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STMicroelectronics STM6780SWB6F
- Part No.:
- STM6780SWB6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
STM6780SWB6F.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,191
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Product details
Overview
STM6780SWB6F from STMicroelectronics is a triple ultra-low-voltage supervisor IC with push-button reset, primary (VCC1) and secondary (VCC2) supply monitoring, and externally adjustable tertiary reset threshold via RSTIN pin. It features active-low push-pull RST output, manual reset (MR), delayed manual reset (MRC), 13.2/210/900 ms power-up reset delay options, and guaranteed RST state down to VCC1 or VCC2 ≥ 0.8 V. Used in battery-powered embedded systems requiring robust multi-rail power sequencing and reliable cold-start reset.
For engineers reviewing the STM6780SWB6F datasheet, STM6780SWB6F pinout, STM6780SWB6F application, or STM6780SWB6F equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts - all grounded in ST's official Doc ID 11469 Rev 8 specification.
Technical Context
The STM6780 implements a triple-supply monitoring architecture: VCC1 (primary, factory-trimmed thresholds from 4.63 V to 1.58 V), VCC2 (secondary, 3.08 V to 0.79 V), and RSTIN (tertiary, referenced to 0.626 V internal bandgap). Reset assertion occurs if any monitored voltage falls below its threshold or MR is pulled low.
It integrates a programmable manual reset delay via external capacitor on MRC pin (6 µs minimum, up to ~4 s with 3.3 µF), push-pull RST output referenced to VCC1, and guaranteed reset validity at VCC1/VCC2 ≥ 0.8 V - enabling reliable operation during brown-out and deep-undervoltage conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold Range | Factory-programmed 4.63 V to 1.58 V - enables precise reset point selection for main system rail (e.g., 3.3 V, 2.5 V, 1.8 V). |
| VCC2 Threshold Range | Factory-programmed 3.08 V to 0.79 V - supports monitoring of auxiliary rails like I/O or analog supplies. |
| RSTIN Reference Voltage | 0.626 V internal reference - allows user-defined reset threshold for third rail using resistor divider (e.g., 1.2 V, 1.0 V, 0.9 V). |
| 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 always-on battery-backed systems. |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial-grade embedded applications including networking and portable equipment. |
| RST Output Type | Active-low push-pull - eliminates need for external pull-up; drives low directly to VSS, compatible with most microcontroller reset inputs. |
Pinout & Package
SOT23-6 (WB) package: 6-pin surface-mount, 1.3 mm × 2.9 mm footprint, 1.45 mm height, lead pitch 0.95 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low push-pull reset output | Drives low when VCC1/VCC2/RSTIN drops below threshold or MR is asserted; remains low for trec after recovery. |
| 2 - VCC1 | Primary supply voltage input | Main power rail monitor input; also powers internal logic and defines RST output reference. |
| 3 - MRC | Manual reset delay capacitor input | Connects to VSS via external capacitor to delay MR-initiated reset (6 µs to >1 s); unused pins must be left open. |
| 4 - MR | Push-button reset input | Active-low input with 50 kΩ internal pull-up; debounced by design; initiates reset on falling edge. |
| 5 - RSTIN | Adjustable reset comparator input | High-impedance input referenced to 0.626 V; sets third reset threshold via external resistor divider. |
| 6 - VSS | Ground reference | System ground return for all internal comparators, logic, and RST output sink path. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent supply monitoring | Simultaneous supervision of VCC1 (main rail), VCC2 (auxiliary rail), and RSTIN (user-defined rail) - eliminates need for multiple discrete supervisors. |
| Factory-configurable reset thresholds | VCC1 and VCC2 thresholds laser-trimmed at wafer level - ensures ±1.5% accuracy without external components or calibration. |
| Programmable manual reset delay | MRC pin accepts external capacitor (0.001–10 µF) to delay reset assertion after button press - prevents spurious resets from mechanical bounce or noise. |
| Guaranteed reset validity at low VCC | RST output state is valid and controlled down to VCC1 or VCC2 ≥ 0.8 V - enables safe reset hold during deep brown-out or battery discharge. |
| Ultra-low quiescent current | 11 µA typical supply current - extends battery life in always-on supervisory circuits (e.g., RTC backup, wake-up monitors). |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered wearable ECG sensor with dual-rail power (3.3 V MCU + 1.8 V ADC) and cold-start reliability requirement. IC Role / Device Role / Timing Role: Monitors VCC1 (3.3 V), VCC2 (1.8 V), and RSTIN (1.2 V bias rail); asserts RST until both supplies stabilize and MR release delay completes. Use Value: Prevents firmware execution before ADC reference and digital core are fully powered; 11 µA current avoids draining coin-cell battery during standby. |
Use Scenario: DIN-rail mounted PLC module with isolated 24 V input, internal 5 V/3.3 V DC-DC converters, and watchdog-coupled reset. IC Role / Device Role / Timing Role: Supervises primary 5 V rail (VCC1), secondary 3.3 V logic rail (VCC2), and isolated 2.5 V analog reference (RSTIN); provides 210 ms trec to accommodate converter startup transients. Use Value: Ensures deterministic reset timing across wide temperature range (–40 °C to +85 °C); push-pull RST drives reset line without pull-up, simplifying layout in noisy industrial environments. |
| Set-Top Box Power Management | Wireless Gateway Baseband |
|
