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

Texas Instruments TLV809I50DBZT

Name: TLV809I50DBZT
Brand: Texas Instruments
SKU: TLV809I50DBZT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TLV809I50DBZT

Manufacturer:: Texas Instruments

Category:: Supervisors

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

Datasheet:: TLV809I50DBZT.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23-3

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Product details

Overview

TLV809I50DBZT from Texas Instruments is a 3-pin push-pull supply voltage supervisor IC designed for undervoltage monitoring of 5-V systems. It features a fixed 4.55-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 server power sequencing and industrial control logic initialization.

For engineers reviewing the TLV809I50DBZT datasheet, TLV809I50DBZT pinout, TLV809I50DBZT application, or TLV809I50DBZT equivalent, key selection criteria include precise 4.55-V threshold tolerance (±0.10 V), push-pull RESET output drive capability (4 mA sink), SOT-23 (DBZ) package compatibility, and absence of external timing components.

Technical Context

The TLV809I50DBZT integrates an internal 1.137-V reference, precision resistor divider, comparator, oscillator-based timer, and push-pull output stage. Its reset assertion occurs when V_DD falls below 4.55 V, with hysteresis of 60 mV to prevent chatter during slow supply decay.

During power-up, RESET remains active until V_DD exceeds 4.55 V and sustains a 200-ms delay before deassertion; RESET is valid only above 1.1 V supply. The device requires no external capacitors for timing and uses a 0.1-µF bypass capacitor on V_DD for threshold stability.

Key Specifications

Parameter	Value and Actual Design Meaning
Detection Threshold (V_IT–)	4.55 V ±0.10 V - Ensures reliable reset assertion when 5-V rail drops below 4.55 V, matching 10% under nominal 5-V supply.
Reset Delay Time (t_d)	200 ms (typical) - Guarantees stable processor initialization by holding RESET active for ≥120 ms after V_DD crosses threshold.
Supply Current (I_DD)	9 µA (typical at 2 V) - Enables use in battery-backed systems without significant quiescent drain.
Output Type	Push-pull RESET - Drives high/low actively; eliminates need for external pull-up resistor in most microcontroller interfaces.
Operating Temperature	–40°C to +85°C - Validated for industrial and telecom equipment environments without derating.
ESD Rating (HBM)	±2000 V - Meets IEC 61000-4-2 Level 2 for board-level robustness in factory automation applications.
Package	SOT-23 (DBZ), 2.92 mm × 1.30 mm - Compatible with standard pick-and-place and reflow processes; footprint matches MAX809.

Pinout & Package

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

Pin/Terminal	Circuit Role	Design Meaning
GND (Pin 1)	Ground reference	Low-impedance return path for internal circuitry; must connect directly to system ground plane to maintain threshold accuracy.
RESET (Pin 2)	Active-low push-pull output	Asserts low when V_DD < 4.55 V; deasserts high after 200-ms delay when V_DD rises above threshold; sinks up to 4 mA.
V_DD (Pin 3)	Supply input	Monitored 5-V rail input; requires 0.1-µF ceramic bypass capacitor to GND for noise immunity and threshold stability.

Key Features

Feature	Design Value
Fixed 4.55-V threshold	Matches 5-V system margin requirements; avoids design-in of adjustable supervisors or external resistive dividers.
200-ms power-on reset delay	Guarantees sufficient time for LDOs, clocks, and memory to stabilize before releasing processor from reset.
9-µA typical supply current	Enables integration into always-on subsystems (e.g., RTC backup rails) without compromising battery life.
Push-pull RESET output	Eliminates external pull-up resistor, reducing BOM count and PCB area; supports direct interface to CMOS inputs.
–40°C to +85°C operation	Validated across full industrial temperature range; no parameter drift compensation required in final design.

