STMicroelectronics STM6710LWB6F

Overview

STM6710LWB6F from STMicroelectronics is a quad-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring 5.0 V (–5%), 3.3 V (–5%), 1.8 V (–5%), and adjustable input with 0.62 V threshold (±1.5%). It delivers 200 ms reset timeout, <35 µA quiescent current, and open-drain RESET output with 10 µA internal pull-up to V2IN. Used in server/workstation power sequencing to ensure reliable boot under multi-rail brownout conditions.

For engineers reviewing the STM6710LWB6F datasheet, STM6710LWB6F pinout, STM6710LWB6F application, or STM6710LWB6F equivalent, key selection criteria include factory-trimmed –5% voltage thresholds across four rails, guaranteed operation down to V1IN/V2IN = 1.0 V, immunity to supply transients, and compatibility with manual reset integration via external push-button.

Technical Context

The STM6710LWB6F implements independent comparator-based monitoring of four input voltages (V1IN–V4IN), each compared against factory-programmed thresholds (5.0 V, 3.3 V, 1.8 V at –5% tolerance) or the adjustable 0.62 V reference. All comparators feed a wired-OR logic that asserts active-low RESET when any input falls below its trip point.

RESET remains asserted for 200 ms (typ.) after all inputs recover above threshold, with hysteresis of 0.3% and temperature coefficient of 60 ppm/°C. The device is powered from V2IN - which is itself monitored - enabling true quad-supply supervision without external bias.

Key Specifications

Pinout & Package

SOT23-6 (WB) package: 2.8 mm × 1.75 mm × 1.3 mm body, 0.95 mm pitch, RoHS-compliant ECOPACK® tape-and-reel (3000 pcs/reel).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX6816EUT+T, the STM6710LWB6F uniquely integrates factory-trimmed 5.0 V/3.3 V/1.8 V thresholds with adjustable fourth input in one SOT23-6 device - reducing layout complexity, improving timing consistency, and eliminating resistor matching errors in multi-rail systems.

Availability

STM6710LWB6F is available at Aetrix Electronics and suitable for server/workstations, networking equipment, and telecommunications infrastructure requiring stable component supply across extended temperature ranges (–40 °C to +105 °C).

Supply support for STM6710LWB6F 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 analog, MCU, power, and sensor solutions for industrial, automotive, and communications markets.

The STM67xx series is ST's precision low-voltage supervisory product line targeting high-reliability multi-rail systems in data center, telecom, and industrial computing - emphasizing accuracy, low power, and compact packaging.

FAQ

What is the minimum valid input voltage for RESET assertion on STM6710LWB6F?

The RESET output remains valid (capable of asserting low) as long as either V1IN or V2IN exceeds 1.0 V. Below this level, internal comparator biasing fails and RESET behavior is undefined. This 1.0 V minimum ensures reliable reset assertion during deep brownout events before total power loss, supporting fail-safe system shutdown in server and telecom applications.

Can V4IN be used to monitor a 1.05 V CPU core rail?

Yes. With its 0.62 V ±1.5% adjustable threshold, V4IN supports custom rail monitoring via an external resistor divider. For a 1.05 V rail, use R1 = 69.4 kΩ and R2 = 100 kΩ (per Equation 2), yielding VTH = 0.62 V × (1 + R1/R2) ≈ 1.05 V. Input bias current (<0.2 µA) ensures <1% error with standard 1% resistors.

Does STM6710LWB6F require an external pull-up resistor on the RESET pin?

No external pull-up is required. The device integrates a 10 µA weak internal pull-up to V2IN, sufficient to drive standard CMOS inputs. External pull-ups are only needed when interfacing to higher-voltage logic (e.g., 5 V MCU) - in which case the internal pull-up is safely overdriven without reverse current flow, thanks to built-in protection circuitry.

How does the STM6710LWB6F handle unused voltage monitor inputs?

Unused VxIN pins (e.g., V3IN or V4IN when not needed) must not be left floating or grounded. Connect them to a supply voltage exceeding their threshold (e.g., tie V3IN to 3.3 V) or use a 1 MΩ resistor from the unused pin to V2IN. This prevents false resets caused by leakage-induced voltage drift and maintains comparator stability per ST's design guidelines.