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STMicroelectronics STM6777TWWB6F
- Part No.:
- STM6777TWWB6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
STM6777TWWB6F.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,513
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Product details
Overview
STM6777TWWB6F from STMicroelectronics is a dual ultra-low-voltage supervisor IC with push-button reset and optional delayed manual reset (MRC), monitoring VCC1 (factory-trimmed 1.58–4.63 V threshold) and VCC2 (0.79–3.08 V), delivering active-low open-drain RST output, 11 µA typical supply current at 3.6 V, and 13.2/210/900 ms power-up reset delays - used in battery-powered networking equipment for reliable microprocessor reset control.
For engineers reviewing the STM6777TWWB6F datasheet, STM6777TWWB6F pinout, STM6777TWWB6F application, or STM6777TWWB6F equivalent, key selection criteria include dual-supply monitoring tolerance, MRC capacitor-based delay configurability, guaranteed RST state down to 0.8 V VCC1/VCC2, and SOT23-6 open-drain output compatibility with bi-directional processor reset pins.
Technical Context
The device implements independent voltage comparators for VCC1 and VCC2 against factory-trimmed thresholds, plus an external RSTIN comparator 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 after all supplies recover and MR returns high; MRC enables user-configurable manual reset delay via external capacitor (6 µs minimum, up to ~4 s with 3.3 µF), while RST remains valid as long as VCC1 or VCC2 ≥ 0.8 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | Factory-programmed 1.58 V to 4.63 V - sets primary supply brown-out detection point for microcontroller core voltage |
| VCC2 Threshold | Factory-programmed 0.79 V to 3.08 V - enables secondary supply (e.g., I/O or analog rail) monitoring |
| RST Output Type | Active-low open-drain - requires external pull-up to VCC1; compatible with bi-directional processor reset I/O |
| Supply Current | 11 µA typ at VCC1 = VCC2 = 3.6 V - supports multi-year operation in coin-cell–powered IoT edge nodes |
| Reset Delay (trec) | 13.2 / 210 / 900 ms (typ) - ensures stable power sequencing before processor release |
| Operating Temp | –40 °C to +85 °C - qualified for industrial-grade embedded systems including set-top boxes and portable comms |
| MRC Delay Range | 6 µs minimum to >1 s (capacitor-dependent) - prevents spurious resets from mechanical switch bounce or EMI transients |
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 system reset line low during fault; requires external pull-up (e.g., 10 kΩ to VCC1) |
| 2: VCC1 | Primary supply voltage input | Power source and reference for internal comparators and RST pull-up; monitors core logic rail |
| 3: VCC2 | Secondary supply voltage input | Enables independent monitoring of auxiliary rail (e.g., USB PHY or memory I/O voltage) |
| 4: MR | Push-button reset input | Active-low manual reset with 50 kΩ internal pull-up; debounced by design, no external RC needed |
| 5: VSS | Ground reference | Common return path for all internal circuits and external pull-up resistors |
| 6: MRC | Manual reset delay capacitor terminal | Connects to VSS via timing capacitor to extend MR-initiated reset hold time beyond trec |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-threshold voltage monitoring | Independent VCC1 and VCC2 comparators with factory-trimmed thresholds eliminate external resistor dividers |
| Configurable manual reset delay | MRC pin supports capacitor-based delay tuning from microseconds to seconds - replaces discrete timer circuits |
| Guaranteed RST validity at low VCC | RST state defined and functional even when VCC1 or VCC2 drops to 0.8 V - critical for graceful shutdown sequencing |
| Low quiescent current | 11 µA typical supply draw extends battery life in always-on remote sensors and portable gateways |
| Open-drain RST with bi-directional compatibility | Enables direct interface to processors with shared reset I/O pins without contention or level-shifting |
Applications
| Industrial PLC I/O Module | Portable Medical Monitor |
|---|---|
Use Scenario: Monitors 3.3 V microcontroller core and 2.5 V sensor interface rails in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Dual-supply supervisor ensuring deterministic reset during brown-out on either rail, with MRC delaying operator-initiated reset until firmware confirms safe state. Use Value: Prevents partial initialization and register corruption during unstable AC/DC converter recovery. | Use Scenario: Powers on/off sequence control in handheld ECG units using single-cell Li-ion (2.8–4.2 V) and regulated 1.8 V analog front-end. IC Role / Device Role / Timing Role: VCC1 monitors battery voltage; VCC2 tracks LDO output; RST holds MCU in reset until both stabilize post-power-on. Use Value: Eliminates boot failures caused by slow-rising analog supply relative to digital core. |
| Home Gateway Router | Smart Energy Meter |
