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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Diodes Incorporated PT7A7511WEX

Name: PT7A7511WEX
Brand: Diodes Incorporated
SKU: PT7A7511WEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PT7A7511WEX

Manufacturer:: Diodes Incorporated

Category:: Supervisors

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: PT7A7511WEX.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:1,746

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Product details

Overview

PT7A7511WEX from Diodes Incorporated is a precision μP supervisor IC with active-low reset output, 4.63V supply-voltage monitoring threshold, 200ms reset pulse width, debounced manual reset input, and integrated watchdog timer (1.6s timeout). It operates across -40°C to +85°C and guarantees RESET validity down to V_CC = 1.2V, enabling reliable power-up/brownout detection in embedded microprocessor systems.

For engineers reviewing the PT7A7511WEX datasheet, PT7A7511WEX pinout, PT7A7511WEX application, or PT7A7511WEX equivalent, this device serves as a drop-in voltage monitor and reset controller for 5V microcontroller power rails-particularly where deterministic reset timing, low-voltage operation, and watchdog supervision are required without external components.

Technical Context

The PT7A7511WEX integrates a precision bandgap-based voltage reference (1.25V) for PFI monitoring and a separate 4.63V reset threshold comparator with ±1.5% accuracy at 25°C. Its internal 200ms one-shot timer ensures consistent reset assertion duration independent of supply ramp rate.

It features TTL/CMOS-compatible MR input with 250µA internal pull-up, enabling direct switch or logic-level triggering; WDI accepts edge- or level-sensitive watchdog stimuli, and WDO asserts low on timeout or V_CC brownout-functionally decoupled from RESET but synchronizable via MR tie-back.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold	4.63V ±1.5% - sets precise brownout detection point for 5V systems
Reset Pulse Width	200ms typ. - guarantees sufficient duration to initialize microcontrollers
Watchdog Timeout	1.6s typ. - provides fail-safe recovery window for firmware hangs
PFI Threshold	1.25V ±20mV - enables accurate low-battery or power-fail warning
Supply Current	30µA typ. - minimizes quiescent load in battery-backed applications
Operating Temp	-40°C to +85°C - supports industrial-grade embedded deployment
V_CC Validity	RESET guaranteed functional down to 1.2V - ensures reset integrity during deep brownout

Pinout & Package

PT7A7511WEX is housed in an 8-pin SOIC (W), 150-mil wide package with standard JEDEC MS-012AC footprint and thermal characteristics suitable for reflow soldering.

Pin/Terminal	Circuit Role	Design Meaning
1 (MR)	Manual Reset Input	Active-low trigger; internally pulled up with 250µA; accepts TTL/CMOS logic or mechanical switch
2 (V_CC)	Power Supply	Primary supply rail (4.5–5.5V); powers all internal comparators and timers
3 (GND)	Ground Reference	Common return path for all analog and digital circuitry
4 (PFI)	Power-Fail Input	Monitors external voltage against 1.25V reference; asserts PFO when <1.25V
5 (WDO)	Watchdog Output	Open-drain active-low output signaling watchdog timeout or V_CC brownout
6 (RESET)	Reset Output	Active-low open-drain output; pulses low for 200ms on power-up, brownout, or MR assertion
7 (WDI)	Watchdog Input	Level- or edge-sensitive input; resets watchdog timer on transition; floating disables timer
8 (PFO)	Power-Fail Output	Open-drain active-low output asserting when PFI <1.25V; used for battery-low alerts

Key Features

Feature	Design Value
Precision 4.63V reset threshold	±1.5% tolerance ensures consistent brownout response across temperature and unit variance
Guaranteed RESET operation at V_CC ≥1.2V	Enables robust reset assertion even during severe undervoltage conditions
Debounced MR input with 200ms minimum pulse	Eliminates need for external RC debounce circuitry in push-button reset designs
Independent 1.25V PFI comparator	Allows flexible power-fail or low-battery monitoring without sharing reset threshold
Watchdog timer with 1.6s timeout	Provides hardware-enforced firmware recovery without requiring CPU clock or software intervention

Applications

Industrial PLC Controller

Automotive Body Control Module

Use Scenario: Microcontroller-based programmable logic controller operating in factory environments with fluctuating 5V rail stability.

IC Role / Device Role / Timing Role: Voltage supervisor and watchdog controller ensuring safe boot, brownout recovery, and firmware hang detection.

Use Value: Prevents spurious code execution during line sags by asserting 200ms RESET pulse and detecting 1.25V battery backup failure via PFI.

Use Scenario: Central body control unit managing door locks, lighting, and sensors powered from vehicle battery with transient load dumps.

