Texas Instruments TPS3126E15DBVR

Overview

TPS3126E15DBVR from Texas Instruments is an ultra-low-voltage supervisor IC with active-high push-pull RESET output, 1.43 V nominal reset threshold (V_IT–), 180 ms fixed reset delay (t_d), manual reset (MR) input, and −40°C to +85°C operating range. It monitors 1.5 V rails in battery-powered DSP and microcontroller systems where reliable power-on initialization and fault-triggered recovery are required.

For engineers reviewing the TPS3126E15DBVR datasheet, TPS3126E15DBVR pinout, TPS3126E15DBVR application, or TPS3126E15DBVR equivalent, this page delivers verified specifications, SOT-23-5 terminal mapping, real-world use cases in portable electronics and industrial automation, and two validated alternative parts with documented functional and topological differences.

Technical Context

The TPS3126E15DBVR integrates voltage supervision, manual reset assertion, and fixed-delay timing logic in a single 5-pin SOT-23 package. Its internal voltage divider sets a precise 1.43 V (typ) threshold with 20 mV hysteresis (V_HYS) for stable trip/release behavior across temperature.

This device operates down to 0.9 V supply (V_DD) and delivers an active-high RESET signal with push-pull drive capability-distinct from open-drain variants like TPS3126L30DBVR. It lacks watchdog timer functionality, differentiating it from TPS3123/3124/3128 family members.

Key Specifications

Pinout & Package

TPS3126E15DBVR uses a 5-pin SOT-23 (DBV) package with 2.90 mm × 1.60 mm body size, optimized for space-constrained PCBs in portable and industrial designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3126E15DBVR, TPS3125G15DBVR trades push-pull drive for open-drain flexibility at the cost of added external component, while TPS3124J12DBVR reduces threshold voltage and removes MR-making both alternatives functionally distinct rather than drop-in replacements.

Availability

TPS3126E15DBVR is available at Aetrix Electronics and suitable for portable electronics, industrial sensor nodes, factory automation PLC modules, and medical point-of-care monitors requiring stable component supply with full lifecycle support.

Supply support for TPS3126E15DBVR 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 was designed specifically for ultra-low-voltage supervision in DSP, MCU, and FPGA-based systems-emphasizing minimal quiescent current, precise threshold accuracy, and robust reset timing under brownout conditions.

FAQ

What is the exact reset threshold voltage of TPS3126E15DBVR?

The TPS3126E15DBVR has a nominal reset threshold (V_IT–) of 1.43 V, with guaranteed min/max values of 1.38 V and 1.48 V across –40°C to +85°C. This value is factory-trimmed and fixed-no external resistors are needed to set the threshold, ensuring consistent performance across production lots and temperature ranges. The TPS3126E15DBVR achieves this using an internal precision voltage divider network.

Does TPS3126E15DBVR include a watchdog timer?

No, the TPS3126E15DBVR does not include a watchdog timer. It is a dedicated voltage supervisor with manual reset (MR) input and fixed-delay active-high RESET output. Watchdog functionality is present only in TPS3123/3124/3128 variants-confirmed by the device naming nomenclature ('E' prefix denotes threshold variant, not WDI capability) and absence of WDI pin in the TPS3126 pinout. The TPS3126E15DBVR relies solely on V_DD monitoring and MR for reset initiation.

What is the function of Pin 5 (NC) on TPS3126E15DBVR?

Pin 5 on the TPS3126E15DBVR is designated NC (No Connect) and is internally unconnected. Texas Instruments specifies that this pin must remain floating or be tied to GND-never driven high-to avoid unintended electrical interaction. Unlike TPS3123/3128 devices, the TPS3126E15DBVR does not use Pin 5 for WDI or any other signal; its functional pins are strictly limited to RESET, GND, MR, and VDD as defined in the DBV package pin map.

Can TPS3126E15DBVR operate from a 0.9 V supply?

Yes, the TPS3126E15DBVR is fully specified to operate with supply voltages as low as 0.9 V, with typical supply current of 14 µA at that level. Its internal comparators and reset logic remain functional down to this minimum V_DD, enabling use in ultra-low-power wake-up circuits and battery-discharge monitoring. However, RESET output validity is guaranteed only when V_DD ≥ 0.9 V-the TPS3126E15DBVR does not assert RESET below this voltage.

How does the manual reset (MR) input behave on TPS3126E15DBVR?

On the TPS3126E15DBVR, a logic-low signal applied to the MR pin forces the RESET output high immediately, regardless of V_DD level or threshold crossing status. Once MR is released (pulled high or left floating), RESET remains asserted for the full 180 ms delay period before returning to its inactive (low) state. This behavior is confirmed in the functional mode table and timing diagrams for TPS3125/3126 devices, and the MR pin features an internal 90 kΩ pullup resistor per electrical characteristics.