Diodes Incorporated PT7M3808G33TAEX

Overview

PT7M3808G33TAEX from Diodes Incorporated is a low-quiescent-current, programmable-delay supervisory IC with fixed 3.3V supply monitoring threshold (V_IT = 3.07V typ), open-drain RESET output, manual reset input (MR), and CT pin for delay configuration. It operates from 1.7V to 6.5V, draws only 5.0µA at 3.3V, and supports 20ms or 300ms fixed delays or user-programmable delays via external capacitor. It is used in microcontroller power-up sequencing and brown-out detection in industrial control modules.

For engineers reviewing the PT7M3808G33TAEX datasheet, PT7M3808G33TAEX pinout, PT7M3808G33TAEX application, or PT7M3808G33TAEX equivalent, key selection criteria include V_IT accuracy (±1.5% over temperature), CT-programmable delay range (0.75ms–1.7s), MR internal 90kΩ pull-up, open-drain RESET drive capability, and SOT23-6 thermal pad compatibility.

Technical Context

The PT7M3808G33TAEX implements a precision voltage monitor with hysteresis (2.5% of V_IT) and a programmable reset timer using an internal RC oscillator referenced to the CT pin. Its SENSE input compares monitored voltage against a trimmed bandgap-based threshold, while the RESET output remains asserted until both SENSE exceeds V_IT and MR is high for the full delay period.

It features a dedicated manual reset input with internal 90kΩ pull-up, enabling system-level reset initiation independent of supply voltage monitoring. The open-drain RESET output supports voltage translation up to 7.0V and requires an external pull-up resistor (10kΩ–1MΩ) to interface with diverse logic families.

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 connected to PCB ground plane for thermal stability and ESD robustness.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326T33D2+T and TPS3808G33DBVR, PT7M3808G33TAEX uniquely combines programmable delay (via CT), internal MR pull-up, and 5.0µA quiescent current in SOT23-6 - offering optimal balance of timing flexibility, BOM reduction, and power efficiency for industrial embedded systems.

Availability

PT7M3808G33TAEX is available at Aetrix Electronics and suitable for industrial PLC I/O modules, smart meter power sequencing, and medical sensor nodes requiring stable component supply, long-term lifecycle support, and RoHS 3-compliant packaging.

Supply support for PT7M3808G33TAEX 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 consumer markets.

The PT7M3808 series belongs to Diodes' precision supervisory IC product line, designed specifically for low-power, high-accuracy voltage monitoring and reset generation in space-constrained embedded systems operating across extended temperature ranges.

FAQ

What is the exact V_IT tolerance for PT7M3808G33TAEX over temperature?

The PT7M3808G33TAEX has a V_IT of 3.055V (min) to 3.085V (max) at +25°C, with guaranteed ±1.5% variation over the full -40°C to +125°C operating junction temperature range. This specification is verified per DS43298 Rev 8-2, Electrical Characteristics table, row "V_IT Negative-going input threshold PT7M3808G33".

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

Yes - leaving the CT pin unconnected (open) configures the device for a nominal 20ms reset delay, with guaranteed range of 12ms to 28ms over temperature and supply voltage. This mode requires no external components and is explicitly defined in the "RESET delay time" parameter table on page 5 of DS43298 Rev 8-2.

Does PT7M3808G33TAEX support operation below 1.7V?

No - the absolute minimum V_DD is 1.7V as specified in the Recommended Operating Conditions table. Operation below this voltage may result in undefined behavior, including failure to assert RESET or incorrect V_IT comparison. The device is not characterized or guaranteed for sub-1.7V operation.

Is the thermal pad electrically connected internally?

Yes - the exposed thermal pad (PAD) is internally connected to GND, as confirmed in the Pin Description table on page 3 of DS43298 Rev 8-2. It must be soldered to a PCB ground plane for thermal performance and ESD robustness; floating or unconnected pads degrade reliability and violate recommended layout guidelines.