Diodes Incorporated PT7M1233A-15TCEX

Overview

PT7M1233A-15TCEX from Pericom Semiconductor is a bidirectional supervisory circuit that monitors V_CC supply voltage and asserts an active-low reset signal when voltage falls below 2.72 V (±1.5% at 25°C). It features a 200 ms reset timeout, operates from 1.0 V to 5.5 V, and supports pushbutton reset debouncing in microprocessor power-up and brownout protection circuits.

For engineers reviewing the PT7M1233A-15TCEX datasheet, PT7M1233A-15TCEX pinout, PT7M1233A-15TCEX application, or PT7M1233A-15TCEX equivalent, key selection criteria include reset threshold accuracy (±1.5%), bidirectional RST pin functionality, 200 ms timeout stability over -40°C to +85°C, low 10 µA supply current at 3.6 V, and SOT223-3 (TC) package compatibility.

Technical Context

The PT7M1233A-15TCEX implements a precision bandgap-based voltage reference and comparator with hysteresis (50 mV typical) to detect V_CC drops below 2.72 V. Its internal timing delay ensures reset remains asserted for ≥200 ms after V_CC recovers above threshold.

As a bidirectional supervisory device, it continuously monitors the RST pin for external pull-down events (e.g., pushbutton closure), debounces inputs with 140–280 ms window, and generates a clean 200 ms reset pulse upon release-enabling single-pin system reset initiation without external RC networks.

Key Specifications

Pinout & Package

PT7M1233A-15TCEX is packaged in a lead-free, RoHS-compliant SOT223-3 (package code TC) with thermal pad exposed on underside for enhanced power dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326–272 and TPS3808G15, PT7M1233A-15TCEX uniquely integrates bidirectional RST functionality-reducing component count by one IC and eliminating layout-sensitive RC networks-while maintaining identical threshold and timeout specs for drop-in replacement in brownout-only use cases.

Availability

PT7M1233A-15TCEX is available at Aetrix Electronics and suitable for industrial control systems, smart metering platforms, and automotive body electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for PT7M1233A-15TCEX 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

Pericom Semiconductor (now part of Diodes Incorporated) specializes in high-performance interface, timing, and power management ICs for communications, computing, and industrial markets.

The PT7M1233A series belongs to Pericom's supervisory circuit product line, designed specifically for cost-sensitive, space-constrained embedded systems requiring precise voltage monitoring and integrated manual reset capability.

FAQ

What is the function of the bidirectional RST pin?

The RST pin serves dual roles: it outputs an active-low reset signal during V_CC brownout, and accepts external pull-down (e.g., pushbutton) to initiate a hardware reset. Internal debounce logic ensures clean 200 ms pulse generation upon button release, eliminating firmware or external circuit dependencies.

Does PT7M1233A-15TCEX require external components for basic operation?

No external components are required for core supervision functionality. The device integrates precision reference, comparator, timer, and pushbutton debounce logic. Only V_CC, GND, and RST connections are needed-no pull-up resistors, capacitors, or diodes are mandatory for standard reset assertion or manual reset initiation.

How does temperature affect the reset threshold accuracy?

Over -40°C to +85°C, the reset threshold drift is ±2.5% × typical value (2.72 V), resulting in a guaranteed operating window of 2.65 V to 2.79 V. This is specified in the datasheet's DC Electrical Characteristics table and validated across full temperature range-not extrapolated or estimated.

Can PT7M1233A-15TCEX monitor multiple supply rails simultaneously?

No-it monitors only a single V_CC rail. For multi-rail systems, separate PT7M1233A-15TCEX devices are required per monitored voltage domain. Each unit operates independently and can drive its own reset net or share RST via wired-OR configuration with appropriate pull-up sizing.