Diodes Incorporated PT7M3808G15TAEX

Overview

PT7M3808G15TAEX from Diodes Incorporated is a low-quiescent-current, programmable-delay supervisory IC with 1.5V fixed SENSE threshold (VIT = 1.40V typ), 20ms/300ms selectable reset delay, open-drain RESET output, and manual reset (MR) 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.

For engineers reviewing the PT7M3808G15TAEX datasheet, PT7M3808G15TAEX pinout, PT7M3808G15TAEX application, or PT7M3808G15TAEX equivalent, key selection criteria include VIT tolerance (±1.5% hysteresis), quiescent current (2.8–6.0 µA), CT-pin programmability, MR internal pull-up (90 kΩ), and SOT23-6 thermal pad compatibility.

Technical Context

The PT7M3808G15TAEX implements a precision voltage comparator with 1.40V nominal trip point and 2.5% hysteresis to prevent chatter during threshold crossing. Its reset assertion logic combines negative-going SENSE detection, MR-driven override, and CT-pin configurable timing - supporting both fixed (20ms/300ms) and capacitor-programmable delays (0.75ms–1.7s).

It operates across 1.7–6.5V supply range with ultra-low IDD (≤6.0 µA at 6.5V), open-drain RESET capable of sinking 1.0mA at VDD ≥1.8V, and SENSE input leakage <25nA - enabling direct connection to low-power MCU supply rails without loading.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326T15+T and TPS3808G15DBVR, PT7M3808G15TAEX uniquely combines capacitor-programmable delay (0.75ms–1.7s), integrated MR pull-up, and SOT23-6 thermal pad - offering optimal trade-offs for space-constrained industrial and automotive designs requiring both flexibility and thermal reliability.

Availability

PT7M3808G15TAEX is available at Aetrix Electronics and suitable for industrial PLCs, smart sensor nodes, medical wearables, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS 3-compliant packaging.

Supply support for PT7M3808G15TAEX 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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and automotive markets.

The PT7M3808 series belongs to Diodes' precision supervisory IC product line, designed specifically for robust power-rail monitoring in space- and power-constrained embedded systems with demanding thermal and longevity requirements.

FAQ

What is the exact VIT tolerance and hysteresis for PT7M3808G15TAEX?

The PT7M3808G15TAEX has a guaranteed VIT range of 1.373V to 1.407V at TA = 25°C, with 2.5% hysteresis (VHYS = 2.5% × VIT). This ensures stable reset assertion/deassertion without oscillation during slow-rising or noisy supply transitions, critical for reliable MCU initialization.

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

Yes - leaving the CT pin unconnected (open) configures the device for fixed 20ms reset delay. The datasheet specifies 12–28ms min–max range under recommended operating conditions. No pull-up or pull-down is required; internal circuitry detects open state automatically.

Does PT7M3808G15TAEX support 1.7V minimum VDD operation with full specification compliance?

Yes - all electrical characteristics including VIT accuracy, IDD, and tD are specified down to VDD = 1.7V. At this voltage, RESET sink capability is 0.4mA (not 1.0mA), and VOL remains ≤0.3V, ensuring interoperability with 1.8V logic families even at minimum supply.

Is the thermal pad electrically connected internally?

No - the exposed thermal pad on the SOT23-6 (TA) package is not electrically connected to any internal node. It must be soldered exclusively to the PCB ground plane for thermal conduction and mechanical stability, with no electrical routing or vias required beneath it.