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

Diodes Incorporated PT7A7535WE

Name: PT7A7535WE
Brand: Diodes Incorporated
SKU: PT7A7535WE
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PT7A7535WE

Manufacturer:: Diodes Incorporated

Category:: Supervisors

Package:: -

Datasheet:: PT7A7535WE.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PT7A7535WE from Diodes Incorporated is a dual-polarity μP supervisor IC with 2.63V reset threshold, active-high and active-low RESET outputs, 200ms reset pulse width, 1.25V power-fail detection, and manual reset input - used in embedded microprocessor systems requiring reliable power-up/down/brownout reset assertion and low-battery warning.

For engineers reviewing the PT7A7535WE datasheet, PT7A7535WE pinout, PT7A7535WE application, or PT7A7535WE equivalent, key selection criteria include dual-reset polarity support, guaranteed RESET/RESET validity down to V_CC = 1.2 V, absence of watchdog timer (unlike PT7A751x/752x), 8-pin SOIC-W package compatibility, and 1.25V PFI threshold for battery monitoring.

Technical Context

The PT7A7535WE implements a precision voltage monitor with ±1.5% reset threshold tolerance at 2.63V nominal, and guarantees valid reset assertion even as V_CC drops to 1.2 V. Its dual-output architecture provides both RESET (active-low) and RESET (active-high), enabling direct interface with microprocessors requiring either polarity - such as legacy 80C51-family MCUs.

It integrates a dedicated 1.25V reference-based power-fail comparator (PFI/PFO), where PFI accepts external voltage monitoring and triggers PFO low when input falls below 1.25V ±20mV. The MR input features internal 250µA pull-up and TTL/CMOS compatibility, supporting push-button or logic-driven reset initiation without external components.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold	2.63V ±1.5% - ensures reliable brownout detection for 3.0V/3.3V systems operating near minimum supply margin.
Reset Pulse Width	200ms typ. - meets minimum reset hold time requirements for most 8-bit and 16-bit microcontrollers.
PFI Threshold	1.25V ±20mV - enables accurate low-battery or power-fail warning using external resistor divider.
V_CC Operating Range	2.7V to 5.5V - supports operation across 3.0V, 3.3V, and 5.0V logic domains without level-shifting.
Supply Current	30µA typ. at 3.0V - minimizes quiescent power impact in battery-backed or energy-sensitive applications.
MR Input Drive	250µA internal pull-up - allows direct switch-to-ground connection without external resistor.
Output Drive Strength	3.2mA sink (RESET), 800µA source (RESET) - sufficient to drive MCU reset pins and small logic loads directly.

Pinout & Package

PT7A7535WE is housed in an 8-pin SOIC-W (150mil wide) package, RoHS-compliant and halogen-free, with standard surface-mount footprint compatible with automated assembly.

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 (2.7–5.5V); powers all internal comparators, timers, and output drivers.
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	Analog input referenced to 1.25V internal bandgap; monitors external voltage (e.g., battery) via resistor divider.
5 (RESET)	Active-Low Reset Output	Open-drain capable; asserts low during power-up, brownout, or MR activation; holds for ≥200ms.
6 (RESET)	Active-High Reset Output	Complementary to RESET; guaranteed valid down to V_CC = 1.2V; interfaces directly with Intel 80C51-style MCUs.
7 (NC)	No Connect	Internally unconnected pin; must remain floating or tied to GND per layout best practices.
8 (PFO)	Power-Fail Output	Active-low open-drain output; goes low when PFI < 1.25V; used for battery-low interrupt or system shutdown signaling.

Key Features

Feature	Design Value
Dual-polarity reset outputs	Simultaneous RESET (active-low) and RESET (active-high) eliminate need for external inverters in mixed-logic designs.
Guaranteed reset at low V_CC	Valid RESET/RESET assertion down to V_CC = 1.2V ensures robust behavior during deep brownout or battery depletion.
Integrated 1.25V power-fail comparator	Enables precise low-battery detection using only two external resistors - no external reference required.
Debounced manual reset input	250µA internal pull-up + 200ms minimum pulse width suppresses switch bounce without RC network.
Lead-free & green compliance	Fully RoHS 3 (2015/863/EU), halogen-free (<900ppm Br/Cl, <1000ppm Sb), and manufactured in IATF 16949 facilities.

Applications

Industrial PLC Controller

Medical Portable Monitor

Use Scenario: Microcontroller-based programmable logic controller operating from 3.0V regulated supply with backup coin cell.

IC Role / Device Role / Timing Role: Supervisor IC asserting reset on brownout and providing low-battery warning via PFO before main supply collapse.

Use Value: Prevents firmware corruption during unstable line conditions and enables graceful shutdown when battery voltage drops below 2.8V.

