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

Texas Instruments TPS3124J18DBVT

Name: TPS3124J18DBVT
Brand: Texas Instruments
SKU: TPS3124J18DBVT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TPS3124J18DBVT

Manufacturer:: Texas Instruments

Category:: Supervisors

Package:: SC-74A, SOT-753

Datasheet:: TPS3124J18DBVT.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23-5

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Product details

Overview

TPS3124J18DBVT from Texas Instruments is an ultra-low-voltage processor supervisory IC with 1.62 V nominal reset threshold (V_IT–), 180 ms power-on reset delay, active-high push-pull RESET output, and integrated watchdog timer. It monitors 1.8 V supply rails in DSP and microprocessor systems, asserts RESET when V_DD drops below threshold, and re-triggers on WDI edge transitions to detect software hangs. Designed for battery-powered and always-on infrastructure.

For engineers reviewing the TPS3124J18DBVT datasheet, TPS3124J18DBVT pinout, TPS3124J18DBVT application, or TPS3124J18DBVT equivalent, key selection criteria include its 1.62 V threshold accuracy (±60 mV), 14 µA typical supply current at 0.9 V, watchdog timeout of 0.8–2.1 s, SOT-23-5 package compatibility, and absence of manual reset (MR) input - distinguishing it from TPS3123/3125 variants.

Technical Context

The TPS3124J18DBVT implements a fixed-threshold voltage supervisor with internal hysteresis (20 mV for 1.62 V threshold) and a watchdog timer that resets on rising or falling edges at WDI. Its active-high RESET output remains asserted low until V_DD exceeds V_IT+ = V_IT– + V_HYS, then holds high for 100–260 ms before deassertion.

Unlike TPS3123/3125 devices, it omits the MR pin and instead provides push-pull active-high RESET - enabling direct interface with enable inputs requiring high-level assertion during fault conditions. The watchdog timeout (t_tout) is factory-set and non-adjustable, with no external timing components required.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold (V_IT–)	1.62 V (nominal), ±60 mV tolerance - precisely matches 1.8 V rail monitoring with margin for ripple and drift.
Reset Delay Time (t_d)	180 ms (nominal), 100–260 ms range - ensures stable power-up sequencing for DSPs and MCUs before release.
Watchdog Timeout (t_tout)	0.8–2.1 s - detects firmware stalls in real-time embedded systems without external RC timing.
Supply Current (I_DD)	14 µA (typical at 0.9 V) - enables multi-year operation in coin-cell–powered IoT sensors and portable devices.
Operating Temperature	–40°C to +85°C - qualified for industrial automation, building controls, and telecom infrastructure environments.
Output Type	Active-high push-pull - drives logic-enable inputs directly without pull-up resistors or level-shifting.
Minimum Supply Voltage	0.9 V - supports brownout detection down to ultra-low-power sleep states in modern processors.

Pinout & Package

SOT-23-5 package (2.90 mm × 1.60 mm body), surface-mount, RoHS-compliant, MSL Level-1.

Pin/Terminal	Circuit Role	Design Meaning
1	RESET	Active-high push-pull output - asserts high during V_DD undervoltage or watchdog timeout; sinks/source up to ±5 mA.
2	GND	Ground reference - must be connected to system ground plane with low-inductance path for noise immunity.
3	WDI	Watchdog input - requires periodic rising/falling edge (min. 0.1 µs pulse width) to prevent reset assertion.
4	VDD	Supply input - accepts 0.9–3.3 V; requires 0.1 µF ceramic bypass capacitor placed adjacent to pin.
5	No Connect	Unused terminal - left floating per TI design; no internal connection or function.

Key Features

Feature	Design Value
Fixed 1.62 V threshold	Eliminates external resistor divider; maintains ±60 mV accuracy over –40°C to +85°C for reliable 1.8 V rail supervision.
180 ms reset delay	Guarantees clean power-rail stabilization before releasing processor reset, preventing boot failures in low-noise systems.
Integrated watchdog timer	Detects software lockups via WDI edge detection - no external oscillator or timing capacitor needed.
Active-high push-pull RESET	Directly interfaces with EN pins on PMICs or regulators requiring high-level enable; removes need for external pull-ups.
Ultra-low 14 µA supply current	Extends battery life in always-on monitoring applications such as smart meters and remote sensors.

