My Inquiry
My Account
STMicroelectronics STM6825MWY6F
- Part No.:
- STM6825MWY6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
STM6825MWY6F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,766
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
STM6825MWY6F from STMicroelectronics is a 5-pin precision voltage supervisor IC with watchdog timer and manual reset input, designed for microprocessor reset management in industrial embedded systems. It monitors VCC at 3.3 V (±2.5%), asserts active-low push-pull RST for ≥1.4 ms, features 1.6 s watchdog timeout, and guarantees reset assertion down to VCC = 1.0 V. Used in power-up sequencing and fault recovery of MCU-based controllers.
For engineers reviewing the STM6825MWY6F datasheet, STM6825MWY6F pinout, STM6825MWY6F application, or STM6825MWY6F equivalent, this page delivers verified technical context, exact pin functions, real-world use scenarios, and validated alternative options - all grounded in ST's production datasheet DocID11110 Rev 14.
Technical Context
The STM6825MWY6F integrates a precision voltage reference and comparator to monitor VCC against a fixed 3.3 V threshold (±2.5%). Its reset logic asserts RST low on VCC undervoltage, MR low, or watchdog timeout - with guaranteed validity down to VCC = 1.0 V across –40 to +85 °C.
It implements a 1.6 s (typ.) watchdog timer cleared by WDI edge transitions; WDI can be left floating to disable watchdog functionality. The active-low push-pull RST output drives directly into MCU reset pins without external pull-ups, supporting immediate deassertion after trec (1.4 ms typ.) upon VCC recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | 3.3 V ±2.5% - precisely triggers reset during 3.3 V rail collapse, avoiding false resets near nominal supply. |
| RST Pulse Width | 1.4 ms (typ.) - meets minimum reset hold time for ARM Cortex-M and similar MCUs during power-up. |
| Watchdog Timeout | 1.6 s (typ.) - provides sufficient margin for firmware watchdog service loops without premature timeout. |
| Supply Current | 3 µA (typ., VCC < 3.6 V) - enables always-on supervision in battery-backed or ultra-low-power systems. |
| Operating Temp | –40 to +85 °C - certified for industrial-grade operation without derating in harsh ambient environments. |
| VCC Validity Limit | 1.0 V - ensures reliable reset assertion even during deep brown-out, preventing MCU lockup below 1.2 V core logic. |
| Reset Output Type | Active-low, push-pull - eliminates need for external pull-up resistor and supports direct connection to bidirectional MCU reset I/O. |
Pinout & Package
STM6825MWY6F is housed in a standard 5-pin SOT23-5 package (JEDEC MO-178AB), with 1.3 mm height, 2.9 mm × 1.6 mm footprint, and gull-wing leads compatible with automated PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: WDI | Watchdog input | Edge-sensitive input; toggling within 1.6 s prevents reset assertion; floating disables watchdog function. |
| 2: VCC | Power supply | Monitored 3.3 V rail input; device operates from 1.0–5.5 V but supervises only at 3.3 V threshold. |
| 3: VSS | Ground | Reference return path for internal comparator and output drivers; must be low-impedance. |
| 4: MR | Manual reset input | Active-low input with 52 kΩ internal pull-up; momentary GND short generates system reset without external components. |
| 5: RST | Active-low reset output | Push-pull driver capable of sinking 20 mA; asserts low during fault and holds for 1.4 ms after recovery. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.3 V monitoring | ±2.5% threshold accuracy over temperature ensures consistent reset activation across –40 to +85 °C. |
| Guaranteed reset at 1.0 V VCC | Enables fail-safe behavior during severe brown-out, preventing MCU execution from corrupted memory or registers. |
| Integrated watchdog timer | 1.6 s timeout with edge-triggered clear allows robust firmware health checking without external timing components. |
| MR with internal pull-up | 52 kΩ on-chip pull-up eliminates external resistor for push-button reset, reducing BOM count and board space. |
| Low 3 µA quiescent current | Supports permanent supervision in energy-constrained applications such as smart sensors and battery-powered gateways. |
Applications
| Industrial PLC Controller | Smart Energy Meter |
|---|---|
Use Scenario: Power cycling due to grid fluctuations causes MCU reset instability during firmware update. IC Role / Device Role / Timing Role: Supervisor asserts RST during VCC dip below 3.3 V and holds for 1.4 ms to guarantee clean MCU restart. Use Value: Prevents partial flash writes and register corruption by enforcing minimum reset pulse width and brown-out detection down to 1.0 V. |
Use Scenario: Long-term battery backup requires continuous supervision with minimal leakage current. IC Role / Device Role / Timing Role: STM6825MWY6F monitors main 3.3 V rail while drawing only 3 µA, enabling >10-year coin-cell life. Use Value: Eliminates need for external LDO or discrete reset circuit, reducing bill-of-materials and PCB area in sealed meter housing. |
| Automotive Body Control Module | IoT Edge Gateway |
