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STMicroelectronics STM806RM6E
- Part No.:
- STM806RM6E
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
STM806RM6E.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,657
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Product details
Overview
STM806RM6E from STMicroelectronics is a 3 V industrial-grade microprocessor supervisory IC with manual reset input (MR), active-low push-pull RST output, power-fail comparator (PFI/PFO), and automatic battery switchover for external LPSRAM backup. It guarantees RST assertion down to VCC = 1.0 V, features 200 ms typical reset timeout (trec), operates from –40 °C to +85 °C, and draws only 40 µA typical supply current - used in embedded systems requiring reliable power monitoring and non-volatile SRAM retention during brownout.
For engineers reviewing the STM806RM6E datasheet, STM806RM6E pinout, STM806RM6E application, or STM806RM6E equivalent, key selection criteria include its MR-triggered reset behavior, dual-supply switchover logic (VCC/VBAT → VOUT), PFI threshold accuracy (VPFI = 2.63 V typ), and absence of watchdog functionality - distinguishing it from STM690/802/804/805 variants.
Technical Context
The STM806 implements a precision voltage monitor with a dedicated reset comparator referenced to VRST = 2.63 V (typ), asserting RST low when VCC falls below this threshold or when MR is pulled low. Its internal trec generator ensures minimum 200 ms reset pulse width after power-up recovery or MR release.
It integrates a power-fail comparator (PFI/PFO) with VPFI = 2.63 V (typ) and 100 mV hysteresis, plus an automatic battery switchover circuit that connects VBAT to VOUT when VCC drops below VSW = 2.4 V - enabling seamless LPSRAM backup without external control logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VRST) | 2.63 V (typ); guarantees RST assertion until VCC rises ≥2.63 V + hysteresis |
| Reset Timeout (trec) | 200 ms (typ); minimum duration RST remains asserted after VCC recovery or MR release |
| Power-Fail Threshold (VPFI) | 2.63 V (typ); triggers PFO low when PFI < VPFI or VCC < 2.4 V (VSW) |
| Supply Current (ICC) | 40 µA (typ); enables low-power operation in always-on monitoring circuits |
| Battery Supply Current (IBAT) | 0.4 µA (typ); minimizes backup battery drain during extended VCC outage |
| Operating Temperature | –40 °C to +85 °C; qualified for industrial environments without derating |
| VCC Switchover Voltage (VSW) | 2.4 V; initiates automatic VBAT-to-VOUT connection when main supply drops below this level |
Pinout & Package
STM806RM6E is housed in an 8-pin SO8 (Small Outline Integrated Circuit) package, measuring 4.9 mm × 3.9 mm × 1.75 mm, with 1.27 mm lead pitch and gull-wing leads compatible with standard reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: PFO | Power-fail output | Push-pull output asserted low when PFI < VPFI or VCC < VSW; drives interrupt or flag logic |
| 2: VOUT | Supply output for LPSRAM | Switched output connected to VCC (via P-MOSFET) above VSW, or to VBAT below VSW |
| 3: VCC | Main supply input | Primary 3 V system rail; powers internal circuitry and sources VOUT during normal operation |
| 4: RST | Active-low reset output | Push-pull output asserted low during reset condition; directly interfaces MCU reset pin |
| 5: VSS | Ground reference | Common return path for all internal functions and I/O; must be low-impedance |
| 6: MR | Manual reset input | Active-low input with 40 kΩ internal pull-up; debounced by trec timer - no external RC needed |
| 7: PFI | Power-fail input | Monitors auxiliary voltage rail; asserts PFO when falling below VPFI = 2.63 V (typ) |
| 8: VBAT | Backup battery input | Connects to coin cell or supercap; supplies VOUT when VCC drops below VSW = 2.4 V |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset assertion down to VCC = 1.0 V | Ensures valid reset signal even during deep brownout, critical for safe MCU shutdown |
| Automatic battery switchover at VSW = 2.4 V | Enables uninterrupted LPSRAM backup without software intervention or external switches |
| Integrated power-fail comparator (PFI/PFO) | Provides early warning of impending power loss with 2.63 V threshold and 100 mV hysteresis |
| 200 ms typ reset timeout (trec) | Meets JEDEC JESD78 requirements for minimum reset pulse width after power recovery |
| 0.4 µA typ battery supply current | Extends backup battery life to >10 years in typical coin-cell applications (CR2032) |
Applications
| Industrial PLC Controller | Smart Meter Data Logger |
|---|---|
|
Use Scenario: Maintains SRAM contents during grid voltage sags or meter battery replacement. IC Role / Device Role / Timing Role: Supervisory IC providing VCC/VBAT switchover to VOUT and asserting RST to halt CPU during undervoltage. Use Value: Prevents data corruption in EEPROM-backed log buffers by guaranteeing clean reset and continuous SRAM power. |
Use Scenario: Preserves time-stamped energy consumption records during AC mains interruption. IC Role / Device Role / Timing Role: Monitors VCC and triggers PFO to initiate flash write before power collapse; sustains VOUT from VBAT. Use Value: Enables deterministic last-write-before-failure using PFI threshold alignment with meter regulator dropout point. |
