Texas Instruments TPS3103K33DBVR

Overview

TPS3103K33DBVR from Texas Instruments is an ultralow-supply-current voltage supervisor IC with fixed 3.3V VDD threshold, active-low open-drain RESET output, and integrated power-fail monitoring (PFI/PFO). It asserts reset when VDD falls below 2.919–2.963V (±0.75% accuracy), operates down to 0.4V VDD for valid reset assertion, draws only 1.2μA typical supply current, and delivers 130ms power-on reset delay - ideal for battery-backed microcontroller systems requiring precise, low-power supply supervision.

For engineers reviewing the TPS3103K33DBVR datasheet, TPS3103K33DBVR pinout, TPS3103K33DBVR application, or TPS3103K33DBVR equivalent, key selection criteria include its 3.3V fixed VDD trip point, open-drain RESET compatibility with I²C bus pull-ups, PFI input referenced to 0.551V for auxiliary rail monitoring, –40°C to 125°C operating range, and SOT-23-6 package footprint for space-constrained portable designs.

Technical Context

The TPS3103K33DBVR implements a precision bandgap-based comparator for VDD supervision and a separate 0.551V reference comparator for the PFI input, both with 15mV hysteresis. Its internal reset timer initiates only after VDD exceeds VIT– + VHYS, ensuring stable release after power ramp-up.

It features a manual reset (MR) input with internal 100kΩ pullup, enabling system-level reset initiation independent of supply conditions. The PFO output is open-drain and unidirectionally driven by the PFI comparator - no interaction with VDD or MR logic states - supporting standalone low-battery warning or secondary supply fault signaling.

Key Specifications

Pinout & Package

TPS3103K33DBVR is housed in a 6-pin SOT-23 (DBV) package measuring 2.90mm × 2.80mm, optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3103K33DBVR, TPS3106K33DBVR adds dedicated SENSE supervision at the cost of losing PFI/PFO functionality, while TLV803EB33DBVR reduces current draw but removes auxiliary monitoring entirely - selection depends on whether power-fail signaling or second-rail tracking is required in the target system.

Availability

TPS3103K33DBVR is available at Aetrix Electronics and suitable for battery-powered instrumentation, automotive body electronics, and industrial PLC modules requiring stable component supply with long-term lifecycle support.

Supply support for TPS3103K33DBVR 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 50 years of innovation in power management, signal chain, and real-time control ICs.

The TPS31xx family was designed specifically for low-power, high-accuracy supply supervision in DSP and microcontroller systems - emphasizing ultralow IDD, precise trip thresholds, and robust operation across automotive and industrial temperature ranges.

FAQ

What is the exact VDD trip threshold voltage for TPS3103K33DBVR?

The TPS3103K33DBVR has a nominal VDD trip threshold (VIT–) of 2.941V at 25°C, with a guaranteed range of 2.919V to 2.963V (±0.75% tolerance). Over the full –40°C to 125°C temperature range, the threshold varies from 2.823V to 3.058V. This fixed 3.3V-compatible threshold is set by an internal precision voltage divider and requires no external components. The TPS3103K33DBVR datasheet specifies these values in Section 6.5 Electrical Characteristics.

Does TPS3103K33DBVR support monitoring a second voltage rail besides VDD?

Yes, the TPS3103K33DBVR supports auxiliary rail monitoring via its PFI (power-fail input) pin, which compares an external voltage to a 0.551V internal reference. When the divided voltage at PFI drops below this threshold, the open-drain PFO output goes low - independent of VDD or RESET state. This enables low-battery detection or secondary supply supervision without affecting the primary 3.3V reset function. The TPS3103K33DBVR PFI input is explicitly characterized for operation with VDD ≥ 0.8V.

What is the minimum VDD voltage at which TPS3103K33DBVR can assert RESET?

The TPS3103K33DBVR can assert a valid RESET signal down to VDD = 0.4V, as confirmed in the Functional Description (Section 3) and Timing Diagrams (Figure 6-1). Below this voltage, the internal circuitry may not operate reliably, but at 0.4V and above, RESET remains well-defined and meets VOL ≤ 0.1V specifications. This capability ensures deterministic reset behavior during deep brownout events - a key differentiator versus supervisors requiring ≥1.0V minimum VDD. The TPS3103K33DBVR maintains this specification across its full temperature range.

Is the MR pin of TPS3103K33DBVR internally pulled up, and what is the resistance value?

Yes, the MR (manual reset) pin of TPS3103K33DBVR features an internal pullup resistor to VDD with a nominal value of 100kΩ, specified between 70kΩ and 130kΩ. This allows the MR pin to be left floating (unconnected) when unused, defaulting to a logic-high inactive state. To initiate a reset, MR must be pulled low externally - for example, using a momentary switch to GND. The internal pullup eliminates the need for an external resistor in most designs, simplifying layout and reducing component count. This characteristic is documented in Section 6.5 Electrical Characteristics of the TPS3103K33DBVR datasheet.

What package type and dimensions does TPS3103K33DBVR use?

TPS3103K33DBVR uses the DBV package - a 6-pin SOT-23 variant measuring 2.90mm in length and 2.80mm in width, including leads. This surface-mount package is RoHS-compliant, compatible with standard reflow soldering processes, and optimized for high-density PCB layouts. Pin 1 is marked by a dot or beveled edge, and the pinout follows the standard TPS3103 configuration: RESET (1), GND (2), MR (3), PFI (4), PFO (5), VDD (6). The DBV package is explicitly listed in TI's Mechanical, Packaging, and Orderable Information section (Section 11) for TPS3103K33DBVR.