Applications

Server Power Sequencing	Industrial PLC I/O Module
Use Scenario: Monitors 5-V auxiliary rail powering FPGA configuration logic and communication PHYs during cold start. IC Role / Device Role / Timing Role: Voltage supervisor providing power-on reset signal with 200-ms hold time to ensure FPGA bitstream load completes before PCIe link training begins. Use Value: Prevents metastability in FPGA I/O banks by guaranteeing clean, timed release from reset independent of upstream DC/DC ramp rate.	Use Scenario: Supervises 5-V isolated supply feeding analog input front-end and digital isolator in modular I/O card. IC Role / Device Role / Timing Role: Undervoltage detector asserting RESET to microcontroller when isolated 5-V rail dips below 4.55 V due to field wiring fault or transient overload. Use Value: Enables deterministic safe shutdown of analog acquisition path before ADC reference collapses, preserving measurement integrity.
Smart Electricity Meter MCU	Factory Automation HMI Panel
Use Scenario: Watches main 5-V rail derived from meter's switching power supply during brownout conditions. IC Role / Device Role / Timing Role: Supervisor triggering controlled MCU reset when V_DD falls below 4.55 V, with 60-mV hysteresis preventing oscillation during slow sag. Use Value: Ensures EEPROM write abort and flash state machine rollback occur before supply collapse, avoiding firmware corruption.	Use Scenario: Controls reset timing for ARM Cortex-M7 application processor booting from eMMC in panel PC. IC Role / Device Role / Timing Role: Generates synchronized reset pulse after 5-V core rail reaches regulation, delaying processor release until PMIC outputs settle. Use Value: Eliminates need for discrete RC timing network; reduces layout sensitivity to parasitic capacitance and temperature drift.

Server Power Sequencing

Industrial PLC I/O Module

Use Scenario: Monitors 5-V auxiliary rail powering FPGA configuration logic and communication PHYs during cold start.

IC Role / Device Role / Timing Role: Voltage supervisor providing power-on reset signal with 200-ms hold time to ensure FPGA bitstream load completes before PCIe link training begins.

Use Value: Prevents metastability in FPGA I/O banks by guaranteeing clean, timed release from reset independent of upstream DC/DC ramp rate.

Use Scenario: Supervises 5-V isolated supply feeding analog input front-end and digital isolator in modular I/O card.

IC Role / Device Role / Timing Role: Undervoltage detector asserting RESET to microcontroller when isolated 5-V rail dips below 4.55 V due to field wiring fault or transient overload.

Use Value: Enables deterministic safe shutdown of analog acquisition path before ADC reference collapses, preserving measurement integrity.

Smart Electricity Meter MCU

Factory Automation HMI Panel

Use Scenario: Watches main 5-V rail derived from meter's switching power supply during brownout conditions.

IC Role / Device Role / Timing Role: Supervisor triggering controlled MCU reset when V_DD falls below 4.55 V, with 60-mV hysteresis preventing oscillation during slow sag.

Use Value: Ensures EEPROM write abort and flash state machine rollback occur before supply collapse, avoiding firmware corruption.

Use Scenario: Controls reset timing for ARM Cortex-M7 application processor booting from eMMC in panel PC.

IC Role / Device Role / Timing Role: Generates synchronized reset pulse after 5-V core rail reaches regulation, delaying processor release until PMIC outputs settle.

Use Value: Eliminates need for discrete RC timing network; reduces layout sensitivity to parasitic capacitance and temperature drift.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV809I50DBVT	SOT-23 (DBV) package (2.90 mm × 1.60 mm); identical electrical specs and marking VTBI.	Same 4.55-V threshold and 200-ms delay; DBV has slightly wider body but same pinout and thermal resistance (R_θJA = 242.1°C/W).	Select DBVT if board layout uses DBV footprint or requires higher thermal dissipation margin.
MAX809TRD3+T	4.63-V threshold (±2.5%), 140-ms delay, 12-µA supply current; open-drain output requiring external pull-up.	Lacks push-pull drive; requires additional 10-kΩ resistor; less precise threshold and shorter delay reduce margin in critical 5-V sequencing.	Choose only if legacy MAX809 footprint reuse is mandatory and system can tolerate looser timing and added component.

