Texas Instruments TLV803EC43DBZR

Overview

TLV803EC43DBZR 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 2.93 V factory-programmed threshold (±0.5% typical accuracy), 10 ms fixed reset delay, 250 nA typical supply current, and operates across –40°C to +125°C - enabling use in battery-powered IoT sensors and industrial edge controllers.

For engineers reviewing the TLV803EC43DBZR datasheet, TLV803EC43DBZR pinout, TLV803EC43DBZR application, or TLV803EC43DBZR equivalent, key selection criteria include its guaranteed RESET assertion down to 0.7 V VDD, SOT-23-3 (DBZ) package with pin 1 = RESET, open-drain output requiring external pull-up, and compatibility with legacy MAX803/809/810 designs.

Technical Context

The TLV803EC43DBZR implements a precision bandgap-referenced comparator with built-in hysteresis (VHYS ≈ 1.2% of VIT–) to prevent chatter during slow-rising or noisy supply rails. Its glitch immunity filter rejects transients <10 µs duration at 5% overdrive, ensuring robust operation in electrically harsh environments like factory automation PLCs.

As part of the TLV80xE family, it uses a single-supply architecture where VDD powers both the sensing circuitry and internal logic. The open-drain output supports flexible interface voltages via external pull-up and remains valid down to VPOR = 0.7 V, enabling early fault detection before system logic initializes.

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 equipment and PCB footprints for MAX803/MAX809.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX803SUR29+T and APX809-29SA-7, TLV803EC43DBZR delivers the lowest quiescent current (250 nA typ), full automotive-grade temperature range, and open-drain flexibility - making it optimal for battery-critical and industrial deployments where reliability and power efficiency are co-prioritized.

Availability

TLV803EC43DBZR is available at Aetrix Electronics and suitable for electricity meters, factory automation controllers, and portable medical sensors requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TLV803EC43DBZR 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 50 years of innovation in power management, signal chain, and timing products.

The TLV803E series belongs to TI's precision voltage supervisor product line, engineered specifically for ultra-low-power, high-accuracy reset functionality in battery-operated and thermally demanding applications.

FAQ

What is the exact reset threshold voltage of TLV803EC43DBZR?

The TLV803EC43DBZR has a factory-programmed falling threshold voltage (VIT–) of 2.93 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). The rising threshold (VIT+) equals VIT– plus hysteresis (≈1.2% of VIT–), ensuring noise immunity during supply recovery.

Does TLV803EC43DBZR require an external pull-up resistor?

Yes, TLV803EC43DBZR uses an open-drain active-low output and requires an external pull-up resistor on the RESET pin. A 10 kΩ resistor to the monitored rail (e.g., 3.3 V) is recommended per the datasheet. Unlike push-pull variants (e.g., TLV809E), TLV803EC43DBZR cannot drive high actively - the pull-up defines the logic-high level and enables wired-OR reset bus configurations.

What is the reset delay time for TLV803EC43DBZR and how is it implemented?

The TLV803EC43DBZR provides a fixed 10 ms reset delay (variant "C" per TI's naming convention). This delay begins when VDD rises above VIT+ and ends before RESET deasserts. Internally, it uses a precision RC timer with temperature compensation, delivering 6.5–13.5 ms over –40°C to +125°C. No external components are needed - the timing is fully integrated and factory-calibrated.

Can TLV803EC43DBZR operate reliably below 1.0 V?

Yes - TLV803EC43DBZR guarantees defined RESET output behavior down to VPOR = 0.7 V, meaning it asserts RESET predictably even during deep brownout or ultra-low-voltage startup. Below 0.7 V, the output becomes undefined. This capability is critical for energy-harvesting systems and cold-start scenarios where supply ramps slowly from near-zero.

Is TLV803EC43DBZR pin-compatible with legacy MAX803 designs?

Yes, TLV803EC43DBZR is pin-to-pin compatible with MAX803 (2.93 V variant) in the SOT-23-3 (DBZ) package with identical pin 1 = RESET, pin 2 = GND, pin 3 = VDD assignment. It maintains the same footprint, thermal profile, and electrical interface - enabling direct replacement without PCB modification, while offering lower IQ, tighter threshold accuracy, and extended temperature range.