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Diodes Incorporated PT7M7811STAEX
- Part No.:
- PT7M7811STAEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
PT7M7811STAEX.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,984
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Product details
Overview
PT7M7811STAEX from Diodes Incorporated is a precision microprocessor (μP) supervisory IC with 2.93V reset threshold, push-pull active-low RESET output, debounced manual-reset input (MR), and watchdog timer input (WDI). It asserts reset during power-up, brownout, or watchdog timeout, guarantees RESET validity down to VCC = 1.0V, and operates across –40°C to +85°C for embedded system power monitoring.
For engineers reviewing the PT7M7811STAEX datasheet, PT7M7811STAEX pinout, PT7M7811STAEX application, or PT7M7811STAEX equivalent, key selection criteria include its 2.93V threshold accuracy (±2.5% over temperature), 200ms reset pulse width, internal MR pull-up resistor (10–40kΩ), watchdog timeout of 1.6s, and SOT23-5 package compatibility with space-constrained μP systems.
Technical Context
The PT7M7811STAEX integrates a precision voltage monitor, reset generator with 200ms timeout, and a watchdog timer that triggers reset if WDI remains static beyond 1.6s. Its reset assertion is guaranteed at VCC ≥ 1.0V, and release occurs only after VCC exceeds 2.93V and sustains for the full timeout period.
It features a CMOS-compatible debounced MR input with internal pull-up (10–40kΩ), enabling push-button reset without external components, and a push-pull RESET output capable of sinking 3.2mA at VCC ≥ 4.5V while maintaining VOL ≤ 0.4V - suitable for direct interface with μP reset inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±2.5% over –40°C to +85°C - ensures reliable brownout detection for 3.3V systems |
| Reset Pulse Width | 200ms typ. - provides sufficient hold time for μP initialization and memory stabilization |
| Watchdog Timeout | 1.6s typ. - balances fault detection responsiveness with software execution margin |
| Supply Voltage Range | 1.0V to 5.5V - supports operation during deep brownout and enables use in low-voltage subsystems |
| MR Input Pull-up | 10–40kΩ internal - eliminates need for external resistor in manual-reset circuits |
| RESET Output Type | Push-pull active-low - drives μP reset pin directly without pull-up resistor or level-shifting |
| Quiescent Current | 10–30µA at 5V - minimizes standby power impact in battery-backed or energy-sensitive designs |
Pinout & Package
PT7M7811STAEX is packaged in a 5-pin SOT23-5 (TA) surface-mount package with 0.95mm pitch, optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Supplies device core; reset asserted when voltage drops below 2.93V; valid operation guaranteed down to 1.0V |
| GND | Ground reference | Common return path for all internal circuitry and I/O signals |
| RESET | Active-low push-pull reset output | Drives μP reset pin low during power-up/brownout/watchdog timeout; sinks up to 3.2mA |
| MR | Debounced manual-reset input | CMOS-compatible active-low input with internal 10–40kΩ pull-up; no external resistor required |
| WDI | Watchdog timer input | Edge-sensitive CMOS input; toggling within 1.6s prevents reset; floating disables watchdog |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.93V threshold | ±2.5% tolerance over full temperature range ensures consistent brownout response in 3.3V rail monitoring |
| 200ms guaranteed reset pulse | Meets μP minimum reset assertion time requirements without external timing components |
| Integrated MR pull-up | 10–40kΩ internal resistor eliminates BOM cost and layout area for manual-reset circuitry |
| Watchdog with 1.6s timeout | Provides fail-safe recovery for firmware hangs without requiring external timing elements |
| 1.0V VCC operation guarantee | Ensures deterministic reset behavior even during severe undervoltage conditions prior to complete power loss |
Applications
| Industrial PLC Controller | Network Router Power Management |
|---|---|
Use Scenario: Monitoring 3.3V main supply in programmable logic controller with real-time OS and fieldbus interfaces. IC Role / Device Role / Timing Role: μP supervisor providing power-on reset, brownout protection, and watchdog supervision for ARM Cortex-M7 core. Use Value: Prevents corrupted I/O state during voltage sag on 3.3V rail; 2.93V threshold aligns precisely with 3.3V ±5% spec; 200ms pulse ensures full register initialization. | Use Scenario: Ensuring reliable boot sequence and runtime stability in multi-core network router with PoE-powered subsystems. IC Role / Device Role / Timing Role: Dual-role supervisor: reset generator during 3.3V rail ramp-up and watchdog enforcer for packet-processing firmware threads. Use Value: Push-pull RESET drives multiple SoC reset pins simultaneously; WDI tied to GPIO toggle prevents silent lockup without adding MCU overhead. |
| Embedded Security Camera | Server BMC Power Sequencing |
