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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

STMicroelectronics STM802LM6E

Name: STM802LM6E
Brand: STMicroelectronics
SKU: STM802LM6E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STM802LM6E

Manufacturer:: STMicroelectronics

Category:: Supervisors

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: STM802LM6E.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8SO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STM802LM6E from STMicroelectronics is a 5 V microprocessor supervisory IC with battery switchover, NVRAM supervision for external LPSRAM, dual active-low and active-high reset outputs (RST/RST), and integrated watchdog timer (1.6 s typical timeout). It guarantees RST assertion down to VCC = 1.0 V and supports industrial temperature range (–40 °C to +85 °C). Used in embedded systems requiring reliable power monitoring and non-volatile SRAM backup during main supply failure.

For engineers reviewing the STM802LM6E datasheet, STM802LM6E pinout, STM802LM6E application, or STM802LM6E equivalent, key selection criteria include guaranteed reset assertion at low VCC, automatic VCC-to-VBAT switchover on power loss, push-pull RST/RST outputs, watchdog timer supervision, and compatibility with external low-power SRAM retention circuits.

Technical Context

The STM802LM6E integrates a precision voltage reference and comparator to monitor VCC against a fixed reset threshold (VRST ≈ 4.63 V), asserting RST/RST when VCC drops below VRST or after manual reset (MR) or watchdog timeout. Its internal P-channel MOSFET switch enables seamless switchover from VCC to VBAT (≥1 V) on power failure, maintaining VOUT for external LPSRAM.

It features dual push-pull reset outputs with 200 ms typical reset timeout (trec), a 1.6 s watchdog timer cleared by WDI edge transitions, and a power-fail comparator (PFI/PFO) with 2.4 V threshold. All RST and RST outputs remain valid during battery backup mode, and MR includes internal 40 kΩ pull-up.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply voltage	5 V nominal; operates across full industrial VCC range with guaranteed RST assertion down to 1.0 V.
Reset threshold (VRST)	4.63 V (typ); precise comparator ensures deterministic reset initiation during brownout conditions.
Reset timeout (trec)	200 ms (typ); internal timer holds RST/RST asserted post-power-up or post-event for stable MCU initialization.
Watchdog timeout (tWD)	1.6 s (typ); detects MCU lockup via WDI edge detection; disabled if WDI floats.
Battery switchover	Automatic VCC-to-VBAT transition at VSO (lesser of VBAT and VRST); enables zero-interruption SRAM backup.
Supply current (I_CC)	40 µA (typ) at VCC = 5 V; ultra-low quiescent current preserves system power budget.
Battery current (I_VBAT)	0.4 µA (typ); minimal drain extends backup battery life during extended storage or outage.

Pinout & Package

STM802LM6E is housed in an 8-pin SO8 (Small Outline) package per JEDEC MS-012, with 1.27 mm pitch and surface-mount footprint. Pin functions are validated per STMicroelectronics DocID10522 Rev 11.

Pin/Terminal	Circuit Role	Design Meaning
1: RST	Active-high reset output	Push-pull output asserted high during reset condition; compatible with MCUs requiring active-high reset input.
2: VOUT	SRAM supply output	Switched output connected to VCC or VBAT; powers external LPSRAM during main supply failure.
3: PFO	Power-fail output	Push-pull signal goes low when PFI < VPFI (≈2.4 V) or VCC falls below switchover threshold.
4: VSS	Ground reference	Common return path for all internal circuitry and external LPSRAM ground connection.
5: PFI	Power-fail input	Monitors auxiliary supply or rail; triggers PFO assertion when voltage drops below 2.4 V threshold.
6: MR	Manual reset input	Active-low input with internal 40 kΩ pull-up; asserts reset when pulled low; debounced internally.
7: WDI	Watchdog input	Edge-sensitive input; clears watchdog timer on rising/falling edges; float disables watchdog.
8: VCC	Main supply input	Primary 5 V power source; monitored for reset generation and used to drive VOUT when above VSO.

Key Features

Feature	Design Value
Dual reset outputs	RST (active-low) and RST (active-high) provide direct interface flexibility with diverse MCU reset architectures.
Automatic battery switchover	VCC-to-VBAT transition at VSO ensures uninterrupted VOUT supply to LPSRAM without software or external logic.
Low-power operation	40 µA typical I_CC and 0.4 µA I_VBAT minimize impact on system energy budget during normal and backup modes.
Watchdog supervision	1.6 s timeout with edge-triggered clear enables robust MCU health monitoring without dedicated timer peripherals.
Power-fail warning	PFI/PFO pair delivers early system-level alert before VCC collapse, enabling graceful data save or state preservation.

Applications

Industrial PLC Controller

Medical Data Logger

Use Scenario: Maintains real-time process control during brief AC line dips or UPS switchover.

IC Role / Device Role / Timing Role: Supervises 5 V MCU supply and asserts RST/RST within 10 µs of VCC drop below 4.63 V; enables VOUT switchover to coin-cell battery.

