Diodes Incorporated PT7M7823LTAEX

Overview

PT7M7823LTAEX from Diodes Incorporated is a precision μP supervisor IC with 4.63V reset threshold, push-pull RESET output, manual-reset input (MR), and watchdog timer (WDI) - designed for reliable power-up/brownout reset assertion and system-level fault recovery in embedded microprocessor systems. It guarantees valid RESET/RESET down to VCC = 1.0V, delivers 200ms reset pulse width, and supports automotive-grade operation from −40°C to +85°C.

For engineers reviewing the PT7M7823LTAEX datasheet, PT7M7823LTAEX pinout, PT7M7823LTAEX application, or PT7M7823LTAEX equivalent, key selection criteria include its 4.63V precision voltage monitor, integrated watchdog timeout (1.6s typ), debounced MR input, push-pull RESET drive capability, and SOT23-5 package compatibility with space-constrained industrial control and networking hardware.

Technical Context

The PT7M7823LTAEX implements a dual-function supervisory architecture: a precision bandgap-based voltage monitor triggers reset when VCC falls below 4.63V (±2.5% over temperature), and a monostable watchdog timer resets the system if WDI remains static for >1.6s. Its internal timebase ensures deterministic 200ms reset pulse width after any reset event - power-up, brownout, MR activation, or watchdog timeout.

It features CMOS-compatible inputs (MR, WDI) with internal pull-up resistors (52kΩ typ), guaranteed RESET/RESET validity at VCC ≥ 1.0V, and push-pull output capable of sinking 3.2mA at VCC ≥ 4.5V. The device operates across 1.0V–5.5V supply range and maintains full functionality over −40°C to +85°C ambient.

Key Specifications

Pinout & Package

PT7M7823LTAEX is housed in a 5-pin SOT23-5 (TA) plastic package with gull-wing leads, optimized for automated placement and reflow soldering in high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX823-46SA-7 and MAX6326-L46T, PT7M7823LTAEX uniquely integrates both manual reset and watchdog functions in a single SOT23-5 package while maintaining lower quiescent current (13µA typ) and full 1.0V operation - making it optimal for compact, feature-rich embedded supervisors where firmware reliability and user-initiated recovery are essential.

Availability

PT7M7823LTAEX is available at Aetrix Electronics and suitable for industrial PLC controllers, network switch management units, and server baseboard management requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for PT7M7823LTAEX 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 targets microprocessor system reliability - delivering integrated voltage monitoring, reset generation, manual reset, and watchdog functions in ultra-small packages for space-constrained embedded applications.

FAQ

What is the minimum VCC voltage at which PT7M7823LTAEX guarantees valid RESET output?

The PT7M7823LTAEX guarantees RESET and RESET outputs remain valid down to VCC = 1.0V, with VOL ≤ 0.4V at Isink = 3.2mA (VCC ≥ 4.5V) and VOH ≥ 0.8×VCC at Isource = 120µA. This ensures robust reset signaling even during severe brownout conditions before system shutdown.

Does PT7M7823LTAEX require external components for basic reset functionality?

No external components are required for core reset operation: the MR input includes a 52kΩ internal pull-up resistor, the RESET output is push-pull (no external pull-up needed), and the watchdog is disabled by leaving WDI floating. Only decoupling capacitance on VCC is recommended per standard analog IC practice.

How does the watchdog timer respond to WDI signal transitions?

The PT7M7823LTAEX watchdog timer clears on every rising or falling edge of WDI and begins counting only after RESET is released. WDI pulses as short as 150ns are detected. If no edge occurs within 1.6s (typ), the timer triggers a reset - enabling precise firmware activity monitoring without software overhead.

Is PT7M7823LTAEX qualified for automotive applications?

PT7M7823LTAEX is not AEC-Q100 qualified. Diodes Incorporated states that automotive-grade versions require specific change control, PPAP capability, and IATF 16949 manufacturing - customers needing automotive qualification must contact Diodes directly for designated AEC-compliant alternatives such as the APX803S series.