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STMicroelectronics STM809RWX6F
- Part No.:
- STM809RWX6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
STM809RWX6F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:10,460
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Product details
Overview
STM809RWX6F from STMicroelectronics is a precision active-low reset supervisor IC for 2.55–2.70 V supply monitoring in industrial microcontroller systems. It features a push-pull RST output, 140 ms minimum reset pulse width, 6 µA typical supply current, and guaranteed RST assertion down to VCC = 1.0 V - deployed in embedded power-up sequencing for MCU-based motor controllers.
For engineers reviewing the STM809RWX6F datasheet, STM809RWX6F pinout, STM809RWX6F application, or STM809RWX6F equivalent, key selection criteria include reset threshold accuracy (±2.5% over –40 °C to +85 °C), SOT23-3 package compatibility, manual reset absence, and immunity to sub-100 mV/20 µs VCC transients.
Technical Context
The STM809RWX6F implements a voltage-comparator-based reset generator with internal debounce logic and temperature-compensated reference (45 ppm/°C). Its reset assertion is triggered when VCC falls below VRST = 2.63 V (typ), and release occurs only after VCC exceeds VRST and remains stable for trec ≥ 140 ms.
No manual reset (MR) input is present - distinguishing it from STM811/812 variants - and its push-pull RST output actively drives low during reset and high otherwise, eliminating external pull-up requirements. The device operates across full industrial temperature range (–40 °C to +85 °C) with valid RST functionality down to VCC = 1.0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V (typ), 2.55–2.70 V (min/max over temp) - sets precise brown-out detection point for 2.7 V nominal supplies |
| Reset Pulse Width | 140–280 ms - ensures reliable MCU initialization by holding reset long enough for oscillator stabilization and register clearing |
| Supply Current | 6 µA (typ) at VCC < 3.6 V - enables ultra-low-power operation in battery-backed or energy-constrained systems |
| VCC Operating Range | 1.0–5.5 V - supports reset supervision across wide input rails including partially discharged backup supplies |
| Output Type | Active-low push-pull RST - provides rail-to-rail drive strength without external components, sinking 1.2 mA at 0.3 V |
| Temperature Range | –40 °C to +85 °C - qualified for industrial-grade reliability in factory automation and motor drive environments |
Pinout & Package
SOT23-3 (WX) package: compact 3-pin surface-mount outline with 0.95 mm max height, 2.8 mm × 2.1 mm footprint, and ECOPACK® lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Supply input | Primary power rail connection; monitors voltage level and powers internal comparator and output stage |
| 2 (GND) | Ground reference | Return path for supply current and reset output sink; must be low-impedance for accurate threshold sensing |
| 3 (RST) | Active-low reset output | Push-pull driver that asserts low during reset condition and floats high otherwise; directly interfaces with MCU /RESET pin |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 2.63 V ±2.5% over –40 °C to +85 °C - eliminates need for external trimming in 2.7 V system designs |
| Low quiescent current | 6 µA typ - extends battery life in always-on supervisory applications such as smart sensors and remote I/O modules |
| Guaranteed reset at low VCC | RST asserted down to VCC = 1.0 V - ensures fail-safe reset even during deep brown-out or capacitor discharge phases |
| Transient immunity | Immune to ≤20 µs, ≤100 mV VCC glitches - prevents spurious resets in electrically noisy motor control or switching power supply environments |
| Push-pull output architecture | No external pull-up required - simplifies PCB layout and reduces BOM count in space-constrained MCU subsystems |
Applications
| Industrial PLC I/O Module | Smart Energy Meter |
|---|---|
Use Scenario: Power-up sequencing and brown-out recovery in DIN-rail mounted programmable logic controller I/O cards. IC Role / Device Role / Timing Role: Supervisor IC generating clean, timed reset pulse to ARM Cortex-M3 microcontroller upon 24 V DC supply regulation to 2.7 V. Use Value: Prevents firmware lockup during line transients by asserting reset for ≥140 ms while ensuring compatibility with SOT23-3 board space constraints. |
Use Scenario: Reliable MCU reset during AC mains interruption and supercapacitor backup transitions in Class 0.5S electricity meters. IC Role / Device Role / Timing Role: Voltage monitor on 2.7 V LDO output, triggering reset before MCU enters undefined state during capacitor sag. Use Value: 6 µA supply current minimizes self-discharge of backup capacitor; 2.63 V threshold aligns precisely with meter SoC brown-out specification. |
| Automotive Body Control Module | Medical Infusion Pump Controller |
Use Scenario: Reset generation for microcontroller managing door locks, lighting, and window motors in 12 V automotive systems. IC Role / Device Role / Timing Role: Supervises 2.7 V domain derived from buck converter; asserts RST during cold-crank voltage dips below 6 V input. Use Value: Immunity to 20 µs/100 mV transients avoids false resets during relay switching noise; industrial temp grade supports under-hood placement. |
