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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Texas Instruments TLV809K33DBZR

Name: TLV809K33DBZR
Brand: Texas Instruments
SKU: TLV809K33DBZR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TLV809K33DBZR

Manufacturer:: Texas Instruments

Category:: Supervisors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: TLV809K33DBZR.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23-3

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Product details

Overview

TLV809K33DBZR 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 detection threshold (V_IT–), 200-ms reset delay (t_d), 9-µA typical supply current, and operates across –40°C to +85°C. It is used in DSP/FPGA power sequencing and microcontroller reset assertion during brownout conditions.

For engineers reviewing the TLV809K33DBZR datasheet, TLV809K33DBZR pinout, TLV809K33DBZR application, or TLV809K33DBZR equivalent, key selection criteria include precise 2.93-V threshold tolerance (±60 mV), push-pull RESET output drive capability (4 mA sink), SOT-23 (DBZ) package footprint, and compatibility with 3.3-V LDO-supplied digital logic rails.

Technical Context

The TLV809K33DBZR implements an internal bandgap reference (1.137 V) and resistor divider to generate its 2.93-V negative-going threshold. Its push-pull RESET output actively drives high or low without external pull-up, eliminating timing uncertainty from RC networks.

During power-up, RESET asserts when V_DD exceeds 1.1 V and remains active until V_DD rises above 2.93 V and sustains for 200 ms; on power-down, RESET reasserts immediately when V_DD falls below 2.87 V (min), with 40-mV hysteresis ensuring noise immunity.

Key Specifications

Parameter	Value and Actual Design Meaning
Threshold voltage (V_IT–)	2.93 V (nominal); ensures reliable reset assertion when 3.3-V rail drops below 2.87 V min)
Reset delay time (t_d)	200 ms (typical); guarantees full system initialization before release of processor reset line)
Supply current (I_DD)	9 µA (typical at 2 V); enables use in battery-backed or ultra-low-power wake-up circuits)
Output type	Push-pull; eliminates need for external pull-up resistor and supports direct interface to CMOS inputs)
Operating temperature	–40°C to +85°C; validated for industrial-grade embedded control and factory automation environments)
Hysteresis (V_hys)	40 mV; prevents oscillatory reset behavior during slow or noisy supply transitions)
Max V_DD	6.5 V absolute max; allows safe operation with 5-V tolerant supplies or transient overvoltage margin)

Pinout & Package

SOT-23 (DBZ) package: 2.92 mm × 1.30 mm body, 3-pin surface-mount, RoHS-compliant, NIPDAU/SN lead finish, MSL Level-1.

Pin/Terminal	Circuit Role	Design Meaning
GND (Pin 1)	Ground reference	Low-impedance return path required; connects directly to PCB ground plane to minimize noise coupling into threshold comparator)
RESET (Pin 2)	Active-low push-pull output	Drives CMOS reset input directly; sinks up to 5 mA or sources up to 5 mA; no external components needed)
V_DD (Pin 3)	Supply input	Accepts 2 V to 6 V; requires 0.1-µF ceramic bypass capacitor to GND for stable threshold accuracy)

Key Features

Feature	Design Value
Precision 2.93-V threshold	Fixed internal divider ensures ±2.0% accuracy over temperature; matches 3.3-V rail's 15% dropout limit per design requirement)
200-ms power-on reset delay	Internally timed; eliminates need for external RC network and associated layout sensitivity or drift)
Push-pull RESET output	Active drive in both states reduces system-level timing uncertainty and simplifies FPGA/ASIC reset interface)
Ultra-low 9-µA supply current	Enables integration into always-on monitoring paths without impacting battery life in portable equipment)
Transient rejection	Immune to fast V_DD transients <10 µs duration; prevents spurious resets during switching noise or load dumps)

Applications

Factory Automation	Portable Equipment
Use Scenario: Monitoring 3.3-V PLC I/O module power rail subject to motor-induced transients. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET to ARM Cortex-M7 MCU upon undervoltage. Use Value: Prevents firmware corruption by guaranteeing 200-ms minimum reset hold time after rail recovery.	Use Scenario: Battery-powered handheld meter with 3.3-V LDO supplying RF transceiver and sensor ADC. IC Role / Device Role / Timing Role: Brownout detector triggering controlled shutdown before EEPROM write failure. Use Value: 9-µA quiescent current extends shelf life; 40-mV hysteresis avoids chatter during battery sag.
Servers	Building Automation
Use Scenario: 3.3-V auxiliary rail powering BMC (Baseboard Management Controller) in rack server. IC Role / Device Role / Timing Role: Ensures BMC reset occurs only after main 12-V and 3.3-V rails stabilize within spec. Use Value: Push-pull output interfaces directly to BMC's dedicated reset pin without pull-up resistor.	Use Scenario: Smart HVAC controller using 3.3-V rail derived from isolated DC-DC converter. IC Role / Device Role / Timing Role: Supervises isolated supply integrity to prevent erratic actuator commands during line sags. Use Value: –40°C to +85°C rating supports deployment in unconditioned mechanical rooms.

Factory Automation

Portable Equipment

Use Scenario: Monitoring 3.3-V PLC I/O module power rail subject to motor-induced transients.

IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET to ARM Cortex-M7 MCU upon undervoltage.

Use Value: Prevents firmware corruption by guaranteeing 200-ms minimum reset hold time after rail recovery.

Use Scenario: Battery-powered handheld meter with 3.3-V LDO supplying RF transceiver and sensor ADC.

IC Role / Device Role / Timing Role: Brownout detector triggering controlled shutdown before EEPROM write failure.

Use Value: 9-µA quiescent current extends shelf life; 40-mV hysteresis avoids chatter during battery sag.

