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

Texas Instruments TPS3823-33DBVT

Name: TPS3823-33DBVT
Brand: Texas Instruments
SKU: TPS3823-33DBVT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TPS3823-33DBVT

Manufacturer:: Texas Instruments

Category:: Supervisors

Package:: SC-74A, SOT-753

Datasheet:: TPS3823-33DBVT.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23-5

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Product details

Overview

TPS3823-33DBVT from Texas Instruments is a 3.3V supply voltage supervisor IC with integrated watchdog timer, active-low push-pull reset output, manual reset input, and 200ms power-on reset delay. It monitors VDD for undervoltage conditions, asserts RESET when VDD falls below 2.93V (typ), and provides system-level reliability in microcontroller-based embedded systems.

For engineers reviewing the TPS3823-33DBVT datasheet, TPS3823-33DBVT pinout, TPS3823-33DBVT application, or TPS3823-33DBVT equivalent, key selection criteria include its fixed 3.3V threshold (±2.5% over −40°C to 85°C), 1.6s watchdog timeout, 15μA quiescent current, SOT-23-5 package compatibility, and MR/WDI interface timing requirements.

Technical Context

The TPS3823-33DBVT implements a precision bandgap reference and comparator-based supervision architecture with internal hysteresis (50mV) to reject supply noise. Its watchdog timer requires periodic falling-edge transitions on WDI to prevent timeout; absence triggers a 200ms reset pulse. The device uses an internal voltage divider to set V_IT− = 2.93V (nominal) without external components.

Reset assertion occurs when VDD drops below V_IT−, and release is delayed until VDD rises above V_IT− + V_HYS. The MR pin forces immediate reset regardless of VDD level or watchdog state, with internal 90kΩ pullup. All logic inputs (MR, WDI) are CMOS-compatible with rail-to-rail voltage thresholds.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply voltage threshold	2.93V (nominal), ±2.5% over −40°C to 85°C - ensures reliable 3.3V rail monitoring with margin against brownout
Watchdog timeout	1.6s (nominal) - provides robust fault detection window for firmware execution cycles
Reset delay time	200ms (nominal) - guarantees sufficient processor initialization time after power stabilization
Quiescent current	15μA (typical) - enables use in battery-powered and low-power always-on systems
Hysteresis	50mV - prevents oscillatory reset behavior during slow or noisy VDD transitions
Input leakage	±160μA max at MR/WDI - supports direct connection to MCU GPIO without external buffering
Operating temperature	−40°C to 85°C - qualified for industrial-grade embedded applications

Pinout & Package

TPS3823-33DBVT is housed in a 5-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, optimized for space-constrained PCB layouts and compatible with standard pick-and-place assembly.

Pin/Terminal	Circuit Role	Design Meaning
VDD (Pin 5)	Power supply input and monitored rail	Supplies device operation and serves as the voltage source under supervision; operates from 1.1V to 5.5V
GND (Pin 2)	Ground reference	Common return path for all internal circuitry and reset output stage
RESET (Pin 1)	Active-low push-pull reset output	Drives microcontroller reset pin directly; sinks up to 3mA while asserted, no external pullup required
MR (Pin 3)	Manual reset input	CMOS-compatible active-low signal; internally pulled up to VDD via 90kΩ resistor; asserts reset immediately when pulled low
WDI (Pin 4)	Watchdog timer input	Falling-edge-triggered; must be toggled within 1.6s to prevent timeout; floats high internally if left unconnected

Key Features

Feature	Design Value
Fixed 3.3V supervision threshold	Eliminates need for external resistive divider or trimming, reducing BOM count and layout area
Integrated 1.6s watchdog timer	Enables autonomous firmware health monitoring without dedicated timer peripherals or software overhead
200ms power-on reset delay	Guarantees stable power delivery before releasing processor from reset, preventing boot failures
15μA supply current	Minimizes standby power draw in always-on supervisory functions, critical for portable equipment
MR and WDI with internal pullup	Reduces external component count and simplifies interface to microcontrollers with open-drain or weak-drive I/O

