STMicroelectronics TS831-5IZ-AP

Overview

TS831-5IZ-AP 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. It serves as a power-on reset generator for microcontrollers in battery-powered industrial sensors.

For engineers reviewing the TS831-5IZ-AP datasheet, TS831-5IZ-AP pinout, TS831-5IZ-AP application, or TS831-5IZ-AP equivalent, key selection criteria include reset threshold accuracy, sub-15µA quiescent current across temperature, open-drain drive capability up to 8mA sink, and compatibility with MC33064/MC33164-based legacy designs.

Technical Context

The TS831-5IZ-AP integrates a thermally matched band-gap reference and comparator with built-in 100mV hysteresis, enabling robust noise immunity during brown-out detection. Its open-drain output requires an external pull-up and asserts low when V_CC falls below 4.33V (typ.) during power-down.

Designed for single-supply operation from 1V to 5.5V, it delivers guaranteed reset assertion across –40°C to +125°C, with V_OL ≤ 1.0V at 8mA sink and I_OH leakage < 1µA - critical for low-voltage microcontroller reset integrity in automotive body control modules.

Key Specifications

Pinout & Package

TS831-5IZ-AP is supplied in TO-92 plastic package (3-pin, through-hole), with pin 1 = V_CC, pin 2 = GND, pin 3 = RESET (open-drain output).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC33064DR2G and TPS3808G33DBVR, TS831-5IZ-AP offers the best balance of guaranteed automotive temperature support, zero-component threshold accuracy, and sub-15µA consumption - making it optimal for space-constrained, high-reliability embedded systems where bill-of-materials simplicity and qualification assurance are prioritized.

Availability

TS831-5IZ-AP is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, and medical wearable devices requiring stable component supply with full AEC-Q100 alignment and long-term lifecycle commitment.

Supply support for TS831-5IZ-AP 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, delivering silicon solutions for automotive, industrial, and power management applications since 1987.

The TS831 series belongs to ST's precision analog supervisor product line, engineered specifically for fail-safe power monitoring in harsh-environment microcontroller systems where reliability, low power, and minimal external components are mandatory.

FAQ

What is the minimum V_CC required for TS831-5IZ-AP to assert a valid reset?

The TS831-5IZ-AP guarantees correct reset assertion down to V_CC = 1V, per Absolute Maximum Ratings and Electrical Characteristics tables. At 1V, the internal band-gap reference remains functional and the comparator maintains defined hysteresis and output state - enabling reset generation even during severe brown-out conditions where other supervisors cease operation.

Can TS831-5IZ-AP drive a 10kΩ pull-up to 1.8V logic rail?

Yes. With V_CC ≥ 2.4V and I_SINK = 100µA, V_OL is guaranteed ≤ 400mV (–40°C to +125°C), well below 1.8V logic low threshold. The open-drain output has no internal level-shifting limitation - its sink strength scales with V_CC, allowing interoperability with mixed-voltage systems including 1.8V, 2.5V, 3.3V, and 5V domains.

Is external hysteresis required when using TS831-5IZ-AP?

No. TS831-5IZ-AP integrates 100mV of factory-trimmed hysteresis between rising and falling threshold voltages (V_THI = 4.33V, V_THD = 4.21V). This eliminates the need for external positive feedback resistors, simplifying layout, improving temperature stability, and removing a common source of calibration drift in discrete supervisor circuits.

How does TS831-5IZ-AP differ from TS831-5I in SO-8 package?

TS831-5IZ-AP uses the TO-92 package (3-pin, through-hole), while TS831-5I uses SO-8 (8-pin surface-mount). Both share identical electrical specifications, temperature range (–40°C to +125°C), and functionality. The "Z" suffix denotes TO-92; "AP" indicates tape-and-reel packaging for automated assembly. Pinout is reduced to three terminals (V_CC, GND, RESET) - no NC pins - optimizing for compact, low-cost implementations.