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

Texas Instruments TPS3838K33DBVT

Name: TPS3838K33DBVT
Brand: Texas Instruments
SKU: TPS3838K33DBVT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TPS3838K33DBVT

Manufacturer:: Texas Instruments

Category:: Supervisors

Package:: SC-74A, SOT-753

Datasheet:: TPS3838K33DBVT.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23-5

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Product details

Overview

TPS3838K33DBVT from Texas Instruments is a nano-power voltage supervisor IC with open-drain active-low RESET output, 2.93 V threshold voltage (V_IT), 220 nA typical supply current, and selectable 10 ms or 200 ms reset delay via CT pin - used for undervoltage monitoring in lithium-ion battery-powered MSP430 microcontroller systems.

For engineers reviewing the TPS3838K33DBVT datasheet, TPS3838K33DBVT pinout, TPS3838K33DBVT application, or TPS3838K33DBVT equivalent, this page delivers verified specifications, package mapping to SOT-23-5, functional pin definitions, real-world use cases with timing constraints, and two validated alternative parts with documented technical and application differences.

Technical Context

The TPS3838K33DBVT implements a precision bandgap-based voltage comparator with 40 mV hysteresis (V_HYS) to prevent oscillation near threshold, coupled with an internal timer that initiates after V_DD exceeds V_IT + V_HYS. Its CT pin selects between 10 ms (CT = GND) and 200 ms (CT = V_DD) delay before RESET deassertion.

It features manual reset (MR) with 0.3 µs propagation delay, operates across –40°C to 85°C, and supports supply voltages from 1.6 V to 6 V. The open-drain RESET output requires an external pullup resistor per TI's recommended operating conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply voltage range	1.6 V to 6 V - supports direct monitoring of Li-ion (3.6 V nominal) and wide-input industrial rails.
Threshold voltage (V_IT)	2.93 V (typical) - precisely matches 3.3 V system undervoltage detection at ~10% dropout.
Supply current (I_DD)	220 nA (typical) at V_DD > V_IT, < 3 V - enables multi-year battery life in always-on monitoring.
Reset delay options	10 ms (CT = GND) or 200 ms (CT = V_DD) - configurable debouncing for noisy power rails or slow-rising supplies.
Output type	Active-low open-drain - requires external pullup; isolates RESET logic level from V_DD domain.
Hysteresis (V_HYS)	40 mV (for V_IT > 2.5 V) - prevents chatter during slow V_DD recovery near threshold.
Propagation delay (t_PHL)	10 µs (max) - ensures fast fault response to sudden V_DD collapse below V_IT.

Pinout & Package

TPS3838K33DBVT is packaged in a 5-pin SOT-23 (DBV) with 2.90 mm × 1.60 mm body size, surface-mount footprint, and moisture sensitivity level (MSL) 1 (260°C peak reflow).

Pin/Terminal	Circuit Role	Design Meaning
VDD	Power input and monitored supply rail	Input voltage sensed by internal comparator; must be ≥1.6 V for operation; absolute max 7 V.
GND	Reference ground	Analog and digital return path; decoupling capacitor (0.1 µF ceramic) required near VDD–GND.
CT	Delay configuration control	Connect to GND for 10 ms delay or to VDD for 200 ms delay; no external capacitor needed.
MR	Active-low manual reset input	Pull low to force RESET assertion; internally pulled up to ~30 kΩ; tie to VDD if unused.
RESET	Active-low open-drain output	Drives low on fault; requires external pullup resistor (value specified in Recommended Operating Conditions).

Key Features

Feature	Design Value
Nano-power operation	220 nA typical I_DD enables >10-year battery life in coin-cell or Li-ion backup applications.
Configurable reset timing	Hardware-selectable 10 ms / 200 ms delay eliminates need for external RC timing components.
Open-drain RESET output	Allows wired-OR connection with other supervisors and independent logic-level translation via pullup.
40 mV hysteresis	Guarantees clean, chatter-free reset release during marginal V_DD recovery without external feedback.
–40°C to 85°C operation	Validated performance across industrial temperature range without derating or calibration.

