Diodes Incorporated PT7M7811TTBEX-1516

Overview

PT7M7811TTBEX-1516 from Diodes Incorporated is a precision microprocessor supervisory IC with 2.93V reset threshold, push-pull active-low RESET output, manual-reset input (MR), and watchdog timer input (WDI). It asserts reset during power-up, brownout, or manual trigger, guarantees RESET validity down to VCC = 1.0V, and delivers 200ms reset pulse width. Used in embedded systems requiring reliable power monitoring and system recovery.

For engineers reviewing the PT7M7811TTBEX-1516 datasheet, PT7M7811TTBEX-1516 pinout, PT7M7811TTBEX-1516 application, or PT7M7811TTBEX-1516 equivalent, key selection criteria include reset threshold accuracy (±2.5% over -40°C to +85°C), MR internal pull-up (10–40 kΩ), watchdog timeout (1.12–2.25 s), guaranteed operation at 1.0V supply, and SOT143-4 package compatibility.

Technical Context

The PT7M7811TTBEX-1516 integrates a precision voltage monitor, debounced CMOS-compatible manual-reset circuit, and watchdog timer with 150ns minimum WDI pulse detection. Its reset generator uses an internal timebase to ensure 200ms reset assertion after VCC rise above 2.93V, MR release, or watchdog timeout.

It supports dual reset signaling: active-low push-pull RESET and its active-high inverse (RESET), both valid down to VCC = 1.0V. The device features no external components required for basic supervision and includes hysteresis (4 mV typical for T/S/R/K variants) to prevent chatter near threshold.

Key Specifications

Pinout & Package

PT7M7811TTBEX-1516 is housed in a 4-pin SOT143 (TB) plastic surface-mount package, optimized for space-constrained PCB layouts and automated assembly. Pin 1 is MR, Pin 2 is VCC, Pin 3 is GND, and Pin 4 is RESET.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX811T24-1516 and TPS3808G125DBVR, PT7M7811TTBEX-1516 uniquely combines fixed 2.93V threshold, integrated WDI+MR, push-pull RESET, and 1.0V operational floor in a 4-pin SOT143-making it optimal for compact, feature-complete µP supervision where reliability under brownout and field serviceability matter.

Availability

PT7M7811TTBEX-1516 is available at Aetrix Electronics and suitable for industrial PLC controllers, network infrastructure equipment, medical infusion pumps, and automotive telematics modules requiring stable component supply and long-term design-in support.

Supply support for PT7M7811TTBEX-1516 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 PT7M78xx family targets µP system reliability enhancement through integrated voltage monitoring, watchdog, and manual reset functions-designed specifically for embedded systems where deterministic power-up sequencing and fault recovery are critical.

FAQ

What is the minimum supply voltage at which PT7M7811TTBEX-1516 guarantees RESET output validity?

PT7M7811TTBEX-1516 guarantees RESET and RESET outputs remain valid down to VCC = 1.0V, as confirmed in the Functional Description and DC Electrical Characteristics sections. This ensures reliable reset assertion during deep brownout conditions before complete power loss, supporting safe MCU shutdown sequences in battery-backed or low-voltage systems.

Does PT7M7811TTBEX-1516 require external components for basic reset functionality?

No external components are required for basic reset operation. The device integrates an internal MR pull-up resistor (10–40 kΩ), fixed 200ms reset timeout, and push-pull RESET output. Only VCC, GND, MR (optional), and RESET connections are needed-eliminating external RC networks, pull-ups, or timing capacitors typically used in discrete supervisor designs.

How does the watchdog timer respond to WDI signal transitions?

The watchdog timer clears on every rising or falling edge of WDI and triggers reset if WDI remains static (high or low) for ≥1.6s (typical). Pulses as short as 150ns are detectable. Leaving WDI floating or connecting it to a high-impedance buffer disables the watchdog-no external pull-up/down is needed for disable mode.

Is PT7M7811TTBEX-1516 qualified for automotive applications?

PT7M7811TTBEX-1516 is not pre-qualified to AEC-Q100. Diodes states that automotive-grade versions require specific change control, PPAP capability, and IATF 16949 manufacturing-contacting Diodes or an authorized representative is necessary to obtain qualified variants. This part is intended for industrial and commercial applications per its datasheet specifications.