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STMicroelectronics STM1812MWX7F
- Part No.:
- STM1812MWX7F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
STM1812MWX7F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,277
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Product details
Overview
STM1812MWX7F from STMicroelectronics is an active-high, push-pull reset supervisor IC designed to monitor 3.3 V or 3.0 V supply rails in microcontroller-based systems. It asserts a high-level reset signal when VCC drops below 3.06 V (typ.), maintains reset for ≥100 ms after VCC recovers, draws only 4 µA typical supply current, and operates across –40 °C to +105 °C - enabling reliable power-on reset in portable embedded controllers.
For engineers reviewing the STM1812MWX7F datasheet, STM1812MWX7F pinout, STM1812MWX7F application, or STM1812MWX7F equivalent, key selection criteria include its active-high push-pull output logic, factory-trimmed 3.06 V threshold, guaranteed operation down to VCC = 1.0 V, ±2.5% threshold accuracy over temperature, and SOT23-3 footprint compatibility with DS181x/MXD181x families.
Technical Context
The device integrates a precision voltage reference, comparator, and reset timer to detect brownout conditions on VCC. Its active-high push-pull output drives directly into MCU reset inputs without external pull-up components, eliminating bus contention risks present in open-drain alternatives.
Reset assertion is triggered solely by VCC falling below the 3.06 V threshold (±2.5% over –40 °C to +105 °C), with no manual reset or bidirectional detection capability - distinguishing it from STM1813/1818 variants. The internal timer guarantees minimum 100 ms reset pulse width independent of VCC slew rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.06 V (typ.), ±2.5% over full temperature range - ensures consistent brownout detection across industrial environments |
| Reset Pulse Width | ≥100 ms - provides sufficient time for MCU core and peripherals to fully initialize after power recovery |
| Supply Current | 4 µA (typ.) at 25 °C - enables multi-year battery life in always-on sensor nodes and portable devices |
| Operating Voltage Range | 1.0 V to 5.5 V - guarantees valid reset assertion even during deep brownout down to 1.0 V |
| Output Type | Active-high, push-pull - eliminates need for external pull-up resistor and supports direct connection to standard MCU reset pins |
| Temperature Range | –40 °C to +105 °C - qualified for automotive under-hood and industrial control applications |
| Package | SOT23-3 (WX marking) - 2.9 mm × 1.3 mm footprint compatible with high-density PCB layouts |
Pinout & Package
SOT23-3 package (WX code), 3-pin surface-mount outline with gull-wing leads, 1.3 mm body width, and 0.95 mm lead pitch per STMicroelectronics mechanical drawing Doc ID11464 Rev 8, Table 10.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-high reset output | Push-pull driver capable of sourcing >1 mA - directly interfaces with standard CMOS reset inputs without external components |
| 2 - VCC | Supply voltage input | Monitored rail input and power source - must be connected to the same 3.0/3.3 V domain being supervised |
| 3 - VSS | Ground reference | System ground return path for internal comparator and output stage - requires low-impedance connection to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 3.06 V (typ.) with ±2.5% tolerance - eliminates need for external resistor networks or calibration |
| Low quiescent current | 4 µA typical - reduces standby power in battery-powered IoT endpoints and wearables |
| VCC transient immunity | Rejects negative-going glitches ≤20 µs at 100 mV overdrive - prevents false resets from switching noise or ESD events |
| Guaranteed reset validity | Operates down to VCC = 1.0 V - ensures deterministic reset behavior during gradual brownout conditions |
| SOT23-3 footprint | Pin-compatible with DS181x and MXD181x families - enables drop-in replacement in legacy designs |
Applications
| Industrial PLC I/O Module | Automotive Body Control Module |
|---|---|
Use Scenario: Supervising 3.3 V microcontroller supply during engine cranking, where battery voltage dips to 6–9 V causing DC-DC output instability. IC Role / Device Role / Timing Role: Active-high reset supervisor asserting clean reset pulse upon 3.3 V rail collapse, holding MCU in reset until stable post-cranking. Use Value: Prevents firmware corruption during transient undervoltage by guaranteeing ≥100 ms reset hold time independent of VCC recovery slope. | Use Scenario: Power-on initialization of infotainment SoC requiring precise timing alignment between PMIC sequencing and processor reset release. IC Role / Device Role / Timing Role: Primary reset generator for 3.0 V auxiliary domain, providing active-high signal synchronized to 3.0 V rail stabilization. Use Value: Push-pull output eliminates external pull-up, reducing BOM count and board space while ensuring fast, glitch-free reset deassertion. |
| Medical Wearable Sensor Hub | Smart Energy Meter MCU Subsystem |
