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STMicroelectronics STM707DS6F
- Part No.:
- STM707DS6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
STM707DS6F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,238
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Product details
Overview
STM707DS6F from STMicroelectronics is a 5 V precision voltage supervisor IC with dual reset outputs (active-low RST and active-high RST), power-fail comparator (PFI/PFO), manual reset input (MR), and no watchdog timer. It monitors VCC for out-of-tolerance conditions with a reset threshold of 4.50 V to 4.75 V, guarantees RST assertion down to VCC = 1.0 V, and features 200 ms typical reset timeout (trec). It is used in industrial microcontroller systems requiring reliable power-on and brownout reset signaling.
For engineers reviewing the STM707DS6F datasheet, STM707DS6F pinout, STM707DS6F application, or STM707DS6F equivalent, key selection considerations include its dual-polarity reset outputs, absence of watchdog functionality (distinguishing it from STM705/706), PFI/PFO early power-fail detection capability, and guaranteed reset assertion at low VCC - critical for robust MCU boot sequencing and supply monitoring.
Technical Context
The STM707DS6F implements a precision bandgap-based voltage reference and dual comparators: one for VCC monitoring (VRST = 4.50–4.75 V) and another for independent power-fail detection (VPFI ≈ 1.25 V). Its logic diagram shows separate RST and RST outputs driven by the same VCC monitor but with complementary polarity, enabling direct interface to MCUs with either active-low or active-high reset inputs.
No internal watchdog timer is present - unlike STM705/706/813L - eliminating WDI/WDO pins and simplifying reset control in systems where software watchdog supervision is handled externally. The MR input includes an internal 40 kΩ pull-up, supporting TTL/CMOS-compatible manual reset triggering without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Voltage | 5 V nominal; supports stable operation across full industrial temperature range (−40 °C to +85 °C). |
| Reset Threshold (VRST) | 4.50 V to 4.75 V; precise window ensures reliable detection of 5 V supply brownout before MCU functional failure. |
| Reset Timeout (trec) | 200 ms typical; guarantees minimum reset pulse width during power-up and recovery, meeting most MCU requirements. |
| Supply Current | 40 µA typical; ultra-low quiescent current minimizes impact on standby power in battery-backed or energy-sensitive systems. |
| RST Assertion Range | Guaranteed down to VCC = 1.0 V; maintains valid reset state through deep undervoltage, preventing spurious MCU execution. |
| Power-Fail Threshold (VPFI) | ≈1.25 V (typ); fixed internal reference enables early warning of supply collapse via external resistor divider on PFI. |
| Operating Temperature | −40 °C to +85 °C; qualified for industrial-grade applications with no automotive option (unlike STM706). |
Pinout & Package
STM707DS6F is housed in an 8-pin TSSOP package (3 mm × 3 mm body, DS suffix per ST's ordering scheme), optimized for space-constrained PCB layouts while maintaining standard SOIC footprint compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – PFO | Power-fail output | Active-low push-pull output asserting when PFI falls below VPFI; provides early warning of supply decay. |
| 2 – PFI | Power-fail input | Analog input referenced to internal 1.25 V comparator; connected via external divider to unregulated rail or VCC for predictive fail detection. |
| 3 – NC | No connect | Unbonded pin; must remain floating - no electrical connection or routing required. |
| 4 – RST | Active-low reset output | Push-pull output asserted low during VCC undervoltage or MR activation; directly drives standard active-low MCU reset pins. |
| 5 – VCC | Supply voltage input | 5 V main power input; powers all internal circuitry and defines reset threshold reference point. |
| 6 – MR | Manual reset input | Active-low input with internal 40 kΩ pull-up; triggers reset on logic low; debounced internally - no external capacitor needed. |
| 7 – RST | Active-high reset output | Push-pull output asserted high during valid VCC; enables direct interface to MCUs requiring active-high reset assertion. |
| 8 – VSS | Ground | Reference return path for all internal comparators, outputs, and bias circuits; must be low-impedance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity reset outputs | RST (active-low) and RST (active-high) simultaneously available - eliminates need for external inverters in mixed-reset-interface systems. |
| Guaranteed reset down to 1.0 V VCC | Ensures deterministic MCU reset behavior even during severe brownout or partial power loss, improving system reliability. |
| Independent power-fail comparator | VPFI ≈ 1.25 V reference allows early detection of supply collapse before VCC drops below VRST - enables graceful shutdown or data save. |
| Low-quiescent-current design | 40 µA typical supply current reduces load on power rails and extends battery life in always-on monitoring applications. |
| Industrial temperature grade | −40 °C to +85 °C operation validated across process corners - suitable for factory automation, motor control, and embedded industrial equipment. |
Applications
| Industrial PLC Controller | Smart Energy Meter |
|---|---|
|
Use Scenario: Monitors 5 V system rail in programmable logic controller CPU module during mains fluctuation or backup battery switchover. IC Role / Device Role / Timing Role: Precision VCC supervisor providing synchronized active-low and active-high reset pulses to ARM Cortex-M7 MCU and FPGA configuration logic. Use Value: Dual RST outputs eliminate level-shifting components; guaranteed 1.0 V assertion prevents MCU lockup during brownout recovery. |
