STMicroelectronics STM1001RWX6F

Overview

STM1001RWX6F from STMicroelectronics is a precision voltage supervisor IC designed to monitor 2.55–2.70 V supply rails and assert an active-low open-drain reset signal during brownout conditions. It guarantees RST assertion down to VCC = 1.0 V, delivers 30 ms or 140 ms (configurable) minimum reset pulse width, draws only 6 µA typical supply current, and operates across –40 °C to +85 °C in industrial environments - used in microcontroller-based embedded systems requiring reliable power-on and dropout reset control.

For engineers reviewing the STM1001RWX6F datasheet, STM1001RWX6F pinout, STM1001RWX6F application, or STM1001RWX6F equivalent, key selection criteria include reset threshold accuracy (2.63 V typ at 25 °C), guaranteed operation down to 1.0 V VCC, SOT23-3 package compatibility, open-drain RST output with external pull-up requirement, and immunity to sub-20 µs/100 mV VCC transients.

Technical Context

The STM1001RWX6F implements a dedicated comparator-based reset generator with hysteresis, comparing VCC against a trimmed internal reference (VRST = 2.63 V typ). Its reset timing is governed by an internal RC-based timeout circuit that enforces trec ≥ 30 ms (Option B) or ≥140 ms (blank option), ensuring sufficient MCU initialization time after power-up or recovery.

It features no enable input or watchdog functionality - solely monitors VCC and asserts RST when voltage falls below VRST, holding RST low until VCC exceeds VRST for the full trec period. The open-drain RST output requires an external pull-up resistor and supports interfacing with multiple logic families (TTL, CMOS) via configurable voltage translation.

Key Specifications

Pinout & Package

SOT23-3 (WX) package: 3-pin, surface-mount, lead-free, moisture-sensitive level 1 (MSL1) per JEDEC J-STD-020. Dimensions: 2.80–3.04 mm length, 2.10–2.64 mm width, 0.89–1.12 mm height. Pin 1 (RST) is marked by a dot or beveled edge.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809RTR and TPS3808G12DBVR, the STM1001RWX6F offers tighter VRST tolerance (±25 mV vs ±50 mV), guaranteed 1.0 V operation (vs 1.1 V min), and native support for both 30 ms and 140 ms reset widths - making it optimal for cost-sensitive, space-constrained industrial controllers needing deterministic brownout response.

Availability

STM1001RWX6F is available at Aetrix Electronics and suitable for industrial PLC I/O modules, smart meter power management, automotive body control units, and medical portable diagnostic devices requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for STM1001RWX6F 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 microcontrollers, power management ICs, sensors, and analog products for industrial, automotive, and consumer markets.

The STM1001 belongs to ST's precision voltage supervisor product line, engineered specifically for reliable, low-power reset generation in resource-constrained embedded systems where supply rail integrity directly impacts functional safety and data integrity.

FAQ

What is the exact reset threshold voltage for STM1001RWX6F at 25 °C?

The STM1001RWX6F has a nominal reset threshold of 2.63 V at 25 °C, with a guaranteed range of 2.55 V to 2.66 V. This value is factory-trimmed and specified in Table 4 of the datasheet under "RESET thresholds" for the R version. It remains stable across temperature with a 45 ppm/°C coefficient.

Does STM1001RWX6F require an external pull-up resistor on the RST pin?

Yes - the RST output is open-drain and must be pulled up externally to a logic-compatible voltage (e.g., 3.3 V or 5 V) using a resistor typically between 4.7 kΩ and 10 kΩ. Figure 4 in the datasheet explicitly shows this configuration, and omission will prevent proper reset signaling to the MCU.

Can STM1001RWX6F operate with VCC below 1.2 V?

Yes - the device guarantees RST assertion down to VCC = 1.0 V over 0–70 °C, and down to 1.2 V over the full –40 to +85 °C range. Table 4 confirms VCC operating voltage minimum is 1.0 V at 0–70 °C and 1.2 V at –40 to +85 °C, enabling use in deep brownout scenarios.

How is the 30 ms vs. 140 ms reset pulse width selected for STM1001RWX6F?

The reset pulse width is determined by the ordering option: blank in position 5 of the part number (e.g., STM1001RWX6F) selects the 140–280 ms option; "B" (e.g., STM1001RBWX6F) selects 20–40 ms. This is fixed at manufacture - no external pin or resistor configures trec. See Table 6 in the datasheet for full ordering details.