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

Diodes Incorporated PT7A7514WEX

Name: PT7A7514WEX
Brand: Diodes Incorporated
SKU: PT7A7514WEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PT7A7514WEX

Manufacturer:: Diodes Incorporated

Category:: Supervisors

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

Datasheet:: PT7A7514WEX.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:1,646

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Product details

Overview

PT7A7514WEX from Diodes Incorporated is a precision μP supervisor IC with 2.93V reset threshold, active-low RESET output, 200ms reset pulse width, and integrated watchdog timer (1.6s timeout). It monitors V_CC during power-up/down/brownout in microprocessor systems and provides power-fail detection via 1.25V PFI comparator - used in industrial control modules requiring reliable cold-start sequencing and brownout immunity.

For engineers reviewing the PT7A7514WEX datasheet, PT7A7514WEX pinout, PT7A7514WEX application, or PT7A7514WEX equivalent, key selection criteria include guaranteed RESET validity down to V_CC = 1.2V, TTL/CMOS-compatible manual reset input, debounced MR interface, and SOIC-8 packaging for space-constrained embedded designs.

Technical Context

The PT7A7514WEX implements a precision bandgap-based voltage monitor with ±1.5% reset threshold tolerance at 2.93V nominal, ensuring accurate brownout detection across -40°C to +85°C. Its internal 200ms one-shot timer guarantees minimum reset assertion duration independent of supply ramp rate.

It integrates a 1.6s watchdog timer with edge-sensitive WDI input and open-drain WDO output, plus a dedicated 1.25V reference-based power-fail comparator (PFI/PFO) that operates independently of reset logic - enabling low-battery warning without affecting system reset behavior.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold	2.93V ±1.5% - ensures reliable brownout detection at 3.3V rail with margin against noise-induced false resets
Reset Pulse Width	200ms typ. - meets minimum reset hold time for ARM Cortex-M0/M3 and legacy 8051 microcontrollers
Supply Voltage Range	3.0V to 5.5V - supports operation across 3.3V and 5V logic domains without external level shifting
Watchdog Timeout	1.6s typ. - provides sufficient window for firmware watchdog servicing in real-time control loops
PFI Threshold	1.25V ±20mV - enables accurate low-battery detection when monitoring divided battery voltage
Quiescent Current	30µA typ. - minimizes standby power in battery-backed systems such as smart sensors and metering endpoints
RESET Validity	Down to V_CC = 1.2V - guarantees reset assertion during deep undervoltage conditions before silicon latch-up

Pinout & Package

PT7A7514WEX is housed in an 8-pin SOIC (150mil wide), RoHS-compliant, lead-free package with standard JEDEC MS-012AC footprint and thermal performance suitable for reflow soldering in industrial PCB assemblies.

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 timer
V_CC	Positive Supply	Primary power input (3.0–5.5V); powers all internal comparators, timer, and output drivers
GND	Ground Reference	Common return path for all analog and digital circuitry; must be low-impedance for noise immunity
PFI	Power-Fail Input	Analog input referenced to 1.25V internal bandgap; asserts PFO low when voltage drops below threshold
WDO	Watchdog Output	Open-drain output pulled low on timeout or V_CC brownout; requires external pull-up for NMI interrupt use
RESET	Reset Output	Active-low open-drain output; asserted for ≥200ms during power-up, brownout, or MR activation
WDI	Watchdog Input	Edge-sensitive input; toggling within 1.6s clears watchdog timer; floating disables watchdog function
PFO	Power-Fail Output	Open-drain output low when PFI < 1.25V; used for battery-low alerts or auxiliary shutdown signaling

Key Features

Feature	Design Value
Precision reset threshold	2.93V ±1.5% over full temperature range ensures consistent brownout response in automotive under-hood environments
Guaranteed RESET at low V_CC	Valid down to 1.2V supply enables fail-safe reset assertion even during severe undervoltage transients
Integrated power-fail comparator	Dedicated 1.25V reference and PFI/PFO pair allows independent low-battery monitoring without loading reset circuitry
Debounced manual reset	250µA internal MR pull-up eliminates need for external RC network while supporting push-button and logic-level triggering
Watchdog with edge sensitivity	Accepts >50ns pulses on WDI - compatible with fast GPIO toggling in modern MCUs without timing-critical software overhead

Applications

Industrial PLC I/O Module

Smart Energy Meter

Use Scenario: Power cycling during field maintenance or grid voltage sags.

IC Role / Device Role / Timing Role: Supervisor ensures MCU remains held in reset until stable 3.3V rail is established post-sag.

