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STMicroelectronics STM6778SYWB6F
- Part No.:
- STM6778SYWB6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
STM6778SYWB6F.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,919
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Product details
Overview
STM6778SYWB6F from STMicroelectronics is a dual ultra-low voltage supervisor IC with push-button reset and optional delayed manual reset (MRC), monitoring VCC1 (factory-trimmed threshold) and VCC2 (factory-trimmed threshold), featuring active-low push-pull RST output, 13.2/210/900 ms reset delay options, and 11 µA typical supply current at 3.6 V. It operates from –40 °C to +85 °C and is used in battery-powered portable systems and networking equipment for reliable power-on and fault-triggered reset control.
For engineers reviewing the STM6778SYWB6F datasheet, STM6778SYWB6F pinout, STM6778SYWB6F application, or STM6778SYWB6F equivalent, key selection criteria include dual-supply monitoring capability, MRC-enabled manual reset delay flexibility, guaranteed RST state down to 0.8 V VCC1/VCC2, and SOT23-6 package compatibility with space-constrained embedded designs.
Technical Context
The device implements independent comparator-based monitoring of two supply rails (VCC1 and VCC2) against factory-programmed thresholds (e.g., 4.63 V–1.58 V for VCC1; 3.08 V–0.79 V for VCC2), with reset assertion triggered if either falls below its threshold or MR is pulled low. The MRC pin enables user-configurable delay (≥6 µs) on manual reset initiation via external capacitor.
Reset output (RST) is active-low push-pull, referenced to VCC1, and guaranteed functional when VCC1 or VCC2 ≥ 0.8 V. The internal logic ensures RST remains asserted for trec (13.2/210/900 ms typ) after all monitored supplies recover and MR returns high - no external timing components required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | Factory-programmed 4.63 V to 1.58 V; sets primary supply fail-detection point without external components. |
| VCC2 Threshold | Factory-programmed 3.08 V to 0.79 V; enables secondary rail supervision for multi-rail SoC or PMIC systems. |
| Reset Delay (trec) | 13.2 ms / 210 ms / 900 ms (typ); fixed internal timing ensures deterministic power-up sequencing. |
| Supply Current | 11 µA (typ) at VCC1 = VCC2 = 3.6 V; supports long battery life in always-on supervisory applications. |
| Operating Temp | –40 °C to +85 °C; qualified for industrial-grade embedded systems including set-top boxes and portable comms. |
| RST Output Type | Active-low push-pull; drives reset line directly without external pull-up, simplifying PCB layout. |
| MRC Function | Capacitor-programmable manual reset delay (≥6 µs); prevents spurious resets during button press bounce or ESD events. |
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 push-pull reset output | Drives processor reset line low during fault or manual trigger; sinks/source current without external components. |
| 2: VCC1 | Primary supply voltage input | Power source and reference for RST output and VCC1 monitor; determines minimum operating voltage (≥0.8 V). |
| 3: VCC2 | Secondary supply voltage input | Enables independent monitoring of auxiliary rail (e.g., I/O or analog supply); threshold factory-set. |
| 4: MR | Push-button reset input | Active-low manual reset with internal 50 kΩ pull-up; debounced by design, no external RC needed. |
| 5: MRC | Manual reset delay input | Accepts external capacitor to delay RST assertion after MR activation; supports robust human-interface timing. |
| 6: VSS | Ground reference | Common return path for all internal comparators, logic, and RST driver; must be low-impedance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent supply monitoring | Simultaneous VCC1 and VCC2 supervision with separate factory-trimmed thresholds avoids single-point failure in multi-rail systems. |
| Guaranteed RST state at low VCC | RST logic level is valid and stable when VCC1 or VCC2 ≥ 0.8 V - critical for brownout detection before full power-up. |
| Three selectable reset timeout periods | 13.2 ms / 210 ms / 900 ms typ trec options accommodate diverse processor boot requirements without external timing elements. |
| Capacitor-programmable manual reset delay | MRC pin allows precise delay tuning (≥6 µs) to suppress mechanical switch bounce or transient noise on MR line. |
| Ultra-low quiescent current | 11 µA typical ICC enables >10-year battery life in coin-cell-powered IoT edge nodes requiring persistent supervision. |
Applications
| Portable Medical Monitor | Industrial Gateway Controller |
|---|---|
Use Scenario: Battery-powered handheld vital sign monitor with dual-core MCU and analog sensor front-end. IC Role / Device Role / Timing Role: Supervises main 3.3 V system rail (VCC1) and 1.8 V sensor interface rail (VCC2); asserts RST on undervoltage or user-initiated reset. Use Value: Ensures clean MCU reset before firmware execution, preventing corrupted ADC sampling or memory initialization during battery sag. | Use Scenario: DIN-rail mounted Ethernet-to-Modbus gateway with isolated power domains and watchdog-critical operation. IC Role / Device Role / Timing Role: Monitors 5 V primary DC/DC output (VCC1) and 3.3 V isolated logic rail (VCC2); provides 210 ms trec to align with FPGA configuration time. Use Value: Prevents partial boot of communication stack due to transient rail dip, ensuring deterministic network recovery after power interruption. |
| Set-Top Box Power Management | Wireless Audio Transceiver |