| Medical Infusion Pump | Point-of-Sale Terminal |
|
Use Scenario: Ensures therapy history and calibration data survive brief battery swaps or power glitches. IC Role / Device Role / Timing Role: Generates MR-synchronized reset and holds VOUT stable via VBAT during VCC interruption. Use Value: Meets IEC 62304 Class B requirement for deterministic state recovery after power anomaly. |
Use Scenario: Retains transaction buffer and encryption keys during AC outage or battery change. IC Role / Device Role / Timing Role: Uses PFO to signal host MCU of imminent power loss, allowing secure key flush before VCC collapse. Use Value: Supports PCI PTS v6.0 "power fail safe" requirement by coupling PFI to regulated 3.3 V rail upstream of DC-DC converter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM805RM6F | Active-high open-drain RST output; identical VRST, trec, PFI, and switchover specs | Requires external pull-up for RST; suited for systems needing active-high reset polarity | Select when MCU reset pin is active-high and tolerates open-drain drive |
| MAX809TRD3 | Single VCC monitor only; no PFI, no VBAT switchover, no MR input; 2.93 V reset threshold | Lacks battery backup and power-fail warning; suitable only for basic reset generation | Choose only if system uses separate battery management and does not require LPSRAM supervision |
Compared with STM806RM6E, STM805RM6F offers identical supervision functionality but with inverted reset polarity and open-drain drive, while MAX809TRD3 omits battery switchover and power-fail detection - making it unsuitable for SRAM backup-critical designs.
Availability
STM806RM6E is available at Aetrix Electronics and suitable for industrial PLC controllers, smart meter data loggers, medical infusion pumps, and point-of-sale terminals requiring stable component supply across extended product lifecycles.
Supply support for STM806RM6E 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 STM690/704/80x supervisor family targets robust power monitoring in resource-constrained embedded systems, emphasizing low quiescent current, guaranteed reset behavior under brownout, and integrated battery switchover for non-volatile memory retention.
FAQ
Does STM806RM6E include a watchdog timer?
No. The STM806RM6E explicitly excludes watchdog functionality, as confirmed in Section 2.3 of the datasheet ("Watchdog input (NOT available on STM704/795/806)"). Its supervision relies solely on VCC monitoring, MR input, and PFI detection - simplifying design where software-controlled watchdogs are already implemented.
What is the maximum load current supported on VOUT?
VOUT supports up to 75 mA continuous output current when sourced from VCC or VBAT, as specified in the "Typical Operating Characteristics" section (Figure 26–27) and confirmed by on-resistance curves (Figures 15–16). Exceeding this requires external PMOS switching driven by Vccsw.
Can VBAT exceed VCC without damage?
Yes. The datasheet states "VBAT may exceed VCC" (Section 1.1.11), and absolute maximum ratings list VBAT = –0.3 V to 6.0 V independent of VCC. The internal switchover MOSFET blocks reverse current, enabling safe use of higher-voltage backup sources like 3.6 V LiSOCl₂ cells.
Is external capacitor required on MR for noise immunity?
A 0.1 µF capacitor from MR to GND is recommended only in noisy environments or when MR is routed over long cables (Section 2.2). The internal 40 kΩ pull-up and trec-based debouncing eliminate need for external RC in standard PCB layouts - reducing BOM count and board space.
STM806RM6E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.625V
- 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
STM806RM6E FAQ
1.How can I place an order for STM806RM6E through Aetrix?
Please submit a Request for Quotation (RFQ) for STM806RM6E 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 STM806RM6E reliable?
The price and inventory of STM806RM6E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM806RM6E is usually 5 days.
3.What payment methods are accepted for STM806RM6E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM806RM6E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM806RM6E?
STM806RM6E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM806RM6E 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 STM806RM6E?
For technical support, including STM806RM6E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM806RM6E requirements.
6.How does Aetrix verify that STM806RM6E is sourced from the original manufacturer or authorized distributors?
All STM806RM6E 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 STM806RM6E meets industry standards.
7.What is the process for return or replacement of STM806RM6E?
All STM806RM6E units undergo pre-shipment inspection (PSI). If there is an issue with STM806RM6E, 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 STM806RM6E part is unused and in its original packaging.
Return procedure for STM806RM6E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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