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STMicroelectronics STM6779VWB6F
- Part No.:
- STM6779VWB6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
STM6779VWB6F.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,028
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Product details
Overview
STM6779VWB6F from STMicroelectronics is a triple ultra-low-voltage supervisor IC with push-button reset and delayed manual reset capability. It monitors VCC1 (factory-trimmed threshold), VCC2 (secondary supply), and RSTIN (externally adjustable via 0.626 V internal reference), delivers active-low open-drain RST output, and operates across –40 °C to +85 °C with 11 µA typical supply current. It is used in battery-powered networking equipment requiring reliable multi-rail power sequencing and user-initiated reset with noise-immune delay.
For engineers reviewing the STM6779VWB6F datasheet, STM6779VWB6F pinout, STM6779VWB6F application, or STM6779VWB6F equivalent, key selection criteria include its dual fixed-threshold monitoring (VCC1/VCC2), RSTIN-based tertiary voltage supervision, MRC-capable manual reset delay (6 µs to >4 s), open-drain RST output requiring external pull-up, and guaranteed reset state down to VCC ≥ 0.8 V.
Technical Context
The device implements three independent voltage comparators: one for VCC1 (factory-programmed thresholds from 4.63 V to 1.58 V), one for VCC2 (thresholds from 3.08 V to 0.79 V), and one for RSTIN referenced to a stable 0.626 V internal bandgap. Reset assertion occurs if any monitored voltage falls below its threshold or MR is pulled low.
Reset release is synchronized to trec (13.2 ms / 210 ms / 900 ms typ) after all monitored supplies exceed their thresholds and MR returns high; the MRC pin enables programmable delay of MR-triggered reset using an external capacitor tied to VSS, supporting precise timing control without additional logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | Factory-programmed 4.63 V to 1.58 V; sets primary supply brown-out detection point for microprocessor core rail. |
| VCC2 Threshold | Factory-programmed 3.08 V to 0.79 V; enables secondary rail (e.g., I/O or memory) monitoring independent of VCC1. |
| RSTIN Reference | 0.626 V internal reference; allows precise adjustment of third-supply threshold (e.g., analog or sensor rail) via resistor divider. |
| Reset Delay (trec) | 13.2 ms / 210 ms / 900 ms typ; ensures stable power-up before releasing processor reset, preventing premature execution. |
| Supply Current | 11 µA typ at VCC1 = VCC2 = 3.6 V; minimizes quiescent load in always-on battery-backed systems. |
| Operating Temp | –40 °C to +85 °C industrial grade; supports deployment in uncontrolled ambient environments like outdoor gateways. |
| Reset Output Type | Active-low open-drain; requires external pull-up to VCC1 (e.g., 10 kΩ), enabling wired-OR reset bus sharing. |
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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RST | Active-low open-drain reset output | Drives low when any monitored voltage fails or MR is asserted; requires external pull-up to VCC1 for proper logic level. |
| 2: VCC1 | Primary supply voltage input | Power source and reference for internal circuitry; also defines reset threshold for main system rail. |
| 3: MRC | Manual reset delay input | Accepts external capacitor to VSS; sets delay (≥6 µs) between MR press and RST assertion, suppressing bounce or ESD-induced false resets. |
| 4: MR | Push-button reset input | Active-low input with internal 50 kΩ pull-up; debounced by design-no external RC needed unless operating in high-noise environments. |
| 5: RSTIN | Adjustable reset comparator input | High-impedance node referenced to 0.626 V internal reference; enables monitoring of arbitrary low-voltage rails (e.g., 1.2 V, 1.8 V) via resistor divider. |
| 6: VSS | Ground | Common return path for all internal comparators and logic; must be low-impedance to ensure accurate threshold sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring | Simultaneous supervision of VCC1 (core), VCC2 (I/O), and RSTIN (custom rail) eliminates need for multiple discrete supervisors. |
| Programmable manual reset delay | MRC pin enables capacitor-based delay (6 µs to >4 s) on MR assertion, removing requirement for external timer IC or firmware debounce. |
| Guaranteed reset state at low VCC | Valid RST output ensured when VCC1 or VCC2 ≥ 0.8 V-critical for clean shutdown and wake-up in brown-out conditions. |
| Low quiescent current | 11 µA typical supply current extends battery life in portable or energy-harvesting applications without sacrificing supervision accuracy. |
| Industrial temperature range | –40 °C to +85 °C operation validated across full range, supporting deployment in telecom infrastructure and industrial edge nodes. |
Applications
| Set-Top Box Power Management | Portable Medical Monitor |
|---|---|
Use Scenario: Monitors 3.3 V main processor rail, 1.8 V interface rail, and 1.2 V analog sensor rail during cold start and brown-out events. IC Role / Device Role / Timing Role: Triple-rail supervisor ensuring coordinated reset release only after all rails stabilize above factory-set thresholds. Use Value: Prevents partial initialization and data corruption by enforcing strict power sequencing before CPU boot. | Use Scenario: Supervises battery-backed 3.0 V MCU rail, 2.5 V display driver rail, and 1.5 V biosensor signal chain in handheld diagnostic device. IC Role / Device Role / Timing Role: Provides fail-safe reset with MRC-delayed MR to suppress false triggers from tactile button contact bounce. Use Value: Eliminates need for software-based debounce, reducing firmware complexity and improving field reliability. |
