Diodes Incorporated PT7M7824KTAEX

Overview

PT7M7824KTAEX from Diodes Incorporated is a precision microprocessor supervisory IC with 2.25V reset threshold, push-pull active-low RESET output, manual-reset input (MR), and watchdog timer (WDI) functionality. It asserts reset during power-up, brownout, or manual trigger, guarantees RESET validity down to VCC = 1.0V, and delivers a fixed 200ms reset pulse width - used in embedded systems requiring reliable power sequencing and fault recovery.

For engineers reviewing the PT7M7824KTAEX datasheet, PT7M7824KTAEX pinout, PT7M7824KTAEX application, or PT7M7824KTAEX equivalent, key selection criteria include its 2.25V threshold accuracy (±2.5% over –40°C to +85°C), debounced CMOS-compatible MR input, integrated watchdog timeout (~1.6s), push-pull RESET drive capability (3.2mA sink at VCC ≥ 4.5V), and SOT23-5 package compatibility.

Technical Context

The PT7M7824KTAEX implements a dual-path supervision architecture: one path monitors VCC against a precision 2.25V threshold with hysteresis (4mV typical), while the second path conditions the watchdog timer using WDI edge detection (150ns minimum pulse width). Reset assertion is synchronized across all triggers - power failure, MR activation, or watchdog timeout - and released only after VCC exceeds VRST and the internal 200ms timer expires.

Its MR input features an internal 35–75kΩ pull-up resistor and supports debounced manual reset; WDI is CMOS-compatible with automatic disable when floating. The push-pull RESET output ensures fast, low-impedance transitions without external pull-ups, enabling direct interface with µP reset inputs requiring ≤0.4V low-level guarantee at 3.2mA sink.

Key Specifications

Pinout & Package

SOT23-5 package (5-pin, 1.6mm × 2.9mm, 0.95mm height), RoHS-compliant, tape-and-reel delivery.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2T and TPS3808G125DBVR, PT7M7824KTAEX uniquely combines fixed 2.25V precision threshold, integrated watchdog, manual reset, and push-pull RESET in a single SOT23-5 package - eliminating external components and enabling compact, self-contained supervision for 2.5V domain systems.

Availability

PT7M7824KTAEX is available at Aetrix Electronics and suitable for industrial PLC controllers, network router power management, medical handheld diagnostics, and smart energy meters requiring stable component supply, long-term lifecycle support, and guaranteed reset reliability under brownout conditions.

Supply support for PT7M7824KTAEX 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 communications markets.

The PT7M78xx family was designed specifically for µP system supervision - integrating precision voltage monitoring, watchdog timing, and manual reset into compact packages to replace discrete reset circuits and reduce board space in embedded applications.

FAQ

What is the guaranteed minimum VCC level at which RESET remains valid?

PT7M7824KTAEX guarantees RESET/RESET output validity down to VCC = 1.0V. This ensures deterministic reset assertion during deep brownout events before power collapse, enabling controlled MCU shutdown sequences in battery-backed or unregulated supply environments.

Does the watchdog timer require external components to operate?

No. The watchdog timer operates autonomously using an internal timebase; it triggers reset if WDI remains static (high or low) for ~1.6s. WDI can be left floating to disable the watchdog, or driven by any µP GPIO capable of generating >150ns pulses - no capacitors, resistors, or external oscillators are needed.

Can the MR input be used without an external pull-up resistor?

Yes. PT7M7824KTAEX integrates a 35–75kΩ internal pull-up resistor on the MR pin. A momentary switch to ground is sufficient for manual reset; no external biasing components are required, simplifying PCB layout and reducing BOM count.

Is the RESET output compatible with 1.8V logic interfaces?

Yes. The push-pull RESET output drives low to ≤0.3V at 100µA sink current when VCC ≥ 1.0V, meeting 1.8V logic low-level requirements (≤0.45V). Its high-level output reaches ≥0.8×VCC, ensuring compatibility with 1.8V, 2.5V, and 3.3V µP reset inputs.