Use Scenario: Consumer STB with multi-voltage SoC (core, I/O, memory), standby-to-wake transition, and IR remote reset. IC Role / Device Role / Timing Role: Tracks 1.2 V core rail (VCC1) and 3.3 V HDMI/USB rail (VCC2); uses MRC pin to delay reset during IR command processing. Use Value: Eliminates false resets caused by brief IR receiver current surges, improving remote responsiveness without sacrificing reliability. | Use Scenario: Bluetooth LE audio dongle powered by single-cell Li-ion, requiring low-power supervision during sleep/wake cycles. IC Role / Device Role / Timing Role: Supervises 3.0 V LDO output (VCC1) and 1.2 V RF synthesizer rail (VCC2); leverages 13.2 ms trec for fast wake-from-sleep recovery. Use Value: Reduces wake latency while maintaining sub-µA average current draw - extending playback time between charges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM6777SYWB6F | Identical pinout and function but features open-drain RST output instead of push-pull. | Requires external pull-up resistor; suitable where bidirectional reset bus sharing is needed. | Select when interfacing with processors requiring open-drain reset arbitration or shared reset busses. |
| TPS3808G33DBVR | Single-supply supervisor (VDD only); no VCC2 input or MRC pin; 3.3 V fixed threshold; 200 ms trec. | Lacks dual-rail monitoring and programmable manual reset delay; simpler BOM but reduced supervision scope. | Choose for cost-sensitive single-rail applications where secondary rail monitoring is unnecessary. |
Compared with STM6777SYWB6F, STM6778SYWB6F eliminates external pull-up needs and simplifies layout; versus TPS3808G33DBVR, it adds critical dual-rail coverage and MRC-based noise immunity - essential for complex, battery-operated systems.
Availability
STM6778SYWB6F is available at Aetrix Electronics and suitable for portable medical monitors, industrial gateways, set-top box power management, and wireless audio transceivers requiring stable component supply across extended production lifecycles.
Supply support for STM6778SYWB6F 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, dual-supply supervision in space- and energy-constrained embedded systems - emphasizing factory-trimmed accuracy, guaranteed low-VCC operation, and integrated push-button reset functionality.
FAQ
What is the minimum operating voltage for reliable reset assertion?
STM6778SYWB6F guarantees correct RST logic state when VCC1 or VCC2 is ≥ 0.8 V. Below this, reset behavior is not specified. This enables brownout detection well before complete power collapse, supporting graceful shutdown in battery-powered systems.
How does the MRC pin affect manual reset timing?
The MRC pin accepts an external capacitor to delay RST assertion after MR activation. With a 3.3 µF capacitor, typical delay is ~4 s; smaller values yield shorter delays (≥6 µs minimum). No delay occurs if MRC is left unconnected - MR triggers RST immediately.
Can STM6778SYWB6F monitor a 1.2 V supply as VCC2?
Yes. VCC2 threshold is factory-programmed within 3.08 V to 0.79 V range, covering 1.2 V. ST's ordering code specifies the exact threshold (e.g., "Y" suffix denotes 1.2 V option); confirm via ST's part numbering scheme or datasheet Table 1.
Is an external pull-up required on the RST pin?
No. STM6778SYWB6F features active-low push-pull RST output, which actively drives low and high states. Unlike open-drain variants (e.g., STM6777), it requires no external pull-up resistor - reducing BOM count and PCB area.
STM6778SYWB6F 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:
- 2.188V, 2.925V
- 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
STM6778SYWB6F FAQ
1.How can I place an order for STM6778SYWB6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM6778SYWB6F 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 STM6778SYWB6F reliable?
The price and inventory of STM6778SYWB6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM6778SYWB6F is usually 5 days.
3.What payment methods are accepted for STM6778SYWB6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM6778SYWB6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM6778SYWB6F?
STM6778SYWB6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM6778SYWB6F 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 STM6778SYWB6F?
For technical support, including STM6778SYWB6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM6778SYWB6F requirements.
6.How does Aetrix verify that STM6778SYWB6F is sourced from the original manufacturer or authorized distributors?
All STM6778SYWB6F 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 STM6778SYWB6F meets industry standards.
7.What is the process for return or replacement of STM6778SYWB6F?
All STM6778SYWB6F units undergo pre-shipment inspection (PSI). If there is an issue with STM6778SYWB6F, 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 STM6778SYWB6F part is unused and in its original packaging.
Return procedure for STM6778SYWB6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM6778SYWB6F Tags
-
MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
Diodes Incorporated
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APX803L20-29SA-7
Diodes Incorporated
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TPS3828-33DBVR
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V6340RSP3B+
EM Microelectronic
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EM6325CXSP5B-2.9+
EM Microelectronic
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MCP120T-300I/TT
Microchip Technology
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MCP130T-315I/TT
Microchip Technology
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MCP120T-475I/TT
Microchip Technology
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MCP111T-300E/TT
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MCP120T-315I/TT
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MCP809T-315I/TT
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