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Diodes Incorporated PT7M7811RTBE
- Part No.:
- PT7M7811RTBE
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
PT7M7811RTBE.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,410
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Product details
Overview
PT7M7811RTBE from Diodes Incorporated is a precision microprocessor supervisory IC with 4.00V reset threshold, 200ms reset pulse width, debounced manual-reset input, and watchdog timer functionality. It asserts active-low push-pull RESET during power-up, brownout, or watchdog timeout, and guarantees valid reset output down to VCC = 1.0V. Used in embedded systems requiring reliable power monitoring and system recovery.
For engineers reviewing the PT7M7811RTBE datasheet, PT7M7811RTBE pinout, PT7M7811RTBE application, or PT7M7811RTBE equivalent, key selection criteria include reset threshold accuracy (±2.5% over –40°C to +85°C), integrated watchdog timeout (1.6s typ.), internal MR pull-up (10–40kΩ), and SOT143-4 package compatibility with space-constrained μP power rails.
Technical Context
The PT7M7811RTBE implements a dual-function supervisory architecture: a precision voltage monitor with hysteresis (VRTH = 50mV) and a watchdog timer triggered by WDI edge transitions. Its reset generator ensures monotonic assertion during VCC ramp-up and maintains low state for ≥200ms after VCC exceeds VRST.
It features a CMOS-compatible manual-reset input (MR) with internal pull-up and supports active-low push-pull RESET output. The device operates across 1.0V to 5.5V supply range and guarantees functional reset behavior at VCC as low as 1.0V - critical for low-voltage microcontroller initialization sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.00V ±2.5% (–40°C to +85°C); ensures reliable reset assertion before μP supply drops below operational minimum. |
| Reset Pulse Width | 200ms typ.; provides sufficient time for μP core and peripherals to fully initialize after power stabilization. |
| Watchdog Timeout | 1.6s typ.; detects software lockup in real-time embedded applications without requiring external timing components. |
| Supply Voltage Range | 1.0V to 5.5V; enables use with 1.2V, 1.8V, 3.3V, and 5V logic families and supports brownout detection down to ultra-low VCC. |
| MR Pull-up Resistor | 10–40kΩ internal; eliminates need for external pull-up, simplifying BOM and PCB layout for manual reset button interface. |
| RESET Output Type | Active-low push-pull; drives standard CMOS inputs directly without external pull-up, reducing standby current vs open-drain. |
| Quiescent Current | 10–30µA at 5V; minimizes impact on battery-powered or energy-sensitive systems during sleep or idle states. |
Pinout & Package
SOT143-4 package: 4-pin surface-mount plastic package with 1.3mm × 2.1mm footprint, 0.95mm height, and 0.65mm lead pitch - optimized for compact μP power monitoring near processor VCC pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Primary supply rail connection; reset assertion triggered when voltage falls below 4.00V threshold. |
| GND | Ground reference | Common return path for all internal circuitry and reset output sink current. |
| MR | Manual-reset input | CMOS-compatible active-low input; internal 10–40kΩ pull-up allows direct push-button connection to GND. |
| RESET | Active-low reset output | Push-pull driver capable of sinking ≥1.2mA at 2.7V; asserts low during power-up, brownout, or MR activation. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.00V reset threshold | ±2.5% tolerance over full temperature range ensures consistent reset point across industrial environments. |
| Integrated watchdog timer | 1.6s timeout with WDI edge-triggered clear enables autonomous software health monitoring without MCU intervention. |
| Debounced manual-reset input | Internal filtering prevents false resets from mechanical switch bounce; supports clean, single-pulse reset initiation. |
| Guaranteed RESET validity at 1.0V VCC | Ensures deterministic reset assertion even during deep brownout, preventing undefined μP startup states. |
| Low quiescent current (10–30µA) | Reduces system-level standby power consumption - critical for battery-backed or always-on embedded controllers. |
Applications
| Industrial PLC Controller | Network Router Power Management |
|---|---|
|
Use Scenario: Power sequencing and fault recovery in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Monitors 3.3V I/O rail and asserts RESET if voltage sags below 4.00V due to load transients or aging PSU. Use Value: Prevents corrupted ladder logic execution during brownout by holding μP in reset until stable 3.3V is restored for ≥200ms. |
Use Scenario: Ensuring reliable boot and runtime supervision in multi-rail network infrastructure equipment. IC Role / Device Role / Timing Role: Supervises 5V auxiliary rail feeding management MCU; WDI fed by periodic firmware heartbeat signal. Use Value: Triggers automatic reboot within 1.6s if firmware hangs, eliminating need for remote technician intervention. |
| Smart Surveillance Camera | Medical Diagnostic Handheld |
|