Servers

Building Automation

Use Scenario: 3.3-V auxiliary rail powering BMC (Baseboard Management Controller) in rack server.

IC Role / Device Role / Timing Role: Ensures BMC reset occurs only after main 12-V and 3.3-V rails stabilize within spec.

Use Value: Push-pull output interfaces directly to BMC's dedicated reset pin without pull-up resistor.

Use Scenario: Smart HVAC controller using 3.3-V rail derived from isolated DC-DC converter.

IC Role / Device Role / Timing Role: Supervises isolated supply integrity to prevent erratic actuator commands during line sags.

Use Value: –40°C to +85°C rating supports deployment in unconditioned mechanical rooms.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV809K33DBVR	SOT-23 (DBV) package: 2.90 mm × 1.60 mm; identical electrical specs and marking "VTRI"	Same 2.93-V threshold and 200-ms delay; DBV has slightly larger body but same pinout	Select DBVR for legacy board layouts using DBV footprint; DBZR preferred for space-constrained designs due to narrower 1.30-mm width
MAX809TRD33+T	2.93-V threshold, 200-ms delay, but open-drain RESET output requiring external pull-up	Lacks push-pull drive; adds BOM cost and layout area; lower ESD rating (HBM ±1.5 kV vs TLV809's ±2 kV)	Choose only if MAX809 footprint is already committed; TLV809K33DBZR offers superior noise immunity and simplified interface

Compared with TLV809K33DBVR, the DBZR variant saves 0.3 mm in width for dense PCB layouts; versus MAX809TRD33+T, it eliminates pull-up dependency and improves ESD robustness-critical for industrial field deployments.

Availability

TLV809K33DBZR is available at Aetrix Electronics and suitable for factory automation, portable equipment, and building automation applications requiring stable component supply and long-term industrial lifecycle support.

Supply support for TLV809K33DBZR 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 and embedded processing solutions, with core expertise in precision analog, power management, and signal chain technologies.

The TLV809 family is part of TI's supervisory IC portfolio, engineered specifically for reliable power-on reset generation and undervoltage protection in DSP, FPGA, and microcontroller-based systems operating from 2.5-V to 5-V rails.

FAQ

What is the exact threshold voltage of the TLV809K33DBZR and how is it specified?

The TLV809K33DBZR has a nominal negative-going threshold voltage (V_IT–) of 2.93 V, with a guaranteed range of 2.87 V to 2.99 V over –40°C to +85°C. This value is fixed by an internal resistor divider and referenced to TI's 1.137-V bandgap, enabling precise supervision of 3.3-V supplies without external components. The TLV809K33DBZR datasheet specifies this in Section 7.5 Electrical Characteristics under "VIT– Negative-going input threshold voltage".

Does the TLV809K33DBZR require an external pull-up resistor on the RESET pin?

No, the TLV809K33DBZR does not require an external pull-up resistor because it features a push-pull RESET output stage capable of actively driving high or low. This eliminates timing uncertainty and board space associated with RC networks. The TLV809K33DBZR can directly interface with CMOS inputs such as those found on TI C2000™ MCUs or Xilinx Artix-7 FPGAs without additional components.

What is the power-up behavior of the TLV809K33DBZR when VDD rises from 0 V?

When V_DD rises from 0 V, the TLV809K33DBZR asserts RESET (low) once V_DD exceeds 1.1 V. RESET remains asserted until V_DD rises above the 2.93-V threshold and sustains for the full 200-ms internal delay (t_d). During this period, the TLV809K33DBZR ensures the host processor remains held in reset, preventing premature execution before power stabilization.

Can the TLV809K33DBZR be used to monitor a 5-V supply?

No-the TLV809K33DBZR is specifically calibrated for 3.3-V systems with a 2.93-V threshold. For 5-V supply monitoring, TI recommends the TLV809I50DBZR (4.55-V threshold). Using TLV809K33DBZR on a 5-V rail would cause immediate, permanent RESET assertion since 5 V far exceeds its 2.93-V trip point. Always match the TLV809K33DBZR to a 3.3-V nominal supply.

What package and marking does the TLV809K33DBZR use, and how is it identified on the device?

The TLV809K33DBZR uses the SOT-23 (DBZ) package with dimensions 2.92 mm × 1.30 mm. Its top-side marking is "BCMX", which is laser-etched on the package body. This marking is confirmed in TI's official Package Option Addendum and distinguishes it from DBV variants (marked "VTRI") and other TLV809 thresholds. The "DBZR" suffix in TLV809K33DBZR explicitly denotes the DBZ package with tape-and-reel packaging (3000 units/reel).

TLV809K33DBZR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 2.93V

Output:: Push-Pull, Totem Pole

Reset:: Active Low

Reset Timeout:: 120ms Minimum

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

TLV809K33DBZR FAQ

1.How can I place an order for TLV809K33DBZR through Aetrix?

Please submit a Request for Quotation (RFQ) for TLV809K33DBZR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TLV809K33DBZR reliable?

The price and inventory of TLV809K33DBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV809K33DBZR is usually 5 days.

3.What payment methods are accepted for TLV809K33DBZR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLV809K33DBZR transactions.

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4.How is shipping managed for TLV809K33DBZR?

TLV809K33DBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TLV809K33DBZR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TLV809K33DBZR?

For technical support, including TLV809K33DBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV809K33DBZR requirements.

6.How does Aetrix verify that TLV809K33DBZR is sourced from the original manufacturer or authorized distributors?

All TLV809K33DBZR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TLV809K33DBZR meets industry standards.

7.What is the process for return or replacement of TLV809K33DBZR?

All TLV809K33DBZR units undergo pre-shipment inspection (PSI). If there is an issue with TLV809K33DBZR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TLV809K33DBZR part is unused and in its original packaging.

Return procedure for TLV809K33DBZR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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