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Diodes Incorporated PT7M7812RTAEX
- Part No.:
- PT7M7812RTAEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
PT7M7812RTAEX.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,721
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Product details
Overview
PT7M7812RTAEX from Diodes Incorporated is a precision microprocessor (μP) supervisor IC with 4.63V reset threshold, 200ms reset pulse width, debounced manual-reset input, and watchdog timer functionality. It monitors VCC supply voltage in embedded systems, asserts active-low RESET during power-up/brownout, and supports manual reset and watchdog timeout detection for reliable system initialization in industrial controllers and network equipment.
For engineers reviewing the PT7M7812RTAEX datasheet, PT7M7812RTAEX pinout, PT7M7812RTAEX application, or PT7M7812RTAEX equivalent, key selection criteria include its 4.63V threshold accuracy (±2.5% over −40°C to +85°C), SOT23-5 package compatibility, MR/WDI dual-input supervision, and guaranteed RESET validity down to VCC = 1.0V.
Technical Context
The PT7M7812RTAEX implements a precision voltage monitor with hysteresis (50mV typical) and a 200ms internal reset timeout timer. Its reset assertion logic responds to falling VCC below 4.63V (VRST), rising VCC above VRST, MR low-to-high transition, or watchdog timeout - all triggering a guaranteed 140–400ms active-low RESET pulse.
It integrates a debounced CMOS-compatible manual-reset input (MR) with internal 10–40kΩ pull-up and a watchdog input (WDI) that detects edges or sustained high/low states exceeding 1.12–2.25s. The device operates across 1.0V–5.5V VCC and guarantees RESET/RESET output validity at VCC ≥ 1.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.63V ±2.5% (−40°C to +85°C); ensures reliable brownout detection for 5V systems |
| Reset Pulse Width | 200ms typ. (140–400ms); provides sufficient time for μP initialization and peripheral stabilization |
| Supply Voltage Range | 1.0V to 5.5V; enables operation during deep brownout and compatibility with wide-input power rails |
| Quiescent Current | 10–30µA at 5V; minimizes standby power impact in battery-backed or energy-sensitive applications |
| Manual Reset Input | CMOS-compatible, internally pulled up (10–40kΩ); eliminates external resistor requirement for push-button reset |
| Watchdog Timeout Period | 1.6s typ. (1.12–2.25s); matches typical firmware watchdog service intervals without requiring external timing components |
| Operating Temperature | −40°C to +85°C; qualified for industrial-grade embedded and networking equipment environments |
Pinout & Package
SOT23-5 surface-mount package with 1.3mm × 2.9mm footprint, 0.95mm height, and standard lead pitch (0.95mm). RoHS-compliant, Pb-free, tape-and-reel delivery (TA suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | Power supply input | Primary supply rail; RESET asserted when VCC falls below 4.63V or rises above it (with 200ms delay) |
| 2: GND | Ground reference | Common return path for all internal circuitry and output drivers; required for accurate threshold sensing |
| 3: RESET | Active-low reset output | Push-pull output; drives low during reset conditions and remains valid down to VCC = 1.0V |
| 4: MR | Manual-reset input | CMOS-compatible, active-low; debounced internally; initiates reset pulse on low-to-high release |
| 5: WDI | Watchdog input | Edge-sensitive CMOS input; clears watchdog timer on rising/falling edge; disabled if left floating |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.63V reset threshold | ±2.5% tolerance over full temperature range ensures consistent brownout response in 5V systems |
| 200ms programmable reset timeout | Fixed internal timer guarantees minimum reset duration for safe μP boot sequence execution |
| Integrated MR debouncing | Eliminates need for external RC filter or firmware debounce logic in push-button reset circuits |
| Watchdog timer with edge-triggered WDI | Detects 150ns pulses; prevents false resets from noise while enabling flexible firmware watchdog service |
| VCC = 1.0V RESET validity | Enables robust reset assertion even during severe undervoltage conditions before power collapse |
Applications
| Industrial PLC Controller | Network Switch Power Management |
|---|---|
Use Scenario: Monitors 5V auxiliary rail in programmable logic controller CPU module during AC mains fluctuation or backup battery switchover. IC Role / Device Role / Timing Role: μP supervisor providing power-on reset, brownout protection, and manual recovery via front-panel button. Use Value: Prevents corrupted firmware execution during voltage sag by asserting RESET until VCC stabilizes above 4.63V for 200ms. |
Use Scenario: Supervises main 5V supply in managed Ethernet switch ASIC power domain during hot-swap or PoE negotiation transients. IC Role / Device Role / Timing Role: Dual-function supervisor with MR for field service reset and WDI for ASIC firmware health monitoring. Use Value: Guarantees clean restart after watchdog timeout or manual intervention, avoiding packet loss or port flapping. |
| Server BMC Power Sequencing | Embedded Security Gateway |
Use Scenario: Controls reset sequencing of Baseboard Management Controller (BMC) during 3.3V/5V rail ramp-up in rack server motherboard. IC Role / Device Role / Timing Role: Precision voltage monitor ensuring BMC enters known state only after stable 5V supply is confirmed. Use Value: Eliminates need for discrete comparator + RC timer; reduces BOM count and improves timing repeatability. |