Use Scenario: Maintaining operational integrity in battery-buffered IP camera with motion-triggered recording and edge AI inference. IC Role / Device Role / Timing Role: Supervisor for low-power ARM-based SoC, coordinating reset with battery voltage monitoring and thermal shutdown signals. Use Value: MR input enables hardware-initiated reboot via front-panel button; 1.0V VCC operation ensures last-resort reset before brownout-induced flash corruption. | Use Scenario: Managing power-good sequencing and fault recovery in server Baseboard Management Controller (BMC) with dual-rail (1.8V/3.3V) supply. IC Role / Device Role / Timing Role: Dedicated supervisor for BMC's 3.3V domain, asserting reset if main rail collapses or watchdog detects firmware hang. Use Value: Internal MR pull-up simplifies board design; 2.93V threshold avoids false resets during nominal 3.3V ripple; SOT23-5 footprint fits tight BMC layout constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar μP supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| APX811S293TSG-7 | Same 2.93V threshold, but open-drain RESET output and no WDI input | Lacks watchdog capability; requires external pull-up for RESET; suited for simpler reset-only systems | Select when watchdog functionality is unnecessary and board already includes pull-up resistors |
| TPS3808G33DBVR | 2.93V threshold, push-pull RESET, but fixed 200ms delay and no MR input | Does not support manual reset; designed for fixed-timing applications without user-initiated reboot | Choose when MR functionality is omitted and TI ecosystem compatibility is prioritized |
Compared with APX811S293TSG-7 and TPS3808G33DBVR, PT7M7811STAEX uniquely combines 2.93V precision monitoring, push-pull RESET, debounced MR, and WDI in one SOT23-5 package - enabling full-featured supervision without external components or timing compromises.
Availability
PT7M7811STAEX is available at Aetrix Electronics and suitable for industrial PLC controllers, network routers, embedded security cameras, and server BMCs requiring stable component supply and long-term manufacturability.
Supply support for PT7M7811STAEX 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and communications markets.
The PT7M78xx family is designed specifically for μP system reliability - integrating precision voltage monitoring, reset generation, manual reset, and watchdog functions into compact, RoHS-compliant packages for embedded power-supply supervision.
FAQ
What is the function of the WDI pin on PT7M7811STAEX?
The WDI (Watchdog Input) pin is a CMOS-compatible input that monitors microprocessor activity. If WDI remains static (high or low) for longer than the 1.6s watchdog timeout, the device asserts RESET. A rising or falling edge clears the timer. Leaving WDI unconnected disables the watchdog function entirely.
Can PT7M7811STAEX operate reliably below 2.93V?
Yes - PT7M7811STAEX guarantees RESET output validity down to VCC = 1.0V. While the reset threshold is 2.93V (falling edge), the device continues asserting RESET until VCC drops below 1.0V, ensuring deterministic behavior during deep brownout and graceful shutdown.
Is an external pull-up resistor required on the MR pin?
No. PT7M7811STAEX includes an internal MR pull-up resistor of 10–40kΩ. The MR pin can be left unconnected when unused, or pulled low via a momentary switch to initiate a manual reset - no external components are needed for basic operation.
How does the reset pulse width behave during repeated brownout events?
If a brownout occurs mid-reset pulse, the device extends the RESET assertion for at least another 200ms after VCC recovers above 2.93V. This ensures the microprocessor receives a clean, uninterrupted reset signal regardless of transient supply instability during recovery.
PT7M7811STAEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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:
- SOT-23-5
PT7M7811STAEX FAQ
1.How can I place an order for PT7M7811STAEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PT7M7811STAEX 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 PT7M7811STAEX reliable?
The price and inventory of PT7M7811STAEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT7M7811STAEX is usually 5 days.
3.What payment methods are accepted for PT7M7811STAEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT7M7811STAEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PT7M7811STAEX?
PT7M7811STAEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PT7M7811STAEX 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 PT7M7811STAEX?
For technical support, including PT7M7811STAEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT7M7811STAEX requirements.
6.How does Aetrix verify that PT7M7811STAEX is sourced from the original manufacturer or authorized distributors?
All PT7M7811STAEX 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 PT7M7811STAEX meets industry standards.
7.What is the process for return or replacement of PT7M7811STAEX?
All PT7M7811STAEX units undergo pre-shipment inspection (PSI). If there is an issue with PT7M7811STAEX, 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 PT7M7811STAEX part is unused and in its original packaging.
Return procedure for PT7M7811STAEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PT7M7811STAEX Tags
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MIC826SYMT-TR
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