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Diodes Incorporated PT7M7811RTBEX
- Part No.:
- PT7M7811RTBEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
PT7M7811RTBEX.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,638
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Product details
Overview
PT7M7811RTBEX from Diodes Incorporated is a precision microprocessor supervisory circuit 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, and watchdog timeout events, and guarantees RESET validity down to VCC = 1.0V. Used in embedded systems requiring reliable power monitoring and system recovery.
For engineers reviewing the PT7M7811RTBEX datasheet, PT7M7811RTBEX pinout, PT7M7811RTBEX application, or PT7M7811RTBEX equivalent, key selection criteria include reset threshold accuracy (±2.5% over –40°C to +85°C), 200ms reset pulse width, internal MR pull-up (10–40 kΩ), WDI edge-triggered watchdog timeout (1.12–2.25 s), and SOT143-4 package compatibility.
Technical Context
The PT7M7811RTBEX implements a voltage-monitoring architecture that compares VCC against a precision bandgap reference to trigger reset when falling below 2.93V (VRN), with 4 mV hysteresis (VRTH) for noise immunity. Its reset generator includes a 200ms monostable timer that holds RESET low after threshold crossing or MR release.
It integrates a CMOS-compatible watchdog timer that resets on WDI inactivity exceeding 1.6s (typical); WDI accepts ≥150ns pulses and clears on any edge or during reset assertion. The MR input features internal pull-up and debouncing, enabling direct push-button interface without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±2.5% (–40°C to +85°C); ensures reliable brownout detection for 3.3V systems |
| Reset Pulse Width | 200ms (140–400ms); provides sufficient time for µP initialization before release |
| Supply Voltage Range | 1.0V to 5.5V; enables operation during deep brownout and supports wide-input systems |
| Watchdog Timeout | 1.6s typical (1.12–2.25s); balances fault detection speed and false-trigger immunity |
| MR Pull-up Resistor | 10–40 kΩ internal; eliminates need for external pull-up in manual-reset circuits |
| RESET Output Type | Push-pull active-low; drives logic directly without external pull-up, supports 3.2mA sink |
| Quiescent Current | 10–30 µA at 5V; minimizes standby power in battery-backed applications |
Pinout & Package
SOT143-4 package: 4-pin surface-mount plastic package with 1.3mm × 2.1mm footprint, 0.95mm height, and 0.95mm lead pitch. RoHS-compliant, Pb-free, tape-and-reel delivery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Primary supply rail; reset asserted when voltage falls below 2.93V |
| GND | Ground reference | Common return path for all signals and internal circuitry |
| MR | Manual-reset input | CMOS-compatible active-low input; internally pulled up; debounced |
| RESET | Active-low reset output | Push-pull driver; guaranteed low ≤0.4V at 3.2mA sink; valid down to VCC = 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage monitoring | 2.93V threshold with ±2.5% tolerance over full temperature range ensures consistent brownout response in industrial environments |
| Integrated watchdog timer | Edge-triggered WDI input with 1.6s timeout detects µP lockup without external timing components |
| Debounced manual reset | Internal MR pull-up (10–40 kΩ) and hardware debounce eliminate switch bounce and reduce BOM count |
| Low-voltage reset guarantee | RESET remains valid and functional down to VCC = 1.0V, enabling robust operation during deep power sag |
| Push-pull RESET output | Direct-drive capability eliminates external pull-up resistor, simplifying PCB layout and reducing leakage paths |
Applications
| Industrial PLC Controller | Network Router Power Management |
|---|---|
|
Use Scenario: Continuous operation in factory-floor control cabinets with fluctuating 24V DC rails converted to 3.3V. IC Role / Device Role / Timing Role: Supervisory circuit monitoring 3.3V domain; triggers hard reset on undervoltage or software hang via WDI. Use Value: Prevents corrupted firmware execution during line sags by asserting 200ms reset pulse synchronized to VCC recovery. |
Use Scenario: Multi-rail power sequencing in enterprise-grade routers with 12V/5V/3.3V supplies. IC Role / Device Role / Timing Role: Monitors primary 3.3V logic rail; feeds RESET signal to CPU and FPGA configuration logic. Use Value: Ensures deterministic boot state after AC dropout by holding reset until stable 3.3V is confirmed for ≥200ms. |
| Smart Surveillance Camera | Medical Diagnostic Handheld |
|
Use Scenario: Battery-powered edge AI camera operating from Li-ion (3.0–4.2V) with USB charging. IC Role / Device Role / Timing Role: Low-battery warning and brownout supervisor; WDI tied to application processor GPIO. Use Value: Triggers graceful shutdown before voltage collapse using 2.93V threshold aligned with SoC minimum operating voltage. |