Use Scenario: Provides fail-safe reset for cryptographic co-processor in physical access control gateway during battery-backed operation. IC Role / Device Role / Timing Role: Supervisor with VCC monitoring and manual reset for tamper-response recovery and low-battery warning signaling. Use Value: Maintains secure state integrity by holding processor in reset during undervoltage, preventing key leakage or state corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar μP supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUR+T | 4.63V threshold, 240ms reset pulse, no WDI or MR; SOT23-3 package | Lacks watchdog and manual reset; suitable only for basic power-on reset in space-constrained designs | Select when watchdog/MR functions are unnecessary and board area is critical |
| TPS3808G33DBVR | 3.3V threshold, adjustable reset delay (200ms/400ms), WDI support, SOT23-6 | Lower threshold targets 3.3V systems; requires external capacitor for delay tuning | Choose for 3.3V domains needing configurable timing or higher drive strength (100mA sink) |
Compared with MAX809SEUR+T and TPS3808G33DBVR, PT7M7812RTAEX uniquely combines 4.63V precision threshold, integrated MR debouncing, and edge-sensitive WDI in a 5-pin SOT23 - enabling full-featured supervision without external components in 5V industrial systems.
Availability
PT7M7812RTAEX is available at Aetrix Electronics and suitable for industrial PLC controllers, network switch power management, server BMC power sequencing, and embedded security gateways requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for PT7M7812RTAEX 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 microprocessor system supervision - delivering precision voltage monitoring, watchdog safety, and manual reset in minimal footprint packages for space- and reliability-critical embedded applications.
FAQ
Does PT7M7812RTAEX support open-drain RESET output?
No. PT7M7812RTAEX features a push-pull RESET output, as confirmed in the Function Comparison Table and Pin Configuration diagrams. Only PT7M7803 variants provide open-drain RESET; PT7M7812 uses active-pullup/pulldown for stronger drive capability and direct interface with standard μP reset inputs.
What is the internal pull-up resistance on the MR pin?
The MR pin has an internal pull-up resistor ranging from 10kΩ to 40kΩ, as specified in the DC Electrical Characteristics table under "r MR pull-up resistor". This allows direct connection of a momentary switch to GND without external components, simplifying PCB layout and reducing BOM cost.
Can the watchdog timer be disabled without connecting WDI?
Yes. Leaving WDI unconnected (floating) disables the watchdog function, as stated in the Functional Description: "Floating WDI or connecting WDI to a high-impedance three-state buffer disables the watchdog feature." No pull-up or pull-down is required - the internal circuitry treats floating WDI as inactive.
Is PT7M7812RTAEX compatible with 3.3V I/O systems?
Yes. While its reset threshold is 4.63V, PT7M7812RTAEX operates with VCC from 1.0V to 5.5V and accepts CMOS-level MR/WDI inputs (VIH = 0.7×VCC, VIL = 0.3×VCC). When powered from 3.3V, it correctly interprets 3.3V logic levels and asserts RESET based on its internal 4.63V reference - making it suitable for mixed-voltage supervision where 5V rail monitoring is needed alongside 3.3V logic.
PT7M7812RTAEX 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:
- 2.63V
- 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:
- SOT-23-5
PT7M7812RTAEX FAQ
1.How can I place an order for PT7M7812RTAEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PT7M7812RTAEX 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 PT7M7812RTAEX reliable?
The price and inventory of PT7M7812RTAEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT7M7812RTAEX is usually 5 days.
3.What payment methods are accepted for PT7M7812RTAEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT7M7812RTAEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PT7M7812RTAEX?
PT7M7812RTAEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PT7M7812RTAEX 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 PT7M7812RTAEX?
For technical support, including PT7M7812RTAEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT7M7812RTAEX requirements.
6.How does Aetrix verify that PT7M7812RTAEX is sourced from the original manufacturer or authorized distributors?
All PT7M7812RTAEX 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 PT7M7812RTAEX meets industry standards.
7.What is the process for return or replacement of PT7M7812RTAEX?
All PT7M7812RTAEX units undergo pre-shipment inspection (PSI). If there is an issue with PT7M7812RTAEX, 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 PT7M7812RTAEX part is unused and in its original packaging.
Return procedure for PT7M7812RTAEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PT7M7812RTAEX Tags
-
MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
Diodes Incorporated
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APX803L20-29SA-7
Diodes Incorporated
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EM6325CXSP5B-2.9+
EM Microelectronic
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MCP120T-300I/TT
Microchip Technology
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MCP130T-315I/TT
Microchip Technology
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MCP120T-475I/TT
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MCP111T-300E/TT
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MCP120T-315I/TT
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