Texas Instruments TLV803EB29DBZR

Overview

TLV803EB29DBZR 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 falling threshold (±0.5% typical), 40 µs fixed reset delay, 250 nA typical supply current at 3.3 V, and operates across –40°C to +125°C. It is used in battery-powered microcontrollers, FPGA configuration circuits, and portable instrumentation where deterministic reset assertion down to 0.7 V VDD is required.

For engineers reviewing the TLV803EB29DBZR datasheet, TLV803EB29DBZR pinout, TLV803EB29DBZR application, or TLV803EB29DBZR equivalent, key selection criteria include its open-drain output topology requiring external pull-up, guaranteed reset operation below 1 V supply, ±0.5% threshold accuracy over temperature, and compatibility with SOT-23-3 (DBZ) PCB footprints.

Technical Context

The TLV803EB29DBZR 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 on VDD, ensuring robust operation in electrically harsh environments such as factory automation interfaces.

Unlike push-pull variants, this device uses an open-drain RESET output that must be pulled up externally-enabling wired-OR reset bus configurations and compatibility with mixed-voltage logic domains. The 40 µs reset timeout is factory-trimmed and stable across temperature, eliminating need for external RC timing components.

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 (R-pinout variant per TI nomenclature).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EA29DBZR and MAX803SUR29+T, TLV803EB29DBZR uniquely delivers sub-100 µs deterministic reset timing combined with nanoscale quiescent current and ±0.5% threshold accuracy-making it optimal for next-generation ultra-low-power embedded controllers where both speed and energy efficiency are critical.

Availability

TLV803EB29DBZR is available at Aetrix Electronics and suitable for electricity metering, factory automation, and portable battery-powered equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TLV803EB29DBZR 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 belongs to TI's precision voltage supervisor product line, engineered specifically for ultra-low-power, high-accuracy reset functionality in battery-constrained and thermally demanding applications.

FAQ

What is the minimum supply voltage at which TLV803EB29DBZR guarantees a valid RESET output state?

The TLV803EB29DBZR guarantees a defined RESET output state down to 0.7 V VDD, known as its power-on-reset (VPOR) voltage. Below this level, the output becomes undefined. This feature ensures reliable reset assertion during deep brownout or ultra-low-voltage battery discharge scenarios, a key requirement in energy-harvesting and primary-cell applications where TLV803EB29DBZR is commonly deployed.

Does TLV803EB29DBZR require an external pull-up resistor on the RESET pin?

Yes, TLV803EB29DBZR uses an open-drain, active-low output and requires an external pull-up resistor to establish the logic-high state. A typical value is 10 kΩ to the target logic rail (e.g., 3.3 V or 1.8 V). This design enables wired-OR reset buses and voltage-level translation-critical features in mixed-supply systems where TLV803EB29DBZR is often integrated alongside FPGAs or multi-rail MCUs.

What is the actual reset delay time for TLV803EB29DBZR, and how stable is it over temperature?

The TLV803EB29DBZR has a fixed 40 µs reset delay (t_D) that is factory-trimmed and exhibits minimal drift-typically 15.6 µs to 16.25 µs across –40°C to +125°C (per Figure 7-22). This stability eliminates timing uncertainty in fast-boot systems and removes dependency on external RC networks, making TLV803EB29DBZR ideal for real-time microcontrollers where predictable reset release is essential.

How does the ±0.5% threshold accuracy of TLV803EB29DBZR impact system reliability compared to standard supervisors?

The ±0.5% typical threshold accuracy of TLV803EB29DBZR-tighter than industry-standard ±2%-reduces false resets caused by marginal supply dips and improves margin for 3.3 V rail monitoring. In systems like smart meters or industrial sensors, this directly enhances long-term field reliability by ensuring reset only triggers at true undervoltage events, not measurement drift. TLV803EB29DBZR achieves this without calibration, simplifying design-in.

Is TLV803EB29DBZR pin-compatible with legacy MAX803 devices?

No, TLV803EB29DBZR is not pin-compatible with MAX803-series devices. While functionally comparable and marketed as enhanced alternatives, TLV803EB29DBZR uses R-pinout (pin 1 = RESET, pin 2 = GND, pin 3 = VDD), whereas MAX803 places GND on pin 1. Substituting TLV803EB29DBZR into a MAX803 footprint would cause incorrect biasing and failure. Always verify pin mapping-TLV803EB29DBZR requires its designated SOT-23-3 layout.