Diodes Incorporated PT7M823ZSE-7

Overview

PT7M823ZSE-7 from Diodes Incorporated is a precision microprocessor (µP) supervisory circuit in SOT353 package, providing active-low reset assertion during power-up, brownout, and power-down events, 200ms reset pulse width, watchdog timeout of 1.6s, and 2.32V reset threshold voltage. It integrates manual reset input, push-pull RESET output, and VCC monitoring for low-battery warning in embedded µP systems.

For engineers reviewing the PT7M823ZSE-7 datasheet, PT7M823ZSE-7 pinout, PT7M823ZSE-7 application, or PT7M823ZSE-7 equivalent, this device supports reliable system initialization, fault recovery, and supply integrity monitoring in space-constrained industrial and networking equipment where guaranteed reset validity down to VCC = 1.0V and ±2% threshold accuracy across –40°C to +85°C are required.

Technical Context

The PT7M823ZSE-7 implements a precision bandgap-based voltage monitor with 2.32V nominal reset threshold (VRN), ±2% tolerance over temperature, and 0.8% hysteresis to prevent chatter during supply transitions. Its internal timer ensures a guaranteed 200ms (typ) reset pulse after VCC rises above VRST or MR release.

It features a dedicated debounced CMOS-compatible manual-reset input (MR) with internal 52kΩ pull-up and a watchdog input (WDI) that triggers reset if left static for >1.6s (typ); WDI edge detection accepts pulses as short as 150ns. The push-pull RESET output sinks up to 1.2mA at VCC = VRST(MIN) and sources 150µA at VCC > 1.8V.

Key Specifications

Pinout & Package

SOT353 (5-pin, 1.25mm × 2.1mm × 0.95mm) surface-mount package with gull-wing leads, RoHS-compliant and halogen-free construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326–232 and TPS3808G12, the PT7M823ZSE-7 delivers integrated watchdog and manual reset in a single SOT353 package with lower quiescent current and push-pull output - reducing component count and simplifying design for compact, self-recovering µP systems.

Availability

PT7M823ZSE-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, network router management units, and server baseboard management controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for PT7M823ZSE-7 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 communications markets.

The PT7M823ZSE-7 belongs to Diodes' µP supervisor product line, designed specifically to replace discrete reset circuits in space-constrained embedded systems while delivering precision voltage monitoring, watchdog supervision, and manual reset capability in a single chip.

FAQ

What is the function of the WDI pin on PT7M823ZSE-7?

The WDI (Watchdog Input) pin monitors microprocessor activity: if WDI remains static (high or low) for longer than 1.6s (typ), the device asserts RESET to recover from software lockup. A rising or falling edge clears the internal watchdog timer. Leaving WDI unconnected or connecting it to a high-impedance buffer disables the watchdog function entirely.

Can PT7M823ZSE-7 operate reliably below 2.32V?

Yes - PT7M823ZSE-7 guarantees RESET output validity down to VCC = 1.0V, and its internal circuitry remains functional across the full 1.0V–5.5V supply range. However, reset assertion occurs only when VCC falls below the 2.32V threshold; operation below 1.0V is not specified and may result in undefined behavior.

How does the manual reset (MR) input behave during power-up?

The MR input has an internal 52kΩ pull-up resistor, so it defaults high when unconnected. During power-up, if MR is held low (e.g., by a pressed button), RESET asserts immediately and remains low for ≥200ms after MR returns high. MR can be used independently of power sequencing - it functions correctly even when VCC is as low as 1.0V.

Is PT7M823ZSE-7 compatible with 1.8V I/O systems?

Yes - the PT7M823ZSE-7's RESET output is push-pull and specified to drive high to 0.8×VCC when VCC > 1.8V (ISOURCE = 150µA), ensuring compatibility with 1.8V logic thresholds. Input thresholds (VIH/VIL) scale with VCC, and MR/WDI accept standard CMOS levels across the full 1.0V–5.5V operating range.