STMicroelectronics TS831-4IDT

Overview

TS831-4IDT from STMicroelectronics is a micropower voltage supervisor IC with active-low open-drain reset output, designed for power-on reset and brown-out detection in microcontroller systems. It features a precision 4.50 V (typ.) threshold voltage, guaranteed operation down to 1 V supply, ultra-low 12 µA supply current, and 20 µs response time with 10 mV overdrive - deployed in industrial embedded controllers requiring reliable low-voltage supervision.

For engineers reviewing the TS831-4IDT datasheet, TS831-4IDT pinout, TS831-4IDT application, or TS831-4IDT equivalent, this page delivers verified electrical parameters, package-specific terminal roles, thermal performance limits, and real-world reset timing behavior under varying V_CC and temperature conditions - critical for fail-safe system initialization and power-failure recovery design.

Technical Context

The TS831-4IDT integrates a thermally matched band-gap reference and comparator with built-in 100 mV hysteresis, ensuring noise-immune reset assertion during supply ramp-up and decay. Its open-drain output requires an external pull-up resistor and activates when V_CC falls below the 4.50 V threshold (V_THD = 4.40–4.66 V over –40°C to +125°C).

It operates across 1–5.5 V supply range and maintains stable 12 µA ICC at 5 V, with VOL ≤ 1.3 V at 8 mA sink load and IOH ≤ 1 µA at 5 V - enabling direct interface with 3.3 V and 5 V logic families while minimizing standby power in battery-backed systems.

Key Specifications

Pinout & Package

TS831-4IDT 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. Thermal resistance R_thJA = 175°C/W enables operation up to 125°C ambient with minimal derating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC33064DR2G and TPS3808G33DBVR, TS831-4IDT uniquely combines 1 V operational floor, 12 µA current, and fixed 4.50 V threshold in a pin-compatible SO8 package - making it optimal for cost-sensitive, space-constrained, and ultra-low-power reset applications where simplicity and guaranteed low-voltage behavior are essential.

Availability

TS831-4IDT is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, smart meter backup systems, and portable medical devices requiring stable component supply with long-term lifecycle assurance.

Supply support for TS831-4IDT 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 power management, microcontrollers, analog ICs, and automotive-grade components.

The TS831 series belongs to ST's micropower supervisor product line, engineered specifically for robust, low-cost, single-supply reset generation in safety-critical and battery-sensitive applications - emphasizing precision threshold stability and extended temperature reliability.

FAQ

What is the minimum supply voltage at which TS831-4IDT guarantees reset assertion?

TS831-4IDT guarantees valid reset operation down to 1 V supply voltage, as confirmed in the Absolute Maximum Ratings and Operating Conditions tables. This enables reliable brown-out detection even during severe undervoltage events, such as capacitor discharge or battery depletion, where other supervisors may cease functioning.

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

Yes - the OUT pin is open-drain and requires an external pull-up resistor to the target logic voltage (e.g., 3.3 V or 5 V). Recommended values range from 4.7 kΩ to 10 kΩ, selected based on sink current (≤8 mA) and acceptable VOL (≤1.3 V) per the "Voltage output low vs Isink" curves in the datasheet.

How does the 100 mV hysteresis improve system reliability?

The 100 mV internal hysteresis raises the release threshold to ~4.60 V after reset assertion, preventing rapid on/off toggling during supply fluctuations near the 4.50 V trip point. This eliminates false resets caused by ripple, noise, or slow-rising V_CC, especially critical in noisy automotive or industrial power rails.

Can TS831-4IDT replace MC33064 in existing designs without layout changes?

Yes - TS831-4IDT is explicitly specified as pin-to-pin compatible with MC33064 and MC33164 in the SO8 package. No PCB modification is needed; however, verify that the 4.50 V threshold and 12 µA current meet system requirements, as MC33064 uses a different reference architecture and higher quiescent current.