Use Scenario: Fail-safe reset initiation during battery voltage decay or LDO dropout in portable infusion pump main control board. IC Role / Device Role / Timing Role: Monitors 2.7 V supply feeding safety-critical ARM-based controller; guarantees reset until stable post-brown-out recovery. Use Value: Valid RST output down to VCC = 1.0 V ensures deterministic reset even during final battery discharge phase, meeting IEC 62304 Class C requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3T | 2.63 V threshold, SOT23-3, but 10 µA max ICC vs. 10 µA typ for STM809RWX6F; no guaranteed RST below 1.2 V | Lacks VCC = 1.0 V reset guarantee - unsuitable for deep brown-out recovery in battery-powered medical devices | Select when lower-cost sourcing is prioritized and full 1.0 V operation is not required |
| TPS3808G12QDBVRQ1 | 2.63 V threshold, automotive-grade (–40 °C to +125 °C), but 16-pin WSON package - incompatible footprint and higher cost | Designed for AEC-Q100 automotive systems; overqualified for industrial use and requires PCB redesign | Choose only if automotive qualification and extended temperature margin are mandatory |
Compared with MAX809TRD3T and TPS3808G12QDBVRQ1, the STM809RWX6F uniquely balances industrial temperature compliance, SOT23-3 footprint, 1.0 V reset guarantee, and sub-10 µA quiescent current - making it optimal for cost-sensitive, space-constrained embedded systems requiring robust brown-out handling.
Availability
STM809RWX6F is available at Aetrix Electronics and suitable for industrial PLC I/O modules, smart energy meters, and medical infusion pump controllers requiring stable component supply and long-term lifecycle support.
Supply support for STM809RWX6F 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 innovative solutions across automotive, industrial, and power management markets with strong IP and manufacturing vertical integration.
The STM809 series belongs to ST's precision voltage supervisor product line, engineered specifically for deterministic reset generation in resource-constrained microcontroller systems operating under variable or degraded supply conditions.
FAQ
What is the exact reset threshold voltage for STM809RWX6F?
The STM809RWX6F has a nominal reset threshold of 2.63 V, with guaranteed min/max values of 2.55 V and 2.70 V respectively across –40 °C to +85 °C. This corresponds to the 'R' suffix in the part number and is validated per Table 5 of ST's Doc ID 9873 Rev 5.
Does STM809RWX6F support manual reset functionality?
No - STM809RWX6F lacks a manual reset (MR) input pin. It is a dedicated active-low reset supervisor with only VCC, GND, and RST terminals. Manual reset capability is exclusive to STM811/812 variants in the same family, which use the SOT143-4 package and include MR functionality.
Can STM809RWX6F drive an MCU /RESET pin directly without external components?
Yes - its push-pull RST output actively drives both high and low states, eliminating the need for an external pull-up resistor. It sources/sinks up to 1.2 mA while maintaining VOL ≤ 0.3 V at VCC = VRST(min), enabling direct interface with standard CMOS /RESET inputs.
Is STM809RWX6F compatible with 3.3 V or 5 V supply rails?
Yes - although optimized for 2.7 V nominal systems, the device operates across VCC = 1.0–5.5 V per absolute maximum ratings. Its 2.63 V threshold remains stable regardless of supply voltage, allowing use in mixed-rail designs where the monitored domain is 2.7 V but other sections run at 3.3 V or 5 V.
STM809RWX6F 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:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
STM809RWX6F FAQ
1.How can I place an order for STM809RWX6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM809RWX6F 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 STM809RWX6F reliable?
The price and inventory of STM809RWX6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM809RWX6F is usually 5 days.
3.What payment methods are accepted for STM809RWX6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM809RWX6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM809RWX6F?
STM809RWX6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM809RWX6F 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 STM809RWX6F?
For technical support, including STM809RWX6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM809RWX6F requirements.
6.How does Aetrix verify that STM809RWX6F is sourced from the original manufacturer or authorized distributors?
All STM809RWX6F 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 STM809RWX6F meets industry standards.
7.What is the process for return or replacement of STM809RWX6F?
All STM809RWX6F units undergo pre-shipment inspection (PSI). If there is an issue with STM809RWX6F, 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 STM809RWX6F part is unused and in its original packaging.
Return procedure for STM809RWX6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM809RWX6F Tags
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MIC826SYMT-TR
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