| Industrial Ethernet Gateway | Smart Home Hub |
Use Scenario: Tracks 5.0 V PoE-derived rail, 3.3 V PHY rail, and 2.5 V RF transceiver rail in DIN-rail mounted gateway exposed to wide ambient swings. IC Role / Device Role / Timing Role: Industrial-grade triple supervisor with –40 °C to +85 °C operation and open-drain RST for shared reset bus. Use Value: Ensures deterministic reset behavior across temperature extremes without derating or margin loss. | Use Scenario: Manages 3.3 V SoC rail, 1.8 V Wi-Fi module rail, and 1.2 V Zigbee co-processor rail in always-on residential hub with push-button recovery. IC Role / Device Role / Timing Role: Enables user-initiated system recovery via momentary switch on MR, with MRC capacitor setting 200 ms delay to avoid accidental presses. Use Value: Delivers intuitive hardware-level recovery without requiring app interaction or network connectivity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Single-supply monitor (VDD only); no VCC2 or RSTIN inputs; fixed 3.3 V threshold; no MRC pin. | Limited to single-rail systems; cannot replace triple-monitoring function without adding external comparators. | Select only when supervising one rail and cost sensitivity outweighs feature requirements. |
| MAX6816EUT+T | Single-channel push-button debouncer (no voltage monitoring); open-drain output; no supply supervision capability. | Provides MR debouncing only-requires separate supervisor IC for power monitoring. | Use only as supplemental MR conditioner alongside a basic supervisor, not as functional replacement. |
Compared with TPS3808G33DBVR and MAX6816EUT+T, STM6779VWB6F uniquely integrates triple-rail monitoring, adjustable RSTIN threshold, and capacitor-programmable MR delay in a single SOT23-6 package-reducing BOM count, PCB area, and design validation effort for multi-rail embedded systems.
Availability
STM6779VWB6F is available at Aetrix Electronics and suitable for set-top boxes, portable medical monitors, industrial gateways, and smart home hubs requiring stable component supply and long-term industrial-grade availability.
Supply support for STM6779VWB6F 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, delivering silicon solutions for automotive, industrial, and consumer markets with emphasis on reliability and energy efficiency.
The STM67xx family targets low-power embedded systems needing robust, multi-rail power supervision-designed specifically for battery-operated, networking, and portable electronics where space, current budget, and reset integrity are critical.
FAQ
What is the function of the MRC pin on STM6779VWB6F?
The MRC (Manual Reset Delay) pin accepts an external capacitor connected to VSS to introduce a programmable delay (≥6 µs) between MR assertion and RST activation. This prevents false resets caused by mechanical switch bounce or transient noise, eliminating the need for external debounce circuitry or firmware intervention.
Can STM6779VWB6F monitor a 1.2 V supply rail?
Yes-via the RSTIN pin, which references an internal 0.626 V comparator. A resistor divider (e.g., R1 = 100 kΩ, R2 = 100 kΩ) scales the 1.2 V rail to 0.6 V at RSTIN, triggering reset when the rail drops below ~1.25 V (accounting for tolerance). The datasheet provides design equations for precise threshold setting.
Why does STM6779VWB6F use an open-drain RST output instead of push-pull?
The open-drain RST output enables wired-OR connection with other reset sources (e.g., watchdog timers, other supervisors) on a shared reset bus. It also allows flexible pull-up to any compatible voltage (e.g., VCC1 or another rail), supporting mixed-voltage system architectures without level-shifting components.
Is STM6779VWB6F qualified for automotive applications?
No-STM6779VWB6F is specified for industrial temperature range (–40 °C to +85 °C) and is not AEC-Q100 qualified. For automotive use, ST offers the pin-compatible STM6779WYB6F variant in SOT23-5 with extended qualification, or the automotive-grade STM6315 series with enhanced ESD and transient immunity.
STM6779VWB6F 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:
- 2
- Voltage - Threshold:
- 1.575V, Adj
- Output:
- Open Drain or Open Collector
- 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
STM6779VWB6F FAQ
1.How can I place an order for STM6779VWB6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM6779VWB6F 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 STM6779VWB6F reliable?
The price and inventory of STM6779VWB6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM6779VWB6F is usually 5 days.
3.What payment methods are accepted for STM6779VWB6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM6779VWB6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM6779VWB6F?
STM6779VWB6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM6779VWB6F 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 STM6779VWB6F?
For technical support, including STM6779VWB6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM6779VWB6F requirements.
6.How does Aetrix verify that STM6779VWB6F is sourced from the original manufacturer or authorized distributors?
All STM6779VWB6F 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 STM6779VWB6F meets industry standards.
7.What is the process for return or replacement of STM6779VWB6F?
All STM6779VWB6F units undergo pre-shipment inspection (PSI). If there is an issue with STM6779VWB6F, 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 STM6779VWB6F part is unused and in its original packaging.
Return procedure for STM6779VWB6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM6779VWB6F Tags
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MIC826SYMT-TR
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