Texas Instruments TLV809J25DBZR

Overview

TLV809J25DBZR from Texas Instruments is a 3-pin push-pull supply voltage supervisor IC designed for undervoltage monitoring and power-on reset generation in microcontroller, DSP, and FPGA systems. It features a precise 2.25 V threshold voltage (V_IT–), 200 ms fixed reset delay (t_d), 9 µA typical supply current, and operates across –40°C to +85°C. It is used in battery-powered equipment and industrial control systems requiring reliable, low-power reset assertion.

For engineers reviewing the TLV809J25DBZR datasheet, TLV809J25DBZR pinout, TLV809J25DBZR application, or TLV809J25DBZR equivalent, key selection considerations include its fixed 2.25 V detection threshold, push-pull RESET output with no external pull-up required, SOT-23 (DBZ) 3-pin package footprint, and compatibility with 2.5 V rail supervision where 10% hysteresis margin is acceptable.

Technical Context

The TLV809J25DBZR implements a precision bandgap-based voltage reference and comparator to monitor VDD against a factory-trimmed 2.25 V threshold. Its internal oscillator drives a 200 ms timer that delays RESET deassertion after VDD rises above V_IT–, ensuring stable system initialization. The push-pull output stage eliminates need for external pull-up resistors and supports direct interfacing with CMOS inputs.

During power-down, RESET asserts when VDD falls below 2.25 V; during power-up, RESET remains active until VDD exceeds 2.25 V and the 200 ms timer expires. The device enters high-impedance state only below 1.1 V - within its full operating range (2 V to 6 V), it maintains functional reset supervision without external components.

Key Specifications

Pinout & Package

SOT-23 (DBZ) 3-pin plastic package, 2.92 mm × 1.30 mm body size, tape-and-reel delivery (3000 pcs/reel), RoHS-compliant with NiPdAu/Sn lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809J25DBVR, the TLV809J25DBZR provides identical supervision functionality in a narrower SOT-23 variant optimized for space-constrained layouts; compared with MAX809TRD3+T, it delivers tighter threshold tolerance, longer reset hold time, lower power, and eliminates external biasing - making it preferable for new designs prioritizing reliability and integration.

Availability

TLV809J25DBZR is available at Aetrix Electronics and suitable for industrial control PLCs, portable medical devices, smart energy meters, building automation sensors, and factory automation systems requiring stable component supply with guaranteed long-term continuity.

Supply support for TLV809J25DBZR 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, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The TLV809 family was developed specifically for low-power, high-accuracy supply monitoring in processor-based systems - targeting applications where deterministic reset behavior, minimal quiescent current, and small-footprint packaging are critical design constraints.

FAQ

What is the exact threshold voltage of the TLV809J25DBZR and how is it specified?

The TLV809J25DBZR has a nominal threshold voltage (V_IT–) of 2.25 V, with a guaranteed range of 2.20 V to 2.30 V over the full –40°C to +85°C operating temperature range. This value is factory-trimmed and specified in the Electrical Characteristics table under "Negative-going input threshold voltage" for the J25 variant. It is designed to supervise 2.5 V rails with ~10% margin below nominal.

Does the TLV809J25DBZR require an external pull-up resistor on the RESET pin?

No, the TLV809J25DBZR features a push-pull RESET output stage, meaning it actively drives both high and low states without requiring an external pull-up resistor. When asserted, RESET sinks current to GND; when deasserted, it sources current to VDD. This simplifies design, reduces component count, and improves noise immunity compared to open-drain alternatives.

What is the reset delay time of the TLV809J25DBZR and how is it implemented?

The TLV809J25DBZR provides a fixed reset delay time (t_d) of 200 ms (typical), with a guaranteed range of 120 ms to 280 ms. This delay starts when VDD rises above the 2.25 V threshold and is generated by an internal oscillator-driven timer - no external capacitors or resistors are needed. It ensures sufficient hold time for microcontrollers and FPGAs to complete internal initialization.

Can the TLV809J25DBZR be used to monitor a 3.3 V supply?

No - the TLV809J25DBZR is specifically configured for 2.25 V threshold detection and is intended for 2.5 V rail supervision. For 3.3 V supplies, TI recommends the TLV809K33 (2.93 V threshold) or TLV809L30 (2.64 V threshold). Using TLV809J25DBZR on a 3.3 V rail would cause immediate, permanent RESET assertion since 3.3 V far exceeds its 2.25 V trip point.

What package type and markings identify the TLV809J25DBZR?

The TLV809J25DBZR is supplied in a SOT-23 (DBZ) 3-pin package with dimensions 2.92 mm × 1.30 mm. Its top-side marking is "BCMT", which is laser-etched on the package body. This distinguishes it from the DBV variant (marked "VTCI") and confirms compliance with RoHS, MSL Level-1, and NIPDAU/SN lead finish per TI's packaging addendum.