Texas Instruments TPS3124G15DBVR

Overview

TPS3124G15DBVR from Texas Instruments is an ultra-low-voltage processor supervisory IC with 1.40 V nominal reset threshold, active-high push-pull RESET output, integrated watchdog timer, and 180 ms power-on reset delay. It monitors supply rails down to 0.9 V and asserts reset during brownout or software hang in DSP- and microcontroller-based systems. Designed for battery-powered industrial automation and communications infrastructure.

For engineers reviewing the TPS3124G15DBVR datasheet, TPS3124G15DBVR pinout, TPS3124G15DBVR application, or TPS3124G15DBVR equivalent, key selection criteria include its fixed 1.40 V threshold (±5% tolerance), 14 µA typical supply current at 0.9 V, watchdog timeout of 1.4 s (typ), absence of manual reset input, and SOT-23-5 package compatibility with space-constrained embedded designs.

Technical Context

The TPS3124G15DBVR implements a precision voltage comparator with internal hysteresis (20 mV) to prevent false triggering near threshold, coupled with a monostable watchdog timer that resets on missing WDI edge transitions. Its active-high RESET output remains asserted for 180 ms after VDD rises above VIT+ = VIT− + VHYS.

Unlike TPS3123/3125 variants, this device omits the MR pin but retains WDI functionality and uses a push-pull output stage-enabling direct interface with logic inputs without external pull-up resistors. It operates across −40°C to +85°C with guaranteed reset validity only when VDD ≥ 0.9 V.

Key Specifications

Pinout & Package

SOT-23-5 package (2.90 mm × 1.60 mm body size), surface-mount, RoHS-compliant, moisture sensitivity level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3124G15DBVR, TPS3124J12DBVR shifts threshold downward for lower-voltage rails, while TPS3125G15DBVR adds MR and changes output topology-neither is pin-compatible nor drop-in; both require schematic and layout review for integration.

Availability

TPS3124G15DBVR is available at Aetrix Electronics and suitable for industrial automation, wireless infrastructure, and portable medical devices requiring stable component supply throughout product lifecycles.

Supply support for TPS3124G15DBVR 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 for industrial, automotive, and personal electronics markets.

The TPS312x family was designed specifically for ultra-low-voltage supervision in DSP and microcontroller systems, integrating precise threshold detection, watchdog timing, and flexible reset output topologies into compact SOT-23 packages.

FAQ

What is the exact reset threshold voltage of the TPS3124G15DBVR?

The TPS3124G15DBVR has a nominal reset threshold voltage of 1.40 V, with a guaranteed range of 1.35 V to 1.45 V over −40°C to +85°C. This value is factory-trimmed and does not require external calibration. The 'G' in the part number denotes a −7% deviation from the nominal 1.5 V supply rail, resulting in the 1.40 V trip point. The TPS3124G15DBVR uses internal hysteresis of 20 mV to prevent chatter near threshold.

Does the TPS3124G15DBVR include a manual reset (MR) input?

No, the TPS3124G15DBVR does not include a manual reset (MR) input. Unlike TPS3123/3125/3126 variants, this device omits the MR pin to simplify the interface and reduce pin count. Reset assertion is triggered solely by supply voltage falling below VIT− or by watchdog timeout on the WDI pin. The TPS3124G15DBVR relies exclusively on VDD monitoring and WDI supervision-no external hardware reset initiation is supported.

What is the watchdog timeout period for the TPS3124G15DBVR?

The watchdog timeout period for the TPS3124G15DBVR is 1.4 s (nominal), with a guaranteed range of 0.8 s to 2.1 s over temperature and voltage. A rising or falling edge on the WDI pin resets the timer; failure to provide such an edge within the timeout window causes the active-high RESET output to assert for the full 180 ms delay period. This behavior is confirmed in Section 6.7 of the official datasheet and applies identically across all TPS3124-x variants.

What package type and footprint does the TPS3124G15DBVR use?

The TPS3124G15DBVR uses a 5-pin SOT-23 (DBV) package with nominal dimensions of 2.90 mm × 1.60 mm. It is surface-mount compatible, RoHS-compliant, and rated for moisture sensitivity level 1 (MSL-1) with peak reflow temperature of 260°C. Pin 1 is RESET (active-high), Pin 2 is GND, Pin 3 is duplicate RESET, Pin 4 is WDI, and Pin 5 is VDD-matching the standard DBV top-view layout shown in Figure 5-2 of the datasheet.

Can the TPS3124G15DBVR operate from a 0.9 V supply?

Yes, the TPS3124G15DBVR is fully specified to operate from a minimum supply voltage of 0.9 V, with typical supply current of 14 µA at that voltage. However, the RESET output is not valid below 0.9 V, and the internal voltage reference and comparator require VDD ≥ 0.9 V to function correctly. At 0.9 V, the device maintains full supervision functionality-including watchdog timing and threshold detection-but performance parameters like propagation delay may vary slightly from nominal values.