STMicroelectronics TS831-4ID

Overview

TS831-4ID from STMicroelectronics is a micropower voltage supervisor IC with active-low open-drain reset output, designed for power-on reset and power-fail detection in microcontroller systems. It features a precision 4.50 V (typ.) threshold voltage, 100 mV hysteresis, 12 µA supply current at 5 V, guaranteed operation down to 1 V supply, and 20 µs response time under 10 mV overdrive.

For engineers reviewing the TS831-4ID datasheet, TS831-4ID pinout, TS831-4ID application, or TS831-4ID equivalent, this device serves as a low-power, temperature-stable reset supervisor where precise V_TH tolerance, noise immunity via internal hysteresis, and compatibility with MC33064/MC33164 are critical selection criteria.

Technical Context

The TS831-4ID integrates a thermally matched band-gap reference and comparator with built-in hysteresis (100 mV), enabling stable reset assertion across -40°C to +125°C. Its open-drain output requires an external pull-up and asserts low when V_CC falls below the decreasing-threshold V_THD (4.40–4.66 V).

It operates from 1 V to 5.5 V supply, consumes only 12 µA at 5 V, and delivers fast 20 µs propagation delay (TPHL) with 10 mV overdrive into 10 kΩ/15 pF load - making it suitable for battery-powered and space-constrained embedded systems requiring reliable brown-out detection.

Key Specifications

Pinout & Package

TS831-4ID is supplied in an 8-pin SO (Small Outline) plastic micropackage (SO8), compliant with JEDEC MS-012, with 1.27 mm pitch and gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC33064DR2G and TLV803EB29DBZR, TS831-4ID uniquely balances 4.5 V precision threshold, 1 V operational floor, and 12 µA consumption - making it optimal for 5 V microcontroller systems needing robust, low-power reset assurance without redesign.

Availability

TS831-4ID is available at Aetrix Electronics and suitable for microcontroller power-on reset, industrial PLC power monitoring, and automotive body control modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned performance.

Supply support for TS831-4ID 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, specializing in automotive, industrial, and embedded solutions with vertical manufacturing and broad analog/mixed-signal portfolio.

The TS831 series belongs to ST's micropower supervisor product line, engineered specifically for high-reliability reset generation in resource-constrained embedded systems where precision, ultra-low power, and wide temperature operation are mandatory.

FAQ

What is the minimum supply voltage required for TS831-4ID to assert a valid reset?

The TS831-4ID guarantees correct reset assertion down to 1 V supply voltage, as specified in the Absolute Maximum Ratings and Operating Conditions tables. At V_CC = 1 V, the internal band-gap reference remains functional and the comparator maintains defined hysteresis and output behavior - enabling reliable brown-out detection even during severe undervoltage events.

Does TS831-4ID require an external pull-up resistor on the output pin?

Yes - TS831-4ID features an open-drain output (pin 3), which can only sink current. An external pull-up resistor to the target logic rail (e.g., 3.3 V or 5 V) is mandatory to generate a valid high-level reset release signal. The datasheet recommends selecting R_PULLUP based on VOL vs. I_SINK curves to ensure <0.8 V low-state margin across temperature and load.

How does the 100 mV hysteresis improve system reliability?

The 100 mV hysteresis creates a voltage window between V_THI (4.50 V typ.) and V_THD (4.40 V typ.), preventing rapid reset toggling during noisy or slowly decaying V_CC conditions. This eliminates false resets caused by ripple, EMI, or marginal power supply regulation - especially critical in motor-driven or switching-power-supply environments.

Is TS831-4ID pin-compatible with MC33064 in SO-8 packages?

Yes - TS831-4ID uses the same SO-8 (plastic micropackage) footprint and pin assignment (V_IN, GND, OUT, NC×5) as MC33064DR2G. No PCB modification is needed for replacement, though designers should verify that the tighter 4.50 V threshold and lower 12 µA current meet system timing and power constraints.