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

Diodes Incorporated PT7A7515WEX

Name: PT7A7515WEX
Brand: Diodes Incorporated
SKU: PT7A7515WEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PT7A7515WEX

Manufacturer:: Diodes Incorporated

Category:: Supervisors

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

Datasheet:: PT7A7515WEX.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:1,050

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Product details

Overview

PT7A7515WEX from Diodes Incorporated is a precision μP supervisor IC with 2.63V reset threshold, active-low RESET output, 200ms reset pulse width, debounced manual reset input, and integrated watchdog timer (1.6s timeout). It monitors V_CC during power-up/down/brownout in microprocessor systems and provides low-voltage detection via PFI/PFO for battery or power-fail warning in embedded control applications.

For engineers reviewing the PT7A7515WEX datasheet, PT7A7515WEX pinout, PT7A7515WEX application, or PT7A7515WEX equivalent, key selection criteria include guaranteed RESET validity down to V_CC = 1.2V, 1.25V PFI threshold accuracy, SOIC-8 package compatibility, and watchdog timer behavior when WDI is unconnected or tied to MR.

Technical Context

The PT7A7515WEX implements a precision bandgap-based voltage monitor with ±1.5% reset threshold tolerance at 2.63V nominal, ensuring reliable brownout detection across -40°C to +85°C. Its internal 200ms one-shot timer guarantees minimum reset assertion duration independent of supply ramp rate.

A dedicated 1.6s watchdog timer monitors WDI transitions; it clears on any MR assertion or WDI edge and asserts WDO low only upon timeout - unless disabled by floating WDI. The PFI comparator uses a trimmed 1.25V reference with ±20mV threshold accuracy to drive open-drain PFO for external power-fail signaling.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold	2.63V ±1.5% - ensures reliable brownout detection at 2.59V–2.67V under full temperature range
Reset Pulse Width	200ms typ. - guarantees sufficient processor initialization time after power stabilization
Watchdog Timeout	1.6s typ. - provides robust firmware hang detection without false triggers from short glitches
PFI Threshold	1.25V ±20mV - enables accurate low-battery or power-fail warning with minimal external components
Supply Current	30µA typ. at 3.0V - supports ultra-low-power operation in battery-backed systems
V_CC Operating Range	2.7V to 5.5V - compatible with 3.0V and 3.3V microcontroller rails
RESET Validity	Down to V_CC = 1.2V - ensures deterministic reset state during deep undervoltage conditions

Pinout & Package

PT7A7515WEX is housed in an 8-pin SOIC (W) package - 150mil width, surface-mount, RoHS-compliant, lead-free, halogen-free.

Pin/Terminal	Circuit Role	Design Meaning
MR	Manual Reset Input	Active-low TTL/CMOS-compatible trigger with 250µA internal pull-up; debounced by 200ms reset timing
V_CC	Power Supply	Primary supply rail (2.7–5.5V); powers all internal comparators, timer, and outputs
GND	Ground Reference	Common return path for all analog and digital circuitry; must be low-impedance
PFI	Power-Fail Input	Monitors external voltage against 1.25V reference; drives PFO low when input falls below threshold
WDO	Watchdog Output	Open-drain output asserting low on watchdog timeout or V_CC brownout; no minimum pulse width
RESET	Reset Output	Active-low open-drain output with guaranteed 200ms pulse width and validity down to V_CC = 1.2V
WDI	Watchdog Input	Edge-sensitive input; watchdog timer resets on rising/falling edges or high-impedance state
PFO	Power-Fail Output	Open-drain output asserting low when PFI < 1.25V; used for system-level low-voltage warning

Key Features

Feature	Design Value
Precision Voltage Monitoring	±1.5% reset threshold tolerance ensures consistent brownout response across temperature and voltage
Guaranteed Low-Voltage Reset	RESET remains valid and functional even as V_CC drops to 1.2V - critical for graceful shutdown
Integrated Watchdog Timer	1.6s timeout with automatic clearing on MR assertion or WDI activity - eliminates need for external timer IC
Debounced Manual Reset	250µA internal MR pull-up enables direct switch connection without external RC network or Schmitt trigger
Low-Power Operation	30µA typical supply current at 3.0V allows use in always-on battery monitoring circuits

Applications

Industrial PLC Controller

Automotive Body Control Module

Use Scenario: Microcontroller supervises I/O expansion, CAN communication, and relay drivers in harsh industrial environments with wide temperature swings and noisy power rails.

IC Role / Device Role / Timing Role: Primary reset supervisor ensuring safe boot and brownout recovery; PFO monitors 12V-to-3.3V DC-DC converter output for early failure detection.

Use Value: 2.63V threshold matches 3.0V MCU V_CC margin; 200ms reset pulse prevents spurious execution during unstable power ramp-up.

Use Scenario: MCU manages door locks, lighting, and window controls powered by vehicle battery with variable voltage (9–16V) and cold-cranking dips.

