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STMicroelectronics STM6720TWWB6F
- Part No.:
- STM6720TWWB6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
STM6720TWWB6F.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,147
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Product details
Overview
STM6720TWWB6F from STMicroelectronics is a dual ultra-low voltage supervisor IC with push-button reset, primary/secondary supply monitoring (VCC1/VCC2), adjustable RSTIN input, active-low push-pull RST output, and SOT23-6 package. It features factory-programmed reset thresholds (4.63 V to 1.58 V on VCC1; 3.08 V to 0.79 V on VCC2), 0.626 V internal reference for RSTIN, 13.2/210/900 ms power-up reset delay options, and 11 µA typical supply current at 3.6 V. Used in battery-powered networking equipment for reliable power-on reset sequencing.
For engineers reviewing the STM6720TWWB6F datasheet, STM6720TWWB6F pinout, STM6720TWWB6F application, or STM6720TWWB6F equivalent, key selection criteria include dual-supply monitoring capability, push-pull RST output compatibility with microprocessor reset inputs, manual reset with guaranteed state down to 0.8 V VCC, and SOT23-6 footprint suitability for space-constrained embedded designs.
Technical Context
The STM6720 implements independent voltage comparators for VCC1 and VCC2, each with factory-trimmed thresholds, plus a third comparator using the 0.626 V internal reference applied to RSTIN via external resistor divider. Reset assertion occurs if any monitored voltage falls below its threshold or MR is pulled low.
Reset release is delayed by trec (13.2/210/900 ms typ) after all supplies exceed thresholds and MR returns high. The push-pull RST output is referenced to VCC1 and guaranteed functional down to VCC1 ≥ 0.8 V, enabling robust reset signaling during brown-out conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | Factory-programmed 4.63 V to 1.58 V; sets primary supply valid window for microprocessor power sequencing. |
| VCC2 Threshold | Factory-programmed 3.08 V to 0.79 V; enables independent monitoring of auxiliary rail (e.g., I/O or analog supply). |
| RSTIN Reference | 0.626 V internal reference; allows user-defined reset threshold for third supply via external resistor divider. |
| Reset Delay (trec) | 13.2 / 210 / 900 ms (typ); ensures stable power-up before releasing processor reset, configurable at factory. |
| Supply Current | 11 µA (typ) at VCC1 = VCC2 = 3.6 V; minimizes quiescent load in battery-backed or energy-sensitive systems. |
| Operating Temp | –40 °C to +85 °C; supports industrial-grade operation in networking and portable equipment environments. |
| RST Output Type | Active-low push-pull; eliminates need for external pull-up and ensures defined logic state during full VCC range ≥ 0.8 V. |
Pinout & Package
SOT23-6 (WB) package: 6-pin surface-mount, 1.3 mm × 2.9 mm body, 0.95 mm height, 0.95 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RST | Active-low push-pull reset output | Drives low when VCC1/VCC2/RSTIN fault or MR asserted; remains low for trec after recovery; referenced to VCC1. |
| 2: VCC1 | Primary supply voltage input | Power source for internal circuitry and RST output stage; also monitored for reset generation. |
| 3: VCC2 | Secondary supply voltage input | Monitored independently; supports dual-rail systems (e.g., core + I/O supply) without external components. |
| 4: MR | Push-button reset input | Active-low manual reset; internal 50 kΩ pull-up; debounced via external switch to VSS; no external RC needed. |
| 5: RSTIN | Adjustable reset comparator input | High-impedance input for third supply monitoring; threshold set by resistor divider against 0.626 V internal reference. |
| 6: VSS | Ground reference | Common return path for VCC1, VCC2, MR, RSTIN, and RST output stage. |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-threshold monitoring | VCC1 (4.63–1.58 V) and VCC2 (3.08–0.79 V) thresholds factory-programmed per unit; eliminates external resistor networks. |
| Third adjustable supply monitor | RSTIN accepts external divider to set custom reset threshold using precise 0.626 V internal reference. |
| Guaranteed RST state at low VCC | RST output logic state is valid and controlled when VCC1 ≥ 0.8 V - critical for brown-out detection and safe shutdown. |
| Low quiescent current | 11 µA typical supply current enables use in always-on, battery-backed applications such as remote sensors or IoT edge nodes. |
| Multiple reset delay options | Three factory-set trec values (13.2/210/900 ms) accommodate diverse processor boot timing requirements without external timing components. |
Applications
| Industrial Networking Gateway | Portable Medical Monitor |
|---|---|
|
Use Scenario: Dual-rail power system (3.3 V core, 1.8 V I/O) with battery backup and push-button service reset. IC Role / Device Role / Timing Role: Monitors both rails simultaneously; asserts RST until both stabilize above thresholds; provides manual reset with hardware debounce. Use Value: Prevents processor lockup during power transitions; eliminates need for discrete comparators and RC timers; reduces BOM count by 4 components. |
Use Scenario: Battery-powered vital signs monitor requiring guaranteed reset during low-battery brown-out and clinician-initiated reboot. IC Role / Device Role / Timing Role: Supervises main 3.0 V supply and backup 2.5 V rail; uses RSTIN to monitor battery voltage via divider; delivers 210 ms reset hold time. Use Value: Ensures clean processor restart before data corruption occurs; 11 µA supply current extends battery life >12 months in standby mode. |
| Set-Top Box Power Management | Smart Home Hub Controller |
|
