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STMicroelectronics STM802TM6F
- Part No.:
- STM802TM6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
STM802TM6F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
STM802TM6F from STMicroelectronics is a 3 V microprocessor supervisory IC with integrated battery switchover, active-low push-pull RST output, manual reset (MR), watchdog timer (1.6 s typ), and power-fail comparator (PFI/PFO). It guarantees reset assertion down to VCC = 1.0 V and operates from –40 °C to +85 °C for industrial embedded systems requiring reliable power monitoring and SRAM backup control.
For engineers reviewing the STM802TM6F datasheet, STM802TM6F pinout, STM802TM6F application, or STM802TM6F equivalent, key selection criteria include guaranteed reset at low VCC, automatic VCC/VBAT switchover at 2.4 V, 200 ms typical reset timeout (trec), 40 µA typical supply current, and compatibility with external LPSRAM in battery-backed memory systems.
Technical Context
The STM802 implements a precision voltage monitor with VRST = 2.63 V (±1.5%) and VSW = 2.4 V for seamless battery switchover. Its internal watchdog timer triggers reset if WDI remains static for ≥1.6 s, and the PFI/PFO comparator provides early power-fail warning when VCC drops below VSW or PFI falls below VPFI (1.25 V).
Reset assertion is synchronized to VCC crossing VRST, with trec = 200 ms (typ) ensuring stable MCU initialization. The device uses a P-channel MOSFET switch (RON < 100 Ω) between VCC/VBAT and VOUT, enabling up to 75 mA load current while maintaining low battery drain (0.4 µA typ in backup mode).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset threshold (VRST) | 2.63 V ±1.5% - ensures deterministic reset assertion before MCU brownout |
| Switchover voltage (VSW) | 2.4 V - triggers automatic VCC-to-VBAT transition for LPSRAM backup |
| Reset timeout (trec) | 200 ms (typ) - provides sufficient hold time for full MCU power-up sequencing |
| Watchdog timeout (tWD) | 1.6 s (typ) - detects firmware lockup without requiring external timing components |
| Supply current (ICC) | 40 µA (typ) - minimizes main rail loading during normal operation |
| Battery current (IVBAT) | 0.4 µA (typ) - extends backup battery life in long-term storage or standby |
| Operating temperature | –40 °C to +85 °C - qualified for industrial-grade embedded environments |
Pinout & Package
STM802TM6F is housed in an 8-pin SO8 (Small Outline) package per JEDEC MS-012, with 1.27 mm pitch and surface-mount footprint. Pin 1 is marked by a dot or bevelled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFO | Power-fail output (push-pull) | Active-low signal indicating imminent VCC failure or PFI < 1.25 V |
| PFI | Power-fail input | Monitors external voltage rail; asserts PFO when below 1.25 V threshold |
| WDI | Watchdog input | Edge-sensitive input; reset triggered if no transition occurs within 1.6 s |
| RST | Active-low reset output (push-pull) | Drives MCU reset pin low for ≥200 ms on power-up, brownout, or watchdog timeout |
| VCC | Main supply input | 3 V nominal system rail; powers internal circuitry and enables VOUT sourcing |
| VOUT | SRAM supply output | Switches between VCC and VBAT to maintain LPSRAM voltage during main power loss |
| VBAT | Backup battery input | Accepts 1.0–5.5 V battery; supplies VOUT when VCC < 2.4 V |
| VSS | Ground reference | Common return path for all internal functions and I/O pins |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset down to VCC = 1.0 V | Ensures valid reset signaling even during deep brownout conditions without battery |
| Automatic battery switchover at 2.4 V | Prevents SRAM data loss by switching VOUT to VBAT before VCC reaches critical level |
| Integrated 1.6 s watchdog timer | Eliminates need for external RC timing network and reduces BOM count |
| Low 0.4 µA battery supply current | Enables >10-year backup operation with standard CR2032 coin cell in typical use |
| Push-button reset with internal pull-up | Supports momentary switch interface without external resistor; MR pin self-biased |
Applications
| Industrial PLC Memory Backup | Smart Meter Data Retention |
|---|---|
|
Use Scenario: Maintaining SRAM contents during grid outages or battery replacement in programmable logic controllers. IC Role / Device Role / Timing Role: Supervisory IC providing VCC/VBAT switchover, reset generation, and power-fail warning to preserve volatile configuration data. Use Value: Enables zero-data-loss hot-swap of primary power sources while sustaining LPSRAM voltage above 2.0 V via VBAT. |
Use Scenario: Preserving tariff tables and consumption logs in utility meters during extended AC mains interruptions. IC Role / Device Role / Timing Role: Battery-backed supervisor asserting reset only on true brownout-not transient dips-and triggering PFO before VCC falls below 2.4 V. Use Value: Prevents corrupted EEPROM writes by halting MCU execution before supply collapse, using precise 2.63 V reset threshold. |
| Medical Infusion Pump Safety Monitoring | Automotive Body Control Module (BCM) |
|
