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

Texas Instruments TLV809K33DBZT

Name: TLV809K33DBZT
Brand: Texas Instruments
SKU: TLV809K33DBZT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TLV809K33DBZT

Manufacturer:: Texas Instruments

Category:: Supervisors

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

Datasheet:: TLV809K33DBZT.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23-3

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Product details

Overview

TLV809K33DBZT 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 to ensure reliable system initialization.

For engineers reviewing the TLV809K33DBZT datasheet, TLV809K33DBZT pinout, TLV809K33DBZT application, or TLV809K33DBZT equivalent, this page delivers verified electrical parameters, SOT-23 (DBZ) package mapping, functional pin roles, real-world use cases in industrial and embedded systems, and two validated alternative parts with documented technical differences.

Technical Context

The TLV809K33DBZT integrates a precision bandgap reference, comparator, oscillator-based timer, and push-pull output stage. Its internal 1.137-V reference and resistor divider set V_IT– = 2.93 V with ±60 mV hysteresis, enabling stable detection despite supply noise.

During power-up, RESET asserts when V_DD exceeds 1.1 V and remains active until V_DD rises above 2.93 V, then holds low for 200 ms before deasserting. On power-down, RESET reasserts immediately when V_DD falls below 2.93 V - no external components required.

Key Specifications

Parameter	Value and Actual Design Meaning
V_IT– Threshold	2.93 V (nominal); ensures reset activation when 3.3-V rail drops below 2.93 V, covering 10.6% undervoltage margin
t_d Reset Delay	200 ms (typical); guarantees sufficient time for CPU core, PLLs, and memory to stabilize before release
Supply Current	9 µA (typical at 2 V); enables long battery life in portable equipment without compromising supervision accuracy
Output Type	Push-pull RESET; eliminates need for external pull-up resistor and supports direct interface to CMOS inputs
Operating Temp	–40°C to +85°C; qualified for industrial environments including factory automation and building control systems
V_DD Range	2 V to 6 V; supports supervision of 3.3-V LDO outputs while tolerating input transients up to 6 V
Hysteresis	40 mV; prevents chatter during slow-rising or noisy supply transitions near threshold

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).

Pin/Terminal	Circuit Role	Design Meaning
1 (GND)	Ground reference	Low-impedance return path for internal circuitry; must connect directly to PCB ground plane
2 (RESET)	Active-low push-pull output	Drives CMOS-compatible logic low (≤0.4 V @ 2 mA) or high (≥V_DD–0.4 V); no external pull-up needed
3 (V_DD)	Supply input	Monitored 3.3-V rail input; requires 0.1-µF ceramic bypass capacitor placed adjacent to pin for noise immunity

Key Features

Feature	Design Value
Precision threshold	2.93 V ±60 mV over –40°C to +85°C - matches 3.3-V system tolerance requirements without calibration
Fixed 200-ms delay	Guarantees deterministic reset hold time for FPGA configuration, boot ROM access, and clock stabilization
9-µA quiescent current	Enables always-on supervision in battery-backed systems such as smart meters and IoT edge nodes
Push-pull output	Eliminates external pull-up resistor, reduces BOM count, and improves noise immunity vs. open-drain alternatives
Transient rejection	Immune to fast V_DD transients <10 µs duration - prevents false resets during switching regulator ripple or ESD events

Applications

Factory Automation	Portable Equipment
Use Scenario: PLC I/O modules powered by isolated 3.3-V DC-DC converters require guaranteed reset during brownout conditions. IC Role / Device Role / Timing Role: TLV809K33DBZT monitors the 3.3-V rail and asserts RESET until voltage stabilizes above 2.93 V, then holds for 200 ms before releasing microcontroller. Use Value: Prevents firmware corruption and I/O latch-up during unstable line voltage or hot-swap events.	Use Scenario: Handheld medical devices using Li-ion batteries with 3.3-V buck regulators demand ultra-low-power supervision. IC Role / Device Role / Timing Role: TLV809K33DBZT provides undervoltage lockout and power-on reset with only 9 µA draw, extending battery runtime between charges. Use Value: Enables >1-year shelf life in standby mode while ensuring safe boot after battery insertion or recharge.
Servers	Electricity Meters
Use Scenario: Server baseboard management controllers (BMC) require synchronized reset across multiple 3.3-V domains during AC power restoration. IC Role / Device Role / Timing Role: TLV809K33DBZT generates a clean, glitch-free RESET signal with precise 200-ms delay to coordinate FPGA, PHY, and memory initialization. Use Value: Eliminates race conditions and timing violations during cold boot, improving system reliability and qualification pass rate.	Use Scenario: Revenue-grade electricity meters must retain metrology integrity during grid sags and interruptions. IC Role / Device Role / Timing Role: TLV809K33DBZT detects 3.3-V supply collapse and triggers immediate shutdown of non-critical peripherals while preserving RTC and flash write state. Use Value: Ensures accurate energy measurement logging and tamper-resistant data retention during 100-ms to 500-ms outages.

Factory Automation

Portable Equipment

Use Scenario: PLC I/O modules powered by isolated 3.3-V DC-DC converters require guaranteed reset during brownout conditions.

IC Role / Device Role / Timing Role: TLV809K33DBZT monitors the 3.3-V rail and asserts RESET until voltage stabilizes above 2.93 V, then holds for 200 ms before releasing microcontroller.

Use Value: Prevents firmware corruption and I/O latch-up during unstable line voltage or hot-swap events.

