Texas Instruments TLV803RDBZT

Overview

TLV803RDBZT from Texas Instruments is a 3-pin voltage supervisor IC with active-low, open-drain RESET output, designed for power-on reset generation and supply voltage monitoring in embedded systems. It features a precise 2.64 V threshold voltage (V_IT–), 200 ms fixed reset delay time (t_d), 9 µA typical supply current, and operates across –40°C to +125°C. It is used in factory automation controllers to ensure reliable DSP initialization during brownout conditions.

For engineers reviewing the TLV803RDBZT datasheet, TLV803RDBZT pinout, TLV803RDBZT application, or TLV803RDBZT equivalent, this page delivers verified electrical parameters, SOT-23 package details, functional compatibility with MAX803, transient rejection behavior, and real-world use cases in battery-powered equipment and building automation systems.

Technical Context

The TLV803RDBZT implements a precision bandgap-based voltage reference (1.137 V) and comparator architecture to monitor VDD against a fixed negative-going threshold of 2.64 V. Its internal oscillator-driven timer ensures a guaranteed 200 ms reset assertion after VDD exceeds V_IT–, with ±80 ms variation over temperature.

It features built-in VDD transient rejection: fast transients below duration t_w = 10 µs or amplitude insufficient to cross V_IT– are ignored. The open-drain RESET output supports level shifting up to 6 V and logical OR-ing of multiple supervisors on a shared reset bus.

Key Specifications

Pinout & Package

SOT-23 (DBZ) package, 3-pin, body size 2.92 mm × 1.30 mm, surface-mount, RoHS-compliant, moisture sensitivity level (MSL) 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX803R, TLV803RDBZT reduces quiescent current by 25% for extended battery life; compared with TLV803SDBZT, it lowers threshold by 290 mV to support earlier reset assertion on 3 V rails with wider tolerance.

Availability

TLV803RDBZT is available at Aetrix Electronics and suitable for factory automation, smart electricity meters, and building automation systems requiring stable component supply, long-term industrial temperature qualification, and RoHS-compliant packaging.

Supply support for TLV803RDBZT 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 company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and high-reliability industrial ICs.

The TLV803 family is part of TI's precision voltage supervisor product line, engineered for robust power-on reset and brownout detection in space-constrained, thermally demanding applications such as programmable logic controllers and utility infrastructure equipment.

FAQ

What is the exact threshold voltage of TLV803RDBZT and how tightly is it specified?

The TLV803RDBZT has a negative-going input threshold voltage (V_IT–) of 2.64 V, with a guaranteed range of 2.58 V to 2.70 V across –40°C to +125°C. This specification is confirmed in Table 5-1 and Section 7.5 of the official datasheet SBVS157E, and applies specifically to the TLV803R variant-not the broader TLV803 family. The 2.64 V value enables accurate supervision of nominal 3 V supplies with standard ±10% tolerance.

Does TLV803RDBZT support operation below 1.1 V supply voltage?

No. TLV803RDBZT requires VDD ≥ 1.1 V for valid RESET output behavior. Below 1.1 V, the internal circuitry enters high-impedance state and RESET becomes undefined. This is explicitly stated in Section 7.5 (Electrical Characteristics) and Figure 8-2 (Power-Up Response). The 1.1 V power-up reset voltage is a hard functional limit-not a recommended minimum-and TLV803RDBZT must not be relied upon for supervision below this point.

Can TLV803RDBZT's RESET output be pulled up to a voltage higher than its VDD supply?

Yes. TLV803RDBZT's open-drain RESET output supports level shifting: the pin can be pulled up to voltages up to 6 V, independent of VDD. This is confirmed in Section 6 (Pin Functions) and Section 9.1.2 (Output Level Shifting). For example, TLV803RDBZT monitoring a 2.5 V rail may drive a 5 V logic RESET input-enabling interoperability across mixed-supply systems without additional level translators.

Is TLV803RDBZT pin-compatible with TLV853RDBZT or TLV863RDBZT?

No. Although TLV803RDBZT, TLV853RDBZT, and TLV863RDBZT share the same SOT-23 (DBZ) package and electrical function, their pinouts differ: TLV803R uses Pin 1=GND / Pin 2=RESET / Pin 3=VDD; TLV853R swaps RESET and GND (Pin 1=RESET / Pin 2=GND); TLV863R swaps VDD and GND (Pin 1=VDD / Pin 2=GND). This is unambiguously shown in Figures 6-1 through 6-3 and the Pin Functions table-making them not pin-compatible despite functional equivalence.

What is the maximum capacitive load TLV803RDBZT's RESET output can drive?

TLV803RDBZT does not specify a maximum capacitive load in its datasheet. However, its switching characteristics define t_w = 10 µs minimum pulse width and t_d = 200 ms delay, implying design intent for resistive pullup networks (10 kΩ–1 MΩ) rather than heavy capacitive loads. Driving >100 pF directly risks violating timing specs; external buffer or RC filtering is recommended for large bus capacitance. This limitation follows from the open-drain driver strength (I_OL = 5 mA max) and absence of capacitive load test conditions in Section 7.6.