Diodes Incorporated PT7M1818-10TEX

Overview

PT7M1818-10TEX from Pericom Semiconductor is a highly accurate supervisory circuit designed to monitor V_CC in microprocessor and digital systems, asserting an active-low reset when supply voltage drops below 2.9 V (±1.5% at 25°C), with 200 ms reset timeout, 1.0–5.5 V operating range, and SOT-23-3 package for space-constrained embedded control applications.

For engineers reviewing the PT7M1818-10TEX datasheet, PT7M1818-10TEX pinout, PT7M1818-10TEX application, or PT7M1818-10TEX equivalent, this device delivers precise brownout detection, bidirectional RST pin support for pushbutton integration, low quiescent current (10 µA at 3.6 V), and internal 5 kΩ pull-up-critical for reliable power-on reset sequencing in industrial controllers and battery-powered IoT nodes.

Technical Context

The PT7M1818-10TEX implements a precision voltage threshold detector with hysteresis (50 mV typical) to prevent oscillation during slow V_CC transitions, and integrates a monostable timer that guarantees 200 ms minimum reset assertion after V_CC recovery above V_TH− = 2.9 V. Its bidirectional RST pin supports both automatic reset generation and external manual reset initiation via pushbutton.

It operates across −40°C to +85°C with ±2.5% temperature coefficient on detection threshold and maintains output low-state integrity down to V_CC = 1.0 V, ensuring robust reset behavior during deep brownout or battery sag conditions in portable and automotive subsystems.

Key Specifications

Pinout & Package

SOT-23-3 plastic surface-mount package (3-pin small-outline transistor), 1.05–1.25 mm height, 2.82–3.02 mm body length, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809SEUR+T and TPS3808G12DBVR, the PT7M1818-10TEX uniquely combines factory-trimmed 2.9 V accuracy, integrated 5 kΩ pull-up, and true bidirectional RST-reducing component count and enabling direct pushbutton integration without external passives.

Availability

PT7M1818-10TEX is available at Aetrix Electronics and suitable for industrial PLC controllers, smart metering units, automotive body control modules, and IoT edge sensor nodes requiring stable component supply and long-term manufacturability.

Supply support for PT7M1818-10TEX 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 semiconductor company specializing in high-performance interface, timing, and power management solutions for communications, computing, and industrial markets.

The PT7M1818 series belongs to Pericom's supervisory circuit product line, engineered specifically for cost-sensitive, space-constrained embedded systems needing accurate, low-power, and pushbutton-capable reset supervision.

FAQ

What is the exact reset threshold voltage and its tolerance for PT7M1818-10TEX?

The PT7M1818-10TEX has a factory-trimmed reset threshold voltage (V_TH−) of 2.9 V with ±1.5% tolerance at 25°C, and ±2.5% variation over the full −40°C to +85°C operating temperature range. This specification is verified per the DC Electrical Characteristics table in the official datasheet revision PT0190-7.

Does PT7M1818-10TEX require an external pull-up resistor on the RST pin?

No. The PT7M1818-10TEX integrates a 5 kΩ internal pull-up resistor on the RST pin, confirmed by the "Efficient open-drain output with internal 5kΩ pull-up resistor" feature and Rp = 3.75–6.25 kΩ specification in the datasheet. External pull-up is unnecessary unless higher drive strength or different voltage level translation is required.

Can PT7M1818-10TEX be used with a 1.8 V microcontroller supply rail?

Yes. The device operates down to V_CC = 1.0 V and maintains valid reset assertion (V_OL ≤ 0.3 V at 4 mA) even at 1.8 V supply. Its 2.9 V threshold remains functional as long as V_CC ≥ 2.9 V during normal operation; for sub-2.9 V rails, it serves as undervoltage lockout (UVLO) before power-up.

How does the bidirectional RST pin function during manual reset initiation?

When not in automatic reset, the PT7M1818-10TEX continuously monitors RST for a falling edge. Upon detecting a pull-down (e.g., via pushbutton), it debounces the signal and forces RST low for 200 ms after release, as specified in the AC Electrical Characteristics table (t_PD = 1 µs, t_RS = 200 ms). This eliminates need for external RC debounce networks.