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STMicroelectronics STM1817SWX7F
- Part No.:
- STM1817SWX7F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
STM1817SWX7F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,618
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Product details
Overview
STM1817SWX7F from STMicroelectronics is an active-high, push-pull reset supervisor IC designed for 3.3 V/3.0 V microcontroller power 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 STM1817SWX7F datasheet, STM1817SWX7F pinout, STM1817SWX7F application, or STM1817SWX7F 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 STM1817SWX7F 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 guarantees minimum 100 ms reset pulse width (trec) after VCC rises above threshold, with valid output down to VCC = 1.0 V.
It features push-pull active-high RST output capable of sourcing ≥1.2 mA at VCC = 3.0 V (VOH ≥ 0.9 × VCC), and includes built-in immunity to negative-going VCC transients - rejecting ≤20 µs glitches at 100 mV underdrive without false triggering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.06 V (typ.), ±2.5% accuracy over full temperature range - ensures precise brownout detection for 3.3 V/3.0 V systems. |
| Reset Pulse Width | ≥100 ms - guarantees sufficient MCU reset hold time during power recovery. |
| Supply Current | 4 µA (typ.) at 25 °C - enables ultra-low-power operation in battery-powered devices. |
| Operating Voltage Range | 1.0 V to 5.5 V - supports valid reset assertion down to 1.0 V, critical for low-VCC brownout handling. |
| Output Type | Active-high, push-pull - drives MCU reset pin directly without external pull-up; VOH ≥ 0.9 × VCC at ISOURCE = 1.2 mA. |
| Temperature Range | –40 °C to +105 °C - qualified for industrial and automotive-adjacent embedded applications. |
| Reset Immunity | Rejects ≤20 µs VCC transients at 100 mV underdrive - prevents false resets from supply noise. |
Pinout & Package
STM1817SWX7F is housed in a 3-pin SOT23-3 (WX) package - surface-mount, lead-free, ECOPACK® compliant, footprint compatible with industry-standard SOT23-3 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-high reset output (push-pull) | Drives high to assert reset on microcontroller; sinks current when low, sources current when high; no external pull-up required. |
| 2 - VCC | Supply voltage input & reset threshold monitor | Primary power rail input; also feeds internal voltage reference/comparator - must be decoupled with 0.1 µF capacitor. |
| 3 - VSS | Ground reference | System ground connection; serves as reference for VCC monitoring and RST output logic levels. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 3.06 V threshold | Eliminates need for external resistor divider; reduces BOM count and layout area in space-constrained designs. |
| 100 ms minimum reset timeout | Ensures MCU completes full initialization before release - avoids race conditions in boot firmware. |
| 4 µA typical quiescent current | Extends battery life in always-on IoT sensors and wearables where supervisor current dominates standby power. |
| VCC = 1.0 V guaranteed operation | Provides deterministic reset behavior during deep brownout - prevents MCU lockup or undefined state. |
| Push-pull active-high output | Directly interfaces with MCUs requiring active-high reset (e.g., many ARM Cortex-M series), removing level-shifting complexity. |
Applications
| Industrial PLC I/O Module | Portable Medical Sensor Hub |
|---|---|
|
Use Scenario: Power supply fluctuates during field deployment due to long cable runs and shared AC adapters. IC Role / Device Role / Timing Role: Monitors 3.3 V LDO output and asserts active-high reset to ARM Cortex-M4 MCU if voltage sags below 3.06 V. Use Value: Prevents corrupted ADC sampling and UART frame errors by ensuring MCU resets cleanly before executing firmware. |
Use Scenario: Battery voltage declines gradually during multi-hour ECG monitoring sessions. IC Role / Device Role / Timing Role: Detects end-of-battery condition at 3.06 V and holds MCU in reset until user replaces cells. Use Value: Avoids unsafe operation near undervoltage - eliminates risk of missed arrhythmia detection due to erratic MCU behavior. |
| Smart Home Gateway Controller | Automotive Body Control Module (BCM) Subsystem |
|
Use Scenario: Cold-start engine cranking causes 3.3 V rail dip to 2.8 V for ~50 ms. IC Role / Device Role / Timing Role: Generates ≥100 ms active-high reset pulse to ESP32 host processor after rail recovery. Use Value: Guarantees full Wi-Fi stack reinitialization and secure TLS handshake restart - no stale network state. |