Applications

Industrial PLC Control	Wireless Sensor Node
Use Scenario: Supervises 1.8 V core supply of ARM Cortex-M4-based programmable logic controller during cold start and brownout events. IC Role / Device Role / Timing Role: Voltage monitor and watchdog - asserts active-high RESET to hold MCU in reset until rail stabilizes and firmware initializes watchdog. Use Value: Prevents erratic I/O behavior during unstable power; watchdog recovery eliminates manual intervention after firmware hang.	Use Scenario: Monitors 1.8 V LDO output powering BLE SoC in battery-operated environmental sensor deployed for 5+ years. IC Role / Device Role / Timing Role: Low-power supervisor - uses 14 µA quiescent current and 0.9 V minimum operation to extend shelf life; WDI tied to SoC GPIO. Use Value: Enables autonomous recovery from firmware crashes without host intervention, preserving data integrity and transmission schedule.
Factory Automation Gateway	Edge AI Inference Module
Use Scenario: Ensures reliable boot of dual-core RISC-V SoC in time-sensitive industrial gateway handling EtherCAT and OPC UA traffic. IC Role / Device Role / Timing Role: Power-on reset generator with 180 ms delay - synchronizes SoC release with FPGA configuration completion and PHY lock. Use Value: Eliminates race conditions between subsystems; active-high RESET aligns with SoC's native reset polarity.	Use Scenario: Supervises 1.8 V AI accelerator supply in thermal-constrained edge inference module operating at 85°C ambient. IC Role / Device Role / Timing Role: High-temperature-stable supervisor - maintains 1.62 V threshold accuracy and 20 mV hysteresis across full –40°C to +85°C range. Use Value: Prevents false resets due to thermal drift; push-pull output drives accelerator enable without signal degradation.

Industrial PLC Control

Wireless Sensor Node

Use Scenario: Supervises 1.8 V core supply of ARM Cortex-M4-based programmable logic controller during cold start and brownout events.

IC Role / Device Role / Timing Role: Voltage monitor and watchdog - asserts active-high RESET to hold MCU in reset until rail stabilizes and firmware initializes watchdog.

Use Value: Prevents erratic I/O behavior during unstable power; watchdog recovery eliminates manual intervention after firmware hang.

Use Scenario: Monitors 1.8 V LDO output powering BLE SoC in battery-operated environmental sensor deployed for 5+ years.

IC Role / Device Role / Timing Role: Low-power supervisor - uses 14 µA quiescent current and 0.9 V minimum operation to extend shelf life; WDI tied to SoC GPIO.

Use Value: Enables autonomous recovery from firmware crashes without host intervention, preserving data integrity and transmission schedule.

Factory Automation Gateway

Edge AI Inference Module

Use Scenario: Ensures reliable boot of dual-core RISC-V SoC in time-sensitive industrial gateway handling EtherCAT and OPC UA traffic.

IC Role / Device Role / Timing Role: Power-on reset generator with 180 ms delay - synchronizes SoC release with FPGA configuration completion and PHY lock.

Use Value: Eliminates race conditions between subsystems; active-high RESET aligns with SoC's native reset polarity.

Use Scenario: Supervises 1.8 V AI accelerator supply in thermal-constrained edge inference module operating at 85°C ambient.

IC Role / Device Role / Timing Role: High-temperature-stable supervisor - maintains 1.62 V threshold accuracy and 20 mV hysteresis across full –40°C to +85°C range.

Use Value: Prevents false resets due to thermal drift; push-pull output drives accelerator enable without signal degradation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS3124J18DBVR	Same electrical specs and pinout; tape-and-reel (3000 pcs) vs. cut-tape (250 pcs); active production status.	Preferred for volume manufacturing; identical functionality with guaranteed long-term availability.	Select TPS3124J18DBVR for production ramp; TPS3124J18DBVT is obsolete but may be available in limited legacy stock.
TPS3808G18DBVR	Higher 1.8 V threshold (1.78 V typ.), 200 ms delay, 2.5 µA I_DD, no watchdog; open-drain active-low output.	Better suited for simple power-good indication without firmware monitoring; lower current draw but lacks WDI capability.	Choose TPS3808G18DBVR only if watchdog is unnecessary and ultra-low quiescent current is critical; not functionally equivalent due to missing WDI and different reset polarity.

