STMicroelectronics TS831-4IPT

Overview

TS831-4IPT from STMicroelectronics is an ultra-low-power voltage supervisor IC with active-low open-drain reset output, precision 4.50 V threshold (typ.), 100 mV internal hysteresis, and guaranteed operation down to 1 V supply - used for power-on reset generation in microcontroller systems requiring high noise immunity and minimal quiescent current.

For engineers reviewing the TS831-4IPT datasheet, TS831-4IPT pinout, TS831-4IPT application, or TS831-4IPT equivalent, this device delivers verified reset accuracy over -40°C to +125°C, sub-12 µA supply current at 5 V, fast 20 µs response to 10 mV overdrive, and compatibility with MC33064/MC33164-based designs where low-voltage supervision and thermal stability are critical.

Technical Context

The TS831-4IPT integrates a thermally matched band-gap reference and comparator in a single die, enabling stable threshold voltage (4.50 V typ.) across temperature without external components. Its internal hysteresis (100 mV) prevents chatter during slow-rising or noisy V_CC transitions.

It operates as a reset generator with active-low open-drain output requiring an external pull-up resistor. The comparator triggers reset when V_CC falls below V_THD (4.40–4.66 V), and releases reset only after V_CC rises above V_THI (4.18–4.70 V), ensuring reliable power sequencing in embedded systems.

Key Specifications

Pinout & Package

TSSOP8 (Thin Shrink Small Outline Package), 8-pin, surface-mount, tape-and-reel delivery (PT suffix). Pin 1 marked by notch or dot; body dimensions: 3.0 × 6.4 mm, 0.65 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC33064DR2G and TPS3808G33DBVR, the TS831-4IPT uniquely combines 1 V operational capability, 12 µA ICC, and pin-compatible open-drain output - making it optimal for legacy-compatible, ultra-low-power reset supervision in constrained thermal and supply environments.

Availability

TS831-4IPT is available at Aetrix Electronics and suitable for microcontroller power-on reset, industrial PLC monitoring, automotive body control modules, and smart meter battery backup circuits requiring stable component supply and long-term lifecycle assurance.

Supply support for TS831-4IPT 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 silicon solutions for automotive, industrial, and consumer markets since 1987.

The TS831 series belongs to ST's precision analog supervisory IC product line, engineered specifically for high-reliability reset generation in resource-constrained embedded systems where low power, thermal stability, and small footprint are mandatory.

FAQ

What is the minimum supply voltage required for TS831-4IPT to assert reset?

The TS831-4IPT guarantees reset assertion down to V_CC = 1 V, with full electrical specifications validated across -40°C to +125°C. Below 1 V, the device may not reliably trigger reset due to insufficient internal biasing - design margins should maintain ≥1.0 V for guaranteed operation.

Can TS831-4IPT drive a 10 kΩ pull-up resistor directly?

Yes - with V_CC = 4 V and I_OL = 8 mA, the output low voltage is specified at 1.3 V max over temperature, yielding sufficient noise margin for standard CMOS inputs. At 10 kΩ pull-up to 3.3 V, sink current is ~330 µA, well within the 20 mA absolute maximum rating.

Is the 4.50 V threshold trimmed at wafer level or post-package?

The 4.50 V threshold is set using laser-trimmed, thermally matched thin-film resistors integrated during wafer fabrication. This process achieves ±2% tolerance over temperature without post-package calibration, confirmed by production test data on pages 2–3 of the official ST datasheet (Doc ID 017202 Rev 3).

Does TS831-4IPT require an external capacitor for stability?

No external capacitor is required for basic reset operation. The internal comparator and reference are fully compensated. However, if the V_IN node exhibits high-frequency noise (>1 MHz), a 100 nF ceramic capacitor placed close to Pin 1 and Pin 2 improves noise rejection without affecting response time.