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STMicroelectronics STM802TM6E
- Part No.:
- STM802TM6E
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
STM802TM6E.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,795
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Product details
Overview
STM802TM6E from STMicroelectronics is a 3 V industrial-grade 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 supports external LPSRAM backup via VOUT switching between VCC and VBAT. Used in embedded controllers requiring reliable power monitoring and non-volatile SRAM retention during brownout.
For engineers reviewing the STM802TM6E datasheet, STM802TM6E pinout, STM802TM6E application, or STM802TM6E equivalent, key selection criteria include guaranteed reset below 1.0 V, 200 ms typical reset timeout (trec), 0.4 µA typical battery supply current, push-pull RST output, and compatibility with 3 V systems requiring battery-backed memory supervision.
Technical Context
The STM802 implements a precision voltage reference and comparator to monitor VCC against VRST (2.63 V typ); reset remains asserted until VCC exceeds VRST + hysteresis and trec (200 ms typ) elapses. Its internal watchdog timer triggers reset if WDI remains static for ≥1.6 s, cleared only by edge transitions or active reset.
VOUT automatically switches from VCC to VBAT when VCC falls below VSW (2.4 V), enabling seamless LPSRAM backup; Vccsw provides a push-pull indicator signal for external PMOS control. PFI/PFO delivers early power-fail warning with VPFI threshold at 2.5 V (typ), independent of VCC monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VRST) | 2.63 V (typ); ensures MCU reset before critical logic voltage margin loss in 3 V systems. |
| Reset Timeout (trec) | 200 ms (typ); guarantees sufficient hold time for full system initialization after power-up or recovery. |
| Watchdog Timeout (tWD) | 1.6 s (typ); detects MCU lockup without requiring software intervention or external timing components. |
| Battery Supply Current | 0.4 µA (typ); enables multi-year operation on coin-cell batteries during extended VCC outage. |
| Power-Fail Input Threshold (VPFI) | 2.5 V (typ); triggers PFO assertion before VCC drops below VRST, allowing preemptive data save. |
| Operating Temperature | –40 °C to +85 °C; qualified for industrial environments including factory automation and metering. |
| VCC Switchover Voltage (VSW) | 2.4 V (typ); defines precise transition point for VOUT switching from main supply to backup battery. |
Pinout & Package
STM802TM6E 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 with a dot or bevelled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | PFO | Push-pull power-fail output; goes low when PFI < 2.5 V or VCC < 2.4 V, signaling imminent supply collapse. |
| 2 | VOUT | Switched supply output; connects to VCC or VBAT depending on VCC level, powering external LPSRAM. |
| 3 | VCC | Main 3 V supply input; powers internal circuitry and sources VOUT when above VSW. |
| 4 | Vccsw | Push-pull VCC-switch indicator; high during battery backup mode, drives gate of external PMOS for >75 mA loads. |
| 5 | VSS | Ground reference; common return path for all internal functions and I/Os. |
| 6 | MR | Active-low manual reset input; asserts RST when pulled low, with internal 40 kΩ pull-up. |
| 7 | WDI | Watchdog input; requires edge transition every <1.6 s to prevent timeout-induced reset. |
| 8 | VBAT | Backup battery input; supplies VOUT when VCC falls below VSW, supports voltages exceeding VCC. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed Reset Below 1.0 V | Ensures deterministic reset assertion even during deep brownout, protecting MCU state integrity. |
| Automatic Battery Switchover | VOUT transitions from VCC to VBAT within 10 µs when VCC drops below 2.4 V, preserving SRAM data. |
| Integrated Power-Fail Comparator | PFI/PFO provides early warning at 2.5 V, enabling firmware-triggered save operations before reset occurs. |
| Low-Battery Quiescent Current | 0.4 µA (typ) draw from VBAT extends coin-cell life beyond 10 years in standby backup mode. |
| Manual Reset with Debounce Immunity | MR accepts direct switch-to-ground connection; no external RC required due to internal timing and noise filtering. |
Applications
| Industrial PLC Memory Backup | Smart Meter Data Retention |
|---|---|
|
Use Scenario: Programmable logic controller retains configuration and runtime variables in external LPSRAM during AC mains interruption. IC Role / Device Role / Timing Role: STM802TM6E monitors 3.3 V rail, asserts RST on undervoltage, and switches VOUT to backup battery to maintain SRAM voltage. Use Value: Prevents loss of calibration data and operational history during grid instability, meeting IEC 61000-4-11 immunity requirements. |
Use Scenario: Electricity meter preserves tariff schedules, consumption logs, and tamper flags across power outages lasting hours. IC Role / Device Role / Timing Role: Acts as dual-function supervisor: triggers MCU reset at 2.63 V and enables battery-backed SRAM via VOUT switchover at 2.4 V. Use Value: Achieves >10-year backup lifetime using CR2032 cell while supporting EN 13757-3 secure data logging. |
| Medical Infusion Pump Safety Monitoring | POS Terminal Transaction Integrity |
|