Use Scenario: Load dump transients cause temporary VCC sag, risking MCU hang during CAN message processing. IC Role / Device Role / Timing Role: Detects sub-threshold VCC events and asserts push-pull RST to force controlled reboot before CAN bus lockup. Use Value: Push-pull output avoids reliance on external pull-up, ensuring deterministic reset timing under noisy 12 V system conditions. |
Use Scenario: Firmware watchdog must recover from infinite loops in wireless stack without host intervention. IC Role / Device Role / Timing Role: WDI pin receives periodic GPIO toggles; failure to toggle within 1.6 s triggers hardware reset via RST. Use Value: Hardware-enforced recovery bypasses software-level hangs, restoring network connectivity without manual reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor with watchdog applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM6823MWY6F | Same 3.3 V threshold and SOT23-5 package, but features open-drain RST output requiring external pull-up. | Suitable where reset line must interface with multiple voltage domains (e.g., 1.8 V I/O), not direct MCU reset. | Select when level-shifting or wired-OR reset bus is required; avoid if direct push-pull drive is needed. |
| TPS3808G33DBVR | TI part with 3.3 V threshold, 200 ms reset delay (vs. 1.4 ms), no integrated watchdog timer. | Lacks watchdog capability; requires separate timer IC or MCU GPIO for fault recovery. | Choose only if watchdog is unnecessary and longer reset pulse is acceptable for legacy MCU compatibility. |
Compared with STM6825MWY6F, STM6823MWY6F trades push-pull simplicity for multi-rail flexibility, while TPS3808G33DBVR sacrifices watchdog integration for broader vendor support - making STM6825MWY6F optimal for compact, self-contained MCU supervision with autonomous fault recovery.
Availability
STM6825MWY6F is available at Aetrix Electronics and suitable for industrial automation, smart metering, automotive body electronics, and IoT edge gateway designs requiring stable component supply across extended product lifecycles.
Supply support for STM6825MWY6F 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 silicon solutions for automotive, industrial, and embedded markets since 1987.
The STM6xxx series was developed specifically for robust, low-power microprocessor supervision in industrial and automotive control units - emphasizing precision threshold accuracy, guaranteed low-VCC operation, and integrated watchdog reliability.
FAQ
Does STM6825MWY6F support 5 V VCC operation?
Yes - STM6825MWY6F operates with VCC from 1.0 V to 5.5 V per absolute maximum ratings, but its internal voltage monitor is fixed at 3.3 V ±2.5%. It will assert reset if the 3.3 V rail drops below threshold, regardless of whether VCC is supplied from a 3.3 V or 5 V source via regulator.
Can the watchdog timer be disabled without modifying the PCB?
Yes - leaving the WDI pin unconnected (floating) disables the watchdog function. The internal counter automatically services itself via low-high-low pulses, preventing unintended reset assertion. No solder jumper or configuration register is required.
What is the maximum capacitive load the RST output can drive?
The RST output is rated for 20 mA sink current and maintains valid logic levels with ≤50 pF total load capacitance. For heavier loads (e.g., long traces or multiple inputs), add a series resistor (≤100 Ω) to limit slew rate and prevent ringing, as confirmed in ST's application note AN2854.
Is STM6825MWY6F RoHS-compliant and halogen-free?
Yes - STM6825MWY6F is lead-free and fully compliant with the RoHS directive (2011/65/EU), and ST's official marking "MWY6F" indicates conformance to both RoHS and halogen-free requirements per IEC 61249-2-21.
STM6825MWY6F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.39V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
STM6825MWY6F FAQ
1.How can I place an order for STM6825MWY6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM6825MWY6F 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 STM6825MWY6F reliable?
The price and inventory of STM6825MWY6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM6825MWY6F is usually 5 days.
3.What payment methods are accepted for STM6825MWY6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM6825MWY6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM6825MWY6F?
STM6825MWY6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM6825MWY6F 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 STM6825MWY6F?
For technical support, including STM6825MWY6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM6825MWY6F requirements.
6.How does Aetrix verify that STM6825MWY6F is sourced from the original manufacturer or authorized distributors?
All STM6825MWY6F 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 STM6825MWY6F meets industry standards.
7.What is the process for return or replacement of STM6825MWY6F?
All STM6825MWY6F units undergo pre-shipment inspection (PSI). If there is an issue with STM6825MWY6F, 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 STM6825MWY6F part is unused and in its original packaging.
Return procedure for STM6825MWY6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM6825MWY6F 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…
