Diodes Incorporated PT7M1233A-10TCEX

Overview

PT7M1233A-10TCEX from Pericom Semiconductor is a precision voltage supervisor IC designed to monitor V_CC in microprocessor and digital systems, asserting an active-low reset signal when supply voltage drops below 2.88 V (±1.5% at 25°C), with ±2.5% temperature drift over –40°C to +85°C, 200 ms reset timeout, and bidirectional RST pin for pushbutton integration in embedded power-up/power-down sequencing.

For engineers reviewing the PT7M1233A-10TCEX datasheet, PT7M1233A-10TCEX pinout, PT7M1233A-10TCEX application, or PT7M1233A-10TCEX equivalent, key selection criteria include reset threshold accuracy, bidirectional reset I/O capability, low quiescent current (10 µA at 3.6 V), SOT223-3 package compatibility, and pushbutton debounce timing alignment with µP boot requirements.

Technical Context

The PT7M1233A-10TCEX implements a precision bandgap reference and comparator-based voltage monitor with hysteresis (50 mV typical) to prevent oscillation during brownout transitions. Its internal timing delay ensures a guaranteed 140–280 ms reset assertion window after V_CC recovery.

As a bidirectional supervisory device, it supports both automatic power-fail detection and manual reset initiation via the RST pin: it detects external pull-down events (≥0.8 V threshold), debounces switch closures, and generates a clean 200 ms reset pulse upon release-enabling single-pin system-level reset control without external RC networks.

Key Specifications

Pinout & Package

PT7M1233A-10TCEX is housed in a lead-free, RoHS-compliant SOT223-3 (package code TC3) surface-mount package 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 voltage supervisor applications.

Compared with MAX809SEUR+T and TPS3808G12DBVR, PT7M1233A-10TCEX uniquely integrates precise 2.88 V supervision with native pushbutton support in a 3-pin SOT223, eliminating external passives while maintaining industrial temperature performance and sub-10 µA quiescent draw.

Availability

PT7M1233A-10TCEX is available at Aetrix Electronics and suitable for industrial PLC controllers, smart metering systems, medical handheld diagnostics, and automotive body control modules requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.

Supply support for PT7M1233A-10TCEX 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) is a fabless analog and mixed-signal IC designer specializing in high-reliability interface, timing, and power management solutions for communications, computing, and industrial markets.

The PT7M1233A series belongs to Pericom's supervisory IC product line, engineered specifically for cost-sensitive, space-constrained embedded systems needing accurate, low-power, and feature-integrated power monitoring without external components.

FAQ

What is the exact reset threshold voltage for PT7M1233A-10TCEX at 25°C?

The PT7M1233A-10TCEX has a nominal reset threshold voltage of 2.88 V at 25°C, with a guaranteed tolerance of ±1.5% (2.837 V to 2.923 V). This value is factory-trimmed and specified in the DC Electrical Characteristics table of the official datasheet (Rev. PT0195-4, June 2013).

Does PT7M1233A-10TCEX require an external pull-up resistor on the RST pin?

No - the RST pin is an open-drain output with internal weak pull-down during reset assertion, but it does not include an internal pull-up. An external pull-up resistor (typically 10–100 kΩ to V_CC) is required for proper logic-high idle state and pushbutton interface functionality, as confirmed in the Typical Operation Circuit diagram (Page 5) and Pin Description section.

Can PT7M1233A-10TCEX be used with a 1.8 V supply rail?

Yes - the device operates across 1.0 V to 5.5 V, and its 2.88 V reset threshold remains valid down to V_CC = 1.0 V. However, at 1.8 V supply, the RST output low voltage (V_OL) is specified at 0.09 V with –50 µA sink current, confirming functional compatibility with 1.8 V logic interfaces when properly biased.

How does the pushbutton debounce function work on the RST pin?

When the RST pin is externally pulled low (e.g., by a momentary switch), the device detects the edge, debounces the signal over 140–280 ms, and asserts an internal reset. Upon switch release, it holds RST low for exactly 200 ms - matching the power-up timeout - ensuring a clean, standardized reset pulse regardless of button press duration.