STMicroelectronics STM1001TWX6F

Overview

STM1001TWX6F from STMicroelectronics is a precision voltage supervisor IC designed to monitor 3.0 V supply rails in microprocessor-based systems, asserting an active-low open-drain reset signal (RST) when VCC falls below 3.08 V (typ), with guaranteed operation down to VCC = 1.0 V, 30 ms or 140 ms reset pulse width (min), and 6 µA typical supply current. It is used in industrial embedded controllers where reliable power-on and brownout reset behavior is critical.

For engineers reviewing the STM1001TWX6F datasheet, STM1001TWX6F pinout, STM1001TWX6F application, or STM1001TWX6F equivalent, key selection criteria include reset threshold accuracy (±25 mV over –40 °C to +85 °C), immunity to sub-100 mV/20 µs VCC transients, SOT23-3 footprint compatibility, and guaranteed RST assertion at ultra-low VCC for fail-safe MCU initialization.

Technical Context

The STM1001TWX6F implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below its factory-trimmed 3.08 V threshold (25 °C), triggering a monostable timer that holds RST low for ≥30 ms (Option B) or ≥140 ms (blank option). Its internal reset generator ensures clean deassertion only after VCC remains above VRST for trec (recovery time).

Designed for immunity to short-duration supply glitches, it tolerates negative-going VCC transients up to 100 mV amplitude for ≤20 µs without false reset assertion - validated by comparator overdrive vs. transient duration curves. The open-drain RST output requires an external pull-up resistor and supports interfacing with diverse logic families.

Key Specifications

Pinout & Package

SOT23-3 (WX) package: 3-pin, lead-free, small-outline transistor outline with gull-wing leads; body dimensions 2.90 mm × 2.40 mm × 1.02 mm (max); thermal pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3123QDBVRQ1 and MAX6326L30D3+T, the STM1001TWX6F offers selectable reset timing, lower operating current, and exact pinout compatibility with existing SOT23-3 supervisor footprints - making it optimal for industrial cost-sensitive designs requiring design reuse and power efficiency.

Availability

STM1001TWX6F is available at Aetrix Electronics and suitable for industrial PLCs, smart energy meters, programmable logic controllers, and human-machine interface controllers requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for STM1001TWX6F 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 consumer markets with emphasis on reliability, energy efficiency, and system integration.

The STM1001 belongs to ST's precision voltage supervisor product line, engineered specifically for robust power-monitoring in industrial control and metering applications where deterministic reset behavior under marginal supply conditions is non-negotiable.

FAQ

What is the exact reset threshold voltage for STM1001TWX6F at 25 °C?

The STM1001TWX6F has a nominal reset threshold of 3.08 V at 25 °C, with a guaranteed range of 3.04 V to 3.11 V per datasheet Table 4. This value is factory-trimmed and applies specifically to the 'T' variant, which targets 3.0 V supply monitoring with minimal headroom loss.

Does STM1001TWX6F 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 valid logic-high voltage (e.g., 3.3 V or 5 V). The datasheet specifies a 1.2 mA load for VOL testing in the 'T' version; typical pull-up values range from 10 kΩ to 100 kΩ depending on bus capacitance and rise-time requirements.

Can STM1001TWX6F operate reliably below 1.2 V VCC?

No - while the device guarantees RST assertion down to VCC = 1.0 V (0–70 °C), its specified operating voltage range is 1.2 V to 5.5 V per Table 4. Operation below 1.2 V is outside absolute maximum ratings and may result in undefined comparator behavior or incomplete internal biasing.

How does the STM1001TWX6F handle short VCC transients?

It suppresses false resets from transients ≤100 mV amplitude and ≤20 µs duration, as confirmed by Figure 10 in the datasheet. This immunity stems from internal comparator overdrive response characteristics and is enhanced by placing a 0.1 µF ceramic capacitor close to the VCC pin.