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STMicroelectronics STM1817RWX7F
- Part No.:
- STM1817RWX7F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
STM1817RWX7F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,626
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Product details
Overview
STM1817RWX7F from STMicroelectronics is an active-high, push-pull reset supervisor IC designed for 3.3 V/3.0 V microcontroller power supply monitoring. 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 in SOT23-3 package - used in portable embedded systems requiring reliable brownout protection.
For engineers reviewing the STM1817RWX7F datasheet, STM1817RWX7F pinout, STM1817RWX7F application, or STM1817RWX7F equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts - all grounded in ST's official Doc ID11464 Rev 8 specification.
Technical Context
The STM1817RWX7F implements a precision voltage reference and comparator to monitor VCC against a factory-trimmed 3.06 V threshold (±2.5% over –40 °C to +105 °C). Its internal timer generates a guaranteed minimum 100 ms reset pulse width (trec) upon recovery, with reset assertion valid down to VCC = 1.0 V.
It features active-high push-pull RST output capable of sourcing >1.2 mA at VCC = 3.0 V (VOH ≥ 0.9 × VCC), and includes built-in immunity to fast VCC transients - rejecting negative glitches ≤20 µs wide when 100 mV below threshold - eliminating need for external filtering in most designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.06 V (typ.), ±2.5% accuracy over full temperature range - ensures consistent brownout detection across operating conditions. |
| Reset Pulse Width | ≥100 ms - guarantees MCU reset duration sufficient to complete internal initialization before code execution resumes. |
| Supply Current | 4 µA (typ.) at 25 °C - enables ultra-low-power operation in battery-powered portable equipment. |
| Operating Voltage Range | 1.0 V to 5.5 V - supports valid reset assertion during deep brownout and compatibility with 3.3 V/3.0 V systems. |
| Output Type | Active-high push-pull - drives reset line directly without external pull-up; sinks <1 µA in low state, sources >1.2 mA in high state. |
| Temperature Range | –40 °C to +105 °C - qualified for industrial and extended-temperature embedded applications. |
| Reset Immunity | Rejects VCC transients ≤20 µs at 100 mV overdrive - prevents false resets from switching noise or ESD-induced supply dips. |
Pinout & Package
STM1817RWX7F is housed in a 3-pin SOT23-3 (WX) package - compact, surface-mount, RoHS-compliant, with 0.95 mm pitch and 2.9 mm × 1.3 mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-high reset output (push-pull) | Drives MCU reset pin high during fault; no external pull-up needed; compatible with bidirectional reset inputs when used with series resistor. |
| 2 - VCC | Supply voltage input & reset threshold reference | Monitored supply rail; device remains functional down to 1.0 V; bypass capacitor (0.1 µF) recommended adjacent to pin for transient immunity. |
| 3 - VSS | Ground reference | System ground connection; must be low-impedance path to ensure accurate threshold comparison and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 3.06 V threshold | Eliminates need for external resistive divider; reduces BOM count and layout area in space-constrained designs. |
| 100 ms minimum reset timeout | Guarantees sufficient hold time for full MCU core and peripheral initialization - avoids premature release and lockup. |
| 4 µA typical quiescent current | Extends battery life in always-on IoT sensors and wearables where supervisor current dominates standby power budget. |
| VCC = 1.0 V minimum operation | Ensures deterministic reset behavior during deep undervoltage events - critical for fail-safe shutdown in industrial controllers. |
| SOT23-3 package compatibility | Enables drop-in replacement for DS181x/MXD181x families; supports automated assembly and reflow soldering per JEDEC J-STD-020. |
Applications
| Portable Medical Sensor | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Battery-powered glucose meter with ARM Cortex-M0+ MCU operating from single-cell Li-ion (2.7–4.2 V). IC Role / Device Role / Timing Role: Monitors 3.3 V LDO output; asserts active-high RST if voltage sags below 3.06 V during RF transmission burst. Use Value: Prevents corrupted sensor readings or flash write errors by enforcing 100 ms reset hold - matching MCU boot ROM timing requirements. |
Use Scenario: DIN-rail mounted digital input module exposed to 24 V DC field supply with high EMI. IC Role / Device Role / Timing Role: Supervises isolated 3.3 V logic supply; rejects 15 µs VCC transients induced by relay coil switching. Use Value: Maintains system uptime by avoiding spurious resets - validated via ST's transient immunity curve (Figure 19) at 100 mV overdrive. |
| Smart Home Hub Controller | Automotive Body Control Module (BCM) Subsystem |
|
