Diodes Incorporated PT7M7811TTBEX

Overview

PT7M7811TTBEX from Diodes Incorporated is a precision μP supervisor IC with 2.93V reset threshold, push-pull RESET output, debounced manual-reset input (MR), and watchdog timer input (WDI). It asserts a guaranteed 200ms active-low reset pulse during power-up, brownout, or manual trigger, and remains functional down to VCC = 1.0V. Designed for embedded microprocessor systems requiring reliable power monitoring and system recovery, it supports critical functions in server power management and industrial controllers.

For engineers reviewing the PT7M7811TTBEX datasheet, PT7M7811TTBEX pinout, PT7M7811TTBEX application, or PT7M7811TTBEX equivalent, key selection criteria include its 2.93V threshold accuracy (±2.5% over -40°C to +85°C), MR internal pull-up (10–40 kΩ), 1.6s watchdog timeout, and SOT143-4 package compatibility with space-constrained PCB layouts.

Technical Context

The PT7M7811TTBEX integrates a precision voltage monitor, reset generator with 200ms timeout, and a watchdog timer that triggers reset if WDI remains static beyond 1.6s. Its MR input features CMOS-compatible debouncing and an internal pull-up resistor, eliminating external components for push-button reset implementation.

It delivers push-pull RESET output with guaranteed logic low ≤0.4V at VCC ≥4.5V and Isink=3.2mA, and maintains valid RESET assertion down to VCC = 1.0V - enabling robust reset behavior during deep brownout conditions common in battery-backed or low-voltage embedded systems.

Key Specifications

Pinout & Package

PT7M7811TTBEX is housed in a 4-pin SOT143 (TB) plastic surface-mount package, optimized for thermal performance and board-level reliability in high-density applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX811T24-18SA-7 and TPS3808G18DBVR, PT7M7811TTBEX uniquely combines 2.93V precision threshold, integrated watchdog timer, debounced MR, and push-pull output in a 4-pin SOT143 - making it optimal for 3.3V embedded systems needing full-featured supervision without design compromises.

Availability

PT7M7811TTBEX is available at Aetrix Electronics and suitable for industrial PLC controllers, network router power management, and embedded security gateways requiring stable component supply and long-term production continuity.

Supply support for PT7M7811TTBEX 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.

PT7M7811TTBEX belongs to the PT7M78xx family of μP supervisors designed specifically to replace discrete reset circuits in microprocessor-based systems - delivering integrated voltage monitoring, watchdog, and manual reset in a single, AEC-Q100-capable package.

FAQ

What is the guaranteed minimum VCC level at which PT7M7811TTBEX asserts RESET?

PT7M7811TTBEX guarantees valid RESET assertion down to VCC = 1.0V, with output low voltage ≤0.4V at VCC ≥4.5V and Isink = 3.2mA. This ensures reliable reset hold during deep brownout conditions before system power collapse, critical for preserving register states and preventing undefined behavior in microcontrollers.

Does PT7M7811TTBEX require external components for manual reset functionality?

No - PT7M7811TTBEX includes an internal MR pull-up resistor (10–40 kΩ) and hardware debouncing, allowing direct connection of a momentary switch between MR and GND without external resistors or RC filters. This reduces BOM count and PCB footprint while ensuring noise-immune reset initiation.

How does the watchdog timer respond to WDI signal transitions?

The watchdog timer clears on any rising or falling edge at the WDI pin and begins counting only after RESET is released. Pulses as short as 150ns are detectable, enabling efficient firmware "kick" routines without dedicated timing overhead. Leaving WDI floating disables the watchdog function entirely.

Is PT7M7811TTBEX compatible with 3.3V microprocessor reset inputs?

Yes - with a nominal 2.93V reset threshold and ±2.5% tolerance over -40°C to +85°C, PT7M7811TTBEX reliably monitors standard 3.3V rails and asserts RESET before the microprocessor's minimum operating voltage is violated. Its push-pull output drives directly into typical CMOS reset inputs without level-shifting.