Use Value: Prevents spurious MCU resets and preserves SRAM-stored configuration and runtime variables for deterministic recovery.

Use Scenario: Captures critical patient vitals during unexpected power loss in portable diagnostic equipment.

IC Role / Device Role / Timing Role: Monitors main supply and triggers PFO alert 50 ms before VCC collapse; initiates emergency save sequence via RST edge.

Use Value: Guarantees ≥200 ms of clean reset hold time and sustained VOUT for SRAM write completion before battery depletion.

Smart Energy Meter

Automotive Telematics Unit

Use Scenario: Retains tamper-proof metering registers and calibration data during grid outages lasting minutes.

IC Role / Device Role / Timing Role: Uses VBAT-supplied VOUT to power external LPSRAM; asserts RST to halt metering engine while preserving memory state.

Use Value: Eliminates need for EEPROM writes during power loss, reducing wear and latency; supports >10-year battery-backed retention.

Use Scenario: Preserves GPS session context and CAN message buffers during vehicle ignition cycling or battery disconnect.

IC Role / Device Role / Timing Role: Provides watchdog supervision of application MCU and generates synchronized RST/RST pulses during cold start.

Use Value: Ensures deterministic boot sequence and prevents CAN bus arbitration errors caused by partial MCU initialization.

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX809SEUR+T	Single active-low reset only; no RST, no watchdog, no battery switchover; 4.63 V threshold; SOT-23-3 package.	Limited to basic reset generation; cannot support LPSRAM backup or watchdog supervision.	Select only when cost and footprint are primary constraints and battery backup/watchdog are unnecessary.
TPS3808G18DBVR	Adjustable reset threshold (via external resistor divider); no VOUT/VBAT switchover; no PFI/PFO; 1.8 V to 5.5 V supply range.	Requires external components for threshold setting; lacks integrated SRAM power management capability.	Choose when programmable reset voltage is required and external LPSRAM supervision is handled separately.

Compared with MAX809SEUR+T and TPS3808G18DBVR, STM802LM6E uniquely integrates dual-reset outputs, automatic battery switchover, watchdog timer, and power-fail comparator in one SO8 package-enabling compact, self-contained NVRAM supervision without external logic or discrete FETs.

Availability

STM802LM6E is available at Aetrix Electronics and suitable for industrial PLC controllers, medical data loggers, smart energy meters, and automotive telematics units requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for STM802LM6E 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, mixed-signal, power, and microcontroller solutions for industrial, automotive, and consumer markets.

The STM802 series belongs to ST's supervisor IC product line, engineered specifically for robust power monitoring and non-volatile memory retention in resource-constrained embedded systems operating across harsh industrial environments.

FAQ

What is the function of the VOUT pin on STM802LM6E?

VOUT is the switched output that connects to external low-power SRAM (LPSRAM). When VCC is above the switchover voltage (VSO), VOUT is driven by VCC; when VCC falls below VSO, VOUT automatically switches to VBAT, ensuring continuous power to preserve SRAM contents during main supply failure.

Does STM802LM6E require external components to operate as a reset supervisor?

No external components are required for basic reset supervision. The device includes internal pull-up on MR, precision voltage reference, and push-pull RST/RST outputs. External capacitors (e.g., 0.1 µF on PFI or MR) are optional for noise immunity but not mandatory for functional operation.

Can the watchdog timer be disabled, and how?

Yes-the watchdog timer is disabled when the WDI pin is left floating or tri-stated. In this state, leakage current must remain below 10 µA and load capacitance under 200 pF. Driving WDI continuously high or low will cause periodic reset assertion every ~1.8 s (tWD + trec).

What is the minimum VBAT voltage required for reliable switchover and reset assertion?

VBAT must be ≥1.0 V to guarantee valid RST assertion during backup mode. The device supports VBAT up to 5.5 V and allows VBAT > VCC. Switchover occurs at VSO-the lesser of VBAT and VRST (4.63 V)-ensuring maximum battery utilization before transition.

STM802LM6E 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:: 4.65V

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

STM802LM6E FAQ

1.How can I place an order for STM802LM6E through Aetrix?

Please submit a Request for Quotation (RFQ) for STM802LM6E 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 STM802LM6E reliable?

The price and inventory of STM802LM6E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM802LM6E is usually 5 days.

3.What payment methods are accepted for STM802LM6E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM802LM6E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STM802LM6E?

STM802LM6E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STM802LM6E 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 STM802LM6E?

For technical support, including STM802LM6E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM802LM6E requirements.

6.How does Aetrix verify that STM802LM6E is sourced from the original manufacturer or authorized distributors?

All STM802LM6E 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 STM802LM6E meets industry standards.

7.What is the process for return or replacement of STM802LM6E?

All STM802LM6E units undergo pre-shipment inspection (PSI). If there is an issue with STM802LM6E, 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 STM802LM6E part is unused and in its original packaging.

Return procedure for STM802LM6E:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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