Diodes Incorporated PT7M7824STAEX

Overview

PT7M7824STAEX from Diodes Incorporated is a precision microprocessor (μP) supervisory circuit with push-pull RESET output, manual-reset input (MR), and watchdog timer (WDI) functionality. It features a 2.93V reset threshold (S-grade), 200ms reset pulse width, guaranteed RESET validity down to VCC = 1.0V, and operates across –40°C to +85°C. Used in embedded systems requiring reliable power-on reset and brownout protection during firmware initialization.

For engineers reviewing the PT7M7824STAEX datasheet, PT7M7824STAEX pinout, PT7M7824STAEX application, or PT7M7824STAEX equivalent, key selection criteria include reset threshold accuracy (±2.5% over temperature), MR debounce capability, watchdog timeout (1.6s typ), push-pull drive strength (3.2mA sink), and SOT23-5 package compatibility with space-constrained μP power rails.

Technical Context

The PT7M7824STAEX integrates three core supervision functions: precise voltage monitoring with hysteresis (4mV typ for S-grade), a 1.6s watchdog timer that clears on WDI edge transitions or RESET assertion, and a debounced CMOS-compatible manual-reset input with internal 52kΩ pull-up resistor. Its push-pull RESET output ensures fast, low-impedance active-low signaling without external pull-ups.

It operates across a 1.0V–5.5V supply range and guarantees functional reset behavior down to VCC = 1.0V - critical for low-voltage microcontrollers and battery-backed systems. The device uses an internal timebase for both reset timeout (200ms) and watchdog timing, eliminating external components while maintaining ±20% timing tolerance.

Key Specifications

Pinout & Package

PT7M7824STAEX is housed in a 5-pin SOT23-5 (TA) plastic package, surface-mountable with standard reflow profiles and footprint compatibility with industry-standard 5-pin supervisory IC layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX823-29SA-7 and TPS3808G33DBVR, PT7M7824STAEX uniquely combines 2.93V precision threshold, push-pull RESET, integrated WDI, and debounced MR in a single SOT23-5 package - making it optimal for compact, feature-complete supervision in 3.3V embedded systems.

Availability

PT7M7824STAEX is available at Aetrix Electronics and suitable for industrial PLC controllers, network infrastructure equipment, medical infusion pumps, and automotive body control modules requiring stable component supply and long-term design-in support.

Supply support for PT7M7824STAEX 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, computing, and automotive markets.

The PT7M78xx family targets μP system reliability enhancement - delivering integrated voltage monitoring, reset generation, watchdog, and manual reset in minimal footprint to reduce BOM count and improve power-rail robustness.

FAQ

Does PT7M7824STAEX support watchdog disable without external components?

Yes. The watchdog function is automatically disabled when the WDI pin is left unconnected or driven by a high-impedance (three-state) buffer. No pull-up or pull-down resistors are required - the internal circuitry detects floating WDI and inhibits timeout counting.

What is the minimum VCC required for guaranteed RESET assertion?

PT7M7824STAEX guarantees RESET output remains valid (logic low ≤0.4V) down to VCC = 1.0V. This ensures deterministic reset behavior during deep brownout or battery discharge scenarios where other supervisors may release prematurely.

Can the MR input be used with a normally-open pushbutton without external components?

Yes. The MR pin has an internal 52kΩ pull-up resistor to VCC. Connecting a momentary switch between MR and GND provides fully functional manual reset - no external resistor or debounce capacitor is needed for typical PCB-mounted tactile switches.

Is PT7M7824STAEX qualified for automotive applications?

No. While manufactured in IATF 16949-certified facilities, PT7M7824STAEX is not AEC-Q100 qualified. For automotive use, Diodes recommends contacting their sales team for PPAP-capable alternatives such as the APX803S series with AEC-Q100 Grade 2 qualification.