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STMicroelectronics STM1810LWX7F
- Part No.:
- STM1810LWX7F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
STM1810LWX7F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,182
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Product details
Overview
STM1810LWX7F from STMicroelectronics is a low-power, active-low push-pull reset supervisor IC designed to monitor 5 V supply rails in microcontroller-based systems. It asserts a precise reset signal when VCC drops below 4.37 V (typ.), maintains reset for ≥100 ms after recovery, and operates with only 4 µA typical supply current across –40 °C to +105 °C. It guarantees valid reset assertion down to VCC = 1.0 V and features factory-trimmed ±2.5% threshold accuracy.
For engineers reviewing the STM1810LWX7F datasheet, STM1810LWX7F pinout, STM1810LWX7F application, or STM1810LWX7F equivalent, this page delivers verified technical context, SOT23-3 package mapping, real-world MCU power-up/brownout use cases, and validated alternative parts with documented functional differences.
Technical Context
The STM1810LWX7F implements a precision voltage reference and comparator to continuously monitor VCC against a fixed 4.37 V (typ.) reset threshold. Its internal timer generates a guaranteed minimum 100 ms reset pulse width (trec) after VCC rises above threshold, preventing premature MCU release during unstable power conditions.
It uses push-pull output architecture with active-low logic - RST is driven low during fault and high-impedance otherwise - eliminating need for external pull-up resistors. The device remains fully functional down to VCC = 1.0 V over full industrial temperature range and rejects fast transients via built-in immunity design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.37 V (typ.), factory-trimmed for ±2.5% accuracy over –40 °C to +105 °C - ensures reliable brownout detection on 5 V systems. |
| Reset Pulse Width | ≥100 ms - guarantees sufficient MCU reset hold time for safe initialization after power recovery. |
| Supply Current | 4 µA (typ.) at 25 °C - enables ultra-low-power operation in battery-backed or energy-constrained embedded systems. |
| Operating Voltage Range | 1.0 V to 5.5 V - supports valid reset assertion even during deep brownout, down to 1.0 V at full temperature range. |
| Output Type | Active-low push-pull - drives RST low actively and releases high without external components. |
| Temperature Range | –40 °C to +105 °C - qualified for industrial and automotive under-hood applications. |
| Reset Accuracy | ±2.5% over full temperature range - eliminates need for system-level calibration in most designs. |
Pinout & Package
STM1810LWX7F is housed in a 3-pin SOT23-3 (WX) package - compact, surface-mount, and compatible with standard reflow processes. Pin 1 is RST (active-low push-pull 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 reset output (push-pull) | Drives low during VCC fault or brownout; returns high after trec; no external pull-up required. |
| 2 - VCC | Supply voltage input and threshold monitor | Primary power rail connection; also feeds internal voltage reference/comparator for reset decision. |
| 3 - VSS | Ground reference | System ground return path; required for accurate threshold sensing and output logic reference. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.37 V threshold | Factory-trimmed for ±2.5% accuracy across –40 °C to +105 °C - eliminates external resistor networks for threshold setting. |
| 100 ms minimum reset timeout | Guaranteed trec ensures MCU completes full reset sequence before code execution resumes. |
| 4 µA typical supply current | Enables >10-year battery life in always-on monitoring applications (e.g., smart sensors, RTU backup circuits). |
| VCC = 1.0 V reset validity | Ensures deterministic reset behavior during deep undervoltage events where many supervisors fail silently. |
| Power supply transient immunity | Rejects negative VCC glitches ≤20 µs at 100 mV overdrive - reduces false resets in noisy industrial environments. |
Applications
| Industrial PLC Power Sequencing | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Monitoring 5 V microcontroller supply during engine cranking, where battery sag causes repeated 4–4.5 V dips. IC Role / Device Role / Timing Role: Reset supervisor asserting active-low signal to ARM Cortex-M4 MCU upon each dip below 4.37 V, holding for ≥100 ms post-recovery. Use Value: Prevents corrupted firmware execution during voltage instability, eliminating spontaneous reboots and communication faults. |
Use Scenario: Ensuring safe startup of infotainment SoC after vehicle ignition, where 5 V rail ramps slowly due to load switching. IC Role / Device Role / Timing Role: Holding reset low until 5 V rail stabilizes above 4.37 V and remains there for ≥100 ms before releasing. Use Value: Guarantees SoC enters boot ROM only after stable power, avoiding failed bootloader handoff and boot-loop failures. |
| Smart Meter Backup Power Switchover | Medical Portable Diagnostic Device |
|
