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Diodes Incorporated PT7M7812MTBEX
- Part No.:
- PT7M7812MTBEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
PT7M7812MTBEX.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,538
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Product details
Overview
PT7M7812MTBEX from Diodes Incorporated is a precision microprocessor (μP) supervisor IC with manual reset and watchdog timer functionality, designed for reliable power-up/power-down/brownout monitoring in embedded systems. It features a 4.38V reset threshold (±2.5% over temperature), 200ms reset pulse width, debounced CMOS-compatible manual-reset input, and active-low push-pull RESET output. Used in server power management to ensure deterministic boot sequencing after AC loss or voltage sag.
For engineers reviewing the PT7M7812MTBEX datasheet, PT7M7812MTBEX pinout, PT7M7812MTBEX application, or PT7M7812MTBEX equivalent, key selection criteria include reset threshold accuracy, manual reset timing behavior, watchdog timeout stability across temperature, and SOT143-4 package compatibility with high-density PCB layouts.
Technical Context
The PT7M7812MTBEX implements a dual-function supervisory architecture: a precision voltage monitor with hysteresis (VRTH = 50mV typical) and a 1.6s watchdog timer triggered by WDI edge transitions. Its internal pull-up resistor on MR (10–40kΩ) enables direct push-button interfacing without external components.
RESET assertion is guaranteed down to VCC = 1.0V, and the output remains valid during brownout recovery with a fixed 200ms timeout after VCC rises above VRST. The device lacks open-drain output - it uses push-pull RESET, distinguishing it from PT7M7803 and enabling direct drive of μP reset inputs without pull-up resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.38V ±2.5% over -40°C to +85°C - ensures accurate detection of 5V rail undervoltage before system instability occurs. |
| Reset Pulse Width | 200ms typ. (140–400ms) - guarantees sufficient reset hold time for full μP initialization and peripheral stabilization. |
| Supply Current | 10–30µA at 5V - enables integration into battery-backed or ultra-low-power systems without significant quiescent load. |
| Watchdog Timeout | 1.6s typ. (1.12–2.25s) - provides robust software liveliness checking while accommodating interrupt latency in real-time firmware. |
| MR Input Pull-up | 10–40kΩ internal - eliminates need for external pull-up, simplifying BOM and reducing board space in compact designs. |
| Operating Voltage Range | 1.0V to 5.5V - supports operation during deep brownout and ensures reset validity even as VCC collapses. |
| Output Type | Push-pull RESET - delivers rail-to-rail logic levels without external biasing, compatible with standard CMOS μP reset inputs. |
Pinout & Package
PT7M7812MTBEX is housed in a 4-pin SOT143-4 surface-mount package (3.0mm × 1.75mm × 1.3mm), optimized for space-constrained industrial and networking applications. Pin 1 is VCC, Pin 2 is GND, Pin 3 is MR (Manual Reset), and Pin 4 is RESET (active-low push-pull output).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Power supply input | Primary supply rail connection; reset assertion begins when voltage drops below 4.38V; guaranteed RESET validity down to 1.0V. |
| GND (Pin 2) | Ground reference | Common return path for all internal circuitry and external reset signaling; must be low-impedance for noise immunity. |
| MR (Pin 3) | Manual reset input | CMOS-compatible active-low input with internal 10–40kΩ pull-up; asserted low forces 200ms reset pulse regardless of VCC level. |
| RESET (Pin 4) | Active-low reset output | Push-pull driver capable of sinking ≥1.2mA at 2.7V; directly interfaces μP reset pins without external components. |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage monitor | 4.38V threshold with ±2.5% tolerance over full industrial temperature range ensures consistent reset behavior across operating environments. |
| Debounced manual reset | Internal MR debouncing eliminates need for external RC filters or firmware debounce logic, reducing design complexity. |
| Watchdog timer | 1.6s timeout with edge-triggered WDI input detects software hangs without requiring periodic register writes or clock gating. |
| Guaranteed reset at low VCC | RESET remains valid down to VCC = 1.0V - critical for detecting final stages of power failure and preventing partial execution. |
| SOT143-4 footprint | 4-pin, 1.75mm width package enables high-density placement in space-limited applications like network interface cards and storage controllers. |
Applications
| Server Power Sequencing | Industrial PLC Controller |
|---|---|
|
Use Scenario: Ensuring orderly boot of multi-rail server motherboards after AC power restoration or hot-swap events. IC Role / Device Role / Timing Role: Monitors 5V standby rail and asserts RESET until stable; manual reset allows field technician-initiated recovery. Use Value: Prevents race conditions between CPU, memory, and I/O initialization by enforcing minimum 200ms reset hold time. |
Use Scenario: Maintaining deterministic startup and fault recovery in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Supervises 3.3V I/O rail and triggers watchdog reset if ladder logic scan cycle stalls due to EMI or code corruption. Use Value: Eliminates need for external reset supervisors or FPGA-based monitoring, reducing BOM count and certification overhead. |
