STMicroelectronics STM6710FWB7F

Overview

STM6710FWB7F from STMicroelectronics is a quad-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring up to four supply rails (5.0 V, 3.3 V, 1.8 V, and adjustable input) with factory-trimmed –5% threshold accuracy. It delivers 200 ms reset timeout (typ.), <35 µA quiescent current, and open-drain RESET output with 10 µA internal weak pull-up to V2IN. Used in server/workstation power sequencing where multi-rail voltage integrity must trigger reliable system reset.

For engineers reviewing the STM6710FWB7F datasheet, STM6710FWB7F pinout, STM6710FWB7F application, or STM6710FWB7F equivalent, key selection criteria include its –40 °C to +105 °C operating range, quad-input supervision capability, 0.62 V adjustable threshold accuracy (±1.5%), immunity to power transients, and compatibility with manual reset integration via external push-button.

Technical Context

The STM6710FWB7F operates as a quad-voltage supervisor powered by V2IN, which is both supply and monitored rail - distinguishing it from triple-monitor STM6700 variants. Its internal comparators monitor V1IN (5.0 V), V2IN (3.3 V), V3IN (1.8 V), and V4IN (adjustable), each with factory-set thresholds and 0.3% hysteresis to suppress noise-induced oscillation.

RESET assertion is active-low, open-drain, and remains valid down to V1IN or V2IN ≥ 1.0 V. The device supports external resistor-divider configuration on adjustable inputs (V1IN/V3IN/V4IN), enabling custom trip points above 0.62 V with <1% error using ≤100 kΩ resistors and ±0.2 µA input bias current.

Key Specifications

Pinout & Package

SOT23-6 (WB) package: 6-pin surface-mount, 2.8 mm × 1.75 mm footprint, 1.3 mm height, RoHS-compliant ECOPACK® tape-and-reel packaging (3000 pcs/reel).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-voltage supervisory applications.

Compared with MAX6342EUT+T and TPS3808G33DBVR, the STM6710FWB7F uniquely integrates quad-rail supervision-including one field-configurable input-in a single SOT23-6 package with extended temperature support, eliminating design complexity and PCB area overhead required by multi-IC alternatives.

Availability

STM6710FWB7F is available at Aetrix Electronics and suitable for server/workstations, industrial PLCs, telecom line cards, and notebook embedded controller designs requiring stable component supply across extended temperature ranges and multi-rail power integrity assurance.

Supply support for STM6710FWB7F 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 silicon solutions for automotive, industrial, and consumer markets since 1987.

The STM67xx series was developed specifically for high-accuracy, low-power multi-voltage supervision in space-constrained computing and communications platforms - prioritizing precision threshold matching, transient immunity, and extended temperature reliability.

FAQ

What is the minimum operating voltage for V2IN on STM6710FWB7F?

The minimum V2IN supply voltage is 1.2 V over the full –40 °C to +105 °C temperature range, per Table 4 of the datasheet. Below this, internal comparators and RESET logic may not function reliably. At room temperature, operation down to 1.0 V is specified, but industrial designs must respect the 1.2 V lower limit for guaranteed performance across the rated temperature span.

Can V4IN be used to monitor a 2.5 V rail without external resistors?

No - V4IN has a fixed internal reference of 0.62 V (±1.5%). To monitor 2.5 V, an external resistor divider must be connected to scale the 2.5 V input down to 0.62 V at the pin. Equation 2 in the datasheet (R1 = R2 × (VTHx/0.62 V − 1)) defines the exact ratio; for 2.5 V, R1 ≈ 3.03 × R2 yields correct scaling with <1% error using ≤100 kΩ resistors.

How does the STM6710FWB7F handle unused input pins?

Unused VxIN pins (e.g., V3IN or V4IN when not configured) must not be left floating or tied to GND. Per Section 4.3, connect them to V2IN via a 1 MΩ resistor to limit bias current and prevent false triggering. This maintains comparator input stability while avoiding excessive leakage or noise coupling into active monitoring channels.

Is manual reset functionality supported on STM6710FWB7F?

Yes - Section 4.4 of the datasheet details manual reset integration: a push-button switch between any VxIN pin and GND initiates RESET. The switch must remain closed ≥140 ms to assert RESET, and open ≥140 ms to deassert it. No external debounce circuitry is needed; internal timing ensures clean pulse generation even with mechanical switch bounce.