Applications

Microcontroller Power Sequencing	Industrial PLC Supervision
Use Scenario: Ensuring clean startup and runtime fault recovery for MSP430C325 and similar 3.3V MCUs in sensor nodes. IC Role / Device Role / Timing Role: Monitors 3.3V supply rail, asserts active-low RESET during brownout, and triggers watchdog reset if firmware hangs. Use Value: Prevents corrupted memory writes and undefined state by enforcing deterministic reset timing and watchdog-enforced recovery.	Use Scenario: Maintaining operational integrity in programmable logic controllers exposed to voltage transients and EMI. IC Role / Device Role / Timing Role: Provides dual-layer protection: supply voltage supervision with 50mV hysteresis and 1.6s watchdog timeout for control loop monitoring. Use Value: Eliminates need for discrete RC reset circuits and external watchdog ICs, improving long-term reliability and reducing board footprint.
Battery-Powered IoT Gateway	Wireless Baseband Processor Reset
Use Scenario: Managing power-up sequencing and runtime supervision in LTE-M/NB-IoT gateways with intermittent power sources. IC Role / Device Role / Timing Role: Delivers 200ms reset hold time after VDD stabilizes and monitors WDI for host processor liveliness during deep-sleep wake cycles. Use Value: Enables ultra-low-power operation (15μA) while maintaining fail-safe reset capability across sleep/wake transitions.	Use Scenario: Coordinating reset timing between baseband processors and RF transceivers in 5G small-cell equipment. IC Role / Device Role / Timing Role: Generates synchronized active-low RESET pulses with precise 200ms duration and validates processor responsiveness via WDI. Use Value: Avoids race conditions during power-up and ensures transceiver initialization completes only after baseband is fully ready.

Microcontroller Power Sequencing

Industrial PLC Supervision

Use Scenario: Ensuring clean startup and runtime fault recovery for MSP430C325 and similar 3.3V MCUs in sensor nodes.

IC Role / Device Role / Timing Role: Monitors 3.3V supply rail, asserts active-low RESET during brownout, and triggers watchdog reset if firmware hangs.

Use Value: Prevents corrupted memory writes and undefined state by enforcing deterministic reset timing and watchdog-enforced recovery.

Use Scenario: Maintaining operational integrity in programmable logic controllers exposed to voltage transients and EMI.

IC Role / Device Role / Timing Role: Provides dual-layer protection: supply voltage supervision with 50mV hysteresis and 1.6s watchdog timeout for control loop monitoring.

Use Value: Eliminates need for discrete RC reset circuits and external watchdog ICs, improving long-term reliability and reducing board footprint.

Battery-Powered IoT Gateway

Wireless Baseband Processor Reset

Use Scenario: Managing power-up sequencing and runtime supervision in LTE-M/NB-IoT gateways with intermittent power sources.

IC Role / Device Role / Timing Role: Delivers 200ms reset hold time after VDD stabilizes and monitors WDI for host processor liveliness during deep-sleep wake cycles.

Use Value: Enables ultra-low-power operation (15μA) while maintaining fail-safe reset capability across sleep/wake transitions.

Use Scenario: Coordinating reset timing between baseband processors and RF transceivers in 5G small-cell equipment.

IC Role / Device Role / Timing Role: Generates synchronized active-low RESET pulses with precise 200ms duration and validates processor responsiveness via WDI.

Use Value: Avoids race conditions during power-up and ensures transceiver initialization completes only after baseband is fully ready.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS3823A-33DBVT	Extended temperature range (−40°C to 125°C); identical electrical specs except V_IT− min = 2.83V vs 2.86V	Required for automotive under-hood or high-ambient industrial environments	Select when operating ambient exceeds 85°C; otherwise TPS3823-33DBVT suffices
TPS3820-33DBVT	25ms reset delay (vs 200ms); no watchdog timer; same 3.3V threshold and SOT-23-5 package	Suitable for fast-boot systems where minimal reset hold time is critical and watchdog functionality is unnecessary	Choose when shorter reset assertion is needed and watchdog monitoring is handled elsewhere

Compared with TPS3823A-33DBVT, the TPS3823-33DBVT offers lower cost and sufficient thermal margin for most industrial applications, while TPS3820-33DBVT trades watchdog capability for faster reset release-enabling tighter boot timing control where system-level fault recovery is implemented in software.

