Diodes Incorporated PT7M7812RTBEX

Overview

PT7M7812RTBEX from Diodes Incorporated is a precision microprocessor supervisory circuit with manual-reset and watchdog functionality, 4.63V reset threshold (L-grade), 200ms reset pulse width, and SOT143-4 package. It asserts active-low RESET during power-up, brownout, or manual reset, and monitors WDI for system-level fault detection in embedded microcontroller systems.

For engineers reviewing the PT7M7812RTBEX datasheet, PT7M7812RTBEX pinout, PT7M7812RTBEX application, or PT7M7812RTBEX equivalent, key selection criteria include its guaranteed RESET validity down to VCC = 1.0V, debounced CMOS-compatible MR input, dual-function watchdog timing (1.6s timeout), and compatibility with industrial temperature range (–40°C to +85°C) and automotive-qualified supply monitoring.

Technical Context

The PT7M7812RTBEX implements a dual-trigger reset generator: one path responds to VCC falling below 4.63V ±2.5% (brownout), the other activates on MR low-to-high transition or WDI timeout. Its internal timebase ensures deterministic 200ms reset assertion after any trigger event.

It integrates a 1.6s watchdog timer that clears on every WDI edge or RESET assertion; floating WDI disables watchdog. The MR pin features an internal 10–40kΩ pull-up resistor and supports debounced push-button reset with 200ns minimum pulse width tolerance.

Key Specifications

Pinout & Package

PT7M7812RTBEX is housed in a 4-pin SOT143 (TB) plastic surface-mount package with gull-wing leads, optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX811S24-12TSA-7 and MAX6326UR29D3+, PT7M7812RTBEX uniquely delivers integrated manual reset and watchdog in a single SOT143 package - enabling full system supervision without adding discrete logic or increasing footprint.

Availability

PT7M7812RTBEX is available at Aetrix Electronics and suitable for industrial PLC controllers, network router power management, security system DVR boards, and embedded medical data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for PT7M7812RTBEX 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 semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity applications.

The PT7M78xx family targets high-reliability µP supervision in industrial, networking, and embedded systems - designed to replace discrete reset circuits with integrated voltage monitoring, manual reset, and watchdog functions in minimal footprint.

FAQ

What is the reset threshold voltage for PT7M7812RTBEX?

The PT7M7812RTBEX has a nominal reset threshold of 4.63V, specified with ±2.5% tolerance over the full operating temperature range (–40°C to +85°C). This value is confirmed in the "Function Comparison Table" and "DC Electrical Characteristics" sections of the official Diodes datasheet (Document Number 43008 Rev 2-4), where it corresponds to the "L" suffix in the part numbering scheme.

Does PT7M7812RTBEX support watchdog functionality?

Yes, PT7M7812RTBEX includes a watchdog timer with a typical timeout period of 1.6 seconds. The WDI input is edge-sensitive - toggling WDI clears the timer, while a sustained high or low state for >1.6s triggers reset. Watchdog operation is explicitly enabled in the Function Comparison Table (row 5) and detailed in the "Functional Description" section of the datasheet.

What package type does PT7M7812RTBEX use?

PT7M7812RTBEX uses the SOT143 (TB) package - a 4-pin, surface-mount plastic package with gull-wing leads. This is confirmed in the "Ordering Information" table, where "TB" is listed as the package code for PT7M7812XTBEX, and in the "Mechanical Information" section (page 12) of the datasheet, which provides dimensional drawings for TB.

Is PT7M7812RTBEX still in active production?

No - according to the "Ordering Information" table in the datasheet, PT7M7812XTBEX is marked "End of life". Diodes recommends migrating to APX803S/APX809S/APX811/APX823 series as functional replacements, as noted in the document's obsolescence notice on page 1. Aetrix Electronics maintains limited legacy stock for design continuity but advises new designs to adopt the recommended alternatives.