Texas Instruments TPS3124G15DBVT

Overview

TPS3124G15DBVT from Texas Instruments is an ultra-low-voltage processor supervisory IC designed for power-on reset and watchdog supervision in low-power DSP/microcontroller systems. It features a 1.40 V reset threshold (V_IT−), 180 ms reset delay (t_d), 14 µA typical supply current, push-pull active-low RESET output, and watchdog timer with 0.8 s timeout (t_tout). It operates across −40°C to 85°C and supports 0.75 V minimum supply voltage.

For engineers reviewing the TPS3124G15DBVT datasheet, TPS3124G15DBVT pinout, TPS3124G15DBVT application, or TPS3124G15DBVT equivalent, key selection considerations include its fixed 1.40 V threshold, absence of manual reset (MR) input, presence of WDI watchdog input, push-pull RESET topology, and SOT-23-5 package compatibility with space-constrained portable and battery-powered designs.

Technical Context

The TPS3124G15DBVT integrates a precision internal voltage divider to set its 1.40 V reset threshold with ±50 mV hysteresis, ensuring stable detection during brownout conditions. Its watchdog circuit requires periodic WDI transitions to prevent RESET assertion, with timeout calibrated at 0.8 s (typical) and no external components needed.

During power-up, RESET remains asserted until V_DD exceeds 0.75 V and then stays active until V_DD rises above 1.40 V; a built-in 180 ms timer ensures clean system initialization. Unlike TPS3123/5/6/8 variants, it omits MR but retains WDI and delivers a push-pull active-low RESET signal compatible with 1.5 V logic domains.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.9 mm × 1.6 mm × 1.15 mm body, surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar processor supervisory applications.

Compared with TPS3124G15DBVT, TPS3124J12DBVT offers earlier reset assertion for 1.2 V rails, while TPS3124J18DBVT delays reset for higher-noise 1.8 V environments-both retain identical watchdog behavior, package, and temperature range, enabling layout reuse with only threshold adjustment.

Availability

TPS3124G15DBVT is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and wireless edge node gateways requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS3124G15DBVT 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 specializing in analog, embedded processing, and digital signal technologies, with decades of expertise in power management and system supervision ICs.

The TPS312x family was engineered specifically for ultralow-voltage supervision of DSPs, microcontrollers, and microprocessors in battery-powered and space-constrained applications-emphasizing minimal quiescent current, precise threshold accuracy, and integrated watchdog functionality.

FAQ

What is the reset threshold voltage of the TPS3124G15DBVT?

The TPS3124G15DBVT has a nominal reset threshold voltage (V_IT−) of 1.40 V, with a guaranteed range of 1.35 V to 1.45 V across −40°C to 85°C. This value is factory-trimmed and applies to the exact part number TPS3124G15DBVT as specified in Table 1 of the SLVS227B datasheet. The 1.40 V threshold is optimized for supervision of 1.5 V supply rails with adequate noise margin.

Does the TPS3124G15DBVT include a manual reset (MR) input?

No, the TPS3124G15DBVT does not include a manual reset (MR) input. As confirmed in the functional description and Figure 1 pinout diagram, TPS3124 devices omit MR but retain WDI and deliver a push-pull RESET output. This distinguishes TPS3124G15DBVT from TPS3123/5/6/8 variants, which feature MR. Pin 5 is NC, and no MR-related functionality is implemented in this variant.

What is the watchdog timeout period for the TPS3124G15DBVT?

The watchdog timeout period (t_tout) for the TPS3124G15DBVT is 0.8 s (typical), with a maximum of 2.1 s across temperature and voltage. This value is explicitly stated in the "Timing Requirements" table of the SLVS227B datasheet and applies to all TPS3123/4/8 devices. The watchdog is retriggered by any edge (rising or falling) on the WDI pin, and failure to retrigger within t_tout forces RESET assertion for 180 ms.

What package type and pin count does the TPS3124G15DBVT use?

The TPS3124G15DBVT uses the DBV package: a 5-pin SOT-23-5 surface-mount package measuring 2.9 mm × 1.6 mm × 1.15 mm. This is confirmed in the "PACKAGE INFORMATION" section and top-view diagrams. Pin assignments are VDD (1), GND (2), RESET (3), WDI (4), and NC (5). The "DBVT" suffix denotes tape-and-reel packaging with 250 units per reel.

Is the RESET output of the TPS3124G15DBVT push-pull or open-drain?

The RESET output of the TPS3124G15DBVT is push-pull active-low, as verified in Table 2 ("Function Tables") and the "Features" list of the SLVS227B datasheet. This means it actively drives both high and low states-no external pull-up resistor is required. The output can sink up to 1.4 mA at V_DD = 1.5 V and provides rail-to-rail switching, distinguishing it from open-drain variants like TPS3123.