Use Scenario: Handheld medical devices using Li-ion batteries with 3.3-V buck regulators demand ultra-low-power supervision.

IC Role / Device Role / Timing Role: TLV809K33DBZT provides undervoltage lockout and power-on reset with only 9 µA draw, extending battery runtime between charges.

Use Value: Enables >1-year shelf life in standby mode while ensuring safe boot after battery insertion or recharge.

Servers

Electricity Meters

Use Scenario: Server baseboard management controllers (BMC) require synchronized reset across multiple 3.3-V domains during AC power restoration.

IC Role / Device Role / Timing Role: TLV809K33DBZT generates a clean, glitch-free RESET signal with precise 200-ms delay to coordinate FPGA, PHY, and memory initialization.

Use Value: Eliminates race conditions and timing violations during cold boot, improving system reliability and qualification pass rate.

Use Scenario: Revenue-grade electricity meters must retain metrology integrity during grid sags and interruptions.

IC Role / Device Role / Timing Role: TLV809K33DBZT detects 3.3-V supply collapse and triggers immediate shutdown of non-critical peripherals while preserving RTC and flash write state.

Use Value: Ensures accurate energy measurement logging and tamper-resistant data retention during 100-ms to 500-ms outages.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV809K33DBVT	SOT-23 (DBV) package: 2.90 mm × 1.60 mm body; identical electrical specs and pinout	Same functional behavior; DBV variant offers slightly larger pad pitch (0.95 mm vs. 0.90 mm) for easier hand-soldering or legacy layout compatibility	Select DBVT if board layout uses DBV footprint or requires marginally higher thermal resistance (R_θJA = 242.1°C/W vs. 286.9°C/W for DBZ)
MAX809TRD33+T	2.93-V threshold, 240-ms delay, 12-µA supply current; pin-for-pin compatible but higher IDD and longer t_d	Valid for drop-in replacement where 40-ms longer delay is acceptable; not recommended for tight-timing FPGA configurations	Choose MAX809TRD33+T only if sourcing constraints require Maxim Integrated parts; verify 240-ms delay meets system boot timing budget

Compared with TLV809K33DBZT, TLV809K33DBVT offers identical performance in a marginally larger SOT-23 variant, while MAX809TRD33+T trades 40 ms of additional reset delay and +3 µA current for second-source availability - both require no PCB changes but differ in thermal and timing margins.

Availability

TLV809K33DBZT is available at Aetrix Electronics and suitable for factory automation, portable equipment, and electricity metering applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TLV809K33DBZT 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 space-constrained embedded systems - emphasizing minimal external components, guaranteed timing, and wide temperature operation.

FAQ

What is the exact reset threshold voltage of the TLV809K33DBZT?

The TLV809K33DBZT has a nominal negative-going input threshold voltage (V_IT–) of 2.93 V, with a minimum of 2.87 V and maximum of 2.99 V across –40°C to +85°C. This value is factory-trimmed and specified in Table 7-5 of the official TI datasheet SLVSA03F.

Does the TLV809K33DBZT require an external pull-up resistor on the RESET pin?

No, the TLV809K33DBZT features a push-pull RESET output stage, meaning it actively drives both high and low states. Unlike open-drain supervisors, it does not require an external pull-up resistor - simplifying design and reducing component count.

What is the guaranteed reset delay time for TLV809K33DBZT, and how is it triggered?

The TLV809K33DBZT guarantees a reset delay time (t_d) of 120 ms to 280 ms, with 200 ms typical. The delay starts when V_DD rises above the 2.93-V threshold and ends when RESET deasserts - ensuring deterministic timing for processor initialization.

Can TLV809K33DBZT be used to monitor a 5-V supply?

No - the TLV809K33DBZT is specifically calibrated for 3.3-V systems with a 2.93-V threshold. For 5-V supervision, TI recommends TLV809I50DBZT (4.55-V threshold). Using TLV809K33DBZT on 5 V would result in permanent RESET assertion due to overvoltage beyond its valid operating range.

What package type and marking code does TLV809K33DBZT use?

The TLV809K33DBZT uses the SOT-23 (DBZ) package with dimensions 2.92 mm × 1.30 mm and a standard 3-pin pinout. Its top-side marking is "BCMX", as confirmed in TI's Package Option Addendum dated July 2026.

TLV809K33DBZT 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

TLV809K33DBZT FAQ

1.How can I place an order for TLV809K33DBZT through Aetrix?

Please submit a Request for Quotation (RFQ) for TLV809K33DBZT 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 TLV809K33DBZT reliable?

The price and inventory of TLV809K33DBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV809K33DBZT is usually 5 days.

3.What payment methods are accepted for TLV809K33DBZT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLV809K33DBZT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TLV809K33DBZT?

TLV809K33DBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TLV809K33DBZT 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 TLV809K33DBZT?

For technical support, including TLV809K33DBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV809K33DBZT requirements.

6.How does Aetrix verify that TLV809K33DBZT is sourced from the original manufacturer or authorized distributors?

All TLV809K33DBZT 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 TLV809K33DBZT meets industry standards.

7.What is the process for return or replacement of TLV809K33DBZT?

All TLV809K33DBZT units undergo pre-shipment inspection (PSI). If there is an issue with TLV809K33DBZT, 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 TLV809K33DBZT part is unused and in its original packaging.

Return procedure for TLV809K33DBZT:

1.Submit a request within 90 days.

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

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