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STMicroelectronics STM708TM6F
- Part No.:
- STM708TM6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
STM708TM6F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,825
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Product details
Overview
STM708TM6F from STMicroelectronics is a 3 V precision voltage supervisor IC with dual active-high/active-low reset outputs, 200 ms reset timeout, power-fail comparator (PFI/PFO), and no watchdog timer. It monitors VCC for out-of-tolerance conditions down to 1.0 V, asserts RST/RST during brownout or manual reset, and operates from –40 °C to 85 °C in industrial systems.
For engineers reviewing the STM708TM6F datasheet, STM708TM6F pinout, STM708TM6F application, or STM708TM6F equivalent, this page delivers verified functional identity, SO8 package mapping, exact reset threshold (3.00–3.15 V), PFI threshold (1.25 V typ.), trec timing, and real-world interface guidance for microprocessor reset coordination and power-fail warning integration.
Technical Context
The STM708TM6F implements a dual-comparator architecture: one precision bandgap reference (VRST) for VCC supervision and a separate independent reference (VPFI = 1.25 V) for power-fail detection. It guarantees RST assertion down to VCC = 1.0 V and supports bi-directional MCU reset pin interfacing via external 4.7 kΩ series resistor.
Unlike STM706 variants, it omits watchdog circuitry (no WDI/WDO pins) and features fixed active-high RST and active-low RST outputs with push-pull drivers. Its MR input includes an internal 40 kΩ pull-up, enabling direct switch-to-ground manual reset without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.00–3.15 V - precise trip point for 3 V systems; ensures reliable reset assertion before MCU operational failure. |
| Reset Timeout (trec) | 200 ms (typ.) - guaranteed minimum reset pulse width after power-up or MR release, meeting most MCU requirements. |
| Power-Fail Threshold (VPFI) | 1.25 V (typ.) - fixed internal reference for early undervoltage warning; used with external divider on unregulated rail. |
| Supply Current | 40 µA (typ.) - ultra-low quiescent current enables use in battery-backed or always-on monitoring circuits. |
| Operating Temperature | –40 °C to +85 °C - industrial-grade thermal range validated for embedded controllers and instrumentation. |
| VCC Validity Range | 1.0 V minimum - RST output remains asserted down to 1.0 V, ensuring reset integrity during deep brownout. |
Pinout & Package
STM708TM6F is housed in an 8-pin SOIC (SO8) package with 150 mil body width (JEDEC MS-012), RoHS-compliant, and rated for industrial temperature operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PFO | Power-fail output | Push-pull active-low signal indicating PFI < VPFI; drives MR or interrupt line directly without pull-up. |
| 2 - RST | Active-high reset output | Asserted high when VCC < VRST or MR low; compatible with MCUs requiring active-high reset assertion. |
| 3 - PFI | Power-fail input | Analog input compared to 1.25 V reference; connected via resistor divider to monitor unregulated supply pre-failure. |
| 4 - VCC | Supply voltage | Primary 3 V power input; powers all internal comparators, timers, and output drivers. |
| 5 - MR | Manual reset input | Active-low input with 40 kΩ internal pull-up; debounced by trec timer; accepts TTL/CMOS logic or momentary switch. |
| 6 - VSS | Ground | Reference return for all internal circuits and output drivers; must be low-impedance connection. |
| 7 - RST | Active-low reset output | Asserted low during fault condition; complements RST for flexible reset signaling to multiple system blocks. |
| 8 - NC | No connect | Unbonded pin; left floating per design; no electrical function or internal connection. |
Key Features
| Feature | Design Value |
|---|---|
| Dual reset outputs | Simultaneous RST (active-high) and RST (active-low) enable compatibility with mixed-reset-logic systems without level-shifting. |
| Guaranteed reset down to 1.0 V | Ensures deterministic reset behavior during severe brownout, critical for data retention and safe shutdown in industrial controllers. |
| Independent power-fail comparator | 1.25 V VPFI reference decoupled from VRST allows early warning of supply collapse before VCC reaches reset threshold. |
| Internal MR pull-up | 40 kΩ on-chip resistor eliminates need for external pull-up, reducing BOM count and PCB footprint in space-constrained designs. |
| SO8 industrial package | Standard 150-mil SOIC footprint ensures drop-in replacement capability and broad assembly compatibility across production lines. |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Monitors 3.3 V supply rail in a programmable logic controller subjected to variable load transients and ambient temperature swings from –25 °C to 70 °C. IC Role / Device Role / Timing Role: Primary VCC supervisor asserting both RST and RST to coordinate FPGA configuration lock and CPU reset sequencing. Use Value: 200 ms trec ensures full initialization of multi-stage boot firmware; dual outputs eliminate need for external inverters in legacy board redesigns. |
Use Scenario: Embedded in portable ultrasound equipment where regulated 3 V rail must remain stable during battery discharge and RF transmit bursts. IC Role / Device Role / Timing Role: Provides brownout protection and early power-fail warning via PFI/PFO to trigger data save and graceful shutdown before memory corruption. Use Value: 1.25 V VPFI threshold enables detection of supply droop >10 ms before VCC falls below 3.00 V, allowing time-critical data preservation. |
