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STMicroelectronics STM804TM6E
- Part No.:
- STM804TM6E
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
STM804TM6E.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,628
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Product details
Overview
STM804TM6E from STMicroelectronics is a 3 V microprocessor supervisory IC with active-high open-drain reset output, automatic battery switchover, power-fail comparator (PFI/PFO), and manual reset input (MR). It guarantees RST assertion down to VCC = 1.0 V, features 200 ms typical reset timeout (trec), and draws only 40 µA typical supply current - enabling reliable system initialization and brownout protection in industrial embedded systems with external LPSRAM.
For engineers reviewing the STM804TM6E datasheet, STM804TM6E pinout, STM804TM6E application, or STM804TM6E equivalent, key selection criteria include its open-drain RST output logic, VCC switchover threshold at 2.4 V, PFI comparator reference of 1.25 V, watchdog absence (confirmed for STM804), and SO8 package compatibility with legacy board layouts.
Technical Context
The STM804 implements a precision voltage monitor with a fixed 2.4 V switchover threshold (VSW) and 1.25 V power-fail input threshold (VPFI), both referenced to internal bandgap. Its reset generator asserts RST for ≥200 ms after VCC recovery, MR release, or power-fail detection - with guaranteed timing across –40 °C to +85 °C.
Unlike STM690/802/805 variants, STM804 lacks watchdog functionality and chip enable gating. Its RST output is strictly active-high and open-drain (requiring external pull-up), while PFO is push-pull and Vccsw provides VCC-switch status for external PMOS control - supporting fail-safe SRAM backup without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Output Type | Active-high, open-drain RST - requires external pull-up for MCU reset signaling |
| VCC Switchover Threshold | 2.4 V (VSW) - triggers automatic VBAT-to-VOUT switch when main supply drops below this level |
| Power-Fail Input Threshold | 1.25 V (VPFI) - asserts PFO low when PFI falls below this reference, enabling early power-loss warning |
| Reset Timeout (trec) | 200 ms (typ) - minimum duration RST remains asserted after VCC recovery or MR release |
| Supply Current (ICC) | 40 µA (typ) - enables low-power operation during normal VCC regulation |
| Battery Supply Current | 0.4 µA (typ) - minimizes drain on backup battery during VBAT-only operation |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial-grade embedded applications |
Pinout & Package
STM804TM6E is housed in an 8-pin SO8 (Small Outline Integrated Circuit) package, compliant with JEDEC MS-012AC, with 1.27 mm pitch and surface-mount footprint. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN 1: PFO | Power-fail output | Push-pull output that goes low when PFI < 1.25 V or VCC < 2.4 V - used for system-level power-fail interrupt |
| PIN 2: VOUT | Supply output voltage | Switched output connected to VCC (via P-MOSFET) above 2.4 V, or to VBAT below 2.4 V - powers external LPSRAM |
| PIN 3: VCC | Main supply input | Primary 3 V system supply input; monitored for reset assertion and switchover control |
| PIN 4: RST | Active-high reset output | Open-drain output asserted high during reset - must be pulled up externally to interface with MCU reset pin |
| PIN 5: VSS | Ground | System ground reference for all internal comparators and outputs |
| PIN 6: MR | Manual reset input | Active-low input with internal 40 kΩ pull-up - debounced push-button reset without external RC |
| PIN 7: PFI | Power-fail input | Analog input monitoring auxiliary rail or divided VCC; compared against 1.25 V internal reference |
| PIN 8: VBAT | Backup battery input | Connects to coin cell or supercap; supplies VOUT when VCC fails - supports voltages exceeding VCC |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset assertion down to VCC = 1.0 V | Ensures deterministic MCU reset even during deep brownout, critical for data integrity in power-sensitive systems |
| Automatic battery switchover with 100 Ω on-resistance | Enables seamless LPSRAM backup with <10 mV drop at 75 mA, eliminating need for external diode-or circuitry |
| Low 0.4 µA battery current (typ) | Extends coin-cell life to >10 years in standby - suitable for unattended industrial logging devices |
| Integrated power-fail comparator (PFI/PFO) | Provides programmable early-warning signal before VCC collapse, allowing firmware-controlled save-and-shutdown sequences |
| 200 ms reset timeout with temperature stability | Meets JEDEC JESD22-A103 reliability requirements for reset pulse width across full industrial temperature range |
Applications
| Industrial PLC Controller | Smart Meter Data Logger |
|---|---|
|
Use Scenario: Maintains SRAM contents during grid voltage sags or battery-backed meter power loss. IC Role / Device Role / Timing Role: Supervisory IC providing VOUT switchover, PFO-triggered firmware save, and MR-initiated calibration reset. Use Value: Prevents EEPROM wear by enabling RAM-based logging with atomic power-loss recovery via 200 ms trec-aligned shutdown. |
Use Scenario: Preserves time-of-use energy registers during utility power interruption. IC Role / Device Role / Timing Role: Battery switchover controller and power-fail detector interfacing with metrology SoC reset and interrupt pins. Use Value: Achieves Class 0.2 accuracy compliance by guaranteeing <100 ns PFO response to VCC dip, synchronized with RTC backup. |
| Medical Infusion Pump | Factory Automation HMI |
|
