Texas Instruments TLV809K33DBVR

Overview

TLV809K33DBVR from Texas Instruments is a 3-pin push-pull supply voltage supervisor IC designed for undervoltage monitoring of 3.3-V systems. It features a fixed 2.93-V threshold (±60 mV hysteresis), 200-ms reset delay, 9-µA typical supply current, and operates across –40°C to +85°C - used in DSP/FPGA power sequencing and system initialization.

For engineers reviewing the TLV809K33DBVR datasheet, TLV809K33DBVR pinout, TLV809K33DBVR application, or TLV809K33DBVR equivalent, key selection criteria include precise 2.93-V detection accuracy, push-pull RESET output drive capability, SOT-23 (DBV) package compatibility, and immunity to fast VDD transients per tw ≥ 10 µs.

Technical Context

The TLV809K33DBVR implements a precision bandgap-based voltage reference (1.137 V) with resistor-divider scaling to set its 2.93-V negative-going threshold (VIT–). Its internal oscillator drives a timer that enforces a 200-ms minimum RESET deassertion delay after VDD rises above VIT–.

RESET is a push-pull output capable of sourcing up to 5 mA and sinking up to 5 mA, eliminating external pull-up resistors. The device asserts RESET when VDD falls below 2.93 V or during power-up until VDD exceeds 1.1 V and remains above threshold for td = 200 ms.

Key Specifications

Pinout & Package

SOT-23 (DBV) package: 2.90 mm × 1.60 mm body, 3-pin surface-mount, RoHS-compliant, NIPDAU lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809K33DBVR, TLV809K33DBZR offers identical supervision functionality in a marginally smaller SOT-23 variant, while MAX809TRD33+T requires board-level redesign to accommodate open-drain output and external biasing - making TLV809K33DBVR the optimal choice for new designs prioritizing integration and low power.

Availability

TLV809K33DBVR is available at Aetrix Electronics and suitable for factory automation, portable equipment, and server management systems requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TLV809K33DBVR 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 is part of TI's precision voltage supervisor product line, engineered specifically for reliable power-on reset and undervoltage protection in processor-based systems such as DSPs, FPGAs, and ASICs.

FAQ

What is the exact supply voltage threshold of the TLV809K33DBVR?

The TLV809K33DBVR has a nominal negative-going input threshold voltage (VIT–) of 2.93 V, with a guaranteed range of 2.87 V to 2.99 V over –40°C to +85°C. This threshold is factory-trimmed and internally fixed - no external adjustment is possible. The value is optimized to monitor 3.3-V supplies with ~10% headroom, and hysteresis is 40 mV to prevent chatter near the trip point. TLV809K33DBVR uses this precise threshold to ensure deterministic reset behavior in real-world 3.3-V rail conditions.

Does the TLV809K33DBVR require an external pull-up resistor on the RESET pin?

No, the TLV809K33DBVR features a push-pull RESET output stage capable of both sourcing and sinking current (up to ±5 mA), so no external pull-up resistor is required. This differs from open-drain supervisors like the TLV803 series. The push-pull architecture reduces component count, eliminates pull-up leakage current, and ensures faster, more robust reset signaling - especially critical in low-power portable devices. TLV809K33DBVR delivers this integrated drive capability in the same compact SOT-23 footprint.

What is the power-up behavior of the TLV809K33DBVR?

During power-up, TLV809K33DBVR asserts RESET when VDD rises above 1.1 V and holds it active until VDD exceeds the 2.93-V threshold and remains stable for the full 200-ms internal delay. If VDD drops below 2.93 V at any point - even after initial release - RESET reasserts immediately. This dual-stage behavior ensures the monitored system remains held in reset until both minimum operating voltage and timing stability are confirmed. TLV809K33DBVR's behavior is fully self-contained and requires no external timing components.

Can the TLV809K33DBVR be used to supervise voltages other than 3.3 V?

The TLV809K33DBVR is specifically calibrated for 3.3-V systems with a 2.93-V threshold; it is not intended for general-purpose voltage monitoring. While its VDD operating range spans 2 V to 6 V, the detection threshold is fixed and unadjustable. For 2.5-V, 3.0-V, or 5.0-V rails, TI offers dedicated variants: TLV809J25 (2.25 V), TLV809L30 (2.64 V), and TLV809I50 (4.55 V). Using TLV809K33DBVR outside its designated 3.3-V context risks incorrect reset timing or failure to detect actual undervoltage conditions.

Is the TLV809K33DBVR pin-compatible with the MAX809 series?

Yes, the TLV809K33DBVR is explicitly designed as a pin-for-pin compatible alternative to the MAX809 family, including the MAX809TRD33+. Both use identical SOT-23 pinout (GND, RESET, VDD) and share the same 2.93-V threshold and 200-ms delay. However, TLV809K33DBVR uses a push-pull RESET output, whereas MAX809 variants are open-drain - meaning direct substitution requires verifying whether the target system expects active pull-up or relies on external biasing. TLV809K33DBVR maintains mechanical compatibility but improves electrical integration.