Compared with TLV809I50DBZT, TLV809I50DBVT offers identical performance in a marginally larger SOT-23 variant, while MAX809TRD3+T trades precision and integrated drive for legacy compatibility-making TLV809I50DBZT optimal for new designs demanding tight 4.55-V monitoring and zero-BOM reset generation.

Availability

TLV809I50DBZT is available at Aetrix Electronics and suitable for server power sequencing, industrial PLC I/O modules, and smart electricity meter MCU supervision requiring stable component supply and guaranteed long-term sourcing.

Supply support for TLV809I50DBZT 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 communications markets.

The TLV809 family was developed specifically for cost-sensitive, space-constrained embedded systems requiring reliable, single-supply voltage monitoring without external components-targeting DSP, FPGA, and microcontroller reset management.

FAQ

What is the exact detection threshold voltage of the TLV809I50DBZT?

The TLV809I50DBZT has a nominal detection threshold (V_IT–) of 4.55 V, with a guaranteed range of 4.45 V to 4.65 V over –40°C to +85°C. This value is factory-trimmed and fixed; it is not adjustable and applies specifically to the TLV809I50DBZT variant-not other members of the TLV809 family.

Does the TLV809I50DBZT require an external capacitor for its reset delay function?

No, the TLV809I50DBZT does not require an external capacitor for its 200-ms reset delay. The timing is generated internally using a precision oscillator and is fixed at 200 ms (120–280 ms over temperature). Only a 0.1-µF ceramic bypass capacitor on the V_DD pin is required for threshold stability.

Is the TLV809I50DBZT pin-compatible with the MAX809 series?

Yes, the TLV809I50DBZT is pin-for-pin compatible with the MAX809 series in the same SOT-23 package. Pin 1 is GND, Pin 2 is RESET (push-pull), and Pin 3 is V_DD. However, note that MAX809 variants typically feature open-drain outputs and different thresholds-so electrical behavior differs despite identical pinout.

What is the maximum sink current capability of the TLV809I50DBZT RESET output?

The TLV809I50DBZT RESET output can sink up to 5 mA continuously, with a typical low-level output voltage (V_OL) of 0.3 V at 500 µA and 0.4 V at 2 mA (V_DD = 3.3 V). This push-pull drive eliminates the need for an external pull-up resistor in most microcontroller reset inputs.

Can the TLV809I50DBZT be used to monitor a 3.3-V supply?

No, the TLV809I50DBZT is specifically calibrated for 5-V systems with a 4.55-V threshold. For 3.3-V monitoring, TI recommends the TLV809K33 (2.93-V threshold). Using TLV809I50DBZT on a 3.3-V rail would cause permanent RESET assertion since 3.3 V < 4.45 V (minimum threshold).

TLV809I50DBZT 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:: 4.55V

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

TLV809I50DBZT FAQ

1.How can I place an order for TLV809I50DBZT through Aetrix?

Please submit a Request for Quotation (RFQ) for TLV809I50DBZT 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 TLV809I50DBZT reliable?

The price and inventory of TLV809I50DBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV809I50DBZT is usually 5 days.

3.What payment methods are accepted for TLV809I50DBZT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLV809I50DBZT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TLV809I50DBZT?

TLV809I50DBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TLV809I50DBZT 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 TLV809I50DBZT?

For technical support, including TLV809I50DBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV809I50DBZT requirements.

6.How does Aetrix verify that TLV809I50DBZT is sourced from the original manufacturer or authorized distributors?

All TLV809I50DBZT 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 TLV809I50DBZT meets industry standards.

7.What is the process for return or replacement of TLV809I50DBZT?

All TLV809I50DBZT units undergo pre-shipment inspection (PSI). If there is an issue with TLV809I50DBZT, 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 TLV809I50DBZT part is unused and in its original packaging.

Return procedure for TLV809I50DBZT:

1.Submit a request within 90 days.

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

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