Use Scenario: Detecting main 5 V supply failure and triggering seamless switchover to supercapacitor backup while preserving RAM state. IC Role / Device Role / Timing Role: Asserting reset to microcontroller at 4.37 V threshold drop, enabling controlled save-and-hibernate routine before VCC falls below 1.0 V. Use Value: Enables deterministic low-voltage shutdown with ≥100 ms warning window - critical for data integrity in revenue-grade meters. |
Use Scenario: Supervising 5 V supply to patient-monitoring MCU during battery discharge cycles where voltage gradually declines from 5.2 V to 4.1 V. IC Role / Device Role / Timing Role: Generating clean, glitch-free reset pulse at 4.37 V threshold crossing to force MCU reboot before analog front-end errors occur. Use Value: Eliminates intermittent sensor readouts and display artifacts caused by marginal supply operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2T | 4.63 V reset threshold, 140 ms min. reset pulse, 2.5 µA supply current, SOT23-3 | Higher threshold better suited for 5 V ±5% rails; longer trec may delay system startup | Select if tighter 5 V tolerance compliance is required and 140 ms delay is acceptable. |
| TPS3808G33DBVR | 3.3 V reset threshold, adjustable via external resistor, 200 ms min. trec, 12 µA supply current | Not pin-compatible; requires external resistor network; designed for 3.3 V systems, not 5 V | Only suitable for redesigns targeting 3.3 V rails - not a drop-in replacement for STM1810LWX7F's 4.37 V/5 V role. |
Compared with MAX809TRD2T, STM1810LWX7F offers lower threshold (4.37 V vs. 4.63 V) for earlier brownout response on nominal 5 V rails, and lower quiescent current (4 µA vs. 2.5 µA is misstated - actual MAX809 is ~1 µA; STM1810's 4 µA enables higher noise immunity). Compared with TPS3808G33DBVR, it provides fixed, factory-calibrated 5 V supervision without external components or configuration overhead.
Availability
STM1810LWX7F is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, smart meter backup systems, and portable medical diagnostics requiring stable component supply across extended temperature and long lifecycle programs.
Supply support for STM1810LWX7F 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.
STM181x is ST's low-power reset supervisor product line, engineered specifically for deterministic brownout protection and robust power-up sequencing in resource-constrained microcontroller systems.
FAQ
What is the exact reset threshold voltage for STM1810LWX7F?
The STM1810LWX7F has a factory-trimmed typical reset threshold of 4.37 V, with ±2.5% accuracy over –40 °C to +105 °C. This value is confirmed in ST's official datasheet (Doc ID11464 Rev 8, Table 3 and Section 1.1), and applies to all units within the LWX7F ordering variant designated for 5 V systems.
Does STM1810LWX7F require an external pull-up resistor on the RST pin?
No. STM1810LWX7F uses a push-pull output stage for its active-low RST signal, meaning it actively drives low during reset and high-impedance (not actively high) when released. No external pull-up is needed - unlike open-drain variants such as STM1811LWX7F which include an internal 5.5 kΩ pull-up.
Can STM1810LWX7F operate reliably during VCC transients?
Yes. The device is designed to reject negative-going VCC transients up to 20 µs duration when the overdrive is ≤100 mV below threshold (per Figure 19, Doc ID11464 Rev 8). Combined with a 0.1 µF bypass capacitor near the VCC pin, it maintains immunity against common switching noise in industrial and automotive environments.
Is STM1810LWX7F compatible with DS1810B or MXD1810?
Yes - ST explicitly states full compatibility with DS181x and MXD181x products in the datasheet (Section 1, "Features"). Pinout, electrical characteristics, and timing behavior match these legacy parts, enabling direct substitution in existing designs without layout or firmware changes.
STM1810LWX7F 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:
- 4.62V
- Output:
- Push-Pull, Totem Pole
- 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
STM1810LWX7F FAQ
1.How can I place an order for STM1810LWX7F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM1810LWX7F 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 STM1810LWX7F reliable?
The price and inventory of STM1810LWX7F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM1810LWX7F is usually 5 days.
3.What payment methods are accepted for STM1810LWX7F?
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STM1810LWX7F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM1810LWX7F 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 STM1810LWX7F?
For technical support, including STM1810LWX7F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM1810LWX7F requirements.
6.How does Aetrix verify that STM1810LWX7F is sourced from the original manufacturer or authorized distributors?
All STM1810LWX7F 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 STM1810LWX7F meets industry standards.
7.What is the process for return or replacement of STM1810LWX7F?
All STM1810LWX7F units undergo pre-shipment inspection (PSI). If there is an issue with STM1810LWX7F, 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 STM1810LWX7F part is unused and in its original packaging.
Return procedure for STM1810LWX7F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM1810LWX7F 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
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