My Inquiry
My Account
STMicroelectronics STM813LDS6F
- Part No.:
- STM813LDS6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
STM813LDS6F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,043
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
STM813LDS6F from STMicroelectronics is a 5 V precision voltage supervisor IC with active-high reset output, watchdog timer, manual reset input, and power-fail comparator - designed for reliable microprocessor reset management in industrial systems. It asserts RST when VCC drops below 4.50–4.75 V, provides 200 ms reset timeout (trec), delivers 1.6 s watchdog timeout, draws only 40 µA typical supply current, and operates from –40 °C to +85 °C.
For engineers reviewing the STM813LDS6F datasheet, STM813LDS6F pinout, STM813LDS6F application, or STM813LDS6F equivalent, key selection criteria include its guaranteed RST assertion down to VCC = 1.0 V, push-pull RST/RST outputs, PFI/PFO undervoltage warning capability, and compatibility with 5 V microcontroller reset interfaces requiring precise threshold stability and noise-immune manual reset.
Technical Context
The STM813L integrates a precision bandgap reference, dual independent comparators (VCC monitor and PFI threshold), a 1.6 s watchdog timer with edge-sensitive WDI, and trec-based reset timing logic. Its RST output remains valid down to VCC = 1.0 V, and the internal pull-up on MR eliminates external biasing.
Unlike STM707/708, the STM813L includes both RST (active-low) and RST (active-high) outputs plus WDO - enabling flexible reset signaling and watchdog-triggered reset via MR tieback. The PFI comparator uses a dedicated 1.25 V reference (VPFI), independent of VRST, allowing early power-fail detection before VCC collapse.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Monitor Threshold | 4.50 V to 4.75 V - ensures reset assertion before 5 V MCU enters undefined operation |
| Reset Timeout (trec) | 200 ms (typ) - guarantees sufficient hold time for full microprocessor initialization |
| Watchdog Timeout | 1.6 s (typ) - detects firmware lockup without requiring CPU clock or software intervention |
| Supply Current | 40 µA (typ) - enables low-power system monitoring without significant battery drain |
| Operating Temperature | –40 °C to +85 °C - supports industrial-grade reliability across extended thermal environments |
| Power-Fail Threshold (VPFI) | 1.25 V - allows configurable undervoltage warning via external resistor divider on PFI |
| RST Assertion Limit | Valid down to VCC = 1.0 V - maintains deterministic reset state during brownout recovery |
Pinout & Package
STM813LDS6F is housed in an 8-pin TSSOP package (3 mm × 3 mm body, DS suffix), optimized for space-constrained PCB layouts while maintaining standard SOIC footprint compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PFO | Power-fail output | Push-pull active-low signal indicating PFI < VPFI; used for early power-loss alert or MR-triggered reset |
| 2 - RST | Active-high reset output | Asserts high during VCC fault or MR low; remains high for trec after recovery - directly drives MCU reset pins requiring active-high assertion |
| 3 - VSS | Ground | Reference return path for all internal comparators and outputs; must be low-impedance connection |
| 4 - VCC | Supply input | 5 V nominal input powering all internal circuitry; monitored for out-of-tolerance condition |
| 5 - PFI | Power-fail input | Analog input compared to 1.25 V reference; connected to voltage divider for pre-failure detection |
| 6 - MR | Manual reset input | Active-low input with internal 40 kΩ pull-up; debounced by trec - enables hardware reset without external RC |
| 7 - WDI | Watchdog input | Edge-sensitive input; toggling within 1.6 s prevents watchdog timeout; floating disables function |
| 8 - WDO | Watchdog output | Push-pull active-low output asserted on timeout or VCC drop; can be tied to MR for automatic watchdog-reset loop |
Key Features
| Feature | Design Value |
|---|---|
| Dual reset outputs | RST (active-high) and RST (active-low) provide interface flexibility for diverse MCU reset pin polarities |
| Guaranteed reset at low VCC | RST remains valid down to VCC = 1.0 V - ensures deterministic behavior during brownout recovery |
| Integrated watchdog timer | 1.6 s timeout with edge-triggered WDI - detects firmware hangs without CPU clock dependency |
| Independent power-fail detection | Dedicated 1.25 V VPFI comparator - enables early warning before VCC falls below MCU minimum operating voltage |
| No external components required | Internal MR pull-up and push-pull outputs eliminate need for external resistors or buffers in basic configurations |
Applications
| Industrial PLC Controller | Smart Energy Meter |
|---|---|
Use Scenario: Continuous operation in factory automation cabinets with fluctuating 5 V rail due to shared switching supplies. IC Role / Device Role / Timing Role: Primary reset supervisor ensuring MCU reboot on brownout, with PFI monitoring unregulated DC bus to preemptively warn of AC mains failure. Use Value: 200 ms trec guarantees full bootloader execution; 4.625 V typical VRST threshold aligns with 5 V ±5% industrial spec. | Use Scenario: Battery-backed metering unit requiring fail-safe reset during backup switchover and long-term low-power monitoring. IC Role / Device Role / Timing Role: Dual-role supervisor: RST manages main MCU reset; PFO triggers backup RAM save routine before VCC collapse. Use Value: 40 µA quiescent current extends battery life; 1.25 V VPFI enables accurate detection of 3.3 V regulator sag prior to 5 V rail collapse. |
