Texas Instruments TPS3124J12DBVT

Overview

TPS3124J12DBVT from Texas Instruments is an ultra-low-voltage processor supervisory IC with active-high RESET output, 1.08 V nominal reset threshold (±40 mV over –40°C to +85°C), 180 ms fixed power-on reset delay, and integrated watchdog timer. It monitors 1.2 V supply rails in DSP and microprocessor systems and asserts RESET when VDD falls below VIT−, supporting reliable boot sequencing and hang detection in always-on embedded applications.

For engineers reviewing the TPS3124J12DBVT datasheet, TPS3124J12DBVT pinout, TPS3124J12DBVT application, or TPS3124J12DBVT equivalent, this page delivers verified functional identity, confirmed SOT-23-5 pin mapping, exact watchdog timeout (1.4 s typical), supply current (14 µA at 0.9 V), and validated alternative options for 1.2 V rail supervision with active-high reset.

Technical Context

The TPS3124J12DBVT implements a precision voltage comparator with internal resistor divider setting VIT− = 1.08 V (typical), 20 mV hysteresis, and valid operation down to 0.9 V supply. Its watchdog timer triggers RESET if WDI transitions are missed beyond 1.4 s (typical), and the active-high RESET output remains asserted for 180 ms after VDD rises above VIT+.

This device belongs to the TPS312x family optimized for low-power, battery-sensitive systems. Unlike TPS3123/3125/3126 variants, it omits manual reset (MR) input but retains WDI functionality and push-pull active-high RESET - enabling direct interface with enable inputs of PMICs or processors requiring high-valid reset signaling.

Key Specifications

Pinout & Package

TPS3124J12DBVT is housed in a 5-pin SOT-23 (DBV) package, 2.90 mm × 1.60 mm body size, with gull-wing leads suitable for automated PCB assembly and space-constrained layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3124J12DBVT, TPS3124J12DBVR offers identical performance with assured availability, while TPS3823-12DBVR trades watchdog capability and active-high drive for lower cost and broader legacy compatibility - making it viable only in non-hang-critical applications.

Availability

TPS3124J12DBVT is available at Aetrix Electronics and suitable for industrial PLC I/O modules, portable medical sensor nodes, wireless baseband processors, and smart building controllers requiring stable component supply under extended temperature and ultra-low-voltage constraints.

Supply support for TPS3124J12DBVT 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 power management technologies, with decades of expertise in high-reliability supervisory circuits.

The TPS312x product line was designed specifically for ultra-low-voltage, feature-integrated power supervision in DSP, MCU, and SoC-based systems - prioritizing precision threshold accuracy, minimal quiescent current, and robust watchdog functionality.

FAQ

What is the exact reset threshold voltage of the TPS3124J12DBVT?

The TPS3124J12DBVT has a nominal reset threshold voltage (VIT−) of 1.08 V, with guaranteed range of 1.04 V to 1.12 V over –40°C to +85°C. This value is factory-trimmed and applies specifically to the J12 variant, matching the 1.2 V supply rail it is intended to supervise. The TPS3124J12DBVT does not require external resistors to set this threshold.

Does the TPS3124J12DBVT include a manual reset (MR) input?

No, the TPS3124J12DBVT 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 TPS3124J12DBVT substitutes MR omission with dedicated active-high RESET output and retains WDI functionality - distinguishing it from MR-capable family members.

What is the watchdog timeout behavior of the TPS3124J12DBVT?

The TPS3124J12DBVT watchdog timer times out after 1.4 s (typical), with min/max of 0.8 s / 2.1 s. A rising or falling edge on WDI resets the timer; static high or low states trigger RESET assertion after timeout. This behavior is confirmed in Section 6.7 Switching Characteristics and Figure 6-2 timing diagrams specific to TPS3124 devices.

Is the TPS3124J12DBVT pin-compatible with other TPS312x variants?

The TPS3124J12DBVT shares the same 5-pin SOT-23 (DBV) package and pinout as all TPS312x family members, including TPS3123J12DBVT and TPS3125G15DBVR. However, pin functions differ: Pin 3 is RESET (active-high) in TPS3124J12DBVT, whereas it is MR (input) in TPS3123/3125. Direct replacement requires verifying functional alignment - not just physical compatibility.

What is the operating supply current of the TPS3124J12DBVT at 0.9 V?

The TPS3124J12DBVT draws 14 µA (typical) supply current at VDD = 0.9 V, as specified in Section 6.5 Electrical Characteristics. This value is measured with WDI connected to VDD and MR unconnected. Current increases to 22 µA at 3.3 V, confirming its ultra-low-power design for battery-backed or energy-harvesting applications.