Diodes Incorporated PT7M1818-10TE

Overview

PT7M1818-10TE from Pericom Semiconductor is a precision supervisory circuit designed to monitor V_CC in microprocessor and digital systems, asserting an active-low reset signal when supply voltage drops below 2.9V ±1.5% at 25°C, with 200ms reset timeout, internal 5kΩ pull-up, and bidirectional RST pin for pushbutton integration. It operates across 1.0V–5.5V supply and –40°C to +85°C, enabling reliable power-on reset and brownout protection in space-constrained embedded controllers.

For engineers reviewing the PT7M1818-10TE datasheet, PT7M1818-10TE pinout, PT7M1818-10TE application, or PT7M1818-10TE equivalent, key selection criteria include its fixed 2.9V threshold accuracy, SOT23-3 package footprint, bidirectional reset I/O capability, 12µA quiescent current at 5.5V, and guaranteed 0.4V output low under 8mA load - all critical for low-power, high-reliability µP reset management.

Technical Context

This device implements a single-function voltage supervisor with hysteresis (50mV typical) between V_TH+ and V_TH−, ensuring noise-immune reset assertion and release. Its bidirectional RST pin supports both automatic V_CC-monitored reset and manual external reset initiation via pushbutton, with built-in 20µs sensitivity and 1–2µs pulse detection.

The internal timing circuit guarantees a minimum 140ms and maximum 280ms reset timeout after V_CC recovery, with 200ms nominal duration. Reset remains asserted during V_CC < 1.0V and releases only after V_CC exceeds the 2.9V threshold and the timer expires - no external capacitor or resistor required.

Key Specifications

Pinout & Package

PT7M1818-10TE is housed in a lead-free, RoHS-compliant SOT23-3 plastic package (Package Code: TA3), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and 0.95mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G18DBVR and MAX809SEUR+T, PT7M1818-10TE uniquely combines 2.9V accuracy, SOT23-3 footprint, bidirectional RST, and integrated pull-up - enabling simpler, lower-cost reset architecture where manual reset and minimal component count are priorities.

Availability

PT7M1818-10TE is available at Aetrix Electronics and suitable for industrial PLC controllers, smart meter MCUs, POS terminal baseboards, and IoT edge sensor nodes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for PT7M1818-10TE 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 provider of high-performance interface, timing, and power management ICs, specializing in signal integrity solutions for communications and computing markets.

PT7M1818-10TE belongs to Pericom's supervisory circuit product line, engineered specifically for cost-sensitive, space-constrained microprocessor reset applications demanding precision threshold control and zero-external-component operation.

FAQ

What is the exact reset threshold voltage for PT7M1818-10TE?

The PT7M1818-10TE has a nominal reset threshold voltage (V_TH−) of 2.9V, with ±1.5% accuracy at 25°C and ±2.5% over the full –40°C to +85°C operating range. This value is factory-trimmed and does not require external adjustment.

Can PT7M1818-10TE drive a standard microprocessor reset input directly?

Yes - its open-drain RST output includes an internal 5kΩ pull-up resistor and guarantees ≤0.4V low-level output at 8mA sink current (V_CC = 5V), making it compatible with most µP reset inputs without external components.

Does PT7M1818-10TE support manual reset via pushbutton?

Yes - the RST pin is bidirectional: it functions as both reset output and pushbutton input. When pulled low externally, the device debounces the signal and holds RST low for 200ms after release, eliminating need for external RC networks or logic.

Is PT7M1818-10TE pin-compatible with other parts in the PT7M1818 series?

Yes - all PT7M1818-x variants (e.g., -20TE, -5TE) share identical SOT23-3 pinout (VCC, GND, RST) and electrical interface; only the reset threshold differs (2.5V, 2.9V, or 3.0V), allowing direct substitution where threshold requirements align.