Use Scenario: Load dump transient on 5 V supply affects 3.3 V domain powering LIN transceiver MCU. IC Role / Device Role / Timing Role: Asserts reset only if VCC remains <3.06 V for >100 ms - ignores sub-20 µs spikes per spec. Use Value: Maintains communication continuity during electrical noise events while preventing spurious reboots. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUR+T | 3.08 V threshold (±2%), 140 ms reset timeout, 1.2 µA supply current, SOT23-3 | Higher timeout margin but tighter threshold tolerance; lower current draw ideal for coin-cell applications | Select when longer reset hold time and ultra-low IQ outweigh need for ST ecosystem alignment |
| TPS3808G30DBVR | 3.0 V threshold (±0.5%), 200 ms timeout, 1.1 µA IQ, open-drain active-low output | Requires external pull-up; superior threshold accuracy but incompatible output polarity and timing | Choose only if system design mandates active-low reset and sub-0.5% threshold precision |
Compared with STM1817SWX7F, MAX809SEUR+T offers longer reset duration and lower quiescent current but lacks ST's VCC=1.0 V guarantee; TPS3808G30DBVR provides higher threshold accuracy but requires redesign for active-low interface and adds external component overhead.
Availability
STM1817SWX7F is available at Aetrix Electronics and suitable for industrial PLC I/O modules, portable medical sensor hubs, smart home gateway controllers, and automotive BCM subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for STM1817SWX7F 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, designing and manufacturing analog, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.
STM181x is ST's low-power reset supervisor product line targeting space-constrained, battery-sensitive embedded systems requiring precision voltage monitoring and robust brownout protection without external components.
FAQ
What is the exact reset threshold voltage for STM1817SWX7F?
The STM1817SWX7F has a factory-trimmed nominal reset threshold of 3.06 V, with ±2.5% accuracy over the full operating temperature range (–40 °C to +105 °C), as specified in ST's Doc ID11464 Rev 8, Table 9 and Section 1.1.
Does STM1817SWX7F support manual reset via external push-button?
No - STM1817SWX7F does not include manual reset detect functionality. That feature is exclusive to STM1813/STM1818 variants. STM1817SWX7F provides only power-supply-monitored reset with active-high push-pull output.
Can STM1817SWX7F drive a standard 3.3 V microcontroller reset pin directly?
Yes - its active-high push-pull output sources ≥1.2 mA at VOH ≥ 0.9 × VCC (e.g., ≥2.97 V at VCC = 3.3 V), meeting typical MCU reset pin high-level input requirements without external components.
Is STM1817SWX7F compatible with DS181x-series supervisors?
Yes - ST explicitly states full compatibility with DS181x and MXD181x products in the datasheet (Section 1, "Features"), including identical pinout, function mapping, and electrical behavior for the active-high push-pull variant (DS1817 equivalent).
STM1817SWX7F 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:
- 2.88V
- 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
STM1817SWX7F FAQ
1.How can I place an order for STM1817SWX7F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM1817SWX7F 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 STM1817SWX7F reliable?
The price and inventory of STM1817SWX7F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM1817SWX7F is usually 5 days.
3.What payment methods are accepted for STM1817SWX7F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM1817SWX7F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM1817SWX7F?
STM1817SWX7F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM1817SWX7F 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 STM1817SWX7F?
For technical support, including STM1817SWX7F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM1817SWX7F requirements.
6.How does Aetrix verify that STM1817SWX7F is sourced from the original manufacturer or authorized distributors?
All STM1817SWX7F 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 STM1817SWX7F meets industry standards.
7.What is the process for return or replacement of STM1817SWX7F?
All STM1817SWX7F units undergo pre-shipment inspection (PSI). If there is an issue with STM1817SWX7F, 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 STM1817SWX7F part is unused and in its original packaging.
Return procedure for STM1817SWX7F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM1817SWX7F Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
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
Microchip Technology
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MCP809T-315I/TT
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