Diodes Incorporated PT7M7823RTAEX

Overview

PT7M7823RTAEX from Diodes Incorporated is a precision microprocessor (μP) supervisory IC with 2.63V reset threshold, push-pull RESET output, manual-reset input (MR), and watchdog timer (WDI). It asserts a guaranteed 200ms active-low reset pulse during power-up, brownout, or manual trigger, and operates down to VCC = 1.0V. Used in embedded systems requiring reliable power monitoring and system recovery.

For engineers reviewing the PT7M7823RTAEX datasheet, PT7M7823RTAEX pinout, PT7M7823RTAEX application, or PT7M7823RTAEX equivalent, this page delivers verified electrical parameters, functional block context, SOT23-5 package details, real-world use cases, and validated alternative options for μP reset and watchdog design.

Technical Context

The PT7M7823RTAEX integrates a precision voltage monitor with ±2.5% threshold accuracy over –40°C to +85°C, a 200ms reset timeout generator, and a 1.6s watchdog timer that resets on WDI inactivity. Its MR input features an internal 52kΩ pull-up resistor and debounced CMOS compatibility.

It provides dual reset outputs: active-low push-pull RESET and its active-high inverse RESET, both guaranteed functional at VCC ≥ 1.0V. The device supports brownout detection, power-fail warning, and manual system recovery without external components.

Key Specifications

Pinout & Package

PT7M7823RTAEX is housed in a 5-pin SOT23-5 (TA) plastic package, surface-mountable with standard reflow profiles and RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT7M7823RTAEX, APX823T24-18SA-7 offers lower threshold but omits watchdog capability and uses open-drain output, while MAX809SEUR+T reduces pin count and features at the expense of design flexibility and system-level fault coverage.

Availability

PT7M7823RTAEX is available at Aetrix Electronics and suitable for industrial PLC controllers, network router management units, server BMC modules, and smart surveillance DVR systems requiring stable component supply and long-term design continuity.

Supply support for PT7M7823RTAEX 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 integrated circuits, specializing in high-performance analog, logic, and power management solutions for industrial, computing, and communications markets.

PT7M7823RTAEX belongs to the PT7M78xx family of μP supervisory ICs, designed specifically to reduce component count and improve system reliability in embedded microprocessor power-monitoring applications.

FAQ

What is the exact reset threshold voltage for PT7M7823RTAEX?

The nominal reset threshold voltage is 2.63V (VRN), with ±2.5% tolerance over the full operating temperature range (–40°C to +85°C). This value is laser-trimmed during production and specified in the DC Electrical Characteristics table under VRST parameter.

Does PT7M7823RTAEX require an external pull-up resistor on the MR pin?

No. PT7M7823RTAEX includes an internal MR pull-up resistor of 52kΩ (typical), allowing direct connection of a momentary push-button switch between MR and GND without external components. Leaving MR unconnected defaults it to high via the internal resistor.

Can the watchdog timer be disabled, and how?

Yes. The watchdog timer is automatically disabled when the WDI pin is left floating or connected to a high-impedance (three-state) buffer. No external pull-up/down is required - the internal circuitry detects high-Z states and halts watchdog counting.

Is PT7M7823RTAEX pin-compatible with other members of the PT7M78xx family?

Yes, within the same package variant: all TA (SOT23-5) devices share identical pinout (VCC, GND, MR, WDI, RESET). However, functional differences exist - e.g., PT7M7811 lacks WDI, and PT7M7824 adds MR - so electrical and firmware compatibility must be verified per application requirements.