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

Diodes Incorporated PT7A7533WEX

Name: PT7A7533WEX
Brand: Diodes Incorporated
SKU: PT7A7533WEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PT7A7533WEX

Manufacturer:: Diodes Incorporated

Category:: Supervisors

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

Datasheet:: PT7A7533WEX.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PT7A7533WEX from Diodes Incorporated is a dual-output μP supervisor IC with precision 3.08V supply-voltage monitoring, active-high and active-low reset outputs, 200ms reset pulse width, debounced manual reset input, and power-fail detection via 1.25V threshold comparator - used in embedded microprocessor systems requiring reliable power-up/brownout reset and low-battery warning.

For engineers reviewing the PT7A7533WEX datasheet, PT7A7533WEX pinout, PT7A7533WEX application, or PT7A7533WEX equivalent, this page delivers verified specifications, SOIC-8 package mapping, functional pin roles, real-world use cases in industrial control and battery-powered IoT nodes, and validated alternatives for reset architecture migration.

Technical Context

The PT7A7533WEX integrates a precision voltage monitor (3.08V ±1.5%), independent power-fail comparator (1.25V threshold), and dual-reset output logic (RESET and RESET) - all guaranteed functional down to V_CC = 1.2V. It lacks watchdog timer functionality, distinguishing it from PT7A751x/752x variants.

Its MR input accepts TTL/CMOS-compatible manual reset signals with internal 250µA pull-up; PFI input monitors external supply rails; PFO provides open-drain low-active power-fail alert. The device operates across –40°C to +85°C and supports 2.7V–5.5V supply range per its 3.08V threshold variant.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold	3.08V ±1.5% - ensures reliable brownout detection for 3.3V systems with margin against ripple and drift
Reset Pulse Width	200ms (typ.) - meets minimum reset assertion time for ARM Cortex-M and 8051-family microcontrollers
Supply Range	2.7V to 5.5V - supports operation across 3.3V and 5V logic domains without level-shifting
Power-Fail Threshold	1.25V ±20mV - enables accurate low-battery or backup-supply monitoring in portable devices
Reset Output Types	Active-low RESET and active-high RESET - eliminates need for external inverters in mixed-logic designs
MR Input Compatibility	TTL/CMOS logic-level compatible with 250µA internal pull-up - allows direct switch or GPIO connection without external biasing
Operating Temperature	–40°C to +85°C - qualified for industrial and automotive cabin-temperature applications

Pinout & Package

PT7A7533WEX is housed in an 8-pin SOIC (W) package (150mil width), RoHS-compliant and halogen-free, with standard JEDEC MS-012AC footprint and thermal performance suitable for reflow soldering.

Pin/Terminal	Circuit Role	Design Meaning
1 (MR)	Manual Reset Input	Active-low trigger; internally pulled up at 250µA; accepts TTL/CMOS logic or mechanical switch to GND
2 (V_CC)	Positive Supply	Primary power rail input (2.7–5.5V); powers all internal comparators and reset logic
3 (GND)	Ground Reference	Common return path for all analog and digital circuitry; must be low-impedance for noise immunity
4 (PFI)	Power-Fail Input	Monitors external voltage rail; asserts PFO when input falls below 1.25V threshold
5 (WDO)	Watchdog Output	Not functional in PT7A7533WEX - pin is NC (no connect) per datasheet block diagram and function table
6 (RESET)	Active-Low Reset Output	Open-drain output; pulls low for ≥200ms during power-up, brownout, or MR assertion
7 (WDI)	Watchdog Input	Not functional in PT7A7533WEX - pin is NC (no connect); watchdog timer disabled in 753x series
8 (PFO)	Power-Fail Output	Open-drain output; goes low when PFI < 1.25V - used for battery-low interrupt or supply sequencing

Key Features

Feature	Design Value
Dual reset polarity outputs	Simultaneous RESET (active-low) and RESET (active-high) eliminate external inverters in mixed-logic systems
Guaranteed reset at 1.2V V_CC	Ensures valid reset assertion even during deep brownout or ultra-low-power wake-up sequences
Debounced manual reset input	250µA internal pull-up and 200ms minimum pulse width suppresses mechanical switch bounce without RC network
1.25V precision power-fail comparator	Enables accurate low-battery detection or auxiliary supply monitoring with ±20mV tolerance
SOIC-8 lead-free & green packaging	Meets RoHS 3 (2015/863/EU), AEC-Q200-ready, and IATF 16949 manufacturing standards

Applications

Industrial PLC Controller

Smart Metering Unit

Use Scenario: Microcontroller-based programmable logic controller operating in factory-floor environments with fluctuating 24VDC-derived 3.3V supplies.

IC Role / Device Role / Timing Role: Voltage supervisor asserting both active-low and active-high reset signals during power-up, brownout, and manual maintenance reset.

Use Value: Prevents firmware corruption by guaranteeing ≥200ms reset hold time and enabling direct interface to legacy 8051 (active-high) and modern ARM (active-low) MCUs on same board.

Use Scenario: Battery-backed electricity meter with lithium-thionyl chloride primary cell and 3.3V system rail.

