My Inquiry
My Account
STMicroelectronics STM6780TWB6F
- Part No.:
- STM6780TWB6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
STM6780TWB6F.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:7,136
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
STM6780TWB6F from STMicroelectronics is a triple ultra-low-voltage supervisor IC with push-button reset, monitoring VCC1 (primary), VCC2 (secondary), and RSTIN (externally adjustable tertiary supply) with factory-trimmed thresholds of 4.63 V / 3.08 V and 0.626 V internal reference, respectively; features active-low push-pull RST output, manual reset (MR), delayed manual reset (MRC), and 13.2 ms / 210 ms / 900 ms selectable power-up reset delay; used in battery-powered networking equipment for reliable power-on sequencing and brownout protection.
For engineers reviewing the STM6780TWB6F datasheet, STM6780TWB6F pinout, STM6780TWB6F application, or STM6780TWB6F equivalent, key selection criteria include triple-supply monitoring capability, MRC-based manual reset delay tuning, guaranteed RST state down to VCC1/VCC2 ≥ 0.8 V, and SOT23-6 package compatibility with space-constrained embedded designs.
Technical Context
The device implements three independent voltage comparators: one for VCC1 (factory-programmed threshold 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 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 ms / 210 ms / 900 ms typ) after all supplies exceed thresholds and MR returns high; MRC enables external capacitor-controlled delay (≥6 µs) on manual reset initiation, with push-pull RST output referenced to VCC1 and guaranteed logic state at VCC1/VCC2 ≥ 0.8 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | Factory-programmed 4.63 V - ensures clean reset assertion during 5 V rail brownout |
| VCC2 Threshold | Factory-programmed 3.08 V - matches standard 3.3 V supply tolerance for secondary rail monitoring |
| RSTIN Reference | 0.626 V internal - enables precise adjustment of third-rail reset threshold via resistor divider |
| Reset Delay (trec) | 900 ms typical - provides extended hold time for complex processor initialization sequences |
| Supply Current | 11 µA typical at 3.6 V - minimizes quiescent drain in always-on battery-backed systems |
| Operating Temp | –40 °C to +85 °C - supports industrial-grade reliability in uncontrolled ambient environments |
| RST Output Type | Active-low push-pull - eliminates need for external pull-up and ensures defined state at VCC ≥ 0.8 V |
Pinout & Package
SOT23-6 (WB) package - 6-pin surface-mount small outline transistor housing with standard footprint and thermal profile for reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RST | Active-low push-pull reset output | Drives low when any monitored supply fails or MR is asserted; remains low for trec after recovery; referenced to VCC1 |
| 2: VCC1 | Primary supply voltage input | Monitored by main comparator; powers internal circuitry and defines RST output reference |
| 3: MRC | Manual reset delay input | Accepts external capacitor to delay MR-triggered reset assertion (≥6 µs); open = minimal delay |
| 4: MR | Push-button reset input | Active-low; internal 50 kΩ pull-up to VCC1; debounced by design; initiates reset on falling edge |
| 5: RSTIN | Adjustable reset comparator input | High-impedance node compared against 0.626 V reference; sets third-rail threshold via external resistor divider |
| 6: VSS | Ground reference | Common return path for all internal comparators, logic, and output stage |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring | Simultaneous VCC1, VCC2, and RSTIN supervision enables full-system power integrity verification |
| Selectable trec delay | 900 ms typ delay ensures robust reset hold time for multi-phase bootloaders and FPGA configuration |
| MRC programmable delay | Capacitor-tuned manual reset delay prevents spurious resets from mechanical switch bounce or ESD transients |
| Guaranteed RST state | Valid logic level maintained at RST output even when VCC1 or VCC2 drops to 0.8 V - critical for graceful shutdown |
| Ultra-low ICC | 11 µA typical supply current extends battery life in portable and remote sensor applications |
Applications
| Set-Top Box Power Sequencing | Industrial IoT Gateway |
|---|---|
Use Scenario: Coordinated startup of SoC, memory, and peripheral rails in cable/satellite STBs with multiple DC/DC converters. IC Role / Device Role / Timing Role: Triple-supply supervisor ensuring VCC1 (5 V), VCC2 (3.3 V), and RSTIN (1.8 V core) all meet thresholds before releasing processor reset. Use Value: Prevents firmware corruption by enforcing minimum 900 ms reset hold time until all rails stabilize under load. | Use Scenario: Remote edge gateway operating on Li-ion backup with intermittent mains power and wide temperature swings. IC Role / Device Role / Timing Role: Monitors primary 3.3 V system rail (VCC1), secondary 5 V PoE interface rail (VCC2), and 1.2 V FPGA core (RSTIN). Use Value: 11 µA ICC and –40 °C to +85 °C rating enable years of maintenance-free operation in outdoor enclosures. |
| Battery-Powered Network Analyzer | Medical Portable Monitor |