Use Scenario: Secures therapy parameter storage during AC/DC adapter failure or battery swap. IC Role / Device Role / Timing Role: Dual-role supervisor: RST enforces safe motor stop, VOUT sustains volatile configuration memory. Use Value: Meets IEC 62304 Class C software safety requirements via hardware-enforced reset timing and battery current ≤0.4 µA. |
Use Scenario: Enables hot-swap display module replacement without host CPU reboot. IC Role / Device Role / Timing Role: Isolates VOUT-powered display SRAM from main 3.3 V rail using Vccsw-gated external PMOS. Use Value: Reduces mean-time-to-repair by decoupling display power domain, with Vccsw status enabling graceful UI fade-out. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM805TM6F | Same SO8 package, identical pinout, but RST is active-low push-pull (not open-drain) | Requires no external pull-up; incompatible with MCUs needing active-high reset assertion | Select STM805 only if target MCU accepts active-low reset and board layout allows direct RST connection |
| TPS3808G125DBVR | TI part with adjustable reset threshold (1.25 V), 360 ms trec, and no battery switchover or PFI/PFO | Lacks VBAT support and power-fail warning - limited to basic reset supervision without SRAM backup | Choose TPS3808G125 only for cost-sensitive designs where battery backup and PFO are unnecessary |
Compared with STM805TM6F, STM804TM6E's open-drain RST offers flexible voltage-level translation but adds BOM cost for pull-up; versus TPS3808G125DBVR, it delivers integrated battery switchover and PFI/PFO at the expense of threshold adjustability - making it optimal for fixed-threshold, SRAM-critical industrial systems.
Availability
STM804TM6E is available at Aetrix Electronics and suitable for industrial PLC controllers, smart meter data loggers, medical infusion pumps, and factory automation HMIs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for STM804TM6E 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 automotive, industrial, and consumer markets.
The STM690/80x family was engineered specifically for robust microprocessor supervision in battery-backed embedded systems - emphasizing low quiescent current, precise voltage thresholds, and seamless SRAM non-volatilization without external components.
FAQ
Does STM804TM6E include a watchdog timer?
No. The STM804 does not incorporate a watchdog timer - this function is explicitly excluded per ST's device summary table and confirmed in Section 2.3 of the datasheet, which states "NOT available on STM704/795/806" and omits WDI pin functionality for STM804. Designers requiring watchdog capability must select STM690, STM802, or STM805 instead.
What is the maximum load current supported on VOUT?
VOUT supports up to 75 mA continuous current, as specified in the "I/O status in battery backup" table and validated by on-resistance curves (Figures 15–16). Exceeding this limit risks VOUT droop beyond 100 mV under worst-case temperature conditions; for higher loads, use Vccsw to drive an external PMOS transistor as described in Section 1.1.8.
Can VBAT exceed VCC in STM804TM6E?
Yes. VBAT may be higher than VCC - the internal P-channel MOSFET switch blocks reverse current flow, preventing VBAT from back-driving the main supply. This allows use of 3.6 V lithium primary cells with a 3.0 V VCC rail, as confirmed in Section 1.1.11 and Figure 4's connection diagram.
Is STM804TM6E compatible with MiniSO8 footprint?
No. STM804TM6E is specified only for the standard SO8 package (MS-012AC), as indicated by the "M6E" suffix in the part number and confirmed in Table 10 (Ordering Information) and Section 6.1. MiniSO8 variants carry "M6Y" or "M6R" suffixes and have different thermal and mechanical characteristics - they are not interchangeable without PCB redesign.
STM804TM6E 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:
- Open Drain or Open Collector
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
STM804TM6E FAQ
1.How can I place an order for STM804TM6E through Aetrix?
Please submit a Request for Quotation (RFQ) for STM804TM6E 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 STM804TM6E reliable?
The price and inventory of STM804TM6E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM804TM6E is usually 5 days.
3.What payment methods are accepted for STM804TM6E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM804TM6E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM804TM6E?
STM804TM6E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM804TM6E 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 STM804TM6E?
For technical support, including STM804TM6E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM804TM6E requirements.
6.How does Aetrix verify that STM804TM6E is sourced from the original manufacturer or authorized distributors?
All STM804TM6E 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 STM804TM6E meets industry standards.
7.What is the process for return or replacement of STM804TM6E?
All STM804TM6E units undergo pre-shipment inspection (PSI). If there is an issue with STM804TM6E, 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 STM804TM6E part is unused and in its original packaging.
Return procedure for STM804TM6E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM804TM6E Tags
-
MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
Diodes Incorporated
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APX803L20-29SA-7
Diodes Incorporated
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V6340RSP3B+
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EM6325CXSP5B-2.9+
EM Microelectronic
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MCP120T-300I/TT
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MCP130T-315I/TT
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MCP120T-475I/TT
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