| Network Switch Management | Embedded Storage Controller |
|
Use Scenario: Securing reliable reboot of managed Ethernet switches during firmware updates or thermal shutdown events. IC Role / Device Role / Timing Role: Provides synchronized reset to ARM Cortex-A9 SoC and PHY transceivers using single push-pull RESET signal. Use Value: Push-pull output drives multiple loads simultaneously without voltage droop, avoiding timing skew between subsystems. |
Use Scenario: Enabling fail-safe operation of SATA/NVMe SSD controllers subjected to intermittent power in edge computing gateways. IC Role / Device Role / Timing Role: Detects 5V rail collapse below 4.38V and holds NAND flash controller in reset until power stabilizes. Use Value: Prevents write corruption during brownout by guaranteeing RESET remains asserted until VCC exceeds threshold + hysteresis. |
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 reset threshold, SOT23-3 package, no manual reset or watchdog. | Lacks MR and WDI - suitable only for basic power-on reset, not brownout recovery or software hang detection. | Select when only power-up reset is required and board space is extremely constrained. |
| TPS3808G12DBVR | 4.4V threshold, adjustable delay, 1.8–6V operation, open-drain RESET, no internal MR pull-up. | Requires external pull-up on MR and RESET; higher quiescent current (1.8µA vs 10µA) but wider VCC range. | Choose for designs needing programmable reset delay or operation below 1.0V VCC monitoring. |
Compared with MAX809SEUR+T and TPS3808G12DBVR, PT7M7812MTBEX uniquely integrates manual reset, watchdog, and push-pull output in a 4-pin SOT143 package - delivering full supervisory functionality without external components or layout compromises.
Availability
PT7M7812MTBEX is available at Aetrix Electronics and suitable for server power sequencing, industrial PLC controllers, network switch management, and embedded storage controllers requiring stable component supply across extended product lifecycles.
Supply support for PT7M7812MTBEX 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.
PT7M7812MTBEX belongs to Diodes' μP Supervisor family, engineered specifically for deterministic reset generation and software watchdog supervision in mission-critical embedded systems where power integrity cannot be compromised.
FAQ
What is the exact reset threshold voltage and its tolerance for PT7M7812MTBEX?
The PT7M7812MTBEX has a nominal reset threshold voltage of 4.38V, with a guaranteed tolerance of ±2.5% over the full industrial temperature range (-40°C to +85°C). This value is specified in the DC Electrical Characteristics table under VRST, and applies to both rising and falling VCC transitions with 50mV hysteresis.
Does PT7M7812MTBEX support watchdog functionality, and how is it enabled?
Yes, PT7M7812MTBEX includes a 1.6s watchdog timer activated via the WDI (Watchdog Input) pin. To enable it, connect WDI to a microcontroller GPIO that toggles at least once per 1.6s interval. Leaving WDI unconnected or floating disables the watchdog function entirely, as stated in the Functional Description section.
What is the function of the MR pin, and does it require an external pull-up resistor?
The MR (Manual Reset) pin is an active-low CMOS input with an internal 10–40kΩ pull-up resistor. It requires no external pull-up; connecting a push button between MR and GND generates a clean reset pulse. The internal pull-up ensures MR remains inactive (high) when unconnected, eliminating risk of spurious resets.
Can PT7M7812MTBEX operate reliably during deep brownout conditions?
Yes - PT7M7812MTBEX guarantees valid RESET output down to VCC = 1.0V, and its reset assertion remains active until VCC falls below this level. This ensures the microprocessor stays held in reset throughout the entire power collapse phase, preventing erratic execution during marginal supply conditions.
PT7M7812MTBEX 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:
- 4.38V
- 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-143-4
PT7M7812MTBEX FAQ
1.How can I place an order for PT7M7812MTBEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PT7M7812MTBEX 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 PT7M7812MTBEX reliable?
The price and inventory of PT7M7812MTBEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT7M7812MTBEX is usually 5 days.
3.What payment methods are accepted for PT7M7812MTBEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT7M7812MTBEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PT7M7812MTBEX?
PT7M7812MTBEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PT7M7812MTBEX 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 PT7M7812MTBEX?
For technical support, including PT7M7812MTBEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT7M7812MTBEX requirements.
6.How does Aetrix verify that PT7M7812MTBEX is sourced from the original manufacturer or authorized distributors?
All PT7M7812MTBEX 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 PT7M7812MTBEX meets industry standards.
7.What is the process for return or replacement of PT7M7812MTBEX?
All PT7M7812MTBEX units undergo pre-shipment inspection (PSI). If there is an issue with PT7M7812MTBEX, 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 PT7M7812MTBEX part is unused and in its original packaging.
Return procedure for PT7M7812MTBEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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