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STMicroelectronics STM6779LWB6F
- Part No.:
- STM6779LWB6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
STM6779LWB6F.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,250
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Product details
Overview
STM6779LWB6F from STMicroelectronics is a triple ultra-low-voltage supervisor IC with push-button reset and delayed manual reset capability. It monitors primary (VCC1), secondary (VCC2), and adjustable tertiary (RSTIN) supply rails, features open-drain active-low RST output, 13.2/210/900 ms power-up reset delay options, and operates from –40 °C to +85 °C. Used in battery-powered networking equipment for reliable power-on sequencing and brownout recovery.
For engineers reviewing the STM6779LWB6F datasheet, STM6779LWB6F pinout, STM6779LWB6F application, or STM6779LWB6F equivalent, key selection criteria include dual-supply monitoring thresholds (4.63 V–1.58 V on VCC1; 3.08 V–0.79 V on VCC2), 0.626 V internal reference for RSTIN, MRC-capable delayed manual reset, and SOT23-6 open-drain RST output compatibility with bi-directional processor reset pins.
Technical Context
The device implements three independent voltage comparators: one for VCC1 with factory-programmed threshold (e.g., 2.93 V), one for VCC2 (e.g., 2.63 V), and one for RSTIN referenced to a 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 delay (13.2/210/900 ms typ) after all supplies exceed thresholds and MR returns high. The MRC pin enables user-configurable manual reset delay via external capacitor, with minimum 6 µs delay when left open - supporting noise-immune push-button interfaces in portable systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | Factory-programmed 2.93 V ±1.5% - ensures reliable CPU core supply monitoring at 3.3 V nominal rail. |
| VCC2 Threshold | Factory-programmed 2.63 V ±1.5% - supports I/O supply supervision for 2.5 V or 2.8 V domains. |
| RSTIN Reference | 0.626 V internal reference - enables precise adjustment of third-rail reset threshold via resistor divider. |
| Reset Delay (trec) | 210 ms typical - provides sufficient hold time for FPGA configuration or flash boot sequence. |
| Supply Current | 11 µA typical at 3.6 V - minimizes quiescent drain in always-on battery backup circuits. |
| Operating Temp | –40 °C to +85 °C - qualified for industrial-grade embedded networking and set-top box applications. |
| RST Output Type | Active-low open drain - allows wired-OR reset bus sharing and compatibility with bidirectional processor reset pins. |
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 during fault or MR assertion; requires external pull-up to VCC1 (e.g., 10 kΩ); compatible with bidirectional processor reset I/O. |
| 2: VCC1 | Primary supply voltage input | Monitors main system rail (e.g., 3.3 V); powers internal circuitry and sets RST pull-up reference. |
| 3: MRC | Manual reset delay input | Accepts external capacitor to VSS; configures manual reset delay from 6 µs to >4 s (e.g., 3.3 µF → ~4 s). |
| 4: MR | Push-button reset input | Active-low with 50 kΩ internal pull-up; debounced by design; connects to momentary switch to VSS. |
| 5: RSTIN | Adjustable reset comparator input | High-impedance input referenced to 0.626 V; threshold set by external resistor divider for third supply (e.g., 1.2 V, 1.8 V). |
| 6: VSS | Ground reference | Common return path for VCC1, VCC2 (internal), and all comparators; must be low-impedance connection. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring | Simultaneous supervision of VCC1 (core), VCC2 (I/O), and RSTIN (auxiliary rail) prevents partial-power-up failures. |
| Configurable reset delay | Three factory-set trec options (13.2/210/900 ms) ensure timing alignment with diverse boot sequences (MCU, FPGA, DSP). |
| MRC-based manual reset delay | Capacitor-tuned delay eliminates need for external timer ICs or firmware debounce in handheld and remote-control interfaces. |
| Guaranteed RST state down to 0.8 V | Ensures valid reset assertion even during deep brownout - critical for nonvolatile memory write protection. |
| Low 11 µA quiescent current | Extends battery life in always-on supervisory functions (e.g., smart meter backup power, IoT sensor sleep mode). |
Applications
| Industrial Networking Gateway | Portable Medical Monitor |
|---|---|
Use Scenario: Monitors 3.3 V CPU core, 2.5 V PHY interface, and 1.2 V ADC reference rails during cold start and line transient events. IC Role / Device Role / Timing Role: Triple-rail supervisor enforcing synchronized reset release after all supplies stabilize; trec = 210 ms aligns with Ethernet PHY initialization. Use Value: Prevents packet corruption and PHY lockup by ensuring MAC and PHY reset simultaneously only after stable power. | Use Scenario: Supervises 3.0 V microcontroller, 2.8 V display driver, and 1.8 V sensor signal chain in battery-operated ECG unit. IC Role / Device Role / Timing Role: Provides fail-safe reset during battery voltage sag; MRC delays manual reset to avoid accidental reboots during clinical use. Use Value: Eliminates spurious restarts from button press bounce while maintaining <100 ms response to intentional reset. |
| Set-Top Box Power Management | Smart Home Hub Controller |
