My Inquiry
My Account
STMicroelectronics STM706TM6E
- Part No.:
- STM706TM6E
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
STM706TM6E.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,793
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
STM706TM6E from STMicroelectronics is a precision 3 V supply voltage supervisor IC with active-low reset (RST), watchdog timer, manual reset input (MR), and power-fail comparator (PFI/PFO). It asserts reset when VCC drops below 3.00 V (typ. 3.08 V), guarantees RST assertion down to VCC = 1.0 V, features 200 ms reset timeout (trec), and draws only 40 µA typical supply current - used in industrial microcontroller systems requiring reliable power-on and brownout detection.
For engineers reviewing the STM706TM6E datasheet, STM706TM6E pinout, STM706TM6E application, or STM706TM6E equivalent, key selection criteria include reset threshold accuracy (±2.5% over temperature), push-pull RST/RST outputs, WDO watchdog output compatibility with MR feedback, PFI threshold stability (1.25 V ±1.2%), and SO8 package compatibility with legacy PCB footprints.
Technical Context
The STM706TM6E integrates a precision bandgap reference, dual independent comparators (VCC vs. VRST and PFI vs. VPFI), a 1.6 s watchdog timer with edge-triggered WDI clearing, and trec timing circuitry. Its RST output remains asserted for ≥200 ms after VCC recovery or MR release, and it supports bi-directional MCU reset pin interfacing via external series resistor.
It operates across –40 °C to +85 °C with guaranteed RST assertion down to VCC = 1.0 V, uses internal 40 kΩ MR pull-up, and provides push-pull WDO and PFO outputs - enabling direct connection to MR for autonomous power-fail-induced reset without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VRST) | 3.00 V ≤ VRST ≤ 3.15 V - ensures reliable reset assertion before 3 V MCU brownout (e.g., ARM Cortex-M0+ at 3.0 V min). |
| Reset Timeout (trec) | 200 ms (typ.) - meets minimum reset pulse width requirements for most 8/16/32-bit MCUs (e.g., STM32, PIC, MSP430). |
| Watchdog Timeout | 1.6 s (typ.) - provides sufficient time for firmware watchdog service while detecting lockup within safe system response window. |
| Supply Current | 40 µA (typ.) - enables use in always-on monitoring circuits without compromising battery or low-power system budget. |
| Power-Fail Threshold (VPFI) | 1.25 V ±1.2% - allows precise early warning of VCC decay using external resistive divider (e.g., detect 4.5 V rail drop 10 ms before 3.0 V failure). |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial-grade embedded control applications (PLCs, motor drives, instrumentation). |
| VCC Range | 1.0 V to 5.5 V - supports operation during deep brownout and compatibility with 3.3 V/5 V systems. |
Pinout & Package
STM706TM6E is housed in an 8-pin SOIC (SO8) package with 150 mil body width, RoHS-compliant lead-free finish, and standard JEDEC MS-012AC footprint - compatible with automated SMT assembly and legacy board layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PFO) | Power-fail output | Push-pull active-low signal indicating PFI < VPFI; can drive MR directly to trigger early reset on power decay. |
| 2 (RST) | Active-high reset output | Not used on STM706T variant; STM706TM6E is T-version → RST is active-low; this pin is NC (no connect) per datasheet Table 3. |
| 3 (WDO) | Watchdog output | Push-pull active-low output triggered after 1.6 s WDI inactivity; connects to MR to convert watchdog timeout into system reset. |
| 4 (VCC) | Supply voltage input | Primary power rail monitoring point; device monitors this pin for reset condition and powers internal circuitry (1.0–5.5 V range). |
| 5 (PFI) | Power-fail input | Analog input compared to 1.25 V internal reference; typically tied to resistor divider from unregulated supply for predictive undervoltage detection. |
| 6 (MR) | Manual reset input | Active-low input with 40 kΩ internal pull-up; debounced by trec timer - no external RC needed for push-button reset. |
| 7 (RST) | Active-low reset output | Push-pull output asserted low during VCC undervoltage, MR low, or WDO-triggered reset; holds low ≥200 ms after recovery. |
| 8 (WDI) | Watchdog input | Edge-sensitive input (50 ns min pulse); toggling clears 1.6 s timer - used for periodic firmware "kick" to prevent spurious reset. |
Key Features
| Feature | Design Value |
|---|---|
| Precision VCC monitor | 3.00–3.15 V reset threshold with ±2.5% tolerance over –40 °C to +85 °C - eliminates need for external voltage reference in 3 V systems. |
| Dual reset outputs | RST (active-low) and RST (active-high) pins - enables flexible interface to MCUs requiring either polarity (STM706TM6E uses RST only; RST is NC). |
| Integrated watchdog timer | 1.6 s timeout with edge-triggered WDI clearing - detects firmware hang without external timer IC or GPIO overhead. |
| Power-fail comparator | Dedicated 1.25 V VPFI reference independent of VRST - allows separate early-warning detection of supply decay before VCC reaches reset threshold. |
| Low-voltage reset guarantee | RST asserted down to VCC = 1.0 V - ensures deterministic reset behavior during severe brownout, critical for flash write protection. |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Main CPU power sequencing and brownout recovery in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Primary VCC supervisor asserting RST to ARM Cortex-M7 during 24 V DC supply ripple or transient dropout. Use Value: 200 ms trec ensures full MCU core and peripheral initialization; PFI/PFO enables predictive shutdown before EEPROM corruption. |
