STMicroelectronics STM706TDS6F

Overview

STM706TDS6F from STMicroelectronics is a precision 3.00 V ±150 mV supply voltage supervisor IC with active-low RST, watchdog timer (1.6 s), manual reset input (MR), and power-fail comparator (PFI/PFO). It guarantees RST assertion down to VCC = 1.0 V and operates from –40 °C to +85 °C in industrial environments. Used for reliable reset generation in microprocessor-based embedded controllers and instrumentation.

For engineers reviewing the STM706TDS6F datasheet, STM706TDS6F pinout, STM706TDS6F application, or STM706TDS6F equivalent, key selection criteria include reset threshold accuracy (3.00–3.15 V), guaranteed low-VCC reset assertion, trec = 200 ms typ., and integrated PFI/PFO for early power-fail detection in space-constrained designs.

Technical Context

The STM706TDS6F integrates a precision bandgap reference, comparator-based VCC monitor, 200 ms reset timeout timer, and independent 1.6 s watchdog timer with WDI/WDO interface. Its dual reset outputs (RST active-low, no RST active-high) and push-pull PFO support direct interfacing to microcontrollers without external pull-ups.

It features an internal 40 kΩ MR pull-up, supports noise-immune manual reset via momentary switch, and includes a dedicated power-fail comparator with VPFI ≈ 1.25 V (independent of VRST) for predictive brownout signaling before VCC collapse.

Key Specifications

Pinout & Package

STM706TDS6F is housed in an 8-pin TSSOP package (3 mm × 3 mm, DS suffix), optimized for high-density PCB layouts. Pin assignments are validated per STMicroelectronics DocID10518 Rev 14 (Figures 4 & Table 3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6361LTT+T and TPS3808G33DBVR, STM706TDS6F uniquely combines precision 3.00 V reset, 1.6 s watchdog, and independent PFI/PFO in one TSSOP8 package - enabling single-chip system health monitoring where space, reliability, and predictive fault response are critical.

Availability

STM706TDS6F is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, smart energy meters, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for STM706TDS6F 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/mixed-signal devices for industrial, automotive, and consumer markets.

The STM70x series was developed specifically for robust, low-power microprocessor supervision in space-constrained industrial and instrumentation applications - emphasizing guaranteed reset behavior, integrated watchdog, and predictive power-fail detection.

FAQ

Can STM706TDS6F be used with a 5 V supply?

No. STM706TDS6F is specified for 3 V operation only, with absolute maximum V_CC = 6.0 V but functional operation limited to 2.7–3.6 V per datasheet Section 5. Applying 5 V exceeds recommended operating conditions and risks permanent damage or erratic reset behavior due to internal comparator saturation.

How is the watchdog timer disabled?

The watchdog is disabled by leaving WDI floating or tri-stating its driver, provided leakage current stays ≤10 µA and load capacitance ≤200 pF. No configuration register or external pin is required - this hardware-based disable method simplifies firmware development and avoids accidental timeout during debug sessions.

What is the purpose of the PFI/PFO function?

PFI monitors an external voltage (e.g., unregulated input) against a fixed 1.25 V internal reference. When PFI falls below that threshold, PFO asserts low - providing early warning of impending power failure before V_CC drops below the reset threshold, enabling controlled shutdown or data preservation.

Does STM706TDS6F require external pull-up resistors on RST or PFO?

No. Both RST and PFO are push-pull outputs with integrated drivers capable of sinking ≥10 mA and sourcing ≥5 mA. External pull-ups are unnecessary and may interfere with timing or cause contention; direct connection to MCU reset pins is supported per Figure 9 in the datasheet.