Diodes Incorporated PT7M3808G01TAEX

Overview

PT7M3808G01TAEX from Diodes Incorporated is a low-quiescent-current, programmable-delay supervisory IC with adjustable voltage threshold (V_IT = 0.405 V), 20 ms fixed or 300 ms resistor-programmable reset delay, open-drain RESET output, and SOT23-6 package. It monitors supply rails in microcontroller-based systems, asserts reset during brownout or power-up, and supports manual reset via MR pin. Used in battery-powered IoT sensors and industrial controllers requiring reliable power sequencing.

For engineers reviewing the PT7M3808G01TAEX datasheet, PT7M3808G01TAEX pinout, PT7M3808G01TAEX application, or PT7M3808G01TAEX equivalent, key selection criteria include V_IT tolerance (±1.5% hysteresis), ultra-low IDD (2.8 µA typ. at 3.3 V), CT-pin programmability, open-drain drive capability (1 mA sink), and -40°C to +125°C operation.

Technical Context

The PT7M3808G01TAEX implements a precision bandgap-based voltage comparator for SENSE input monitoring, with internal hysteresis (1.5–3.0% of V_IT) to prevent chatter near threshold. Its reset assertion logic combines negative-going SENSE detection, MR-driven override, and CT-configurable timing-enabling both fixed (20/300 ms) and capacitor-programmed delays (0.75 ms to 1.7 s).

It features an internally pulled-up MR pin (90 kΩ), open-drain RESET output compatible with voltages up to 7.0 V (independent of V_DD), and operates across 1.7–6.5 V supply range. The CT pin accepts resistor-to-V_DD (40–200 kΩ) or capacitor-to-GND (≥100 pF) configurations, with no external clock or digital interface required.

Key Specifications

Pinout & Package

SOT23-6 package with exposed thermal pad (connected to GND); 1.6 mm × 2.9 mm footprint, 1.1 mm height; RoHS-compliant, halogen- and antimony-free "Green" construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2T and TPS3808G01QDBVRQ1, the PT7M3808G01TAEX uniquely combines adjustable V_IT, dual-mode (fixed/programmable) delay, and ultra-low I_DD in a single SOT23-6 device-making it optimal for cost-sensitive, battery-operated, and multi-rail embedded systems where flexibility and longevity are critical.

Availability

PT7M3808G01TAEX is available at Aetrix Electronics and suitable for battery-powered IoT sensors, industrial PLC controllers, automotive body electronics, and medical wearables requiring stable component supply and long-term lifecycle assurance.

Supply support for PT7M3808G01TAEX 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 solutions, with design, manufacturing, and distribution operations across Asia, Europe, and the Americas.

The PT7M3808 series belongs to Diodes' precision power-supervision product line, engineered for ultra-low-power, high-accuracy reset generation in space- and energy-constrained embedded systems.

FAQ

What is the minimum V_DD required for valid RESET assertion?

The PT7M3808G01TAEX guarantees proper reset functionality down to V_DD = 1.7 V. Below this, the internal bandgap reference and comparator may not operate reliably. The POR (power-on reset) voltage is specified at 1.0 V, meaning RESET remains asserted until V_DD rises above that level and stabilizes.

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

Yes. Leaving the CT pin unconnected (open) configures the device for its shortest fixed delay of 20 ms. This is explicitly defined in the datasheet's Electrical Characteristics table under t_D (RESET delay time) with "CT = open" condition. No pull-up or pull-down is required.

Does the SENSE pin draw significant current during monitoring?

No. Input current at the SENSE pin is only ±25 nA (typ.) when V_SENSE = V_IT − 25 mV, per the datasheet's I_SENSE specification. This ultra-low leakage ensures minimal loading on precision voltage dividers or low-power supply rails.

Is the thermal pad (exposed paddle) electrically connected internally?

No. The thermal pad in the SOT23-6 (TA) package is not internally connected to any die node. It must be externally soldered to a PCB ground plane solely for thermal conduction-not for electrical reference or signal integrity.