Use Scenario: Consumer STB with multi-voltage SoC (1.1 V core, 1.8 V memory, 3.3 V peripherals) and front-panel reset button. IC Role / Device Role / Timing Role: Uses VCC1 (3.3 V), VCC2 (1.8 V), RSTIN (1.1 V via divider), MR for front-panel button, and MRC for 100 ms debounce delay. Use Value: Eliminates need for three separate reset ICs; factory-trimmed thresholds avoid BOM cost and board space of external resistors; SOT23-6 fits tight PCB layouts. |
Use Scenario: LTE gateway with baseband processor requiring synchronized reset across 1.2 V core, 1.8 V I/O, and 3.0 V RF supply rails. IC Role / Device Role / Timing Role: Configured with VCC1 = 3.0 V (RF), VCC2 = 1.8 V (I/O), RSTIN = 1.2 V (core); uses 900 ms trec to cover slowest rail ramp-up. Use Value: Guarantees all rails exceed reset thresholds before releasing reset - prevents partial initialization and bus lockup; MRC pin enables clean software-triggered reset via GPIO-controlled capacitor discharge. |
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 supervisor (VDD only); no VCC2 or RSTIN inputs; fixed 3.3 V threshold; no MRC pin. | Only monitors one rail; requires additional ICs for multi-rail systems; lacks adjustable third threshold. | Select when only main rail supervision is needed and board space permits multiple devices. |
| MAX6816EUT+T | Single-channel push-button debouncer (no voltage monitoring); no VCC1/VCC2/RSTIN comparators; only MR-to-RST delay function. | Provides only manual reset conditioning - zero power-supply supervision capability. | Choose only for pure hardware reset button debouncing where voltage monitoring is handled elsewhere. |
Compared with TPS3808G33DBVR and MAX6816EUT+T, the STM6780SWB6F uniquely integrates triple-rail monitoring, factory-trimmed thresholds, and programmable MRC delay in one SOT23-6 package - reducing component count, BOM cost, and PCB area while delivering higher system-level reliability.
Availability
STM6780SWB6F is available at Aetrix Electronics and suitable for industrial PLC modules, portable medical sensors, set-top boxes, and wireless gateways requiring stable component supply, long-term lifecycle support, and guaranteed factory-trimmed performance.
Supply support for STM6780SWB6F 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.
The STM67xx family is part of ST's precision power-monitoring portfolio, engineered specifically for ultra-low-power, multi-rail embedded systems where deterministic reset behavior and minimal quiescent current are critical design requirements.
FAQ
What is the function of the MRC pin on STM6780SWB6F?
The MRC (Manual Reset Capacitor) pin enables user-programmable delay of the manual reset assertion. When an external capacitor is connected between MRC and VSS, pressing the MR button initiates reset only after the capacitor charges to threshold - providing hardware-based debounce from 6 µs to several seconds. Leaving MRC unconnected disables delay functionality.
Can STM6780SWB6F monitor a 1.2 V supply as the third rail?
Yes. Using the RSTIN pin with the internal 0.626 V reference, a resistor divider (e.g., R1 = 100 kΩ, R2 = 100 kΩ) sets the trip point to 1.252 V. The device asserts RST when the divided voltage at RSTIN falls below 0.626 V - corresponding to the 1.2 V rail dropping below its threshold. This configuration is explicitly validated in ST's application diagrams.
Is the RST output truly push-pull, and does it require a pull-up resistor?
Yes, STM6780SWB6F features an active-low push-pull RST output referenced to VCC1. It actively drives low and high - no external pull-up is required. This differs from open-drain variants (e.g., STM6779) and ensures full logic-level compatibility with microcontrollers lacking internal pull-ups or requiring driven reset signals.
How does STM6780SWB6F ensure reset validity during brown-out conditions?
The device guarantees correct RST logic state (driven low or high) whenever VCC1 or VCC2 ≥ 0.8 V. Below that, internal circuitry holds RST in a known state via charge retention and hysteresis - preventing floating or metastable reset signals during undervoltage events. This behavior is characterized across –40 °C to +85 °C per ST's DC and AC parameter tables.
STM6780SWB6F 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:
- 2.925V, 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
STM6780SWB6F FAQ
1.How can I place an order for STM6780SWB6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM6780SWB6F 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 STM6780SWB6F reliable?
The price and inventory of STM6780SWB6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM6780SWB6F is usually 5 days.
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STM6780SWB6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM6780SWB6F 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 STM6780SWB6F?
For technical support, including STM6780SWB6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM6780SWB6F requirements.
6.How does Aetrix verify that STM6780SWB6F is sourced from the original manufacturer or authorized distributors?
All STM6780SWB6F 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 STM6780SWB6F meets industry standards.
7.What is the process for return or replacement of STM6780SWB6F?
All STM6780SWB6F units undergo pre-shipment inspection (PSI). If there is an issue with STM6780SWB6F, 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 STM6780SWB6F part is unused and in its original packaging.
Return procedure for STM6780SWB6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM6780SWB6F Tags
-
MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
Diodes Incorporated
-
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
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MCP111T-300E/TT
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MCP120T-315I/TT
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