Diodes Incorporated PT7M3808G25TAEX

Overview

PT7M3808G25TAEX from Diodes Incorporated is a low-quiescent-current, programmable-delay supervisory IC with fixed 2.5V supply monitoring threshold (VIT = 2.33V 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 2.8–6.0µA supply current, 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 PT7M3808G25TAEX datasheet, PT7M3808G25TAEX pinout, PT7M3808G25TAEX application, or PT7M3808G25TAEX equivalent, key selection criteria include its 2.33V VIT tolerance (±3%), 20/300ms fixed delay options, SOT23-6 package footprint, open-drain RESET drive capability (1.0mA sink), and MR internal 90kΩ pull-up - all critical for reliable system initialization in space-constrained embedded designs.

Technical Context

The PT7M3808G25TAEX implements a precision voltage monitor with hysteresis (2.5% of VIT) to prevent oscillation during slow-rising or noisy supply transitions. Its SENSE pin compares monitored voltage against a trimmed bandgap reference, triggering an open-drain RESET assertion when VSENSE falls below VIT.

Delay timing is determined by the CT pin configuration: open-circuit yields 20ms, connected to VDD via 40–200kΩ yields 300ms, and connection to ground via ≥100pF capacitor enables programmable delays from 0.75ms to >1s. The MR input provides asynchronous reset override with internal 90kΩ pull-up.

Key Specifications

Pinout & Package

SOT23-6 package (TA code) with exposed thermal pad (connected to GND for improved thermal performance). Pin 1 marked by dot; pinout compatible with standard SOT23-6 footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326T25D2+T and TPS3808G25DBVR, the PT7M3808G25TAEX uniquely combines 20ms/300ms dual fixed delays, CT-programmability, internal MR pull-up, and sub-3µA IQ - making it optimal for cost-sensitive, flexible-timing industrial controllers where board space and BOM count are constrained.

Availability

PT7M3808G25TAEX is available at Aetrix Electronics and suitable for industrial PLC I/O modules, medical patient monitors, and automotive body control units requiring stable component supply and RoHS-compliant packaging.

Supply support for PT7M3808G25TAEX 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 integrated circuits, specializing in high-performance, energy-efficient components for industrial, computing, and automotive markets.

The PT7M3808 series belongs to Diodes' precision supervisory IC product line, designed specifically for reliable power-on reset and undervoltage protection in space-constrained, low-power embedded systems operating across extended temperature ranges.

FAQ

What is the exact VIT tolerance for PT7M3808G25TAEX?

The VIT threshold is specified as 2.308V (min) to 2.342V (max) at TA = 25°C, corresponding to ±1.5% of the nominal 2.33V value. This tolerance remains stable over −40°C to +125°C operating temperature range per the datasheet's electrical characteristics table.

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

Yes - leaving the CT pin unconnected (open) configures the device for 20ms reset delay, as confirmed in the Pin Description table and Timing Diagram section. Floating CT is electrically equivalent to open-circuit; no pull-up or pull-down is required or recommended.

Is the thermal pad on PT7M3808G25TAEX required to be grounded?

Yes - the exposed thermal pad must be soldered to a PCB ground plane to ensure proper thermal dissipation and meet the rated junction temperature specification (−40°C to +125°C). Diodes' mechanical drawings and layout guidelines explicitly require thermal pad grounding for reliability.

Does PT7M3808G25TAEX support 1.8V supply operation?

Yes - the device operates from 1.7V to 6.5V VDD. At 1.8V, VOL is guaranteed ≤0.3V with 0.4mA sink current, and VIT remains 2.33V, enabling monitoring of higher rails (e.g., 2.5V) even when powered from a lower 1.8V domain, provided SENSE voltage exceeds VIT.