Applications

Portable Medical Sensors	MSP430-Based Data Loggers
Use Scenario: Continuous monitoring of 3.6 V Li-ion battery in wearable ECG sensor with sleep-mode wake-up. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET to halt MCU execution when battery drops below 2.93 V, then holding reset for 200 ms after recovery to prevent brownout restart loops. Use Value: Prevents corrupted memory writes and firmware crashes during transient battery sag, extending usable runtime by eliminating spurious resets.	Use Scenario: Long-term environmental data collection using MSP430FR5969 with intermittent RF transmission. IC Role / Device Role / Timing Role: Monitors main supply and triggers hardware reset if voltage falls below 2.93 V; MR pin tied to pushbutton for field service recovery. Use Value: Ensures deterministic boot state after power interruption, eliminating need for software-based watchdog recovery and reducing firmware complexity.
Smart Meter Battery Backup	Industrial IoT Edge Node
Use Scenario: Supervision of supercapacitor-backed RTC and nonvolatile memory in electricity meter during AC mains failure. IC Role / Device Role / Timing Role: Detects decay of 3.3 V backup rail; asserts open-drain RESET to isolate sensitive analog circuitry and initiate safe shutdown sequence. Use Value: Enables reliable last-gasp data save before power loss, meeting IEC 62056 compliance for metering accuracy retention.	Use Scenario: Power sequencing and fault monitoring in battery-powered vibration sensor node with LoRaWAN radio. IC Role / Device Role / Timing Role: Provides primary undervoltage lockout (UVLO) for system enable; CT pin hardwired to VDD for 200 ms delay to accommodate slow LDO startup. Use Value: Eliminates external timing capacitors and reduces BOM count while maintaining robust power-on reset timing across temperature.

Portable Medical Sensors

MSP430-Based Data Loggers

Use Scenario: Continuous monitoring of 3.6 V Li-ion battery in wearable ECG sensor with sleep-mode wake-up.

IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET to halt MCU execution when battery drops below 2.93 V, then holding reset for 200 ms after recovery to prevent brownout restart loops.

Use Value: Prevents corrupted memory writes and firmware crashes during transient battery sag, extending usable runtime by eliminating spurious resets.

Use Scenario: Long-term environmental data collection using MSP430FR5969 with intermittent RF transmission.

IC Role / Device Role / Timing Role: Monitors main supply and triggers hardware reset if voltage falls below 2.93 V; MR pin tied to pushbutton for field service recovery.

Use Value: Ensures deterministic boot state after power interruption, eliminating need for software-based watchdog recovery and reducing firmware complexity.

Smart Meter Battery Backup

Industrial IoT Edge Node

Use Scenario: Supervision of supercapacitor-backed RTC and nonvolatile memory in electricity meter during AC mains failure.

IC Role / Device Role / Timing Role: Detects decay of 3.3 V backup rail; asserts open-drain RESET to isolate sensitive analog circuitry and initiate safe shutdown sequence.

Use Value: Enables reliable last-gasp data save before power loss, meeting IEC 62056 compliance for metering accuracy retention.

Use Scenario: Power sequencing and fault monitoring in battery-powered vibration sensor node with LoRaWAN radio.

IC Role / Device Role / Timing Role: Provides primary undervoltage lockout (UVLO) for system enable; CT pin hardwired to VDD for 200 ms delay to accommodate slow LDO startup.

Use Value: Eliminates external timing capacitors and reduces BOM count while maintaining robust power-on reset timing across temperature.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS3836K33DBVT	Push-pull active-low RESET; no external pullup required; same V_IT (2.93 V), same package.	Direct replacement where board layout lacks pullup resistor; preferred for space-constrained designs.	Select when minimizing external components and simplifying layout is critical; verify RESET load compatibility with push-pull drive strength.
TPS3838K33DRV	Identical electrical specs but in 2-mm × 2-mm WSON-6 package; includes N/C pin; CT function identical.	Used where thermal performance or PCB area efficiency favors smaller footprint; requires different land pattern.	Choose for higher power density or improved thermal resistance (R_θJA = 84.7°C/W vs. 153.6°C/W for DBV); validate solder reflow profile for WSON.

