STMicroelectronics STM707DS6E

Overview

STM707DS6E from STMicroelectronics is a 5 V precision voltage supervisor IC with dual active-low and active-high reset outputs, power-fail comparator (PFI/PFO), and no watchdog timer. It monitors VCC for out-of-tolerance conditions (4.50–4.75 V reset threshold), asserts RST/RST for ≥200 ms after power-up or fault, and operates from –40 °C to 85 °C in industrial applications such as microcontroller-based power management systems.

For engineers reviewing the STM707DS6E datasheet, STM707DS6E pinout, STM707DS6E application, or STM707DS6E equivalent, key selection considerations include its dual-reset output polarity, absence of watchdog functionality (distinguishing it from STM705/706), PFI threshold of 1.25 V ±1%, guaranteed RST assertion down to VCC = 1.0 V, and TSSOP8 package compatibility with space-constrained embedded designs.

Technical Context

The STM707 implements a dual-comparator architecture: one precision bandgap reference comparator monitors VCC against VRST (4.50–4.75 V) to control RST and RST outputs, while a second independent comparator compares PFI against VPFI (1.25 V) to drive PFO. Reset timing uses an internal trec generator ensuring ≥200 ms minimum assertion duration after VCC recovery or MR release.

No internal watchdog timer is present-unlike STM705/706/813L-making STM707 suitable for systems requiring only voltage supervision and power-fail warning without software watchdog oversight. Both RST and RST are push-pull outputs, and MR features an internal 40 kΩ pull-up resistor enabling direct switch-to-ground manual reset without external components.

Key Specifications

Pinout & Package

STM707DS6E is housed in an 8-pin TSSOP package (3 mm × 3 mm body, DS suffix), optimized for high-density PCB layouts. Pin functions are validated per STMicroelectronics DocID10520 Rev 11, Figure 6 and Table 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM706DS6E, STM707DS6E removes watchdog complexity for simpler, lower-power supervision; versus MAX692CPA+, it delivers 60% smaller footprint and 3× lower supply current while retaining identical functional scope for 5 V systems.

Availability

STM707DS6E is available at Aetrix Electronics and suitable for industrial PLC controllers, medical infusion pumps, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for STM707DS6E 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 devices for industrial, automotive, and consumer markets.

The STM70x series was developed specifically for robust, low-power microprocessor supervision in space-constrained industrial and medical equipment, emphasizing precision threshold accuracy, guaranteed low-VCC operation, and dual-reset flexibility.

FAQ

What is the function of the NC pin on STM707DS6E?

Pin 3 is designated NC (No Connect) and is internally unconnected. It must remain un-routed and un-terminated on the PCB-neither grounded nor pulled high. This pin has no electrical function and serves only as a mechanical placeholder in the TSSOP8 package layout.

Can STM707DS6E be used with a 3.3 V microcontroller?

No-STM707DS6E is specified only for 5 V operation (VCC = 4.5–5.5 V). Its internal comparators, reset thresholds, and output drive levels are calibrated for 5 V rails. Using it with 3.3 V systems risks incorrect reset assertion, undefined output states, and potential damage due to overvoltage on RST/RST pins if interfaced directly.

How does the power-fail comparator (PFI/PFO) interact with the reset outputs?

PFI/PFO operates independently of VCC supervision: when PFI voltage falls below 1.25 V, PFO asserts low but does not trigger RST/RST unless externally wired to MR. This decoupling allows designers to use PFO solely for system-level warning (e.g., logging or LED alert) or cascade it into MR for automatic reset-providing flexible fault-response strategies.

Is there a recommended external capacitor for noise immunity on the MR pin?

Yes-a 0.1 µF ceramic capacitor from MR to VSS is recommended when MR is driven via long traces (>5 cm) or in electrically noisy environments (e.g., near motors or switching regulators). This capacitor suppresses fast transients without affecting the 200 ms trec timing, as MR's internal 40 kΩ pull-up ensures proper DC biasing.