Texas Instruments TLV803EA42RDBZR

Overview

TLV803EA42RDBZR 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 4.2 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 TLV803EA42RDBZR datasheet, TLV803EA42RDBZR pinout, TLV803EA42RDBZR application, or TLV803EA42RDBZR 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 FPGA/ASIC power sequencing requirements.

Technical Context

The TLV803EA42RDBZR implements a precision bandgap-based 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 at 5% overdrive, ensuring robust operation in electrically harsh environments like factory automation controllers.

This variant belongs to the TLV803E family and uses a fixed 4.2 V falling threshold (VIT–) with VIT+ = VIT– + VHYS. The open-drain output supports flexible logic-level translation via external pull-up and maintains defined state down to VPOR = 0.7 V, critical for low-voltage microcontroller startup sequencing.

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 - confirmed per TI SLVSES2J Rev J Figure 6-3 and Table 6-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EA42RDBZR, TLV803EA42DBZR demands PCB rework due to GND-on-pin-1 versus RESET-on-pin-1, while MAX803SUR42+T trades 7× higher quiescent current and no 0.7 V VPOR guarantee for broader distributor availability and mature qualification history.

Availability

TLV803EA42RDBZR is available at Aetrix Electronics and suitable for electricity meters, factory automation controllers, and portable medical sensors requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for TLV803EA42RDBZR 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, embedded processing, and power management technologies, with decades of expertise in high-reliability industrial and automotive ICs.

The TLV803E series was engineered specifically for ultra-low-power system supervision in battery-constrained and thermally demanding applications, emphasizing precision thresholding, minimal IQ, and robust glitch immunity.

FAQ

What is the exact reset threshold voltage of the TLV803EA42RDBZR?

The TLV803EA42RDBZR has a factory-programmed falling threshold voltage (VIT–) of 4.2 V with ±0.5% typical accuracy across –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 (VIT+) equals VIT– plus hysteresis (1.2% typical), ensuring stable release without oscillation.

Does the TLV803EA42RDBZR require an external pull-up resistor on the RESET pin?

Yes, the TLV803EA42RDBZR uses an open-drain, active-low output topology and requires an external pull-up resistor to a valid logic-high voltage (e.g., 3.3 V or 5 V). Typical values range from 10 kΩ to 100 kΩ. This resistor sets the rise time and logic level - unlike push-pull variants such as TLV809E, which do not need it.

What is the minimum supply voltage at which TLV803EA42RDBZR guarantees a valid reset output?

The TLV803EA42RDBZR guarantees a defined output state down to VPOR = 0.7 V, meaning the RESET pin will assert correctly even when VDD rises slowly from near-zero. Below 0.7 V, the output is undefined. This feature is critical for energy-harvesting systems and ultra-low-voltage microcontrollers.

Is the TLV803EA42RDBZR pin-compatible with legacy MAX803-series supervisors?

Yes - the TLV803EA42RDBZR is explicitly designed as a pin-to-pin compatible upgrade for MAX803/809/810 in SOT-23-3 packages. It retains identical pinout (pin 1 = RESET, pin 2 = GND, pin 3 = VDD), footprint, and basic timing, while improving IQ, accuracy, temperature range, and VPOR specification.

What is the reset delay time for TLV803EA42RDBZR, and is it adjustable?

The TLV803EA42RDBZR has a fixed 200 ms reset delay time (variant A), as indicated by the "A" in its part number suffix. This delay is internally programmed and non-adjustable. It ensures sufficient hold time for slow peripherals like EEPROMs or FPGAs to initialize fully before release from reset.