Use Scenario: Supervises 5 V PoE-derived main rail and 3.3 V Wi-Fi SoC supply in residential broadband gateways. IC Role / Device Role / Timing Role: Detects VCC1 sag during surge events and asserts RST; MR+MRC allows field technician to force controlled reboot without cycling mains. Use Value: Reduces mean time to repair (MTTR) by enabling remote-reset-capable hardware design. | Use Scenario: Ensures reliable startup of metrology ASIC and secure element in tamper-resistant electricity meters. IC Role / Device Role / Timing Role: Monitors backup supercap (VCC1) and main SMPS (VCC2); RSTIN option (not used here) reserved for future analog sensor rail monitoring. Use Value: Meets IEC 62056-6-2 reset integrity requirements under rapid AC dropout conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT46D3+ | Single-supply monitor (VCC only), no VCC2 input or MRC pin; 4.63 V fixed threshold only | Lacks secondary rail supervision and manual reset delay - suitable only for simpler single-rail systems | Select when cost sensitivity outweighs need for dual-rail monitoring or field-serviceable reset delay |
| TPS3808G12DBVR | Single VDD input, adjustable threshold via external resistor divider; no MRC or VCC2 monitoring | Requires external components for threshold setting; no native support for auxiliary supply tracking | Choose when design flexibility for custom reset voltage is prioritized over integration and low component count |
Compared with MAX6326UT46D3+ and TPS3808G12DBVR, STM6777TWWB6F uniquely integrates dual fixed-threshold monitoring, open-drain bi-directional RST, and capacitor-tunable manual reset delay in one SOT23-6 package - reducing BOM count and PCB area in space-constrained industrial and portable designs.
Availability
STM6777TWWB6F is available at Aetrix Electronics and suitable for industrial automation controllers, portable medical instrumentation, home networking gateways, and smart metering systems requiring stable component supply across extended product lifecycles.
Supply support for STM6777TWWB6F 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 products for industrial, automotive, and consumer markets.
STM67xx supervisors belong to ST's precision voltage monitoring portfolio, engineered specifically for robust, low-power reset control in battery-operated and multi-rail embedded systems where reliability under voltage transients is critical.
FAQ
What is the function of the MRC pin on STM6777TWWB6F?
The MRC (Manual Reset Delay) pin accepts an external capacitor connected to VSS to extend the duration of the MR-initiated reset pulse beyond the standard trec delay. With a 3.3 µF capacitor, it achieves ~4 s delay; minimum delay is 6 µs when left unconnected. This eliminates need for external monostable timers in field-serviceable equipment.
Can STM6777TWWB6F monitor three supply rails?
No - STM6777TWWB6F monitors two dedicated rails (VCC1 and VCC2) with factory-trimmed thresholds. While RSTIN is present on other variants (e.g., STM6779/80), STM6777/78 lack RSTIN; therefore only dual-rail supervision is supported. For triple-rail monitoring, STM6779TWWB6F must be selected.
Is an external pull-up resistor required for the RST output?
Yes - because STM6777TWWB6F features an active-low open-drain RST output, an external pull-up resistor to VCC1 is mandatory. ST recommends a 10 kΩ resistor for most applications; value may be adjusted based on bus capacitance and rise-time requirements, but must avoid loading the output when VCC1 is near reset threshold.
What is the minimum operating voltage for guaranteed RST functionality?
The RST output state is guaranteed when VCC1 or VCC2 ≥ 0.8 V. Below this, output behavior is undefined. This specification ensures reliable reset assertion during brown-out conditions common in battery discharge profiles and unregulated DC inputs, supporting fail-safe shutdown in portable and energy-harvesting systems.
STM6777TWWB6F 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:
- 1.665V, 3.075V
- 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
STM6777TWWB6F FAQ
1.How can I place an order for STM6777TWWB6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM6777TWWB6F 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 STM6777TWWB6F reliable?
The price and inventory of STM6777TWWB6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM6777TWWB6F is usually 5 days.
3.What payment methods are accepted for STM6777TWWB6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM6777TWWB6F transactions.
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4.How is shipping managed for STM6777TWWB6F?
STM6777TWWB6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM6777TWWB6F 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 STM6777TWWB6F?
For technical support, including STM6777TWWB6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM6777TWWB6F requirements.
6.How does Aetrix verify that STM6777TWWB6F is sourced from the original manufacturer or authorized distributors?
All STM6777TWWB6F 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 STM6777TWWB6F meets industry standards.
7.What is the process for return or replacement of STM6777TWWB6F?
All STM6777TWWB6F units undergo pre-shipment inspection (PSI). If there is an issue with STM6777TWWB6F, 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 STM6777TWWB6F part is unused and in its original packaging.
Return procedure for STM6777TWWB6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM6777TWWB6F 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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MCP130T-315I/TT
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