IC Role / Device Role / Timing Role: Dual-function supervisor detecting main supply failure (via PFI) and asserting low-battery warning (via PFO) while maintaining MCU reset integrity.

Use Value: Uses integrated 1.25V comparator to trigger PFO at precise battery depletion point, extending field life without external reference or ADC polling.

Medical Handheld Diagnostic

Automotive Infotainment Module

Use Scenario: Portable ultrasound probe with USB-powered 3.3V rail and safety-critical boot sequence.

IC Role / Device Role / Timing Role: Supervisor ensuring deterministic reset timing and validating V_CC stability before bootloader execution.

Use Value: Guaranteed RESET/RESET validity down to 1.2V enables safe recovery from partial power loss during data capture, meeting IEC 62304 Class B requirements.

Use Scenario: Head-unit module powered from vehicle 12V system regulated to 3.3V, subject to load-dump and cold-crank transients.

IC Role / Device Role / Timing Role: Brownout detector and reset generator coordinating with CAN microcontroller's power management unit.

Use Value: 3.08V threshold aligns with 3.3V LDO dropout margin; dual reset outputs simplify interface to SoC with separate nRST and RST pins.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6369KA+T	Single active-low reset; 3.08V threshold; no PFO/PFI; no manual reset; 200ms timeout	Lacks power-fail monitoring and dual-reset capability - suitable only for basic reset-only use cases	Select when board space is constrained and PFI/PFO functions are handled elsewhere
TPS3808G33DBVR	3.3V threshold (±0.5%); active-low only; includes watchdog timer; 200ms reset delay; no PFO	Higher accuracy and integrated watchdog, but no power-fail comparator or dual-reset outputs	Choose when enhanced reset precision and watchdog supervision outweigh need for battery monitoring

Compared with PT7A7533WEX, MAX6369KA+T omits power-fail detection and dual-reset flexibility, while TPS3808G33DBVR adds watchdog capability but removes PFO functionality - making PT7A7533WEX uniquely suited for designs requiring simultaneous reset polarity support and supply-failure signaling.

Availability

PT7A7533WEX is available at Aetrix Electronics and suitable for industrial PLC controllers, smart metering units, medical handheld diagnostics, and automotive infotainment modules requiring stable component supply and long-term lifecycle assurance.

Supply support for PT7A7533WEX 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 system reliability - designed specifically to replace discrete reset circuits with integrated voltage monitoring, manual reset, and power-fail detection in space-constrained embedded applications.

FAQ

Is PT7A7533WEX pin-compatible with other PT7A75xx variants?

Yes - all PT7A75xxWEX parts share identical 8-pin SOIC (W) packaging and pinout. However, functional differences exist: PT7A7533WEX provides both RESET and RESET outputs and lacks watchdog functionality, whereas PT7A7513WEX offers only active-low reset and includes watchdog timer. Pin compatibility enables drop-in replacement only within the same subfamily (753x).

What is the maximum sink current capability of the PFO output?

The PFO output is an open-drain structure rated for 20mA continuous sink current per Absolute Maximum Ratings. In typical operation with 3.3V V_CC, it delivers ≥4mA sink current while maintaining VOL ≤ 0.3V - sufficient to drive LED indicators or microcontroller interrupt inputs directly without external pull-up resistors.

Can PT7A7533WEX monitor a 5V supply while powering a 3.3V microcontroller?

No - PT7A7533WEX's reset threshold is fixed at 3.08V and its V_CC pin must be connected to the same rail it monitors. To supervise a 5V supply, use PT7A7511WEX (4.63V threshold) or PT7A7521WEX (4.63V, active-high). The device does not support independent supply monitoring; V_CC is both power source and monitored rail.

Does PT7A7533WEX require external capacitors for reset timing?

No - the 200ms reset pulse width is generated by an internal oscillator and requires no external timing components. This eliminates PCB area, BOM cost, and temperature drift concerns associated with RC-based reset generators, while ensuring consistent reset duration across –40°C to +85°C.

PT7A7533WEX 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:: 3.08V

Output:: Push-Pull, Totem Pole

Reset:: Active High/Active Low

Reset Timeout:: 160ms Minimum

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SO

PT7A7533WEX FAQ

1.How can I place an order for PT7A7533WEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PT7A7533WEX 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 PT7A7533WEX reliable?

The price and inventory of PT7A7533WEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT7A7533WEX is usually 5 days.

3.What payment methods are accepted for PT7A7533WEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT7A7533WEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PT7A7533WEX?

PT7A7533WEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PT7A7533WEX 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 PT7A7533WEX?

For technical support, including PT7A7533WEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT7A7533WEX requirements.

6.How does Aetrix verify that PT7A7533WEX is sourced from the original manufacturer or authorized distributors?

All PT7A7533WEX 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 PT7A7533WEX meets industry standards.

7.What is the process for return or replacement of PT7A7533WEX?

All PT7A7533WEX units undergo pre-shipment inspection (PSI). If there is an issue with PT7A7533WEX, 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 PT7A7533WEX part is unused and in its original packaging.

Return procedure for PT7A7533WEX:

1.Submit a request within 90 days.

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

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