Diodes Incorporated PT7M3808G01ZCEX

Overview

PT7M3808G01ZCEX from Diodes Incorporated is a low-quiescent-current, programmable-delay supervisory IC with adjustable reset threshold (V_IT = 0.405 V) and user-configurable delay via external capacitor (0.75–1.75 ms with 100 pF) or resistor (300 ms). It operates from 1.7 V to 6.5 V, draws only 2.8–5.0 µA supply current, and features open-drain RESET output for microcontroller power-on reset in battery-powered IoT sensors and portable medical devices.

For engineers reviewing the PT7M3808G01ZCEX datasheet, PT7M3808G01ZCEX pinout, PT7M3808G01ZCEX application, or PT7M3808G01ZCEX equivalent, key selection criteria include its ultra-low IDD, CT-pin programmability, SENSE input hysteresis (1.5–3.0% of V_IT), MR manual reset with internal 90 kΩ pull-up, and guaranteed operation from –40°C to +125°C.

Technical Context

The PT7M3808G01ZCEX implements a precision voltage monitor with negative-going threshold detection on the SENSE pin and a configurable reset timeout controlled by the CT pin-supporting fixed delays (20 ms or 300 ms) or capacitor-programmed delays down to sub-millisecond resolution. Its open-drain RESET output drives low during fault conditions and remains asserted until both SENSE exceeds V_IT and MR is high.

Internally, it uses a bandgap-referenced comparator for stable V_IT tracking across temperature and supply voltage, with input bias current as low as ±25 nA at the SENSE pin. The MR input includes Schmitt-trigger logic and an internal 90 kΩ pull-up, enabling reliable manual reset without external components.

Key Specifications

Pinout & Package

TDFN-6 (ZC) package with exposed thermal pad; 2.0 mm × 2.0 mm footprint, 0.5 mm pitch, and integrated ground-connected thermal pad for enhanced thermal dissipation in space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326TUT+T and TPS3808G01DBVR, the PT7M3808G01ZCEX uniquely combines ultra-low IDD, adjustable V_IT, CT-based delay flexibility, and integrated MR pull-up in a compact TDFN-6 package-reducing component count while supporting multi-rail and battery-sensitive designs.

Availability

PT7M3808G01ZCEX is available at Aetrix Electronics and suitable for wearable health monitors, industrial PLC I/O modules, smart meter battery backup circuits, and automotive cabin controllers requiring stable component supply with guaranteed long-term availability.

Supply support for PT7M3808G01ZCEX 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, automotive, and consumer markets.

The PT7M3808 series belongs to Diodes' precision supervisory IC product line, engineered specifically for ultra-low-power, wide-temperature, and multi-threshold voltage monitoring in space- and energy-constrained embedded systems.

FAQ

What is the minimum recommended pull-up resistor value for the RESET pin?

The RESET pin is open-drain and requires an external pull-up resistor. Diodes specifies a range of 10 kΩ to 1 MΩ. For most applications, a 100 kΩ resistor provides optimal noise immunity and rise time while minimizing current draw-especially critical in battery-powered systems where leakage through the pull-up contributes directly to standby power loss.

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

Yes-the datasheet explicitly states that leaving the CT pin open results in a fixed 20 ms reset delay. This configuration requires no external components and is ideal for designs needing a simple, guaranteed minimum reset hold time without capacitor tolerance or temperature drift concerns.

Does the PT7M3808G01ZCEX support monitoring of negative voltages?

No-the SENSE pin is rated for voltages from –0.3 V to +7.0 V, but the device's internal comparator reference is positive-only. The V_IT threshold is defined relative to GND, and the part is designed exclusively for monitoring positive supply rails. Negative voltage monitoring requires a dedicated inverting amplifier stage or alternative supervisor architecture.

How does the internal MR pull-up resistor affect system-level reset timing?

The internal 90 kΩ MR pull-up ensures MR defaults to logic high upon power-up, enabling automatic reset assertion release once VDD stabilizes and SENSE exceeds V_IT. This eliminates race conditions caused by slow-rising external pull-ups and guarantees consistent reset behavior across temperature and voltage-critical for fail-safe boot sequences in safety-critical applications.