Use Scenario: Tracks 12 V DC/DC output, 3.3 V SoC rail, and 1.1 V DDR termination voltage across thermal cycling and load steps. IC Role / Device Role / Timing Role: Detects undervoltage on DDR termination rail (via RSTIN + divider) to prevent memory bus corruption before full boot. Use Value: Avoids uncorrectable memory errors during warm reboot by asserting reset before DDR controller initializes. | Use Scenario: Manages reset sequencing for Zigbee SoC (3.3 V), Wi-Fi module (3.0 V), and USB-C PD controller (5.0 V) in multi-rail hub design. IC Role / Device Role / Timing Role: Uses RSTIN to monitor USB-C VBUS presence as system enable signal; triggers controlled startup only when power is valid. Use Value: Enables safe hot-plug operation without firmware intervention - hardware-enforced dependency between power and subsystem enable. |
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 (3.3 V only); no VCC2 or RSTIN inputs; fixed 200 ms trec; push-pull RST output. | Lacks dual/third-rail monitoring; unsuitable for multi-rail brownout detection; requires external logic for multi-input reset arbitration. | Select only when supervising one rail and open-drain RST is not required. |
| MAX6816EUT+T | Single-channel push-button debouncer with 14 ms delay; no voltage monitoring; no RST output; 5-pin SOT23. | No supply supervision capability; serves only as MR input conditioner - must pair with separate supervisor IC. | Choose only as supplemental MR front-end, not as functional replacement for STM6779LWB6F. |
Compared with TPS3808G33DBVR and MAX6816EUT+T, STM6779LWB6F uniquely integrates triple-rail monitoring, open-drain RST, and capacitor-configurable MRC delay in a single SOT23-6 package - eliminating board space, BOM count, and timing coordination overhead in compact multi-rail systems.
Availability
STM6779LWB6F is available at Aetrix Electronics and suitable for industrial networking gateways, portable medical monitors, set-top boxes, and smart home hubs requiring stable component supply across extended temperature and multi-year production cycles.
Supply support for STM6779LWB6F 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 intelligent power, sensing, and control solutions for automotive, industrial, and consumer markets.
The STM67xx family targets ultra-low-power, multi-rail supervision in space-constrained, battery-sensitive applications - emphasizing factory-trimmed accuracy, guaranteed reset behavior below 0.8 V, and hardware-debounced push-button interfaces.
FAQ
What is the function of the MRC pin on STM6779LWB6F?
The MRC (Manual Reset Delay) pin accepts an external capacitor to ground, enabling user-defined delay between MR button press and RST assertion. With a 3.3 µF capacitor, delay is ~4 s; with no capacitor (open), minimum delay is 6 µs. This eliminates firmware debounce and supports noise-immune mechanical reset in portable devices.
Can STM6779LWB6F monitor a 1.2 V supply using RSTIN?
Yes. Using the 0.626 V internal reference, a resistor divider (e.g., R1 = 100 kΩ, R2 = 100 kΩ) on RSTIN sets threshold to 1.252 V. The comparator triggers RST when input drops below this value. Divider ratio must maintain ≥100 kΩ Thevenin impedance to avoid loading error per datasheet Section 1.1.7.
Why does STM6779LWB6F use open-drain RST instead of push-pull?
Open-drain RST enables wired-OR reset bus architectures where multiple supervisors or processors share one reset line. It avoids contention with bidirectional processor reset pins and allows flexible pull-up to any compatible voltage (e.g., VCC1 or higher rail), essential in mixed-voltage SoC designs.
Is STM6779LWB6F qualified for automotive applications?
No. STM6779LWB6F is specified for industrial temperature range (–40 °C to +85 °C) and lacks AEC-Q100 qualification. For automotive use, ST offers the pin-compatible STM6779MWY6F (SOT23-5) and STM6779MWY6F variants with extended temp range and automotive qualification - consult ST's automotive product selector for validated alternatives.
STM6779LWB6F 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:
- 4.625V, 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
STM6779LWB6F FAQ
1.How can I place an order for STM6779LWB6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM6779LWB6F 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 STM6779LWB6F reliable?
The price and inventory of STM6779LWB6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM6779LWB6F is usually 5 days.
3.What payment methods are accepted for STM6779LWB6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM6779LWB6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM6779LWB6F?
STM6779LWB6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM6779LWB6F 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 STM6779LWB6F?
For technical support, including STM6779LWB6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM6779LWB6F requirements.
6.How does Aetrix verify that STM6779LWB6F is sourced from the original manufacturer or authorized distributors?
All STM6779LWB6F 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 STM6779LWB6F meets industry standards.
7.What is the process for return or replacement of STM6779LWB6F?
All STM6779LWB6F units undergo pre-shipment inspection (PSI). If there is an issue with STM6779LWB6F, 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 STM6779LWB6F part is unused and in its original packaging.
Return procedure for STM6779LWB6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM6779LWB6F Tags
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MIC826SYMT-TR
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