Use Value: Prevents corrupted EEPROM writes and spurious relay actuation during marginal supply conditions.

Use Scenario: Battery-backed real-time clock and metrology ASIC operation during AC mains failure.

IC Role / Device Role / Timing Role: PFI monitors divided battery voltage; PFO triggers backup mode entry before brownout.

Use Value: Enables seamless transition to battery power with no data loss in billing registers or time stamps.

Automotive Body Control Module

Medical Patient Monitor

Use Scenario: Cold cranking with battery voltage dipping to 2.8V.

IC Role / Device Role / Timing Role: Resets MCU only when V_CC falls below 2.93V - avoids nuisance resets during transient dips.

Use Value: Maintains CAN communication continuity and lamp control state during engine start.

Use Scenario: Dual-supply system with main DC input and backup coin cell.

IC Role / Device Role / Timing Role: Monitors both supplies: RESET ensures safe boot on main rail; PFO warns of coin cell depletion.

Use Value: Supports FDA-required "low-battery alert" functionality without adding discrete comparators.

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	2.93V reset threshold, no watchdog, no PFI/PFO, SOT-23-3 package	Lacks power-fail detection and watchdog - suitable only for basic reset-only use cases	Select when board space is critical and supervisory features beyond reset are handled elsewhere
TPS3808G18DBVR	1.8V reset threshold, adjustable delay, no PFI, 6-pin SOT-23	Lower threshold and no power-fail comparator - incompatible with 3.3V brownout detection	Choose only if system operates at ≤2.5V and requires programmable reset delay

Compared with MAX809SEUR+T and TPS3808G18DBVR, PT7A7514WEX uniquely combines 2.93V precision reset, integrated watchdog, and independent power-fail detection in a single SOIC-8 package - eliminating three discrete components in 3.3V industrial and automotive designs.

Availability

PT7A7514WEX is available at Aetrix Electronics and suitable for industrial PLCs, smart energy meters, automotive body controllers, and medical patient monitors requiring stable component supply and long-term lifecycle support.

Supply support for PT7A7514WEX 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 series belongs to Diodes' μP supervisor product line, engineered specifically for deterministic reset timing, low-voltage operation, and integrated fault-monitoring functions in resource-constrained embedded systems.

FAQ

Can PT7A7514WEX be used with a 3.3V microcontroller?

Yes. PT7A7514WEX operates from 3.0V to 5.5V and features a 2.93V reset threshold with ±1.5% tolerance - providing 70mV margin above typical 3.3V rail dropout, ensuring robust brownout detection without premature reset assertion during normal 3.3V operation.

Does the watchdog timer require external components?

No. The 1.6s watchdog timer is fully internal and requires only a clean WDI signal from the MCU. Floating WDI disables the watchdog; connecting WDI to a GPIO pin and toggling it within 1.6s clears the timer. No capacitors or resistors are needed for timing.

What is the function of the PFI and PFO pins?

PFI is an analog input referenced to an internal 1.25V bandgap. When voltage at PFI drops below 1.25V, PFO (open-drain) pulls low. This enables standalone low-battery or power-fail detection - e.g., monitoring a resistor-divided battery voltage - independent of the reset function.

Is PT7A7514WEX qualified for automotive applications?

PT7A7514WEX is not AEC-Q100 qualified. Diodes Incorporated offers automotive-grade variants (e.g., PT7A7514WEX-13) with PPAP documentation and IATF 16949 manufacturing - contact Aetrix Electronics for qualified alternatives meeting AEC-Q100 Grade 2 (-40°C to +105°C) requirements.

PT7A7514WEX Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 2.93V

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

PT7A7514WEX FAQ

1.How can I place an order for PT7A7514WEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PT7A7514WEX 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 PT7A7514WEX reliable?

The price and inventory of PT7A7514WEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT7A7514WEX is usually 5 days.

3.What payment methods are accepted for PT7A7514WEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT7A7514WEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PT7A7514WEX?

PT7A7514WEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PT7A7514WEX 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 PT7A7514WEX?

For technical support, including PT7A7514WEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT7A7514WEX requirements.

6.How does Aetrix verify that PT7A7514WEX is sourced from the original manufacturer or authorized distributors?

All PT7A7514WEX 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 PT7A7514WEX meets industry standards.

7.What is the process for return or replacement of PT7A7514WEX?

All PT7A7514WEX units undergo pre-shipment inspection (PSI). If there is an issue with PT7A7514WEX, 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 PT7A7514WEX part is unused and in its original packaging.

Return procedure for PT7A7514WEX:

1.Submit a request within 90 days.

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

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