Diodes Incorporated PT7M823SW5-7

Overview

PT7M823SW5-7 from Diodes Incorporated is a precision microprocessor (µP) supervisory circuit in SOT25 package, providing active-low reset assertion during power-up, brownout, and power-down events, 200ms reset pulse width, watchdog timeout of 1.6s, and 2.93V reset threshold voltage for 3.3V systems. It integrates manual reset input, watchdog input, and push-pull RESET output for embedded µP system reliability.

For engineers reviewing the PT7M823SW5-7 datasheet, PT7M823SW5-7 pinout, PT7M823SW5-7 application, or PT7M823SW5-7 equivalent, this device supports critical power-monitoring functions in networking, server/storage, and security systems where guaranteed reset validity down to VCC = 1V and debounced manual reset are required.

Technical Context

The PT7M823SW5-7 implements a precision voltage monitor with ±2% threshold accuracy over -40°C to +85°C and 0.8% hysteresis to prevent chatter during supply transitions. Its internal watchdog timer triggers reset if WDI remains static for ≥1.6s, and clears on any WDI edge or reset assertion.

Reset generation uses an internal timeout circuit ensuring 200ms minimum pulse width after VCC rises above VRST = 2.93V, MR transition, or watchdog timeout. The push-pull RESET output delivers 120µA high-drive capability at VCC ≥ VRST and sinks up to 1.2mA while maintaining VOL ≤ 0.3V at VCC = VRST(MIN).

Key Specifications

Pinout & Package

SOT25 (5-pin SC-74A) surface-mount package with 1.6mm × 2.8mm footprint, 0.65mm lead pitch, and thermal pad-compatible layout per Diodes Inc. outline DWG-002.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809SUT+T and TPS3808G33DBVR, the PT7M823SW5-7 uniquely combines 2.93V threshold, integrated watchdog, debounced MR, and push-pull RESET in one SOT25 package - enabling compact, feature-complete supervision without external components.

Availability

PT7M823SW5-7 is available at Aetrix Electronics and suitable for networking equipment, server/storage controllers, and security system panels requiring stable component supply and long-term industrial lifecycle support.

Supply support for PT7M823SW5-7 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 and computing markets.

The PT7M823/824/825 family targets µP system reliability with integrated voltage monitoring, watchdog, and reset functions - designed specifically for embedded applications where power-supply integrity directly impacts firmware stability.

FAQ

What is the function of the WDI pin on PT7M823SW5-7?

The WDI (Watchdog Input) pin monitors microprocessor activity: if left unconnected or held static for ≥1.6s, it triggers a reset pulse. A rising or falling edge clears the internal watchdog timer. Floating WDI disables the watchdog function entirely, making it optional for designs that rely solely on power-on reset and manual reset.

Can PT7M823SW5-7 operate with a 2.5V supply?

Yes - PT7M823SW5-7 operates from VCC = 1.0V to 5.5V and guarantees RESET output validity down to 1.0V. At 2.5V supply, the 2.93V reset threshold is not asserted, so it cannot supervise 2.5V rails; however, it remains functional as a supervisor for higher rails (e.g., 3.3V) while powered from a separate 2.5V domain if isolation is maintained.

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 during power-up. A low pulse on MR forces reset for ≥200ms after release. MR is debounced with >100ns noise immunity, and its propagation delay to RESET is ≤500ns - ensuring deterministic response to user-initiated resets without spurious triggering.

Is PT7M823SW5-7 compatible with lead-free reflow processes?

Yes - PT7M823SW5-7 is fully RoHS 3 compliant (2015/863/EU), totally lead-free, halogen-free (<900ppm Br, <900ppm Cl, <1000ppm Sb), and qualified for standard Pb-free reflow profiles including JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) at peak temperatures up to 260°C.