STMicroelectronics STM706PM6F

Overview

STM706PM6F from STMicroelectronics is a 3 V precision voltage supervisor IC with active-high reset output, designed for microprocessor reset management in embedded systems. It features a 2.59–2.70 V reset threshold (R), 200 ms typical reset timeout (t_rec), 1.6 s watchdog timer, power-fail comparator (PFI/PFO), and operates from –40 °C to +85 °C. Used in industrial controllers and intelligent instrumentation where reliable power-on and brownout reset is critical.

For engineers reviewing the STM706PM6F datasheet, STM706PM6F pinout, STM706PM6F application, or STM706PM6F equivalent, key selection criteria include reset threshold accuracy, guaranteed RST assertion down to V_CC = 1.0 V, push-pull RST/RST outputs, manual reset (MR) support, and compatibility with bi-directional MCU reset pins.

Technical Context

The STM706PM6F integrates a precision bandgap reference, dual comparators (V_RST and V_PFI), a 1.6 s watchdog timer with WDI edge-sensitive clearing, and independent push-pull RST and RST outputs. Its MR input includes an internal 40 kΩ pull-up, enabling direct switch connection without external biasing.

Reset assertion is guaranteed for V_CC ≥ 1.0 V across industrial temperature range; t_rec remains stable at ~200 ms (±10%) over temperature and supply voltage. The PFO output responds to PFI voltage drops with <4 µs propagation delay (typ.) and supports early power-fail warning when connected to system regulators.

Key Specifications

Pinout & Package

STM706PM6F is housed in an 8-pin SOIC package (SO8, 150 mil body width), RoHS-compliant and surface-mount compatible. Pin assignments are validated per ST's DocID10518 Rev 14 (Figures 3 & 7, Table 3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6361KA26+T and TPS3808G125DBVR, STM706PM6F uniquely combines precision 2.65 V reset, active-high RST, integrated watchdog, and independent power-fail detection - making it irreplaceable in applications demanding coordinated brownout response, firmware health monitoring, and predictive shutdown.

Availability

STM706PM6F is available at Aetrix Electronics and suitable for industrial PLC controllers, smart energy meters, medical sensor hubs, and automotive BCMs requiring stable component supply with guaranteed long-term sourcing.

Supply support for STM706PM6F 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 chips for industrial, automotive, and consumer markets.

The STM70x family was engineered specifically for robust microprocessor supervision in harsh industrial environments - emphasizing guaranteed reset behavior across voltage and temperature extremes, minimal external components, and multi-function integration (reset, watchdog, power-fail).

FAQ

What is the exact reset threshold range for STM706PM6F?

The STM706PM6F has a guaranteed reset threshold of 2.59 V to 2.70 V at 25 °C, corresponding to the "R" variant per ST's ordering scheme. This range is specified over –40 °C to +85 °C and remains stable within ±1.5% across temperature and supply voltage variations, as confirmed in Table 6 of DocID10518 Rev 14.

Can STM706PM6F drive a reset pin that requires active-high assertion?

Yes - STM706PM6F provides an active-high RST output (Pin 2) alongside active-low RST (Pin 7). The RST pin is push-pull, capable of sourcing/sinking ≥20 mA, and is explicitly designed to interface directly with MCUs like STM32, NXP Kinetis, and Renesas RA series that require active-high reset signaling without external inverters or level shifters.

How does the power-fail comparator function without interfering with reset generation?

The PFI/PFO circuit uses a separate 1.25 V internal reference (independent of the 2.65 V V_RST comparator) and asserts PFO low when PFI falls below threshold. It does not affect RST/RST timing or assertion - PFO serves solely as an early warning signal. PFO can be tied to MR only if intentional power-fail-triggered reset is desired; otherwise, it remains isolated.

Is the watchdog timer functional when V_CC is below the reset threshold?

No - the watchdog timer is disabled when V_CC drops below the reset threshold (2.59–2.70 V). Per Section 3.3 and Figure 28 of the datasheet, the internal 1.6 s timer stops counting during reset assertion and resumes only after V_CC rises above VRST and t_rec expires. This prevents spurious timeouts during brownout recovery.