Diodes Incorporated PT7M7811MTBEX

Overview

PT7M7811MTBEX from Diodes Incorporated is a precision μP supervisor IC with 4.38V reset threshold, 200ms reset pulse width, push-pull RESET output, and integrated watchdog timer. It monitors VCC during power-up/down/brownout, asserts reset below threshold, and supports manual reset via debounced CMOS input - deployed in embedded systems requiring reliable power sequencing and fault recovery.

For engineers reviewing the PT7M7811MTBEX datasheet, PT7M7811MTBEX pinout, PT7M7811MTBEX application, or PT7M7811MTBEX equivalent, key selection criteria include its 4.38V threshold accuracy (±2.5% over –40°C to +85°C), guaranteed RESET validity down to VCC = 1.0V, MR internal pull-up (10–40 kΩ), and SOT143-4 package compatibility with space-constrained industrial control modules.

Technical Context

The PT7M7811MTBEX implements a dual-function supervisory architecture: a precision bandgap-based voltage monitor triggers reset when VCC falls below 4.38V (VRN), with hysteresis of 50 mV, and a 1.6s watchdog timer clears on WDI edge transitions or reset assertion. Its reset generator guarantees low-state duration ≥200ms after VCC recovery, MR release, or watchdog timeout.

It features a CMOS-compatible manual-reset input with internal pull-up (10–40 kΩ), push-pull RESET output capable of sinking 3.2mA at VCC ≥4.5V (VOL ≤0.4V), and operates across full industrial temperature range (–40°C to +85°C) with supply current as low as 10 µA at 5V.

Key Specifications

Pinout & Package

PT7M7811MTBEX is housed in a 4-pin SOT143 (TB) plastic surface-mount package, optimized for high-density PCB layouts and automated assembly. Pin assignments are validated per Diodes Document 43008 Rev 2-4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX811S24-13 and TPS3809K33DBVR, PT7M7811MTBEX uniquely integrates 4.38V precision monitoring, push-pull RESET, debounced MR, and watchdog in one SOT143 package - enabling full power-supply supervision without supplemental components.

Availability

PT7M7811MTBEX is available at Aetrix Electronics and suitable for industrial PLC controllers, network router power management, embedded security gateways, and server BMC power monitoring requiring stable component supply and long-term design-in support.

Supply support for PT7M7811MTBEX 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.

PT7M7811MTBEX belongs to the PT7M78xx μP supervisor family, designed specifically to reduce component count and improve power-supply reliability in microprocessor-based systems through integrated voltage monitoring, reset generation, and watchdog functionality.

FAQ

What is the exact reset threshold voltage and its tolerance for PT7M7811MTBEX?

The PT7M7811MTBEX has a nominal reset threshold of 4.38V, with a guaranteed tolerance of ±2.5% across the full operating temperature range (–40°C to +85°C). This value is specified in Diodes Document 43008 Rev 2-4, Section "DC Electrical Characteristics", under symbol VRST for part suffix 'M'.

Does PT7M7811MTBEX support manual reset, and how is it implemented?

Yes - PT7M7811MTBEX includes a debounced CMOS-compatible manual-reset (MR) input. It is active-low, features an internal pull-up resistor (10–40 kΩ), and holds RESET asserted for the full 200ms timeout after MR transitions from low to high. No external components are needed for basic push-button implementation.

Is the RESET output push-pull or open-drain, and what are its drive capabilities?

PT7M7811MTBEX provides a push-pull RESET output. At VCC ≥4.5V, it can sink up to 3.2mA while maintaining VOL ≤0.4V, and source current is sufficient to drive standard CMOS inputs directly. This eliminates the need for an external pull-up resistor used with open-drain variants like PT7M7803.

Can PT7M7811MTBEX operate reliably during deep brownout conditions?

Yes - PT7M7811MTBEX guarantees valid RESET/RESET output down to VCC = 1.0V, as confirmed in the "DC Electrical Characteristics" table. Its internal circuitry remains functional and asserts reset correctly even as supply voltage collapses, ensuring deterministic microprocessor reset behavior under severe undervoltage.