Use Scenario: Infusion pump maintains real-time dose tracking and alarm state in volatile memory during brief power dips. IC Role / Device Role / Timing Role: Provides watchdog supervision (1.6 s timeout) and brownout reset (200 ms trec) to force safe shutdown or restart. Use Value: Meets IEC 62304 Class B SW safety requirements by ensuring deterministic fault response without software dependency. |
Use Scenario: Point-of-sale terminal completes financial transaction writes to EEPROM before power loss during peak checkout load. IC Role / Device Role / Timing Role: Uses PFI/PFO to detect falling VCC 150 ms before reset threshold, triggering atomic commit sequence. Use Value: Eliminates transaction rollback risk by providing 2.5 V early-warning window aligned with EMVCo power-loss tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX691ACSA+ | Higher reset threshold (3.08 V), no watchdog timer, 12 µA quiescent current in backup mode. | Lacks watchdog supervision and ultra-low battery current; suitable only for static brownout detection. | Select when system requires higher reset voltage margin and does not need watchdog or long-term battery backup. |
| TPS3808G12DBVR | Adjustable reset threshold (via external resistor), no battery switchover or PFI/PFO, 2.5 µA supply current. | Cannot support LPSRAM backup or power-fail warning; designed for basic reset-only use cases. | Choose for cost-sensitive designs needing programmable reset voltage but no memory retention features. |
Compared with MAX691ACSA+ and TPS3808G12DBVR, STM802TM6E uniquely integrates battery switchover, watchdog, and power-fail comparator in a single 3 V supervisor-enabling robust data retention and fault recovery where alternatives require multiple discrete ICs or compromise on backup lifetime or early-warning capability.
Availability
STM802TM6E is available at Aetrix Electronics and suitable for industrial PLCs, smart meters, medical infusion pumps, and POS terminals requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for STM802TM6E 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.
STM802 belongs to ST's legacy supervisor IC product line, engineered specifically for 3 V embedded systems requiring deterministic reset behavior, battery-backed memory support, and power-fail warning in space-constrained industrial applications.
FAQ
What is the function of the Vccsw pin on STM802TM6E?
Vccsw is a push-pull output that goes high when VOUT switches to VBAT (battery backup mode) and low when VOUT reconnects to VCC. It is designed to drive the gate of an external PMOS transistor, enabling higher current (beyond the 75 mA internal limit) to external LPSRAM during backup operation.
Can STM802TM6E operate without a backup battery connected?
Yes. When no battery is used, VBAT and VOUT must both be connected to VCC. In this configuration, the device functions as a standard 3 V supervisor with reset, watchdog, and power-fail detection-but without battery switchover capability. All other features remain fully operational.
How does the watchdog timer interact with the manual reset (MR) input?
The watchdog timer is disabled while reset is asserted-either by MR being held low or by VCC dropping below VRST. Once MR returns high (or VCC recovers), the watchdog resumes counting from zero. A rising or falling edge on WDI clears the timer, preventing reset regardless of MR state.
Is the PFI input required for basic reset functionality?
No. PFI is optional and can be tied to ground if unused. The core reset function depends solely on VCC monitoring and MR input. PFI enables the power-fail comparator feature (PFO output), which provides early warning but is not needed for reset generation or battery switchover.
STM802TM6E 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:
- 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
STM802TM6E FAQ
1.How can I place an order for STM802TM6E through Aetrix?
Please submit a Request for Quotation (RFQ) for STM802TM6E 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 STM802TM6E reliable?
The price and inventory of STM802TM6E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM802TM6E is usually 5 days.
3.What payment methods are accepted for STM802TM6E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM802TM6E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM802TM6E?
STM802TM6E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM802TM6E 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 STM802TM6E?
For technical support, including STM802TM6E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM802TM6E requirements.
6.How does Aetrix verify that STM802TM6E is sourced from the original manufacturer or authorized distributors?
All STM802TM6E 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 STM802TM6E meets industry standards.
7.What is the process for return or replacement of STM802TM6E?
All STM802TM6E units undergo pre-shipment inspection (PSI). If there is an issue with STM802TM6E, 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 STM802TM6E part is unused and in its original packaging.
Return procedure for STM802TM6E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM802TM6E Tags
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MIC826SYMT-TR
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