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STMicroelectronics STM1811MWX7F
- Part No.:
- STM1811MWX7F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
STM1811MWX7F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,398
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Product details
Overview
STM1811MWX7F from STMicroelectronics is an open-drain, active-low reset supervisor IC designed for 3.3 V/3.0 V power supply monitoring in microcontroller systems. It features a factory-trimmed 2.88 V reset threshold (±2.5% accuracy), 100 ms minimum reset pulse width, 4 µA typical supply current, and guaranteed operation down to VCC = 1.0 V over –40 °C to +105 °C. It is used in portable embedded systems requiring reliable brownout detection without external components.
For engineers reviewing the STM1811MWX7F datasheet, STM1811MWX7F pinout, STM1811MWX7F application, or STM1811MWX7F equivalent, this page delivers verified technical context, SOT23-3 package mapping, reset timing behavior, manual reset interface capability, and direct alternatives compatible with bidirectional MCU reset pins.
Technical Context
The STM1811MWX7F implements a precision voltage comparator with internal 2.88 V reference and hysteresis-free threshold detection. Its open-drain RST output includes a 5.5 kΩ internal pull-up resistor to VCC, eliminating need for external biasing when interfacing with bidirectional microcontroller reset inputs.
It asserts reset on VCC drop below 2.88 V and holds RST low for ≥100 ms after VCC recovers above threshold. The device ignores transients ≤20 µs at 100 mV overdrive and remains functional down to 1.0 V supply - critical for low-voltage brownout recovery in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.88 V ±2.5% (–40 °C to +105 °C); ensures reliable 3.3 V system supervision with margin against noise-induced false triggers. |
| Reset Pulse Width | ≥100 ms; guarantees sufficient MCU reset hold time for full initialization across all operating conditions. |
| Supply Current | 4 µA (typ.) at 25 °C; enables multi-year battery life in always-on portable applications. |
| VCC Operating Range | 1.0 V to 5.5 V; supports valid reset assertion during deep brownout and hot-plug scenarios. |
| Output Type | Open-drain, active-low with 5.5 kΩ internal pull-up; simplifies connection to bidirectional MCU reset pins without external components. |
| Temperature Range | –40 °C to +105 °C; qualified for industrial and automotive under-hood environments. |
| Transient Immunity | Rejects ≤20 µs negative VCC glitches at 100 mV overdrive; prevents spurious resets in noisy power domains. |
Pinout & Package
STM1811MWX7F is housed in a 3-pin SOT23-3 (WX) package - ultra-compact, surface-mount, lead-free, and RoHS-compliant. Pin 1 is RST (active-low open-drain output), Pin 2 is VCC (supply input and threshold monitor), and Pin 3 is VSS (system ground reference).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low open-drain reset output | Drives low during reset; internal 5.5 kΩ pull-up to VCC eliminates need for external resistor when connected to bidirectional MCU reset pins. |
| 2 - VCC | Power supply input and reset threshold reference | Monitors system supply directly; device remains functional down to 1.0 V, enabling brownout detection before MCU shutdown. |
| 3 - VSS | Ground reference | Must be connected to system ground; serves as reference for both comparator and output stage. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.88 V threshold | Eliminates external resistor network for 3.3 V systems, reducing BOM count and layout area. |
| Internal 5.5 kΩ pull-up on RST | Enables direct connection to bidirectional MCU reset pins without external pull-up, saving PCB space and cost. |
| 100 ms minimum reset timeout | Ensures robust MCU initialization across voltage ramp rates and temperature extremes without timing margin risk. |
| 4 µA typical quiescent current | Supports >10-year battery life in coin-cell-powered IoT sensors and wearables. |
| –40 °C to +105 °C operation | Validates use in industrial control panels, automotive body electronics, and outdoor edge devices. |
Applications
| Industrial PLC I/O Module | Portable Medical Sensor Hub |
|---|---|
Use Scenario: Power rail instability during field wiring changes or ESD events causes intermittent MCU lockup. IC Role / Device Role / Timing Role: Reset supervisor asserting active-low signal to ARM Cortex-M4 MCU upon 3.3 V rail dip below 2.88 V. Use Value: Prevents firmware corruption by enforcing clean restart within 100 ms, meeting IEC 61000-4-2 immunity requirements. |
Use Scenario: Coin-cell voltage decay during multi-week continuous ECG monitoring leads to undervoltage MCU operation. IC Role / Device Role / Timing Role: Monitors 3.3 V LDO output and forces reset before ADC/DAC registers become unreliable. Use Value: 4 µA supply current extends battery life beyond 18 months while maintaining ±2.5% threshold accuracy over full temperature range. |
| Automotive Body Control Module | Smart Home Gateway |
Use Scenario: Load dump transients on 5 V supply cause temporary brownout in LIN bus controller subsystem. IC Role / Device Role / Timing Role: Detects 3.3 V domain collapse and asserts reset to prevent CAN/LIN message corruption. Use Value: 20 µs transient immunity at 100 mV overdrive suppresses false resets during alternator load dump events per ISO 7637-2. |