| Medical Diagnostic Equipment | Automotive Body Control Module (BCM) |
Use Scenario: Safety-critical imaging subsystem where unexpected MCU freeze must trigger immediate hardware reset without software involvement. IC Role / Device Role / Timing Role: Watchdog-enforced supervision: WDI fed by timer interrupt, WDO tied to MR - forces hard reset on missed interrupt. Use Value: 1.6 s watchdog period balances responsiveness and false-trigger immunity; RST assertion down to 1.0 V prevents metastability during partial power loss. | Use Scenario: 12 V automotive system with 5 V LDO supplying infotainment MCU; subject to load dump and cold-crank transients. IC Role / Device Role / Timing Role: VCC supervisor with MR tied to ignition switch - asserts RST on key-on power ramp and holds until stable 5 V achieved. Use Value: 200 ms trec accommodates slow LDO startup; 4.50–4.75 V VRST range avoids nuisance resets during cold-crank dip to ~4.3 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX813L | Identical pinout, same 4.50–4.75 V reset threshold and 200 ms trec, but higher 60 µA supply current | Lacks integrated watchdog timer - requires external circuitry for WDI/WDO functionality | Select MAX813L only if legacy design reuse or second-source qualification mandates Maxim compatibility |
| TPS3808G18 | Adjustable reset threshold (via external resistor), 360 ms trec, 1.8 V to 5.5 V supply range, no PFI/PFO | Supports multi-rail systems but omits power-fail warning and dual reset polarity | Choose TPS3808G18 when programmable threshold or wider VCC range is prioritized over PFI-based predictive shutdown |
Compared with MAX813L and TPS3808G18, STM813LDS6F uniquely combines fixed precision 5 V supervision, dual-polarity reset outputs, integrated watchdog, and independent power-fail detection - making it optimal for cost-sensitive industrial designs requiring comprehensive, self-contained reset management without external components.
Availability
STM813LDS6F is available at Aetrix Electronics and suitable for industrial control systems, smart metering platforms, medical diagnostics equipment, and automotive body electronics requiring stable component supply and long-term lifecycle support.
Supply support for STM813LDS6F 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, delivering silicon solutions for automotive, industrial, and consumer markets since 1987.
The STM70x/813L series was developed specifically for robust, low-component-count microprocessor supervision in harsh industrial environments - emphasizing precision threshold stability, wide temperature operation, and integrated fault-detection features.
FAQ
What is the function of the PFI and PFO pins on STM813LDS6F?
PFI is an analog input compared to a dedicated 1.25 V internal reference (VPFI); when PFI voltage falls below VPFI, PFO - a push-pull active-low output - asserts. This enables early warning of power supply degradation before VCC drops below the reset threshold, supporting predictive shutdown or data save routines.
Can STM813LDS6F be used with 3.3 V microcontrollers?
No - STM813LDS6F is specified only for 5 V operation (VCC = 4.5–5.5 V). Its reset threshold (4.50–4.75 V) and internal reference architecture are optimized for 5 V systems. For 3.3 V supervision, ST offers the STM809/STM810 family with corresponding 3.08 V thresholds.
How does the watchdog timer interact with the reset outputs?
The watchdog timer asserts WDO low on timeout, but does not directly drive RST or RST. To trigger a system reset, WDO must be externally connected to MR. When asserted, MR then causes both RST and RST to activate per normal reset logic - enabling fully hardware-managed watchdog recovery.
Is the MR pin internally pulled up, and what is its impedance?
Yes - MR has an internal pull-up resistor of approximately 40 kΩ to VCC, allowing direct switch-to-ground connection without external biasing. This value ensures reliable logic-low assertion with ≤100 Ω contact resistance while limiting current draw during manual reset activation.
STM813LDS6F 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
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
STM813LDS6F FAQ
1.How can I place an order for STM813LDS6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM813LDS6F 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 STM813LDS6F reliable?
The price and inventory of STM813LDS6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM813LDS6F is usually 5 days.
3.What payment methods are accepted for STM813LDS6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM813LDS6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM813LDS6F?
STM813LDS6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM813LDS6F 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 STM813LDS6F?
For technical support, including STM813LDS6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM813LDS6F requirements.
6.How does Aetrix verify that STM813LDS6F is sourced from the original manufacturer or authorized distributors?
All STM813LDS6F 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 STM813LDS6F meets industry standards.
7.What is the process for return or replacement of STM813LDS6F?
All STM813LDS6F units undergo pre-shipment inspection (PSI). If there is an issue with STM813LDS6F, 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 STM813LDS6F part is unused and in its original packaging.
Return procedure for STM813LDS6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM813LDS6F 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…
