Diodes Incorporated PT7M7811STBEX

Overview

PT7M7811STBEX 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 operates down to VCC = 1.0V - enabling reliable reset control in low-voltage embedded microprocessor systems.

For engineers reviewing the PT7M7811STBEX datasheet, PT7M7811STBEX pinout, PT7M7811STBEX application, or PT7M7811STBEX equivalent, this device supports critical power-monitoring functions including supply-voltage supervision, watchdog timeout detection (1.6s typ), and manual system reset in space-constrained industrial and networking equipment where SOT143 packaging and guaranteed sub-1V reset validity are essential.

Technical Context

The PT7M7811STBEX integrates a precision voltage monitor with ±2.5% threshold accuracy over −40°C to +85°C, a 200ms internal reset timeout timer, and a 1.6s watchdog timer that clears on any WDI edge or reset assertion. Its MR input features an internal 10–40kΩ pull-up resistor and supports CMOS-compatible debounced triggering.

It delivers push-pull RESET output with VOL ≤ 0.3V at 100µA sink current and guaranteed logic-level validity down to VCC = 1.0V, while supporting operation across 1.0V–5.5V supply range and consuming only 10–30µA quiescent current - making it suitable for battery-backed and always-on monitoring applications.

Key Specifications

Pinout & Package

PT7M7811STBEX is housed in a 4-pin SOT143 (TB) package - compact, surface-mount, and optimized for high-density PCB layouts in industrial and telecom modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX811S293TSG-13 and TPS3808G33DBVR, PT7M7811STBEX uniquely combines 2.93V precision monitoring, push-pull RESET, debounced MR, and integrated watchdog in a single SOT143 package - delivering full supervisory capability without external components or design compromises.

Availability

PT7M7811STBEX is available at Aetrix Electronics and suitable for industrial PLC controllers, network router management units, embedded security gateways, and server baseboard management controllers requiring stable component supply and long-term production continuity.

Supply support for PT7M7811STBEX 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.

PT7M7811STBEX belongs to the PT7M78xx family of μP supervisors - designed specifically to reduce component count and improve power-supply reliability in microprocessor-based systems through integrated voltage monitoring, reset timing, and watchdog functionality.

FAQ

What is the minimum operating voltage for guaranteed RESET assertion?

PT7M7811STBEX guarantees RESET output validity down to VCC = 1.0V, meaning it will assert a logic-low RESET signal even when supply voltage drops to 1.0V - critical for fail-safe operation during deep brownout events before complete power loss.

Does PT7M7811STBEX require external components for manual reset functionality?

No. The MR input includes an internal 10–40kΩ pull-up resistor and hardware debouncing, allowing direct connection of a momentary switch between MR and GND - eliminating external resistors, capacitors, or Schmitt triggers required by most competing supervisors.

How does the watchdog timer respond to WDI signal transitions?

The watchdog timer clears on every rising or falling edge of the WDI input. If WDI remains static (high or low) for ≥1.6s (typical), the timer expires and triggers a reset pulse - enabling firmware to "kick" the watchdog by toggling a GPIO pin at regular intervals.

Is PT7M7811STBEX pin-compatible with other PT7M78xx variants in SOT143 package?

Yes - all PT7M78xx devices in TB (SOT143) package share identical 4-pin pinout (VCC, GND, MR, RESET), enabling drop-in replacement across threshold voltages and feature sets (e.g., PT7M7811STBEX ↔ PT7M7812STBEX), provided system-level WDI/MR usage matches.