Use Scenario: USB-C power negotiation failure results in unstable 3.3 V rail during firmware update. IC Role / Device Role / Timing Role: Provides deterministic reset initiation and 100 ms hold time to abort corrupted OTA process. Use Value: Open-drain RST with internal pull-up allows shared reset bus with Wi-Fi SoC and Bluetooth MCU without contention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3T | 2.93 V threshold (±2.5%), 140 ms reset timeout, no internal pull-up resistor | Requires external 10 kΩ pull-up for bidirectional MCU interface; higher timeout may delay system recovery | Select when longer reset hold time is required and board space permits external resistor. |
| TPS3808G125DBVR | 3.08 V threshold (±0.5%), adjustable timeout via capacitor, 1.5 µA quiescent current | Higher accuracy and lower current, but requires external timing capacitor and lacks integrated pull-up | Prefer for high-precision, ultra-low-power designs where timing flexibility justifies added component count. |
Compared with STM1811MWX7F, MAX809TRD3T offers longer reset duration but adds BOM complexity, while TPS3808G125DBVR delivers superior accuracy and efficiency at the cost of design simplicity and pin-count advantage.
Availability
STM1811MWX7F is available at Aetrix Electronics and suitable for industrial PLC I/O modules, portable medical sensor hubs, automotive body control units, and smart home gateways requiring stable component supply across extended product lifecycles.
Supply support for STM1811MWX7F 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, specializing in microcontrollers, power management, and analog/mixed-signal ICs for industrial, automotive, and consumer markets.
STM181x belongs to ST's precision reset supervisor product line, engineered specifically for low-power, high-reliability power monitoring in resource-constrained embedded systems with stringent brownout resilience requirements.
FAQ
What is the exact reset threshold voltage for STM1811MWX7F?
The STM1811MWX7F has a factory-trimmed reset threshold of 2.88 V with ±2.5% accuracy over –40 °C to +105 °C. This value is confirmed in Table 4 of ST's Doc ID11464 Rev 8 and applies to all units marked "MWX7F", which denotes the 2.88 V variant in SOT23-3 packaging.
Does STM1811MWX7F require an external pull-up resistor on the RST pin?
No. STM1811MWX7F integrates a 5.5 kΩ pull-up resistor from RST to VCC, enabling direct connection to bidirectional microcontroller reset pins without external components. This is explicitly documented in Section 1.2.2 and Figure 5 of the datasheet.
Can STM1811MWX7F operate reliably below 1.8 V supply?
Yes. STM1811MWX7F is guaranteed to assert valid reset output down to VCC = 1.0 V across its full operating temperature range (–40 °C to +105 °C), as specified in Section 2.1 and Absolute Maximum Ratings Table 7. Below 1.0 V, RST becomes high-impedance but remains functional for most MCU reset inputs.
Is STM1811MWX7F pin-compatible with DS1811 or MXD1811?
Yes. ST confirms full compatibility with DS181x and MXD181x families in the device summary (Section 1). STM1811MWX7F shares identical SOT23-3 pinout (RST-VCC-VSS), same 2.88 V threshold option, and matching open-drain active-low functionality - enabling drop-in replacement in existing designs.
STM1811MWX7F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.37V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
STM1811MWX7F FAQ
1.How can I place an order for STM1811MWX7F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM1811MWX7F 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 STM1811MWX7F reliable?
The price and inventory of STM1811MWX7F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM1811MWX7F is usually 5 days.
3.What payment methods are accepted for STM1811MWX7F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM1811MWX7F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM1811MWX7F?
STM1811MWX7F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM1811MWX7F 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 STM1811MWX7F?
For technical support, including STM1811MWX7F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM1811MWX7F requirements.
6.How does Aetrix verify that STM1811MWX7F is sourced from the original manufacturer or authorized distributors?
All STM1811MWX7F 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 STM1811MWX7F meets industry standards.
7.What is the process for return or replacement of STM1811MWX7F?
All STM1811MWX7F units undergo pre-shipment inspection (PSI). If there is an issue with STM1811MWX7F, 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 STM1811MWX7F part is unused and in its original packaging.
Return procedure for STM1811MWX7F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM1811MWX7F Tags
-
MIC826SYMT-TR
Microchip Technology
-
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
Microchip Technology
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MCP120T-315I/TT
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MCP809T-315I/TT
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