STMicroelectronics STM706TDS6E

Overview

STM706TDS6E 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 systems requiring reliable microprocessor reset control during brownout, startup, or software fault conditions.

For engineers reviewing the STM706TDS6E datasheet, STM706TDS6E pinout, STM706TDS6E application, or STM706TDS6E equivalent, key selection criteria include reset threshold tolerance (±2.5%), trec timing stability (200 ms typ.), push-pull RST/RST outputs, WDO watchdog feedback capability, and compatibility with 3 V microcontroller reset interfaces.

Technical Context

The STM706TDS6E integrates a precision bandgap reference, dual comparators (VCC monitor and PFI threshold), a 1.6 s watchdog timer with edge-sensitive WDI, and independent push-pull RST and RST outputs. Its reset logic asserts RST low when VCC drops below 3.00 V (or rises above it after power-up with 200 ms timeout), while MR and WDO can independently trigger reset via internal gating.

It features guaranteed RST assertion down to VCC = 1.0 V, a 40 µA typical supply current, and a dedicated power-fail comparator with VPFI ≈ 1.25 V (independent of VRST). The device supports bi-directional MCU reset pin interfacing via external series resistor and tolerates noise on MR via optional 0.1 µF capacitor.

Key Specifications

Pinout & Package

STM706TDS6E is housed in an 8-pin TSSOP package (3 mm × 3 mm body, DS suffix), compatible with high-density PCB layouts and reflow assembly. Pin functions are validated per ST's official SO8/TSSOP8 connection diagrams (Figures 3–4, DocID10518 Rev 14).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6361LUR29+T and TPS3808G33DBVR, STM706TDS6E uniquely combines fixed 3.00 V precision reset, integrated watchdog, and independent power-fail comparator in a single TSSOP8 package-enabling compact, feature-complete supervision without external components.

Availability

STM706TDS6E 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 STM706TDS6E 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, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.

The STM70x series is part of ST's precision power management portfolio, engineered specifically for robust microprocessor supervision in harsh environments where reliability, accuracy, and multi-function integration are critical.

FAQ

What is the function of the WDO pin on STM706TDS6E?

The WDO (Watchdog Output) pin goes low when the WDI input remains static for ≥1.6 s, signaling a watchdog timeout. It is a push-pull output that returns high immediately upon VCC recovery or WDI edge detection. WDO must be connected to MR to trigger system reset; otherwise, it serves as a standalone fault indicator.

Can STM706TDS6E be used with a 5 V supply?

Yes - STM706TDS6E supports VCC from 2.7 V to 5.5 V. Its 3.00 V reset threshold remains valid across this range, making it suitable for 5 V systems where the regulated 3.3 V or 3.0 V rail is monitored. The internal comparators and outputs operate correctly up to 5.5 V, with no derating required.

How does the power-fail comparator (PFI/PFO) differ from the main VCC monitor?

The PFI/PFO comparator uses a fixed 1.25 V internal reference, independent of the 3.00 V VCC reset threshold. This allows early detection of supply degradation - e.g., by connecting PFI to an unregulated input via a resistor divider - so PFO asserts before VCC drops below 3.00 V, enabling controlled shutdown or data save.

Is STM706TDS6E RoHS compliant and lead-free?

Yes - STM706TDS6E is RoHS-compliant and manufactured with lead-free terminations per EU Directive 2011/65/EU. The TSSOP8 package uses matte tin plating, and the device meets JEDEC J-STD-020 moisture sensitivity level MSL3, supporting standard reflow profiles.