Texas Instruments TLV803EB42VDBZR

Overview

TLV803EB42VDBZR 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), 40 µs 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 TLV803EB42VDBZR datasheet, TLV803EB42VDBZR pinout, TLV803EB42VDBZR application, or TLV803EB42VDBZR 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 topology requiring external pull-up, and compatibility with legacy MAX803/TPS3809 designs.

Technical Context

The TLV803EB42VDBZR implements a precision bandgap-referenced comparator with built-in hysteresis (1.2% typical VHYS) to prevent false resets during supply rail recovery. Its glitch immunity circuit rejects transients ≤10 µs at 5% overdrive, ensuring robust operation in electrically noisy environments like factory automation PLCs.

As a member of the TLV80xE family, it integrates a fixed-delay timer and threshold detection logic without external components. The device asserts RESET when VDD falls below 4.2 V (VIT–), holds it low for 40 µs after VDD rises above VIT+ (4.2 V + VHYS), and maintains defined output state down to VPOR = 0.7 V - critical for deterministic startup in energy-harvesting systems.

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/TPS3809.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX803SUR42+T, TLV803EB42VDBZR delivers 6.4× lower max supply current and full industrial temperature support; versus TPS3809K42DBVR, it offers open-drain flexibility for multi-source reset arbitration but requires one additional passive component.

Availability

TLV803EB42VDBZR is available at Aetrix Electronics and suitable for electricity meters, portable medical sensors, and industrial PLC I/O modules requiring stable component supply across long production lifecycles.

Supply support for TLV803EB42VDBZR 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 connectivity technologies with over 90 years of innovation in power management and signal conditioning.

The TLV80xE family was engineered specifically for ultra-low-power, high-accuracy voltage supervision in battery-critical and thermally demanding applications - delivering enhanced reliability over legacy reset ICs.

FAQ

What is the minimum supply voltage at which TLV803EB42VDBZR guarantees RESET assertion?

TLV803EB42VDBZR guarantees valid RESET assertion down to 0.7 V VDD, as specified by its VPOR (power-on-reset voltage) parameter. This ensures deterministic reset behavior during deep brownout conditions where other supervisors may enter undefined states. The TLV803EB42VDBZR maintains this capability across its full –40°C to +125°C operating range, making it suitable for applications with wide input voltage transients.

Does TLV803EB42VDBZR require an external pull-up resistor on the RESET pin?

Yes, TLV803EB42VDBZR uses an open-drain, active-low output topology and requires an external pull-up resistor to define the high state of the RESET signal. A typical value is 10 kΩ connected between RESET (pin 1) and the monitored VDD rail. This configuration enables wired-OR reset bus architectures and level-shifting flexibility - a key distinction from push-pull alternatives like TLV809E or TPS3809K42DBVR.

What is the actual reset delay tolerance for TLV803EB42VDBZR across temperature and voltage?

The TLV803EB42VDBZR has a fixed 40 µs reset delay (tD) with typical variation of ±10% over –40°C to +125°C and 1.7 V to 6 V VDD. Figure 7-22 in the datasheet confirms tD remains tightly bounded between 36 µs and 44 µs across temperature, enabling precise timing control in real-time systems without software calibration. This stability is achieved through on-chip RC timing with temperature compensation.

How does the 4.2 V threshold of TLV803EB42VDBZR map to common power rails?

The 4.2 V threshold of TLV803EB42VDBZR is optimized for supervising 5 V nominal rails (e.g., USB-powered peripherals, industrial 5 V logic) with ~16% undervoltage margin, or 3.3 V LDO outputs with integrated dropout compensation. Its ±0.5% accuracy eliminates need for design margin beyond 50 mV, supporting tighter supply specifications in space-constrained applications such as smart meter auxiliary power supplies.

Is TLV803EB42VDBZR pin-compatible with legacy MAX803 series devices?

Yes, TLV803EB42VDBZR is pin-to-pin compatible with MAX803SUR42+T and other MAX803 variants in the SOT-23-3 (DBZ) package with identical pin 1 = RESET, pin 2 = GND, pin 3 = VDD configuration. This allows direct replacement in existing designs without PCB modification, while delivering improved specs: 6.4× lower max supply current (1 µA vs. 6.4 µA), extended temperature range (–40°C to +125°C vs. 0°C to +70°C), and guaranteed 0.7 V VPOR operation.