STMicroelectronics TS831-5IPT

Overview

TS831-5IPT from STMicroelectronics is an ultra-low-power voltage supervisor IC with active-low open-drain reset output, precision 4.33V threshold (typ.), 12µA supply current at 5V, guaranteed operation down to 1V V_CC, and 20µs response time under 10mV overdrive - used for power-on reset generation in battery-powered microcontroller systems.

For engineers reviewing the TS831-5IPT datasheet, TS831-5IPT pinout, TS831-5IPT application, or TS831-5IPT equivalent, key selection criteria include reset threshold accuracy over temperature, ultra-low ICC stability across 1–5.5V supply range, open-drain sink capability up to 20mA, and compatibility with MC33064/MC33164-based legacy designs.

Technical Context

The TS831-5IPT integrates a thermally matched band-gap reference and comparator with internal hysteresis (100mV typ.) to reject supply noise and prevent false resets during brown-out conditions. Its open-drain output requires an external pull-up and asserts low when V_CC falls below 4.33V (rising threshold) or rises above 4.46V (falling threshold).

It operates across –40°C to +125°C with guaranteed reset assertion down to 1V V_CC, enabling use in deep-sleep MCU applications where supply rails collapse partially before full shutdown. The 20µs propagation delay is measured with RL = 10kΩ and CL = 15pF under 10mV overdrive.

Key Specifications

Pinout & Package

TSSOP8 (Thin Shrink Small Outline Package), 8-pin, lead-free, RoHS-compliant, tape-and-reel packaging (PT suffix). Pin 1 marked by dot or bevelled corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809SEUR+T and TPS3808G33DBVR, TS831-5IPT uniquely balances 4.33V precision, 100mV hysteresis, 12µA ICC, and MC33064 compatibility - making it optimal for drop-in upgrades in industrial and automotive reset circuits requiring robust noise immunity without added components.

Availability

TS831-5IPT is available at Aetrix Electronics and suitable for industrial PLCs, medical wearables, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TS831-5IPT 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The TS831 series belongs to ST's precision voltage supervisor product line, engineered specifically for high-reliability reset generation in systems where supply stability, low power, and wide temperature operation are critical design constraints.

FAQ

What is the minimum V_CC required for TS831-5IPT to assert reset?

The TS831-5IPT guarantees reset assertion down to 1V V_CC, meaning it will pull its open-drain output low even when supply voltage collapses to 1V. This behavior is validated across –40°C to +125°C and enables safe MCU shutdown during deep brown-out conditions before memory corruption occurs.

Does TS831-5IPT require an external pull-up resistor on the OUT pin?

Yes - the OUT pin is open-drain and must be pulled up to a logic-compatible voltage (e.g., 3.3V or 5V) via an external resistor. Typical values range from 10kΩ to 100kΩ depending on rise-time requirements and bus capacitance; ST recommends referencing the "Voltage output low vs Isink" curves in the datasheet for precise sizing.

How does the 100mV hysteresis improve system reliability?

The 100mV hysteresis creates a 4.33V turn-on threshold and ~4.43V turn-off threshold, preventing rapid toggling of the reset signal during slow or noisy supply recovery. This eliminates false resets caused by ripple, EMI, or marginal power supply regulation - especially critical in motor-driven or switching-converter environments.

Is TS831-5IPT pin-compatible with MC33064 in TSSOP8 footprint?

No - MC33064 is only available in SO-8 and TO-92 packages, not TSSOP8. However, TS831-5IPT matches MC33064's pinout in SO-8 (D suffix) and TO-92 (Z suffix); the TSSOP8 (P suffix) variant maintains identical signal mapping but requires PCB footprint adaptation due to smaller pitch and body size.