Use Scenario: Maintaining system integrity in battery-powered IP cameras subject to thermal cycling and voltage droop. IC Role / Device Role / Timing Role: Monitors 3.3V camera SoC supply; MR tied to hardware reset button for field service recovery. Use Value: Internal MR pull-up eliminates discrete resistor, saving board area while enabling one-button forced reset without external components. |
Use Scenario: Safe power-up and fail-safe operation in portable diagnostic devices with strict regulatory uptime requirements. IC Role / Device Role / Timing Role: Guarantees RESET remains asserted until VCC reaches 4.00V and holds for 200ms - meeting IEC 62304 power-on timing compliance. Use Value: Valid RESET output at VCC = 1.0V ensures deterministic reset even during rapid battery discharge below nominal voltage. |
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 | 4.00V threshold, 140–400ms reset pulse, no watchdog, SOT23-3 package | Lacks WDI and MR; suitable only for basic reset-only applications | Select when watchdog and manual reset are unnecessary and board space requires 3-pin footprint. |
| TPS3808G33DBVR | 3.3V threshold, adjustable delay, 1.5µA IQ, no MR, SOT23-6 package | Fixed 3.3V threshold incompatible with 4.00V rail monitoring; higher pin count | Choose only if system uses 3.3V supply and ultra-low IQ (<2µA) is prioritized over watchdog/MR features. |
Compared with MAX809SEUR+T and TPS3808G33DBVR, PT7M7811RTBE uniquely combines 4.00V precision threshold, integrated watchdog, debounced MR, and SOT143-4 compactness - making it optimal for μP systems requiring full supervision in minimal area.
Availability
PT7M7811RTBE is available at Aetrix Electronics and suitable for industrial PLC controllers, network router power management, smart surveillance cameras, and medical diagnostic handhelds requiring stable component supply and long-term lifecycle support.
Supply support for PT7M7811RTBE 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 and signal integrity solutions for industrial, computing, and communications markets.
The PT7M78xx family targets μP system reliability - delivering integrated voltage monitoring, watchdog, and manual reset in ultra-small packages to replace discrete supervision circuits in space- and cost-constrained designs.
FAQ
What is the guaranteed minimum VCC level at which PT7M7811RTBE asserts RESET?
The PT7M7811RTBE guarantees valid RESET assertion down to VCC = 1.0V, ensuring deterministic reset behavior during deep brownout conditions. This is confirmed in the datasheet's "Guaranteed RESET/RESET valid at VCC=1.0V" description and DC Electrical Characteristics table under ICC test conditions.
Does PT7M7811RTBE require an external pull-up resistor on the MR pin?
No - PT7M7811RTBE includes an internal MR pull-up resistor of 10–40kΩ, allowing direct connection of a momentary switch between MR and GND without external components. This is specified in the DC Electrical Characteristics table under "r MR pull-up resistor" for PT7M7811/7812.
Can the watchdog timer be disabled without modifying the PCB layout?
Yes - the watchdog function is automatically disabled when the WDI pin is left unconnected or driven by a high-impedance (three-state) buffer. The datasheet states: "Floating WDI or connecting WDI to a high-impedance three-state buffer disables the watchdog feature." No solder jumpers or trace cuts are required.
What is the actual reset timeout hysteresis value for PT7M7811RTBE?
The reset threshold hysteresis (VRTH) for PT7M7811RTBE is 50mV, as listed in the DC Electrical Characteristics table under "VRTH Reset Threshold Hysteresis" for "Others" - which includes the PT7M7811 series. This ensures clean release without chatter during VCC recovery near 4.00V.
PT7M7811RTBE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- 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-143-4
PT7M7811RTBE FAQ
1.How can I place an order for PT7M7811RTBE through Aetrix?
Please submit a Request for Quotation (RFQ) for PT7M7811RTBE 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 PT7M7811RTBE reliable?
The price and inventory of PT7M7811RTBE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT7M7811RTBE is usually 5 days.
3.What payment methods are accepted for PT7M7811RTBE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT7M7811RTBE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PT7M7811RTBE?
PT7M7811RTBE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PT7M7811RTBE 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 PT7M7811RTBE?
For technical support, including PT7M7811RTBE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT7M7811RTBE requirements.
6.How does Aetrix verify that PT7M7811RTBE is sourced from the original manufacturer or authorized distributors?
All PT7M7811RTBE 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 PT7M7811RTBE meets industry standards.
7.What is the process for return or replacement of PT7M7811RTBE?
All PT7M7811RTBE units undergo pre-shipment inspection (PSI). If there is an issue with PT7M7811RTBE, 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 PT7M7811RTBE part is unused and in its original packaging.
Return procedure for PT7M7811RTBE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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