending on rise-time and bus capacitance. Pull-up voltage may differ from VDD, enabling level-shifting - a feature not supported by push-pull alternatives like TLV809E.

What is the reset delay time for TLV803EA43DBZR and how is it determined?

The TLV803EA43DBZR has a fixed 200 ms reset delay (variant A), specified as tD = 130–270 ms over temperature. This delay is internally generated and begins when VDD rises above VIT+ (≈4.43 V). It is independent of external components and ensures reliable processor initialization before releasing the reset signal.

Can TLV803EA43DBZR operate below 1.7 V supply voltage?

Yes - TLV803EA43DBZR guarantees defined reset behavior down to VPOR = 0.7 V, meaning the output state remains controlled even during deep brownout. However, the recommended operating range starts at 1.7 V; below that, timing parameters and accuracy are not characterized, though functional reset assertion is ensured.

Is TLV803EA43DBZR pin-compatible with legacy MAX803-series supervisors?

Yes, TLV803EA43DBZR is explicitly pin-to-pin compatible with MAX803/809/810 in SOT-23-3 (DBZ) packages per Section 1 Features and Device Comparison. This includes identical pin 1 = RESET, pin 2 = GND, pin 3 = VDD layout - enabling drop-in replacement without PCB changes for most designs using 4.38 V threshold variants.