Availability

TPS3823-33DBVT is available at Aetrix Electronics and suitable for microcontroller power sequencing, industrial PLC supervision, and battery-powered IoT gateway designs requiring stable component supply and long-term manufacturability.

Supply support for TPS3823-33DBVT 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 specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and real-time control solutions.

The TPS382x family was designed specifically for reliable power-on reset generation and runtime watchdog supervision in DSP, microcontroller, and microprocessor systems-emphasizing low quiescent current, fixed-threshold accuracy, and minimal external component count.

FAQ

What is the exact supply voltage threshold for TPS3823-33DBVT?

The TPS3823-33DBVT has a nominal negative-going input threshold voltage (V_IT−) of 2.93V, with a guaranteed range of 2.86V to 3.00V over −40°C to 85°C. This fixed threshold is set by an internal voltage divider and requires no external components, making it ideal for precise 3.3V rail monitoring in the TPS3823-33DBVT application.

Does TPS3823-33DBVT require external components for basic operation?

No, the TPS3823-33DBVT requires no external components for core supervision functionality. Its fixed 3.3V threshold, 200ms reset delay, and 1.6s watchdog timer are all internally generated. A 0.1μF ceramic bypass capacitor near VDD is recommended for noise immunity, but pullup resistors, dividers, or timing capacitors are unnecessary-simplifying design and reducing BOM cost for the TPS3823-33DBVT.

How does the watchdog timer on TPS3823-33DBVT function?

The TPS3823-33DBVT watchdog timer triggers a reset if the WDI pin remains static (high or low) beyond 1.6s (nominal). It resets on each falling edge at WDI, so firmware must toggle WDI periodically. If WDI is left floating, the device generates internal pulses to prevent spurious timeouts. This behavior ensures robust fault detection while accommodating various MCU GPIO configurations in the TPS3823-33DBVT implementation.

What is the role of the MR pin on TPS3823-33DBVT?

The MR (manual reset) pin on TPS3823-33DBVT is an active-low input that forces immediate RESET assertion regardless of VDD level or watchdog state. It features an internal 90kΩ pullup resistor, allowing direct connection to MCU GPIO without external biasing. When pulled low, RESET stays active for the full 200ms delay period even after MR returns high-ensuring deterministic reset behavior in the TPS3823-33DBVT system.

Can TPS3823-33DBVT operate with supply voltages below 3.3V?

Yes, the TPS3823-33DBVT operates from 1.1V to 5.5V and continues to monitor VDD down to 1.1V, but its 3.3V threshold comparison remains valid only when VDD ≥ 1.1V. Below 1.1V, RESET is asserted unconditionally. This wide input range allows use in multi-rail systems and ensures reliable reset assertion during deep brownout conditions in the TPS3823-33DBVT application.

TPS3823-33DBVT Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: SC-74A, SOT-753

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

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-23-5

TPS3823-33DBVT FAQ

1.How can I place an order for TPS3823-33DBVT through Aetrix?

Please submit a Request for Quotation (RFQ) for TPS3823-33DBVT 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 TPS3823-33DBVT reliable?

The price and inventory of TPS3823-33DBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3823-33DBVT is usually 5 days.

3.What payment methods are accepted for TPS3823-33DBVT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3823-33DBVT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TPS3823-33DBVT?

TPS3823-33DBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TPS3823-33DBVT 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 TPS3823-33DBVT?

For technical support, including TPS3823-33DBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3823-33DBVT requirements.

6.How does Aetrix verify that TPS3823-33DBVT is sourced from the original manufacturer or authorized distributors?

All TPS3823-33DBVT 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 TPS3823-33DBVT meets industry standards.

7.What is the process for return or replacement of TPS3823-33DBVT?

All TPS3823-33DBVT units undergo pre-shipment inspection (PSI). If there is an issue with TPS3823-33DBVT, 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 TPS3823-33DBVT part is unused and in its original packaging.

Return procedure for TPS3823-33DBVT:

1.Submit a request within 90 days.

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

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