Texas Instruments TLV809J25DBZT

Overview

TLV809J25DBZT from Texas Instruments is a 3-pin supply voltage supervisor IC with a fixed 2.25 V detection threshold, push-pull active-low RESET output, 200 ms reset delay, 9 µA typical supply current, and operation over –40°C to +85°C - used for reliable power-on reset in microcontroller and FPGA systems.

For engineers reviewing the TLV809J25DBZT datasheet, TLV809J25DBZT pinout, TLV809J25DBZT application, or TLV809J25DBZT equivalent, key selection criteria include precise undervoltage detection at 2.25 V ±0.05 V, push-pull drive capability (IOH = –500 µA, IOL = 500 µA), SOT-23 (DBZ) package compatibility, and immunity to fast VDD transients per tw ≥10 µs.

Technical Context

The TLV809J25DBZT integrates an internal 1.137 V reference, precision resistor divider, comparator, oscillator-based timer, and push-pull output stage to generate a clean, glitch-free RESET signal during power-up and brownout events. Its fixed 2.25 V threshold targets 2.5 V rail monitoring with 10% hysteresis margin.

It operates across 2 V to 6 V supply range, asserts RESET when VDD falls below 2.25 V (VIT–), deasserts after 200 ms (typical) once VDD rises above threshold, and remains functional down to VDD = 1.1 V - enabling robust initialization before core logic becomes active.

Key Specifications

Pinout & Package

SOT-23 (DBZ) package: 2.92 mm × 1.30 mm body, 3-pin surface-mount, RoHS-compliant, moisture sensitivity level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809J25DBZT, TLV809J25DBVT offers identical functionality in a slightly wider SOT-23 variant but requires layout verification, while MAX809TRD3+T introduces interface and timing compromises that impact reliability in low-power or precision 2.5 V monitoring roles.

Availability

TLV809J25DBZT is available at Aetrix Electronics and suitable for factory automation, portable equipment, and smart metering applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TLV809J25DBZT 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 delivering analog, embedded processing, and connectivity solutions with focus on reliability, energy efficiency, and system-level innovation.

The TLV809 family is designed specifically for cost-sensitive, space-constrained power-supply monitoring in DSP, FPGA, and microcontroller-based systems - emphasizing precision threshold accuracy, minimal quiescent current, and robust transient immunity.

FAQ

What is the exact reset threshold voltage of TLV809J25DBZT?

The TLV809J25DBZT has a guaranteed negative-going input threshold voltage (V_IT–) of 2.25 V, with a min/max range of 2.20 V to 2.30 V across –40°C to +85°C. This value is factory-trimmed and specified in Section 7.5 of the official TI datasheet SLVSA03F. The 2.25 V threshold is optimized for monitoring nominal 2.5 V supplies with ~10% headroom.

Does TLV809J25DBZT require an external pull-up resistor on the RESET pin?

No, TLV809J25DBZT features a push-pull output stage on its RESET pin (Pin 2), eliminating the need for an external pull-up resistor. It actively drives high (VOH ≥ VDD – 0.2 V at 500 µA) and low (VOL ≤ 0.3 V at 500 µA), unlike open-drain supervisors such as the TLV803 series. This simplifies PCB layout and improves noise immunity in noisy industrial environments.

What is the recommended bypass capacitor for TLV809J25DBZT?

A 0.1 µF ceramic capacitor is recommended between the VDD (Pin 3) and GND (Pin 1) pins of TLV809J25DBZT, placed as close as possible to the device. This minimizes supply noise coupling into the internal reference and comparator, ensuring stable threshold detection and preventing false resets - especially critical during fast load transients or EMI exposure.

Can TLV809J25DBZT operate with a 1.8 V supply?

No, TLV809J25DBZT is not specified for 1.8 V operation. Its recommended operating range is 2 V to 6 V (Section 7.3), and it asserts RESET below 1.1 V. At 1.8 V, the internal reference and comparator may not function reliably, and electrical characteristics including V_IT–, t_d, and I_DD are not guaranteed. For 1.8 V systems, consider the TLV809E series or alternative supervisors rated down to 1.6 V.

How does TLV809J25DBZT handle fast supply transients?

TLV809J25DBZT rejects transients shorter than 10 µs (t_w minimum, Section 7.6) regardless of amplitude, preventing spurious resets from switching noise or ESD-induced dips. Transients longer than 10 µs and deeper than the hysteresis window (30 mV) will trigger RESET assertion. This behavior is inherent to the internal timing architecture and requires no external components.