STMicroelectronics STM706RDS6E

Overview

STM706RDS6E from STMicroelectronics is a precision 3 V supply voltage supervisor IC with active-low reset output, watchdog timer, manual reset input, and power-fail comparator. It asserts RST low for ≥200 ms when VCC drops below 2.59–2.70 V, supports operation from –40 °C to +85 °C, draws only 40 µA typical supply current, and guarantees RST assertion down to VCC = 1.0 V - used in industrial microcontroller-based systems requiring reliable power-on and brownout reset.

For engineers reviewing the STM706RDS6E datasheet, STM706RDS6E pinout, STM706RDS6E application, or STM706RDS6E equivalent, this page delivers verified functional identity, TSSOP8 package mapping, validated 8-pin terminal roles, exact reset threshold range (2.59–2.70 V), watchdog timeout (1.6 s typ.), and real-world interface constraints for MCU reset coordination, power-fail warning, and watchdog supervision.

Technical Context

The STM706RDS6E integrates a precision bandgap reference, dual comparators (VCC monitor and PFI threshold), a 1.6 s watchdog timer with edge-triggered WDI, and push-pull RST/RST outputs. Its reset logic ensures monotonic assertion during power-up and brownout, with trec timing independent of VCC slew rate.

It implements a gated MR input with internal 40 kΩ pull-up, allows WDO-to-MR feedback for autonomous watchdog-triggered reset, and provides VPFI = 1.25 V ±1.5% for early power-fail detection - all operating within 1.0–5.5 V VCC range and industrial temperature grade.

Key Specifications

Pinout & Package

STM706RDS6E is housed in an 8-lead TSSOP package (3 mm × 3 mm body, DS suffix), with gull-wing leads, 0.65 mm pitch, and RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM706RDS6E, MAX6361LUR26+T omits watchdog and PFI functions entirely, limiting it to basic reset generation, while TPS3808G12DBVR trades integrated features for threshold flexibility but adds bill-of-materials complexity and removes autonomous fault coverage.

Availability

STM706RDS6E is available at Aetrix Electronics and suitable for industrial controllers, medical instrumentation, smart energy meters, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for STM706RDS6E 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 is ST's dedicated family of precision voltage supervisors targeting robust reset generation, watchdog supervision, and power-fail warning in resource-constrained embedded systems - optimized for reliability, low power, and industrial temperature operation.

FAQ

Can STM706RDS6E be used with a 5 V microcontroller?

Yes - STM706RDS6E operates over 1.0 V to 5.5 V VCC and features push-pull RST and PFO outputs compatible with 5 V TTL/CMOS logic levels. Its RST output remains valid down to VCC = 1.0 V, ensuring deterministic reset behavior even during deep brownout on 5 V rails. No level-shifting is required for direct interface.

How is the watchdog timer disabled?

The watchdog timer is disabled by allowing the WDI pin to float or by tri-stating its driver. When WDI is open-circuited, leakage current must remain below 10 µA and load capacitance under 200 pF to prevent false timeouts. This configuration is confirmed in ST's datasheet Section 2.2 and Figure 28 timing diagrams.

What is the purpose of the PFI/PFO pair?

PFI accepts a scaled version of the system's main supply (e.g., via resistor divider), and PFO asserts low when PFI falls below 1.25 V - providing early warning of impending power failure before VCC crosses the 2.59–2.70 V reset threshold. This enables controlled data save or state preservation in time-critical applications.

Does STM706RDS6E require external capacitors?

No external timing capacitors are required - t_rec (200 ms) and watchdog timeout (1.6 s) are internally generated. A 0.1 µF bypass capacitor on VCC is recommended per ST's layout guidelines (Figure 9), and optional 0.1 µF noise-filtering cap on MR improves immunity in noisy environments - but no capacitor is mandatory for core functionality.