Use Scenario: Detects impending AC-to-DC converter failure in utility-grade electricity meter before VCC collapses below MCU operating voltage. IC Role / Device Role / Timing Role: Power-fail comparator (PFI/PFO) triggers non-volatile memory write and real-time clock hold prior to main supply dropout. Use Value: 1.25 V VPFI reference enables ~10–15 ms advance warning versus VCC threshold alone - sufficient time for EEPROM commit and RTC freeze. |
| Medical Diagnostic Interface | Automated Test Equipment (ATE) |
|
Use Scenario: Ensures clean power-on reset and brownout recovery for isolated communication interface (RS-485/USB) in portable ultrasound device. IC Role / Device Role / Timing Role: Supervises isolated 5 V DC-DC output feeding microcontroller and analog front-end; MR pin tied to service button. Use Value: 200 ms trec meets IEC 60601-1 reset timing requirements; low 40 µA current supports long battery standby between diagnostics sessions. |
Use Scenario: Provides deterministic reset sequencing for multi-processor ATE mainframe during power cycling and thermal stress testing. IC Role / Device Role / Timing Role: Generates simultaneous reset signals to host processor, FPGA, and calibration DACs using both RST and RST outputs. Use Value: No watchdog logic avoids false triggers during controlled firmware reboots; dual outputs simplify board-level reset tree design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM706DS6F | Includes watchdog timer (WDI/WDO), VRST = 4.25–4.50 V, same package and pinout except WDI/WDO replace NC/RST. | Required where software watchdog supervision is needed alongside reset; not drop-in due to different reset threshold and added watchdog pins. | Select STM706DS6F only if watchdog functionality is mandatory and system can accommodate lower VRST and extra watchdog signal routing. |
| MAX809SEUR+T | Single active-low reset output, VRST = 4.63 V (±1%), no PFI/PFO, no MR, SOT-23-3 package. | Suitable for cost-optimized, space-constrained designs needing basic reset only - lacks dual outputs, power-fail, and manual reset. | Choose MAX809SEUR+T for minimal BOM count and footprint where advanced features (PFI, MR, dual RST) are unnecessary. |
Compared with STM706DS6F, STM707DS6F trades watchdog capability for tighter integration of dual reset polarity and power-fail detection in the same 8-pin TSSOP; versus MAX809SEUR+T, it delivers significantly higher functional density and system-level supervision features at modest area premium.
Availability
STM707DS6F is available at Aetrix Electronics and suitable for industrial PLC controllers, smart energy meters, medical diagnostic interfaces, and automated test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for STM707DS6F 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 microcontrollers, power management ICs, sensors, and analog/mixed-signal devices for industrial, automotive, and consumer markets.
The STM70x family was developed specifically for robust, low-power microprocessor supervision in industrial environments - emphasizing precision threshold accuracy, guaranteed low-VCC reset behavior, and integrated power-fail warning without external components.
FAQ
Does STM707DS6F include a watchdog timer?
No. STM707DS6F does not contain a watchdog timer or related WDI/WDO pins. This distinguishes it from STM705/706/813L variants. Its function set is limited to VCC monitoring, dual reset generation, manual reset input, and power-fail detection - making it ideal for systems where watchdog supervision is implemented separately in firmware or external logic.
What is the purpose of the NC pin on STM707DS6F?
Pin 3 is designated NC (No Connect) and is internally unbonded. It must remain unconnected on the PCB - neither routed nor terminated. This pin exists for mechanical compatibility with other members of the STM70x family (e.g., STM705 uses this pin as WDO) but carries no electrical function in the STM707DS6F.
Can PFO be used to trigger a system reset?
Yes. Although STM707DS6F lacks a dedicated watchdog output, PFO can be connected to the MR pin to generate a reset when PFI falls below VPFI. This requires external design: PFI is biased via a resistor divider from the monitored supply, and PFO → MR creates a power-fail-initiated reset - useful for initiating controlled shutdown before VCC crosses VRST.
How does STM707DS6F differ from STM706DS6F in pin compatibility?
STM707DS6F and STM706DS6F share identical 8-pin TSSOP packaging and pin numbering, but differ electrically: STM706DS6F replaces NC (Pin 3) with WDI and RST (Pin 4) with WDO, while STM707DS6F uses Pin 3 as NC and Pin 4 as RST. Thus, they are not pin-compatible - PCB layout must match the specific variant's pin function map.
STM707DS6F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- 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-TSSOP
STM707DS6F FAQ
1.How can I place an order for STM707DS6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM707DS6F 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 STM707DS6F reliable?
The price and inventory of STM707DS6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM707DS6F is usually 5 days.
3.What payment methods are accepted for STM707DS6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM707DS6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM707DS6F?
STM707DS6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM707DS6F 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 STM707DS6F?
For technical support, including STM707DS6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM707DS6F requirements.
6.How does Aetrix verify that STM707DS6F is sourced from the original manufacturer or authorized distributors?
All STM707DS6F 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 STM707DS6F meets industry standards.
7.What is the process for return or replacement of STM707DS6F?
All STM707DS6F units undergo pre-shipment inspection (PSI). If there is an issue with STM707DS6F, 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 STM707DS6F part is unused and in its original packaging.
Return procedure for STM707DS6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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