Compared with TPS3838K33DBVT, TPS3836K33DBVT removes the need for a pullup resistor but cannot share RESET bus with other open-drain devices, while TPS3838K33DRV offers lower thermal resistance and smaller footprint at the cost of revised PCB layout and assembly process validation.

Availability

TPS3838K33DBVT is available at Aetrix Electronics and suitable for portable medical sensors, MSP430-based data loggers, smart meter battery backup systems requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for TPS3838K33DBVT 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 delivering analog and embedded processing solutions, with leadership in low-power design and precision analog IP.

The TPS383x family was designed specifically for ultra-low-power voltage supervision in battery-critical applications such as MSP430 microcontroller systems, featuring nanoamp quiescent current and hardware-configurable timing.

FAQ

What is the exact reset threshold voltage of the TPS3838K33DBVT?

The TPS3838K33DBVT has a nominal threshold voltage (V_IT) of 2.93 V, with a guaranteed range of 2.84 V to 2.99 V over –40°C to 85°C. This value is factory-trimmed and specified in the Electrical Characteristics table of the SLVS292F datasheet under "TPS383xK33" row. It is not user-adjustable and applies directly to the VDD pin.

Does the TPS3838K33DBVT require an external pullup resistor on the RESET pin?

Yes, the TPS3838K33DBVT requires an external pullup resistor on the RESET pin because it features an open-drain output. TI specifies a recommended pullup resistor value in the "Recommended Operating Conditions" table - typically selected based on bus capacitance and rise-time requirements. Failure to include it will result in undefined RESET logic levels.

How is the reset delay time selected on the TPS3838K33DBVT?

The reset delay time on the TPS3838K33DBVT is selected via the CT pin: connect CT to GND for a typical 10 ms delay, or connect CT to VDD for a typical 200 ms delay. No external capacitor is needed. This selection determines how long RESET remains asserted after VDD rises above V_IT + V_HYS, providing hardware-based timing flexibility.

Can the TPS3838K33DBVT operate from a 1.8 V supply?

No - the TPS3838K33DBVT is configured for 3.3 V nominal systems and has a fixed 2.93 V threshold. While its supply voltage range extends down to 1.6 V, operation at 1.8 V would cause the device to assert RESET continuously since VDD (1.8 V) remains below V_IT (2.93 V). For 1.8 V systems, use TPS3838E18DBVT instead.

What is the maximum allowable voltage on the VDD pin of the TPS3838K33DBVT?

The absolute maximum rating for the VDD pin of the TPS3838K33DBVT is 7 V, as stated in Section 7.1 "Absolute Maximum Ratings" of the SLVS292F datasheet. Exceeding this voltage - even momentarily - may cause permanent damage. TI recommends limiting transients with clamping or filtering, especially in automotive or industrial environments.

TPS3838K33DBVT Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

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

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:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: 10ms Minimum

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-5

TPS3838K33DBVT FAQ

1.How can I place an order for TPS3838K33DBVT through Aetrix?

Please submit a Request for Quotation (RFQ) for TPS3838K33DBVT 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 TPS3838K33DBVT reliable?

The price and inventory of TPS3838K33DBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3838K33DBVT is usually 5 days.

3.What payment methods are accepted for TPS3838K33DBVT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3838K33DBVT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TPS3838K33DBVT?

TPS3838K33DBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TPS3838K33DBVT 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 TPS3838K33DBVT?

For technical support, including TPS3838K33DBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3838K33DBVT requirements.

6.How does Aetrix verify that TPS3838K33DBVT is sourced from the original manufacturer or authorized distributors?

All TPS3838K33DBVT 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 TPS3838K33DBVT meets industry standards.

7.What is the process for return or replacement of TPS3838K33DBVT?

All TPS3838K33DBVT units undergo pre-shipment inspection (PSI). If there is an issue with TPS3838K33DBVT, 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 TPS3838K33DBVT part is unused and in its original packaging.

Return procedure for TPS3838K33DBVT:

1.Submit a request within 90 days.

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

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