IC Role / Device Role / Timing Role: Resets MCU during cranking-induced brownouts; PFI senses backup battery voltage to trigger low-power mode before shutdown.

Use Value: Guaranteed RESET validity at V_CC = 1.2V enables controlled state save during deep undervoltage events.

Medical Infusion Pump

Smart Energy Meter

Use Scenario: Safety-critical MCU controls motor actuation, pressure sensing, and alarm generation; requires deterministic reset behavior under battery backup.

IC Role / Device Role / Timing Role: Supervises main 3.3V rail and monitors Li-ion backup cell voltage via PFI to initiate graceful shutdown before cutoff.

Use Value: 1.25V PFI threshold aligns with Li-ion discharge curve; ±20mV accuracy avoids premature or delayed warnings.

Use Scenario: MCU samples metering ICs and communicates via PLC or RF; operates continuously on mains or supercapacitor backup.

IC Role / Device Role / Timing Role: Detects AC loss via PFI-driven PFO signal; asserts RESET to halt measurement and preserve flash integrity during power interruption.

Use Value: 200ms reset pulse ensures EEPROM write completion before power collapse; low 30µA ICC extends backup runtime.

Equivalent & Alternatives

The following parts are listed as comparable options for similar μP supervisor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6326UT26D3+	2.63V reset threshold, active-low, 200ms pulse, no watchdog timer, SOT23-5 package	Lacks integrated watchdog; requires external circuitry for firmware supervision	Select when board space is constrained and watchdog functionality is handled elsewhere
TPS3808G33DBVR	3.3V reset threshold, active-low, 200ms pulse, adjustable watchdog (1.25ms–10s), SOT23-6 package	Higher reset threshold unsuitable for 3.0V systems; programmable watchdog adds flexibility but increases BOM count	Select when system uses 3.3V rail and requires configurable timeout, not fixed 1.6s

Compared with MAX6326UT26D3+ and TPS3808G33DBVR, PT7A7515WEX uniquely combines 2.63V threshold, guaranteed 1.2V reset validity, and integrated 1.6s watchdog in SOIC-8 - enabling single-chip supervision for 3.0V microcontrollers without external timing components.

Availability

PT7A7515WEX is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply and long-term lifecycle support.

Supply support for PT7A7515WEX 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 computing markets.

The PT7A75xx family targets microprocessor supervision in resource-constrained embedded systems, delivering precision voltage monitoring, manual reset, watchdog, and power-fail detection in compact SOIC packages - optimized for cost-sensitive, high-volume applications.

FAQ

Can PT7A7515WEX be used with a 3.0V microcontroller?

Yes. PT7A7515WEX operates over 2.7V to 5.5V and features a 2.63V reset threshold with ±1.5% tolerance, making it ideal for 3.0V systems where brownout detection must occur before the MCU fails. Its RESET output remains valid down to V_CC = 1.2V, ensuring deterministic behavior during deep undervoltage events common in battery-powered designs.

How does the watchdog timer interact with the manual reset input?

The watchdog timer clears automatically whenever MR is asserted (pulled low), preventing false timeouts during system initialization or debug resets. When MR returns high, the timer restarts only if WDI is actively driven - floating WDI disables the watchdog entirely, allowing WDO to function solely as a low-line indicator synchronized with V_CC brownout.

What is the purpose of the PFI and PFO pins?

PFI accepts an external voltage to compare against an internal 1.25V reference; when PFI falls below this threshold, PFO pulls low to signal power failure or low battery. Unlike RESET, PFO has no timing delay - it responds immediately, enabling real-time warning for backup power activation or data preservation before shutdown.

Is PT7A7515WEX qualified for automotive applications?

PT7A7515WEX is not AEC-Q100 qualified. Diodes Incorporated offers automotive-grade variants (e.g., PT7A7515WEX-A) with PPAP documentation, IATF 16949 manufacturing, and extended temperature validation. For non-safety-critical automotive subsystems operating within -40°C to +85°C, the standard part may be used subject to customer qualification.

PT7A7515WEX 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:: 2.63V

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

PT7A7515WEX FAQ

1.How can I place an order for PT7A7515WEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PT7A7515WEX 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 PT7A7515WEX reliable?

The price and inventory of PT7A7515WEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT7A7515WEX is usually 5 days.

3.What payment methods are accepted for PT7A7515WEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT7A7515WEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PT7A7515WEX?

PT7A7515WEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PT7A7515WEX 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 PT7A7515WEX?

For technical support, including PT7A7515WEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT7A7515WEX requirements.

6.How does Aetrix verify that PT7A7515WEX is sourced from the original manufacturer or authorized distributors?

All PT7A7515WEX 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 PT7A7515WEX meets industry standards.

7.What is the process for return or replacement of PT7A7515WEX?

All PT7A7515WEX units undergo pre-shipment inspection (PSI). If there is an issue with PT7A7515WEX, 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 PT7A7515WEX part is unused and in its original packaging.

Return procedure for PT7A7515WEX:

1.Submit a request within 90 days.

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

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