STM1811LWX7F STMicroelectronics Integrated Circuit (SOT23 (3-Pin)) In Stock
STMicroelectronics STM1811LWX7F is a voltage supervisor and reset monitor for 3 V, 3.3 V, and 5 V rails with active-low open-drain output in a 3-pin SOT-23 package. From $0.25, in stock, worldwide shipping.
- Manufacturer
- STMicroelectronics
- Package
- SOT23 (3-Pin)
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- STM1811LWX7F Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.3378(MOQ 250)
- Temp Range
- -40.0°C to 105.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of STM1811LWX7F?
- Fixed threshold monitoring for 3 V, 3.3 V, and 5 V supply rails in a single 3-pin SOT-23 package requiring no external components
- Active-low open-drain reset output is directly compatible with microcontroller reset inputs without level-shifting circuitry
- Ultra-low quiescent current consumption suitable for always-on supervisory circuits in battery-backed systems
What is STM1811LWX7F used for?
The STM1811LWX7F is used as a power-on reset generator in microcontroller-based embedded systems to hold the processor in reset until the supply rail reaches a stable voltage. Its open-drain active-low output is directly wirable to MCU NRST pins on 3.3 V and 5 V boards, making it a near-zero-BOM supervisory solution for industrial sensors, consumer appliances, and IoT edge nodes. The compact SOT-23 footprint fits easily alongside any microcontroller on space-constrained PCBs.
What are the specifications of STM1811LWX7F?
| Factory Lead Time | 24Weeks |
| YTEOL | 7 |
| Adjustable Threshold | NO |
| Analog IC - Other Type | VOLTAGE SUPERVISOR/RESET IC |
| JESD-30 Code | R-PDSO-G3 |
| JESD-609 Code | e4 |
| Number of Channels | 1 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TO-236 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 0.016mA |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 1.2V |
| Supply Voltage-Nom (Vsup) | 3.6V |
| Surface Mount | YES |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.96mm |
| Terminal Position | DUAL |
| Threshold Voltage-Nom | +4.62V |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | SOT23 (3-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Malaysia |
Where can I find the STM1811LWX7F datasheet?
STM1811LWX7F Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for STM1811LWX7F?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
Which supply voltage thresholds does the STM1811LWX7F monitor, and how does it assert its reset output?
The STM1811LWX7F monitors fixed thresholds for 3 V, 3.3 V, or 5 V rails (determined by the part suffix) and asserts an active-low open-drain reset output whenever the supply drops below the threshold, holding the connected processor in reset for a minimum assertion period to ensure orderly system restart.
What reset pulse width does the STM1811LWX7F provide, and why is this important for microcontroller startup?
The device provides a minimum reset pulse width of approximately 200 ms after the supply voltage crosses the detection threshold, which satisfies the power-on reset timing requirements of most 8-bit and 32-bit microcontrollers that require the reset pin to remain asserted for at least 100 µs after VDD stabilizes.
Can the STM1811LWX7F drive multiple microcontroller reset inputs on the same board?
Yes. The open-drain output can be wire-ORed with other reset sources and can drive multiple NRST inputs in parallel, as long as the combined pull-down current stays within the device's 10 mA maximum sink current rating, making it straightforward to reset an MCU and an EEPROM simultaneously from a single supervisor.
How does the SOT-23 package of the STM1811LWX7F compare to larger supervisor packages for board space optimization?
The 3-pin SOT-23 occupies approximately 3 mm² of PCB area, which is 4 to 8 times smaller than 8-pin SOIC or DIP supervisors, allowing the STM1811LWX7F to be placed directly adjacent to the monitored IC's supply decoupling capacitors with minimal routing overhead.
Is the STM1811LWX7F suitable for industrial temperature range applications?
The STM1811LWX7F is specified over the industrial temperature range of -40°C to +85°C, covering the majority of industrial sensor, motor controller, and building automation applications where supply supervisors must function reliably across wide ambient temperature swings without calibration drift.
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Why Buy from FindMyChip
About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 250+ | $0.5690 | $142.25 |
| 500+ | $0.5455 | $272.76 |
| 1000+ | $0.5312 | $531.23 |
| 9000+ | $0.4848 | $4362.84 |
| 12000+ | $0.3395 | $4074.00 |
| 24000+ | $0.3377 | $8106.00 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“Their engineering team helped us find a pin-compatible alternative when our original MCU went EOL.”
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