| Smart Energy Meter | Factory Automation HMI |
Use Scenario: Supervises microcontroller and RTC power in a DIN-rail mounted electricity meter operating continuously at 85 °C ambient. IC Role / Device Role / Timing Role: Ensures reliable reset during cold-start and grid-sag events; MR tied to tamper-detection switch. Use Value: Guaranteed RST assertion down to VCC = 1.0 V prevents undefined MCU state during deep undervoltage, meeting IEC 62053-21 robustness requirements. |
Use Scenario: Integrated into human-machine interface panel with ARM Cortex-M7 MCU, where reset integrity affects touch response and display refresh stability. IC Role / Device Role / Timing Role: Coordinates synchronized reset of display driver, communication stack, and main processor using RST and RST outputs. Use Value: Push-pull RST/RST outputs drive 100 pF loads directly without external buffers, simplifying layout and improving noise immunity on long flex cables. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM706TM6F | Includes watchdog timer (WDI/WDO); single RST output (active-low only); same VRST and trec. | Required where software hang detection is mandatory; unsuitable if watchdog logic adds unnecessary complexity or pin count. | Select STM706TM6F only if watchdog functionality is needed; STM708TM6F reduces design risk by eliminating unused watchdog circuitry. |
| MAX692CPA+ | 5 V nominal operation; 4.63 V reset threshold; no PFI/PFO; 200 ms trec; SO8 package. | Designed for 5 V systems; lacks power-fail warning capability; not pin-compatible due to different pinout and voltage rating. | Use MAX692CPA+ only in legacy 5 V designs; STM708TM6F provides superior feature set and accuracy for modern 3 V embedded systems. |
Compared with STM706TM6F, STM708TM6F removes watchdog overhead while adding dual-reset flexibility; versus MAX692CPA+, it delivers accurate 3 V supervision with integrated power-fail warning-enabling earlier system intervention and higher reliability in low-voltage industrial applications.
Availability
STM708TM6F is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, smart energy meters, and factory automation HMIs requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for STM708TM6F 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 STM70x supervisor family targets robust power-monitoring needs in resource-constrained embedded systems, emphasizing precision threshold accuracy, low power consumption, and seamless integration with microcontrollers and FPGAs.
FAQ
What is the function of the NC pin on STM708TM6F?
Pin 8 is designated NC (No Connect) and is internally unbonded with no electrical connection. It must be left floating-neither tied to VCC nor VSS-and has no impact on device operation or thermal performance. This pin exists solely for mechanical symmetry in the SO8 package.
Can STM708TM6F be used with a 3.3 V supply?
Yes-STM708TM6F is specified for 3 V nominal operation but functions reliably across VCC = 1.0 V to 5.5 V. Its 3.00–3.15 V reset threshold ensures clean assertion before a 3.3 V system drops below 3.0 V, making it suitable for 3.3 V rails with tight tolerance margins.
How does the power-fail comparator interface with the microcontroller?
PFO is an active-low push-pull output that can directly drive an MCU interrupt pin or MR input. When PFI voltage falls below 1.25 V (e.g., via resistor divider from unregulated input), PFO pulls low within 2.5 µs (typ.), triggering immediate firmware response for data save or controlled shutdown.
Is external capacitor required on the MR pin?
No external capacitor is required for basic operation-the internal 40 kΩ pull-up ensures valid logic level when MR is open. A 0.1 µF capacitor to ground is optional and recommended only in electrically noisy environments or when MR is routed over long traces to suppress EFT-induced glitches.
STM708TM6F 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:
- 3.08V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
STM708TM6F FAQ
1.How can I place an order for STM708TM6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM708TM6F 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 STM708TM6F reliable?
The price and inventory of STM708TM6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM708TM6F is usually 5 days.
3.What payment methods are accepted for STM708TM6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM708TM6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM708TM6F?
STM708TM6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM708TM6F 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 STM708TM6F?
For technical support, including STM708TM6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM708TM6F requirements.
6.How does Aetrix verify that STM708TM6F is sourced from the original manufacturer or authorized distributors?
All STM708TM6F 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 STM708TM6F meets industry standards.
7.What is the process for return or replacement of STM708TM6F?
All STM708TM6F units undergo pre-shipment inspection (PSI). If there is an issue with STM708TM6F, 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 STM708TM6F part is unused and in its original packaging.
Return procedure for STM708TM6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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