Use Scenario: Portable ultrasound device with backup coin-cell and main LiPo supply. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors main rail for reset, and uses MR for user-initiated self-test reset. Use Value: Internal MR pull-up enables momentary button interface without external R, meeting IEC 62304 safety-critical reset requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3T | Fixed 3.08V threshold, no WDI, SOT23-3 package, 140ms reset pulse | Lacks watchdog functionality; suitable only for basic power-on reset without runtime monitoring | Select when WDI is unnecessary and board space requires 3-pin footprint |
| TPS3808G12DBVR | Adjustable threshold (via external resistor), 200ms pulse, WDI support, SOT23-6 package | Requires external resistor network for threshold setting; higher quiescent current (1.1µA vs 10µA) | Choose when programmable threshold is required and additional pin count is acceptable |
Compared with MAX809TRD3T and TPS3808G12DBVR, PT7M7811RTBEX delivers fixed-precision 2.93V monitoring with integrated WDI and MR in a compact 4-pin SOT143, offering optimal balance of feature set, accuracy, and footprint for cost-sensitive embedded designs.
Availability
PT7M7811RTBEX 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 across extended temperature ranges and long production lifecycles.
Supply support for PT7M7811RTBEX 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, headquartered in Plano, Texas, serving automotive, industrial, computing, and consumer markets with high-reliability components.
The PT7M78xx family targets µP system reliability-designed specifically to replace discrete reset circuits with integrated voltage monitoring, watchdog, and manual reset in minimal footprint for embedded power management.
FAQ
What is the exact reset threshold voltage and its tolerance for PT7M7811RTBEX?
The PT7M7811RTBEX has a nominal reset threshold of 2.93V, with ±2.5% tolerance over the full operating temperature range (–40°C to +85°C). This value is specified in the DC Electrical Characteristics table under VRST (Falling-edge) and verified across production lots per Diodes Inc. datasheet revision 2017-04-0010.
Does PT7M7811RTBEX require an external pull-up resistor on the MR pin?
No. The MR pin includes an internal pull-up resistor of 10–40 kΩ, allowing direct connection of a momentary switch to GND without external components. Leaving MR unconnected defaults it to high, disabling manual reset-no external resistor is needed or recommended.
Can PT7M7811RTBEX operate reliably below 2.0V supply voltage?
Yes. The device guarantees RESET/RESET output validity down to VCC = 1.0V, and operates across 1.0V–5.5V. At 1.0V, RESET remains a valid logic low (≤0.3V at 100µA sink), enabling use in ultra-low-voltage brownout scenarios where other supervisors fail.
What is the watchdog timeout behavior when WDI is left floating?
When WDI is left unconnected (high-impedance), the internal watchdog timer is disabled-no reset is triggered by timeout. This is explicitly stated in the datasheet: "Floating WDI or connecting WDI to a high-impedance three-state buffer disables the watchdog feature." No external pull-up/down is required.
PT7M7811RTBEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Tape & Reel (TR)
- 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
PT7M7811RTBEX FAQ
1.How can I place an order for PT7M7811RTBEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PT7M7811RTBEX 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 PT7M7811RTBEX reliable?
The price and inventory of PT7M7811RTBEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT7M7811RTBEX is usually 5 days.
3.What payment methods are accepted for PT7M7811RTBEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT7M7811RTBEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PT7M7811RTBEX?
PT7M7811RTBEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PT7M7811RTBEX 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 PT7M7811RTBEX?
For technical support, including PT7M7811RTBEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT7M7811RTBEX requirements.
6.How does Aetrix verify that PT7M7811RTBEX is sourced from the original manufacturer or authorized distributors?
All PT7M7811RTBEX 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 PT7M7811RTBEX meets industry standards.
7.What is the process for return or replacement of PT7M7811RTBEX?
All PT7M7811RTBEX units undergo pre-shipment inspection (PSI). If there is an issue with PT7M7811RTBEX, 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 PT7M7811RTBEX part is unused and in its original packaging.
Return procedure for PT7M7811RTBEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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