Texas Instruments TLV803EC29DBZR

Overview

TLV803EC29DBZR 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 ±0.5% threshold voltage, 10 ms fixed reset delay, 250 nA typical supply current, and operation from 0.7 V to 6 V supply - enabling use in battery-backed microcontrollers and energy-harvesting nodes.

For engineers reviewing the TLV803EC29DBZR datasheet, TLV803EC29DBZR pinout, TLV803EC29DBZR application, or TLV803EC29DBZR equivalent, key selection considerations include its SOT-23-3 (DBZ) package with pin 1 = GND, open-drain output requiring external pull-up, guaranteed reset assertion down to VPOR = 0.7 V, and ±0.5% threshold accuracy over –40°C to +125°C.

Technical Context

The TLV803EC29DBZR implements a precision bandgap-referenced comparator with built-in hysteresis (VHYS ≈ 1.2%) to prevent chatter during slow-rising or noisy supply rails. Its internal glitch immunity filter rejects transients shorter than 10 µs (typical), ensuring robust operation in electrically noisy environments like factory automation or metering.

As a member of the TLV80xE family, it uses a fixed-threshold, fixed-delay architecture with no configuration pins or external components required beyond the pull-up resistor. The device asserts RESET low when VDD falls below 2.93 V and holds it for exactly 10 ms after VDD rises above VIT+ (2.93 V + VHYS), providing deterministic timing for FPGA, MCU, or ASIC initialization sequences.

Key Specifications

Pinout & Package

SOT-23-3 (DBZ) package, 2.90 mm × 1.30 mm body size, with pin 1 = GND (confirmed per Figure 6-1 and Table 6-1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EC29DBZR, TLV803EC29DBVT offers identical supervision performance in a smaller package but demands layout adaptation, while MAX803SUR29+T provides mechanical compatibility at the expense of 6.4× higher quiescent current and reduced threshold precision - making TLV803EC29DBZR optimal for new ultra-low-power designs.

Availability

TLV803EC29DBZR 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 guaranteed parametric consistency across production lots.

Supply support for TLV803EC29DBZR 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 experience 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 generation in battery-critical and thermally demanding applications - emphasizing VPOR robustness, glitch immunity, and extended temperature operation.

FAQ

What is the exact reset threshold voltage and tolerance for TLV803EC29DBZR?

The TLV803EC29DBZR 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 fixed and unadjustable; the rising threshold (VIT+) equals VIT– plus hysteresis (≈1.2% of VIT–), ensuring stable release without oscillation during slow-rising supplies.

Does TLV803EC29DBZR require an external pull-up resistor, and what value is recommended?

Yes, TLV803EC29DBZR uses an open-drain active-low RESET output and requires an external pull-up resistor. A 10 kΩ resistor to the monitored VDD rail (or a higher logic rail) is recommended per datasheet test conditions; values from 4.7 kΩ to 100 kΩ are acceptable depending on rise time and bus loading requirements.

What is the minimum supply voltage at which TLV803EC29DBZR guarantees correct reset assertion?

TLV803EC29DBZR guarantees defined reset behavior down to VPOR = 0.7 V - meaning the RESET output remains predictably asserted (low) even when VDD drops to 0.7 V. Below this, the output state is undefined, making it suitable for deep brownout detection in ultra-low-voltage systems.

How does the 10 ms reset delay in TLV803EC29DBZR behave across temperature and voltage?

The 10 ms reset delay (variant C) is factory-trimmed and exhibits minimal drift: typical variation is ±0.5 ms over –40°C to +125°C (see Figure 7-23), and is independent of VDD within 1.7 V–6 V. This stability eliminates reliance on external RC timing components and ensures consistent boot sequencing across environmental extremes.

Is TLV803EC29DBZR pin-compatible with legacy MAX803-series supervisors?

Yes, TLV803EC29DBZR is explicitly pin-to-pin compatible with MAX803/809/810 in the SOT-23-3 (DBZ) package with pin 1 = GND. No PCB changes are required for drop-in replacement, enabling immediate power and accuracy improvements in existing designs without layout revision.