Use Scenario: Battery-powered glucose monitor operating from single Li-ion cell (2.7–4.2 V), requiring ultra-low-power supervision during sleep mode. IC Role / Device Role / Timing Role: Low-current (4 µA) reset supervisor monitoring regulated 3.3 V rail, asserting reset if battery sag causes regulator dropout. Use Value: Enables multi-year shelf life and operational life by minimizing quiescent draw while maintaining full temperature-range accuracy. | Use Scenario: Monitoring isolated 3.3 V supply feeding metrology ADC and real-time clock in ANSI C12.22-compliant meters. IC Role / Device Role / Timing Role: Brownout detector for safety-critical measurement subsystem, asserting reset before ADC reference drift exceeds 0.5%. Use Value: Factory-trimmed 3.06 V threshold with ±2.5% stability ensures consistent trip point across meter production batches and field temperature extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM1817TTR | Same 3.06 V threshold, identical active-high push-pull output, but marked for 5 V systems in ordering code - functionally identical to STM1812MWX7F | No functional difference; used in 5 V designs but electrically compatible with 3.3 V rails | Select when sourcing flexibility or dual-voltage design reuse is required |
| MAX809STR | 3.08 V threshold, 140 ms min. reset pulse, 1.2 µA supply current - lower power but longer reset duration and looser threshold tolerance (±3.5%) | Better suited for ultra-low-power applications where extended reset hold time is acceptable | Choose for battery lifetime optimization where 140 ms reset is permissible and ±3.5% threshold variation is tolerable |
Compared with STM1812MWX7F, STM1817TTR offers identical electrical behavior with different packaging/markings, while MAX809STR trades tighter threshold accuracy and shorter reset timing for significantly lower quiescent current - making it suitable only where extended reset duration does not disrupt system boot sequence.
Availability
STM1812MWX7F is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, medical wearable sensor hubs, and smart energy meter MCU subsystems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for STM1812MWX7F 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, analog, and sensing solutions for industrial, automotive, and consumer markets.
STM181x is ST's low-power reset supervisor product line, engineered for precision supply monitoring in space-constrained, battery-sensitive, and thermally demanding embedded systems - emphasizing factory-trimmed thresholds, sub-µA quiescent operation, and robust transient immunity.
FAQ
What is the exact reset threshold voltage for STM1812MWX7F?
The STM1812MWX7F has a factory-trimmed nominal reset threshold of 3.06 V, with ±2.5% accuracy guaranteed over the full operating temperature range of –40 °C to +105 °C. This value is specified in STMicroelectronics' official datasheet (Doc ID11464 Rev 8, Table 9) and confirmed by DC parameter testing under standard conditions.
Does STM1812MWX7F support manual reset via external push-button?
No. STM1812MWX7F lacks manual reset detection circuitry. Unlike STM1813/1818 variants, it responds exclusively to VCC voltage drops below its 3.06 V threshold and provides no debounced MR input functionality. Its RST pin is dedicated to active-high push-pull reset output only.
Can STM1812MWX7F be used with a 5 V supply rail?
No. STM1812MWX7F is specified for 3.0 V / 3.3 V supply monitoring, with absolute maximum VCC rating of 7.0 V but guaranteed reset operation only within 1.0–5.5 V. Its 3.06 V threshold is optimized for 3.3 V systems; using it on 5 V rails would result in premature reset assertion well above nominal operating voltage.
Is STM1812MWX7F pin-compatible with Maxim MAX809?
No. While both are active-high reset supervisors, STM1812MWX7F uses SOT23-3 with pinout RST–VCC–VSS, whereas MAX809STR uses SOT23-3 with pinout VCC–GND–RST. Physical pin mapping differs: Pin 1 is RST on STM1812MWX7F but VCC on MAX809STR - requiring PCB layout changes for substitution.
STM1812MWX7F 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:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
STM1812MWX7F FAQ
1.How can I place an order for STM1812MWX7F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM1812MWX7F 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 STM1812MWX7F reliable?
The price and inventory of STM1812MWX7F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM1812MWX7F is usually 5 days.
3.What payment methods are accepted for STM1812MWX7F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM1812MWX7F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM1812MWX7F?
STM1812MWX7F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM1812MWX7F 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 STM1812MWX7F?
For technical support, including STM1812MWX7F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM1812MWX7F requirements.
6.How does Aetrix verify that STM1812MWX7F is sourced from the original manufacturer or authorized distributors?
All STM1812MWX7F 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 STM1812MWX7F meets industry standards.
7.What is the process for return or replacement of STM1812MWX7F?
All STM1812MWX7F units undergo pre-shipment inspection (PSI). If there is an issue with STM1812MWX7F, 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 STM1812MWX7F part is unused and in its original packaging.
Return procedure for STM1812MWX7F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM1812MWX7F Tags
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MIC826SYMT-TR
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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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MCP120T-475I/TT
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