Use Scenario: Battery-powered vital signs monitor with real-time data logging and LCD display.

IC Role / Device Role / Timing Role: Dual-reset polarity interface to ARM Cortex-M0 MCU and display controller; PFI monitors Li-ion cell voltage.

Use Value: Ensures deterministic boot sequence regardless of MCU reset polarity requirement and alerts user 30 seconds before battery exhaustion.

Automotive Body Control Module

Smart Energy Meter

Use Scenario: 12V-to-3.3V converted ECU managing door locks, lighting, and sensors in passenger vehicle.

IC Role / Device Role / Timing Role: Power supervisor detecting battery voltage sag during cold cranking and triggering safe state entry.

Use Value: Maintains MCU reset assertion during cranking transients (down to 6V battery), preventing erratic actuator behavior.

Use Scenario: DIN-rail mounted electricity meter with tamper detection, RTC backup, and RS-485 communication.

IC Role / Device Role / Timing Role: System supervisor monitoring main 5V rail and supercapacitor backup; PFO signals backup switchover.

Use Value: Guarantees uninterrupted RTC and memory retention during AC mains failure by initiating seamless backup power transition.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6326UT26D3+	Single active-low reset; 2.63V threshold; 200ms timeout; no dual-output or PFO.	Lacks active-high RESET and PFI/PFO functionality - requires external circuitry for same feature set.	Select when only basic reset supervision is needed and board space is constrained.
TPS3808G33DBVR	2.63V threshold; active-low reset; 200ms delay; includes watchdog; no PFO or dual-output.	Includes watchdog timer (absent in PT7A7535WE) but omits power-fail comparator and active-high reset.	Prefer when watchdog supervision is mandatory and PFI monitoring is handled separately.

Compared with MAX6326UT26D3+ and TPS3808G33DBVR, PT7A7535WE uniquely delivers dual-reset polarity and integrated 1.25V power-fail detection in one 8-pin SOIC - reducing BOM count and PCB area versus multi-component alternatives.

Availability

PT7A7535WE is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply and long-term lifecycle support.

Supply support for PT7A7535WE 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.

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

Does PT7A7535WE include a watchdog timer?

No. Unlike PT7A751x and PT7A752x variants, PT7A7535WE explicitly omits the watchdog timer function - confirmed in the Function Comparison Table (page 10) and Block Diagram (page 3). This simplifies timing-critical designs where watchdog interference must be avoided, and reduces current consumption by eliminating the 1.6-second timeout circuitry.

Can PT7A7535WE monitor a 3.7V Li-ion battery directly?

No - the PFI input has a fixed 1.25V threshold and cannot tolerate voltages above V_CC. To monitor a 3.7V battery, use a resistor divider (e.g., 2.2MΩ + 1.0MΩ) to scale battery voltage to ≤1.25V at PFI while maintaining input bias current error within ±2µA. Divider ratio must account for PFI input current (±2µA max).

What is the purpose of the NC pin (Pin 7)?

Pin 7 is a no-connect terminal - internally unconnected and electrically isolated. It must not be bonded or routed to any net. Per Diodes' packaging documentation, it may be left floating or tied to GND for mechanical stability; however, no current path or signal coupling exists, and it serves no functional role in reset supervision.

Is PT7A7535WE qualified for automotive use?

PT7A7535WE itself is not AEC-Q100 qualified; however, Diodes states that automotive-grade versions (with PPAP capability and IATF 16949 manufacturing) are available upon request. Customers requiring automotive qualification must contact Diodes or their authorized representative to obtain the specific qualified variant - standard PT7A7535WE is rated for industrial temperature range (−40°C to +85°C) only.

PT7A7535WE Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: -

Packaging:: Tube

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 High/Active Low

Reset Timeout:: 160ms Minimum

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

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

PT7A7535WE FAQ

1.How can I place an order for PT7A7535WE through Aetrix?

Please submit a Request for Quotation (RFQ) for PT7A7535WE 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 PT7A7535WE reliable?

The price and inventory of PT7A7535WE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT7A7535WE is usually 5 days.

3.What payment methods are accepted for PT7A7535WE?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT7A7535WE transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PT7A7535WE?

PT7A7535WE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PT7A7535WE 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 PT7A7535WE?

For technical support, including PT7A7535WE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT7A7535WE requirements.

6.How does Aetrix verify that PT7A7535WE is sourced from the original manufacturer or authorized distributors?

All PT7A7535WE 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 PT7A7535WE meets industry standards.

7.What is the process for return or replacement of PT7A7535WE?

All PT7A7535WE units undergo pre-shipment inspection (PSI). If there is an issue with PT7A7535WE, 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 PT7A7535WE part is unused and in its original packaging.

Return procedure for PT7A7535WE:

1.Submit a request within 90 days.

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

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