STMicroelectronics STM1001SWX6F

Overview

STM1001SWX6F from STMicroelectronics is a precision voltage supervisor IC designed to monitor 2.85–3.00 V supply rails and assert an active-low open-drain reset signal (RST) when VCC drops below the 2.93 V (typ) threshold. It guarantees RST assertion down to VCC = 1.0 V, delivers a minimum 140 ms reset pulse width, draws only 7 µA typical supply current, and operates across –40 °C to +85 °C in industrial applications such as microcontroller-based embedded systems requiring reliable power-on reset.

For engineers reviewing the STM1001SWX6F datasheet, STM1001SWX6F pinout, STM1001SWX6F application, or STM1001SWX6F equivalent, this page provides verified functional identity, SOT23-3 terminal mapping, temperature-stable reset threshold behavior, transient immunity data, and validated alternative parts for 2.8–3.1 V supply monitoring use cases.

Technical Context

The STM1001SWX6F implements a dedicated comparator-based reset generator with hysteresis-free threshold detection and an internal timer that enforces a guaranteed minimum reset pulse width of 140 ms after power-up or brownout recovery. Its open-drain RST output requires an external pull-up resistor and remains valid even as VCC declines to 1.0 V - enabling robust reset assertion during deep undervoltage conditions.

It exhibits 45 ppm/°C reset threshold temperature coefficient and rejects short negative VCC transients: a 100 mV overdrive glitch lasting ≤20 µs will not trigger spurious reset pulses. A 0.1 µF bypass capacitor at VCC enhances immunity per design guidance.

Key Specifications

Pinout & Package

SOT23-3 (WX) package: 3-pin, lead-free, small-outline transistor outline with gull-wing leads; 0.95 mm max height, 2.8 mm × 2.1 mm body size, 0.95 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G18DBVR and MAX809SEUR+T, the STM1001SWX6F uniquely combines 2.93 V precision, 1.0 V minimum VCC operation, and documented 20 µs transient immunity-making it optimal for robust 3.0 V industrial reset supervision where supply integrity is marginal.

Availability

STM1001SWX6F is available at Aetrix Electronics and suitable for industrial PLCs, smart meters, POS terminals, and IoT sensor nodes requiring stable component supply, long-term lifecycle support, and guaranteed reset behavior under brownout and transient stress.

Supply support for STM1001SWX6F 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, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The STM1001 belongs to ST's precision voltage supervisor product line, engineered specifically for deterministic power-on reset and brownout protection in resource-constrained industrial and metering applications.

FAQ

What is the exact reset threshold voltage for STM1001SWX6F?

The STM1001SWX6F has a nominal reset threshold of 2.93 V at 25 °C, with guaranteed range of 2.85 V (min) to 3.00 V (max) across –40 °C to +85 °C. This value is factory-trimmed and specified in Table 4 of the datasheet (Doc ID 10373 Rev 6), corresponding to the "S" variant in the ordering code.

Does STM1001SWX6F support open-drain reset output with external pull-up?

Yes - RST is an open-drain output requiring an external pull-up resistor to a logic-compatible voltage (e.g., 3.3 V or 5 V). The datasheet specifies maximum leakage of ±1 µA when reset is not asserted and guarantees VOL ≤ 0.3 V at IOL = 50 µA, enabling direct interface with most MCU reset inputs.

Can STM1001SWX6F operate reliably during fast VCC transients?

Yes - it tolerates negative-going VCC transients up to 100 mV amplitude for durations ≤20 µs without generating false reset pulses, as confirmed in Figure 10 and Section 2.2. Adding a 0.1 µF ceramic capacitor at the VCC pin further improves immunity per design guidance.

What is the minimum VCC voltage at which RST remains valid?

RST is guaranteed to remain asserted and valid down to VCC = 1.0 V over 0 °C to +70 °C, and functional down to 1.2 V over the full –40 °C to +85 °C range. This ensures deterministic reset behavior during deep brownout events where other supervisors may release prematurely.