Texas Instruments TLV809L30DBZT

Overview

TLV809L30DBZT from Texas Instruments is a 3-pin supply voltage supervisor IC with fixed 2.64 V threshold, push-pull active-low RESET output, 200 ms reset delay, 9 µA typical supply current, and operation from –40°C to +85°C. It monitors 3.0 V rail integrity in microcontroller-based systems requiring reliable power-on reset.

For engineers reviewing the TLV809L30DBZT datasheet, TLV809L30DBZT pinout, TLV809L30DBZT application, or TLV809L30DBZT equivalent, key selection criteria include undervoltage detection accuracy (±30 mV hysteresis), SOT-23 (DBZ) package compatibility, push-pull drive capability (5 mA sink), and absence of external components.

Technical Context

The TLV809L30DBZT integrates an internal 1.137 V reference, precision resistor divider, oscillator-based timer, and push-pull output stage. Its detection circuitry asserts RESET when VDD falls below 2.64 V (VIT–) and maintains assertion until VDD rises above that threshold plus 35 mV hysteresis.

Power-up behavior initiates RESET assertion at VDD ≥ 1.1 V; deassertion occurs only after VDD exceeds VIT– and the internal 200 ms timer expires. The device operates across 2 V to 6 V supply range and requires no external timing or biasing components.

Key Specifications

Pinout & Package

SOT-23 (DBZ) package: 3-pin, single-row, gull-wing leads; body size 2.92 mm × 1.30 mm; RoHS-compliant, NIPDAU/SN lead finish; MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809L30DBZT, TLV809L30DBVT offers identical functionality in a slightly larger SOT-23 variant with better thermal performance, while MAX809TRD3+T provides legacy drop-in compatibility at the cost of reduced timing precision and higher power consumption.

Availability

TLV809L30DBZT is available at Aetrix Electronics and suitable for industrial PLC controllers, smart metering systems, network router baseboards, and home appliance control modules requiring stable component supply and long-term manufacturability.

Supply support for TLV809L30DBZT 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 headquartered in Dallas, Texas, designing and manufacturing analog and embedded processing chips for industrial, automotive, and consumer markets.

The TLV809 family was developed specifically for low-power, high-accuracy supply monitoring in space-constrained processor-based systems, emphasizing minimal external components and guaranteed reset timing.

FAQ

What is the exact threshold voltage of the TLV809L30DBZT and how tightly is it specified?

The TLV809L30DBZT has a nominal threshold voltage (VIT–) of 2.64 V, with a guaranteed range of 2.58 V to 2.70 V over the full –40°C to +85°C operating temperature range. This corresponds to approximately 10% below a nominal 3.0 V supply, and the 35 mV hysteresis ensures stable operation during slow or noisy supply transitions. The specification is derived from internal precision resistor divider ratios and is validated per TI's production test flow.

Does the TLV809L30DBZT require any external components to operate correctly?

No, the TLV809L30DBZT requires no external resistors, capacitors, or timing components to perform its core voltage supervision function. However, TI strongly recommends placing a 0.1 µF ceramic bypass capacitor between the VDD and GND pins, located as close as possible to the device, to stabilize the internal reference and improve noise immunity. This capacitor is not part of the functional reset circuit but is essential for meeting datasheet performance specifications.

How does the reset delay timing work in the TLV809L30DBZT during power-up?

During power-up, the TLV809L30DBZT asserts RESET when VDD reaches 1.1 V. Once VDD rises above the 2.64 V threshold (VIT–), a 200 ms (typical) internal timer begins. RESET remains asserted until this timer expires, ensuring the host processor receives a clean, extended reset pulse. The actual delay ranges from 120 ms to 280 ms across process and temperature extremes, as specified in the Electrical Characteristics table.

Can the TLV809L30DBZT be used to monitor supplies other than 3.0 V?

The TLV809L30DBZT is optimized for 3.0 V rail supervision, with its 2.64 V threshold set to detect a ~12% undervoltage condition. While it can technically monitor any supply between 2 V and 6 V, using it for non-3.0 V rails (e.g., 2.5 V or 5 V) would result in inappropriate trip points. For those voltages, TI offers dedicated variants: TLV809J25 (2.25 V) and TLV809I50 (4.55 V). Selecting the correct variant ensures accurate margining relative to the target supply.

What is the output structure of the TLV809L30DBZT RESET pin and what load can it drive?

The TLV809L30DBZT features a push-pull (totem-pole) RESET output, capable of actively driving high or low without requiring an external pull-up resistor. It can sink up to 5 mA (IO_L) while maintaining VOL ≤ 0.4 V at VDD = 6 V, and source up to 5 mA (IO_H) with VOH ≥ VDD – 0.4 V. This allows direct interfacing with standard CMOS and TTL logic inputs across 1.8 V to 5 V systems, simplifying board design and improving noise immunity.