Diodes Incorporated PT7M3808G30TAEX

Overview

PT7M3808G30TAEX from Diodes Incorporated is a low-quiescent-current, programmable-delay supervisory IC with fixed 3.0V voltage threshold (VIT = 2.79V typ), 20ms or 300ms selectable reset delay, open-drain RESET output, and manual reset input. It monitors power rails in microcontroller-based systems and asserts reset during brownout or startup. Used in industrial controllers, IoT edge nodes, and battery-powered embedded devices requiring reliable power-on reset and supply supervision.

For engineers reviewing the PT7M3808G30TAEX datasheet, PT7M3808G30TAEX pinout, PT7M3808G30TAEX application, or PT7M3808G30TAEX equivalent, key selection criteria include VIT tolerance (±1.5% hysteresis), ultra-low IDD (2.8–6.0 µA), CT-pin programmability, SOT23-6 thermal pad compatibility, and MR pull-up resistance (90 kΩ).

Technical Context

The PT7M3808G30TAEX implements a precision bandgap-based voltage detector with 2.79V nominal threshold and 1.5–2.5% hysteresis to prevent chatter during slow-rising supply transitions. Its internal comparator drives an open-drain RESET output with VOL ≤ 0.4V at IOL = 1.0mA.

Reset timing is determined by external configuration: CT pin left open yields 20ms delay; tied to VDD via 40–200kΩ resistor yields 300ms delay; connected to ≥100pF capacitor to GND enables user-programmable delays from 0.75ms to 1.7s. MR input provides asynchronous reset override with 90kΩ internal pull-up.

Key Specifications

Pinout & Package

SOT23-6 package with exposed thermal pad (Pin 6 = VDD, Pin 1 = RESET, Pin 2 = GND, Pin 3 = MR, Pin 4 = CT, Pin 5 = SENSE). Thermal pad must be soldered to PCB ground plane for thermal stability and ESD path integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UR30+T and TPS3808G30DBVR, PT7M3808G30TAEX delivers unique CT-pin programmability for delay tuning without extra components, integrated MR pull-up to reduce external parts, and thermal-pad-enhanced reliability - making it optimal for space-constrained, thermally demanding, or field-upgradable designs.

Availability

PT7M3808G30TAEX is available at Aetrix Electronics and suitable for industrial automation, medical wearables, and automotive body electronics requiring stable component supply, RoHS 3 compliance, and long-term lifecycle support.

Supply support for PT7M3808G30TAEX 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 semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and protection applications.

The PT7M3808 series belongs to Diodes' precision supervisory IC product line, designed specifically for high-reliability power sequencing and brownout protection in resource-constrained embedded systems.

FAQ

What is the exact VIT threshold and tolerance for PT7M3808G30TAEX?

The PT7M3808G30TAEX has a nominal VIT of 2.79V with guaranteed min/max range of 2.770V to 2.804V at TA = 25°C. Hysteresis is 1.5–2.5% of VIT, resulting in 41.6–70.1mV of hysteresis voltage, ensuring stable release after supply recovery without oscillation.

Can the CT pin be left floating to achieve the 20ms delay?

Yes - leaving the CT pin unconnected (open) configures the device for its shortest factory-set delay of 20ms (min 12ms, max 28ms). This is explicitly defined in the Electrical Characteristics table and does not require pull-up or pull-down resistors.

Does PT7M3808G30TAEX support operation above 3.3V supply?

Yes - the device operates from 1.7V to 6.5V VDD. At 6.5V, supply current increases to 6.0µA max, and all electrical parameters including VIT, VOL, and tD remain fully specified per datasheet conditions.

Is the thermal pad on the SOT23-6 package electrically connected?

Yes - the exposed thermal pad (PAD) is internally connected to GND and must be soldered to a PCB ground plane. This connection provides both thermal dissipation and an ESD discharge path, improving reliability in harsh environments.