Texas Instruments TLV803EA43VDBZR

Overview

TLV803EA43VDBZR 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 factory-programmed threshold (±0.5% typical accuracy), 200 ms fixed reset delay, 250 nA typical supply current, and operation down to 0.7 V VDD - enabling use in battery-backed microcontrollers, FPGA configuration circuits, and energy-harvesting nodes.

For engineers reviewing the TLV803EA43VDBZR datasheet, TLV803EA43VDBZR pinout, TLV803EA43VDBZR application, or TLV803EA43VDBZR equivalent, key selection considerations include its SOT-23-3 (DBZ) package with pin 1 = RESET, open-drain output requiring external pull-up, guaranteed reset assertion below 4.38 V, and compatibility with systems demanding <1 µA max IDD at 3.3 V.

Technical Context

The TLV803EA43VDBZR implements a precision bandgap-referenced comparator with built-in hysteresis (1.2% typical) to prevent chatter during slow-rising or noisy supply rails. Its internal glitch immunity filter rejects transients shorter than 10 µs, ensuring robust operation in electrically harsh environments like industrial sensors or metering front-ends.

Unlike push-pull variants, this device uses open-drain output topology, allowing wired-OR reset bus configurations and flexible voltage-level translation via external pull-up - critical for mixed-voltage SoC interfaces where RESET must interface with 1.8 V, 3.3 V, or 5 V logic domains without level shifters.

Key Specifications

Pinout & Package

SOT-23-3 (DBZ) package, 2.90 mm × 1.30 mm body size, with pin 1 = RESET (active-low open-drain), pin 2 = GND, pin 3 = VDD - matches industry-standard footprint of MAX803/TPS3809 and enables drop-in replacement in legacy designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809EA43DBZR and TPS3809K43DBVR, the TLV803EA43VDBZR uniquely supports open-drain bus sharing and full automotive-grade temperature operation while maintaining sub-µA quiescent current - making it optimal for space-constrained, multi-rail, and high-reliability embedded systems.

Availability

TLV803EA43VDBZR is available at Aetrix Electronics and suitable for electricity meters, portable medical sensors, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance across temperature extremes.

Supply support for TLV803EA43VDBZR 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, embedded processing, and connectivity 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-critical and thermally demanding applications where reliability, accuracy, and nanoamp quiescent current are non-negotiable design requirements.

FAQ

What is the exact reset threshold voltage of the TLV803EA43VDBZR?

The TLV803EA43VDBZR has a factory-programmed falling threshold voltage (V_IT–) 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 TI's SLVSES2J datasheet Section 7.5. The rising threshold (V_IT+) equals V_IT– plus hysteresis (1.2% typical), ensuring stable release without oscillation.

Does the TLV803EA43VDBZR require an external pull-up resistor?

Yes, the TLV803EA43VDBZR uses an open-drain, active-low RESET output and requires an external pull-up resistor to the target logic rail (e.g., 10 kΩ to 3.3 V). Unlike push-pull variants such as TLV809EA43DBZR, this topology enables wired-OR reset buses and voltage-level translation - a key design feature confirmed in the Functional Block Diagram (Section 8.2) and Pin Functions table (Section 6).

What is the reset delay time for TLV803EA43VDBZR, and is it adjustable?

The TLV803EA43VDBZR has a fixed 200 ms reset delay (variant A), as indicated by the "A" in its part number per TI's Device Naming Nomenclature (Figure 5-1). This delay is internally programmed and not adjustable via external components. Typical variation is ±30 ms over temperature, verified in Figure 7-20 of the datasheet.

Can TLV803EA43VDBZR operate reliably below 1.0 V supply voltage?

Yes - the TLV803EA43VDBZR guarantees defined reset behavior down to 0.7 V VDD (V_POR = 700 mV), enabling use in ultra-low-voltage scenarios such as coin-cell cold-start or energy-harvesting systems. Below this voltage, the RESET output state is undefined, as documented in Section 7.5 Electrical Characteristics and Figure 7-18.

Is TLV803EA43VDBZR pin-compatible with legacy MAX803-series supervisors?

Yes, the TLV803EA43VDBZR in SOT-23-3 (DBZ) package is explicitly pin-to-pin compatible with MAX803/809/810 and APX803/809/810 families, as stated in Section 1 Features. Pin 1 = RESET, Pin 2 = GND, Pin 3 = VDD matches the standard footprint, allowing direct replacement without PCB modification - provided the open-drain output topology is accommodated in the existing schematic.