STMicroelectronics STM706TAM6F

Overview

STM706TAM6F from STMicroelectronics is a precision 3.00 V ±2.5% 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 STM706TAM6F datasheet, STM706TAM6F pinout, STM706TAM6F application, or STM706TAM6F equivalent, key selection criteria include reset threshold accuracy (3.00–3.15 V), trec timing (200 ms typ.), low quiescent current (40 µA typ.), push-pull RST/RST outputs, and compatibility with microprocessor bi-directional reset I/O interfaces.

Technical Context

The STM706TAM6F integrates a precision bandgap reference, dual comparators (VCC monitor and PFI threshold), a 1.6 s watchdog timer with WDI edge-triggered clearing, and independent RST/RST push-pull outputs. Its MR input features an internal 40 kΩ pull-up and supports TTL/CMOS logic or momentary switch interfacing without external debounce.

Reset assertion is guaranteed for VCC ≥ 1.0 V, and the power-fail comparator (VPFI = 1.25 V typ.) provides early warning of supply collapse via PFO. The device uses asynchronous reset generation - no clock required - and maintains valid output states across full industrial temperature range.

Key Specifications

Pinout & Package

STM706TAM6F is housed in an 8-pin TSSOP package (3 mm × 3 mm, DS variant), RoHS-compliant, with 0.65 mm pitch and exposed pad option per ST's mechanical data (DocID10518 Rev 14, Table 8).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UT31D3+ and TPS3808G33DBVR, STM706TAM6F uniquely combines 3.0 V precision reset, integrated watchdog, and predictive power-fail detection in a single TSSOP8 package - making it optimal for space-constrained industrial controllers requiring multi-layer fault coverage.

Availability

STM706TAM6F 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 STM706TAM6F 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 product line delivers highly integrated, low-power voltage supervisors targeting microprocessor-based systems needing robust power monitoring, reset control, and fault detection - especially in cost-sensitive, space-constrained industrial applications.

FAQ

What is the exact reset threshold voltage range for STM706TAM6F?

The STM706TAM6F has a guaranteed reset threshold (VRST) between 3.00 V and 3.15 V at 25 °C, with ±2.5% variation over temperature and supply voltage. This range is specified in ST's production datasheet (DocID10518 Rev 14, Section 1.1) and validated across –40 °C to +85 °C.

Can the watchdog timer be disabled without modifying the PCB layout?

Yes - the watchdog function is automatically disabled when the WDI pin is left floating (high-impedance), as confirmed in Section 2.2 and Section 3.3 of the datasheet. No external components or solder bridges are needed; this behavior is inherent to the internal circuit design.

How does the power-fail comparator interact with the reset output?

The PFI/PFO circuit operates independently of the VCC reset comparator. When PFI falls below 1.25 V, PFO goes low but does not directly assert RST unless externally wired to MR. This separation allows flexible system-level response - e.g., initiating graceful shutdown before reset occurs.

Is STM706TAM6F pin-compatible with other variants in the STM706 family?

Yes - STM706TAM6F (TSSOP8, "T" version) shares identical pinout and footprint with STM706SAM6F and STM706RAM6F per Figures 4 and Table 3. Differences are limited to reset threshold (3.00–3.15 V for "T", 2.88–3.00 V for "S", 2.59–2.70 V for "R") and marking code.