Use Scenario: Multi-voltage SoC platform (1.2 V core, 3.3 V peripherals, 5.0 V USB) with cold-start and warm-reset capability. IC Role / Device Role / Timing Role: VCC1 monitors 3.3 V peripheral rail; VCC2 monitors 1.2 V core; RSTIN tracks 5.0 V USB input; RST drives SoC reset pin directly. Use Value: Single-chip solution replaces three discrete supervisors; push-pull RST avoids contention with bi-directional SoC reset I/O. |
Use Scenario: Always-on Wi-Fi/Zigbee hub with deep-sleep wake-on-event and scheduled firmware updates requiring deterministic reset behavior. IC Role / Device Role / Timing Role: Monitors 3.3 V system rail and 1.8 V radio supply; MR initiates controlled update reset; trec = 900 ms ensures flash write completion before boot. Use Value: Eliminates risk of corrupted OTA updates due to premature reset release; -40 °C to +85 °C rating supports uncontrolled indoor environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G18DBVR | Single-supply monitor (VDD only); no VCC2 or RSTIN inputs; fixed 1.8 V threshold; open-drain RST. | Lacks secondary supply monitoring and adjustable third input; requires external pull-up and separate VCC2 supervisor. | Select when only primary rail supervision is required and board space permits additional components. |
| MAX6816EUT+T | Single-channel push-button debouncer with no voltage monitoring; no reset delay or supply supervision. | Provides only MR conditioning - no VCC1/VCC2/RSTIN monitoring or automatic power-on reset functionality. | Use only as supplemental MR interface; cannot replace STM6720's core supervision functions. |
Compared with TPS3808G18DBVR and MAX6816EUT+T, the STM6720TWWB6F uniquely integrates dual fixed-threshold monitoring, adjustable third-input supervision, and factory-configurable reset delay in one SOT23-6 package - reducing component count, PCB area, and design validation effort for multi-rail embedded systems.
Availability
STM6720TWWB6F is available at Aetrix Electronics and suitable for industrial networking gateways, portable medical monitors, set-top box power management, and smart home hub controllers requiring stable component supply across extended production lifecycles.
Supply support for STM6720TWWB6F 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, and analog/mixed-signal devices for industrial, automotive, and consumer markets.
The STM67xx family targets ultra-low-power, multi-rail supervision in space-constrained portable and networking equipment, emphasizing factory-programmable thresholds, minimal external components, and guaranteed operation down to 0.8 V VCC.
FAQ
What reset delay options are available for STM6720TWWB6F?
The STM6720TWWB6F offers three factory-programmed reset delay times: 13.2 ms, 210 ms, and 900 ms (typical). These values are fixed per device and selected at manufacturing - not user-adjustable via external components. The specific trec value for a given unit is encoded in the part marking and documented in the ordering information table of the datasheet.
Can STM6720TWWB6F monitor a 5.0 V supply?
Yes - the VCC1 input supports supply voltages up to 7.0 V absolute maximum, and factory-programmed VCC1 reset thresholds include 4.63 V, making it suitable for monitoring standard 5.0 V rails. The device asserts RST when VCC1 drops below the programmed threshold (e.g., 4.63 V), providing reliable undervoltage detection for legacy or auxiliary 5 V domains.
Is an external pull-up resistor required for the RST pin?
No - the STM6720TWWB6F features an active-low push-pull RST output, which actively drives both high and low states. Unlike open-drain variants, it does not require an external pull-up resistor. This simplifies layout, eliminates pull-up power loss, and ensures fast, rail-to-rail reset signal edges compatible with modern microprocessor reset inputs.
How is the RSTIN pin used to monitor a third supply?
RSTIN accepts a divided-down version of the third supply voltage, referenced to the internal 0.626 V comparator threshold. A resistor divider (e.g., R1 from supply to RSTIN, R2 from RSTIN to GND) sets the trip point as Vtrip = 0.626 × (R1 + R2)/R2. For example, monitoring a 12 V rail requires R1/R2 ≈ 18.1 to trigger reset at 12 V × (R2/(R1+R2)) = 0.626 V.
STM6720TWWB6F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.665V, 3.075V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
STM6720TWWB6F FAQ
1.How can I place an order for STM6720TWWB6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM6720TWWB6F on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM6720TWWB6F reliable?
The price and inventory of STM6720TWWB6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM6720TWWB6F is usually 5 days.
3.What payment methods are accepted for STM6720TWWB6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM6720TWWB6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM6720TWWB6F?
STM6720TWWB6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM6720TWWB6F order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM6720TWWB6F?
For technical support, including STM6720TWWB6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM6720TWWB6F requirements.
6.How does Aetrix verify that STM6720TWWB6F is sourced from the original manufacturer or authorized distributors?
All STM6720TWWB6F products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM6720TWWB6F meets industry standards.
7.What is the process for return or replacement of STM6720TWWB6F?
All STM6720TWWB6F units undergo pre-shipment inspection (PSI). If there is an issue with STM6720TWWB6F, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM6720TWWB6F part is unused and in its original packaging.
Return procedure for STM6720TWWB6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM6720TWWB6F Tags
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MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
Diodes Incorporated
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APX803L20-29SA-7
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