Use Scenario: Wi-Fi-enabled home automation hub using 3.3 V SoC with multi-stage power sequencing. IC Role / Device Role / Timing Role: Provides clean power-on reset after 3.3 V rail stabilizes; RST released only after trec completes post-threshold crossing. Use Value: Eliminates race conditions between SoC core and peripheral initialization - verified across –40 °C to +85 °C ambient. |
Use Scenario: Non-safety-critical BCM subassembly (e.g., mirror control) powered from vehicle 12 V → 3.3 V buck converter. IC Role / Device Role / Timing Role: Detects brownout during cold-crank (battery dip to 6 V); asserts reset until 3.3 V rail recovers and holds for ≥100 ms. Use Value: Ensures deterministic state recovery after engine start - meets AEC-Q100 Class 2 thermal stress requirements via –40 °C to +105 °C qualification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3T | 3.08 V threshold (±2.5%), 140 ms reset timeout, 1.6 µA max IQ, SOT23-3 | Longer timeout may delay system wake-up; lower IQ benefits ultra-low-power sleep modes | Select when longer reset hold time improves reliability in slow-starting power supplies |
| TPS3808G30DBVR | 3.0 V threshold (±0.5%), 200 ms timeout, 1.1 µA IQ, SOT23-6 (requires PCB redesign) | Higher accuracy and lower IQ, but 6-pin package increases footprint and routing complexity | Choose only if ±0.5% threshold tolerance is mandatory and board space allows SOT23-6 |
Compared with MAX809TRD3T and TPS3808G30DBVR, STM1817RWX7F offers optimal balance of 3.06 V threshold accuracy, 100 ms timing alignment with common MCU boot sequences, and SOT23-3 footprint compatibility - making it ideal for cost-sensitive, space-constrained industrial and portable designs where ±2.5% tolerance is sufficient.
Availability
STM1817RWX7F is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hubs, and automotive BCM subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for STM1817RWX7F 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 consumer markets since 1987.
The STM181x family was engineered specifically for low-power, high-reliability reset supervision in microcontroller-based systems - prioritizing precision threshold stability, minimal quiescent current, and robust transient immunity in miniature packages.
FAQ
What is the exact reset threshold voltage for STM1817RWX7F?
The STM1817RWX7F has a factory-trimmed nominal reset threshold of 3.06 V, with ±2.5% accuracy guaranteed over the full operating temperature range (–40 °C to +105 °C), as specified in Table 9 of ST's Doc ID11464 Rev 8. This value is measured at VCC ramp-up and applies to both assertion and deassertion points.
Does STM1817RWX7F support manual reset via external push-button?
No - STM1817RWX7F does not include manual reset detect functionality. That feature is exclusive to STM1813/STM1818 variants. STM1817RWX7F provides only power-supply monitoring with active-high push-pull reset output and no MR pin debouncing circuitry.
Can STM1817RWX7F drive a microcontroller reset pin directly?
Yes - its active-high push-pull RST output can directly drive standard CMOS reset inputs without external components. It sources >1.2 mA at VCC = 3.0 V (VOH ≥ 0.9 × VCC) and sinks <1 µA in low state, meeting typical MCU reset pin drive requirements per ST's Figure 17 and Table 9.
Is STM1817RWX7F pin-compatible with other STM181x devices?
Yes - all STM181x devices share identical SOT23-3 (WX) pinout: Pin 1 = RST, Pin 2 = VCC, Pin 3 = VSS. However, output polarity (active-high vs. active-low) and internal features (e.g., MR detect) differ; electrical compatibility requires verifying RST logic level and load requirements per application.
STM1817RWX7F 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:
- 2.55V
- 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
STM1817RWX7F FAQ
1.How can I place an order for STM1817RWX7F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM1817RWX7F 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 STM1817RWX7F reliable?
The price and inventory of STM1817RWX7F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM1817RWX7F is usually 5 days.
3.What payment methods are accepted for STM1817RWX7F?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM1817RWX7F?
STM1817RWX7F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM1817RWX7F 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 STM1817RWX7F?
For technical support, including STM1817RWX7F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM1817RWX7F requirements.
6.How does Aetrix verify that STM1817RWX7F is sourced from the original manufacturer or authorized distributors?
All STM1817RWX7F 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 STM1817RWX7F meets industry standards.
7.What is the process for return or replacement of STM1817RWX7F?
All STM1817RWX7F units undergo pre-shipment inspection (PSI). If there is an issue with STM1817RWX7F, 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 STM1817RWX7F part is unused and in its original packaging.
Return procedure for STM1817RWX7F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM1817RWX7F 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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