Use Scenario: Ensuring fail-safe shutdown and memory retention in battery-powered infusion devices during power transitions. IC Role / Device Role / Timing Role: Dual-role supervisor: generates clean reset pulse on startup and monitors VCC for undervoltage faults during runtime. Use Value: Meets IEC 62304 Class C requirements via guaranteed 200 ms reset hold time and watchdog-enforced firmware liveness. |
Use Scenario: Managing non-volatile memory integrity and MCU reset coordination across multiple power domains in vehicle body electronics. IC Role / Device Role / Timing Role: Centralized power supervisor interfacing with MCU reset, SRAM backup, and battery management subsystems. Use Value: Reduces system-level complexity by integrating PFI/PFO, MR, WDI, and switchover into single SO8 package with industrial temp range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2T | Single reset output only; no watchdog, no PFI/PFO, no battery switchover | Limited to basic reset generation-cannot support LPSRAM backup or power-fail warning | Select when only VCC monitoring and reset are required; lower cost but reduced feature set |
| TPS3808G12DBVR | Adjustable reset threshold (1.2–5.5 V); no battery switchover or PFI/PFO | Requires external components for SRAM backup; lacks integrated power-fail detection | Choose for flexible threshold tuning in multi-rail systems, but adds design overhead for backup functionality |
Compared with MAX809TRD2T and TPS3808G12DBVR, STM802TM6F uniquely integrates battery switchover, watchdog, and power-fail comparator in one SO8 package-enabling complete power supervision for LPSRAM-based systems without external circuitry.
Availability
STM802TM6F is available at Aetrix Electronics and suitable for industrial PLCs, smart metering systems, medical infusion pumps, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for STM802TM6F 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 sensor solutions for industrial, automotive, and consumer markets.
The STM690/704/795/802/804/805/806 family was engineered specifically for robust microprocessor supervision in battery-backed memory systems-emphasizing low-power operation, precise voltage thresholds, and seamless VCC/VBAT handover.
FAQ
What is the function of the Vccsw pin on STM802TM6F?
Vccsw is a push-pull output that signals the VOUT switchover state: high when VOUT is sourced from VBAT, low when sourced from VCC. It can drive the gate of an external PMOS transistor to extend VOUT current capability beyond the internal 75 mA limit, enabling higher-load LPSRAM configurations.
Can STM802TM6F operate without a backup battery?
Yes. When no battery is used, connect both VBAT and VOUT to VCC. The device functions fully as a supervisor-providing reset, watchdog, and power-fail detection-with guaranteed RST assertion down to VCC = 1.0 V and no reliance on external backup power.
How does the watchdog timer interact with the manual reset (MR) input?
The watchdog timer is disabled while reset is asserted-either by MR low or VCC falling below VRST. When MR returns high, the internal trec timer begins, and the watchdog resumes counting only after reset de-asserts. Thus, MR overrides watchdog behavior during active reset.
Is STM802TM6F compatible with 5 V systems?
No. STM802TM6F is specified for 3 V operation only, with absolute maximum VCC = 6.0 V but functional operation limited to 2.7–3.6 V. For 5 V systems, ST offers the STM809 series (e.g., STM809R) with 4.63 V reset threshold and matching SO8 footprint.
STM802TM6F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.075V
- 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:
- 8-SOIC
STM802TM6F FAQ
1.How can I place an order for STM802TM6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM802TM6F 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 STM802TM6F reliable?
The price and inventory of STM802TM6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM802TM6F is usually 5 days.
3.What payment methods are accepted for STM802TM6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM802TM6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM802TM6F?
STM802TM6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM802TM6F 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 STM802TM6F?
For technical support, including STM802TM6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM802TM6F requirements.
6.How does Aetrix verify that STM802TM6F is sourced from the original manufacturer or authorized distributors?
All STM802TM6F 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 STM802TM6F meets industry standards.
7.What is the process for return or replacement of STM802TM6F?
All STM802TM6F units undergo pre-shipment inspection (PSI). If there is an issue with STM802TM6F, 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 STM802TM6F part is unused and in its original packaging.
Return procedure for STM802TM6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM802TM6F Tags
-
MIC826SYMT-TR
Microchip Technology
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APX803L20-29SA-7
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