My Inquiry
My Account
STMicroelectronics STM708TDS6E
- Part No.:
- STM708TDS6E
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
STM708TDS6E.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,305
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
STM708TDS6E from STMicroelectronics is a 3 V precision voltage supervisor IC with dual active-low and active-high 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 such as PLC controllers and embedded instrumentation.
For engineers reviewing the STM708TDS6E datasheet, STM708TDS6E pinout, STM708TDS6E application, or STM708TDS6E equivalent, key selection criteria include its dual-reset output architecture, absence of watchdog functionality (distinguishing it from STM706T/S/R), PFI threshold of 1.25 V ±1%, guaranteed reset assertion at VCC ≥ 1.0 V, and TSSOP8 package compatibility with space-constrained PCB layouts.
Technical Context
The STM708TDS6E implements independent voltage monitoring using two internal comparators: one for VCC supervision (VRST = 3.00–3.15 V) and another for power-fail detection (VPFI = 1.25 V). It features push-pull RST and RST outputs with trec = 200 ms (typ.), and supports manual reset via MR with internal 40 kΩ pull-up.
Unlike STM706 variants, the STM708 series omits watchdog circuitry - confirmed by logic diagram Figure 2 and Table 1 - and includes NC on Pin 3 (SO8) / Pin 1 (TSSOP8), verified in Table 3 and Figures 5–6. Its PFO output remains high until PFI falls below VPFI, enabling early warning of supply collapse without requiring external timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Monitor Threshold | 3.00–3.15 V - ensures reliable reset assertion for 3.3 V systems experiencing 5% rail sag |
| Reset Timeout (trec) | 200 ms (typ.) - provides sufficient hold time for microcontroller initialization after power recovery |
| Power-Fail Threshold (VPFI) | 1.25 V ±1% - enables precise undervoltage detection on divided input rails before VCC drops below MCU minimum |
| Supply Current | 40 µA (typ.) - minimizes quiescent load in battery-backed or low-power always-on subsystems |
| Operating Temperature | –40 °C to +85 °C - certified for industrial-grade operation without derating |
| Reset Output Drive | Push-pull RST and RST - eliminates need for external pull-up/down resistors in most MCU interface configurations |
| VCC Minimum for Reset Assertion | 1.0 V - guarantees valid reset signal integrity even during deep brownout or capacitor discharge decay |
Pinout & Package
STM708TDS6E is housed in an 8-pin TSSOP package (3 × 3 mm body, DS suffix), pin-compatible with SO8 but offering 45% smaller footprint and improved thermal performance. Pin assignments are validated per Figure 6 and Table 3 of DocID10518 Rev 14.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PFO) | Power-fail output | Push-pull active-low signal indicating PFI < VPFI; can drive MR directly for autonomous power-collapse reset |
| 2 (RST) | Active-high reset output | Asserted high when VCC < VRST or MR low; compatible with MCUs requiring active-high reset assertion |
| 3 (NC) | No connect | Unbonded die pad; must remain floating - no routing or soldering permitted |
| 4 (VCC) | Supply input | Primary 3 V power rail connection; requires local 0.1 µF decoupling per Figure 9 |
| 5 (PFI) | Power-fail input | Analog input referenced to VPFI; typically connected via resistor divider to unregulated supply for predictive fail detection |
| 6 (MR) | Manual reset input | Active-low with internal 40 kΩ pull-up; debounced by trec timer - no external RC needed |
| 7 (RST) | Active-low reset output | Asserted low during VCC fault or MR assertion; meets TTL/CMOS logic thresholds across full temperature range |
| 8 (VSS) | Ground reference | System ground return path; must be low-impedance and adjacent to VCC decoupling capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | RST (active-low) and RST (active-high) eliminate level-shifting requirements for mixed-logic-system interfacing |
| Guaranteed reset down to VCC = 1.0 V | Ensures deterministic system halt during deep brownout, preventing corrupted memory writes or state machine lockup |
| Integrated power-fail comparator | VPFI = 1.25 V ±1% enables accurate early-warning detection without external reference or op-amp circuitry |
| No watchdog timer | Reduces BOM count and firmware complexity in applications where software watchdog management is unnecessary or handled externally |
| TSSOP8 package (3 × 3 mm) | Enables high-density layout in space-constrained industrial controllers and portable instrumentation |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Monitors 3.3 V supply rail in a DIN-rail mounted programmable logic controller exposed to wide ambient temperature swings and electrical noise. IC Role / Device Role / Timing Role: Primary VCC supervisor asserting both RST and RST to ARM Cortex-M7 MCU and FPGA configuration logic during brownout events. Use Value: Dual-output architecture allows simultaneous reset of heterogeneous logic domains without additional inverters or glue logic. |
Use Scenario: Embedded in a portable ultrasound imaging device requiring fail-safe power sequencing and battery-backed memory retention. IC Role / Device Role / Timing Role: Detects pre-failure condition on Li-ion charger output via PFI divider, triggering controlled shutdown before VCC collapse corrupts image buffer data. Use Value: VPFI = 1.25 V enables 12 ms advance warning at 5 V input (per Figure 22–23), allowing safe RAM dump to nonvolatile storage. |
