STMicroelectronics STM6720TGWB6F

Overview

STM6720TGWB6F from STMicroelectronics is a dual ultra-low-voltage supervisor IC with push-button reset, primary (VCC1) and secondary (VCC2) supply monitoring, adjustable RSTIN input (0.626 V reference), active-low push-pull RST output, and industrial-grade operation (–40 °C to +85 °C). It delivers 13.2 ms / 210 ms / 900 ms selectable power-up reset delay and draws only 11 µA at 3.6 V - used in battery-powered embedded systems requiring reliable multi-rail power sequencing and manual reset.

For engineers reviewing the STM6720TGWB6F datasheet, STM6720TGWB6F pinout, STM6720TGWB6F application, or STM6720TGWB6F equivalent, key selection criteria include its SOT23-6 package, factory-trimmed VCC1 threshold (1.58 V to 4.63 V), VCC2 threshold (0.79 V to 3.08 V), guaranteed RST state down to VCC ≥ 0.8 V, and compatibility with bi-directional processor reset interfaces via external resistor isolation.

Technical Context

The STM6720 implements triple-supply supervision logic: VCC1 and VCC2 are monitored by independent comparators with factory-programmed thresholds, while RSTIN enables external voltage monitoring using an internal 0.626 V reference. Reset assertion occurs if any monitored rail falls below its threshold or MR is pulled low.

Reset deassertion requires all monitored supplies to exceed their thresholds *and* MR to return high, followed by a guaranteed minimum trec delay (13.2/210/900 ms typ). The RST output is push-pull active-low, referenced to VCC1, and remains valid as long as VCC1 or VCC2 ≥ 0.8 V - enabling robust reset hold during brown-out recovery.

Key Specifications

Pinout & Package

SOT23-6 (WB) package: 6-pin surface-mount, 1.3 mm × 2.9 mm footprint, 1.45 mm height, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply supervisor applications.

Compared with TPS3808G18DBVR and MAX6816EUT+T, the STM6720TGWB6F uniquely integrates dual fixed-threshold monitoring, a third adjustable rail input, and push-pull RST in one SOT23-6 package - eliminating up to three discrete components in multi-rail embedded designs.

Availability

STM6720TGWB6F is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, set-top box power management, and network router baseboards requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for STM6720TGWB6F 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 STM67xx family targets ultra-low-power, multi-rail supervision in space-constrained embedded systems - emphasizing factory-trimmed accuracy, minimal quiescent current, and seamless integration with microprocessor reset architectures.

FAQ

What is the function of the RSTIN pin on STM6720TGWB6F?

The RSTIN pin is a high-impedance input that compares an externally applied voltage (set via resistor divider) against an internal 0.626 V reference. When the divided voltage drops below this threshold, RST is asserted low. This enables precise monitoring of non-standard supply rails like 1.2 V or 1.8 V without trimming external resistors.

Can STM6720TGWB6F monitor three independent supply rails simultaneously?

Yes - it monitors VCC1 and VCC2 with factory-programmed thresholds, and RSTIN with an adjustable threshold based on the 0.626 V internal reference. All three comparators operate concurrently; RST asserts if *any* monitored rail falls below its respective threshold or if MR is pulled low.

Is the reset delay time (trec) user-selectable or fixed per device?

The trec delay is fixed per device variant and factory-programmed: 13.2 ms, 210 ms, or 900 ms (typical values). The STM6720TGWB6F uses the 210 ms option. No external components or configuration pins adjust this value - it is laser-trimmed during manufacturing for stability and repeatability.

Does STM6720TGWB6F require external pull-up resistors on the RST output?

No - the RST output is active-low push-pull, meaning it actively drives low and high states without external components. Unlike open-drain supervisors, it sources current during high state and sinks during low state, eliminating the need for a pull-up resistor and preventing contention with bi-directional processor reset pins when used with a series isolation resistor.