Diodes Incorporated PT7M3808G15ZCEX

Overview

PT7M3808G15ZCEX from Diodes Incorporated is a low-quiescent-current, programmable-delay supervisory IC with fixed 1.5V supply voltage monitoring threshold (V_IT = 1.40 V), open-drain RESET output, manual reset input (MR), and CT pin for delay configuration via external capacitor or resistor. It operates from 1.7V to 6.5V, draws only 5.0 µA typical supply current at 3.3V, and supports industrial temperature range (–40°C to +125°C). Used in microcontroller power-on reset sequencing for embedded control systems.

For engineers reviewing the PT7M3808G15ZCEX datasheet, PT7M3808G15ZCEX pinout, PT7M3808G15ZCEX application, or PT7M3808G15ZCEX equivalent, key selection criteria include V_IT accuracy (±2.5% over temperature), programmable delay resolution (0.75–1.75 ms with 100 pF), MR internal pull-up (90 kΩ), and TDFN-6 thermal pad grounding requirement.

Technical Context

The PT7M3808G15ZCEX implements a precision bandgap-based voltage comparator with hysteresis (2.5% of V_IT) to detect SENSE voltage drops below 1.40 V, triggering an open-drain RESET assertion. Its CT pin enables flexible delay programming: open-circuit yields 20 ms fixed delay; resistor-to-VDD yields 300 ms; capacitor-to-GND enables user-defined delays from sub-millisecond to ~1.7 s.

RESET propagation delay is 20 µs from SENSE threshold crossing and 150 ns from MR assertion. The device features internal MR pull-up (90 kΩ), low-input-bias SENSE current (±25 nA), and guaranteed operation down to 1.7 V supply-enabling reliable reset generation even during brown-out conditions in battery-powered systems.

Key Specifications

Pinout & Package

TDFN-6 (ZC) package with 0.5 mm pitch, 2.0 mm × 2.0 mm body, and exposed thermal pad (Pin 7) requiring direct solder connection to PCB ground plane for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326T15+T and TPS3808G15DBVR, PT7M3808G15ZCEX uniquely combines CT-capacitor programmability, integrated MR pull-up, and 5 µA quiescent current in a thermally enhanced TDFN-6 package-making it optimal for compact, thermally constrained, and functionally flexible reset designs.

Availability

PT7M3808G15ZCEX is available at Aetrix Electronics and suitable for microcontroller power-on reset, industrial sensor node supervision, and automotive body control module applications requiring stable component supply, RoHS 3 compliance, and thermal performance up to +125°C ambient.

Supply support for PT7M3808G15ZCEX 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, with design centers in Asia, Europe, and the U.S., and manufacturing facilities certified to ISO 9001 and IATF 16949 standards.

The PT7M3808 series belongs to Diodes' precision voltage supervisor product line, engineered for reliable power-on reset and brown-out detection in space- and power-constrained embedded systems across industrial, automotive, and consumer markets.

FAQ

What is the exact V_IT threshold for PT7M3808G15ZCEX and how tightly is it specified?

The PT7M3808G15ZCEX has a nominal V_IT of 1.40 V, with a guaranteed range of 1.373 V to 1.407 V (±2.5%) across –40°C to +125°C and 1.7–6.5 V supply. This specification is measured per Diodes DS43298 Rev 8-2, Table 1, and applies to the G15 variant specifically - not interpolated from other part numbers.

Can the CT pin be left floating, and what delay results?

No - the CT pin must not be left floating. Per datasheet Section "Pin Description", CT = open yields a fixed 20 ms delay, while CT = VDD via 40–200 kΩ yields 300 ms. Floating CT introduces undefined behavior and violates recommended operation; it must be either open, resistor-connected to VDD, or capacitor-connected to GND.

Does PT7M3808G15ZCEX require an external pull-up on the RESET pin, and what value is recommended?

Yes - RESET is open-drain and requires an external pull-up resistor. The datasheet specifies a range of 10 kΩ to 1 MΩ. A 100 kΩ resistor is commonly used to balance speed (rise time) and power consumption, especially when pulling up to a voltage higher than VDD (e.g., 3.3V while VDD = 1.8V).

How is thermal performance managed in the TDFN-6 (ZC) package?

Thermal performance relies on soldering the exposed thermal pad (Pin 7) directly to a PCB ground plane. Diodes specifies this pad as mandatory for achieving rated junction temperature limits. Without proper thermal pad connection, θ_JA increases significantly, risking thermal shutdown or parametric drift above 85°C ambient.