| Smart Energy Meter | Factory Automation I/O Module |
Use Scenario: Supervises isolated 3.3 V domain powering metrology ADC and communication SoC in ANSI C12.20-compliant electricity meter. IC Role / Device Role / Timing Role: Ensures clean reset pulse (trec = 200 ms) after AC line interruption, preventing partial firmware execution during re-power-up. Use Value: Guaranteed RST assertion down to VCC = 1.0 V prevents metastability in isolation barrier drivers during slow capacitor discharge. |
Use Scenario: Mounted on modular digital input/output board operating in harsh EMI environments near motor drives and contactors. IC Role / Device Role / Timing Role: Provides noise-immune manual reset via MR switch and robust power-fail signaling to main controller over CAN bus. Use Value: Internal MR pull-up (40 kΩ) eliminates external bias resistor, reducing component count while maintaining >20 kV ESD immunity on reset line. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM706TDS6F | Includes watchdog timer (WDI/WDO); same VCC threshold and trec; RST only (no RST) | Required where firmware hang detection is mandatory (e.g., remote telemetry nodes) | Select if watchdog functionality is needed; otherwise STM708TDS6E reduces design complexity |
| MAX6361LUT+T | Single active-low reset; 2.93 V threshold; 140 ms trec; no PFI/PFO; SOT23-6 package | Suitable for cost-sensitive, single-rail consumer devices with minimal feature set | Choose only for ultra-low-cost, space-limited designs lacking power-fail monitoring needs |
Compared with STM706TDS6F, STM708TDS6E trades watchdog capability for dual-reset flexibility and PFI/PFO integration - making it optimal for industrial systems needing coordinated reset of multiple logic families and predictive power failure response, not just software crash recovery.
Availability
STM708TDS6E is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, smart energy meters, and factory automation I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for STM708TDS6E 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 specializing in automotive, industrial, and power management solutions, with over 45 years of analog and mixed-signal IC design expertise.
The STM70x supervisor family targets industrial and embedded control applications requiring high-reliability power monitoring, reset coordination, and predictive power-fail signaling - all in compact, RoHS-compliant packages.
FAQ
What is the function of Pin 3 (NC) on STM708TDS6E?
Pin 3 is a no-connect terminal - physically unbonded on the die and electrically isolated. It must remain unconnected on the PCB; routing traces or applying solder to this pin risks mechanical stress or unintended coupling. This NC designation is confirmed in Table 3 and Figure 6 of the official datasheet (DocID10518 Rev 14).
Can STM708TDS6E be used with a 5 V supply?
No - STM708TDS6E is specified only for 3 V operation (VCC = 2.7–3.6 V per DC characteristics Table 6). Applying 5 V exceeds absolute maximum rating (VCC ≤ 6.0 V) but violates recommended operating conditions, risking premature parametric drift, increased supply current, and unreliable reset threshold accuracy. Use STM708R or STM706R for 5 V systems.
How does the power-fail comparator interact with the reset outputs?
The PFI/PFO circuit operates independently of VCC monitoring: PFO goes low when PFI < 1.25 V, regardless of VCC status. To trigger system reset on power-fail, connect PFO to MR. This causes RST/RST assertion with full trec delay - unlike direct VCC brownout, which asserts reset immediately upon crossing VRST.
Is STM708TDS6E pin-compatible with STM706TDS6E?
No - STM706TDS6E includes WDI and WDO pins (Pins 8 and 7 in TSSOP8), while STM708TDS6E replaces them with NC (Pin 3) and repurposes Pin 7 as RST. Pin mapping differs per Figures 4 vs. 6 and Table 3; direct substitution would cause functional failure due to missing watchdog signals and incorrect reset output placement.
STM708TDS6E 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:
- 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-TSSOP
STM708TDS6E FAQ
1.How can I place an order for STM708TDS6E through Aetrix?
Please submit a Request for Quotation (RFQ) for STM708TDS6E 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 STM708TDS6E reliable?
The price and inventory of STM708TDS6E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM708TDS6E is usually 5 days.
3.What payment methods are accepted for STM708TDS6E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM708TDS6E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM708TDS6E?
STM708TDS6E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM708TDS6E 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 STM708TDS6E?
For technical support, including STM708TDS6E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM708TDS6E requirements.
6.How does Aetrix verify that STM708TDS6E is sourced from the original manufacturer or authorized distributors?
All STM708TDS6E 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 STM708TDS6E meets industry standards.
7.What is the process for return or replacement of STM708TDS6E?
All STM708TDS6E units undergo pre-shipment inspection (PSI). If there is an issue with STM708TDS6E, 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 STM708TDS6E part is unused and in its original packaging.
Return procedure for STM708TDS6E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM708TDS6E Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