Compared with TPS3124J18DBVT, TPS3124J18DBVR offers identical supervision performance with assured supply continuity, while TPS3808G18DBVR trades watchdog functionality and active-high output for lower power and simpler implementation - making it suitable only for non-watchdog applications where reset polarity and feature set align.

Availability

TPS3124J18DBVT is available at Aetrix Electronics and suitable for industrial automation, wireless sensor networks, and edge AI modules requiring stable component supply with precise 1.8 V rail monitoring and watchdog protection.

Supply support for TPS3124J18DBVT 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 over 90 years of innovation in power management, signal chain, and control technologies.

The TPS312x family targets ultra-low-voltage processor supervision in space-constrained, battery-sensitive systems - emphasizing minimal external components, sub-1V operation, and integrated watchdog functionality for robust firmware recovery.

FAQ

What is the exact reset threshold voltage of the TPS3124J18DBVT?

The TPS3124J18DBVT has a nominal negative-going input threshold voltage (V_IT–) of 1.62 V, with a guaranteed range of 1.56 V to 1.68 V across –40°C to +85°C. This value is factory-programmed and applies specifically to the "J18" variant, matching 1.8 V supply rails with appropriate margin for tolerance and temperature drift. The TPS3124J18DBVT does not require external resistors to set this threshold.

Does the TPS3124J18DBVT include a manual reset (MR) input?

No, the TPS3124J18DBVT does not include a manual reset (MR) input. Per TI's device comparison and pin function tables, MR is present only on TPS3123/3125/3126/3128 variants. The TPS3124J18DBVT relies solely on V_DD monitoring and WDI-triggered watchdog reset - making it suitable for designs where external reset initiation is unnecessary or handled elsewhere.

What is the watchdog timeout behavior of the TPS3124J18DBVT?

When enabled, the TPS3124J18DBVT watchdog timer triggers RESET if no edge (rising or falling) occurs on the WDI pin within 0.8–2.1 seconds. Each valid edge clears the timer; failure to retrigger causes active-high RESET assertion for the full 100–260 ms delay period. The TPS3124J18DBVT watchdog is fully integrated - no external timing components are required, and timeout is not user-adjustable.

What package type and dimensions does the TPS3124J18DBVT use?

The TPS3124J18DBVT uses the SOT-23-5 (DBV) package with nominal body dimensions of 2.90 mm × 1.60 mm. It is a surface-mount, RoHS-compliant package rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH). Pin 5 is a no-connect terminal, and the device is characterized for operation from –40°C to +85°C - matching industrial-grade thermal requirements.

How does the TPS3124J18DBVT differ from the TPS3123J18DBVT?

The TPS3124J18DBVT differs from the TPS3123J18DBVT in three key ways: (1) it provides active-high push-pull RESET output (TPS3123J18DBVT is active-low), (2) it lacks the MR input pin (TPS3123J18DBVT includes MR), and (3) both share identical 1.62 V threshold and 180 ms delay, but TPS3124J18DBVT's pin 3 is WDI while TPS3123J18DBVT's pin 3 is MR - making them incompatible in pin-for-pin replacement scenarios.

TPS3124J18DBVT 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:: 1.62V

Output:: Push-Pull, Totem Pole

Reset:: Active High/Active Low

Reset Timeout:: 100ms Minimum

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-5

TPS3124J18DBVT FAQ

1.How can I place an order for TPS3124J18DBVT through Aetrix?

Please submit a Request for Quotation (RFQ) for TPS3124J18DBVT 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 TPS3124J18DBVT reliable?

The price and inventory of TPS3124J18DBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3124J18DBVT is usually 5 days.

3.What payment methods are accepted for TPS3124J18DBVT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3124J18DBVT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TPS3124J18DBVT?

TPS3124J18DBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TPS3124J18DBVT 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 TPS3124J18DBVT?

For technical support, including TPS3124J18DBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3124J18DBVT requirements.

6.How does Aetrix verify that TPS3124J18DBVT is sourced from the original manufacturer or authorized distributors?

All TPS3124J18DBVT 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 TPS3124J18DBVT meets industry standards.

7.What is the process for return or replacement of TPS3124J18DBVT?

All TPS3124J18DBVT units undergo pre-shipment inspection (PSI). If there is an issue with TPS3124J18DBVT, 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 TPS3124J18DBVT part is unused and in its original packaging.

Return procedure for TPS3124J18DBVT:

1.Submit a request within 90 days.

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

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