Use Scenario: Handheld spectrum analyzer requiring deterministic wake-from-sleep and rapid power-cycle recovery. IC Role / Device Role / Timing Role: Uses MRC pin with 3.3 µF capacitor to add ~4 s delay to manual reset, preventing accidental reboot during field use. Use Value: Eliminates need for external RC timing circuit while enabling user-intent confirmation before reset initiation. | Use Scenario: Clinical-grade patient monitor with dual power sources (AC adapter + internal LiPo) and strict IEC 60601-1 safety requirements. IC Role / Device Role / Timing Role: Supervises 5 V AC-derived rail (VCC1), 3.3 V isolated logic rail (VCC2), and 2.5 V analog front-end rail (RSTIN). Use Value: Push-pull RST guarantees known state down to 0.8 V - ensures safe shutdown sequence even during rapid AC loss events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM6779TWB6F | Identical pinout and triple-monitoring function but with open-drain RST output instead of push-pull | Requires external 10 kΩ pull-up to VCC1; unsuitable where guaranteed low-state at VCC < 1.2 V is required | Select when interfacing to processors with bidirectional reset pins or when shared reset bus architecture is used |
| TPS3808G33DBVR | Single-supply supervisor (VDD only); no VCC2 or RSTIN inputs; fixed 3.3 V threshold; no MRC pin | Lacks tertiary monitoring and manual reset delay; limited to basic 3.3 V rail supervision | Choose only for cost-sensitive single-rail applications where triple monitoring is unnecessary |
Compared with STM6779TWB6F (open-drain) and TPS3808G33DBVR (single-rail), STM6780TWB6F uniquely delivers push-pull RST assurance down to 0.8 V plus MRC-tunable manual reset delay - essential for fail-safe operation in multi-rail, battery-critical systems.
Availability
STM6780TWB6F is available at Aetrix Electronics and suitable for set-top boxes, industrial IoT gateways, battery-powered analyzers, and medical portable monitors requiring stable component supply across long product lifecycles.
Supply support for STM6780TWB6F 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.
STM67xx is ST's ultra-low-voltage supervisor product line targeting space-constrained, battery-operated systems requiring precise multi-rail power monitoring and robust reset control with minimal quiescent current.
FAQ
What is the function of the MRC pin on STM6780TWB6F?
The MRC (Manual Reset Delay) pin accepts an external capacitor between MRC and VSS to introduce a user-defined delay (≥6 µs) between MR button press and RST assertion. With a 3.3 µF capacitor, typical delay is ~4 seconds. Leaving MRC open yields minimal delay (~6 µs). This prevents accidental resets and adds intentional user confirmation time.
Can STM6780TWB6F monitor a 1.2 V supply?
Yes - the RSTIN pin uses an internal 0.626 V reference, allowing precise monitoring of any supply via an external resistor divider. For a 1.2 V rail, use R1 = 909 kΩ and R2 = 1.2 MΩ to scale 1.2 V down to 0.626 V at RSTIN. The comparator triggers when the divided voltage falls below 0.626 V, corresponding to ~1.15 V at the rail.
Is the RST output truly push-pull, and why does that matter?
Yes - RST is a true push-pull driver referenced to VCC1, capable of actively driving high or low without external components. This guarantees a defined logic state even when VCC1 drops to 0.8 V, unlike open-drain outputs that float or require pull-ups. It eliminates risk of undefined reset states during brownout conditions critical in medical and industrial systems.
What are the factory-programmed reset thresholds for VCC1 and VCC2 on STM6780TWB6F?
Per STMicroelectronics' ordering code and datasheet Table 1, STM6780TWB6F has factory-programmed thresholds of 4.63 V for VCC1 and 3.08 V for VCC2. These values are laser-trimmed during production and cannot be altered. The "T" in the part number denotes 4.63 V VCC1 threshold; "W" indicates 3.08 V VCC2 threshold per ST's marking convention.
STM6780TWB6F 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:
- 3.075V, 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
STM6780TWB6F FAQ
1.How can I place an order for STM6780TWB6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM6780TWB6F 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 STM6780TWB6F reliable?
The price and inventory of STM6780TWB6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM6780TWB6F is usually 5 days.
3.What payment methods are accepted for STM6780TWB6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM6780TWB6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM6780TWB6F?
STM6780TWB6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM6780TWB6F 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 STM6780TWB6F?
For technical support, including STM6780TWB6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM6780TWB6F requirements.
6.How does Aetrix verify that STM6780TWB6F is sourced from the original manufacturer or authorized distributors?
All STM6780TWB6F 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 STM6780TWB6F meets industry standards.
7.What is the process for return or replacement of STM6780TWB6F?
All STM6780TWB6F units undergo pre-shipment inspection (PSI). If there is an issue with STM6780TWB6F, 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 STM6780TWB6F part is unused and in its original packaging.
Return procedure for STM6780TWB6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM6780TWB6F Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