Use Scenario: Power integrity monitoring in portable ultrasound imaging unit with battery + DC-DC backup. IC Role / Device Role / Timing Role: Dual-role supervisor - VCC monitor for 3.3 V FPGA domain and PFI-based early warning for 12 V analog front-end decay. Use Value: 40 µA quiescent current extends battery runtime; 1.25 V VPFI allows 50 ms advance warning before 3.3 V rail collapse. |
| Smart Energy Meter | Factory Automation HMI |
Use Scenario: Tamper-resistant reset management in IEC 62056-compliant electricity meter with isolated RS-485 and metrology SoC. IC Role / Device Role / Timing Role: Watchdog-enforced firmware health check (WDI toggled by metrology task) plus MR-driven secure factory reset. Use Value: WDO-to-MR feedback loop converts watchdog timeout into hard reset - prevents persistent fault states during EMI exposure. |
Use Scenario: Reliable boot supervision for ARM-based human-machine interface running Linux on i.MX6ULL. IC Role / Device Role / Timing Role: Reset coordination between PMIC, DDR memory, and application processor during cold start and power-cycle events. Use Value: Guaranteed RST assertion down to VCC = 1.0 V prevents partial initialization and bus contention during slow-ramp 3.3 V supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US31D3+ | 3.08 V reset threshold, 200 ms trec, no watchdog or PFI - single-function reset-only IC. | Lacks WDO and PFI functionality; suitable only where watchdog and predictive power-fail detection are unnecessary. | Select when BOM simplification and cost reduction outweigh need for watchdog/PFI features. |
| TPS3808G33DBVR | 3.3 V reset threshold (not 3.0 V), 200 ms trec, no WDO, includes PFI but no PFO - requires external transistor for power-fail reset generation. | Higher threshold risks missing early brownout; PFI-only requires added components to generate reset on power decay. | Choose only if system operates strictly at 3.3 V nominal and external reset logic is acceptable. |
Compared with MAX6326US31D3+ and TPS3808G33DBVR, STM706TM6E uniquely integrates 3.0 V precision reset, 1.6 s watchdog, and push-pull PFO in one SO8 package - eliminating discrete logic and reducing PCB area by >30% in multi-feature supervisor designs.
Availability
STM706TM6E 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 STM706TM6E 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 devices for industrial, automotive, and consumer markets.
STM706 is part of ST's legacy supervisor product line targeting cost-sensitive, high-reliability embedded systems - engineered specifically for robust power monitoring in space-constrained industrial and instrumentation applications.
FAQ
What is the function of the WDO pin on STM706TM6E?
The WDO (Watchdog Output) pin is a push-pull active-low output that goes low after 1.6 s of inactivity on WDI. It remains low until WDI receives a rising or falling edge or MR is asserted. WDO is designed to connect directly to MR, converting watchdog timeout into a system reset - no external components required.
Can STM706TM6E monitor a 5 V supply?
Yes. STM706TM6E operates from VCC = 1.0 V to 5.5 V and monitors its own VCC pin. When powered from 5 V, its 3.00–3.15 V reset threshold still applies - meaning it will assert RST if the 5 V rail drops to ~3.08 V. This makes it suitable for supervising 5 V systems experiencing brownout, not overvoltage.
How does the PFI/PFO feature provide early power-fail warning?
PFI compares an external voltage (e.g., from a resistor divider on the unregulated input) to a fixed 1.25 V internal reference. When PFI falls below 1.25 V, PFO goes low - signaling impending failure *before* VCC reaches the 3.08 V reset threshold. This allows firmware to save state or initiate controlled shutdown 5–20 ms earlier than RST assertion.
Is STM706TM6E pin-compatible with other STM706 variants?
Yes - all STM706x variants (T/S/R/P) share identical SO8 and TSSOP8 pinouts per datasheet Figures 3–4 and Table 3. STM706TM6E (T-version) uses RST (pin 7), WDO (pin 3), and leaves RST (pin 2) unconnected; swapping to STM706RM6E (R-version) would repurpose pin 2 as active-low RST and disable WDO, requiring minor schematic update.
STM706TM6E 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:
- 3.08V
- 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
STM706TM6E FAQ
1.How can I place an order for STM706TM6E through Aetrix?
Please submit a Request for Quotation (RFQ) for STM706TM6E 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 STM706TM6E reliable?
The price and inventory of STM706TM6E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM706TM6E is usually 5 days.
3.What payment methods are accepted for STM706TM6E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM706TM6E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM706TM6E?
STM706TM6E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM706TM6E 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 STM706TM6E?
For technical support, including STM706TM6E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM706TM6E requirements.
6.How does Aetrix verify that STM706TM6E is sourced from the original manufacturer or authorized distributors?
All STM706TM6E 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 STM706TM6E meets industry standards.
7.What is the process for return or replacement of STM706TM6E?
All STM706TM6E units undergo pre-shipment inspection (PSI). If there is an issue with STM706TM6E, 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 STM706TM6E part is unused and in its original packaging.
Return procedure for STM706TM6E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM706TM6E 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 and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
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…
