Texas Instruments TLV803EA43RDBZR

Overview

TLV803EA43RDBZR 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 metering and industrial edge nodes.

For engineers reviewing the TLV803EA43RDBZR datasheet, TLV803EA43RDBZR pinout, TLV803EA43RDBZR application, or TLV803EA43RDBZR equivalent, key selection considerations include its SOT-23-3 (DBZ) package with pin 1 = RESET, open-drain output requiring external pull-up, guaranteed operation down to 0.7 V VDD, and integrated glitch immunity (10 µs typical).

Technical Context

The TLV803EA43RDBZR implements a precision bandgap-referenced comparator with built-in hysteresis (1.2% typical) to prevent chatter during threshold crossing. Its reset assertion logic is triggered when VDD falls below 4.38 V (VIT–), and deassertion occurs only after VDD rises above VIT+ (4.38 V + VHYS) and remains stable for the full 200 ms timeout period.

It integrates glitch immunity filtering that rejects transients shorter than 10 µs at 5% overdrive, ensuring robust operation in noisy supply environments. The device maintains defined output state down to VPOR = 0.7 V, supporting reliable reset generation even during deep brownout conditions.

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 profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EA43RDBZR, TLV803EA43DBZR demands PCB changes due to GND/pin-1 mapping, while MAX803SUR43+T trades off accuracy, temperature range, and quiescent current for lower unit cost in less demanding environments.

Availability

TLV803EA43RDBZR is available at Aetrix Electronics and suitable for electricity metering, factory automation sensors, and portable medical devices requiring stable component supply across long production lifecycles and extended temperature ranges.

Supply support for TLV803EA43RDBZR 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 specializing in analog and embedded processing technologies, with decades of expertise in precision power management and signal chain solutions.

The TLV803E series belongs to TI's low-power voltage supervisor product line, engineered specifically for battery-critical and thermally demanding applications where nanoscale IQ, high accuracy, and guaranteed operation down to 0.7 V are essential.

FAQ

What is the exact reset threshold voltage of TLV803EA43RDBZR?

The TLV803EA43RDBZR 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 laser-trimmed during production and specified in the Electrical Characteristics table of the official datasheet (SLVSES2J, Section 7.5). The rising threshold (VIT+) equals VIT– plus hysteresis (1.2% typical).

Does TLV803EA43RDBZR require an external pull-up resistor?

Yes, TLV803EA43RDBZR uses an open-drain, active-low output and requires an external pull-up resistor on the RESET pin. Typical values range from 10 kΩ to 100 kΩ, referenced to the same supply rail as VDD. Unlike push-pull variants (e.g., TLV809E), TLV803EA43RDBZR cannot drive high actively - the pull-up establishes the logic-high state when the output is released.

What is the reset delay time for TLV803EA43RDBZR and how is it implemented?

The TLV803EA43RDBZR provides a fixed 200 ms reset delay (variant A), implemented via an internal timer that starts counting only after VDD rises above VIT+. This delay is factory-set and does not require external components. It ensures the system remains held in reset long enough for power supplies and clocks to stabilize before MCU release - critical for reliable boot sequences in embedded systems.

Can TLV803EA43RDBZR operate with supply voltages below 1.0 V?

Yes, TLV803EA43RDBZR is fully specified to monitor and assert reset down to VPOR = 0.7 V, and its output remains valid and defined for VDD as low as 0.7 V. This capability enables robust brownout detection in ultra-low-voltage systems such as energy-harvesting nodes or deeply discharged battery scenarios where other supervisors fail silently.

Is TLV803EA43RDBZR pin-compatible with legacy MAX803-series supervisors?

TLV803EA43RDBZR is pin-to-pin compatible with MAX803/809/810 in the SOT-23-3 (DBZ) package per TI's Device Comparison documentation. However, note that TLV803EA43RDBZR uses the "R" pinout (pin 1 = RESET), whereas some MAX803 variants use pin 1 = GND. Always verify pin mapping in the schematic and layout to avoid misconnection.