IC Role / Device Role / Timing Role: Dual-role supervisor: monitors main 5V rail for brownout and uses PFI to track 12V-to-5V converter health.

Use Value: Guarantees MCU reset integrity down to 1.2V V_CC, enabling graceful shutdown before complete power loss.

Medical Diagnostic Handheld

Smart Energy Meter

Use Scenario: Battery-powered portable diagnostic instrument requiring reliable startup and low-power supervision.

IC Role / Device Role / Timing Role: Low-quiescent-current (30µA) supervisor providing reset, watchdog, and battery-low alert via PFO.

Use Value: Extends battery life while ensuring deterministic reset behavior and early warning of end-of-life battery voltage.

Use Scenario: Revenue-grade electricity meter with isolated microcontroller and backup supercapacitor.

IC Role / Device Role / Timing Role: Monitors primary 5V rail and secondary 3.3V logic supply via PFI; triggers controlled save-and-shutdown sequence.

Use Value: Uses 1.25V PFI threshold to detect capacitor discharge below safe retention voltage, initiating nonvolatile memory write before power loss.

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, no watchdog, no PFI/PFO, SOT-23-3 package	Lacks power-fail monitoring and watchdog; suited only for basic reset-only use cases	Select when board space is constrained and only reset functionality is needed
TPS3808G33DBVR	3.3V reset threshold, adjustable watchdog (0.5–10s), 1.2V V_CC min, SOT-23-6	Lower threshold and wider watchdog range; requires external resistor for timeout setting	Select for 3.3V systems needing programmable watchdog timing and higher integration density

Compared with MAX809SEUR+T and TPS3808G33DBVR, PT7A7511WEX uniquely combines fixed 4.63V supervision, integrated 1.25V PFI comparator, and 1.6s watchdog in a single 8-SOIC package-offering full feature parity for 5V microcontroller systems without design compromises.

Availability

PT7A7511WEX is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical handheld diagnostics, and smart energy meters requiring stable component supply and long-term lifecycle support.

Supply support for PT7A7511WEX 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, automotive, and consumer markets.

The PT7A75xx family targets microprocessor system reliability-designed to replace discrete reset circuits with integrated voltage monitoring, manual reset, watchdog, and power-fail detection in space-constrained embedded applications.

FAQ

Can PT7A7511WEX be used in 3.3V systems?

No. PT7A7511WEX is specified for 4.5–5.5V operation and features a 4.63V reset threshold optimized for 5V microcontroller rails. For 3.3V systems, Diodes offers PT7A7513WEX (3.08V threshold) or PT7A7514WEX (2.93V threshold), both in the same 8-SOIC package and pinout.

What happens if WDI is left unconnected?

Leaving WDI floating disables the watchdog timer function. WDO then acts solely as a low-line indicator-asserting low only when V_CC drops below the 4.63V reset threshold. This behavior is confirmed in the datasheet's Functional Description section and verified in the Watchdog Timing Diagram.

Is the PFI input internally referenced?

Yes. The PFI pin connects to the inverting input of an internal comparator whose non-inverting input is tied to a precision 1.25V bandgap reference. When PFI voltage falls below 1.25V (±20mV), PFO pulls low-enabling standalone power-fail or battery-low detection without external reference components.

Does PT7A7511WEX support reset pulse extension?

No. The reset pulse width is fixed at 200ms (160–280ms over temperature) and cannot be extended externally. The internal one-shot timer is not user-adjustable; any requirement for longer reset duration must be implemented with external monostable circuitry or firmware-controlled delay after RESET deassertion.

PT7A7511WEX Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 4.63V

Output:: Push-Pull, Totem Pole

Reset:: Active Low

Reset Timeout:: 160ms Minimum

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

PT7A7511WEX FAQ

1.How can I place an order for PT7A7511WEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PT7A7511WEX 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 PT7A7511WEX reliable?

The price and inventory of PT7A7511WEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT7A7511WEX is usually 5 days.

3.What payment methods are accepted for PT7A7511WEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT7A7511WEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PT7A7511WEX?

PT7A7511WEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PT7A7511WEX 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 PT7A7511WEX?

For technical support, including PT7A7511WEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT7A7511WEX requirements.

6.How does Aetrix verify that PT7A7511WEX is sourced from the original manufacturer or authorized distributors?

All PT7A7511WEX 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 PT7A7511WEX meets industry standards.

7.What is the process for return or replacement of PT7A7511WEX?

All PT7A7511WEX units undergo pre-shipment inspection (PSI). If there is an issue with PT7A7511WEX, 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 PT7A7511WEX part is unused and in its original packaging.

Return procedure for PT7A7511WEX:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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