STMicroelectronics STM706DS6E

Overview

STM706DS6E from STMicroelectronics is a 5 V precision voltage supervisor IC with dual reset outputs (active-low RST and active-high RST), watchdog timer, manual reset input (MR), and power-fail comparator (PFI/PFO). It monitors VCC for out-of-tolerance conditions (4.25 V to 4.50 V reset threshold), asserts reset down to VCC = 1.0 V, and delivers 200 ms typical reset timeout (trec) - used in industrial microcontroller systems requiring reliable power-on and brownout recovery.

For engineers reviewing the STM706DS6E datasheet, STM706DS6E pinout, STM706DS6E application, or STM706DS6E equivalent, key selection criteria include its automotive-grade temperature range (–40 °C to 125 °C), push-pull RST/RST outputs, 1.6 s watchdog timeout, PFI threshold of 1.25 V (typ), and guaranteed reset assertion at ultra-low VCC - critical for fail-safe embedded control and power management validation.

Technical Context

The STM706DS6E integrates a precision bandgap reference, dual comparators (VCC monitor and independent PFI threshold), a 1.6 s watchdog timer with WDI edge-sensitive clearing, and trec-based reset timing logic. Its dual RST outputs enable direct interfacing with MCUs requiring either active-low or active-high reset signaling without external inversion.

It features an internal 40 kΩ MR pull-up, push-pull RST/RST/PFO outputs, and a dedicated WDO output that transitions low on watchdog timeout or VCC undervoltage - configurable as a self-resetting watchdog when wired to MR. The device operates across full industrial and automotive temperature ranges with guaranteed functionality down to VCC = 1.0 V.

Key Specifications

Pinout & Package

STM706DS6E is housed in an 8-pin TSSOP package (3 mm × 3 mm body, DS suffix), optimized for space-constrained PCB layouts while maintaining thermal and electrical performance comparable to SOIC-8.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX692AESA+ and TPS3808G33DBVR, the STM706DS6E uniquely combines automotive temperature range, dual-polarity reset outputs, integrated power-fail warning, and guaranteed sub-1 V reset assertion - making it irreplaceable in safety-critical 5 V systems demanding comprehensive power integrity coverage.

Availability

STM706DS6E is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply with long-term lifecycle assurance.

Supply support for STM706DS6E 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 specializing in power management, microcontrollers, and analog ICs, with manufacturing aligned to ISO/TS 16949 and environmental compliance standards.

The STM70x series targets robust power supervision in mission-critical embedded systems, delivering integrated reset, watchdog, and power-fail monitoring in compact packages for automotive, industrial, and medical applications.

FAQ

What is the function of the WDO pin on STM706DS6E?

The STM706DS6E does not feature a WDO pin. Unlike STM705/STM813L, the STM706 variant omits the watchdog output; its watchdog function is internal and only affects RST/RST assertion when WDI times out. This is confirmed in Table 1 (Device Summary) and Figure 2 logic diagram - WDO is absent for STM706.

Can STM706DS6E be used in a 3.3 V system?

No. STM706DS6E is specified exclusively for 5 V operation (4.5 V to 5.5 V VCC range) with a 4.25–4.50 V reset threshold. Its internal reference and comparator circuitry are calibrated for 5 V rails; operation below 4.5 V violates absolute maximum ratings and invalidates reset behavior per Section 5 (Maximum Ratings) and Section 6 (DC/AC Parameters).

How does the PFI/PFO function interact with the main reset circuitry?

PFI/PFO operates independently of the VCC monitor: PFI compares against a fixed 1.25 V internal reference (VPFI), while RST activation depends on VCC crossing the 4.25–4.50 V VRST threshold. PFO going low signals impending supply failure but does not directly assert RST unless externally wired to MR - enabling flexible system-level response strategies without coupling timing domains.

Is STM706DS6E RoHS compliant and lead-free?

Yes. Per Section 1 (Features) of the datasheet, STM706DS6E is RoHS-compliant and uses lead-free packaging. The "DS" in the part number denotes the TSSOP-8 package, which - as confirmed in Table 7 and Table 8 - meets JEDEC J-STD-020 moisture sensitivity and RoHS Directive 2011/65/EU requirements, with lead content below 1000 ppm.